KR102153448B1 - Apparatus for wideband lossless partial discharge detection and noise suppression - Google Patents

Abstract

The present invention relates to a broadband lossless partial discharge detection and noise removal device, and a partial discharge generation timing pulse acquisition unit for acquiring the generation timing pulse of the partial discharge signal at the beginning of the partial discharge signal generation, and a partial discharge generation timing pulse acquisition unit for acquiring the magnitude pulse of the partial discharge signal. A partial discharge magnitude pulse acquisition unit, a synchronization comparator for detecting a partial discharge pulse determined according to synchronization between the generation timing pulse of the partial discharge signal and the magnitude pulse, and partial discharge through the detected partial discharge pulse And a partial discharge signal generator for generating a signal. Accordingly, the present invention applies a pulse synchronization technique to detect a broadband partial discharge signal without loss, so that the partial discharge generation timing pulse (T-Pulse) and the partial discharge magnitude pulse (Q-Pulse) start each other are the partial discharge signals. It is possible to effectively detect a partial discharge signal over a wide band without loss from an input signal in which the partial discharge signal and noise are mixed by detecting the two pulses with each other and removing the pulses that are not started with each other or, in some cases, with noise.

Description

Broadband lossless partial discharge detection and noise removal device {APPARATUS FOR WIDEBAND LOSSLESS PARTIAL DISCHARGE DETECTION AND NOISE SUPPRESSION}

The present invention relates to a broadband lossless partial discharge detection and noise removal technology, and more particularly, a partial discharge generation timing pulse (T-Pulse) and a partial discharge amplitude by applying a pulse synchronization technique to detect a broadband partial discharge signal without loss. The pulses in which the pulses (Q-Pulse) are started with each other are detected as a partial discharge signal, and the pulses in which the two pulses are not started together are removed as noise. It is a pulse-converted wideband lossless partial discharge detection and noise removal device that effectively detects signals.

Partial discharge diagnosis technology is used for preventive diagnosis of electric equipment in the field of electric power equipment and electric vehicles. In general, partial discharge diagnosis technology corresponds to a non-destructive diagnosis technology that detects electromagnetic waves, ultrasonic waves, light, or vibration generated inside electrical equipment to prevent and diagnose partial discharge in advance.

The conventional partial discharge diagnosis technology using electromagnetic waves has been applied to electric vehicle partial discharge diagnosis using HFCT, electric vehicle partial discharge diagnosis using UHF sensor, and electric vehicle partial discharge diagnosis using HFCT and UHF hybrid sensor.

The method of detecting the occurrence of partial discharge using the electromagnetic wave includes a large amount of other noises in the process of detecting the partial discharge, and the partial discharge signal generated by the partial discharge and the partial discharge similar to the partial discharge. Since it is difficult to accurately distinguish noise or communication noise, the reliability of partial discharge diagnosis is remarkably deteriorated.

The partial discharge signal generally includes some or all of the 500MHz ~ 5GHz frequency band, and the rising time generally includes some or all of the 0.2nS ~ 2.0nS band, and the pulse width has a characteristic that includes some or all of the 1nS ~ 3nS band. Have. The frequency band overlaps with the communication service (noise) band, and some communication services (noise) have the rising time band and the pulse width band, causing serious obstacles in detecting partial discharge. In response to this, a filter (band rejection) is used in the field, but the noise is not completely removed by the filter, so the double triple filter is used, but it has been a problem due to the attenuation side effect of the partial discharge signal. In addition, there was no countermeasure against noise such as the air corona, which is a noise very similar to the partial discharge signal, so there was a situation in which field workers were deeply concerned, but there was no specific alternative.

The partial discharge signal input through the sensor shows a burst of high-frequency pulses with a pulse width of several nS and does not have a standardized pattern. In the partial discharge noise cluster (Burst) or communication noise cluster (Burst) similar to the partial discharge signal, the constituent pulses constituting the cluster are different from the pulses constituting the partial discharge signal cluster. However, especially in the field of cable partial discharge, it is not easy to detect a partial discharge of a cable because the noise is very similar to that of the partial discharge and the signal strength is relatively high.

Conventional partial discharge noise removal technology has been filtering technology, noise gating technology, speed difference noise removal technology, etc., but the filtering technology, especially the band rejection filtering technology, has limited noise removal due to the broadband partial discharge characteristics, and noise gating technology Was not practical because it was not possible to distinguish between noise and partial discharge, and the speed difference noise removal technology was not effective in removing partial discharge noise because there was an error in recognizing this as partial discharge. .

Partial discharge prevention diagnosis is an essential part for safety of people and maintenance of facilities. The biggest challenge in the field of partial discharge prevention diagnosis in the electric power field is noise removal, especially the removal of partial discharge noise such as corona noise.

The partial discharge prevention diagnosis technique using electromagnetic waves is preferred because it shows the best results, but as new communication services are continuously emerging, noise cannot be removed by the method of installing a filter, and noise and partial discharge through high-speed calculation Although there have been attempts to classify them, if they are actually applied in the field, noise is not properly filtered out, there is a loss due to filter mounting in the detected partial discharge signal, and the partial discharge generation band cannot be covered, and the volume is large and not economical. Was limited. Accordingly, there is a limit to noise removal in the conventional filter mounting and high-speed software processing method, and thus a method capable of economically and effectively removing noise without using a filter and high-speed software is required. The partial discharge signal shows the burst form of a high-frequency pulse with a pulse width of several nS, and is different from the partial discharge noise or communication noise similar to other partial discharge signals, but in particular, in the cable partial discharge field, the partial discharge signal and the partial discharge It is not easy to distinguish noise.

Korean Patent Registration No. 10-1496442 (2015.02.17) relates to a cable partial discharge diagnosis device, and the above technology applies a narrow band band pass filter to remove noise, so that the partial discharge signal is filtered so that the partial discharge is properly performed. There is a drawback that cannot be detected. Moreover, even though the bandpass filter is applied, the “partial discharge signal detection unit that distinguishes between noise and PD” proves that noise is introduced. The above technology has a disadvantage in that economical efficiency is inferior because it requires an additional high-speed ADC and software computing process to distinguish between noise and partial discharge signals.

Korean Patent No. 20-0435061 (2006.12.29) relates to a partial discharge counter for diagnosing a gas insulated switchgear, and the above technology also applies a band pass filter to remove noise from the input signal, so that the partial discharge signal is filtered. There is a disadvantage that it cannot be detected properly. Since the peak detection circuit is applied, there is a disadvantage in that the noise signal can be recognized as a partial discharge and counted when a noise larger than the partial discharge signal is introduced within the band of the band pass filter.

1. Korean Patent Registration No. 10-1496442 (2015.02.17) 2. Korean Patent Registration No. 20-0435061 (2006.12.29)

The present invention was devised to solve the above problem.

An embodiment of the present invention is a broadband lossless technology concept such as partial discharge generation timing, partial discharge signal size and synchronization analysis thereof, away from the conventional one-dimensional technology concept based on simple frequency in partial discharge acquisition and noise removal. It is intended to provide a partial discharge detection and noise removal device.

An embodiment of the present invention is to provide a broadband lossless partial discharge detection and noise removal apparatus capable of effectively detecting whether an input signal contains a partial discharge signal.

More specifically, an embodiment of the present invention effectively suppresses noise by comparing synchronization between a partial discharge timing pulse (T-Pulse) and a partial discharge magnitude pulse (Q-Pulse) to remove a signal irrelevant to synchronization as noise. It is intended to provide a broadband lossless partial discharge detection and noise removal device capable of detecting only a lossless broadband partial discharge.

In addition, an embodiment of the present invention can control characteristics that are not recognized as partial discharge according to attenuation according to distance, so that partial discharge noise such as air corona can be removed, and the partial discharge detection distance can be controlled. It is intended to provide a wideband lossless partial discharge detection and noise removal device that can be operated separately.

An embodiment of the present invention is a T/Q pulse type noise removal circuit configuration that further applies PANA (Patial Discharge Amplification Noise Attenuation) technology (Korean Patent Application No. 10-2017-0134573), and noise is By detecting the partial discharge signal from the mixed input signal, there is no need for a filter installation and a high-speed operation process is eliminated, so it is economical and can be used in various fields because the volume can be reduced.

An embodiment of the present invention includes an ultra-stage signal divider, and one output of the first-stage signal divider is input to a partial discharge generation timing pulse acquisition unit, and a timing pulse is acquired and input to one end of the synchronization comparator, and the other output stage of the first-stage signal divider Is input to the partial discharge amplitude pulse acquisition unit, the amplitude pulse is acquired and input to the other end of the synchronization comparator to detect the part where both signals exist at the same time in the time domain, and only the partial discharge signal is obtained to remove the noise. It is intended to provide a broadband lossless partial discharge detection and noise removal device capable of reproducing a discharge signal, and can be used in various devices.

Among the embodiments, the broadband lossless partial discharge detection and noise removal apparatus includes a partial discharge generation timing pulse acquisition unit that acquires a generation timing pulse of the partial discharge signal at the beginning of the generation of the partial discharge signal, and a portion that acquires the magnitude pulse of the partial discharge signal. A discharge amplitude pulse acquisition unit, a synchronization comparison unit for detecting a partial discharge digital signal determined according to synchronization between the generation timing pulse of the partial discharge signal and the amplitude pulse, and an analog signal of the detected partial discharge digital signal And a partial discharge signal generator configured to detect a partial discharge pulse converted to, wherein the synchronization comparison unit detects a corresponding pulse as the partial discharge pulse when the timing pulse of the partial discharge signal and the magnitude pulse are synchronized in a time domain, and If it is not synchronized, the pulse can be determined as noise and removed.

The partial discharge signal generator may reproduce or generate a partial discharge signal through the detected partial discharge pulse.

The partial discharge generation timing pulse acquisition unit is a first proportional signal generation unit that generates first and second proportional signals according to the input signal, and is generated based on the first proportional signal and is fed back to the input terminal through at least one partial discharge capacitor. A first automatic gain adjustment unit that automatically adjusts the gain for the partial discharge detection signal, and a second automatic gain adjustment that performs automatic gain adjustment based on the partial discharge comparison signal generated based on the second proportional signal and fed back to the input terminal. A gain adjusting unit, a timing noise removing unit generating a timing noise removing signal from which timing noise is removed based on the partial discharge detection signal and the partial discharge comparison signal, and a timing pulse generating unit acquiring a timing pulse for generating partial discharge. have.

The partial discharge magnitude pulse acquisition unit is a second proportional signal generation unit that generates third and fourth proportional signals according to the input signal, and is generated based on the third proportional signal and is fed back to the input terminal through at least one partial discharge capacitor. A third automatic gain adjustment unit that performs automatic gain adjustment on the partial discharge detection signal, and a fourth automatic gain that performs automatic gain adjustment based on the partial discharge comparison signal generated based on the fourth proportional signal and fed back to the input terminal. A control unit, a magnitude noise removal unit for generating a magnitude noise removal signal from which magnitude noise is removed based on the partial discharge detection signal and the partial discharge comparison signal, and a magnitude pulse generator for acquiring a partial discharge magnitude pulse.

The first automatic gain adjustment unit feeds back the amplitude or frequency strength of the partial discharge detection signal through the at least one partial discharge capacitor to the input terminal, and if the partial discharge signal is reflected in the partial discharge detection signal, the process of the automatic gain adjustment Temporary over-amplification can be induced at.

The first automatic gain adjustment unit may filter a specific frequency band from the partial discharge detection signal through at least one partial discharge capacitor having one end connected to the output terminal and the other end grounded, and feed back the automatic gain adjustment process.

The third automatic gain adjustment unit adjusts the frequency bandwidth of the partial discharge detection signal input to the input terminal through the at least one partial discharge capacitor and at least one partial discharge resistor connected to one end of the at least one partial discharge capacitor. It may include a partial discharge loop filter module.

The first automatic gain adjuster may perform the frequency bandwidth adjustment through a low pass filter (LPF) or a high pass filter (HPF) implemented through a combination of at least two of a capacitor, an inductor, a resistor, and an amplifier.

The timing noise removing unit and the magnitude noise removing unit may remove a difference between the partial discharge detection signal and the partial discharge comparison signal or add a similar portion to remove components other than the partial discharge as the timing noise and the magnitude noise, respectively. I can.

The timing noise removing unit and the magnitude noise removing unit differentially amplify a difference between the partial discharge detection signal and the partial discharge comparison signal or a difference amplifier that calculates a difference between the partial discharge detection signal and the partial discharge comparison signal. It can be implemented through a differential amplifier (differential amplifier).

The timing pulse generator may generate a timing pulse for generating partial discharge by converting the partial discharge signal obtained from the difference amplifier or the differential amplifier into a TTL (Transistor Transistor Logic) pulse.

Each of the first proportional signal generation unit and the second proportional signal generation unit includes a log detector, an amplifier, an envelope detector, and an integrator that demodulates the log value of the input signal. Integrator) may be implemented through at least one or a combination of at least two.

Each of the timing noise removal unit and the magnitude noise removal unit may further include a noise removal module that removes a signal output with an intensity smaller than a specific reference voltage among output signals to further remove the timing noise and the magnitude noise. .

Each of the timing noise removal unit and the magnitude noise removal unit may determine the specific reference voltage through manual setting by a user or automatic setting through internal feedback or remote feedback.

Each of the timing noise removing unit and the magnitude noise removing unit is a local analog voltage according to a variable resistance manually varied by a user locally, a remote analog voltage provided remotely, or a DAC by remote digital data transmission provided remotely ( Digital to Analog Converter), the manual setting may be performed based on the output.

Each of the timing noise removal unit and the magnitude noise removal unit includes (a) a low-pass filter disposed at an output terminal to filter the timing noise removal signal, and (b) an ADC with a minimum, average or maximum value of the filtered timing noise removal signal. A feedback module for automatically setting the specific reference voltage by detecting through conversion and digital operation and feeding back until a corresponding detection value converges within a specific reference range may be included.

Among the embodiments, the apparatus for detecting and removing noise from a wideband lossless partial discharge adjusts the generation sensitivity of the partial discharge generation timing pulse by controlling a variable amplifier or a variable attenuator by receiving a pulse count from the timing pulse generator. It may further include a control unit for controlling a distance relationship with the source and a network communication module for remotely communicating with a human machine interface (HMI).

delete

The synchronization comparator may variably determine whether the synchronization is performed according to a distance from a source of the partial discharge signal.

The synchronization comparator may determine that the timing pulse and the magnitude pulse are not synchronized in a time domain when the distance is greater than a predetermined reference, and may remove the partial discharge signal as noise.

The synchronization comparison unit analog-to-digital converts the partial discharge magnitude pulse signal by using the partial discharge generation timing pulse as a trigger, and selects a first, second, or third analog-to-digital converter according to the speed of the analog-digital conversion. Can be used as

The first analog-to-digital converter may obtain the partial discharge signal by directly sampling the input RF (Radio Frequency) signal at an RF level without undergoing a modulation process.

The second analog-to-digital converter may obtain the partial discharge signal by receiving a signal amplified or attenuated by a variable amplifying unit controlled by the synchronization comparator without undergoing a special modulation process and sampling at high speed.

The third analog-to-digital converter amplifies or attenuates the input signal and modulates it with an RF log detection module to obtain the partial discharge signal by sampling a peak hold value calculated through a peak hold method that stores a maximum value in a capacitor. have.

The partial discharge signal generator may selectively use first and second digital-to-analog converters that variably determine the topology of each circuit configuration according to a digital-to-analog conversion speed.

The second digital-to-analog converter includes a frequency voltage control RF generator, an RF level control unit for adjusting an RF signal generated from the RF generator, an RF amplifier for amplifying the adjusted RF signal, and an RF burst generated by the amplification. Thus, it may further include an output level control unit for generating a partial discharge signal.

Among the embodiments, the broadband lossless partial discharge detection and noise removal apparatus may have a remote or local control unit. The control unit may digitally or analogly control a variable amplifier, a variable attenuator, and a comparator provided in the timing pulse generator as an output element, and a variable amplifier and a variable attenuator provided in the magnitude pulse generator. In addition, the TTL signal of the timing pulse generator and the output voltage of the magnitude pulse generator may be received as an input feedback element.

Among the embodiments, the broadband lossless partial discharge detection and noise removal apparatus is used when removing partial discharge noise such as a corona, or when detecting a partial discharge, removing noise according to a distance or detecting a partial discharge signal according to a distance, remote or local The control unit controls the output element and receives feedback from the input element to remove the partial discharge noise or to remove the noise according to the distance and detect the partial discharge signal.

Among the embodiments, the broadband lossless partial discharge detection and noise removal system includes a plurality of partial discharge generation sources that are located at a certain distance from each other and generate partial discharge signals mixed with noise, and are disposed at each of the plurality of partial discharge generation sources. A plurality of partial discharge sensors and a data acquisition device for dividing and obtaining a partial discharge signal from a partial discharge signal mixed with noise detected through the plurality of partial discharge sensors, wherein the data acquisition device generates a partial discharge signal. A partial discharge generation timing pulse acquisition unit for acquiring the generation timing pulse of the partial discharge signal at the beginning, a partial discharge amplitude pulse acquisition unit for acquiring the magnitude pulse of the partial discharge signal, the generation timing pulse and the magnitude pulse of the partial discharge signal A plurality of broadbands including a synchronization comparator for detecting a partial discharge digital signal determined according to synchronization of and a partial discharge signal generator for detecting a partial discharge pulse obtained by converting the detected partial discharge digital signal into an analog signal. Lossless partial discharge detection and noise removal devices may be included.

The plurality of broadband lossless partial discharge detection and noise removal devices include the timing of the partial discharge signal of another partial discharge generator detected from a specific partial discharge generator among a plurality of partial discharge generators arranged at the predetermined distance apart from a specific reference. It is determined that the pulse and the magnitude pulse are not synchronized in the time domain, and by removing the partial discharge signal of the other partial discharge generator as noise, only the partial discharge signal of the specific partial discharge generator can be detected.

The plurality of broadband lossless partial discharge detection and noise removal devices do not use a filter and have a broadband characteristic, so that various types of sensors having different bandwidths can be simultaneously used.

The disclosed technology can have the following effects. However, since it does not mean that a specific embodiment should include all of the following effects or only the following effects, it should not be understood that the scope of the rights of the disclosed technology is limited thereby.

The broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention can effectively detect whether the partial discharge signal is included in the input signal.

The broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention effectively removes noise and partial discharge-like noise and prevents partial discharge even when the partial discharge signal, noise and partial discharge-like noise are mixed in the input signal. Make it detectable.

The broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention is referred to as a T/Q pulse method to which a PD Amplification Noise Attenuation (PANA) method (Korean Patent Application No. 10-2017-0134573) is applied. In the T/Q pulse method of the present invention, the partial discharge signal component is amplified more than the reference voltage (Vref) and the noise component is attenuated from the reference voltage (Vref) for the partial discharge signal and the noise signal mixed at the same time. The differential point is given based on and advances in the PANA technology that can detect the partial discharge signal using this differential point, converting the partial discharge detection signal to a timing pulse signal to acquire the signal at the time when the timing signal is generated. In combination with the TTL conversion circuit, the partial discharge generation timing pulse is detected, and the partial discharge signal can be acquired by triggering the ADC using the TTL signal. Furthermore, the partial discharge signal is reproduced or produced and transmitted using a DAC. A partial discharge signal with noise removed can be obtained.

The broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention enables noise removal and partial discharge detection according to a diagnosis distance, so that partial discharge noise such as an air corona can be removed, and a detection boundary can be set. Thus, not only can individual diagnosis of the device to be diagnosed, but also accurate detection of the occurrence site is possible.

The broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention does not use any filter in the partial discharge signal detection system, so there is no frequency limitation, so wideband detection is possible and there is no loss.

The broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention detects the partial discharge signal by acquiring the synchronization timing signal of the partial discharge generation timing pulse and the partial discharge magnitude pulse, and other noises are not mutually synchronized. Since it is not acquired, perfect noise removal is possible, and for example, RFI noise, communication noise, EMI noise and air corona noise can be removed.

Broadband lossless partial discharge detection and noise removal device according to an embodiment of the present invention includes cable partial discharge prevention diagnosis, SIS (Solid Insulation Switchgear), transformer, motor, generator facility partial discharge prevention diagnosis, electric vehicle partial discharge prevention diagnosis, electric vehicle charger. It can be applied to partial discharge prevention diagnosis, GIS (Gas Insulation Switchgear) partial discharge prevention diagnosis, UHF partial discharge sensor with noise removal function, bushing partial discharge prevention diagnosis and partial discharge noise removal module, but is not limited thereto.

1 is a diagram showing a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a partial discharge generation timing pulse acquisition unit of FIG. 1.
3 is a diagram illustrating a first proportional signal generator of FIG. 2.
4 is a diagram illustrating first and second transfer function generation modules of FIG. 3.
5 is a diagram illustrating first and second automatic gain adjustment units of FIG. 2.
6 is a view showing another embodiment of the partial discharge feedback module in FIG. 5.
7 is a diagram illustrating a timing noise removing unit of FIG. 2.
8 is a diagram illustrating a process of acquiring a timing pulse for generating a partial discharge by the apparatus for detecting and removing a broadband lossless partial discharge according to an embodiment of the present invention.
9 is a diagram illustrating a partial discharge magnitude pulse acquisition unit of FIG. 1.
10 is a diagram illustrating a second proportional signal generator of FIG. 9.
11 is a diagram illustrating third and fourth automatic gain adjustment units of FIG. 9.
12 is a diagram illustrating a size noise removing unit of FIG. 9.
13 is a diagram illustrating a process of acquiring partial discharge amplitude pulses by a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention.
14 is a diagram illustrating a synchronization comparison unit of FIG. 1.
15 is a diagram illustrating a partial discharge signal generator of FIG. 1.
FIG. 16 is an input or output during a process of generating a partial discharge timing pulse and a process of generating a partial discharge amplitude pulse and a noise removal process and a partial discharge signal regeneration or production process of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. Is a diagram showing the voltage waveforms.
FIG. 17 is an input or output in the process of generating a partial discharge timing pulse and generating a partial discharge amplitude pulse, a noise removal process, and a partial discharge signal regeneration or production process of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. As a diagram illustrating the voltage waveforms, particularly, as they have the same rising time as the partial discharge, they illustrate the noise removal process for the communication burst noise containing the internal sudden change signal that could not be removed with the previous technology.
FIG. 18 is a diagram illustrating a process of converting a partial discharge signal to a noise signal according to a traveling distance of a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention, and an embodiment of partial discharge detection based on a constant distance relationship. It is a drawing.
FIG. 19 is an input or output during a process of generating a partial discharge timing pulse and a process of generating a pulse of a partial discharge magnitude and a process of removing noise and reproducing or producing a partial discharge signal of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. As a diagram illustrating the voltage waveforms, in particular, a diagram showing an embodiment of a process of converting a partial discharge signal into a noise signal according to a traveling distance and detecting a partial discharge based on a constant distance relationship from different partial discharge sources.
20 is a method for controlling a partial discharge detection distance by distance relation control of a broadband lossless partial discharge detection and noise removal system including a plurality of broadband lossless partial discharge detection and noise removal devices according to an embodiment of the present invention. It is a diagram showing a method of removing a signal, a method of removing noise by comparison between channels, and a remote monitoring.
FIG. 21 is a diagram showing experimental results of removing noise and detecting partial discharge through a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention.
22 is an output result showing a result of detecting whether a partial discharge has occurred by actually implementing a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention (channel B) compared with a conventional technology (channel A) It is a graph.

Since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments can be variously changed and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only those effects, the scope of the present invention should not be understood as being limited thereto.

Meanwhile, the meaning of terms described in the present application should be understood as follows.

Terms such as "first" and "second" are used to distinguish one component from other components, and the scope of rights is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. On the other hand, when it is mentioned that a certain component is "directly connected" to another component, it should be understood that no other component exists in the middle. On the other hand, other expressions describing the relationship between the constituent elements, that is, "between" and "just between" or "neighboring to" and "directly neighboring to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as “comprise” or “have” refer to implemented features, numbers, steps, actions, components, parts, or It is to be understood that it is intended to designate that a combination exists and does not preclude the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

In each step, the identification code (for example, a, b, c, etc.) is used for convenience of explanation, and the identification code does not describe the order of each step, and each step has a specific sequence clearly in context. Unless otherwise stated, it may occur differently from the stated order. That is, each of the steps may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be construed as having meanings in the context of related technologies, and cannot be construed as having an ideal or excessive formal meaning unless explicitly defined in the present application.

1 is a diagram showing a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention.

The present invention relates to a broadband lossless partial discharge detection and noise removal apparatus 1000. More specifically, the broadband lossless partial discharge detection and noise removal apparatus 1000 determines whether or not the first stage partial discharge generation timing pulse and the partial discharge magnitude pulse are synchronized, unlike the conventional ultra-short filter method and/or the subsequent high-speed software processing method. By comparing and removing the signal irrelevant to synchronization, the partial discharge signal can be detected and the noise can be effectively removed. In one embodiment, the broadband lossless partial discharge detection and noise removal apparatus 1000 has a small volume and excellent broadband noise removal performance, and thus can effectively detect a partial discharge signal over a broadband without loss. For example, the timing pulse for partial discharge generation of the broadband lossless partial discharge detection and noise removal device 1000 increases the rising time and pulse width and lowers the amplitude according to the characteristics of the partial discharge signal as the partial discharge signal moves away from the partial discharge source. You lose. Therefore, the broadband lossless partial discharge detection and noise removal apparatus 1000 uses the selectivity of the distance relationship in which the timing pulse for partial discharge is not generated after such a certain distance, and uses the selectivity of the external air corona and partial discharge noise such as motor noise. Can be removed.

In general, in the process of detecting a partial discharge signal, noise removal or suppression by acquiring and analyzing a signal of -65dBm or less, which is a very fine signal, is a very important factor in detecting the partial discharge signal. When various signal bands are overlapped, it is difficult to suppress such noise because of a similar partial discharge signal that is very similar to the partial discharge signal. However, all signals including partial discharge signals have a constant rising time and signal width. The broadband lossless partial discharge detection and noise removal device 1000 accurately detects the partial discharge generation timing pulse and the partial discharge magnitude pulse, and detects a common portion in which the two pulses are synchronized (in the time domain), thereby detecting only the partial discharge signal. And thus can suppress the noise.

Referring to FIG. 1, a broadband lossless partial discharge detection and noise removal device 1000 includes an input port 1, an output port 2, a communication port 4, a network communication module 5, and a first signal distribution module ( 3), a partial discharge generation timing pulse acquisition unit 100, a partial discharge magnitude pulse acquisition unit 200, a synchronization comparison unit 300, a partial discharge signal generation unit 400, and a control unit 500.

In one embodiment, the partial discharge generation timing pulse acquisition unit 100 may acquire a partial discharge generation timing pulse corresponding to the generation timing of the partial discharge signal appearing at the beginning of the generation of the partial discharge signal.

In one embodiment, the partial discharge amplitude pulse acquisition unit 200 may acquire the partial discharge amplitude pulse as a pulse indicating the amplitude of the partial discharge signal, and may be implemented by applying a pair of log amplifiers or dual log amplifiers. For example, the partial discharge magnitude pulse acquisition unit 200 is advantageous in circuit implementation to use a pair of substantially the same model, but log amplifiers having different characteristics may be used.

In an embodiment, the synchronization comparator 300 may detect a partial discharge pulse determined according to synchronization between the generation timing pulse of the partial discharge signal and the magnitude pulse. For example, the synchronization comparator 300 may detect whether the partial discharge generation timing pulse and the partial discharge magnitude pulse are in synchronization in the time domain, determine whether the synchronization is correct pulse as the partial discharge pulse, and It can be determined by noise for the pulse. In one embodiment, the synchronization comparison unit 300 may be implemented by applying a microprocessor having an ADC or a separate ADC therein, and the partial discharge magnitude pulse acquisition unit 200 applies a pair of log amplifiers. Can be implemented. Here, the pair of log amplifiers may each perform an analog operation, obtain a result value, and pass it to the synchronization comparison unit 300.

The partial discharge signal generator 400 may generate a partial discharge signal through the detected partial discharge pulse. In one embodiment, the partial discharge signal generator 400 may be implemented by applying a digital to analog converter (DAC). Here, when the DAC signal is generated, the size of the signal may be provided by amplifying or attenuating the size of the partial discharge signal acquired by the ADC (Analog to Digital Converter) in the same size by the synchronization comparing unit 300. In one embodiment, when the DAC signal is generated, the signal size, burst period, frequency, and waveform may be determined by the synchronization comparing unit 200.

As a result, the broadband lossless partial discharge detection and noise removal apparatus 1000 acquires a partial discharge generation timing pulse through the partial discharge generation timing pulse acquisition unit 100 and a partial discharge signal through the partial discharge magnitude pulse acquisition unit 200. The magnitude of the pulse can be acquired. In this process, the broadband lossless partial discharge detection and noise removal device 1000 receives the partial discharge generation timing pulse as a trigger signal through the synchronization comparator 300 (for example, a microprocessor) and sends the partial discharge signal to the ADC. Detects the size of the detected partial discharge signal, determines the amplitude of the detected partial discharge signal, attenuated or amplified, the burst period, frequency, and waveform, and reproduces or produces only the partial discharge signal with a DAC to effectively suppress noise and detect the partial discharge signal. can do. For example, in the broadband lossless partial discharge detection and noise removal device 1000, the partial discharge generation timing pulse is generated when the partial discharge signal is generated (immediately at the beginning of the partial discharge signal period), so very accurate noise discrimination processing and partial discharge signal It can be acquired. More specifically, the broadband lossless partial discharge detection and noise removal apparatus 1000 may achieve the effect of the present invention by using whether the partial discharge generation timing pulse and the partial discharge magnitude pulse are synchronized. That is, the broadband lossless partial discharge detection and noise removal apparatus 1000 measures the partial discharge magnitude pulse at the same time or almost simultaneously with acquiring the partial discharge generation timing pulse, and obtains only the partial discharge signal purely, thereby removing the partial discharge signal. Can be played and used in a variety of devices. In one embodiment, the broadband lossless partial discharge detection and noise removal apparatus 1000 has a noise removal function by measuring the magnitude of the partial discharge at the same time or almost at the same time as acquiring the partial discharge generation timing pulse and reproducing and transmitting the partial discharge signal. It can be used for an active partial discharge detection sensor module.

FIG. 2 is a diagram illustrating a partial discharge generation timing pulse acquisition unit of FIG. 1.

2, the partial discharge generation timing pulse acquisition unit 100 includes a communication port 4, a network communication module 5, a proportional signal generation unit 110, a first automatic gain adjustment unit 120, and a second An automatic gain adjustment unit 130, a timing noise removal unit 140, a timing pulse generator 150, a variable amplifier/variable attenuator 160, a filter 170, and a control unit 500 may be included.

In an embodiment, the partial discharge generation timing pulse acquisition unit 100 may attach the filter 170 to the front end in order to obtain a more accurate partial discharge generation timing pulse. In one embodiment, the partial discharge generation timing pulse acquisition unit 100 may include a variable/fixed amplifier or a variable/fixed attenuator 160 at the front end in order to obtain a more accurate partial discharge generation timing pulse.

In one embodiment, the partial discharge generation timing pulse acquisition unit 100 may remotely or locally automatically (or manually) control a variable amplifier or a variable attenuator at the front end in order to obtain a more accurate partial discharge generation timing pulse. A control unit 500 can be attached. More specifically, in order to obtain a partial discharge generation timing pulse that generates a trigger signal according to a distance in order to remove partial discharge noise such as corona noise, the partial discharge generation timing pulse acquisition unit 100 has a variable amplifier/ A controller 500 capable of controlling the attenuator 160 may be included. In one embodiment, the control unit 500 may control the distance relationship by receiving a pulse count from the timing pulse generator 150 and controlling the variable amplification/attenuator 160.

The first proportional signal generator 110 may generate first and second proportional signals according to an input signal. More specifically, the first proportional signal generation unit 110 is electrically connected to the variable amplification/attenuator 160 at the input terminal to receive an input signal through the variable amplification/attenuator 160, and the received input signal First and second proportional signals may be generated on the basis of the first and second proportional signals, respectively, generated by being electrically connected to the input terminals of the first and second automatic gain adjustment units 120 and 130 at the output terminal. It may be provided to the input terminals of the first and second automatic gain adjustment units 120 and 130.

In an embodiment, the first proportional signal generation unit 110 may generate first and second proportional signals proportional to the intensity of at least one of an amplitude, a frequency, and a power of the input signal. For example, the input signal When Vin is received, proportional signals V1' and V2' can be generated as DC output voltages proportional to the power appearing at the corresponding input terminal (refer to the graph of FIG. 8). These contents will be described in more detail with reference to FIG. 3.

3 is a diagram illustrating a first proportional signal generator of FIG. 2.

Referring to FIG. 3, the first proportional signal generation unit 110 includes a second signal distribution module 112, first and second log detection modules 114, and first and second transfer function generation modules 116. It may include.

The second signal distribution module 112 may distribute at least two or more input signals, and in one embodiment, generate at least two signals having the same phase and amplitude as the corresponding signal based on the input signal. I can. The second signal distribution module 112 may be electrically connected to the input terminals of the first and second log detection modules 114 at the output terminal, and the input signal received through the variable amplifier/variable attenuator 160 is a first signal. Two signals having the same phase and amplitude may be generated based on the output signal of the distribution module and provided to each of the first log detection module 114a and the second log detection module 114b.

In one embodiment, the second signal distribution module 112 may be implemented by including an amplifier (not shown) that amplifies an input signal to a predetermined specific power gain (eg, 10 dB), and through the amplifier The amplified signal may be distributed to a plurality of signals, and may be implemented as a 1:N (N is a natural number of 2 or more) divider.

The first and second log detection modules 114 may generate first and second proportional signals in proportion to at least one of amplitude, frequency, and power of the input signal. In one embodiment, the first and second log detection modules 114 may be configured in a number corresponding to the number of signal distributions of the second signal distribution module 112, for example, the second signal distribution module ( When 112) is implemented as a 1:3 divider, it may be composed of first to third log detection modules. The first log detection module 114a may receive a first signal distributed from the second signal distribution module 112, and the second log detection module 114b is a second signal distributed from the signal distribution module 112. May be input, and each of the first and second log detection modules 114 may generate each of the first and second proportional signals V1 and V2 as a DC output voltage proportional to the signal power appearing at the corresponding input terminal. (See the graph in Fig. 8).

In an embodiment, each of the first and second log detection modules 114 may be implemented as a log detector that generates an output signal by demodulating a log value of an input signal. Here, the log detector collectively refers to cases expressed as a log detector, a log amplifier, a log amplifier, a logarismic amplifier, an RF power detector, a log amplifier detector, and the like. In this case, the measured value of the total node power at the RF input port may represent the total power to be converted to DC including signal, noise, and interference.

In another embodiment, each of the first and second log detection modules 114 is through at least one of an amplifier, an envelope detector, a diode detector, and an integrator. It may be implemented through a combination of the two, for example, through a combination of an RF amplifier and an envelope detector, or through a combination of an amplifier and an integrator.

Each of the first and second transfer function generation modules 116 may convert a proportional signal input to an input terminal based on a reference voltage and a transfer function to output a transfer function signal. The first transfer function generation module 116a receives the first proportional signal V1 from the first log detection module 114a, generates a first transfer function signal V1' based on the reference voltage Vref and the transfer function, and generates a first automatic gain. It can be output to the input terminal of the controller 120, and the second transfer function generation module 116b receives the second proportional signal V2 from the second log detection module 114b and is based on the same reference voltage Vref and the same transfer function. The second transfer function signal V2' may be generated and output to the input terminal of the second automatic gain adjustment unit 130 (refer to the graph of FIG. 8).

Each of the first and second transfer function generation modules 116 may be provided with a reference voltage Vref having a specific DC voltage level, and the input/output signal is transmitted through a transfer function representing a linear characteristic of input/output signals. At least one of a range, a voltage characteristic of an output signal versus an input signal, and a frequency characteristic may be defined. Here, the transfer function may be designed by a designer or a user, and the input value and range of the reference voltage may be adjusted by the user. In one embodiment, the transfer function, that is, the slope value of the input to the output, is advantageous to have a negative slope characteristic for implementation of the operation, but is not limited thereto, and may have a positive slope characteristic. These contents will be described in more detail with reference to FIG. 4.

4 is a diagram illustrating first and second transfer function generation modules of FIG. 3.

Referring to FIG. 4, each of the first and second transfer function generation modules 116 may include first and second resistors 41 and 42 and an amplifier 43.

The first resistor 41 may be disposed between the input terminal and the first input terminal of the amplifier 43, and the second resistor 42 may be disposed between the second input terminal and the output terminal of the amplifier 43. In an example, each can have a resistance value of several kOhm.

The amplifier 330 may receive a proportional signal from one of the first and second log detection modules 114 to the first input terminal through the first resistor 41 and receive the reference voltage Vref to the second input terminal. The amplification may be performed based on the feedback through the second resistor 42 to generate and output a transfer function signal V1' (or V2') generated based on the reference voltage Vref and corresponding to the transfer function characteristic. (See the graph in Fig. 8). Accordingly, the amplifier 43 may output a transfer function signal reduced by a size corresponding to the input proportional signal based on the reference voltage Vref.

Each of the first and second transfer function generation modules 116 may be implemented to have a property of a transfer function in which the DC output voltage is proportional or inversely proportional to the total RF signal power appearing at the corresponding detector input. In an embodiment, each of the first and second transfer function generation modules 116 may be implemented through a differential amplifier receiving an inverted input signal and a non-inverted input signal as an input signal, based on Equation 1 below. As the transfer function generation module, the characteristics of the transfer function that define the operation range of the transfer function generation module can be determined. Here, Slope denotes the DC output slope characteristic of the output signal versus power appearing at the input terminal defined in the transfer function. Here, VO1 and VO2 refer to output voltages output from the two output terminals, and PI1 and PI2 refer to signal powers appearing at the two input terminals. Here, the transfer function, that is, the slope value of the input to the output, is advantageous to have a negative slope characteristic for implementation of the operation, but is not necessarily limited thereto, and may have a positive slope characteristic.

[Equation 1]

Slope = (VO2-VO1) / (PI2-PI1)

In one embodiment, each of the first and second transfer function generation modules 116 may have an inversely proportional transfer function that converts a value of -60dBm to +5dBm of a corresponding input proportional signal into a value within 1.7Vdc to 0.5Vdc. have. In this case, the reference voltage Vref may be formed within about 2.4Vdc, for example, may be formed to be within a specific reference error range based on 2.4Vdc.

In another embodiment, each of the first and second transfer function generation modules 116 has a proportional transfer function that converts the -60dBm to +5dBm value of the input proportional signal into a value within 0.5Vdc to 1.7Vdc. May be. In this case, the reference voltage Vref may be formed within about 0.5Vdc.

In the above, the signal distribution module 112, the first and second log detection modules 114, and the first and second transfer function generation modules 116 are sequentially arranged in the first proportional signal generation unit 110. Although described as a configuration, it is not limited thereto, and may be implemented through at least some of them, and the arrangement order, arrangement number, and connection structure of the components are a plurality of proportional signals proportional to the amplitude, frequency, or power of the input signal They may be implemented in various circuit types through various embodiments for generating them.

The first automatic gain adjustment unit 120 performs automatic gain adjustment on the partial discharge detection signal generated based on the first proportional signal and fed back to the input terminal through at least one partial discharge capacitor. The first automatic gain adjustment unit 120 may perform automatic gain control (AGC) based on the first proportional signal, and at least one partial discharge of the output signal generated at the output terminal during the automatic gain adjustment process It can be processed through a capacitor and fed back to a feedback terminal corresponding to another input terminal. In an embodiment, the first automatic gain adjuster 120 may perform feedback through at least one partial discharge capacitor and at least one resistor.

In an embodiment, the first automatic gain adjustment unit 120 may perform automatic gain adjustment when the first transfer function signal V1' is input from the proportional signal generation unit 110, and partial discharge in the process of automatic gain adjustment. The detection signal Vf1 is processed into an automatic gain adjustment feedback signal Vf1' generated through at least one partial discharge capacitor and transmitted to the feedback terminal, so that the partial discharge detection signal Vf may be fed back to be modified according to whether the partial discharge signal is included. For example, if a partial discharge signal is included in the input signal Vin, the first automatic gain control unit 120 generates a partial discharge detection signal Vf including a high frequency component according to the characteristics of the corresponding partial discharge signal, and generates at least one partial discharge signal. Through a capacitor, the automatic gain adjustment feedback signal Vf1' can be transformed and fed back to the feedback terminal, and accordingly, the gain in the automatic gain adjustment process can be modified to induce a signal transformation of the partial discharge detection signal Vf according to the high frequency component. If there is (a case of partial discharge in the graph of FIG. 8), and if it is not included, it may not induce a signal transformation of the partial discharge detection signal Vf (a case of partial discharge-like noise or communication noise in the graph of FIG. 8). This will be described in more detail with reference to FIG. 5.

FIG. 5 is a block diagram showing configurations of a first automatic gain adjuster and a second automatic gain adjuster in FIG. 2, respectively. More specifically, FIG. 5(a) shows the first automatic gain adjuster 120, and FIG. 5(b) shows the second automatic gain adjuster 130.

Referring to FIG. 5A, the first automatic gain adjustment unit 120 may include an AGC module 122 and a partial discharge feedback module 124.

The AGC module 122 may perform automatic gain adjustment on the input signal, and in one embodiment, the controlled signal amplitude based on the amplitude change of the signal fed back from the output despite the change in the amplitude of the input signal. It may be implemented with AGC (Auto Gain Control) or AVC (Automatic Volume Control), which is a closed loop feedback control circuit provided. When the strength of the input signal is strong, the AGC module 410 can reduce the volume of the output signal by reducing the gain, and when it is weak, the AGC module 410 can increase the volume of the output signal by increasing the gain. The input/output gain can be dynamically adjusted based on the average signal level or the maximum output signal level of the gain adjustment feedback signal.

The partial discharge feedback module 124 is connected to the output terminal and the feedback terminal of the AGC module 122, and may process the output signal of the AGC module 122 and feed it back to the feedback terminal. The partial discharge feedback module 124 includes at least one partial discharge capacitor 124a and/or at least one partial discharge resistor 124b each connected to at least one of the output terminal and the feedback terminal of the AGC module 122 and one end. It may further include, but may be used alone as a partial discharge capacitor.

In one embodiment, the partial discharge feedback module 124 provides a partial discharge detection signal to the feedback terminal of the AGC module 122 through a parallel configuration of at least one partial discharge capacitor 124a and at least one partial discharge resistor 124b. The automatic gain adjustment feedback signal Vf1' formed through the processing of Vf1 can be fed back. For example, when the partial discharge signal component is reflected in the output partial discharge detection signal, the partial discharge feedback module 124 may charge-discharge between the partial discharge capacitor 124a and the partial discharge resistor 124b composed of an RC parallel circuit. And by changing the amplification degree g of the AGC module 122 by the feedback action, it is possible to induce a temporary over-amplification and fluctuation.

In one embodiment, if there is a resistance provided inside the AGC module 122 and the partial discharge feedback module 124 is purely composed mainly of resistance components, the temporary overweight width and wave are difficult to occur, but partial discharge feedback The module 124 responds to a specific value of the modulation frequency in which the partial discharge signal is modulated to a log value, including an inductance or capacitance component, and changes the amplification degree g of the AGC module 122 to prevent temporary over-amplification or wave or resonance. It can generate a pulse component exceeding the normal output value. In particular, when the partial discharge feedback module 124 has a transfer function characteristic of a negative slope, for example, if the partial discharge feedback module 124 is purely composed mainly of resistance components, the output value of the AGC module 122 is It is formed at 2.6VDC or less, but if a phenomenon such as charging/discharging or over-amplification or wave or resonance or oscillation occurs temporarily, a temporary overpower value of 2.6VDC or more is formed, and accordingly, a pulse exceeding the reference value is formed. I can. In one embodiment, the specific value of the modulation frequency in which the partial discharge signal is modulated to a log value refers to a modulation signal including some or all of the rising time 6nS ~ 10nS, but circuit configuration, component characteristics, PCB material and pattern characteristics, etc. Therefore, it may be changed, and it will include a case where the input RF signal has amplification or attenuation correction in consideration of the loss in the circuit within the range of -65dBm ~ 5dBm in general, but this also depends on the circuit configuration, component characteristics, PCB material and pattern characteristics can be changed. In general, when the amplification degree is high compared to the signal condition, a relationship capable of better detecting the generation timing of the low level partial discharge signal may be formed.

The partial discharge signal is a burst composed of high-frequency components having a pulse width of several nS, while noise may be formed as a cluster of relatively low-frequency components having a wide pulse width. In one embodiment, when the log detector circuit is passed, the burst of the partial discharge signal takes the form of an impulse, and the noise takes the form of a gentle triangular wave. In one embodiment, the impulse-shaped waveform is composed of a high-frequency component in a frequency spectrum, and the gentle triangular wave is composed of a relatively low-frequency component, so that the response in the partial discharge feedback module 124 configured as an RC parallel circuit is different from each other. . More specifically, the RC parallel circuit of the partial discharge feedback module 124 composed of a specific R value and C value responds to the impulse, but does not respond to the gentle triangular wave (refer to the graph of FIG. 8).

In one embodiment, when the partial discharge detection signal is output from the output terminal of the AGC module 122, the partial discharge feedback module 124 is connected to the corresponding output terminal and charged through an RC parallel circuit composed of a capacitor and a resistor each having an appropriate value. -Discharge feedback is formed to reduce the high-frequency component in the partial discharge detection signal, resulting in lowering the intensity of the output signal. Instead of the automatic gain adjustment feedback signal as the output signal, an automatic gain adjustment feedback signal with a reduced high frequency component is used. By giving feedback to the AGC module 122, the amplification degree for automatic gain adjustment is temporarily increased or the output slope (g) is temporarily changed so that the AGC module 122 temporarily over-amplifies or causes a wave according to the feedback. can do.

The partial discharge feedback module 124 may be implemented through configurations of other various embodiments. In one embodiment, the partial discharge feedback module 124 may be implemented as at least one RC parallel circuit composed of a single capacitor and a single resistor, as described above, and in other embodiments, as shown in FIG. Likewise, at least one partial discharge capacitor 124a, at least one partial discharge resistor 124b, at least one partial discharge inductor 124c, and at least one partial discharge amplifier 124d through a combination of at least some of However, it may be, but is not limited thereto, and may be implemented through various combinations of configurations configured to feed back the signal modification to the automatic gain adjustment process of the AGC module 122 by applying a signal modification to the output signal to correspond to the characteristic of the partial discharge signal. I can.

The first automatic gain adjustment unit 120 feeds back the amplitude or frequency of the partial discharge detection signal through at least one partial discharge capacitor 124a to the input terminal, and automatically gains the partial discharge signal when the partial discharge detection signal is reflected. Temporary over-amplification can be induced in the process of regulation.

For example, if a partial discharge signal is included in the input signal Vin, the first automatic gain adjustment unit 120 reflects the partial discharge signal component and performs an automatic gain adjustment on the input transfer function signal V1'. The partial discharge detection signal Vf1 reflecting the signal component can be generated, and the voltage gain for automatic gain adjustment is automatically adjusted so that the voltage gain for automatic gain adjustment is temporarily increased by receiving the feedback signal Vf1' processed through the partial discharge feedback module 124 Thus, a temporary over-amplification can be performed, and through this process, a partial discharge detection signal Vf1 modified compared to the transfer function signal V1' can be output (a case of partial discharge in the graph of FIG. 8). For another example, if the input signal Vin does not contain a partial discharge signal, the first automatic gain adjustment unit 120 performs automatic gain adjustment on the input transfer function signal V1' by reflecting the partial discharge-like noise or communication noise component. In the process of performing the partial discharge feedback module 124, the voltage gain for automatic gain adjustment is automatically adjusted by receiving feedback of the unprocessed automatic gain adjustment feedback signal Vf1' so that there is no temporary over-amplification. Through the process, the partial discharge detection signal Vf1 that is not deformed compared to the transfer function signal V1' or deformed below the reference range may be output (a case of partial discharge-like noise or communication noise in the graph of FIG. 8). As a result, the first automatic gain adjustment unit 120 may output the partial discharge detection signal Vf1 having different waveform characteristics depending on whether the partial discharge signal is included.

In an embodiment, the first automatic gain adjustment unit 120 outputs a partial discharge detection signal with a voltage gain corresponding to the calculated voltage gain adjustment factor g by calculating a voltage gain adjustment factor g based on Equation 2 below. The voltage gain adjustment factor g may be adjusted in real time according to the feedback through the partial discharge feedback module 124 and reflected in the voltage gain adjustment. For example, assuming a partial discharge occurrence situation, as shown in FIG. 8, the first automatic gain adjustment unit 120 uses the partial discharge detection signal Vf1 output in real time to the amplitude and frequency by the partial discharge feedback module 124. The voltage gain can be temporarily increased by calculating the voltage gain adjustment factor g as a high value by receiving feedback from the automatic gain adjustment feedback signal Vf1' of which the intensity of is modified, and the voltage gain can be temporarily increased. 1 Transfer function signal V1' (or first proportional signal V1') can be temporarily over-amplified to immediately reflect the occurrence of partial discharge to the partial discharge detection signal Vf1, and consequently, through a series of feedbacks. It is possible to output the partial discharge detection signal Vf1 temporarily over-amplified from this point. In one embodiment, the automatic gain adjustment unit 130 may perform automatic gain adjustment such that the average voltage gain becomes 1 when such temporary over-amplification does not occur.

In one embodiment, the automatic gain control unit 130 temporarily has a partial discharge signal having a higher or lower wave signal value based on Vref as a result of the temporary over-amplification in the signal section containing the partial discharge signal. , In a section where there is no partial discharge signal, a noise signal having a value lower than Vref may be obtained. (Refer to Vf1 in the graph of Fig. 8)

[Equation 2]

(Wherein, g is a voltage gain adjustment factor, that is, a voltage amplification degree or a slope characteristic of an output voltage versus input, v ₁ ′ means a transfer function signal, v _f1 means a partial discharge detection signal, and , V _f1 means automatic gain adjustment feedback signal)

The first automatic gain adjustment unit 120 filters a specific frequency band from the partial discharge detection signal through at least one partial discharge capacitor 124a with one end connected to the output terminal and the other end grounded to provide feedback to the corresponding automatic gain adjustment process. can do. In one embodiment, the first automatic gain adjustment unit 120 filters a high-frequency signal out of a preset specific frequency band in the frequency response characteristic of the partial discharge detection signal through the partial discharge feedback module 124 configured with an RC parallel circuit. In this filtering process, the partial discharge loop filter signal transformed from the partial discharge detection signal into an amount of charge and discharge may be fed back to the automatic gain adjustment process of the AGC module 122. For example, the partial discharge feedback module 124 may function as a low pass filter (LPF) through such an RC coupling configuration and may form a resonance point for a specific frequency band. For example, the partial discharge detection signal Vf1 The automatic gain control feedback signal Vf1' in which a signal of 500 MHz or higher frequency band is filtered may be fed back to the AGC module 122.

In this case, in one embodiment, the partial discharge capacitor 124a may be designed to have a capacitance value of 30 pF to 300 pF, or in the case of a commercial log amplifier having a pulse response time, that is, a fall time/rise time of 6 ns/8 ns, respectively. It may be designed to have a capacitance value of 55pF to 56pF, and the partial discharge resistor 124b may be designed to have a value of several kohm to several hundred kohm according to the capacitor design range of the partial discharge capacitor 124a. For example, it can be designed to have a resistance value of 20kOhm ~ 40kOhm. In one embodiment, the device value may be adjusted or changed in consideration of the length of the pattern, the width of the pattern, and the dielectric constant of the material in the PCB pattern design.

As described above, in one embodiment, the partial discharge feedback module 124 may perform feedback through at least one partial discharge capacitor 124a and at least one partial discharge resistor 124b, and another embodiment In, feedback may be performed through a low pass filter (LPF) or a high pass filter (HPF) implemented through a combination of at least two of a capacitor, an inductor, a resistor, and an amplifier. For example, as shown in Fig. 6(a), the partial discharge feedback module 124 may be composed of a partial discharge capacitor 124a, a partial discharge resistor 124b, and a partial discharge inductor 124c, and such a combination Through the configuration, it can function as an LPF or a module with a specific resonance point. In another embodiment, as shown in FIG. 6(b), the partial discharge feedback module 124 may be composed of a partial discharge capacitor 124a, a partial discharge resistor 124b, and a partial discharge amplifier 124d. It can function as an LPF through the same combination configuration.

In the above, exemplary configurations for implementing the partial discharge feedback module 124 have been described, but the present invention is not limited thereto, and the output signal of the AGC module 122 is transformed and fed back to detect partial discharge to over-amplify when partial discharge occurs. , Voltage gain adjustment factor (g), input-to-output voltage vs. slope characteristics, and a function to induce a wave can be configured in various forms necessary.

In one embodiment, the first log detection module 114a, the first transfer function generation module 116a, and the AGC module 122 of FIG. 3 may be replaced with a first commercial log amplifier, and in particular, the output log value is negative. It may be replaced with a first commercial log amplifier having a slope of, and the partial discharge feedback module 124 module may be disposed between a setpoint input port capable of controlling the output slope of the log amplifier and a log amplifier output port. In one embodiment, the second log detection module 114b, the second transfer function generation module 116b, and the AGC module 132 may be replaced with a second commercial log amplifier, and the first commercial log amplifier and the first 2 Commercial log amplifiers may correspond to products with the same characteristics.

The second automatic gain adjustment unit 130 performs automatic gain adjustment based on the partial discharge comparison signal generated based on the second proportional signal and fed back to the input terminal.

Referring to FIG. 5B, the second automatic gain adjustment unit 130 may include an AGC module 132. In one embodiment, when a second proportional signal or a second transfer function signal is received, the second automatic gain adjustment unit 130 performs automatic gain adjustment on the input received through the AGC module 132, and the output signal A partial discharge comparison signal may be generated by feeding back to the feedback terminal of the input terminal. For example, the second automatic gain adjustment unit 130 detects partial discharge by performing automatic gain adjustment on the received second proportional signal (or second transfer function signal V2') regardless of whether the partial discharge signal is included or not. Through a series of processes of generating signal Vf2 and feeding back the partial discharge detection signal generated in the process of automatic gain adjustment to the feedback terminal, it is not deformed or less than the reference range compared to the second proportional signal (or the second transfer function signal V2'). The modified partial discharge comparison signal Vf2 may be output (refer to the graph of FIG. 8 ). As a result, the partial discharge detection signal Vf1 generated by the first automatic gain adjustment unit 120 and the partial discharge comparison signal Vf2 generated by the second automatic gain adjustment unit 130 indicate whether the partial discharge signal is included in the input signal. Depending on whether or not, it may be output as an analog signal having a different value. In one embodiment, the first automatic gain adjuster 120 and the second automatic gain adjuster 130 transmit the output signal to the input terminal of the timing noise canceling unit 140 and control the timing with themselves to adjust the output impedance. A resistance of several kohms disposed between the input terminals of the noise removing unit 140 may be further included.

7 is a circuit diagram of a timing noise removing unit in FIG. 2 according to an embodiment.

Referring to FIG. 7, the timing noise removing unit 140 receives the partial discharge detection signal Vf2 as a first input, receives the partial discharge comparison signal Vf1 as a second input, and subtracts the second input from the first input. It may be configured as a difference amplifier 620. In one embodiment, the timing noise removal unit 140 may function as a subtractor that amplifies the difference in the intensity of the inputs of both inputs to voltage gain 1 using an operational amplifier. In another embodiment, the operational amplifier is used. It can also function as a differential amplifier that amplifies the difference in the strength of the inputs of both inputs with a voltage gain of more than 1 or less than 1.

In one embodiment, the timing noise removing unit 140 may receive a partial discharge detection signal and a partial discharge comparison signal through the plurality of resistors 610, for example, the second automatic gain adjustment unit 130 The first resistor 610a is disposed between the output terminal of and the first input terminal of the difference amplifier 620 to transmit the first partial discharge detection signal Vf1, the output terminal of the second automatic gain adjustment unit 130 and the difference amplifier ( A second resistor 610b disposed between the second input terminals of the 620 and transmitting the second partial discharge detection signal Vf2, and a third resistor 610c disposed between the first input and output terminals of the difference amplifier 620 and fed back. ) And a fourth resistor 610d disposed between the second input terminal of the difference amplifier 620 and the ground. In one embodiment, the plurality of resistors 610 may be designed to have the same resistance value within a resistance range of several kohms.

The timing noise removal unit 140 generates a noise removal signal from which partial discharge noise is removed based on the partial discharge detection signal and the partial discharge comparison signal. For example, the timing noise removal unit 140 may generate a noise removal signal by performing filtering on two input signals based on a reference voltage, and compare the partial discharge detection signal and the partial discharge based on the reference voltage. A noise removal signal may be generated by buffering, amplifying or subtracting only a part of the signal.

The timing noise removal unit 140 may remove a component other than the partial discharge as noise by removing a difference portion between the partial discharge detection signal and the partial discharge comparison signal or summing a similar portion. In one embodiment, the timing noise removal unit 140 compares the difference between the partial discharge detection signal Vf1 and the partial discharge comparison signal Vf2, determines the similar part as noise, and processes it to erase, obtains the remaining part, and obtains the noise removal signal. Vout (denoise) can be generated (refer to the graph of FIG. 8).

In one embodiment, the timing noise removal unit 140 is a difference amplifier that calculates a difference between the partial discharge detection signal and the partial discharge comparison signal, or differential amplification between the partial discharge detection signal and the partial discharge comparison signal. It can be implemented through a differential amplifier (differential amplifier). For example, the timing noise removal unit 140 generates a noise removal signal by subtracting the partial discharge comparison signal from the partial discharge detection signal in order to generate the noise removal signal, and a difference amplifier using a single +5Vdc power supply as an operating power source. Alternatively, it may be implemented as a differential amplifier that differentially amplifies a difference between them based on a reference voltage or an arbitrary specific voltage to generate a noise removal signal.

In one embodiment, the timing noise removal unit 140 cancels the difference signal through a subtraction operation between the partial discharge detection signal and the partial discharge comparison signal, and restores the original signal through the reverse process of generating a proportional signal from the erased signal. Thus, a noise removal signal can be generated. For example, the timing noise removal unit 140 may generate the noise removal signal Vout by removing the partial discharge comparison signal Vf2 from the partial discharge detection signal Vf1 and then modulating a log value of the corresponding signal.

In another embodiment, the timing noise removing unit 140 may determine and obtain the difference between the partial discharge detection signal and the partial discharge comparison signal as partial discharge timing noise, and obtain the second signal distribution module 112 from the input signal. Through this, a timing noise removal signal may be generated by erasing a corresponding difference part from input signals distributed to have the same amplitude.

The timing noise removal unit 140 may further include a timing noise removal module (not shown) that removes a signal output with an intensity less than a specific reference voltage among the output signals to further remove timing noise. For example, the timing noise removal unit 140 applies a voltage that is raised in response to the occurrence of partial discharge through a timing noise removal module implemented including at least one diode to be below a certain specific voltage, reference voltage, or reference voltage. By dropping, a timing noise removal signal from which a timing noise component is additionally removed may be generated.

The timing noise removal unit 140 may determine the specific reference voltage for additional removal of timing noise through manual setting by a user or automatic setting through internal feedback.

In one embodiment, the timing noise removal unit 140 includes a local analog voltage according to a variable resistance manually variable by a user in the local, a remote analog voltage provided remotely, or a DAC by remote digital data transmission provided remotely. Digital to Analog Converter) can be manually set based on the output. For example, the timing noise removing unit 140 may include an input means for receiving a variable resistance input by a user, and when a variable resistance value is designated by a user locally, the variable resistance is set to the designated variable resistance value. The resulting analog voltage may be determined as the specific reference voltage. For another example, the timing noise removal unit 140 is designated by the user from an external partial discharge processing server (not shown) or a partial discharge processing terminal (not shown) connected remotely through the control unit 500 The variable resistance value can be received.

In another embodiment, the timing noise removal unit 140 may include a low pass filter (not shown) and a feedback module (not shown). Here, a low-pass filter is disposed at the output terminal to filter the timing noise removal signal, and the feedback module detects the minimum, average, or maximum value of the filtered timing noise removal signal through ADC conversion and digital operation, and the corresponding detection value The specific reference voltage may be automatically set by feeding back to the control unit 500 until convergence within this specific reference range. For example, when the timing noise removal signal is generated, the timing noise removal unit 140 is associated with a low frequency in the timing noise removal signal through a low-pass filter disposed at the output terminal, and removes the remaining signals except for a specific frequency region set by the user. By repeating the ADC conversion and digital calculation process until the average value of the filtered and filtered timing noise removal signal is within the preset reference average value range, feedback to the control unit 230 so that a specific reference voltage is automatically set during this process. have.

When the timing noise removal signal is greater than or equal to the reference amplitude, the timing pulse generator 150 recognizes it as a partial discharge generation timing pulse and generates a separate partial discharge notification signal or partial discharge generation timing pulse converted to a TTL (Transistor Transistor Logic) level. And, in one embodiment, a partial discharge notification signal may be generated to have a specific amplitude and duration. Here, the reference amplitude can be set by the designer based on the design target regarding accuracy and speed, and design values of the internal components can be adjusted to have the corresponding reference amplitude.

In one embodiment, the timing pulse generator 150 further generates a timing pulse signal for partial discharge by converting a partial discharge signal obtained from a difference amplifier or a differential amplifier into a TTL (Transistor Transistor Logic) pulse using a Schmitt trigger circuit. can do.

In one embodiment, TTL pulsing may be further implemented by using a comparator or through analog to digital conversion. More specifically, the timing pulse generation unit 150 may acquire a partial discharge generation timing pulse through the generated partial discharge generation timing pulse signal.

In an embodiment, the timing pulse generator 150 may include at least one of a comparator and a Schmitt-trigger to perform conversion to a TTL level.

For example, if the amplitude difference between the partial discharge detection signal and the partial discharge comparison signal is greater than or equal to a specific reference voltage Vt, the timing pulse generator 150 sets a specific voltage level indicating data 1 (high) for a specific duration (e.g. For example, a comparator that generates clockwise), a level trigger or edge trigger that triggers whether the output of the comparator represents data 1 (hgin), and voltage level adjustment It may be implemented by including a combination of at least one of level shifters. Accordingly, the timing pulse generator 150 may provide a TTL level partial discharge notification signal for digital signal processing, so that it can be used as a pulse signal input for digital processing in a later step.

In one embodiment, the partial discharge generation timing pulse acquisition unit 100 may further include a network communication module 5, and when a partial discharge notification signal is generated, an alarm sound is output and the network is transmitted to the network through the network communication module 5. A notification message about the occurrence and information about the waveform may be transmitted to the connected partial discharge processing server or partial discharge processing terminal. In addition, the partial discharge generation timing pulse acquisition unit 100 measures the intensity of the partial discharge timing signal using the digital signal converted from the ADC, and monitors the change in the partial discharge intensity through analysis according to the intensity for each time period, thereby monitoring the facility remotely and remotely. It can also be used as preventive diagnostic equipment.

8 is a diagram illustrating a process of acquiring a timing pulse for generating a partial discharge by the apparatus for detecting and removing a broadband lossless partial discharge according to an embodiment of the present invention.

8 illustrates voltage waveforms input or output during a partial discharge generation timing pulse generation process and an output signal generation process of a synchronization comparator, removal of timing noise, acquisition of a partial discharge generation timing pulse, reproduction of a partial discharge signal, or during production.

In FIG. 8, the partial discharge generation timing pulse acquisition unit 100 may receive an input signal, and the proportional signal generation unit 110 is proportional to the strength of the input signal Vin (eg, demodulates the log value of Vin). A) A first proportional signal V1 and a second proportional signal V2 may be generated. For example, among the RF burst signals demodulated to a log value by the proportional signal generator 110, the portion corresponding to the partial discharge signal has a waveform having a very narrow (for example, impulse) shape. The proportional signals V1 and V2 may be output, and noise other than the partial discharge may be output as the proportional signals V1 and V2 having a relatively gentle waveform.

As described above, the proportional signal generation unit 110 includes first and second characteristics according to the set reference voltage Vref and the slope of the transfer function (eg, Slope = (VO2-VO1) / (PI2-PI1)). First and second transfer function signals V1' and V2' corresponding to the proportional signals V1 and V2, respectively, may be generated. Here, PI is the strength of the RF burst input seen in the process of generating the corresponding transfer function signal.

The first automatic gain adjustment unit 120 performs automatic gain adjustment on the input first transfer function signal V1', and the partial discharge detection signal Vf1 output in the automatic gain adjustment process is a partial discharge feedback module composed of an RC parallel circuit. Through 124, the partial discharge loop filter signal Vf1' is transformed and transmitted to the feedback terminal of the AGC module 122 to perform a series of partial discharge detection feedback, thereby outputting the partial discharge detection signal Vf1. The first automatic gain adjustment unit 120 feeds back the automatic gain adjustment feedback signal Vf1' obtained by temporarily dropping the voltage in the high frequency band from the partial discharge detection signal through the partial discharge feedback module 124 to the AGC module 122. In response to the corresponding feedback, the voltage gain may be increased through the AGC module 122 to over-amplify the amplitude of the partial discharge detection signal Vf1 output while the corresponding drop is continued compared to the original signal.

In FIG. 8, when the partial discharge signal is included in the input signal Vin, a partial discharge detection signal Vf1 that is modified compared to the first transfer function signal may be generated, and when the partial discharge-like noise or communication noise is included, it is not substantially modified. A partial discharge comparison signal Vf2 may be generated. In the above, for convenience, the partial discharge detection signal Vf1 and the automatic gain adjustment feedback signal Vf1' are separately illustrated, but may be expressed as substantially the same node voltage according to an implemented embodiment or a parasitic factor in a layout arrangement design.

The timing noise removal unit 140 may output a timing noise removal signal Vout (denoise) by removing the partial discharge timing noise based on a difference between the partial discharge detection signal Vf1 and the partial discharge comparison signal Vf2. The timing noise removing unit 140 may remove a difference portion between the partial discharge detection signal Vf1 and the partial discharge comparison signal Vf2 or add a similar portion to remove components other than the partial discharge as timing noise. In one embodiment, the timing noise removing unit 140 generates a partial discharge timing signal after erasing the difference portion through a subtraction operation between the partial discharge detection signal Vf1 and the partial discharge comparison signal Vf2, and detects only the partial discharge using this. Through the reverse process of the proportional signal generation process, the original signal can be reproduced or a partial discharge signal similar to the original signal can be produced to generate a pure partial discharge signal Vout (denoise) from which partial discharge noise is removed.

The timing noise removal unit 140 may complete the noise removal signal Vout (denoise) by removing a signal output with an intensity less than a specific reference voltage among the output signals in order to further reduce some remaining noise components.

When the difference between the partial discharge detection signal and the partial discharge comparison signal is greater than or equal to Vt, the timing pulse generator 150 may generate a TTL level partial discharge notification signal Vout (timing). Vt is a reference voltage applied to a comparator (not shown), and if the difference between the partial discharge detection signal and the partial discharge comparison signal is more than Vt, a positive TTL signal is generated, and the difference between the partial discharge detection signal and the partial discharge comparison signal is less than Vt If it is, zero potential is output.

According to the above embodiments, the partial discharge generation timing pulse acquisition unit 100 may generate a differential timing noise removal signal by selectively performing feedback according to whether or not the partial discharge signal is included in the input signal. When it is determined that the discharge signal is included, a partial discharge notification signal may be generated to notify this.

9 is a diagram illustrating a partial discharge magnitude pulse acquisition unit of FIG. 1.

9, the partial discharge magnitude pulse acquisition unit 200 includes a communication port 4, a network communication module 5, a variable amplification/variable attenuator 260, a second proportional signal generator 210, and a third An automatic gain adjustment unit 220, a fourth automatic gain adjustment unit 230, a magnitude noise removal unit 240, a magnitude pulse generator 250, and a control unit 500 may be included.

The second proportional signal generation unit 210 generates third and fourth proportional signals according to the input signal. More specifically, the proportional signal generation unit 210 is electrically connected to the variable amplification/attenuator 260 at the input terminal and may receive an input signal through the variable amplifier/variable attenuator 260, based on the received input signal. The third and fourth proportional signals may be generated at the output terminal, and the third and fourth proportional signals generated by being electrically connected to the input terminals of the third and fourth automatic gain adjustment units 220 and 230 are respectively third. And it may be provided to the input terminal of the fourth automatic gain adjustment unit (220, 230).

In one embodiment, the proportional signal generator 210 may generate third and fourth proportional signals proportional to the intensity of at least one of the amplitude, frequency, and power of the input signal. For example, the input signal is received. Then, proportional signals V3' and V4' can be generated as DC output voltages proportional to the power appearing at the corresponding input terminal (refer to the graph of FIG. 13). The magnitude pulse generator 250 outputs Vout(Q) by performing voltage buffering or line output stabilization for Vout(q) (denoise). This will be described in more detail with reference to FIG. 10.

10 is a diagram illustrating a second proportional signal generator of FIG. 9.

Referring to FIG. 10, the second proportional signal generation unit 210 includes a third signal distribution module 212, third and fourth log detection modules 214, and third and fourth transfer function generation modules 216. ) Can be included.

The third signal distribution module 212 may distribute at least two or more input signals, and in one embodiment, generate at least two signals having the same phase and amplitude as the corresponding signal based on the input signal. I can. The third signal distribution module 212 may be electrically connected to the input terminals of the third and fourth log detection modules 214 at the output terminal, and the input signal received through the variable amplifier/variable attenuator 260 is a third signal. Two output signals having the same phase and amplitude may be generated through the distribution module 212 and provided to each of the third log detection module 214a and the fourth log detection module 214b.

In one embodiment, the third signal distribution module 212 may be implemented by including an amplifier (not shown) that amplifies the input signal to a predetermined specific power gain (eg, 10 dB), and through the amplifier The amplified signal may be distributed to a plurality of signals, and may be implemented as a 1:N (N is a natural number of 2 or more) divider.

The third signal distribution module 212 may generate third and fourth proportional signals to be proportional to at least one of amplitude, frequency, and power of the input signal. In one embodiment, the third and fourth log detection modules 214 may be configured in a number corresponding to the number of signal distributions of the third signal distribution module 212, for example, the third signal distribution module ( When 212) is implemented as a 1:3 divider, it may be composed of third to fourth log detection modules. The third log detection module 214a may receive one signal distributed from the third signal distribution module 212, and the fourth log detection module 214b may receive another signal distributed from the third signal distribution module 212. One signal can be input, and each of the third and fourth log detection modules 214 generates the third and fourth proportional signals V3 and V4 as a DC output voltage proportional to the signal power appearing at the corresponding input terminal. can do.

In one embodiment, each of the third and fourth log detection modules 214 may be implemented as a log detector that generates an output signal by demodulating a log value of an input signal. Here, the log detector collectively refers to cases expressed as a log detector, a log amplifier, a log amplifier, a logarismic amplifier, an RF power detector, a log amplifier detector, and the like. In this case, the measured value of the total node power at the RF input port may represent the total power to be converted to DC including signal, noise, and interference.

In another embodiment, each of the third and fourth log detection modules 214 is through at least one of an amplifier, an envelope detector, a diode detector, and an integrator. It may be implemented through a combination of the two, for example, through a combination of an RF amplifier and an envelope detector, or through a combination of an amplifier and an integrator.

Each of the third and fourth transfer function generation modules 216 may output a transfer function signal by converting a proportional signal input to the input terminal based on a reference voltage and a transfer function. The third transfer function generation module 216a receives the third proportional signal V3 from the third log detection module 214a and generates the first transfer function signal V3' based on the reference voltage Vref and the transfer function, thereby generating a third automatic gain. The fourth transfer function generating module 216b receives the fourth proportional signal V4 from the fourth log detection module 214b and is based on the same reference voltage Vref and the same transfer function. The fourth transfer function signal V4' may be generated and output to the input terminal of the fourth automatic gain adjustment unit 230.

Each of the third and fourth transfer function generation modules 216 may be provided with a reference voltage Vref having a specific DC voltage level, and the input/output signal is transmitted through a transfer function representing a linear characteristic of input/output signals. At least one of a range, a voltage characteristic of an output signal versus an input signal, and a frequency characteristic may be defined. Here, the transfer function may be designed by a designer or a user, and the input value and range of the reference voltage may be adjusted by the user.

In one embodiment, the third log detection module 214a and the first transfer function generation module 216a of FIG. 10 and the AGC module 222 of FIG. 11 may be replaced with a third commercial log amplifier, and in particular, the output log The value can be replaced with a third commercial log amplifier with a negative slope, and a partial discharge loop filter module 224 is placed between the loop filter input port and the log amplifier output port that can control the output frequency bandwidth of the log amplifier. can do. The fourth log detection module 214b, the fourth transfer function generation module 216b, and the AGC module 232 can be replaced with a fourth commercial log amplifier, and the third commercial log amplifier and the fourth commercial log amplifier are It may be a product with the same characteristics. In addition, the first, second, third, and fourth commercial log amplifiers may each have the same or substantially the same characteristics.

11 is a diagram illustrating third and fourth automatic gain adjustment units of FIG. 9.

More specifically, FIG. 11(a) shows a third automatic gain adjustment unit 220, and FIG. 11(b) shows a fourth automatic gain adjustment unit 230.

Referring to FIG. 11A, the third automatic gain adjustment unit 220 may include an AGC module 222 and a partial discharge loop filter module 224.

The AGC module 222 may perform automatic gain adjustment on the input signal, and in one embodiment, the controlled signal amplitude based on the amplitude change of the signal fed back from the output despite the change in the amplitude of the input signal. It may be implemented with AGC (Auto Gain Control) or AVC (Automatic Volume Control), which is a closed loop feedback control circuit provided. When the strength of the input signal is strong, the AGC module 222 can reduce the volume of the output signal by reducing the gain, and when it is weak, the AGC module 222 can increase the volume of the output signal by increasing the gain. The input/output gain can be dynamically adjusted based on the average signal level or the maximum output signal level of the gain adjustment feedback signal.

The partial discharge loop filter module 224 is connected to an input terminal of the AGC module 222 and may process an input signal of the AGC module 222 and input it to the input terminal. The partial discharge loop filter module 224 may further include at least one partial discharge capacitor 224a or/and at least one partial discharge resistor 224b each connected at one end of the input terminal of the AGC module 222. .

In one embodiment, the partial discharge loop filter module 224 is a filter between the partial discharge capacitor 224a and the partial discharge resistor 224b composed of an RC parallel circuit when the partial discharge signal component is reflected in the input partial discharge detection signal. As a function, the output frequency bandwidth can be changed.

At this time, in one embodiment, the partial discharge capacitor 224a may be designed to have a capacitance value of 1nF to 10uF, but some parts may be changed according to the designer's intention, peripheral circuit component characteristics, circuit configuration, PCb material, and pattern characteristics. The partial discharge resistor 224b may be designed to have a value of several kohm to several hundreds kohm according to the capacitor design range of the partial discharge capacitor 224a. For example, 20 kOhm It can be designed to have a resistance value of ~ 40kOhm, and the device value can be adjusted and changed in consideration of the length of the pattern and the dielectric constant of the material in the PCB pattern design.

In the above, exemplary configurations for implementing the partial discharge loop filter module 224 have been described, but the present invention is not limited thereto, and when partial discharge or noise occurs by modifying the input signal of the AGC module 222 to detect partial discharge. It goes without saying that it can be configured in various forms necessary for the function to reduce the frequency bandwidth by suppressing the high frequency component of the waveform.

The fourth automatic gain adjustment unit 230 performs automatic gain adjustment based on the partial discharge comparison signal generated based on the fourth proportional signal and fed back to the input terminal.

Referring to FIG. 11B, the fourth automatic gain adjustment unit 230 may include an AGC module 222. In one embodiment, when the fourth proportional signal or the fourth transfer function signal is received, the third automatic gain adjustment unit 230 performs automatic gain adjustment on the input received through the AGC module 222, and the output signal A partial discharge comparison signal may be generated by feeding back to the feedback terminal of the input terminal.

For example, the fourth automatic gain adjustment unit 230 detects partial discharge by performing automatic gain adjustment on the received fourth proportional signal (or fourth transfer function signal V4') regardless of whether the partial discharge signal is included or not. Through a series of processes of generating signal Vf4 and feeding back the partial discharge detection signal generated in the process of automatic gain adjustment to the feedback terminal, it is not deformed or less than the reference range compared to the fourth proportional signal (or the fourth transfer function signal V4'). The modified partial discharge comparison signal Vf4' can be output. As a result, the partial discharge detection signal Vf3 generated by the third automatic gain adjustment unit 220 and the partial discharge comparison signal Vf4 generated by the fourth automatic gain adjustment unit 230 indicate whether the partial discharge signal is included in the input signal. It may be output as an analog signal having different values depending on whether or not.

The magnitude noise removal unit 240 generates a noise removal signal from which partial discharge noise is removed based on a comparison signal having a narrow frequency bandwidth compared to the original signal and a signal to be compared whose frequency bandwidth is not changed compared to the original signal. For example, the magnitude noise removal unit 240 may generate a noise removal signal by performing filtering on two input signals based on a reference voltage, and only a portion of the comparison signal and the signal to be compared based on the reference voltage May be buffered, amplified or subtracted to generate a noise removal signal.

The magnitude noise removing unit 240 removes the difference between the comparison signal whose frequency bandwidth is narrow compared to the original signal and the compared signal whose frequency bandwidth is not changed from the original signal, or adds up similar parts to remove components other than the partial discharge as noise. can do. In one embodiment, the magnitude noise removing unit 240 compares the difference between the comparison signal Vf3 whose frequency bandwidth is modulated and the comparison signal Vf4 whose frequency bandwidth is not modulated, determines the similar part as noise, and erases it. , It is possible to obtain the remaining part to generate the noise removal signal Vout(Q) (refer to the graph of FIG. 13).

In one embodiment, the magnitude noise removing unit 240 is a difference amplifier or the partial discharge detection signal that calculates a difference between the comparison signal Vf3 whose frequency bandwidth is modulated and the comparison signal Vf4 whose frequency bandwidth is not modulated. It may be implemented through a differential amplifier differentially amplifying between the and the partial discharge comparison signal. For example, the magnitude noise removal unit 240 generates a magnitude noise reduction signal by subtracting the partial discharge comparison signal from the partial discharge detection signal in order to generate a magnitude noise removal signal, and uses a +5Vdc single power supply as an operating power dipper. It may be implemented as a balance amplifier, or may be implemented as a differential amplifier that differentially amplifies a difference between them based on a reference voltage or any specific voltage to generate a magnitude noise cancellation signal.

In an embodiment, the magnitude noise removal unit 240 may generate a noise removal signal by removing a difference signal through a subtraction operation between the comparison signal Vf3 whose frequency bandwidth is modulated and the comparison signal Vf4 whose frequency bandwidth is not modulated. . In the above embodiment, the comparison signal and the signal to be compared may be exchanged as a signal to be compared and the signal to be compared according to the circuit configuration and intention of the designer.

The magnitude noise removal unit 240 may further include a magnitude noise removal module (not shown) that removes a signal output with an intensity smaller than a specific reference voltage among the output signals to further remove magnitude noise. For example, the magnitude noise removing unit 240 applies a voltage raised according to the occurrence of partial discharge through a magnitude noise removal module implemented including at least one diode to a voltage below a certain specific voltage, reference voltage, or reference voltage. By dropping, a magnitude noise removal signal from which a magnitude noise component is additionally removed may be generated. In an embodiment, the size noise removal unit 141 may variably determine the specific reference voltage for additional removal of the size noise through manual setting by a user or automatic setting through feedback from the control unit 500.

In one embodiment, the magnitude noise removing unit 240 includes a local analog voltage according to a variable resistance manually variable by a user locally, a remote analog voltage provided remotely, or a DAC by remote digital data transmission provided remotely. Digital to Analog Converter) can be manually set based on the output. For example, the magnitude noise removing unit 240 may include an input means for receiving a variable resistance input by a user, and when a variable resistance value is designated by a user locally, the variable resistance is set to the designated variable resistance value. The resulting analog voltage may be determined as the specific reference voltage. For another example, the magnitude noise removal unit 240 is an external partial discharge processing server (not shown) or a partial discharge remotely connected through the network communication module 5 embedded in the partial discharge magnitude pulse acquisition unit 200 A variable resistance value designated by a corresponding user may be received from a processing terminal (not shown).

In one embodiment, the partial discharge magnitude pulse acquisition unit 200 may further include a network communication module 5, and when a partial discharge notification signal is generated, a warning sound is output and connected to a network through the network communication module 5. It is possible to transmit a notification message about the occurrence and information about the waveform to the partial discharge processing server or the partial discharge processing terminal. In addition, the partial discharge magnitude pulse acquisition unit 200 measures the intensity of the partial discharge magnitude signal using the ADC-converted digital signal, and monitors the change in the partial discharge intensity through analysis according to the intensity for each time period to remotely monitor and prevent the facility. It can also be used as a diagnostic device.

12 is a diagram illustrating a size noise removing unit of FIG. 9.

Referring to FIG. 12, the magnitude noise removing unit 240 receives the partial discharge detection signal Vf3 as a first input, receives the partial discharge comparison signal V4 as a second input, and subtracts the second input from the first input. It may be configured as a difference amplifier 820. In one embodiment, the magnitude noise removing unit 240 may function as a subtractor that amplifies the difference in the intensity of the inputs of both inputs to voltage gain 1 using an operational amplifier. In another embodiment, the operational amplifier is used. It can also function as a differential amplifier that amplifies the difference in the strength of the inputs of both inputs with a voltage gain of more than 1 or less than 1.

In one embodiment, the magnitude noise removing unit 240 may receive a partial discharge detection signal and a partial discharge comparison signal through the plurality of resistors 810, for example, the third automatic gain adjustment unit 220 A first resistor 810a disposed between the output terminal of and the first input terminal of the difference amplifier 820 to transmit the third partial discharge detection signal Vf3, the output terminal of the fourth automatic gain adjustment unit 230 and the difference amplifier ( A second resistor 810b disposed between the second input terminals of the 820 and transmitting the fourth partial discharge detection signal Vf4, and a third resistor 810c disposed between the first input and output terminals of the difference amplifier 820 and fed back. ) And a fourth resistor 810d disposed between the second input terminal of the difference amplifier 820 and the ground. In one embodiment, the plurality of resistors 810 may be designed to have the same resistance value within a resistance range of several kohms.

13 is a diagram illustrating a process of acquiring partial discharge amplitude pulses by a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention.

13 exemplarily shows voltage waveforms that are input or output in a process of generating a partial discharge magnitude pulse, a process of generating an output signal of a synchronization comparator, removing a magnitude noise, and acquiring a magnitude pulse.

13, the partial discharge magnitude pulse acquisition unit 200 may receive an input signal Vin through an input port, and the second proportional signal generation unit 210 is a third proportional signal V3 proportional to the intensity of the input signal Vin. And a fourth proportional signal V4 can be generated. For example, among the RF burst signals demodulated to a log value by the second proportional signal generator 210, the part corresponding to the partial discharge signal has a very narrow waveform (for example, an impulse). The proportional signals V3 and V4 may be output, and noise other than the partial discharge may be output as the proportional signals V3 and V4 having a relatively gentle waveform.

As described above, the proportional signal generation unit 111 includes the third and fourth characteristics according to the set reference voltage Vref and the slope of the transfer function (eg, Slope = (VO2-VO1)/(PI2-PI1)). Third and fourth transfer function signals V3' and V4' corresponding to the proportional signals V3 and V4, respectively, may be generated. Here, PI is the strength of the RF burst input seen in the process of generating the corresponding transfer function signal.

The third automatic gain adjustment unit 220 receives the signal V3' whose frequency bandwidth is changed through the partial discharge loop filter module 224 configured with an RC parallel circuit for the input third transfer function signal V3 at the input terminal of the AGC module 222. It transmits to and performs automatic gain adjustment for it, and can output the partial discharge detection signal Vf3 output during the automatic gain adjustment process. The fourth automatic gain adjustment unit 230 may perform automatic gain adjustment through the AGC module 222 according to the lossless feedback of V4' and stably output Vf4. In FIG. 13, when the partial discharge signal is included in the input signal Vin, a partial discharge detection signal Vf3 that is modified compared to the third transfer function signal may be generated, and when the partial discharge-like noise or communication noise is included, it is not substantially modified. A partial discharge comparison signal Vf4 may be generated.

The magnitude noise removing unit 240 removes the magnitude noise of the partial discharge based on the difference between the comparison signal Vf3 whose frequency bandwidth is reduced at V3' and the signal Vf4 having the same frequency bandwidth in V3'. A cancellation signal Vout(q) (denoise) can be output. The magnitude noise removing unit 240 removes the difference between the original signal Vf4 having no change in frequency bandwidth and the same signal Vf4 in the comparison signals Vf3 and V4' whose frequency bandwidth is reduced at V4', or summing the similar portions, other than partial discharge. Components can be removed as magnitude noise. In one embodiment, the magnitude noise removing unit 240 eliminates the difference part through a subtraction operation between the signal to be compared and the signal Vf4 having the same frequency bandwidth from the comparison signals Vf3 and V3' whose frequency bandwidth is reduced at V3'. After that, a partial discharge signal is generated, and using this, the partial discharge outputs a pulse of almost the same size as the original size of the partial discharge. On the other hand, in the case of noise, only the partial discharge signal is intact by outputting significantly less pulses than the original size. Vout(q) (denoise) can be generated by producing pulses of magnitude.

In order to further reduce some of the remaining noise pulse components, the magnitude noise removing unit 240 removes a signal output with an intensity less than a specific reference voltage among the output signals by connecting a forward diode to remove the noise removal signal Vout(q )(denoise) can be completed. The magnitude pulse generator 250 outputs Vout(Q) by performing voltage buffering or stabilizing line output for Vout(q) (denoise).

14 is a diagram illustrating an embodiment of the synchronization comparison unit of FIG. 1.

The synchronization comparison unit 300 is a concept of acquiring a magnitude pulse when generating a timing pulse, and is similar to an AND circuit in that a signal is acquired when synchronization between two pulses is correct. In one embodiment, the synchronization comparison unit 300 may use a combination of an ADC and a microprocessor and an AND circuit or an analog switching circuit to implement the concept. 14 discloses an example of a combination of an ADC and a microprocessor.

In FIG. 14, the synchronization comparison unit 300 may use first, second, and third analog-to-digital converters, respectively, according to the speed of ADC conversion. Here, the first, second, and third analog-to-digital converters may correspond to RF ADCs, high-speed ADCs, and general ADCs, respectively.

In one embodiment, a typical ADC can operate at a sampling rate of up to 1Msps, a high-speed ADC can operate from 250Msps to 1Gsps, and an RF ADC can operate up to several Gsps.

In one embodiment, as shown in (a), in the case of operating an RF ADC, the input RF signal is directly sampled at an RF level without undergoing any other modulation process, and supplied to the synchronization comparison unit 300, and the synchronization comparison unit 300 A pulse with a magnitude of partial discharge corresponding to the magnitude noise removal signal (ie, the value of Vout(Q) at the timing of partial discharge occurrence) can be obtained. In this case, the RF FPGA can be operated and processed in the form of acquiring the partial discharge signal value by referring to the timing of occurrence at the instantaneous Vout(Q) value.

In one embodiment, as shown in (b), in the case of high-speed ADC operation, a signal amplified or attenuated by the variable amplifying unit controlled by the controller 500 is received and passed to the synchronization comparing unit 300 without undergoing a special modulation process. In addition, the synchronous comparison unit 300 may acquire a partial discharge digital signal value at a timing when the partial discharge occurs.

In one embodiment, as shown in (c), in the case of general ADC operation, the input signal is amplified or attenuated according to the control of the synchronous comparison unit 300, modulated with an RF log detection module, and stored in a capacitor. A hold method may be used, and the peak hold value is sampled and transmitted to the synchronization comparing unit 300 to obtain a partial discharge value, and the synchronization comparing unit 300 may reset the peak hold capacitor to prepare the next value. . In this case, the peak hold period, the peak hold hold time, and the reset timing may be determined by the synchronization comparing unit 300. In FIG. 14, Vout (timing) is both provided to the CPU so that the CPU can trigger control the ADC timing. In this case, the CPU can manage the ADC and DAC triggers.

15 is a diagram illustrating a partial discharge signal generator of FIG. 1.

Referring to FIG. 15, the partial discharge signal generator 400 includes a voltage control unit 412, a frequency voltage control RF generator 413, an RF level control unit 414, a voltage control variable RF amplifier 415, and an output level control. It may include a unit 416, a DAC 411 and an RF DAC 417.

In an embodiment, the partial discharge signal generator 400 may selectively operate a circuit configuration connection method (hereinafter, a topology) according to the speed of the DAC. More specifically, the partial discharge signal generator 400 may selectively use the first or second digital-to-analog converter according to the speed of the DAC. Here, the first digital-to-analog converter may correspond to an RF DAC, as shown in (a), and the second digital-to-analog converter may correspond to a general DAC, as shown in (b). RF DAC can directly generate an RF signal of 500Mhz or more without additional topology, and in this case, it can operate an RF FPGA, including Direct Digital Synthesizer (DDS) or SDR (Sortware Define Radio) functions. High-speed RF DAC with simple topology can be operated. A typical DAC can be operated with several Msps.

In one embodiment, in the case of general DAC operation, a frequency voltage control RF generator 413 such as a voltage control oscillator (VCO) can be operated, and in one embodiment, an RF continuous wave of 0dBm 600MHz can be generated, and this device The control voltage of may be supplied from the controller 500 through the voltage controller 412 or controlled by a voltage supplied alone. The generated RF signal is supplied to the voltage-controlled variable RF amplifier 415 with a 600MHz continuous wave having a level size of -30dBm through an RF level control unit 414 such as an attenuator, and the amplification degree of this device is DAC It is controlled by the voltage waveform Vpk supplied from 411 to generate an RF burst. The generated RF burst may be appropriately adjusted by an output level controller 416 such as an attenuator and transmitted as Vout, that is, a reproduced partial discharge RF signal. Vpk is an analog signal, which is a digital signal Vdigital generated by the ADC of the synchronization comparator 300 as an analog value through the DAC 411.

FIG. 16 is an input or output during a process of generating a partial discharge timing pulse and a process of generating a partial discharge amplitude pulse and a noise removal process and a partial discharge signal regeneration or production process of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. It is a diagram showing the voltage waveforms.

In FIG. 16, the broadband lossless partial discharge detection and noise removal apparatus 1000 may receive an input signal Vin through the input port 1. (a) shows a case where a partial discharge signal, a partial discharge similar signal, and communication noise are input as Vin as an example. (b) is an output signal Vout (timing) of the partial discharge timing pulse acquisition unit 100. Looking at Vout (timing), it can be seen that the timing pulse signal is generated at the beginning of the partial discharge signal. (c) denotes an output signal Vout(Q) of the partial discharge magnitude pulse acquisition unit 200. It can be seen that the partial discharge amplitude pulse has almost no change in amplitude in the case of the partial discharge signal, and other noise signals are greatly attenuated. (d) is the DAC 411 output signal Vpk. The output signal of the DAC 411 is output at a portion where the Vout (timing) signal and the Vout (Q) signal overlap each other in the time domain, and the size of the output signal Vout (Q) can be detected. (e) is the output signal Vout of the partial discharge signal generator 400. The partial discharge signal generator 400 receives the ADC (316.317,318) signals, generates a Vpk signal (partial discharge pulse) through a DAC, and generates RF to reproduce the partial discharge signal.

FIG. 17 is an input or output in the process of generating a partial discharge timing pulse and generating a partial discharge amplitude pulse, a noise removal process, and a partial discharge signal regeneration or production process of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. As a diagram illustrating the voltage waveforms, in particular, as they have the same rising time as the partial discharge, they illustrate the noise removal process for the communication burst noise containing the internal sudden change signal that could not be removed with the previous technology. 17, for example, in particular, communication noise such as an LTE signal has a signal region showing a rising time such as a partial discharge inside, and shows an exemplary noise removal process of this part.

In FIG. 17, the broadband lossless partial discharge detection and noise removal apparatus 1000 may receive an input signal Vin through the input port 1. (a) shows a case where a partial discharge signal, a partial discharge similar signal, and communication noise are input as Vin as an example. (b) is an output signal Vout (timing) of the partial discharge generation timing pulse acquisition unit 100. Looking at Vout (timing), it can be seen that the timing pulse signal is generated inside the communication noise and the beginning of the partial discharge signal. (c) is the output signal Vout(Q) of the partial discharge magnitude pulse acquisition unit 200. It can be seen that the partial discharge amplitude pulse has almost no change in amplitude in the case of the partial discharge signal, and other noise signals are greatly attenuated. In addition, in the case of the communication noise region, it can be seen that the timing pulse Vout (timing) and the magnitude pulse Vout (Q) are not synchronized with each other in the time domain. (d) is the DAC 411 output signal Vpk. It can be seen that the output signal Vpk of the DAC 411 is output at a portion where the Vout (timing) signal and the Vout (Q) signal overlap each other in the time domain, and the magnitude of the output signal Vout (Q) is detected. In particular, in the case of the communication noise region, since Vout (timing) and the magnitude pulse Vout (Q) are not synchronized in the time domain, it can be seen that there is no output in this region, thereby removing the noise. (e) is an output RF signal Vout of the partial discharge signal generator 400. The partial discharge signal generator 400 receives the signals from the ADCs 316.317 and 318, generates a Vpk signal (partial discharge pulse) through the DAC, and generates RF to reproduce the partial discharge signal.

FIG. 18 is a diagram illustrating a process of converting a partial discharge signal to a noise signal according to a traveling distance of a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention, and an embodiment of partial discharge detection based on a constant distance relationship. It is a drawing.

More specifically, FIG. 18 is a partial discharge timing pulse generation process and a partial discharge amplitude pulse generation process and a noise removal process and a partial discharge signal regeneration or production process of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. As a diagram illustrating voltage waveforms that are input or output from, in particular, a process in which a partial discharge signal is converted into a noisy signal according to a traveling distance and a partial discharge detection embodiment according to a constant distance relationship are illustrated. That is, in the past, since the detection was performed regardless of the distance, it was not possible to control the distance relationship, but the broadband lossless partial discharge detection and noise removal apparatus 1000 according to the present invention exemplifies that the detection distance can be controlled. FIG. 18 shows a change of a partial discharge signal according to a distance from a source, and accordingly, a signal processing process according to the present invention, that is, a process of processing even a partial discharge signal as noise in the case of a predetermined distance or more.

18, the broadband lossless partial discharge detection and noise removal apparatus 1000 may receive an input signal Vin through the input port 1. (a) shows a case where a partial discharge signal changed according to distance is input to Vin. (b) is an output signal Vout (timing) of the partial discharge generation timing pulse acquisition unit 100. Looking at Vout (timing), it can be seen that the partial discharge generation timing pulse is generated at a certain short distance from the generator and is recognized as noise after a certain distance. In one embodiment, the control unit 500 receives the pulse count from the timing pulse generator 150 and controls the variable amplifier/variable attenuator 160 to control the timing pulse generation sensitivity to perform control on the distance relationship. have. (c) denotes an output signal Vout(Q) of the partial discharge magnitude pulse acquisition unit 200. It can be seen that the magnitude pulse has almost no magnitude change in the case of the partial discharge signal and is output in the form of a pulse. When moving away from the partial discharge generation source, the partial discharge generation timing pulse does not occur even if the partial discharge magnitude pulse occurs. In this case, it can be seen that the partial discharge generation timing pulse Vout (timing) and the partial discharge magnitude pulse Vout (Q) are not synchronized with each other in the time domain. (d) is the output signal Vpk of the DAC 411. The output signal Vpk of the synchronization comparator 300 is output at a portion where the Vout (timing) signal and the Vout (Q) signal overlap each other in the time domain, and the magnitude of the Vout (Q) can be detected. When the distance from the source of partial discharge increases, the Vout (timing) and the magnitude pulse Vout (Q) are not synchronized in the time domain or there is no common area on the time axis, so there is no output in this area, and the distance is increased. The discharge signal can be treated as noise and removed. (e) is the output signal Vout of the partial discharge signal generator 400. The partial discharge signal generator 400 receives the signals from the ADCs 316.317 and 318, generates a Vpk signal (partial discharge pulse) through the DAC, and generates RF to reproduce the partial discharge signal.

FIG. 19 is an input or output in the process of generating a partial discharge timing pulse and generating a partial discharge amplitude pulse, a noise removal process, and a partial discharge signal reproduction or production process of the broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention. As a diagram illustrating the voltage waveforms, in particular, a diagram showing a process of converting a partial discharge signal into a noise signal according to a traveling distance and an embodiment of partial discharge detection based on a constant distance relationship from different partial discharge sources.

19 shows an embodiment of the partial discharge detection distance control by the distance relation control of the broadband lossless partial discharge detection and noise removal apparatus 1000. In FIG. 19, two different partial discharge generators A and B are shown as examples, and it is shown that the detection distance between the two sources can be adjusted so as not to overlap. That is, FIG. 19 shows a process of processing the partial discharge signal as noise when the distance between the broadband lossless partial discharge detection and noise removal apparatus 1000 and the partial discharge generation source is separated by a predetermined distance or more.

In FIG. 19, the lossless partial discharge detection and noise removal apparatus 1000 may receive an input signal Vin through the input port 1. (a) and (c) exemplify the change in the distance relationship between partial discharge signals generated from different sources and propagating in different directions. (b) and (d) show the acquisition and output of the modified signal according to the distance relationship of the partial discharge signal generated from the two sources. The partial discharge signals in (a) and (c) are in the overlapping range, but the partial discharge detection and output signals in (c) and (d) do not overlap. In an embodiment, the lossless partial discharge detection and noise removal apparatus 1000 may identify a direction and a distance for each generation source by controlling a distance relationship.

FIG. 20 is a method of controlling air corona noise by a distance relation control method of a broadband lossless partial discharge detection and noise removal system including a broadband lossless partial discharge detection and noise removal device according to an embodiment of the present invention. It is a diagram showing an embodiment of a method for removing noise by comparing between channels and a method for performing remote monitoring.

In FIG. 20, three different types of partial discharge generation sources (a, b, c) are illustrated as examples, and different sensors (UHF noise sensor, HFCT sensor, UHF PD sensor) are illustrated as examples, and at least one broadband lossless partial discharge A data acquisition device and a remote HMI (Human Machine Interface) device having a detection and noise removal device 1000 therein are shown as examples.

In FIG. 20, a broadband lossless partial discharge detection and noise removal system 2000 includes a plurality of partial discharge generating sources that are located at a certain distance from each other and generate partial discharge signals mixed with noise, each of the plurality of partial discharge generating sources. A data acquisition device for dividing and acquiring a partial discharge signal from a plurality of partial discharge sensors disposed in the plurality of partial discharge sensors and a partial discharge signal in which noise detected through the plurality of partial discharge sensors is mixed, wherein the data acquisition device includes partial discharge A partial discharge generation timing pulse acquisition unit that acquires a partial discharge signal generation timing pulse at the beginning of the signal generation, a partial discharge amplitude pulse acquisition unit that acquires the amplitude pulse of the partial discharge signal, the generation timing pulse of the partial discharge signal, and A synchronization comparison unit for detecting a partial discharge digital signal determined according to synchronization of the magnitude pulses, and a partial discharge signal generator for detecting partial discharge pulses obtained by converting the detected partial discharge digital signal into an analog signal. A plurality of broadband lossless partial discharge detection and noise removal devices may be included. In one embodiment, the data acquisition device is the timing pulse for the partial discharge signal of another partial discharge generator detected by a specific partial discharge generator among the plurality of partial discharge generators through a plurality of broadband lossless partial discharge detection and noise removal devices. It is possible to determine whether or not to synchronize the magnitude pulses in the time domain and to remove the partial discharge signal of the other partial discharge generator as noise based on the synchronization or not to detect only the partial discharge signal of the specific partial discharge generator. For example, the broadband lossless partial discharge detection and noise removal system 2000 (a) acquires an air corona with a UHF noise sensor, (b) acquires a bushing partial discharge signal with an HFCT sensor, and (c) an internal part of the transformer. The discharge signal can be acquired by the UHF PD sensor and the input signal Vin can be received. In one embodiment, the data acquisition device can communicate with the remote HMI device via the network communication module 5. (a) The airborne corona can propagate inside the transformer along the track, and (c) it can be mixed with the internal partial discharge signal and acquired by the UHF PD sensor. In this case, when controlling with pulse count feedback to the variable amplification/attenuator 160 through the control unit 500 by applying the distance relation control embodiment of FIG. 19, the air corona signal entering from the outside among the mixed signals is When attenuated and turned into a noisy signal, the air corona signal is not detected because it does not generate a timing pulse, and only an internal partial discharge signal generated internally can be detected. In an embodiment, in order to further remove the air corona when the attenuation of the air corona signal is not large, in one embodiment, timing pulses of both signals are detected when the air corona signal as well as the internal partial discharge signal is captured in the UHF PD sensor of (c). At this time, only the internal partial discharge signal can be detected by (a) acquiring the air corona timing pulse generation with the UHF noise sensor and removing the common part of (a) in (c) above. In one embodiment, since the broadband lossless partial discharge detection and noise removal device 1000 has a broadband characteristic without using a filter, an HFCT sensor having a bandwidth of 100 MHz or less and a UHF sensor having a bandwidth of 300 MHz to 2000 MHz are simultaneously simultaneously Because it can be used, three types of sensors (UHF noise sensor, HFCT sensor, UHF PD sensor) can be used at the same time. In one embodiment, the method of removing the influence of the air corona or the internal partial discharge in the bushing partial discharge and purely detecting only the bushing partial discharge signal is the same as the method of removing the air corona effect between (a)-(c). With the previous technology, it was not possible to measure HFCT (1 to 100 MHz) at the same time in narrow band or band limit (500 MHz to 1500 MHz), but if you use the present invention, it is possible to measure in the entire band, so other noise in the signal mixed in the ground current of the bushing ( Only the bushing partial discharge signal can be acquired without the influence on air corona, internal partial discharge). The acquisition method is a distance relation method as described above, and a channel comparison method can be used to further increase performance.

FIG. 21 is a diagram illustrating an experiment result of removing noise and detecting partial discharge through a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention.

Referring to FIG. 21, the partial discharge detection system 900 may include an electrical equipment 910, a partial discharge sensor 920, a broadband lossless partial discharge detection and noise removal device 1000, and an output device 930. .

The electric equipment 910 may correspond to a power equipment device that performs at least one of electric power, power generation, electric conversion, electricity supply, and electric control. For example, the electrical equipment 910 may correspond to a cable partial discharge device including a solid insulation switchgear (SIS). In FIG. 8, the electric equipment 910 is shown in the form of a gas insulated switch, but may correspond to a battery, an inverter, a power motor, a charger for an electric vehicle, a transformer, or a cable on an electric vehicle. (Ultra High Frequency) may correspond to a related device.

The partial discharge sensor 920 may be combined with the ground line of the electrical equipment 910 and may be implemented as a CT (Current Transformer) that detects electromagnetic waves generated from the electrical equipment 910 and converts them into current, and is a broadband lossless. The partial discharge detection and noise removal device 1000 receives the converted current from the partial discharge sensor 920 as an input signal, generates a partial discharge timing signal based on the corresponding input signal, and detects only the partial discharge signal, resulting in partial discharge. Detection can be performed.

The output device 930 may be connected to the partial discharge generation timing pulse acquisition unit 100, and processes signals received from the broadband lossless partial discharge detection and noise removal device 1000 to process the signals received from the PRPD (Phase Resolved Partial Discharge) or PRPS ( Phase Resolved Pulse Sequence). In one embodiment, the output device 930 is a digital conversion module capable of converting the analog signals received from the partial discharge generation timing pulse acquisition unit 100 into a digital signal, and is implemented to be programmable based on the converted digital signal. It may be implemented through at least one of a field-programmable gate array (FPGA), a PC board that processes signals received from the FPGA, and a display module that visually outputs the processed signals.

22 is an output result showing a result of detecting whether a partial discharge has occurred by actually implementing a broadband lossless partial discharge detection and noise removal apparatus according to an embodiment of the present invention (channel B) compared with a conventional technology (channel A) It is a graph.

In FIG. 21, as described above, the broadband lossless partial discharge detection and noise removal device 1000 is implemented as an actual equipment and provides a target signal as an input signal from the partial discharge sensor 920 connected to the electrical equipment 910 of the SIS equipment. The input/output signal may be visualized through the output device 930 by detecting whether a partial discharge signal is included by processing the provided input signal.

In FIG. 22, in the graph shown, channel A represents the input signal Vin provided from the partial discharge sensor 920 without passing through the apparatus of the present invention, and channel B represents the input signal Vin provided from the partial discharge sensor 920. It is a comparative graph shown through the apparatus of the present invention. It can be seen that the partial discharge generation timing pulse acquisition unit 100 according to an embodiment of the present invention suppresses noise in the provided input signal Vin and detects with high accuracy whether the partial discharge signal is included.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can do it.

1000: Broadband lossless partial discharge detection and noise removal device
100: partial discharge generation timing pulse acquisition unit
200: partial discharge magnitude pulse acquisition unit
300: synchronization comparison unit
400: partial discharge signal generator
500: control unit
110: first proportional signal generation unit
120: first automatic gain adjustment unit 130: second automatic gain adjustment unit
140: timing noise removal unit
150: timing pulse generator
210: second proportional signal generation unit
220: third automatic gain control unit 230: fourth automatic gain control unit
240: size noise removal unit
250: magnitude pulse generator

Claims (29)

A partial discharge generation timing pulse acquisition unit for acquiring a partial discharge signal generation timing pulse at the beginning of the partial discharge signal generation;
A partial discharge magnitude pulse acquisition unit that acquires the magnitude pulse of the partial discharge signal;
A synchronization comparator for detecting a partial discharge digital signal determined according to synchronization between the generation timing pulse of the partial discharge signal and the magnitude pulse; And
A partial discharge signal generator for detecting a partial discharge pulse obtained by converting the detected partial discharge digital signal into an analog signal,
The synchronization comparison unit
Broadband lossless partial discharge, characterized in that when the timing pulse and the magnitude pulse of the partial discharge signal are synchronized in the time domain, the corresponding pulse is detected as the partial discharge pulse, and if not synchronized, the corresponding pulse is determined as noise and removed. Detection and noise cancellation device.
The method of claim 1, wherein the partial discharge signal generator
A broadband lossless partial discharge detection and noise removal device, characterized in that to reproduce or generate a partial discharge signal through the detected partial discharge pulse.
The method of claim 1, wherein the partial discharge generation timing pulse acquisition unit
A first proportional signal generator that generates first and second proportional signals according to the input signal;
A first automatic gain adjustment unit for performing automatic gain adjustment on a partial discharge detection signal generated based on the first proportional signal and fed back to an input terminal through at least one partial discharge capacitor;
A second automatic gain adjustment unit for performing automatic gain adjustment based on a partial discharge comparison signal generated based on the second proportional signal and fed back to an input terminal;
A timing noise removal unit generating a timing noise removal signal from which timing noise is removed based on the partial discharge detection signal and the partial discharge comparison signal; And
A wideband lossless partial discharge detection and noise removal apparatus comprising a timing pulse generator for acquiring a partial discharge generation timing pulse.
The method of claim 3, wherein the partial discharge magnitude pulse acquisition unit
A second proportional signal generator that generates third and fourth proportional signals according to the input signal;
A third automatic gain adjustment unit for performing automatic gain adjustment on the partial discharge detection signal generated based on the third proportional signal and fed back to the input terminal through at least one partial discharge capacitor;
A fourth automatic gain adjustment unit for performing automatic gain adjustment based on the partial discharge comparison signal generated based on the fourth proportional signal and fed back to the input terminal;
A magnitude noise removal unit generating a magnitude noise removal signal from which magnitude noise is removed based on the partial discharge detection signal and the partial discharge comparison signal; And
A broadband lossless partial discharge detection and noise removal apparatus comprising a magnitude pulse generator for acquiring partial discharge magnitude pulses.
The method of claim 4, wherein the first automatic gain adjustment unit
If the partial discharge signal is reflected in the partial discharge detection signal by feeding back the amplitude or frequency intensity of the partial discharge detection signal through the at least one partial discharge capacitor to the input terminal, at the beginning of the partial discharge occurrence in the process of the automatic gain adjustment A broadband lossless partial discharge detection and noise removal device, characterized in that to induce a temporary change in a voltage gain adjustment factor (voltage amplification degree or slope characteristic of an output voltage) starting.
The method of claim 4, wherein the first automatic gain adjustment unit
Broadband lossless partial discharge detection and noise, characterized in that a specific frequency band is filtered from the partial discharge detection signal through at least one partial discharge capacitor connected to the output terminal at one end and grounded at the other end and fed back to a corresponding automatic gain adjustment process. Removal device.
The method of claim 4, wherein the third automatic gain adjustment unit
A partial discharge loop filter module configured to adjust a frequency bandwidth of the partial discharge detection signal input to the input terminal through the at least one partial discharge capacitor and at least one partial discharge resistor connected to one end of the at least one partial discharge capacitor. Broadband lossless partial discharge detection and noise removal device, characterized in that.
The method of claim 6, wherein the first automatic gain adjustment unit
Broadband lossless partial discharge detection and noise removal, characterized in that the frequency bandwidth is adjusted through a low pass filter (LPF) or a high pass filter (HPF) implemented through a combination of at least two of a capacitor, an inductor, a resistor, and an amplifier. Device.
The method of claim 4, wherein the timing noise removing unit and the magnitude noise removing unit
Broadband lossless partial discharge detection and noise, characterized in that the difference between the partial discharge detection signal and the partial discharge comparison signal is eliminated or a component other than the partial discharge is removed as the timing noise and the magnitude noise, respectively, by summing a similar part. Removal device.
The method of claim 7, wherein the timing noise removing unit and the magnitude noise removing unit
Implemented through a difference amplifier that calculates a difference between the partial discharge detection signal and the partial discharge comparison signal, or a differential amplifier differentially amplifies the partial discharge detection signal and the partial discharge comparison signal. Broadband lossless partial discharge detection and noise removal device, characterized in that.
The method of claim 10, wherein the timing pulse generator
A broadband lossless partial discharge detection and noise removal device, characterized in that the differential amplifier or the partial discharge signal obtained from the differential amplifier is converted into a TTL (Transistor Transistor Logic) pulse to generate a partial discharge generation timing pulse.
The method of claim 4, wherein each of the first proportional signal generation unit and the second proportional signal generation unit
It is implemented through at least one of a log detector, an amplifier, an envelope detector, and an integrator that demodulates the log value of the input signal, or through a combination of at least two. Broadband lossless partial discharge detection and noise removal device characterized by.
The method of claim 4, wherein each of the timing noise removing unit and the magnitude noise removing unit
And a noise removal module each further comprising a noise removal module for removing a signal output with an intensity smaller than a specific reference voltage among the output signals to further remove the timing noise and the magnitude noise.
The method of claim 13, wherein each of the timing noise removing unit and the magnitude noise removing unit
A broadband lossless partial discharge detection and noise removal device, characterized in that the specific reference voltage is determined through manual setting by a user or automatic setting through internal or remote feedback.
The method of claim 14, wherein each of the timing noise removing unit and the magnitude noise removing unit
The manual setting is set based on a local analog voltage according to a variable resistance manually variable by a user locally, a remote analog voltage provided remotely, or a digital to analog converter (DAC) output by remote digital data transmission provided remotely. Broadband lossless partial discharge detection and noise removal device, characterized in that performing.
The method of claim 14, wherein the timing noise removing unit
(a) a low-pass filter disposed at the output terminal to filter the timing noise removal signal, and (b) the minimum, average or maximum value of the filtered timing noise removal signal is detected through ADC conversion and digital calculation, and the detection value is And a feedback module for automatically setting the specific reference voltage by feeding back until convergence within a specific reference range.
The method of claim 4,
A controller configured to control a variable amplifier or a variable attenuator by receiving a pulse count from the timing pulse generator to control a variable amplifier or a variable attenuator to control the sensitivity of the partial discharge generation timing pulse to control a distance relationship with the source of the partial discharge signal; And
Broadband lossless partial discharge detection and noise removal device, characterized in that it further comprises a network communication module that communicates with the HMI (Human Machine Interface) locally or remotely.
delete The method of claim 1, wherein the synchronization comparison unit
Broadband lossless partial discharge detection and noise removal device, characterized in that the synchronization is determined variably according to the distance from the source of the partial discharge signal.
The method of claim 19, wherein the synchronization comparison unit
When the distance increases by more than a predetermined reference, it is determined that the timing pulse and the magnitude pulse are not synchronized in a time domain, and the partial discharge signal is removed as noise.
The method of claim 1, wherein the synchronization comparison unit
Analog-to-digital conversion of the partial discharge magnitude pulse signal by using the partial discharge generation timing pulse as a trigger, and selectively using a first, second, or third analog-to-digital converter according to the speed of the analog-digital conversion. Broadband lossless partial discharge detection and noise removal device characterized by.
The method of claim 21, wherein the first analog-to-digital converter
A broadband lossless partial discharge detection and noise removal device, characterized in that the input RF (Radio Frequency) signal is sampled directly at an RF level without undergoing a modulation process to obtain the partial discharge signal.
The method of claim 21, wherein the second analog-to-digital converter
A broadband lossless partial discharge detection and noise removal apparatus, characterized in that the partial discharge signal is obtained by receiving a signal amplified or attenuated by a variable amplification unit controlled by the synchronization comparison unit without undergoing a special modulation process and sampling at high speed.
The method of claim 21, wherein the third analog-to-digital converter
Broadband lossless partial discharge detection, characterized in that the partial discharge signal is obtained by sampling the peak hold value calculated through a peak hold method in which an input signal is amplified or attenuated and modulated with an RF log detection module to store the maximum value in a capacitor. And noise canceling device.
The method of claim 1, wherein the partial discharge signal generator
A broadband lossless partial discharge detection and noise removal apparatus, characterized in that it selectively uses first and second digital-to-analog converters for variably determining the topology of each circuit configuration according to a digital-to-analog conversion speed.
The method of claim 25, wherein the second digital to analog converter
Frequency voltage control RF generator;
An RF level control unit for adjusting an RF signal generated by the RF generator;
An RF amplifier amplifying the adjusted RF signal; And
A broadband lossless partial discharge detection and noise removal apparatus further comprising an output level control unit for generating a partial discharge signal by controlling the generation of the RF burst by the amplification.
A plurality of partial discharge generators, each of which is located at a predetermined distance from each other, and generating partial discharge signals mixed with noise;
A plurality of partial discharge sensors disposed at each of the plurality of partial discharge generating sources; And
A data acquisition device for dividing and obtaining a partial discharge signal from a partial discharge signal mixed with noise detected through the plurality of partial discharge sensors,
The data acquisition device
Partial discharge generation timing pulse acquisition unit acquiring a partial discharge signal generation timing pulse at the beginning of generation of the partial discharge signal, partial discharge amplitude pulse acquisition unit acquiring the amplitude pulse of the partial discharge signal, and the generation timing of the partial discharge signal A synchronization comparator for detecting a partial discharge digital signal determined according to synchronization between a pulse and the magnitude pulse, and a partial discharge signal generator for detecting a partial discharge pulse obtained by converting the detected partial discharge digital signal into an analog signal. Including a plurality of broadband lossless partial discharge detection and noise removal devices that include, but through the plurality of broadband lossless partial discharge detection and noise removal devices, another partial discharge generator detected from a specific partial discharge generator among the plurality of partial discharge generators It is determined whether the timing pulse and the magnitude pulse are synchronized in the time domain of the partial discharge signal, and based on the synchronization, the partial discharge signal of the other partial discharge generator is removed as noise, Broadband lossless partial discharge detection and noise removal system, characterized in that only detecting the discharge signal.
delete The method of claim 27, wherein the plurality of broadband lossless partial discharge detection and noise removal devices
A broadband lossless partial discharge detection and noise removal system, characterized in that a plurality of sensors having different bandwidths having a broadband characteristic without using a filter are used simultaneously.

Images