KR101077441B1 - Insulation deterioration monitoring system using vibration detection and metal enclosed switchgears using the same - Google Patents

Insulation deterioration monitoring system using vibration detection and metal enclosed switchgears using the same Download PDF

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KR101077441B1
KR101077441B1 KR20110046935A KR20110046935A KR101077441B1 KR 101077441 B1 KR101077441 B1 KR 101077441B1 KR 20110046935 A KR20110046935 A KR 20110046935A KR 20110046935 A KR20110046935 A KR 20110046935A KR 101077441 B1 KR101077441 B1 KR 101077441B1
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high frequency
ultra
frequency vibration
sensor
insulator
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KR20110046935A
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Korean (ko)
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홍춘근
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(주)서전기전
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Abstract

The present invention relates to a switchboard, and more particularly, is installed on the insulators of a plurality of installation devices installed inside the switchboard, and generated by partial discharge when the insulator deteriorates and detects ultra-high frequency vibrations transmitted through the insulator. A sensor; Is installed on the front of the switchboard and electrically connected to the plurality of ultra-high frequency vibration sensor, and receives and stores the ultra-high frequency vibration signal measured by the ultra-high frequency vibration sensor through a sensor input terminal, according to the pattern or intensity of the ultra-high frequency vibration signal Real-time deterioration using the ultra-high frequency sensor comprising a; display the deterioration state of the installation device to the outside, and converts the result into a protocol capable of wired and wireless communication to transmit to the ultra-high frequency vibration monitoring device installed in the central monitoring panel; It relates to a sensing device.

Description

Real-time deterioration detection device using ultra-high frequency vibration sensor and switchboard using the same {INSULATION DETERIORATION MONITORING SYSTEM USING VIBRATION DETECTION AND METAL ENCLOSED SWITCHGEARS USING THE SAME}

The present invention relates to a switchboard, and more particularly, to install the ultra-high frequency vibration sensor to the insulator of the internal installation device to detect in real time the ultra-high frequency vibration signal generated inside the switchboard during operation, which is transmitted through the insulator when the insulator deteriorates. The present invention relates to a real-time deterioration detection device using an ultra-high frequency vibration sensor and a switchboard using the same, which measure vibration signals caused by partial discharge, analyze the measured microwave signals and analyze the degree and extent of insulation deterioration.

The switchboard is installed at the power consumer side of apartments, buildings, factories, substations, steel mills, etc., and is used to convert special high voltage power to low pressure and supply it to the facility. These switchboards are epoxy mold type current transformers, transformers, power meters, bushings, insulators, Various internal installation equipment such as load breaker and vacuum breaker is provided.

In order to prevent discharge such as corona, partial discharge and flashover occurring in high voltage situations, various kinds of insulators are used in these internal installation devices. However, such insulators may cause gaps, such as voids or peeling, during cooling or heating during operation or for any reason during the manufacturing process. However, this gap generates a partial electric discharge each time a high electric field is applied, and if this partial discharge is repeated, the insulation gradually erodes and the dielectric strength is reduced, resulting in a serious breakdown event.

In order to solve this problem, it is desirable to reduce the occurrence of partial discharge by removing the gap in the insulator in advance, but it is difficult to completely remove the gap in consideration of various causes. In addition, the insulation properties of the insulation should be sufficiently inspected from the time of manufacture. Such inspection is effective for inspection of initial manufacturing defects, but practical inspection is difficult because insulation degradation over time occurs during operation of the switchboard. Therefore, conventionally, the time interval between inspections increases, and it is impossible to always accurately determine the insulation characteristics, which causes an unexpected unexpected accident.

In view of this, various methods for monitoring degradation by measuring partial discharges have been conventionally proposed. For example, the conventional partial discharge measurement method, a method for installing a partial discharge contact sensor inside the switchboard in order to detect a partial discharge appears when the insulation deterioration occurs, a method of attaching a UHF sensor or an ultrasonic sensor to the switchboard enclosure, Various methods have been disclosed such as attaching and installing a capacitive sensor specially manufactured to an enclosure, and attaching and installing an inductive sensor to a circuit breaker ground wire.

However, the conventional method was only able to detect whether or not partial discharge occurred in the switchboard, and it was difficult to individually determine the degree of insulation deterioration of each installation apparatus. Therefore, it was difficult to predict dielectric breakdown in advance. In addition, the conventional partial discharge measuring method is detected by an expensive gun type test device such as a partial discharge pulse or an ultrasonic sensor or an antenna generated in a power facility, and then transferred to a computer in the form of data for analysis. Since the situation is performed only at regular examination time by a test for determining the discharge state or by manual labor of the test manager, there is a limit in which the dielectric breakdown of the installation equipment cannot be predicted in real time.

In addition, a thermal imaging system has also been disclosed in which a thermal imaging spectrum obtained by capturing a local live state such as any part of a power plant by using a thermal imaging camera is diagnosed without a power failure. . However, the conventional thermal imaging system handles a large amount of thermal image data photographing live situations by a plurality of insulated devices, so that a large computing system is required to process live situations in real time, or a plurality of expensive thermal imaging cameras are used. It is not economical because it must be equipped with a dog, and it is insufficient to monitor and predict insulation degradation in real time.

Another conventional technique has been a method of detecting electromagnetic waves corresponding to partial discharge by using an omnidirectional antenna, but merely attempting to diagnose partial discharge occurring inside a switchboard, and deteriorating individual installation equipment. There was a limit to the oversight, and no specific means were provided for precise monitoring to predict the breakdown of insulation.

In addition, the conventional vibration measuring method has been disclosed a method of attaching a vibration sensor to the iron core of the transformer in order to determine the abnormality of the transformer using the shaking phenomenon when the transformer is operating. In other words, this method distinguishes the vibration signal when the transformer is operating normally from the vibration signal when the transformer is abnormal, and determines the abnormality of the transformer. There was a problem of greatly falling, and in order to specifically find the site of deterioration, the procedure has been complicated because the deterioration site should be estimated using three or more vibration sensors.

In addition, since the high-voltage current flows in the switchboard, and the space is small, it is difficult to determine the installation position of the dozens of sensors, and there are many difficulties in the process of connecting wires of the respective sensors.

Accordingly, the present invention is to solve the problems of the prior art, the main object of the present invention, by installing an ultrasonic vibration sensor for detecting the vibration of the ultra-high frequency generated when the insulation deterioration in each of the insulation of the installation device installed inside the switchboard By directly measuring the ultrasonic vibration transmitted through the insulator, it minimizes the influence of external noise and monitors the insulation deterioration on each insulation in real time so that it can accurately predict the breakdown of the insulation and pinpoint the location of the insulation that caused the deterioration. It is to provide a real-time degradation detection device using an ultra-high frequency vibration sensor that is easy to repair and replace the insulation.

Another object of the present invention is to analyze the waveform of the ultra-high frequency vibration measured using the ultra-high frequency vibration sensor to analyze the degree, state or current situation of insulation degradation in real time and to notify the manager in real time when an emergency occurs due to insulation degradation It is to provide a real-time degradation detection device using a vibration sensor that can prevent the breakdown in advance.

In addition, another object of the present invention is to install an ultra-high frequency vibration sensor for transmitting the ultra-high frequency vibration signal wirelessly to an insulator of various installation equipment installed inside the switchboard, and ultrasonic vibration signal for wirelessly receiving the ultrasonic vibration signal on the front of the switchboard. It is to provide a real-time deterioration detection device using a vibration sensor, characterized in that by installing a receiver to simplify or remove the connection wire for connecting the microwave sensors.

As a means for achieving the above object of the present invention, the real-time deterioration detection device using a vibration sensor according to the present invention, in the deterioration detection device for monitoring the insulation deterioration of the insulation provided in the switchboard,

An ultra-high frequency vibration sensor embedded in an insulator of a plurality of installation devices installed inside the switchboard and directly detecting the ultra-high frequency vibration generated by partial discharge when the insulator deteriorates and transmitted through the insulator;

Is installed on the front of the switchboard and electrically connected to the plurality of ultra-high frequency vibration sensor, and receives and stores the ultra-high frequency vibration signal measured by the ultra-high frequency vibration sensor through a sensor input terminal, according to the pattern or intensity of the ultra-high frequency vibration signal It is characterized by comprising; a high frequency vibration signal receiver for displaying the deterioration state of the installation device to the outside, and converts the result into a protocol capable of wired and wireless communication to transmit to the ultra-high frequency vibration monitoring device installed in the central monitoring panel.

In the present invention, the ultra-high frequency vibration monitoring device receives and stores data on the deterioration state of the internal insulation of the switchboard from the plurality of ultra-high frequency vibration signal receivers, and analyzes the input data to predict insulation breakdown or remotely when an abnormality occurs. It is characterized in that the administrator of the wired and wireless warning.

In addition, the ultra-high frequency vibration signal receiver, the memory for storing the ultra-high frequency vibration signal received through the sensor input terminal, and the degradation state of the installation device by analyzing the waveform of the ultra-high frequency vibration signal stored in the memory and compared with the reference partial discharge model It is configured to include a control unit for analyzing and transmitting the result to the outside through the communication unit.

In addition, the ultra-high frequency vibration signal receiver, the amplifier and filter for receiving and amplifying and filtering the ultra-high frequency vibration signal received through the sensor input terminal, and converts the ultra-high frequency vibration signal amplified and filtered through the amplifier and filter into a digital signal A to D converter (analog-to-digital converter) for outputting further comprises.

In the present invention, the ultra-high frequency vibration sensor is any one selected from a piezoresistive pressure sensor, a capacitive pressure sensor, an acceleration sensor using a proof mass or a laser vibration measuring device.

The ultra-high frequency vibration receiver includes: an RF transmitter for modulating and transmitting an RF signal, an RF receiver for receiving and demodulating an RF signal, a frequency synthesizer for oscillating a high frequency of a predetermined frequency band, and a microprocessor for processing a received or transmitted signal And a reader including an antenna for transmitting and receiving an RF signal of a predetermined frequency band.

The ultra-high frequency vibration sensor is characterized in that the tag further comprises a RF circuit for transmitting and receiving high-frequency signals, control logic, memory, antenna, coil and rectifier.

In the present invention, the ultra-high frequency vibration sensor is installed in close contact with the installation groove formed in the insulator of the installation device, the outer side is sealed by using an insulating material of rubber material to the vibration signal from the outside to the ultra-high frequency vibration sensor It is characterized in that not to be delivered.

As described above, the ultra-high frequency vibration sensor according to the present invention detects the high frequency vibration signal transmitted through the corresponding insulator directly and blocks the noise transmitted from the outside so as to accurately detect the position of the insulator where the insulation deterioration occurs in real time. Characterized in that it can.

According to the real-time deterioration detection device using the ultra-high frequency vibration sensor of the present invention and the switchgear using the same, by installing the ultra-high frequency vibration sensor for detecting the vibration signal of the ultra-high frequency generated when the insulation deterioration is installed in the insulation of the various installation equipment installed inside the switchboard By directly measuring the microwave vibration transmitted through the insulator, it minimizes the influence of external noise and monitors the insulation deterioration on each insulation in real time, so that it is possible to accurately predict the breakdown of the insulation and to detect the position of the insulation where the insulation deterioration occurred in real time. It can be easy to repair and replace the insulation.

In addition, according to the present invention by measuring the ultra-high frequency vibration generated during the partial discharge by using the ultra-high frequency vibration sensor and by analyzing the waveform of the measured high-frequency or ultra-high frequency vibration in real time to analyze the degree, state or situation of insulation degradation and emergency situation When it occurs, the manager can be notified in real time to prevent insulation breakdown due to insulation deterioration.

In addition, according to the present invention, the ultra-high frequency vibration signal receiver for wirelessly transmitting the ultra-high frequency vibration signal to each of the insulators of the various installation equipment installed inside the switchboard and the front of the switchboard for receiving the ultra-high frequency vibration signal wirelessly By installing the effect of making the structure of the connecting wire of the switchboard very simple.

1 is a schematic configuration diagram of a real-time degradation detection device using an ultra-high frequency vibration sensor according to the present invention,
2 is a block diagram showing a switchboard to which a real-time deterioration detection apparatus using an ultra-high frequency vibration sensor according to the present invention is applied,
Figure 3 is a cross-sectional view showing an example of the ultra-high frequency vibration sensor installed in the insulator of the switchboard internal installation apparatus according to the present invention,
4 is a schematic view showing a schematic structure of an ultra-high frequency vibration receiver according to the present invention;
5 to 8 is a graph showing various waveforms of the ultra-high frequency vibration signal,
9 is a perspective view showing the appearance of an example of an ultra-high frequency vibration receiver according to the present invention;
10 is an exploded perspective view showing an example of the ultra-high frequency vibration device according to the present invention;
11 is a block diagram showing an example of a real-time degradation detection device using a radio frequency identification (RFID) system according to the present invention,
12 is a schematic configuration diagram showing another embodiment of a real-time degradation detection apparatus using an ultra-high frequency vibration sensor according to the present invention;
FIG. 13 is a schematic diagram illustrating an ultrahigh frequency vibration sensor and an ultrahigh frequency vibration receiver to which a radio frequency system is applied so as to be used in a real time degradation detection apparatus using the ultra high frequency vibration sensor of FIG. 12;
14 to 16 are schematic side views showing various methods of installing an ultra-high frequency vibration sensor according to the present invention in an insulator.

Hereinafter will be described in detail a preferred embodiment of a real-time degradation detection device using an ultra-high frequency vibration sensor according to the present invention.

First, referring to Figures 1 and 2, the real-time deterioration detection device (hereinafter referred to as 'degradation detection device') 1 using the ultra-high frequency vibration sensor of the present invention, a plurality of ultra-high frequency vibration sensor (2), It consists of an ultra-high frequency vibration signal receiver 3 connected to the ultra-high frequency vibration sensor 2 and an ultra-high frequency vibration monitoring apparatus 5 connected to the ultra-high frequency vibration signal receiver 3.

As shown, the ultra-high frequency vibration sensor 2 is installed on the insulators 11 of the plurality of internal installation devices installed in the switchboard 100, respectively. And the ultra-high frequency vibration signal receiver (3) is provided one on each front panel 101 of each switchboard (100). The ultra-high frequency vibration signal receiver 3 is electrically connected to a plurality of ultra-high frequency vibration sensors 2 installed in the corresponding switchboard 100.

In addition, the ultra-high frequency vibration receiver 3 is connected to the ultra-high frequency vibration monitoring device 5 installed in the central monitoring panel by wire or wireless. In addition, the ultra-high frequency vibration sensor 2 and the ultra-high frequency vibration signal receiver 3 may also be wirelessly connected through a wireless communication module.

The ultra-high frequency vibration signal receiver 3 is supplied with power through an electric line 32. The ultra-high frequency vibration sensor 2 may receive power from the ultra-high frequency vibration signal receiver 3.

More specifically, referring to FIG. 3, the ultra-high frequency vibration sensor 2 is embedded in an insulator 11 of various internal installation devices 10 such as a bushing, a support insulator, and a high voltage circuit breaker installed inside the switchboard 100. For example, the ultra-high frequency vibration sensor 2 may be inserted into the installation groove 12 formed at the lower end of the insulator 11 and installed. At this time, the ultra-high frequency vibration sensor (2) is in close contact with the insulator (11), the outer side to seal the inlet of the installation groove 12 by using an insulating material 14 of the rubber material.

Therefore, the ultra-high frequency vibration sensor 2 is in close contact with the insulator 11 of the installation device 10 and directly detects the ultra-high frequency vibration due to partial discharge generated when deterioration occurs in the insulator 11 of the installation device 10. You can do it. That is, when a partial discharge occurs in the insulator 11, a high frequency vibration (or a very high frequency signal) that is inaudible to humans is generated, and the high frequency vibration is radiated into the air or transmitted through the insulator 11. Ultra-high frequency vibration transmitted through the air is not only faster than the ultra-high frequency signal or ultrasonic wave propagating to the medium, but also has low attenuation and minimizes external noise.

That is, the ultra-high frequency vibration sensor 2 according to the present invention is characterized in that the inlet of the installation groove 12 is sealed with an insulating material 14 of rubber material so as not to receive the ultrasonic vibration transmitted through the air. As described above, the ultra-high frequency vibration sensor 2 of the present invention blocks the external noise at the same time and at the same time installs the ultra-high frequency vibration sensor 2 in each of the insulators 11 to check the installation device 10 in which the insulation deterioration occurred in real time. Can be.

The present invention senses the ultra-high frequency vibration signal transmitted through the insulator 11 in real time by using this characteristic. That is, conventionally, a method of detecting degradation by receiving an ultrasonic signal mainly emitted into the air is used. However, since the ultrasonic signal radiated into the air is not only mixed with several signals but also external noise is easily mixed, a complicated process for separating the mixed signal is required. Therefore, conventionally, the installation apparatus 10 which generate | occur | produces insulation deterioration in real time was not found. However, since the present invention installs the microwave vibration sensor 2 on the insulator 11 of each installation device 10 and directly measures the microwave vibration signal transmitted through the insulator 11, the insulation deterioration of each insulator is prevented. There is an advantage to monitor in real time.

That is, the ultra-high frequency vibration sensor 2 detects the ultra-high frequency vibration transmitted through the insulator 11 of each internal installation device 10 and outputs an ultra high frequency vibration signal corresponding to the ultra high frequency vibration. The ultra-high frequency vibration sensor 2 includes two methods, a piezoelectric type and an EMAT type (EMAT: Electro-Magnetic Acoustic Transducer). The piezoelectric sensor has a higher sensitivity than the piezoelectric sensor, and serves to change the mechanical vibration energy transmitted through the insulator 11 into an electrical signal. In this case, since the piezoelectric sensor is a contact sensor, a contact medium is applied to improve the sound transmission efficiency on the surface.

Subsequently, the ultra-high frequency vibration signal receiver 3 electrically connected to the ultra-high frequency vibration sensor 2 receives the ultra-high frequency vibration signal measured by the ultra-high frequency vibration sensor 2. Therefore, the configuration of the microwave signal receiver 3 may vary depending on the signal transmitted from the microwave sensor 2. For example, when the ultra-high frequency vibration sensor 2 is provided with a vibration element, an amplifier and a filter, the amplified and filtered analog signal is received. When the / D converter and the data communication module are provided, the digital signal is received.

The ultra-high frequency vibration signal receiver 3 shown in FIG. 4 shows a structure in the case of receiving an analog electric signal. As shown, the ultrasonic plate vibration signal receiver 3 includes a sensor input terminal 32 electrically connected to a plurality of ultra-high frequency vibration sensors 2 and the ultra-high frequency vibration signal measured through the sensor input terminal 32. An amplifier and filter 33 for receiving and amplifying and filtering the input, an A / D converter 35 for converting and outputting an ultra-high frequency vibration signal amplified and filtered through the amplifier and filter 33 into a digital signal, and the A A control unit 37 for storing the signal output from the / D converter 35 or analyzing the waveform of the received microwave signal and comparing the waveform with a reference partial discharge model and displaying or transmitting the analyzed result to the outside, and receiving the received signal. A memory 36 for storing the generated microwave signal or the color matched result, a display unit 38 for displaying the deterioration state of the internal installation device to the outside, and converting the analysis result into a protocol capable of communicating Communication unit 39 for providing a wired and wireless communication port for performing wired and wireless data communication with the ultra-high frequency vibration monitoring device 5 and the remote location, and a warning unit 41 for sending a warning signal to the administrator in accordance with the analysis result )

At this time, the sensor input terminal 32 of the ultra-high frequency vibration signal receiver 3 is provided with connection jacks corresponding to the number of ultra-high frequency vibration sensors 2 installed in the switchboard 100. In addition, a unique number is assigned to each connection jack of the sensor input terminal 32 so that a unique number is assigned to each of the ultra-high frequency vibration signals received through the corresponding connection jack. Alternatively, the amplifier and filter 33 and the A / D converter 35 are provided in a number corresponding to the ultra-high frequency vibration sensor 2, and each A / D converter 35 is assigned a unique number. A unique number may be assigned to the digital signal output from the A / D converter 35. At this time, the unique number indicates the type of the internal installation device and the installation position of the ultra-high frequency vibration sensor. Therefore, a unique number is assigned to each of the ultra-high frequency vibration signals output from the sensor input terminal 32 or the A / D conversion unit 35, and then all of the ultra-high frequency vibration signals are stored or processed together with the unique number.

The amplifier and filter 33 includes a high frequency filter (HPF) having a cutoff frequency of 30 kHz and a cutoff frequency of 500 kHz to remove power noise of 120 Hz, which is a low frequency noise signal of a switchboard, and other noise signals other than a commercial frequency of 60 Hz. LPF (Low-Pass Filter) having a, and LNA (Low Noise AMP) for amplifying the filtered signal.

The control unit 37 is a microprocessor, and stores the ultra-high frequency vibration signal output from the A / D converter 35 in the memory 36. In addition, the controller 37 analyzes the waveform of the ultra-high frequency vibration signal stored in the memory 36 and compares it with the reference partial discharge model to determine the deterioration state. To this end, the control unit 37 is provided with an analysis program to determine whether the degradation of the insulator 11 and the degree of degradation according to the type of the received microwave signal. The analysis program analyzes the received ultra-high frequency vibration signal by FFT (Fast Fourier Transform) and analyzes according to the time series to analyze whether the insulation deteriorates and the degree of degradation.

For example, FIG. 5 shows a normal waveform without deterioration, FIG. 6 shows a waveform when arc discharge is occurring, and FIG. 7 shows a waveform during corona discharge. 8 shows a waveform when tracking occurs. First, referring to FIG. 5 of the normal waveform, a certain type of waveform is detected with time and there is little change in amplitude. Referring to FIG. 6, when the arc is generated, the amplitude of the waveform is increased when the arc is generated, and when the arc is not generated, a waveform similar to that of corona discharge appears. Referring to FIG. 7, in the case of corona discharge, a conductive path is formed on the surface of the insulator 11 to generate a surface discharge. As shown in FIG. In addition, referring to FIG. 8, since the corona proceeds for a considerable period of time, cracking of the insulator proceeds, so that the waveform having a larger amplitude than the waveform at the time of corona discharge appears continuously. By analyzing the detected waveforms as described above, it is possible to determine whether deterioration has occurred, an installation apparatus in which deterioration occurs, and the degree of deterioration progression.

As shown in the above figure, it can be seen that the intensity of vibration increases from the steady state to the tracking state. Therefore, the controller 37 may determine the deterioration state of the insulator 11 by analyzing the intensity of the ultra-high frequency vibration signal input through the sensor input terminal 32. For example, the control unit 37 is provided with an analysis program to determine whether the degradation of the insulation 11 occurs and the degree of degradation according to the intensity (amplitude, frequency and time) of the ultra-high frequency vibration signal. The analysis program may analyze whether the deterioration occurs and the degree of deterioration of the installation device 10 by analyzing the intensity of the voltage or current of the received microwave signal.

In addition, the control unit 37 may display the analysis result regarding whether the degradation and the degree of degradation to the outside. For example, the control unit 37 displays any one of safety, audible corona, visual corona, ozone, and flashover according to the waveform or intensity of the microwave signal. do. These indications can be displayed by text using the LCD or by LEDs.

FIG. 9 shows an example of the display unit 38 using LEDs, which can be easily recognized by an administrator by increasing the number of LED lamps or changing colors according to the degree of deterioration. In addition, the control unit 37 may further include an alarm 41 for generating a sound for notifying the manager when the high frequency signal exhibits a specific waveform or when the high frequency vibration signal having a predetermined intensity or more continues for a predetermined time. The alarm 41 may be an LED lamp or a buzzer.

And the results analyzed in each of the microwave signal receiver 3 is transmitted to the microwave monitoring device 5 of the remote location and then integrated management. The ultra-high frequency vibration monitoring device 5 is connected to a plurality of ultra-high frequency vibration signal receivers 3 and wired or wirelessly to predict the breakdown by re-analyzing the data analyzed by the ultra-high frequency vibration signal receiver 3 to prevent insulation breakdown. Necessary measures can be instructed, for example, to cut off the power to the switchboard or to repair or replace internal installation equipment that has undergone insulation degradation.

As shown in FIG. 10, the ultra-high frequency vibration monitoring apparatus 5 is a kind of computer, and stores or analyzes the analysis result of the ultra-high frequency vibration signal received from the ultra-high frequency vibration signal receiver 3. To this end, the ultra-high frequency vibration monitoring apparatus 5 is connected to the ultra-high frequency vibration signal receiver 2 through wired / wireless communication to receive a high frequency analysis result and a receiver 52 and data input through the receiver 52. Memory 56 to classify and store the data according to a unique number, and read and analyze the data stored in the memory 56 and compare it with a reference electrothermal fracture model to predict insulation breakdown of the installed device and display the result to the outside. The central control unit 57, a monitor 58 that displays the degree of deterioration of the installation device to the outside, and converts the analysis result into a communication protocol to be connected to a mobile phone or a portable communication device of an administrator through an internet network. It comprises a transmitter 59 for providing a wired and wireless communication port for performing data communication. And an input unit 54 for the administrator to input necessary data.

Hereinafter will be described an ultra-high frequency vibration sensor that can be applied to the degradation detection device of the present invention. As described above, the ultra-high frequency vibration sensor of the present invention may be an acceleration sensor or a laser vibration measuring device using a piezoresistive pressure sensor, a capacitive pressure sensor, or a proof mass. However, these sensors have a number of disadvantages, and as a preferred embodiment of the ultra-high frequency vibration sensor according to the present invention proposes an ultra-high frequency vibration sensor using a mechanical-electrical coupling.

That is, the structure of the acceleration sensor using the mass is designed in such a way that the mass is suspended from the spring structure. The basic principle is to estimate the input acceleration by measuring the displacement at the point where the inertia force of the mass balances with the restoring force of the spring when the acceleration is transmitted to the mass. However, the mass of conventional MEMS accelerometers has been limited to a few micrograms of mass and a frequency response of several tens of kHz. Reducing the mass of the mass to increase the frequency response range increases the mechanical noise of the acceleration sensor, which limits the frequency response range. Because of this feature, high frequency vibrations above 50 kHz have been measured using a laser vibrometer. However, laser vibration measuring instruments are not only expensive but also not suitable for measuring vibrations of large structures. In addition, when the piezoresistive pressure sensor or the capacitive pressure sensor is used in the high frequency band (more than the UHF band), there is a problem that the influence of the resistance component and the high frequency parasitic component of the semiconductor (Si series) increases as the frequency increases.

The ultra-high frequency vibration sensor using the mechanical-electrical coupling of the present invention applies an ion mass-based ultra-high frequency vibration sensor that simply detects mechanical vibrations of ultra-high frequency by using small particles of positive and negative ions in the electrolyte. This ion mass based microwave sensor uses sodium ions (Na + ) and chlorine ions (Cl ) in a 5.8 M sodium chloride (NaCl) electrolyte. The principle of measurement is to measure the ionic vibration potential (IVP) generated by mechanical-electrical coupling of ions.

Here, the mechanical-electrical coupling of ions is a phenomenon in which electrical potential of ions in the electrolyte is generated by external mechanical excitation when assuming that cations and anions are present in the electrolyte and that there is a difference in mass. In other words, by using the positive and negative ions in the electrolyte, it is possible to detect without applying a driving power to the sensor due to the self-charged nature of the ions. In addition, since the inertia difference of hydrated ions between cations and anions increases or decreases easily according to the type of electrolyte, it is possible to control the sensitivity of the vibration sensor. In addition, since there is no mass, the original characteristics can be guaranteed against impact.

Referring to FIG. 11, the ion mass-based ultra-high frequency vibration device 20 of the present invention includes an upper plate 21 having an electrolyte chamber 23 and a lower plate 22 having four electrodes. The whole chamber 23 of the upper plate 23 is composed of one main chamber 223 and two auxiliary chambers 224, the lower plate 22 is configured to contact the electrolyte of the main chamber 233 It consists of two gold-electrodes 25. The main chamber 23 of the upper plate 21 is a space in which electrolyte is injected, and the auxiliary chamber 224 symmetrically connected to both sides of the main chamber 223 through the microchannel is without damaging the main chamber 223. It is for injecting electrolyte. That is, the main chamber 223 is filled with 5.8 M sodium chloride (NaCl) electrolyte through the auxiliary chamber 224. The inner end of the measuring electrode 25 of the lower plate 21 is a triangular electrode designed in two pairs to measure vibration in two axial directions. The electrodes are spaced apart at regular intervals.

Therefore, when the ion mass-based ultra-high frequency vibration device 20 according to the present invention is installed in close contact with the insulator 11 of the installation device, the electrolyte filled in the main chamber 223 by the ultra-high frequency vibration transmitted through the insulator 11 is provided. When mechanical vibration is applied, vibration is transmitted to the ions in the electrolyte in the form of an acoustic wave. When the seismic waves are transferred to the ions in the electrolyte, the relative displacement due to the inertia difference between the cation and the anion occurs. The potential generated by the relative displacement difference is measured through the electrodes 25 across the electrolyte. The electrode 25 outputs an ultra-high frequency vibration signal in an analog form such as the magnitude of the voltage. That is, the vibration of the insulator 11 is output as an electrical signal by the ion mass-based ultra-high frequency vibration device 20 and the waveform of the output is in the form of oscillation. In addition, the microwave signal is transmitted to the microwave signal receiver (3).

And, Figure 12 shows another embodiment of the degradation detection device of the present invention, in particular, shows a real-time degradation detection device using an ultra-high frequency vibration sensor and an ultra-high frequency vibration signal receiver using a radio frequency identification (RFID) system. As described above, the present invention is to install a plurality of ultra-high frequency vibration sensor inside the switchboard, it is difficult to determine the installation position of the dozens of sensors and there is a lot of difficulty in the connection wire processing of each sensor. Therefore, there is a strong demand for a method of wirelessly communicating by omitting the connection wires 27 connecting the respective sensors 2.

As shown in FIG. 12, the degradation detection apparatus 200 according to the present invention includes an ultra-high frequency vibration signal receiver 3 having a reader 6 for transmitting a question signal using an RF signal of a predetermined frequency band, and It consists of an ultra-high frequency vibration sensor (2) with a built-in tag (7) for transmitting the response signal containing the identification information by performing a backscatterd modulation of the RF signal transmitted by the reader (6) of the microwave signal receiver (3) . In this case, the ultra-high frequency vibration sensor 2 is attached to the insulator 11 of the installation device 10 inside the switchboard 100, respectively, the ultra-high frequency vibration signal receiver 3 is one on the front of the corresponding switchboard 100 Is installed.

Specifically, referring to FIG. 13, the reader 6 of the ultra-high frequency vibration signal receiver 3 includes an RF transmitter 61 for modulating and transmitting an RF signal, an RF receiver 62 for receiving and demodulating an RF signal; And a frequency synthesizer 63 for oscillating a high frequency in a predetermined frequency band, a microprocessor 64 for processing a received or transmitted signal, and an antenna 65 for transmitting and receiving an RF signal in a predetermined frequency band.

The ultra-high frequency vibration sensor 2 is the same as a conventional passive tag, and includes a high frequency vibration element 20, a tag 7, and an antenna 75, and a battery is not built in. At this time, the tag 7 is a kind of IC chip, and is provided with an RF circuit 74, a control logic 76, and a memory 77 for transmitting and receiving high frequency signals. In addition, a coil 78 for receiving electromagnetic waves generated from the switchboard 100 and a rectifier 79 for converting the received AC electromagnetic waves into a DC power supply are further provided. In addition, the antenna 75 can be used without providing the coil 78. In this case, the antenna 75 is a rectenna in which the rectifier 79 is combined as a dipole antenna. The rectana has a structure in which a rectifier diode is connected to the center of the dipole antenna. Therefore, the antenna 75 may receive the AC-type electromagnetic waves radiated from the switchboard and convert it to DC power. The DC power rectified by the rectifier 79 is used as a power source for operating the RF circuit, the control logic 76 and the memory 77.

The tag 7 receives and demodulates the RF signal of the reader 6 and transmits a response signal including the information stored in the memory 77 based on the demodulated signal. The ultra-high frequency vibration signal measured by the ultra-high frequency vibration element 20 is transmitted to the control logic 76 and then stored in the memory 77. The tag 7 receives the RF signal radiated from the reader 6 and reflects it as it is, modulates the response signal to the reflected high frequency signal, and then radiates to the outside through the antenna 75. In addition, the tag 7 may be provided with a capacitor for storing the power rectified by the rectifier (79).

The operation of the real-time deterioration detection apparatus using the radio frequency identification (RFID) system will be described briefly. First, the reader 6 embedded in the microwave signal receiver 3 transmits a question signal through an RF signal at predetermined time intervals. Then, the tags 7 embedded in the plurality of microwave vibration sensors 2 in the switchboard 100 transmit the microwave signals stored in the memory 77 by reflecting and modulating the RF signals received from the reader 6. do. At this time, the ultra-high frequency vibration element 20 converts the ultra-high frequency vibration transmitted through the insulator into an electrical signal and stores it in the memory 77 in advance. And the ultra-high frequency vibration signal received from the tags (7) is signal-processed in the microprocessor 64 of the reader 6, and then sent to the control unit 37 of the microwave signal receiver 3 to analyze the waveform.

As described above, the real-time deterioration detection apparatus using the RFID system according to the present invention can connect wirelessly a plurality of ultra-high frequency vibration sensors installed inside the switchboard, thereby simplifying the wiring structure inside the switchboard. have.

As described above, another feature of the present invention is to install an ultra-high frequency vibration sensor on the insulator of each installation device. Therefore, hereinafter will be described an embodiment for installing the ultra-high frequency vibration sensor according to the present invention to the insulator.

As described above, the ultra-high frequency vibration sensor 2 of the present invention is installed in the insulator 11 of the installation device 10 such as a bushing, a support insulator, and a breaker installed in the switchboard 100. Referring to FIG. 3, the support insulator is wrapped with an insulator 11 having a plurality of corrugations formed on a surface thereof, and an upper fixing part for fixing a cable or a bus bar is formed at an upper end thereof, and a cable or bus bar at a lower end thereof. The lower fixing part for fixing a back is provided. At this time, the insulator 11 is made of ceramic or insulating plastic. In order to detect the ultra-high frequency vibration transmitted through the insulator 11, the ultra-high frequency vibration sensor 2 according to the present invention is installed in close contact with the insulator.

To this end, first, in the case of Figure 3, the installation groove 12 is formed in a size that can be inserted into the ultra-high frequency vibration sensor 2 at the lower end of the insulator (11). The installation groove 12 may be formed in the process of manufacturing the insulator 11 or may be formed through a separate process after manufacturing. The ultra-high frequency vibration sensor 2 is inserted into the installation groove 12 and then sealed with an insulating material. The insulating material serves to fix the ultra-high frequency vibration sensor 2 and to protect the ultra-high frequency vibration sensor 2 from the external high voltage. In addition, the insulating material serves to block external noise. At this time, the connecting wire 27 is exposed to the outside through the insulating material.

Subsequently, FIG. 14 shows another method of installing the ultra-high frequency vibration sensor 2 on the insulator 11, and in particular, various types of bushings for transformers, wall bushings, underground open connection bushings, processing open connection bushings, and dead end bushings. Applicable to insulators. As shown, an installation hole 15 for installing the ultra-high frequency vibration sensor 2 on one side of the insulator 11 is formed. Preferably, the installation hole 15 is formed when the insulator 11 is formed. The ultra-high frequency vibration sensor 2 is inserted into the installation hole 15 and then sealed with a predetermined insulating material. The rest of the configuration is as described above. In this way, since the ultra-high frequency vibration sensor 2 is installed to be in close contact with the insulator 11 such as the support insulator, it is possible to accurately detect the ultra-high frequency vibration transmitted through the insulator 11.

And, Figure 15 shows another method for installing the ultra-high frequency vibration sensor according to the present invention to the insulator, in particular, to form an annular installation space 16 at the bottom of the insulator 11 and then to the annular installation space The band-shaped ultra-high frequency vibration sensor 2 is wound up and installed. This method is suitable for a radio frequency method in which a vibration device and a wireless communication module are mounted on a flexible substrate and a relatively large space is required to install an antenna and a coil.

Subsequently, FIG. 16 shows another method of installing another ultra-high frequency vibration sensor according to the present invention. In particular, an insulating cap having a space in which the ultra-high frequency vibration sensor 2 is installed on the outer side of the insulator 11 may be provided. 19) is fixed through the fastening means. Therefore, after filling the insulating material in the insulating cap 19, the ultra-high frequency vibration sensor (2) is installed, and then firmly adhered to the surface of the insulator (11), the insulating cap (19) fastening means of the insulator (11) Fix in a fastening manner.

 As described in detail above, the present invention relates to a switchboard deterioration detection device, and in particular, each installation so as to detect the ultra-high frequency vibration generated when deterioration occurs in the insulator of the installation device installed inside the switchboard. Ultra high frequency vibration sensor is installed on the insulator of the device, and the high frequency vibration signal measured by this high frequency vibration sensor is analyzed to find out whether or not the internal deterioration of the device is deteriorated and to supply the switchboard automatically. The present invention relates to a switchgear deterioration detection device capable of preventing a safety accident by cutting off power.

In addition, in the above described with reference to the accompanying drawings, a preferred embodiment of the real-time deterioration detection apparatus using the ultra-high frequency vibration signal in accordance with the present invention, but the scope of the present invention is not limited to these embodiments, those skilled in the art Since various embodiments may be embodied from the contents set forth in the specification, it should be interpreted as belonging to the claims described below.

2: sound wave vibration sensor 3: ultra-high frequency vibration signal receiver
5: ultra-high frequency vibration monitoring device 6: reader
7: Tag 10: installation appliance
11: insulator 12: mounting groove
15: installation hole 19: insulation cap
20: vibrating element 21: top plate
22: lower plate 23: chamber
25: electrode 32: sensor input terminal
33: amplifier and filter 35: A / D converter
36: memory 37: control unit
38: display section 41: warning section
52: receiver 56: memory
57: central control unit 58: monitor
61: RF transmitter 62: RF receiver
63: frequency synthesizer 64: microprocessor
74: RF circuit 75: antenna
76: control logic 77: memory
78: coil 79: rectifier
100: switchboard

Claims (4)

  1. In the deterioration detection device for monitoring the insulation deterioration of the insulation provided in the switchboard,
    A plurality of ultra-high frequency vibration sensors which are respectively embedded in the insulators of the plurality of installation devices installed inside the switchboard and directly detect the ultra-high frequency vibrations generated by partial discharge and transmitted through the insulator when the insulator deteriorates;
    It is installed on the front of the switchboard and is connected to the plurality of ultra-high frequency vibration sensor, and receives and stores the ultra-high frequency vibration signal measured by the ultra-high frequency vibration sensor through a sensor input terminal, according to the pattern or intensity of the ultra-high frequency vibration signal A high frequency vibration signal receiver which displays the deterioration state of the device to the outside and converts the result into a protocol capable of wired and wireless communication and transmits the result to an ultra high frequency vibration monitoring device installed in the central monitoring panel;
    The ultra-high frequency vibration sensor is embedded in an installation groove formed in the insulator of the installation device, but installed in close contact with the insulator to detect the ultra-high frequency vibration signal transmitted through the insulator, and the rubber material is used for the other side Sealed to prevent the vibration signal transmitted from the outside to be transmitted so as to detect an installation device in which insulation deterioration occurs in real time;
    The ultra-high frequency vibration monitoring device receives and stores data on the deterioration state of the internal insulation of the switchboard from the plurality of ultra-high frequency vibration signal receivers, and analyzes the input data to predict insulation breakdown or to a remote manager by wired or wireless Analyzes the memory for storing the ultra-high frequency vibration signal received through the sensor input terminal for warning, and the waveform of the ultra-high frequency vibration signal stored in the memory and compares with the reference partial discharge model to analyze the degradation state of the installation device Real-time degradation detection device using an ultra-high frequency vibration sensor, characterized in that it comprises a control unit for transmitting to the outside through a communication unit.
  2. The method of claim 1,
    The ultra-high frequency vibration receiver includes: an RF transmitter for modulating and transmitting an RF signal, an RF receiver for receiving and demodulating an RF signal, a frequency synthesizer for oscillating a high frequency of a predetermined frequency band, a microprocessor for processing a received or transmitted signal; Real-time degradation detection device using an ultra-high frequency vibration sensor characterized in that the reader further comprises an antenna for transmitting and receiving RF signals of a predetermined frequency band.
  3. The method of claim 1,
    The ultra-high frequency vibration sensor is a real-time degradation detection device using an ultra-high frequency vibration sensor, characterized in that the tag including a RF circuit, a control logic and a memory for transmitting and receiving high frequency signals.
  4. delete
KR20110046935A 2011-05-18 2011-05-18 Insulation deterioration monitoring system using vibration detection and metal enclosed switchgears using the same KR101077441B1 (en)

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KR101232750B1 (en) 2012-07-10 2013-02-13 김동현 Distributing board and motor control center, cabinet panel having an insulation degradation diagnosis system for detecting arc or corona generation using contactless complex sensors
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KR101515435B1 (en) * 2014-06-02 2015-05-04 지투파워 (주) High voltage distributing board, low voltage distributing board, motor contorl board, distributing board for detecting arc or corona discharge using transient earth voltage and ultrasonic waves
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CN104020403A (en) * 2014-06-20 2014-09-03 国家电网公司 Diagnostic system for composite apparatus fault positioning
US10395032B2 (en) 2014-10-03 2019-08-27 Nokomis, Inc. Detection of malicious software, firmware, IP cores and circuitry via unintended emissions
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KR101812118B1 (en) * 2017-06-21 2018-01-25 주식회사 에너솔라 Partial and arc discharging detector and method thereof of high voltage distributing board, low tension voltage distributing board, distributing board, sunlight connector band, motor control board, ESS system
KR101812119B1 (en) * 2017-06-21 2017-12-26 주식회사 에너솔라 The hybrid synthesis disaster prevention system of high voltage distributing board, low tension voltage distributing board, distributing board, sunlight connector band, motor control board, ESS system

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