JP2012193975A - Electric apparatus insulation diagnostic device - Google Patents

Electric apparatus insulation diagnostic device Download PDF

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JP2012193975A
JP2012193975A JP2011056328A JP2011056328A JP2012193975A JP 2012193975 A JP2012193975 A JP 2012193975A JP 2011056328 A JP2011056328 A JP 2011056328A JP 2011056328 A JP2011056328 A JP 2011056328A JP 2012193975 A JP2012193975 A JP 2012193975A
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frequency
antenna
characteristic frequency
data
level
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Etsuo Hotoda
保戸田悦生
Naoki Okada
岡田直喜
Hideto Oki
大木秀人
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Nissin Electric Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To solve such problems associated with conventional technique that, for monitoring a characteristic frequency in space, it is necessary for a person to perform initial setting because each region has a different characteristic frequency, and also it is possible to obtain erroneous detection because sometimes the characteristic frequency suddenly disappears, for example, a broadcast is stopped when monitoring a frequency of a broadcast wave or a communication wave as the characteristic frequency, and for generating the characteristic frequency from the exterior, it is impossible for a standing device to generate the characteristic frequency because it is necessary for a person to generate the characteristic frequency.SOLUTION: For determining whether an antenna is normally working or not, it can be determined based on a frequency level which decreases in a broadband when an antenna cable is disconnected. Thus, an electric apparatus insulation diagnostic device comprises determination means which monitors a frequency level in a broadband and compares the frequency level with reference data (threshold) which is measured in advance to determine that, when the frequency level is equal to or less than a determination level, abnormality occurs in a reception antenna of the electric apparatus insulation diagnostic device.

Description

本発明は、ガス絶縁開閉器（ＧＩＳ：Gas Insulated Switchgear）やガス遮断器（ＧＣＢ：Gas Circuit Breaker）や電力用トランスなどの電力用機器の絶縁診断装置に関するものである。   The present invention relates to an insulation diagnostic device for power equipment such as a gas insulated switchgear (GIS), a gas circuit breaker (GCB), and a power transformer.

ガス絶縁開閉器などの電気機器において、何らかの原因で絶縁性能が劣化すると、アーク閃絡事故が発生する前に予兆現象として部分放電が発生することが知られている。電気機器絶縁診断装置は、前記部分放電をなるべく軽微な初期の段階で検出して、電気機器のアーク閃絡事故を未然に防止するものである。   In electrical equipment such as a gas insulated switch, it is known that if the insulation performance deteriorates for some reason, partial discharge occurs as a predictive phenomenon before an arc flashover accident occurs. The electrical equipment insulation diagnosis device detects the partial discharge at the initial stage as light as possible to prevent an arc flash accident of the electrical equipment.

前記部分放電を検出する手段として、部分放電により発生する電磁波を検出する手段が知られている。具体的構成としては、電気機器の部分放電が発生する可能性のある複数の場所にアンテナを配置し、各アンテナの出力信号は、セレクタを介して判定装置に入力される。判定装置では、セレクタの切り換えにより１つの計測チャネルを選択し、その計測チャネルに接続されたアンテナが検出した信号から部分放電の有無を判定する。以後、判定装置は、セレクタを切り換えて、各計測チャネルについて部分放電の有無を判定し電気機器の絶縁診断を行う方法が知られている。しかしながら、アンテナの故障等、アンテナ側に問題がある場合は、正確な判定ができない。   As means for detecting the partial discharge, means for detecting an electromagnetic wave generated by the partial discharge is known. As a specific configuration, antennas are arranged at a plurality of places where partial discharge of an electric device may occur, and an output signal of each antenna is input to a determination device via a selector. The determination device selects one measurement channel by switching the selector, and determines the presence or absence of partial discharge from the signal detected by the antenna connected to the measurement channel. Thereafter, a method is known in which the determination apparatus switches selectors to determine the presence or absence of partial discharge for each measurement channel and perform an insulation diagnosis of the electrical equipment. However, when there is a problem on the antenna side such as an antenna failure, an accurate determination cannot be made.

アンテナの健全性機能を有した従来技術として、特開平９−２９２４３３等がある。前記公報で開示されている電気機器絶縁診断装置は、アンテナの健全性、アンテナケーブル、コネクタなどの接触不良、感度不良の異常検出機能を有する電気機器絶縁診断装置で、アンテナの健全性検出機能として２種類有している。前記アンテナの健全性検出機能の一つは、所定の放送波（テレビ放送波）が受信されたか否かで判定する方法と、もう一つは、模擬信号発生装置を有し、前記模擬信号が受信されたか否かで判定する方法が開示されている。アンテナケーブルの断線検出の手段として、特開平９−２９２４３３では、ある特定の周波数を監視することで断線検出を行なっている。このとき特定の周波数は空間の特徴的な周波数を選択してもよいし、外部から特定の周波数を発生させてもよい。   Japanese Patent Laid-Open No. 9-292433 is a prior art having an antenna soundness function. The electrical equipment insulation diagnostic device disclosed in the above publication is an electrical equipment insulation diagnostic device having an abnormality detection function for antenna health, poor contact of antenna cables, connectors, etc., and poor sensitivity. There are two types. One of the antenna health detection functions is a method of determining whether a predetermined broadcast wave (television broadcast wave) is received, and the other has a simulation signal generator, and the simulation signal is A method for determining whether or not a message has been received is disclosed. As means for detecting disconnection of an antenna cable, Japanese Patent Laid-Open No. 9-292433 detects disconnection by monitoring a specific frequency. At this time, a specific frequency may be selected as a specific frequency, or a specific frequency may be generated from the outside.

特開平９−２９２４３３号公報JP-A-9-292433

しかしながら、従来の技術では空間の特徴的な周波数を監視している場合、地域によって特徴的な周波数が異なるため、人による初期設定が必要になることや、特徴的な周波数が突然なくなってしまうことがある。例えば、常設形の場合においては、テレビ放送波のディジタル化対応により監視周波数の信号がなくなった場合に誤検知をしてしまう。また、テレビ放送波がない地域の対策として、模擬信号発生装置を具備しているが、コストアップと装置の大型化の原因となっている。   However, when the characteristic frequency of the space is monitored in the conventional technology, the characteristic frequency differs depending on the region, so that initial setting by a person is necessary or the characteristic frequency suddenly disappears. There is. For example, in the case of the permanent type, a false detection is made when there is no monitor frequency signal due to the digitization of television broadcast waves. In addition, as a countermeasure for areas where there is no TV broadcast wave, a simulation signal generator is provided, which causes an increase in cost and an increase in the size of the apparatus.

本発明は、電力機器絶縁診断装置において、地域が異なっても人手により監視周波数を設定変更する必要のない簡易で、安価な絶縁診断装置を提供することを目的とする。   SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and inexpensive insulation diagnosis apparatus that does not require manual setting change of a monitoring frequency even in different regions in a power equipment insulation diagnosis apparatus.

前記目的を達成する為に、本発明の本発明の電気機器絶縁診断装置は、アンテナケーブル断線時は広帯域で周波数レベルが下がることに着目し、広帯域で監視し、受信アンテナが健全な時に予め計測したデータ（閾値）と比較するようにした。具体的には、電気機器の部分放電により発生する電磁波を受信するための受信アンテナと、前記受信アンテナが受信した電磁波に基づいて、前記電気機器に部分放電が発生しているか否かを判定する判定装置とを備えた電気機器絶縁診断装置において、前記判定装置は、前記受信アンテナが受信した広帯域の周波数成分の総和が、受信アンテナが健全な時に計測して算出した閾値と比較して、基準レベル以下となったとき、前記電気機器絶縁診断装置の受信アンテナに異常があることを判定する手段とを備えたことを特徴とする。   In order to achieve the above-mentioned object, the electrical equipment insulation diagnosis apparatus of the present invention of the present invention pays attention to the fact that the frequency level decreases in a wide band when the antenna cable is disconnected, and monitors in advance and measures in advance when the receiving antenna is healthy. The data (threshold value) was compared. Specifically, based on the reception antenna for receiving electromagnetic waves generated by partial discharge of the electric device and the electromagnetic waves received by the reception antenna, it is determined whether or not partial discharge is generated in the electric device. In the electrical equipment insulation diagnostic device including the determination device, the determination device is configured to compare a sum of wideband frequency components received by the reception antenna with a threshold value measured and calculated when the reception antenna is healthy. And a means for determining that there is an abnormality in the receiving antenna of the electrical equipment insulation diagnostic device when the level is below the level.

従来のアンテナ健全性の異常検出は、テレビ放送波を用いてある特定の周波数を監視しているが、本発明は、広帯域で周波数の減少を監視しているので、使用地域の変更毎にあらたな設定変更を行う必要がない。また、広帯域での監視により周囲の周波数状況が変わった場合においても精度良く監視が可能である。どの地域においても、簡単でシンプルな構成でアンテナ健全性の異常検出が可能であり、可搬形、常設形の両装置への適応が可能である。   Conventional antenna health abnormality detection uses a television broadcast wave to monitor a specific frequency. However, since the present invention monitors a decrease in frequency over a wide band, it appears every time the area of use is changed. There is no need to change any settings. In addition, even when the surrounding frequency changes due to monitoring in a wide band, it is possible to monitor with high accuracy. In any region, it is possible to detect anomalies in antenna health with a simple and simple configuration, and it can be applied to both portable and permanent devices.

本発明の絶縁診断装置のハードウェア構成Hardware configuration of insulation diagnosis apparatus of the present invention 図１の絶縁診断装置の動作を説明するフローチャートThe flowchart explaining operation | movement of the insulation diagnostic apparatus of FIG. ａ）正常時及び、ｂ）異常時の周波数成分データa) Normal and b) Abnormal frequency component data アンテナ健全性異常検出例Example of antenna health abnormality detection

アンテナ健全性の正常時と断線時の周波数を比較するとアンテナ健全性が、異常の時は、広範囲にわたり周波数レベルが減少する為、周波数レベルの減少を検知することで、アンテナの異常を検出することが可能である。正常時及び異常時の周波数成分データ例を図３に示す。(例として診断帯域は３０ＭＨｚから３３０ＭＨｚとした)。周波数の帯域については、ＨＦ帯、ＶＨＦ帯、ＵＨＦ帯のどの帯域でもよく、任意の周波数帯域で実施することができる。   When the antenna health is normal and when the disconnection frequency is compared, when the antenna health is abnormal, the frequency level decreases over a wide range, so detecting the antenna level abnormality is detected. Is possible. An example of frequency component data at normal time and abnormal time is shown in FIG. (As an example, the diagnostic bandwidth was 30 MHz to 330 MHz). The frequency band may be any band of the HF band, the VHF band, and the UHF band, and can be implemented in an arbitrary frequency band.

図１のハードウェア構成と、図２のフローチャートを用いて本発明について説明する。判定装置３の構成は、受信機４、Ａ／Ｄ５、ＣＰＵ６、メモリ７、出力装置８から構成されている。アンテナセンサ１からデータを取得しケーブル２を介して受信機４にデータを取り込む。受信機４は、スペクトルアナライザとして、周波数分析データをＡ／Ｄ５へ入力し、ＣＰＵ６では断線検出のみを行ってもいいし、受信機４から電圧データをＡ／Ｄ５へ入力し、ＣＰＵ６にてＦＦＴ（Fast Fourier Transform）を行って周波数成分データの計測と断線検出の両方を行なうこともできる。メモリ７は、閾値データと健全性判定基準値を保持している。アンテナの異常を検出した時は、出力装置７に異常を出力するように構成されている   The present invention will be described with reference to the hardware configuration of FIG. 1 and the flowchart of FIG. The determination device 3 includes a receiver 4, an A / D 5, a CPU 6, a memory 7, and an output device 8. Data is acquired from the antenna sensor 1 and the data is taken into the receiver 4 via the cable 2. As a spectrum analyzer, the receiver 4 may input frequency analysis data to the A / D 5 and the CPU 6 may perform only disconnection detection. Alternatively, the receiver 4 may input voltage data to the A / D 5 and the CPU 6 may perform FFT. (Fast Fourier Transform) can be performed to perform both frequency component data measurement and disconnection detection. The memory 7 holds threshold data and soundness determination reference values. It is configured to output an abnormality to the output device 7 when an abnormality of the antenna is detected.

実際の動きを、図２のフローチャートを用いて説明する。まず、ステップＳ１でアンテナセンサ１からデータを取得する。ＣＰＵ６にてＦＦＴを行なう場合には、データ取得のサンプリング周波数（ｆsmp）はサンプリング定理より断線検出周波数帯域の最大値の２倍以上とし、データ取得後、ＦＦＴを行なう。（例えばＶＨＦ帯の３０Ｍｈｚ〜３３０Ｍｈｚの帯域の時のサンプリング周波数（ｆsmp）は６６０MHz以上とする。   The actual movement will be described with reference to the flowchart of FIG. First, data is acquired from the antenna sensor 1 in step S1. In the case where the FFT is performed by the CPU 6, the sampling frequency (fsmp) for data acquisition is set to at least twice the maximum value of the disconnection detection frequency band according to the sampling theorem, and the FFT is performed after data acquisition. (For example, the sampling frequency (fsmp) at the time of 30 MHz to 330 MHz in the VHF band is set to 660 MHz or more.

次に、ステップＳ２でモードの確認を行う。本発明では、閾値の算出を行う閾値算出モードと、実際に異常の検出を行う異常検出モードの２つのモードを設けている。初期モードは、閾値算出モードに設定されている。初めの数回（１回でもよい）は閾値算出モードとなり、ステップＳ３の閾値算出処理を行う。閾値算出は周波数成分のデータを積算するため次式で行う。
ＴＨ＝Ｆ１＋Ｆ２＋Ｆ３＋・・＋Ｆn
このときは、Ｆnはn 番目の周波数成分値、ＴＨは最終閾値とする。算出を1回以上のデータを用いて行なう場合は、全閾値の平均としてもよいし、一度全閾値データをソートし、N番目のデータを閾値としてもよい。 Next, the mode is confirmed in step S2. In the present invention, two modes are provided: a threshold value calculation mode for calculating a threshold value and an abnormality detection mode for actually detecting an abnormality. The initial mode is set to the threshold calculation mode. The first several times (or once) is the threshold value calculation mode, and the threshold value calculation process in step S3 is performed. The threshold value is calculated by the following equation in order to integrate frequency component data.
TH = F 1 + F 2 + F 3 + .. + F n
In this case, F n is the nth frequency component value, and TH is the final threshold value. When the calculation is performed using one or more data, the average of all threshold values may be used, or all threshold data may be sorted once and the Nth data may be used as the threshold value.

例えば帯域を３０ＭＨｚから３３０ＭＨｚ未満とし、３ＭＨｚごとに１００個のデータがあるとすると、Ｆ１は、３０ＭＨｚの周波数成分、Ｆ２は、３３ＭＨｚの周波数成分、Ｆ１００は、３２７ＭＨｚの周波数成分となる。このＦ１からＦ１００までのデータを積算する。

Figure 2012193975
ＴＨ＝０．５+０+０+２．３+・・・+１．１＋２．２＋１．２＋１．４＝１８９．８ For example, if the band is 30 MHz to less than 330 MHz and there are 100 data every 3 MHz, F 1 is a frequency component of 30 MHz, F 2 is a frequency component of 33 MHz, and F 100 is a frequency component of 327 MHz. From the F 1 integrates the data of up to F 100.
Figure 2012193975
 TH = 0.5 + 0 + 0 + 2.3 +... + 1.1 + 2.2 + 1.2 + 1.4 = 189.8

閾値算出処理を１回で行う場合は、ステップＳ４のモード変更確認で、モード変更ありとなる。ステップＳ５でモードを異常検出モードに変更した後、ステップＳ６の最終閾値算出の値を、前記１８９．８とし、ステップＳ１０次のデータ取得待状態となる。次回のデータ取得から、異常検出モード側のフローチャートが実行される。閾値算出処理を1回以上のデータを用いて行う場合は、ステップＳ４のモード変更確認で、モード変更無しとなり、ステップＳ１０次のデータ取得待状態となる。   When the threshold value calculation process is performed once, the mode change is confirmed in the mode change confirmation in step S4. After the mode is changed to the abnormality detection mode in step S5, the final threshold calculation value in step S6 is set to 189.8, and the next data acquisition waiting state in step S10 is entered. From the next data acquisition, the flowchart on the abnormality detection mode side is executed. When the threshold calculation process is performed using data one or more times, the mode change confirmation in step S4 indicates no mode change, and the next data acquisition waiting state is entered in step S10.

閾値算出処理を、何回か行う場合は、全閾値（ＴＨ）の平均としてもよいし、全閾値データをソートして、真ん中データを閾値としてもよい。最終閾値をＴＨ＿Ｆとする。閾値算出に３回のデータを使用した場合は、１回目のＴＨ＿Ｆ：１８９．８， ２回目のＴＨ＿Ｆ：１８５．５， ３回目のＴＨ＿Ｆ：１８７．６であった場合は、
ＴＨ＿Ｆ＝（１８９．８＋１８５．５＋１８７．６）／３＝１８７．６となる。 When the threshold calculation process is performed several times, the average of all threshold values (TH) may be used, or all threshold data may be sorted and the middle data may be used as the threshold value. Let the final threshold be TH_F. When three times of data are used for the threshold calculation, the first TH_F: 189.8, the second TH_F: 185.5, the third TH_F: 187.6,
TH_F = (189.8 + 185.5 + 187.6) /3=187.6.

このようにして、まず閾値算出モードで閾値を決定したら、次からは、異常検出モードになり、ステップＳ７のアンテナの健全性の異常検出処理が実行される。前記閾値ＴＨ＿Ｆと、今回データ取得した周波数成分の積算データ（ＤＡＴＡ）とを比較して、予め設定した判定値（P）以下になったら、アンテナ健全性判定がＮＧとなり、ステップＳ１１のアンテナ異常出力の実行となり、アンテナ異常を出力装置７へ出力する。
Ｐ＞（ＤＡＴＡ／ＴＨ＿Ｆ）×１００
周波数成分の積算は、Ａ／Ｄ変換器５でディジタルデータに変換して、ＣＰＵ６へ取り込みＦＦＴ演算を行い取得する。あるいは、スペクトラムアナライザにより取得することも可能である。 In this way, after the threshold value is first determined in the threshold value calculation mode, the abnormality detection mode is set next, and the abnormality detection process for the antenna health in step S7 is executed. The threshold TH_F is compared with the integrated data (DATA) of the frequency component acquired this time, and when it is equal to or less than a predetermined determination value (P), the antenna soundness determination is NG, and the antenna abnormality output in step S11 The antenna abnormality is output to the output device 7.
P> (DATA / TH_F) × 100
The integration of the frequency components is converted into digital data by the A / D converter 5 and taken into the CPU 6 and obtained by performing the FFT operation. Alternatively, it can be acquired by a spectrum analyzer.

ステップＳ８の健全性判定は、アンテナ健全性の異常検出処理で、1回の検出で異常出力してもよいが、数回連続して、異常を検出したときに出力するようにすれば、誤検出を少なくできる。アンテナ健全性が、正常な場合には、ステップＳ９の絶縁診断を実行する。アンテナ健全性が異常な場合は、ステップS１１のアンテナ異常出力を出力装置８に出力し、健全なアンテナに交換するなどの、作業を行った後、本処理ルーチンを再度実行すればよい。   The soundness determination in step S8 may be an abnormality output in one detection in the antenna soundness abnormality detection process. However, if the abnormality is detected several times in succession, an error may occur. Detection can be reduced. If the antenna soundness is normal, the insulation diagnosis in step S9 is executed. If the antenna soundness is abnormal, the processing routine may be executed again after performing an operation such as outputting the antenna abnormal output in step S11 to the output device 8 and replacing it with a sound antenna.

前記例では、絶縁診断を行うごとにアンテナ健全性をチェックする構成としたが、絶縁診断については常時行い、アンテナの健全性の異常検出は、ある決まった任意の時間に実行してもよい。   In the above example, the antenna soundness is checked every time the insulation diagnosis is performed. However, the insulation diagnosis may be performed at all times, and the abnormality detection of the antenna soundness may be executed at a predetermined arbitrary time.

実際の絶縁診断装置で本発明を用いてアンテナ健全性異常を検出したときの例を図４に示す。この試験結果を基に判定値を５０％と設定しています。例えば、３０ＭＨｚ〜３３０ＭＨｚの範囲でデータを取得して、判定値Ｐを５０％とした場合、正常時の閾値１８９．８で、異常時の取得データの総和が５７．７となっている場合。
Ｐ（５０％）＞（５７．７／１８９．８）×１００＝３０．４ となり、異常時のデータは正常時のデータの約３０％まで減少しており、２０％の余裕を持ってアンテナの断線を判定できている。実施例では、判定値Pを５０としたが、判定値Pは、可変できるようになっており、現地で調整しながら最適値を決めることもできる。標準的には、５０前後に設定すれば、感度よく検出が可能である。 FIG. 4 shows an example when an abnormality in antenna soundness is detected using the present invention with an actual insulation diagnostic apparatus. Based on this test result, the judgment value is set to 50%. For example, when data is acquired in the range of 30 MHz to 330 MHz and the determination value P is 50%, the sum of the acquired data at the time of abnormality is 57.7 with the threshold value 189.8 at the normal time.
P (50%)> (57.7 / 189.8) × 100 = 30.4 The data at the time of abnormality is reduced to about 30% of the data at the time of normality, and the antenna has a margin of 20%. Can be determined. In the embodiment, the determination value P is set to 50. However, the determination value P can be varied, and an optimum value can be determined while adjusting on site. As a standard, if it is set to around 50, detection is possible with high sensitivity.

この発明は、たとえば、ガス絶縁開閉器などの絶縁診断装置において、受信アンテナが正常に受信でき、絶縁診断を行える状態かどうかの判定機能を含んだ、絶縁診断装置に適応できる。   The present invention can be applied to an insulation diagnosis apparatus including a determination function as to whether or not an insulation diagnosis apparatus such as a gas insulation switch can receive signals normally and perform insulation diagnosis.

１ アンテナセンサ
２ ケーブル
３ 判定装置
４ 受信機
５ Ａ／Ｄ変換器
６ ＣＰＵ
７ メモリ
８ 出力装置 DESCRIPTION OF SYMBOLS 1 Antenna sensor 2 Cable 3 Judgment apparatus 4 Receiver 5 A / D converter 6 CPU
7 Memory 8 Output device

Claims (1)

電気機器の部分放電により発生する電磁波を受信するための受信アンテナと、前記受信アンテナが受信した電磁波に基づいて、前記電気機器に部分放電が発生しているか否かを判定する判定装置とを備えた電気機器絶縁診断装置において、前記判定装置は、前記受信アンテナが受信した広帯域の周波数成分の総和が、受信アンテナが健全な時に計測して算出した閾値と比較して、判定レベル以下となったとき、前記電気機器絶縁診断装置の受信アンテナに異常があることを判定する判定手段を備えたことを特徴とする電気機器絶縁診断装置。 A receiving antenna for receiving an electromagnetic wave generated by partial discharge of the electric device; and a determination device for determining whether or not the partial discharge is generated in the electric device based on the electromagnetic wave received by the receiving antenna. In the electrical equipment insulation diagnostic device, the determination device has a sum of broadband frequency components received by the receiving antenna that is lower than a determination level compared to a threshold value measured and calculated when the receiving antenna is healthy. An electrical equipment insulation diagnostic apparatus comprising: a determination means for judging that there is an abnormality in the receiving antenna of the electrical equipment insulation diagnostic apparatus.
JP2011056328A 2011-03-15 2011-03-15 Electric apparatus insulation diagnostic device Withdrawn JP2012193975A (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN103941209A (en) * 2014-04-13 2014-07-23 北京工业大学 Checking method based on vibration positioning GIS partial discharge equipment
CN104849602A (en) * 2015-06-05 2015-08-19 广东电网有限责任公司佛山供电局 GIS double-bus distribution equipment fault detection method and system
CN105044430A (en) * 2015-06-05 2015-11-11 广东电网有限责任公司佛山供电局 Branch current detection method and system of double-bus distribution equipment parallel outlet wires
JP2016003978A (en) * 2014-06-18 2016-01-12 日新電機株式会社 Partial discharge detection device and failure self-diagnosis method for partial discharge detection device
JP2017161314A (en) * 2016-03-08 2017-09-14 オムロン株式会社 Failure detection device and failure detection method of dc power source

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941209A (en) * 2014-04-13 2014-07-23 北京工业大学 Checking method based on vibration positioning GIS partial discharge equipment
JP2016003978A (en) * 2014-06-18 2016-01-12 日新電機株式会社 Partial discharge detection device and failure self-diagnosis method for partial discharge detection device
CN104849602A (en) * 2015-06-05 2015-08-19 广东电网有限责任公司佛山供电局 GIS double-bus distribution equipment fault detection method and system
CN105044430A (en) * 2015-06-05 2015-11-11 广东电网有限责任公司佛山供电局 Branch current detection method and system of double-bus distribution equipment parallel outlet wires
CN104849602B (en) * 2015-06-05 2017-12-22 广东电网有限责任公司佛山供电局 GIS double-bus distribution equipment fault detection methods and system
JP2017161314A (en) * 2016-03-08 2017-09-14 オムロン株式会社 Failure detection device and failure detection method of dc power source

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