JP2670948B2 - Partial discharge monitoring method - Google Patents
Partial discharge monitoring methodInfo
- Publication number
- JP2670948B2 JP2670948B2 JP28355692A JP28355692A JP2670948B2 JP 2670948 B2 JP2670948 B2 JP 2670948B2 JP 28355692 A JP28355692 A JP 28355692A JP 28355692 A JP28355692 A JP 28355692A JP 2670948 B2 JP2670948 B2 JP 2670948B2
- Authority
- JP
- Japan
- Prior art keywords
- partial discharge
- ground
- monitoring method
- transformer
- current detector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Relating To Insulation (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、発電機や変圧器、遮断
器などの高電圧機器に生じる部分放電を活線で監視する
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for live monitoring of partial discharges occurring in high voltage equipment such as generators, transformers and circuit breakers.
【0002】[0002]
【従来の技術】部分放電を活線で監視する場合、従来で
は原則としてそれぞれの機器に各種のセンサを設けて、
各センサの出力信号に対してそれぞれ判定部を設け、異
なる処理を行っていた。例えば、油入変圧器では油中に
溶存する分解ガスを検出するセンサにより部分放電の有
無を間接的に監視し、またガス絶縁開閉装置では装置内
部に埋込んだ電極の電位変動を検出するセンサなどが用
いられてきた。最近では複数の機器を単一のセンサで監
視する方法として、電磁界を検出するアンテナを用い
て、部分放電の発生に伴って放射される電磁波を検出す
る方法も用いられている。2. Description of the Related Art Conventionally, in the case of monitoring a partial discharge on a hot line, conventionally, each device is provided with various sensors,
A determination unit is provided for each output signal of each sensor to perform different processing. For example, in oil-filled transformers, sensors that detect decomposed gas dissolved in oil indirectly monitor the presence of partial discharge, and in gas-insulated switchgear, sensors that detect potential fluctuations in electrodes embedded inside the equipment. Have been used. Recently, as a method of monitoring a plurality of devices with a single sensor, a method of using an antenna for detecting an electromagnetic field to detect an electromagnetic wave emitted with the occurrence of partial discharge is also used.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、それぞ
れの機器にセンサを設ける方法は、複数の種類のセンサ
が数多く必要であり、また判定部も複数必要であり、さ
らに設置に要する手間も繁雑である。アンテナを用いる
方法は、電磁波の距離減衰を考慮した場合に監視範囲の
制約を受け、また高電圧機器の付近に細長い金属物を設
置する場合には電気的事故の危険性を伴うなどの難点が
ある。However, the method of providing a sensor on each device requires a large number of sensors of a plurality of types, a plurality of determination sections, and the labor required for installation is complicated. . The method using an antenna is subject to restrictions such as restriction of the monitoring range when considering the attenuation of electromagnetic waves, and the risk of electrical accidents when installing a slender metal object near high-voltage equipment. is there.
【0004】[0004]
【課題を解決するための手段】本発明は、発変電所や開
閉所に設置されている複数の高電圧機器の部分放電監視
を、一つの検出手段により簡易にかつ安全に行えるよう
にしたものである。本発明では、発変電所や開閉所に設
置されているコンデンサ形計器用変圧器の接地線に、こ
れに流れる部分放電電流を検出する電流検出器を設け、
この電流検出器の出力信号を判定部にとり込み基準値と
比較することにより、上記計器用変圧器と電気的に接続
された機器に生じる部分放電を監視する。SUMMARY OF THE INVENTION According to the present invention, a single detecting means can easily and safely perform partial discharge monitoring of a plurality of high-voltage equipment installed in a power substation or a switchyard. Is. In the present invention, the ground wire of the transformer for the capacitor type instrument installed in the power substation or switching station, the current detector for detecting the partial discharge current flowing through it is provided,
By taking the output signal of the current detector into the determination unit and comparing it with a reference value, the partial discharge occurring in the device electrically connected to the instrument transformer is monitored.
【0005】[0005]
【作用】上記本発明の部分放電監視方法によれば、計器
用変圧器と電気的に接続されたいずれの機器で部分放電
電流が発生してもこれを検出することができる。以下
に、この作用について説明する。経年使用や過酷な条件
での使用により、機器の電気絶縁性能が低下すると、部
分放電が発生して、当該機器の充電部から接地線を経由
して大地にパルス性の部分放電電流が流れる。この部分
放電電流は、他の健全な機器の接地線と対地静電容量を
経由して大地から充電部へ戻り閉回路を形成するが、部
分放電電流の分流比は各機器の対地静電容量に比例す
る。したがって、対地静電容量の大きなコンデンサ形計
器用変圧器の接地線には部分放電電流が比較的多く流れ
るため、これを検出する電流検出器を設けて、電流検出
器の出力信号を判定部にとり込み基準値と比較すること
により、上記計器用変圧器と電気的に接続された他の機
器の部分放電を監視することができる。According to the partial discharge monitoring method of the present invention, it is possible to detect the partial discharge current generated in any device electrically connected to the instrument transformer. Hereinafter, this operation will be described. When the electrical insulation performance of the device deteriorates due to long-term use or use under severe conditions, partial discharge occurs, and a pulsed partial discharge current flows from the charging part of the device to the ground via the ground wire. This partial discharge current returns from the ground to the charging part via the ground wire of another healthy device and the capacitance to ground to form a closed circuit.The shunt ratio of the partial discharge current depends on the capacitance to ground of each device. Proportional to. Therefore, since a relatively large amount of partial discharge current flows in the ground wire of a capacitor type instrument transformer with a large electrostatic capacitance to ground, a current detector is provided to detect this and the output signal of the current detector is sent to the judgment section. The partial discharge of the other device electrically connected to the meter transformer can be monitored by comparing the partial discharge with the standard value.
【0006】[0006]
【実施例】図1は、本発明の部分放電監視方法を変電所
に用いた一実施例である。コンデンサ形計器用変圧器1
は、分圧コンデンサ4a及び4bによって、母線と呼ば
れる充電部2と大地3の間の電位差を分圧して測定する
機器であり、本発明では計器用変圧器1の接地線5に部
分放電電流を検出する電流検出器6を設ける。電流検出
器6には、パルス性の部分放電電流を高感度で検出でき
る高周波用の貫通形変流器を用いるのが好ましいが、他
に抵抗やインダクタンス、静電容量を組合せて構成する
検出インピーダンスも考えられる。いずれの場合も、電
気検出器6の出力信号を判定部7にとり込む。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment in which the partial discharge monitoring method of the present invention is used in a substation. Capacitor type voltage transformer 1
Is a device that divides and measures the potential difference between the charging unit 2 and the ground 3, which is called a bus, by the voltage dividing capacitors 4a and 4b. In the present invention, a partial discharge current is applied to the ground wire 5 of the instrument transformer 1. A current detector 6 for detecting is provided. As the current detector 6, it is preferable to use a high-frequency through-type current transformer capable of detecting a pulsed partial discharge current with high sensitivity, but it is also possible to use a detection impedance formed by combining resistance, inductance, and capacitance. Can also be considered. In either case, the output signal of the electric detector 6 is taken into the determination unit 7.
【0007】次に、上記のような構成において、コンデ
ンサ形計器用変圧器1と電気的に接続されている他の機
器を監視する方法について説明する。図2は、図1の変
電所構成に対しての高周波等価回路であり、各機器は対
地静電容量として扱うことができる。図2で、電気絶縁
性能の低下した機器8に部分放電が発生すると、部分放
電電流IDが機器8の充電部2から大地3に流れる。こ
の部分放電電流IDは、計器用変圧器1や他の健全な機
器の接地線と対地静電容量を経由して大地3から充電部
2へ戻る。この時計器用変圧器1の接地線5を流れる部
分放電電流の分流成分IPは、計器用変圧器1の対地静
電容量をCP、その他の健全な機器の対地静電容量の総
和をCXとした場合、 IP=ID・CP/(CP+CX) で示される。実用に供されている高電圧機器では、計器
用変圧器1の対地静電容量CPは遮断器等の他の機器の
対地静電容量よりも大きく、IDとIPの値はオーダ的
には一致する。Next, a method of monitoring another device electrically connected to the capacitor type instrument transformer 1 in the above-mentioned configuration will be described. FIG. 2 is a high frequency equivalent circuit for the substation configuration of FIG. 1, and each device can be treated as a capacitance to ground. In FIG. 2, when a partial discharge occurs in the device 8 whose electrical insulation performance has deteriorated, a partial discharge current ID flows from the charging section 2 of the device 8 to the ground 3. The partial discharge current ID returns from the ground 3 to the charging unit 2 via the grounding wire of the instrument transformer 1 and other sound equipment and the ground capacitance. For the shunt component IP of the partial discharge current flowing through the ground wire 5 of the timepiece transformer 1, the ground capacitance of the voltage transformer 1 is CP, and the sum of the ground capacitances of other sound devices is CX. In this case, IP = ID · CP / (CP + CX) In high-voltage equipment that is put to practical use, the ground capacitance CP of the instrument transformer 1 is larger than the ground capacitance of other equipment such as a circuit breaker, and the ID and IP values match in order. To do.
【0008】上記の作用は、充電部2により計器用変圧
器1と電気的に接続されている他の機器についてもあて
はまる。したがって、いずれの機器で部分放電が発生し
ても、接地線5に部分放電電流の分流成分IPが流れ
る。また形計器用変圧器1自体に部分放電が発生した場
合には、部分放電電流の全てが接地線5に流れる。The above-described operation is also applicable to other devices electrically connected to the instrument transformer 1 by the charging section 2. Therefore, even if a partial discharge occurs in any of the devices, the shunt component IP of the partial discharge current flows in the ground line 5. Further, when partial discharge occurs in the transformer 1 for measuring instrument itself, all of the partial discharge current flows to the ground line 5.
【0009】電流検出器6では、接地線5に流れる上記
分流成分IPを検出し、その出力信号を判定部7にとり
込み、あらかじめ設定しておいた基準値と比較すること
により部分放電を監視できる。したがって、電気絶縁性
能の低下した機器8に直接センサを設けることなく、計
器用変圧器1の接地線5に電流検出器6を設けることで
部分放電監視できる。The current detector 6 detects the shunting component IP flowing through the ground line 5, takes in the output signal of the shunting component IP, and compares it with a preset reference value to monitor the partial discharge. . Therefore, the partial discharge can be monitored by providing the current detector 6 on the ground wire 5 of the instrument transformer 1 without directly providing the sensor on the device 8 whose electrical insulation performance is deteriorated.
【0010】[0010]
【発明の効果】以上述べたように、本発明はコンデンサ
形計器用変圧器の接地線に電流検出器を設けて、その出
力信号を判定部にとり込み基準値と比較することにより
部分放電を監視するので、一つの検出手段により上記計
器用変圧器と電気的に接続されている全ての機器を監視
することができ、センサや判定部の構成が簡易となり、
設置の手間もかからない。また、アンテナを用いる方法
と比較した場合、部分放電電流の大きさは機器の対置静
電容量により決まるので距離減衰を考慮する必要が無
く、接地線に電流検出器を設けるので高電圧機器の付近
に細長い金属物を設置する場合の危険性も回避できる。As described above, according to the present invention, the current detector is provided in the ground wire of the transformer for capacitor type instrument, and the output signal thereof is taken into the judging section and compared with the reference value to monitor the partial discharge. Therefore, it is possible to monitor all the devices electrically connected to the above-mentioned instrument transformer by one detection means, and the configuration of the sensor and the determination unit becomes simple,
It does not take time to install. Compared with the method using an antenna, the magnitude of the partial discharge current is determined by the capacitance of the equipment in pairs, so it is not necessary to consider the distance attenuation. It is possible to avoid the danger of installing a long and slender metal object.
【図1】本発明による部分放電監視方法の一実施例を示
す図である。FIG. 1 is a diagram showing an embodiment of a partial discharge monitoring method according to the present invention.
【図2】本発明による部分放電監視方法の作用を説明す
る高周波等価回路図である。FIG. 2 is a high frequency equivalent circuit diagram for explaining the operation of the partial discharge monitoring method according to the present invention.
1 コンデンサ形計器用変圧器 2 充電部 3 大地 4a 分圧コンデンサ 4b 分圧コンデンサ 5 接地線 6 電流検出器 7 判定部 8 電気絶縁性能の低下した機器 1 Capacitor type transformer 2 Charging part 3 Earth 4a Voltage dividing capacitor 4b Voltage dividing capacitor 5 Ground wire 6 Current detector 7 Judgment part 8 Equipment with reduced electrical insulation performance
───────────────────────────────────────────────────── フロントページの続き (72)発明者 本多 眞治 愛知県西春日井郡西枇杷島町芳野町3丁 目1番地 株式会社高岳製作所 名古屋 事業所 開発部内 審査官 江頭 信彦 (56)参考文献 実開 平5−67114(JP,U) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Honda 3-chome, Yoshino-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Takadake Manufacturing Co., Ltd. Nagoya Office Development Department Examiner Nobuhiko Egashira (56) References 5-67114 (JP, U)
Claims (1)
デンサ形計器用変圧器の接地線に、これに流れる部分放
電電流を検出する電流検出器を設け、 この電流検出器の出力信号を判定部にとり込み基準値と
比較することにより、上記計器用変圧器と電気的に接続
された複数の高電圧機器に生じる部分放電を監視する、
部分放電監視方法。1. A current detector for detecting a partial discharge current flowing through the ground wire of a capacitor type instrument transformer installed in a power substation or a switchyard, and an output signal of the current detector is provided. By comparing with the reference value taken into the determination unit, to monitor the partial discharge that occurs in a plurality of high-voltage equipment electrically connected to the instrument transformer,
Partial discharge monitoring method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28355692A JP2670948B2 (en) | 1992-09-30 | 1992-09-30 | Partial discharge monitoring method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28355692A JP2670948B2 (en) | 1992-09-30 | 1992-09-30 | Partial discharge monitoring method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06109800A JPH06109800A (en) | 1994-04-22 |
JP2670948B2 true JP2670948B2 (en) | 1997-10-29 |
Family
ID=17667060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP28355692A Expired - Fee Related JP2670948B2 (en) | 1992-09-30 | 1992-09-30 | Partial discharge monitoring method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2670948B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6331521B2 (en) * | 2014-03-14 | 2018-05-30 | 日新電機株式会社 | Partial discharge monitoring device and partial discharge monitoring system |
WO2020174522A1 (en) * | 2019-02-25 | 2020-09-03 | 日新電機株式会社 | Intermediate electrode structure, transformer using same, and partial discharge detector |
JP7276009B2 (en) * | 2019-08-29 | 2023-05-18 | 富士電機株式会社 | DISCHARGE DETECTION DEVICE AND DISCHARGE DETECTION METHOD |
-
1992
- 1992-09-30 JP JP28355692A patent/JP2670948B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH06109800A (en) | 1994-04-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |