JP2008026070A - Partial discharge diagnosis device of gas-insulated device - Google Patents

Partial discharge diagnosis device of gas-insulated device Download PDF

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Publication number
JP2008026070A
JP2008026070A JP2006197083A JP2006197083A JP2008026070A JP 2008026070 A JP2008026070 A JP 2008026070A JP 2006197083 A JP2006197083 A JP 2006197083A JP 2006197083 A JP2006197083 A JP 2006197083A JP 2008026070 A JP2008026070 A JP 2008026070A
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partial discharge
vibration sensor
vibration
noise
gas
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JP2006197083A
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Japanese (ja)
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Koji Ueda
晃司 上田
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Mitsubishi Electric Corp
三菱電機株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a partial discharge diagnosis device of a gas-insulated device capable of diagnosing accurately generation of a partial discharge in a metal tank without being influenced by noise, even when detecting unspecified noise from the outside. <P>SOLUTION: This device is equipped with a first vibration sensor 2 for detecting mechanical vibration 16 generated by the partial discharge in the metal tank 11 of the gas-insulated device and noise from the outside, a second vibration sensor 3 for detecting the noise from the outside, and a determination part 4 for determining generation of the partial discharge based on the difference between outputs from both sensors. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a partial discharge diagnosis device for a gas insulation device that diagnoses the occurrence of partial discharge caused by an insulation failure of the gas insulation device.
  A gas insulation device is a metal tank in which an electrically insulating gas is sealed and a high voltage conductive part is supported and stored by an insulating member. When this occurs, a partial discharge occurs between the high-voltage conductive part and the metal tank. For this reason, it is necessary to accurately diagnose the occurrence of this partial discharge for maintenance and inspection of the gas insulation device.
However, it is difficult to directly measure the partial discharge generated inside the sealed metal tank, and it is necessary to diagnose the occurrence of the partial discharge by an indirect phenomenon such as an electromagnetic wave generated by the partial discharge or a generated gas component. In view of this, an apparatus has been proposed in which a vibration sensor is attached to the wall surface of a metal tank, and the occurrence of partial discharge is diagnosed by detecting mechanical vibration of the metal tank generated by partial discharge. (For example, refer to Patent Document 1.)
JP-A-4-331382 (page 2-3, Fig. 1)
  In the apparatus that detects the mechanical vibration as described above and diagnoses the occurrence of partial discharge, the vibration sensor also detects external noise. If this noise is such that the frequency range and source can be specified, identify whether the signal component is due to mechanical vibration or noise from the signal characteristics such as the frequency band and period of the signal component, It is possible to avoid the influence of noise. However, when unspecified noise such as mobile phone communication signal or device noise is detected, it is difficult to identify whether the signal component is due to noise or not and remove the noise component. There was a problem of making a wrong diagnosis.
  The present invention has been made to solve the above-described problems, and is capable of accurately diagnosing the occurrence of partial discharge without being affected by noise even when unspecified noise is detected. An object of the present invention is to obtain a partial discharge diagnostic apparatus.
  A partial discharge diagnostic device for a gas insulation device according to the present invention includes a first vibration sensor for detecting mechanical vibration and external noise generated by partial discharge in a metal tank, and a second for detecting external noise. A vibration sensor and a determination unit that determines occurrence of partial discharge based on a difference between outputs of both sensors.
  Since the present invention eliminates the noise component by subtracting the output of the vibration sensor that detects the mechanical vibration caused by the partial discharge and the noise from the outside and the output of the vibration sensor that detects the noise from the outside, A partial discharge diagnostic device for a gas insulating device that can accurately diagnose occurrence of partial discharge without being affected is obtained.
Embodiment 1 FIG.
1 and 2 show a partial discharge diagnostic device for a gas insulation device according to Embodiment 1 of the present invention. FIG. 1 is a block diagram showing the partial discharge diagnostic device for a gas insulation device. FIG. 2 shows the partial discharge diagnostic device. FIG. In FIG. 1, a partial discharge diagnostic apparatus 1 includes a first vibration sensor 2, a second vibration sensor 3, and a determination unit 4 that receives outputs from both sensors. The first vibration sensor 2 is affixed to the outer peripheral surface 11a of the metal tank 11 of the gas insulation device 10 using a gel (not shown) that facilitates transmission of mechanical vibration, and the second vibration sensor 3 is the metal The tank 11 is affixed to the surface of the installation base 12 that fixes the tank 11 to the ground. The first vibration sensor 2 and the second vibration sensor 3 are vibration sensors having the same specifications, and the cables connecting the vibration sensors 2 and 3 and the determination unit 4 so that the outputs when the same noise is detected match. The span is adjusted.
The gas insulating apparatus 10 includes a substantially cylindrical metal tank 11 filled with an insulating gas such as SF 6 and grounded, and an insulating material 13 in the metal tank 11 as shown in the right cross section of FIG. A high-voltage conductive portion 14 that is insulated and supported from the metal tank 11 is provided. And it is being fixed to the ground by the installation stand 12 connected with the said metal tank 11 by bolt fastening or welding.
  As shown in FIG. 2, the first vibration sensor 2 and the second vibration sensor 3 are connected to input terminals 4 a and 4 b of the determination unit 4. The determination unit 4 includes a difference circuit 5 and a determination circuit 6, and the input terminals 4 a and 4 b are connected to the input terminals 5 a and 5 b of the difference circuit 5, respectively. The difference circuit 5 makes a difference between the sensor output of the first sensor 2 input from the input terminal 5a and the sensor output of the second sensor 3 input from the input terminal 5b, and outputs the difference output from the output terminal 5c. The output terminal 5c is connected to the input terminal 6a of the determination circuit 6. The determination circuit 6 determines whether or not the differential output that has entered from the input terminal 6a is higher than a reference value. A signal notifying the occurrence of partial discharge is output from the output terminal 6b. The output terminal 6b is connected to the output terminal 4c of the determination unit 4, and outputs a signal to an alarm device, a recorder, etc. (not shown) connected to this terminal.
Next, the operation will be described.
When an insulation failure occurs in the gas insulation device 10, a partial discharge occurs between the high voltage conductive portion 14 that is a high voltage portion and the metal tank 11 that is at the ground potential. When partial discharge occurs, the metal tank 11 is impacted by the discharge energy and mechanical vibrations are generated. The generated mechanical vibration propagates through the tank wall 11b of the metal tank 11. Since the first vibration sensor 2 is affixed to the tank outer peripheral surface 11 a, the first vibration sensor 2 detects mechanical vibration in the metal tank 11 and converts it into an electrical signal, and the input terminal 4 a of the determination unit 4. Output to. At this time, if noise is present outside, the noise is also detected. Therefore, the sensor output 22 output from the first vibration sensor 2 to the input terminal 4a includes a vibration component 22V due to mechanical vibration as shown in FIG. Both noise components 22N due to external noise are included.
  On the other hand, mechanical vibration due to partial discharge has a frequency of several kHz or more, and the mechanical vibration has a high frequency and a very small strength. The vibration is greatly detected at the welded part and the joined part by bolt fastening. Decreases to a level where it cannot be done. Therefore, in the installation stand 12 joined to the metal tank 11, the mechanical vibration due to the partial vibration is reduced to a level that cannot be detected, and the second vibration sensor 3 installed on the installation stand 12 detects the mechanical vibration due to the partial vibration. Never do. However, since it is installed in the same insulating device 10 as the first vibration sensor 2, the same noise as the noise detected by the first vibration sensor is detected. Therefore, from the second vibration sensor 3, as shown in FIG. 3, a sensor output 23 having a noise component 23N having the same pattern as the noise component 22N included in the sensor output of the first vibration sensor 2 is applied to the input terminal 4b. Is output.
The sensor outputs 22 and 23 output to the input terminals 4a and 4b are transmitted to the input terminals 5a and 5b as they are, and are subjected to differential processing in the difference circuit 5. At this time, the noise component 22N of the sensor output 22 output from the first vibration sensor 2 and the noise component 23N of the sensor output 23 output from the second vibration sensor 3 are caused by the same noise as described above. Since they are things, the waveforms are equal and synchronized. Therefore, the noise components 22N and 23N are canceled by the difference processing, and as shown in FIG. 3, the difference output 25 in which the vibration component 25V due to the partial discharge detected by the first vibration sensor 2 remains and the noise components 22N and 23N due to noise disappear. Is output from the output terminal 5c. In the determination circuit 6, as shown in FIG. 4, it is determined that the partial discharge has occurred at the time ts when the output of the differential output 25 received from the input terminal 6a becomes higher than the reference value e 26, and the fact that the partial discharge has occurred is determined. The partial discharge generation signal 26s shown is output from the output terminal 6b. The output 26 from the determination circuit 6 is output to an alarm device or recorder (not shown) via the output terminal 4c of the determination unit 4, and the occurrence of partial discharge is notified by the partial discharge generation signal 26s, and the occurrence frequency is recorded. It can be used as data for determining the progress of insulation failure of the gas insulation device 10.
  As described above, the first vibration sensor 2 is installed on the outer peripheral surface 11a of the metal tank 11 to which the mechanical vibration generated by the partial discharge is transmitted, and the second vibration sensor 3 is installed on the installation base 12 where the mechanical vibration is not transmitted. The first vibration sensor 2 detects mechanical vibrations and external noise generated by partial discharge, and the second vibration sensor 3 detects external noises. By detecting this, it is possible to accurately diagnose the occurrence of partial discharge without being affected by noise, even if the signal characteristics such as frequency band and signal period are unspecified, as well as stationary noise. become able to. In particular, since the second vibration sensor is installed on the same metal tank installation base as the first vibration sensor, the second vibration sensor detects the same noise as the noise detected by the first vibration sensor in the same waveform. Therefore, the noise component can be reliably removed by the difference processing.
  Note that an end plate (not shown) of the metal tank 11, an inspection port flange (not shown), and an operation box (not shown) of the gas insulating device 10 are also provided on the outer peripheral surface 11 a of the metal tank 11 in the same manner as the installation base 12. Is connected to the tank wall 11b forming a through a connecting portion such as welding or bolt fastening. Therefore, even when the second vibration sensor 3 is installed on the end plate of the metal tank, the inspection port flange, or the operation box where the first vibration sensor 2 is installed, the second vibration sensor 3 is a machine by partial discharge. The same effects as those in the above embodiment can be obtained without detecting vibration.
  Moreover, in the said embodiment, although comprised so that the output 26 of the determination circuit 6 might be output outside, it is also possible to comprise so that the difference output 25 of the difference circuit 5 can be output directly outside.
Embodiment 2. FIG.
5 and 6 show a partial discharge diagnostic device for a gas insulation device according to Embodiment 2, FIG. 5 shows a sensor, and FIG. 6 is a configuration diagram showing a partial discharge diagnostic device for a gas insulation device. In FIG. 5, the second vibration sensor 3 is integrated with the first vibration sensor 2 via a vibration isolating material 7 so that the respective installation surfaces 3 a and 2 a face each other. Then, as shown in FIG. 6, the installation of the sensor is completed by attaching the installation surface 2a of the first vibration sensor 2 to the outer peripheral surface 11a of the metal tank 11 using a gel. Thereby, the first vibration sensor 2 can detect the mechanical vibration 16 in the metal tank 11 and also detects noise from the outside. On the other hand, the mechanical vibration in the metal tank 11 is not transmitted to the second vibration sensor 3 by the vibration isolating material 7, but noise from the outside is detected.
  In the second embodiment, since the first vibration sensor 2 and the second vibration sensor 3 are integrated via the vibration isolator 7, the sensor integrated in one place on the outer peripheral surface 11a of the metal tank 11 The partial discharge of the gas insulating device 10 can be diagnosed just by pasting as in the first embodiment. In particular, since the first vibration sensor 2 and the second vibration sensor 3 are close to each other only by being separated by the vibration isolating material 7, consistency and synchronism of signal intensity when detecting noise from the outside. Therefore, it is possible to diagnose the occurrence of partial discharge by effectively removing noise components by differential processing.
  In the present embodiment, since the sensors having the same specifications are integrated so that the respective installation surfaces face each other outward, the sensor on the side attached to the outer peripheral surface of the metal tank is the first vibration. The sensor and the other function as a second vibration sensor. In other words, when attaching the sensor to the outer peripheral surface of the metal tank, it is not necessary to check the front and back of the sensor, and it is possible to accurately diagnose the occurrence of partial discharge regardless of which surface is attached, as in the above embodiment. It becomes possible.
Embodiment 3 FIG.
FIG. 7 is a block diagram of the partial discharge diagnostic apparatus according to the third embodiment. In the figure, the determination unit 4 is provided with high-pass filters 8 a and 8 b that cut signals of 100 kHz or less between the input terminals 4 a and 4 b and the input terminals 5 a and 5 b of the difference circuit 5.
In the third embodiment, since the difference processing is performed after the output 22 of the first vibration sensor 2 and the output 23 of the second vibration sensor 3 are passed through the high-pass filter, the output of the sensor output to the difference circuit 5 Thus, low-frequency noise components 22L and 23L as shown in FIG. 3 in the first embodiment are removed. These low-frequency noise components 22L and 23L are not synchronized, and it is difficult to remove them only by the difference processing. Therefore, the case of not using the high-pass filter 8a, the 8b, the reference value e 26 determines the occurrence of partial discharge must be set higher than the noise component 25L of the low frequency, when the vibration component due to partial discharge is weak It was difficult to diagnose the occurrence of partial discharge. However, in the present embodiment, the asynchronous low-frequency noise components 22L and 23L are removed by the high-pass filters 8a and 8b, so that the signal 35 output from the difference circuit 5 is low-frequency noise as shown in FIG. The component is removed. Therefore, the reference value e 36 for determining the occurrence of partial discharge can be set lower than the reference value e 26 in the first embodiment, and even a weak vibration component 35V that cannot be detected only by the difference processing is regarded as noise. It can be distinguished and detected with high sensitivity, and the occurrence of partial discharge can be diagnosed.
  In the third embodiment, the high-pass filters 8a and 8b are provided between the vibration sensors 2 and 3 and the difference circuit 5, and low-frequency noise components are removed for each of the sensor outputs 22 and 23. A configuration in which a low-frequency noise component is removed from the differential output 25 by being provided between the determination circuits 6 is also possible.
  In the first or second embodiment, if the acoustic emission sensors that detect only a high frequency component of 100 kHz or higher are used as the first and second vibration sensors 2 and 3, low-frequency noise components that are not synchronized are sensors. It is not included in the output. In this case, even if a high-pass filter is not provided in the determination unit, a weak vibration component can be detected with high sensitivity as in the third embodiment, and the occurrence of partial discharge can be diagnosed.
It is a block diagram which shows the partial discharge diagnostic apparatus of the gas insulation apparatus in Embodiment 1 of this invention. It is a block diagram which shows the partial discharge diagnostic apparatus in Embodiment 1 of this invention. It is a wave form diagram which shows the output state of each part in Embodiment 1 of this invention. It is a wave form diagram which shows the output state of each part in Embodiment 1 of this invention. It is a figure which shows the sensor in Embodiment 2 of this invention. It is a block diagram which shows the partial discharge diagnostic apparatus of the gas insulation apparatus in Embodiment 2 of this invention. It is a block diagram which shows the partial discharge diagnostic apparatus in Embodiment 3 of this invention. It is a wave form diagram which shows the output state of each part in Embodiment 3 of this invention.
Explanation of symbols
1 partial discharge diagnostic device, 2 first vibration sensor, 3 second vibration sensor,
4 Judgment part, 7 Anti-vibration material, 8a, 8b High-pass filter,
10 gas insulation device, 11 metal tank, 12 installation base, 14 high voltage conductive part,

Claims (6)

  1. In the partial discharge diagnostic device of the gas insulation device for detecting the partial discharge generated inside the metal tank in which the insulating gas is sealed and the high voltage conductive part is insulated and supported,
    A first vibration sensor for detecting mechanical vibrations generated by partial discharge in the metal tank and noise from the outside;
    A second vibration sensor for detecting noise from the outside;
    A determination unit that determines occurrence of partial discharge based on a difference between outputs of the first vibration sensor and the second vibration sensor;
    A partial discharge diagnostic device for a gas insulation device comprising:
  2. The partial discharge diagnostic apparatus for a gas insulating device according to claim 1, wherein the first vibration sensor is installed on an outer peripheral surface of the metal tank.
  3. 3. The partial discharge diagnostic apparatus for a gas insulation device according to claim 1, wherein the second vibration sensor is installed on an installation base of the metal tank. 4.
  4. The partial discharge diagnostic apparatus for a gas insulating device according to claim 2, wherein the second vibration sensor is integrated with the first vibration sensor so as to face each other with a vibration isolating material interposed therebetween.
  5. The partial discharge diagnosis apparatus for a gas insulating apparatus according to any one of claims 1 to 4, wherein the determination unit includes a high-pass filter.
  6. The partial discharge diagnostic apparatus for a gas insulating device according to any one of claims 1 to 4, wherein the first and second vibration sensors are acoustic emission sensors.

JP2006197083A 2006-07-19 2006-07-19 Partial discharge diagnosis device of gas-insulated device Pending JP2008026070A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013035080A (en) * 2011-08-04 2013-02-21 Toyo Advanced Technologies Co Ltd Wire saw
CN103777124A (en) * 2014-01-27 2014-05-07 国网上海市电力公司 Breakdown failure positioning method of GIS on-site voltage withstand test based on vibration test
CN104020403A (en) * 2014-06-20 2014-09-03 国家电网公司 Diagnostic system for composite apparatus fault positioning
WO2016098644A1 (en) * 2014-12-18 2016-06-23 三菱電機株式会社 Partial discharge detection method for power apparatus, partial discharge detection device, partial discharge detection system, power apparatus for which partial discharge detection was performed using foregoing, and power apparatus manufacturing method including partial discharge detection method
JP2016180598A (en) * 2015-03-23 2016-10-13 株式会社東芝 Detection system and detection method

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Publication number Priority date Publication date Assignee Title
JPH04194762A (en) * 1990-11-28 1992-07-14 Toshiba Corp Device for monitoring partial discharge of electric apparatus
JPH04331382A (en) * 1991-05-07 1992-11-19 Mitsubishi Electric Corp Insulation diagnostic apparatus for gas insulated device
JPH04353776A (en) * 1991-05-31 1992-12-08 Toshiba Corp Monitoring device for partial discharge of transformer
JPH08105929A (en) * 1994-10-04 1996-04-23 Toshiba Corp Partial discharge detection device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04194762A (en) * 1990-11-28 1992-07-14 Toshiba Corp Device for monitoring partial discharge of electric apparatus
JPH04331382A (en) * 1991-05-07 1992-11-19 Mitsubishi Electric Corp Insulation diagnostic apparatus for gas insulated device
JPH04353776A (en) * 1991-05-31 1992-12-08 Toshiba Corp Monitoring device for partial discharge of transformer
JPH08105929A (en) * 1994-10-04 1996-04-23 Toshiba Corp Partial discharge detection device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013035080A (en) * 2011-08-04 2013-02-21 Toyo Advanced Technologies Co Ltd Wire saw
CN103777124A (en) * 2014-01-27 2014-05-07 国网上海市电力公司 Breakdown failure positioning method of GIS on-site voltage withstand test based on vibration test
CN104020403A (en) * 2014-06-20 2014-09-03 国家电网公司 Diagnostic system for composite apparatus fault positioning
WO2016098644A1 (en) * 2014-12-18 2016-06-23 三菱電機株式会社 Partial discharge detection method for power apparatus, partial discharge detection device, partial discharge detection system, power apparatus for which partial discharge detection was performed using foregoing, and power apparatus manufacturing method including partial discharge detection method
JP6045757B2 (en) * 2014-12-18 2016-12-14 三菱電機株式会社 Power device partial discharge determination method, partial discharge determination device, partial discharge determination system, and method of manufacturing power device including partial discharge determination method
US10209292B2 (en) 2014-12-18 2019-02-19 Mitsubishi Electric Corporation Partial discharge determination method, partial discharge determination apparatus, and partial discharge determination system for power device, and method for manufacturing power device including the partial discharge determination method
JP2016180598A (en) * 2015-03-23 2016-10-13 株式会社東芝 Detection system and detection method
US10444197B2 (en) 2015-03-23 2019-10-15 Kabushiki Kaisha Toshiba Detection system and detection method
US10551353B2 (en) 2015-03-23 2020-02-04 Kabushiki Kaisha Toshiba Detection system and detection method

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