KR102059796B1 - Apparatus for acquiring partial discharge timing signal and system for suppressing partial discharge noise and detecting patial discharge including the same - Google Patents

Abstract

The present invention relates to a partial discharge timing signal acquisition device which comprises: a proportional signal generation unit generating first and second proportional signals in accordance with an input signal; a first automatic yield adjustment unit performing automatic yield adjustment with respect to a partial discharge detection signal which is generated based on the first proportional signal and is fed back to an input end through at least one partial discharge capacitor; a second automatic yield adjustment unit performing automatic yield adjustment based on a partial discharge comparison signal which is generated based on the second proportional signal and is fed back to the input end; 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 timing signal generation unit acquiring a partial discharge generation timing. According to a test result, the generation timing is generated upon generation of a partial discharge signal period when the partial discharge signal is generated, that is, the timing signal is generated at a point of time when generation is started, thereby precisely processing noise and acquiring partial discharge. Moreover, the present invention is intended to attain the effect thereof with a timing result.

Description

Partial discharge timing signal acquisition device and partial discharge noise suppression and signal processing system including same {APPARATUS FOR ACQUIRING PARTIAL DISCHARGE TIMING SIGNAL AND SYSTEM FOR SUPPRESSING PARTIAL DISCHARGE NOISE AND DETECTING PATIAL DISCHARGE INCLUDING THE SAME}

The present invention relates to acquiring a partial discharge generation timing signal and a partial discharge noise suppression and signal processing technique using the same, and more particularly, a conventional ultra short filter method and / or a rear high speed in a partial discharge signal and a mixed input signal. Unlike the software processing method, the PANA-timing method of the shortest stage detects the timing of occurrence of partial discharge and removes the signal that is not related to the timing generation. The present invention relates to a partial discharge timing signal acquisition device capable of detecting a partial discharge signal more effectively, and to a partial discharge noise suppression and partial discharge signal processing system including the same.

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

The conventional partial discharge diagnosis technique using electromagnetic waves has been applied to the partial discharge diagnosis of the power cable using the HFCT, the partial discharge diagnosis of the power equipment using the UHF sensor, the partial discharge diagnosis of the electric vehicle using the HFCT and UHF hybrid sensor.

The method for detecting the occurrence of partial discharge by using the electromagnetic wave includes a large amount of other noises in the process of detecting the partial discharge, and the partial discharge signal similar to the partial discharge generated due to the partial discharge and the partial discharge property similar to the partial discharge. It is difficult to distinguish noise or communication noise precisely, so the reliability of partial discharge diagnosis is remarkably inferior.

The partial discharge signal input through the sensor shows a burst form of high frequency pulses with a pulse width of several nS, and there is no standard pattern. The partial discharge noise cluster (Burst) or the communication noise cluster (Burst), which is similar to the partial discharge signal, has a part different from the pulses constituting the group of the partial discharge signal in the cluster. However, especially in the field of cable partial discharge, detecting the cable partial discharge is not easy because the noise is very similar to the partial discharge and the signal strength is relatively high.

Conventional partial discharge noise removal techniques include filtering technology, noise gating technology, speed difference noise removal technology, and the like. In particular, the band rejection filtering technology has a limitation of noise removal due to broadband partial discharge characteristics. Was not practical because it could not distinguish between noise and partial discharge, and the speed difference noise removal technique was very fast among noise, and there was an error to recognize this as partial discharge. .

Korean Patent Registration No. 10-1496442 (2015.02.17) relates to a device for diagnosing a partial discharge of a cable, a detection sensor for detecting a partial discharge signal of a cable, a band pass filter for filtering out noise of the detection sensor, and the band An amplifier for amplifying the output signal of the pass filter, a frequency tuning filter for tuning the frequency of the output signal of the amplifier, an envelope detector for measuring the length and shape of the output signal of the frequency tuning filter, the magnitude of the output signal of the envelope detector A peak detector for measurement, and an analog digital signal converter for converting the output signal of the peak detector into a digital signal, the partial discharge to distinguish the noise and PD by checking the length and shape of the output signal of the analog digital signal converter Output signal of the signal detector and the partial discharge signal detector through PRPD mapping It further includes a partial discharge pattern analysis unit for checking the type of partial discharge, the detection sensor is an HF sensor or HFCT sensor, the measurement range is 5MHz ~ 200MHz for the HF sensor, the measurement range is 1MHz ~ 100MHz for the HFCT sensor The band pass filter may be a band pass filter having a pass band of 1 MHz to 200 MHz, and the frequency tuning filter may include a signal generator that generates a signal having a frequency of 200 MHz to 420 MHz, and passes through the amplifier. A mixer and a mixer outputting a signal having a frequency corresponding to a sum and a frequency corresponding to the sum of the output signal of the amplifier and the output signal of the signal generator by mixing a signal generated by the signal generator together A narrowband band pass filter for filtering signals into a narrowband having a center frequency of 425 MHz Bandwidth of 20 MHz is included.

The technique has a disadvantage in that the partial discharge signal is filtered due to the application of a narrowband band pass filter to remove noise, and thus the partial discharge is not properly detected. Moreover, even though a band pass filter is applied, the "partial discharge signal detection unit which distinguishes noise from PD" proves that noise is introduced. The above technique has a disadvantage in that it is economical because an additional high-speed ADC and software computing process are required to distinguish noise and partial discharge signals.

Korean Patent Registration No. 20-0435061 (December 29, 2006) relates to a partial discharge counter for diagnosing a gas insulated switchgear. Frequency conversion means for converting the low frequency signal using the peak holding circuit 21-c and the peak reset circuit 21-d, and the signal output by the frequency conversion means from the ADC 22 to AD; And a synchronization circuit for converting and matching the converted value to the frequency of the phase voltage.

The technique also has a disadvantage in that the partial discharge signal is not properly detected because the bandpass filter is applied to remove noise from the input signal. Since the peak detection circuit is applied, when a noise larger than the partial discharge signal is introduced into the band pass filter, the noise signal may be recognized as a partial discharge and counted.

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

Partial discharge prevention diagnosis is an essential part of human safety and facility maintenance.

Partial discharge prevention diagnosis method using electromagnetic waves is preferred because it shows the best results, but as new communication service is continuously introduced, noise cannot be removed by filter mounting method and noise and partial discharge through high speed operation Although there have been attempts to distinguish the characteristics of the field, the practical application in the field has limited application areas because noise is not properly filtered, bulky and economical.

Therefore, there is a limit in the noise removal of the conventional filter mounting and the high speed software processing method, so a method that can remove the noise economically and efficiently without the use of the filter and the high speed software is needed.

The partial discharge signal has a burst shape of a high frequency pulse having a pulse width of several nS, and is different from the partial discharge noise or communication noise similar to other partial discharge signals, but it is easy to distinguish the partial discharge noise from the partial discharge noise, especially in the cable partial discharge field. not.

The present invention has been made to solve the above problems.

According to an embodiment of the present invention, by accurately acquiring a timing of generating partial discharges, only partial discharge signals are detected, thereby effectively suppressing noise and detecting partial discharges.

The present invention is a PANA-timing noise cancellation circuit that applies PANA (Patial Discharge Amplification Noise Attenuation) technology (Korean Patent Application No. 10-2017-0134573) to take a partial discharge signal from an input signal in which noise is mixed. The detection eliminates the need for filter mounting and eliminates the need for high-speed computation, making it economical and compact, which can be used in various applications.

One embodiment of the present invention is to provide a partial discharge noise suppression and signal processing apparatus that can effectively detect whether or not a partial discharge signal is included in the input signal.

In the process of detecting the partial discharge signal, although the noise suppression having the characteristic of acquiring and analyzing a signal of -65 dBm or less which is a very fine signal is an important factor that determines the success or failure of the partial discharge signal detection, the partial discharge detection When various signal bands overlap in the band, it is difficult to suppress such noise by any conventional technology because of the similar partial discharge signal very similar to the partial discharge signal.

Since all signals including noise have a constant signal width, only partial discharge can be detected if only timing of partial discharge occurrence can be accurately detected, thereby suppressing noise.

According to an embodiment of the present invention, the partial discharge signal can be reproduced by purely acquiring the partial discharge signal by measuring the partial discharge magnitude almost simultaneously with acquiring the timing of occurrence of the partial discharge, and using the same in various apparatuses. .

Among the embodiments of the present invention, there may be an active partial discharge detection sensor module having a noise canceling function by acquiring the partial discharge generation timing and measuring the magnitude of the partial discharge to reproduce and transmit the partial discharge signal. In addition, the present invention can be applied to the ultra-short circuit of the partial discharge monitoring device and may also be used as a noise removing module in front of the spherical device input terminal.

In example embodiments, the apparatus for acquiring partial discharge timing signals may include a proportional signal generator configured to generate first and second proportional signals according to an input signal, and are generated based on the first proportional signal and provided to an input terminal through at least one partial discharge capacitor. A first automatic gain control unit for performing the automatic gain control on the feedback signal to the partial discharge detection, the second automatic gain adjustment based on the partial discharge comparison signal generated based on the second proportional signal and fed back to the input terminal An automatic gain adjusting unit, a timing noise removing unit generating a timing noise removing signal from which timing noise has been removed based on the partial discharge detecting signal and the partial discharge comparing signal, and a timing signal generating unit obtaining the partial discharge generation timing.

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 to the input terminal through the at least one partial discharge capacitor, the first automatic gain adjustment process We can derive the transient and amplified outputs (which are proportional to the input signal and output relation).

The first automatic gain adjusting unit may be a part of a commercially available log amplifier, and the transient over-amplification may be obtained by a temporary change in the output slope characteristic of the log amplifier.

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

The first automatic gain control unit may include at least one partial discharge resistor connected to one end of the at least one partial discharge capacitor, and perform the feedback through the at least one partial discharge capacitor and the at least one partial discharge resistor. Can be.

The first automatic gain control unit may perform the feedback through a low pass filter (LPF) or a high pass filter (HPF) implemented through at least two combinations of a capacitor, an inductor, a resistor, and an amplifier.

The timing noise removing unit may remove or add components similar to or different between the partial discharge detection signal and the partial discharge comparison signal to remove components other than the partial discharge as the noise.

The timing noise removing unit may include a differential amplifier calculating a difference between the partial discharge detection signal and the partial discharge comparison signal or a differential amplifier differentially amplifying the partial discharge detection signal and the partial discharge comparison signal. ) Can be implemented.

The proportional signal generator may be configured to pass through at least one of a log detector, an amplifier, an envelope detector, and an integrator that demodulates a log value of the input signal. It can be implemented through.

The timing noise removing unit may further include a noise removing module for removing a signal output at an intensity less than a specific reference voltage among the output signals in order to further remove the noise.

The timing noise removing unit may determine the specific reference voltage through manual setting by a user or automatic setting through internal feedback.

The timing noise canceller is based on a local analog voltage according to a variable resistor manually changed by a user locally, a remote analog voltage provided remotely, or a digital to analog converter (DAC) output by remotely provided remote digital data transmission. The manual setting can be performed.

The timing noise canceling unit (a) a low pass filter disposed at an output terminal to filter the noise canceling signal, and (b) the lowest, average or highest value of the filtered noise canceling signal is detected through ADC conversion and digital calculation. It may include a feedback module for automatically setting the specific reference voltage by feeding back until the detection value converges within a specific reference range.

The timing signal generator may further generate a partial discharge generation timing signal by TTL-pulsing the partial discharge signal obtained from the differential amplifier or the differential amplifier of the timing noise remover.

The TTL pulsed method may be further implemented using a comparator or through analog to digital conversion.

In one or more embodiments, the partial discharge noise suppression and signal processing system may include a partial discharge timing signal acquisition device configured to acquire a partial discharge generation timing immediately at the beginning of a signal period when the partial discharge signal is generated; and determine the magnitude of the partial discharge signal immediately after acquiring the partial discharge generation timing. A partial discharge signal acquisition unit; a control unit controlling an operation between the partial discharge timing signal acquisition device and the partial discharge signal acquisition unit; And a partial discharge signal generator which measures the magnitude of the partial discharge signal and reproduces or produces the partial discharge signal from which the noise is removed to be equal to the input partial discharge signal size, wherein the partial discharge timing signal acquisition device is provided with an input signal. A proportional signal generator for generating first and second proportional signals according to the present invention, and performing automatic gain control 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 first automatic gain adjuster, a second automatic gain adjuster configured to perform automatic gain adjustment based on the partial discharge comparison signal generated based on the second proportional signal and fed back to an input terminal, the partial discharge detection signal and the partial discharge Timing noise to generate a timing noise cancellation signal with timing noise canceled based on the comparison signal It includes parts of rejected parts and generates a timing signal for acquiring the discharge generation timing.

The partial discharge signal acquisition unit may selectively use the first, second or third analog-to-digital converter according to the analog-to-digital conversion speed.

The first analog-to-digital converter may acquire the partial discharge signal by being immediately sampled at an RF level without undergoing a modulation process separate from the input radio frequency (RF) signal.

The second analog-to-digital converter may acquire the partial discharge signal by sampling the signal amplified or attenuated by the variable amplification unit controlled by the controller at high speed without performing a special modulation process.

The third analog-to-digital converter may acquire the partial discharge signal by sampling a peak hold value calculated through a peak hold method of amplifying or attenuating an input signal and modulating the RF log detection module to store 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 the circuit configuration according to the digital-to-analog conversion speed.

The second digital-to-analog converter is a frequency voltage controlled RF generator, an RF level adjusting unit for adjusting the RF signal generated by the RF generator, an RF amplifier for amplifying the adjusted RF signal and the generation of the RF burst by the amplification By further comprising an output level control unit for generating a partial discharge signal.

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

The apparatus for acquiring the partial discharge timing signal according to an embodiment of the present invention can effectively detect whether the partial discharge signal is included in the input signal.

The apparatus for acquiring partial discharge timing signals according to an embodiment of the present invention can effectively remove noise and partial discharge similar noise and detect partial discharge even when the partial signal and the noise and the partial discharge similar noise are mixed in the input signal. Make sure

The technical concept of the present invention is a PANA (PD Amplification Noise Attenuation) method

(Korean Patent Application No. 10-2017-0134573) is referred to as the PANA-timing method applied.

In the PANA-timing method of the present invention, the partial discharge signal component is amplified by the reference voltage Vref and the noise component is attenuated by the reference voltage Vref with respect to the partial discharge signal and the noise signal mixed in the same time zone. Advances in PANA technology that can discriminate partial discharge signals by using the discrimination points as a reference, convert the partial discharge detection signal into a timing signal, acquire a signal at the timing signal generation, and convert it into a TTL It can be combined with a circuit to detect the timing of occurrence of partial discharge, change it back into a TTL signal, and use a TTL signal to acquire a partial discharge signal using an ADC or the like. By producing and transmitting the signal, there is a characteristic that a partial discharge signal from which noise is removed can be obtained.

The present invention is a cable partial discharge prevention diagnosis, SIS (Solid Insulation Switchgear) facility partial discharge prevention diagnosis, electric vehicle partial discharge prevention diagnosis, electric vehicle charger partial discharge prevention diagnosis, GIS (Gas Insulation Switchgear) partial discharge prevention diagnosis, noise removal function It can be applied to UHF partial discharge sensor, bushing partial discharge prevention diagnosis and partial discharge noise canceling module.

1 is a diagram illustrating a partial discharge noise suppression and signal processing system according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of a partial discharge timing signal acquisition device according to an embodiment of the present invention.
3 is a block diagram illustrating an embodiment of a configuration of a proportional signal generator of FIG. 2.
FIG. 4 is an exemplary circuit diagram of the transfer function generation module of FIG. 3.
FIG. 5 is a block diagram illustrating the configurations of the first automatic gain adjusting unit and the second automatic gain adjusting unit in FIG. 2, respectively.
FIG. 6 is a circuit diagram of other embodiments constituting the partial discharge feedback module in FIG. 5.
FIG. 7 is a circuit diagram illustrating an example of a timing noise removing unit of FIG. 2.
FIG. 8 is a diagram illustrating voltage waveforms that the partial discharge noise suppression and signal processing system of FIG. 1 receives or outputs during timing noise removal, timing signal acquisition, partial discharge signal reproduction, or production during partial discharge detection.
FIG. 9 is a diagram illustrating an experimental result of removing noise and detecting partial discharge by using the partial discharge noise suppression and signal processing system of FIG. 1.
FIG. 10 is an output result graph showing a result of detecting whether partial discharge has occurred by actually implementing the partial discharge noise suppression and signal processing system 1000 shown in FIG.
FIG. 11 is a diagram illustrating a configuration of the partial discharge signal acquisition unit 210 shown in FIG. 1 according to an embodiment.
12 is a diagram illustrating a configuration of the partial discharge signal generator 220 of FIG. 1 according to an exemplary embodiment.

Description of the present invention is only an embodiment for structural or functional description, the scope of the present invention should not be construed as limited by the embodiments described in the text. That is, since the embodiments may be variously modified and may have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, the objects or effects presented in the present invention does not mean that a specific embodiment should include all or only such effects, the scope of the present invention should not be understood as being limited thereby.

On the other hand, the meaning of the terms described in the present application should be understood as follows.

Terms such as "first" and "second" are intended to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be named a second component, and similarly, the second component may also be named a first component.

When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is referred to as being "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as "comprise" or "have" refer to a feature, number, step, operation, component, part, or feature thereof. It is to be understood that the combination is intended to be present and does not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

In each step, an identification code (e.g., a, b, c, etc.) is used for convenience of description, and the identification code does not describe the order of the steps, and each step clearly indicates a specific order in context. Unless stated otherwise, they may occur out of the order noted. That is, each step 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 art unless otherwise defined. Generally, the terms defined in the dictionary used are to be interpreted to coincide with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present application.

1 is a diagram illustrating a partial discharge noise suppression and signal processing system according to an embodiment of the present invention.

Referring to FIG. 1, the partial discharge noise suppression and signal processing system 1000 includes an input terminal 1, an output terminal 2, a first signal distribution module 3, a partial discharge timing signal acquisition device 100, and a controller. 200, the partial discharge signal acquisition unit 210 and the partial discharge signal generation unit 220 may be included.

In one embodiment, the control unit 200 may be implemented by applying a microprocessor, and the partial discharge signal acquisition unit 210 may be implemented by applying an analog to digital converter (ADC). The ADC may acquire the signal magnitude according to the command of the controller 200 and pass it to the controller 200.

In one embodiment, the partial discharge signal generator 220 may apply a digital to analog converter (DAC). When the DAC signal is generated, the size of the signal may be provided by the controller 200 in the same magnitude or amplified or attenuated by the control unit 200. The signal size, burst period, frequency, and waveform when the DAC signal is generated may be determined by the controller 200.

As a result, the partial discharge noise suppression and signal processing system acquires the partial discharge generation timing through the partial discharge timing signal acquisition device 100, and at this time, detects the magnitude of the partial discharge signal with the ADC and equals the detected partial discharge signal magnitude. In addition, the attenuated or amplified magnitude, burst period, frequency, and waveform can be determined by the controller, and only the partial discharge signal can be reproduced or produced by the DAC, thereby effectively suppressing noise and detecting the partial discharge signal. As a result of the experiment, it was found that the timing of generation of the timing signal is generated when the partial discharge signal is generated (immediately after the occurrence of the partial discharge signal cycle), thereby making it possible to obtain very accurate noise processing and partial discharge. The present invention seeks to achieve the effects of the present invention using the timing results.

In one embodiment, the partial discharge noise suppression and signal processing system is capable of reproducing the noise-free partial discharge signal by acquiring only the partial discharge signal by measuring the magnitude of the partial discharge while simultaneously acquiring the timing of occurrence of the partial discharge. It can be used to.

In one embodiment, the partial discharge noise suppression and signal processing system acquires the timing of occurrence of the partial discharge and at the same time measures the magnitude of the partial discharge, reproduces the partial discharge signal, and sends it to the active partial discharge detection sensor module having a noise removing function. It can be used to.

2 is a diagram illustrating a configuration of a partial discharge timing signal acquisition device according to an embodiment of the present invention.

Referring to FIG. 2, the partial discharge timing signal acquisition device 100 may include a proportional signal generator 110, a first automatic gain adjuster 120, a second automatic gain adjuster 130, and a timing noise remover 140. ) And a timing signal generator 150.

The proportional signal generator 110 generates first and second proportional signals according to the input signal. More specifically, the proportional signal generator 110 may be electrically connected to the input port 10 at an input terminal to receive an input signal through the input port 10, and based on the received input signal, the first and second signals may be used. Second proportional signals, and outputting first and second proportional signals electrically connected to input terminals of the first and second automatic gain control units 120 and 130 at an output terminal, respectively. It may be provided to the input terminal of the control unit (120, 130).

In one embodiment, the proportional signal generator 110 may generate first and second proportional signals proportional to the strength of at least one of amplitude, frequency, and power of the input signal, for example, the input signal Vin ′. When received, the proportional signals V1 'and V2' may be generated as DC output voltages proportional to the power appearing at the corresponding input terminals (see the graph of FIG. 8). This will be described in more detail with reference to FIG. 3.

3 is a block diagram illustrating an exemplary embodiment of a configuration of a proportional signal generator of FIG. 2.

Referring to FIG. 3, the proportional signal generator 110 includes a second signal distribution module 112, first and second log detection modules 114, and first and second transfer function generation modules 116. can do.

The second signal distribution module 112 may distribute at least two input signals, and in one embodiment, generate at least two signals having the same phase and amplitude magnitude as the corresponding signal based on the input signal. Can be. The second signal distribution module 112 may be electrically connected to an input terminal of the first and second log detection modules 114 at an output terminal, and the input signal Vin received through the input port 10 may be a first signal distribution module. Based on the output signal Vin ', two signals Vin'1 and Vin'2 having the same phase and amplitude may be generated 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 the input signal to a predetermined specific power gain (for example, 10dB), through the amplifier The amplified signal may be divided into a plurality of signals, and may be implemented as a 1: N (N is a natural number of two or more) dividers.

The first and second log detection modules 114 may generate first and second proportional signals to be proportional 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 ( 112 may be configured as first to third log detection modules when implemented as a 1: 3 distributor. The first log detection module 114a may receive the first signal Vin'1 distributed from the second signal distribution module 112, and the second log detection module 114b may be distributed from the signal distribution module 112. The second signal Vin'2 may be input, and each of the first and second log detection modules 114 is a DC output voltage proportional to the signal power appearing at the corresponding input terminal, and the first and second proportional signals V1 and V2. Each can be generated (see graph in FIG. 8).

In one embodiment, each of the first and second log detection modules 114 may be implemented as a log detector for demodulating a log value of an input signal to generate an output signal. Here, the log detectors collectively represent cases represented by a log detector, a log amplifier, a log amplifier, a logarithmic 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 a signal, noise, and interference.

In another embodiment, each of the first and second log detection modules 114 may be via at least one of an amplifier, an envelope detector, a diode detector, and an integrator or at least one of the integrators. It can 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 output a transfer function signal by converting a proportional signal input to an input terminal based on a reference voltage and a transfer function. The first transfer function generation module 116a receives the first proportional signal V1 from the first log detection module 114a and generates a first transfer function signal V1 'based on the reference voltage Vref and the transfer function to generate a first automatic gain. The second transfer function generation module 116b receives the second proportional signal V2 from the second log detection module 114b based on the same transfer voltage as the same reference voltage Vref. The second transfer function signal V2 ′ may be generated and output to the input terminal of the second automatic gain control unit 130 (see the graph of FIG. 8).

Each of the first and second transfer function generating modules 116 may be provided with a reference voltage Vref having a specific DC voltage level, and may be provided with a transfer function representing a linear characteristic with respect to the input / output signals. At least one of a range, a voltage characteristic of the output signal, and a frequency characteristic of the input signal may be defined. Here, the transfer function can be designed by the designer or the user, and the reference voltage can be adjusted by the user for input values and ranges. This will be described in more detail with reference to FIG. 4.

FIG. 4 is an exemplary circuit diagram of the transfer function generation module of FIG. 3.

Referring to FIG. 4, each of the first and second transfer function generation modules 116 may include first and second resistors 310 and 320 and an amplifier 330.

The first resistor 310 may be disposed between the input terminal and the first input terminal of the amplifier 330, and the second resistor 320 may be disposed between the second input terminal and the output terminal of the amplifier 330. In an example, each may 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 through the first resistor 310 to the first input terminal and receive the reference voltage Vref to the second input terminal. Amplification may be performed based on the feedback through the second resistor 220 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 graph of FIG. 8). Accordingly, the amplifier 330 may output a transfer function signal reduced by a magnitude corresponding to the proportional signal input based on the reference voltage Vref.

Each of the first and second transfer function generation modules 116 may be implemented such that the DC output voltage has a characteristic of a transfer function that is proportional or inversely proportional to the total RF signal power appearing at the corresponding detector input. In one embodiment, each of the first and second transfer function generation modules 116 may be implemented through a differential amplifier that receives an inverted input signal and a non-inverted input signal as input signals, based on Equation 1 below. We can determine the characteristics of the transfer function that define the scope of operation of the transfer function generation module. Here, slope represents a DC output slope characteristic of an output signal versus a power appearing at an input terminal defined by a transfer function. Here, VO1 and VO2 refer to output voltages output from two output stages, and PI1 and PI2 refer to signal powers appearing at both input stages.

[Equation 1]

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

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

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

In the above, the proportional signal generator 110 is configured such that 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. Although described, the present invention is not limited thereto, and may be implemented through at least some of them, and the arrangement order, the number of arrangements, and the connection structure of the components generate a plurality of proportional signals proportional to the amplitude, frequency, or power of the input signal. Various embodiments may be implemented in various circuit forms.

The first automatic gain adjuster 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 control unit 120 may perform auto 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 to feed back to the feedback stage corresponding to the other input stage. In one embodiment, the first automatic gain control unit 120 may perform feedback through at least one partial discharge capacitor and at least one resistor.

In one embodiment, the first automatic gain control unit 120 may perform automatic gain adjustment when the first transfer function signal V1 ′ is input from the proportional signal generator 110, and partially discharge in the process of automatic gain adjustment. The detection signal Vf1 may be processed into an automatic gain control feedback signal Vf1 'generated through the at least one partial discharge capacitor and transmitted to the feedback terminal, so that the partial discharge detection signal Vf1 may be fed back 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 adjuster 120 generates a partial discharge detection signal Vf1 including a high frequency component according to the characteristics of the partial discharge signal and at least one partial discharge. Through the capacitor, the automatic gain control feedback signal Vf1 'can be transformed and fed back to the feedback stage. Accordingly, the gain at the automatic gain overshoot can be modified to induce a signal deformation of the partial discharge detection signal Vf1 according to the high frequency component. (Case of partial discharge in the graph of FIG. 8), if not included, a signal deformation of the partial discharge detection signal Vf1 may not be induced (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 illustrating the configurations of the first automatic gain adjusting unit and the second automatic gain adjusting unit 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 adjuster 120 may include an AGC module 410 and a partial discharge feedback module 420.

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

The partial discharge feedback module 420 is connected to the output terminal and the feedback terminal of the AGC module 410, and may process the output signal of the AGC module 410 to feed back to the feedback terminal. The partial discharge feedback module 420 further includes at least one partial discharge capacitor 420a and at least one partial discharge resistor 420b, each of which is connected at least once with at least one of an output terminal and a feedback terminal of the AGC module 410. can do.

In one embodiment, the partial discharge feedback module 420 has a partial discharge detection signal at the feedback terminal of the AGC module 410 through a parallel configuration of at least one partial discharge capacitor 420a and at least one partial discharge resistor 420b. The automatic gain adjustment feedback signal Vf1 'formed through the processing of Vf1 can be fed back. For example, when the partial discharge signal is reflected in the output partial discharge detection signal, the partial discharge feedback module 420 is charged-discharged between the partial discharge capacitor 420a and the partial discharge resistor 420b each configured of an RC parallel circuit. In addition, the amplification degree g of the AGC module 410 may be changed by a feedback action to induce temporary overamplification and fluctuation.

More specifically, the partial discharge signal is a cluster composed of high frequency components having a pulse width of several ns, while noise may be regarded as a cluster of relatively low frequency components having a wide pulse width. For example, through the log detector circuit, the partial discharge burst has an impulse shape, and the noise has a gentle triangle wave shape. The impulse-shaped waveform is composed of high frequency components in the frequency spectrum, and the gentle triangular wave is composed of relatively low frequency components. For example, the response in the partial discharge feedback module 420 composed of RC parallel circuits is different from each other. . In one embodiment, the RC parallel circuit of the partial discharge feedback module 420 composed of a specific R value and a C value responds to the impulse but does not react to the gentle triangle wave (see the graph of FIG. 8).

When the partial discharge detection signal is output from the output terminal of the AGC module 410, the partial discharge feedback module 420 is connected to the corresponding output terminal and has an appropriate value. For example, the partial discharge feedback module 420 is charged through an RC parallel circuit composed of a capacitor and a resistor. Discharge feedback can be formed to reduce the high frequency component to the partial discharge detection signal, thereby lowering the intensity of the output signal.Ag the automatic gain control feedback signal in which the high frequency component is reduced, not the automatic gain control feedback signal as it is. By feeding back the module 410 to temporarily increase the amplification degree for automatic gain adjustment, the AGC module 410 may temporarily over-amplify according to the feedback to generate a wave.

The partial discharge feedback module 420 may be implemented through configurations of various other embodiments. In one embodiment, the partial discharge feedback module 420 may be implemented as at least one RC parallel circuit comprised of a single capacitor and a single resistor, as described above, and in other embodiments, as shown in FIG. 6. Likewise, at least one partial discharge capacitor 420a, at least one partial discharge resistor 420b, at least one partial discharge inductor 420c, and at least one partial discharge amplifier 420d may be configured through a combination of at least some of them. However, the present invention is not limited thereto and may be implemented through various combinations of configurations in which the signal distortion is fed back to the AGC module 410 by adjusting the output signal to correspond to the characteristics of the partial discharge signal. Can be.

The first automatic gain control unit 120 feeds back the amplitude or frequency of the partial discharge detection signal to the input terminal through the at least one partial discharge capacitor 420a, and if the partial discharge signal is reflected in the corresponding partial discharge detection signal, the automatic gain. Temporary overamplification 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 adjuster 120 reflects the partial discharge signal component to perform the partial discharge in the process of performing automatic gain adjustment on the transfer function signal V1 'inputted. The partial discharge detection signal Vf1 reflecting the signal component can be generated, and the automatic gain adjustment feedback signal Vf1 'processed by the partial discharge feedback module 420 is fed back so that the voltage gain for automatic gain adjustment is temporarily increased. It is possible to temporarily over-amplify, and through this process, the modified partial discharge detection signal Vf1 compared to the transfer function signal V1 'may be output (case of partial discharge in the graph of FIG. 8). For another example, if the partial signal is not included in the input signal Vin, the first automatic gain adjuster 120 adjusts the automatic gain control with respect to the transfer function signal V1 'that is input by reflecting the partial discharge-like noise or the communication noise component. In the process of performing the feedback through the partial discharge feedback module 420, which is not separately processed, the automatic gain adjustment feedback signal Vf1 'can be controlled so that the voltage gain for automatic gain adjustment is automatically adjusted so that there is no temporary over-amplification. Through the process, it is possible to output the partial discharge detection signal Vf1 unmodified or less than the reference range compared to the transfer function signal V1 '(case of partial discharge-like noise or communication noise in the graph of FIG. 8). As a result, the first automatic gain control unit 120 may output the partial discharge detection signal Vf1 having different waveform characteristics depending on whether the partial discharge signal is included.

In one embodiment, the first automatic gain control unit 120 outputs the partial discharge detection signal with a voltage gain corresponding to the voltage gain adjustment factor g calculated by calculating the 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 420 to reflect the voltage gain adjustment. For example, assuming that a partial discharge occurs, as shown in FIG. 8, the first automatic gain control unit 120 uses amplitude and frequency by the partial discharge feedback module 420 from the partial discharge detection signal Vf1 output in real time. The voltage gain can be temporarily increased by receiving a feedback of the auto gain control feedback signal Vf1 'whose strength is modified, and calculating the voltage gain adjustment factor g to a high value. A temporary overamplification may be performed on the one transfer function signal V1 '(or the first proportional signal V1') to immediately reflect the partial discharge detection signal Vf1 to the partial discharge detection signal. From the time point, the partial discharge detection signal Vf1 temporarily amplified can be output. In one embodiment, the automatic gain adjuster 130 may perform automatic gain adjustment so that the average voltage gain is 1 when such transient overamplification does not occur.

In one embodiment, the automatic gain control unit 130 temporarily has a partial discharge signal of 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 an interval where there is no partial discharge signal, the noise signal may have a lower value than Vref. (See Vf1 in the graph of FIG. 8)

[Equation 2]

(Where g means voltage gain adjustment factor, v ₁ 'means transfer function signal, v _f1 means partial discharge detection signal, and v _f1 ' means automatic gain adjustment feedback signal)

The first automatic gain control unit 120 filters a specific frequency band from the partial discharge detection signal through at least one partial discharge capacitor 420a having one end connected to the output terminal and the other end grounded, and feedback the corresponding automatic gain adjustment process. can do. In an exemplary embodiment, the first automatic gain control unit 120 may filter a high frequency signal that is outside a predetermined frequency band in the frequency response characteristic of the partial discharge detection signal through the partial discharge feedback module 420 configured as an RC parallel circuit. In this filtering process, the partial discharge feedback signal modified by the amount of charge charged and discharged from the partial discharge detection signal may be fed back to the automatic gain adjustment process of the AGC module 410. For example, the partial discharge feedback module 420 may function as a low pass filter (LPF) through this RC coupling configuration, for example, an automatic gain in which a signal of 500 MHz frequency band or more is filtered in the partial discharge detection signal Vf1. The adjustment feedback signal Vf1 'may be fed back to the AGC module 410.

At this time, in one embodiment, the partial discharge capacitor 420a may be designed to have a capacitance value of 30 pF to 300 pF, and the partial discharge resistor 420b may be at several kohms depending on the capacitor design range of the partial discharge capacitor 420a. It can be designed to have a value of several hundred kohm, for example, it can be designed to have a resistance value of 20kOhm ~ 40kOhm, and adjust the device value in consideration of the length pattern width of the pattern and the dielectric constant of the material in the PCB pattern design Can and can vary.

As described above, in one embodiment, the feedback module 420 may perform feedback through at least one partial discharge capacitor 420a and at least one partial discharge resistor 420b, and in another embodiment, Feedback may be performed through a low pass filter (LPF) or high pass filter (HPF) implemented by at least two combinations of a capacitor, an inductor, a resistor, and an amplifier. For example, as shown in FIG. 6A, the feedback module 420 may be composed of a partial discharge capacitor 420a, a partial discharge resistor 420b, and a partial discharge inductor 420c. Can function as an LPF. For another example, as shown in FIG. 6B, the partial discharge feedback module 420 may be configured of a capacitor 420a, a partial discharge resistor 420b, and a partial discharge amplifier 420d, and such a coupling configuration. Can function as LPF.

In the above, exemplary configurations for implementing the partial discharge feedback module 420 have been described. However, the present invention is not limited thereto, and the output signal of the AGC module 410 is modified and fed back to detect the partial discharge. Of course, it can be configured in various forms necessary for the function of inducing and wave.

The second automatic gain adjusting 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 adjuster 130 may include an AGC module 410. In one embodiment, the second automatic gain adjusting unit 130 performs automatic gain adjustment on the input received through the AGC module 410 when the second proportional signal or the second transfer function signal is received, and outputs the signal. May be fed back to the feedback stage of the input stage to generate a partial discharge comparison signal.

For example, the second automatic gain control unit 130 performs the automatic gain adjustment on the received second proportional signal (or the second transfer function signal V2 ') regardless of the presence or absence of the partial discharge signal to compare the partial discharge. The signal Vf2 is generated and is not deformed compared to the second proportional signal (or the second transfer function signal V2 ') through a series of processes for feeding back the partial discharge comparison signal Vf2 generated in the process of automatic gain adjustment to the feedback stage. The partial discharge comparison signal Vf2 modified to be less than may be output (see the graph of FIG. 8). As a result, the partial discharge detection signal Vf1 generated by the first automatic gain adjuster 120 and the partial discharge comparison signal Vf2 generated by the second automatic gain adjuster 130 are included in the input signal. It can be output as an analog signal having a different value depending on whether or not.

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 remover 140 and adjust the self and the timing noise remover 140 to adjust the output impedance. It may further include a resistor of several kohms disposed between the input terminal of the).

The timing noise remover 140 generates a noise removing signal from which the partial discharge noise is removed based on the partial discharge detection signal and the partial discharge comparison signal. For example, the timing noise remover 140 may generate a noise canceling signal by filtering two input signals based on a reference voltage, and compare the partial discharge detection signal with the partial discharge based on the reference voltage. Only part of the signal may be buffered, amplified or subtracted to produce a noise cancellation signal.

The timing noise removal unit 140 may remove components other than the partial discharge as noise by eliminating the difference portion between the partial discharge detection signal and the partial discharge comparison signal or summing similar portions. In one embodiment, the timing noise remover 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 erases the similar part, and acquires the remaining part to remove the noise. Vout (denoise) may be generated (see graph of FIG. 8).

In one embodiment, the timing noise remover 140 differentially amplifies a difference amplifier or a partial discharge detection signal and the partial discharge comparison signal that calculates a difference between the partial discharge detection signal and the partial discharge comparison signal. The differential amplifier may be implemented through a differential amplifier. For example, the timing noise removing unit 140 generates a noise removing signal by subtracting the partial discharge comparison signal from the partial discharge detection signal to generate a noise removing signal, and a differential amplifier using + 5Vdc single power supply as an operating power source. Or a differential amplifier that differentially amplifies the difference between them based on a reference voltage or any particular voltage to generate a noise cancellation signal.

In one embodiment, the timing noise remover 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 an inverse process of the proportional signal generation process from the erased signal. To generate a noise canceling signal. For example, the timing noise remover 140 may generate a noise removal signal Vout by modulating a log value of the corresponding signal after canceling the partial discharge comparison signal Vf2 from the partial discharge detection signal Vf1.

In another embodiment, the timing noise removing unit 140 may determine the difference between the partial discharge detection signal and the partial discharge comparison signal as the partial discharge timing noise, and may obtain the same from the input signal through the signal distribution module 112. A timing noise cancellation signal may be generated by canceling a corresponding difference portion from Vf1 and Vf2 distributed to have an amplitude.

The timing noise remover 140 may further include a timing noise remover module (not shown) which removes a signal output with an intensity smaller than a specific reference voltage among the output signals in order to further remove the timing noise. For example, the timing noise remover 140 may include a voltage that is increased as a result of partial discharge through a timing noise remover module including at least one diode, up to a certain voltage, a reference voltage, or a reference voltage. The drop may generate a timing noise cancellation signal in which timing noise components are additionally removed.

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

In one embodiment, the timing noise removing unit 140 may include a local analog voltage according to a variable resistor manually changed by a user locally, a remote analog voltage provided remotely, or a DAC (eg, a remote digital data transmission provided remotely). Manual setup can be performed based on Digital to Analog Converter 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 the variable resistance value is specified by the user locally, the timing noise removing unit 140 sets the variable resistance to the specified variable resistance value. The generated analog voltage may be determined as the specific reference voltage. In another example, the timing noise removing unit 140 may be an external partial discharge processing server (not shown) or a partial discharge processing terminal (not shown) connected remotely through a remote communication module built in the partial discharge timing signal acquisition device 100. A variable resistor value designated by the user can be received.

In another embodiment, the timing noise remover 140 may include a low pass filter (not shown) and a feedback module (not shown). Here, a low pass filter can be arranged at the output to filter the timing noise rejection signal, and the feedback module detects the lowest, average, or highest value of the filtered timing noise rejection signal through ADC conversion and digital calculation, and the corresponding detected value. The specific reference voltage may be automatically set by feeding back until convergence within this specific reference range. For example, when the timing noise canceling signal 140 is generated, the timing noise canceller 140 generates a signal other than a specific frequency region set by the user in association with the low frequency in the timing noise canceling signal through a low pass filter disposed at the output terminal. The filter may be fed back so that a specific reference voltage is automatically set in this process by repeating the ADC conversion and digital calculation process until the average value of the filtered timing noise removing signal is found within a preset reference average value range.

The timing signal generator 150 may recognize a partial discharge generation timing when the timing noise removing signal is equal to or greater than a reference amplitude and generate a separate partial discharge notification signal converted to a TTL (Transistor Transistor Logic) level. In, the partial discharge notification signal can 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 the design values of the internal components can be adjusted to have the corresponding reference amplitude.

In an exemplary embodiment, the timing signal generator 150 may further generate a partial discharge generation timing signal by converting a partial discharge signal obtained from a differential amplifier or a differential amplifier into a TTL (Transistor Transistor Logic) pulse using a Schmitt trigger circuit. Can be.

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

In an embodiment, the timing signal generator 150 may include at least one of a comparator and a Schmitt-trigger to perform the conversion to the 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 signal generator 150 may set a specific voltage level representing data 1 (high) for a specific duration (eg, For example, a level trigger or an edge trigger that triggers whether or not the output of the comparator indicates data 1, and an edge trigger and voltage level adjustment. It may be implemented by including a combination of at least one of a level shifter. Accordingly, the timing signal generator 150 may provide a partial discharge notification signal having a TTL level for digital signal processing to be used as an input for digital processing in a later step.

In one embodiment, the partial discharge timing signal obtaining apparatus 100 may further include a network communication module, and outputs a warning sound when a partial discharge notification signal is generated and the partial discharge processing server or part connected to the network through the network communication module. The notification message regarding the occurrence and the information about the waveform may be transmitted to the discharge processing terminal. In addition, the apparatus 100 for obtaining the partial discharge timing signal measures the intensity of the partial discharge timing signal using the ADC-converted digital signal and monitors the change in the intensity of the partial discharge through analysis according to the time period, thereby remotely monitoring and remotely preventing the facility It can also be used as a diagnostic device.

FIG. 7 is a circuit diagram illustrating an example of a timing noise removing unit of FIG. 2.

Referring to FIG. 7, the timing noise removing unit 140 receives the partial discharge detection signal Vf1 as the first input, receives the partial discharge comparison signal Vf2 as the 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 remover 140 may function as a subtractor that amplifies the difference in the strengths of the inputs of the two input terminals with the voltage gain 1 by using the operational amplifier. In another embodiment, the timing noise remover 140 uses the operational amplifier. It can also function as a differential amplifier that amplifies the difference in strength between the inputs of both inputs by more than one or less than one voltage gains.

In an exemplary embodiment, the timing noise remover 140 may receive the partial discharge detection signal and the partial discharge comparison signal through the plurality of resistors 610, for example, the first automatic gain adjuster 120. A first resistor 610a disposed between an output terminal of the second terminal and the first input terminal of the differential amplifier 620 and transmitting the partial discharge detection signal Vf1, and an output terminal of the second automatic gain control unit 130 and a differential amplifier 620. A second resistor 610b disposed between the second input terminals of the second transfer terminal 610b to transmit the partial discharge comparison signal Vf2, and a third resistor 610c and the differential disposed and fed back between the first input terminal and the output terminal of the differential amplifier 620. A fourth resistor 610d may be disposed between the second input terminal of the amplifier 620 and the ground. In one embodiment, the plurality of resistors 610 may be designed to have the same resistance value with each other within a resistance range of several kohms.

FIG. 8 is a diagram illustrating voltages input or output by the partial discharge noise suppression and signal processing system of FIG. 2 during timing signal generation, partial discharge detection, partial discharge regeneration, or production.

In FIG. 8, the partial discharge timing signal acquisition apparatus 100 may receive the input signal Vin through the input port 10, and the proportional signal generator 110 may be proportional to the intensity of the input signal Vin (eg, The first proportional signal V1 and the second proportional signal V2, which are demodulated by the logarithm of Vin, may be generated. For example, a portion corresponding to the partial discharge signal among the RF burst signals demodulated by a logarithmic value by the proportional signal generator 110 may have a waveform close to a very narrow waveform width (for example, an impulse). Proportional signals V1 and V2 may be output, and noises other than partial discharge may be output as proportional signals V1 and V2 having a relatively gentle waveform.

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

The first automatic gain adjusting unit 120 performs automatic gain adjustment on the input first transfer function signal V1 ', and the partial discharge feedback module configured as an RC parallel circuit to the partial discharge detection signal Vf1 output during the automatic gain adjusting process. By transforming the partial discharge feedback signal Vf1 'to the feedback terminal of the AGC module 410 through 420, feedback for a series of partial discharge detection may be performed to output the partial discharge detection signal Vf1. The first automatic gain control unit 120 feeds back to the AGC module 410 the automatic gain adjustment feedback signal Vf1 'that temporarily drops the voltage in the high frequency band in the partial discharge detection signal through the partial discharge feedback module 420. According to the feedback, the voltage gain is increased through the AGC module 410 to over-amplify the amplitude of the partial discharge detection signal Vf1 output while the corresponding drop continues for the original signal.

In FIG. 8, when the input signal Vin includes the partial discharge signal, the modified partial discharge detection signal Vf1 may be generated compared to the first transfer function signal, and in the case where the partial discharge similar noise or communication noise is included, the virtual signal is not substantially deformed. Partial discharge comparison signal Vf2 may be generated. In the above description, the partial discharge detection signal Vf1 and the automatic gain control feedback signal Vf1 'are shown separately, but may be represented by substantially the same node voltage depending on the embodiment implemented or parasitic elements in layout layout design.

The timing noise remover 140 may remove the partial discharge timing noise based on the difference between the partial discharge detection signal Vf1 and the partial discharge comparison signal Vf2 and output the timing noise removal signal Vout. The timing noise removing unit 140 may remove components other than the partial discharge as timing noise by eliminating the difference portion between the partial discharge detection signal Vf1 and the partial discharge comparison signal Vf2 or by summing similar portions. 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 the partial discharge timing signal. The reverse process of the proportional signal generation process reproduces the original signal or produces a partial discharge signal similar to the original signal, thereby generating Vout, a pure partial discharge signal from which partial discharge noise is removed.

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

The timing signal generator 150 may generate a partial discharge notification signal Vout (timing) having a TTL level when a difference between the partial discharge detection signal and the partial discharge comparison signal is Vt or more. Vt is a reference voltage applied to the comparator (not shown). If the difference between the partial discharge detection signal and the partial discharge comparison signal is Vt or more, 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 so, the zero potential is output.

According to the above embodiments, the partial discharge timing signal acquisition apparatus 100 may selectively perform feedback based on whether the partial discharge signal is included in the input signal to generate a differential timing noise removal signal, and perform partial discharge. If it is determined that the signal is included may generate a partial discharge notification signal to inform it.

FIG. 9 is a diagram illustrating an experimental result of removing noise and detecting partial discharge by using the partial discharge noise suppression and signal processing system of FIG. 1.

Referring to FIG. 9, the partial discharge detection system 900 may include an electrical device 910, a partial discharge sensor 920, a partial discharge noise suppression and signal processing system 1000, and an output device 930.

The electrical equipment 910 may correspond to a power equipment that performs at least one of electric power, power generation, electric conversion, electric 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 electrical equipment 910 is illustrated in the form of a gas insulated switchgear, 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, and high-speed train or building distribution, UHF. (Ultra High Frequency) It may correspond to an associated device.

The partial discharge sensor 920 may be combined with a ground line of the electrical equipment 910, and may be implemented as a CT (Current Transformer) for detecting and converting electromagnetic waves generated from the electrical equipment 910 into a current. The noise suppression and signal processing system 1000 receives the current converted from the partial discharge sensor 920 as an input signal, generates a partial discharge timing signal based on the input signal, detects only the partial discharge signal, and as a result, detects the partial discharge. Can be performed.

The output device 930 may be connected to the partial discharge timing signal acquisition device 100, and may process signals received from the partial discharge noise suppression and signal processing system 1000 to process phase resolved partial discharge (PRPD) or phase resolved (PRPS). 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 timing signal acquisition device 100 into a digital signal, which 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 for processing a signal received from the FPGA, and a display module for visually outputting the processed signal.

FIG. 10 is an output result graph showing a result of detecting the occurrence of partial discharge by actually implementing the partial discharge noise suppression and signal processing system 1000 shown in FIG.

In FIG. 9, the partial discharge noise suppression and signal processing system 1000 may be implemented as real equipment and receive 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 signal may be processed to detect whether the partial discharge signal is included, and the input / output signal may be visualized through the output device 930.

In FIG. 10, 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 the comparison graph shown through the apparatus of this invention. The apparatus 100 for acquiring the partial discharge timing signal according to an exemplary embodiment of the present invention may confirm that the input signal Vin suppresses noise and detects whether the partial discharge signal is included with high accuracy.

FIG. 11 is a diagram illustrating a partial discharge signal acquisition unit in FIG. 1.

Referring to FIG. 11, the partial discharge signal acquisition unit 210 includes a variable amplifier 211, an RF log detection module 212, a peak hold 214, a peak hold control 213, an ADC control 215, and an ADC. 216, high speed ADC 217 and RF ADC 218.

In one embodiment, the partial discharge signal acquisition unit 210 may use the first, second and third analog-to-digital converter, respectively, depending on the speed of the ADC conversion. Here, the first, second and third analog-to-digital converters may correspond to an RF ADC, a high speed ADC, and a general ADC, respectively.

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

In one embodiment, in the case of RF ADC operation, the input RF signal is directly sampled at the RF level without undergoing a modulation process and supplied to the control unit, and the control unit removes a timing noise removing signal (ie, an RF value at the partial discharge timing). The partial discharge signal value corresponding to can be obtained. In this case, the RF FPGA can be operated.

In one embodiment, in the case of the high-speed ADC operation, it receives a signal amplified or attenuated from the variable amplification unit controlled by the control unit without going through a special modulation process can be sampled at high speed and passed to the control unit, the control unit in the partial discharge timing The discharge signal value can be obtained.

In an exemplary embodiment, in the case of general ADC operation, a peak hold method of amplifying or attenuating an input signal under control of a controller, modulating the RF signal by a RF log detection module, and storing a maximum value in a capacitor may be used. By sampling and transmitting to the control unit to obtain the partial discharge value, the control unit may reset the peak hold capacitor to prepare the next value. In this case, the peak hold period, the peak hold time and the reset timing may be determined by the controller.

FIG. 12 is a diagram illustrating a partial discharge signal generator of FIG. 1.

Referring to FIG. 12, the partial discharge signal generator 220 includes a voltage controller 222, a frequency voltage controlled RF generator 223, an RF level controller 224, a voltage controlled variable RF amplifier 225, and an output level control. The unit 226 may include a DAC 221 and an RF DAC 227.

In one embodiment, the partial discharge signal generator 220 may selectively operate the connection scheme (hereinafter, topology) of the circuit configuration according to the speed of the DAC. More specifically, the partial discharge signal generator 220 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, and the second digital-to-analog converter may correspond to a general DAC. RF DACs can directly generate 500MHz or more RF signals without the need for additional topologies, in which case they can operate RF FPGAs and include the functionality of a Direct Digital Synthesizer (DDS) or Sortware Define Radio (SDR). High speed RF DACs can be operated in a simplified topology. Generic DACs can operate at several Msps.

In one embodiment, for general DAC operation, a frequency voltage controlled RF generator 223, such as a voltage control oscillator (VCO), may be operated and the control voltage of the device is controlled by a voltage supplied from a controller or supplied alone. Can be. The generated RF signal is supplied to the voltage control variable RF amplifier 225 at an appropriate level through the RF level adjusting unit 224 such as an attenuator, and the amplification degree of the device is controlled by the voltage waveform supplied from the DAC 221. To generate an RF burst. The generated RF burst may be appropriately adjusted by the output level adjusting unit 226 such as an attenuator and transmitted as a Vout signal.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1000: Partial Discharge Noise Suppression and Signal Processing System
1: input terminal
2: output terminal
3: first signal distribution module
200: control unit
210: partial discharge signal acquisition unit
211: variable amplifier 212: RF log detection module
213: peak hold control 214: peak hold
215: ADC control 216: ADC
217: high speed ADC 218: RF ADC
220: partial discharge signal generator
221: DAC 222: voltage control unit
223: frequency voltage controlled RF generator
224: RF level control device 225: Voltage controlled variable RF amplifier
226: output level regulator 227: RF DAC
228 high speed DAC
100: partial discharge timing signal acquisition device
110: proportional signal generator
112: second signal distribution module 114: first and second log detection modules
116: First and second transfer function generation modules
120: first automatic gain adjustment unit 130: second automatic gain adjustment unit
140: timing noise removal unit
410: AGC module 420: partial discharge feedback module
900: partial discharge detection system
910: electrical equipment 920: partial discharge sensor
930: output device

Claims (20)

A proportional signal generator configured to generate first and second proportional signals according to the input signal;
A first automatic gain adjuster configured to perform 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;
A second automatic gain adjuster configured to perform automatic gain adjustment based on the partial discharge comparison signal generated based on the second proportional signal and fed back to an input terminal;
A timing noise removing unit generating a timing noise removing signal from which timing noise has been removed based on the partial discharge detection signal and the partial discharge comparison signal; And
A partial discharge timing signal acquisition device comprising a timing signal generation unit for acquiring partial discharge generation timing.
The method of claim 1, wherein the first automatic gain control 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 to the input terminal through the at least one partial discharge capacitor, a temporary overamplification is performed during the automatic gain adjustment. Partial discharge timing signal acquisition device, characterized in that.
The method of claim 1, wherein the first automatic gain control unit
And at least one partial discharge capacitor having one end connected to the output terminal and the other end grounded to filter a specific frequency band from the partial discharge detection signal to feed back a corresponding automatic gain adjustment process.
The method of claim 1, wherein the first automatic gain control unit
Partial discharge timing comprising at least one partial discharge resistor connected to one end of the at least one partial discharge capacitor, and performing the feedback through the at least one partial discharge capacitor and the at least one partial discharge resistor. Signal acquisition device.
The method of claim 1, wherein the first automatic gain control unit
Partial discharge timing signal acquisition device characterized in that for performing the feedback through a low pass filter (LPF) or a high pass filter (HPF) implemented by at least two combinations of a capacitor, an inductor, a resistor and an amplifier.
The method of claim 1, wherein the timing noise removing unit
And a component other than the partial discharge is removed as the timing noise by canceling the difference portion between the partial discharge detection signal and the partial discharge comparison signal or summing similar portions.
The method of claim 6, wherein the timing noise removing unit
A differential amplifier for calculating a difference between the partial discharge detection signal and the partial discharge comparison signal or a differential amplifier for differentially amplifying the partial discharge detection signal and the partial discharge comparison signal. Partial discharge timing signal acquisition device, characterized in that.
The method of claim 7, wherein the timing signal generator
And partially generating a partial discharge generation timing signal by converting the partial discharge signal obtained from the difference amplifier or the differential amplifier into a TTL (Transistor Transistor Logic) pulse.
The method of claim 1, wherein the proportional signal generator
Implemented through at least one of a log detector, an amplifier, an envelope detector, and an integrator for demodulating the log value of the input signal, or at least two combinations thereof. A partial discharge timing signal acquisition device.
The method of claim 1, wherein the timing noise removing unit
Partial discharge timing signal acquisition device further comprises a noise removal module for removing a signal output at an intensity less than a specific reference voltage of the output signal to further remove the timing noise.
The method of claim 10, wherein the timing noise removing unit
Partial discharge timing signal acquisition device, characterized in that for determining the specific reference voltage through manual setting by the user or automatic setting through internal feedback.
The method of claim 11, wherein the timing noise removing unit
The manual setting is based on a local analog voltage according to a variable resistor manually variable by a user locally, a remote analog voltage provided remotely, or a digital to analog converter (DAC) output by remotely provided remote digital data transmission. Partial discharge timing signal acquisition device, characterized in that performed.
The method of claim 11, wherein the timing noise removing unit
(a) a low pass filter disposed at the output stage to filter the timing noise canceling signal; and (b) the lowest, average, or highest value of the filtered timing noise rejection signal is detected through ADC conversion and digital calculation. And a feedback module for automatically setting the specific reference voltage by feeding back until it converges within a specific reference range.
A partial discharge timing signal acquisition device for acquiring a partial discharge generation timing immediately at the beginning of the signal period when the partial discharge signal is generated;
A partial discharge signal acquisition unit for acquiring the magnitude of the partial discharge signal immediately after acquiring the partial discharge generation timing;
A control unit controlling an operation between the partial discharge timing signal acquisition device and the partial discharge signal acquisition unit; And
And a partial discharge signal generator which measures the magnitude of the partial discharge signal and reproduces or produces the partial discharge signal from which noise is removed to be equal to the input partial discharge signal.
The partial discharge timing signal acquisition device
Proportional signal generator for generating first and second proportional signals according to the input signal, automatic gain control for 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 A first automatic gain adjuster for performing automatic gain adjustment based on the partial discharge comparison signal generated based on the second proportional signal and fed back to an input terminal, and the partial discharge detection signal; And a timing signal generator for generating a timing noise removal signal from which timing noise has been removed based on the partial discharge comparison signal, and a timing signal generator for acquiring a timing for generating a partial discharge.
15. The method of claim 14, wherein the partial discharge signal acquisition unit
Partial discharge noise suppression and signal processing system, characterized in that selectively using the first, second or third analog-to-digital converter according to the analog-to-digital conversion speed.
The method of claim 15, wherein the first analog-to-digital converter
Partial discharge noise suppression and signal processing system characterized in that to obtain the partial discharge signal is sampled directly at the RF level without undergoing a modulation process to the input RF (Radio Frequency) signal.
The method of claim 15, wherein the second analog-to-digital converter
Partial discharge noise suppression and signal processing system characterized in that to obtain the partial discharge signal by sampling at a high speed by receiving a signal amplified or attenuated by the variable amplification unit controlled by the control unit.
The method of claim 15, wherein the third analog-to-digital converter
Partial discharge noise suppression, characterized in that the amplification or attenuation of the input signal and modulated by the RF log detection module to obtain the partial discharge signal by sampling the peak hold value calculated through the peak hold method of storing the maximum value in the capacitor; Signal processing system.
The method of claim 14, wherein the partial discharge signal generation unit
A partial discharge noise suppression and signal processing system selectively using first and second digital-to-analog converters that variably determine the topology of the circuit configuration in accordance with the digital-to-analog conversion rate.
20. The apparatus of claim 19, wherein the second digital to analog converter is
Frequency voltage controlled RF generator;
An RF level controller for adjusting an RF signal generated by the RF generator;
An RF amplifier for amplifying the regulated RF signal; And
Partial discharge noise suppression and signal processing system further comprises an output level control unit for generating a partial discharge signal by adjusting the generation of the RF burst by the amplification.

Images