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JP2009258011A - Partial discharge measuring method - Google Patents

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JP2009258011A
JP2009258011A JP2008109224A JP2008109224A JP2009258011A JP 2009258011 A JP2009258011 A JP 2009258011A JP 2008109224 A JP2008109224 A JP 2008109224A JP 2008109224 A JP2008109224 A JP 2008109224A JP 2009258011 A JP2009258011 A JP 2009258011A
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partial discharge
measurement
bypass line
closed circuit
capacitor
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JP4949314B2 (en
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Hiroyuki Yanagawa
裕之 柳川
Moritake Azuma
盛剛 東
Koji Urano
幸治 浦野
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Se Technology Ltd
J Power Systems Corp
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Se Technology Ltd
J Power Systems Corp
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Priority to SG200901794-8A priority patent/SG156567A1/en
Priority to TW98108978A priority patent/TWI409473B/en
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Abstract

【課題】部分放電信号の検出感度に優れる部分放電測定方法を提供する。
【解決手段】絶縁筒１４を介して接続された金属シース１３Ａ及び１３Ｂとの間にコンデンサ２０を有する低インピーダンスのバイパス線２１を設け、このバイパス線２１に流れる部分放電電流を高周波変流器３０で検出するようにしたので、部分放電信号を商用周波数から容易に分離できるとともに、部分放電信号に空気伝搬した外来ノイズが重畳しにくいことから、検出感度を向上させることができる。
【選択図】図１A partial discharge measuring method having excellent detection sensitivity of a partial discharge signal is provided.
A low impedance bypass line 21 having a capacitor 20 is provided between metal sheaths 13A and 13B connected via an insulating cylinder 14, and a partial discharge current flowing through the bypass line 21 is converted into a high-frequency current transformer 30. Thus, the partial discharge signal can be easily separated from the commercial frequency, and the external noise propagated in the air is difficult to be superimposed on the partial discharge signal, so that the detection sensitivity can be improved.
[Selection] Figure 1

Description

本発明は、部分放電測定方法に関する。   The present invention relates to a partial discharge measurement method.

従来、高電圧電力設備に生じる部分放電を測定する部分放電測定方法として、例えば、電力ケーブルの表面に箔電極を設け、この箔電極を介して電力ケーブルの外部に取り出した部分放電パルスを検出インピーダンスを用いて測定するものがある（例えば、特許文献１参照）。
特開平７−１７４８０９号公報 Conventionally, as a partial discharge measuring method for measuring a partial discharge generated in a high voltage power facility, for example, a foil electrode is provided on the surface of a power cable, and a partial discharge pulse taken out of the power cable through this foil electrode is detected impedance. (For example, refer to Patent Document 1).
JP 7-174809 A

しかし、従来の部分放電測定方法によると、部分放電を検出するにあたって高インピーダンスの検出器を用いているため、空気伝搬した外来ノイズが部分放電信号に重畳しやすく、そのことによって部分放電信号の検出感度を低下させるという問題がある。   However, according to the conventional partial discharge measurement method, a high-impedance detector is used to detect the partial discharge, so that the external noise propagated in the air is easily superimposed on the partial discharge signal, thereby detecting the partial discharge signal. There is a problem of lowering the sensitivity.

従って、本発明の目的は、部分放電信号の検出感度に優れる部分放電測定方法を提供することにある。   Accordingly, it is an object of the present invention to provide a partial discharge measuring method that is excellent in detection sensitivity of partial discharge signals.

本発明は、上記目的を達成するため、商用周波数におけるインピーダンスに対して部分放電の周波数帯域におけるインピーダンスが小となるコンデンサを有した測定用閉回路を測定対象の外部に設け、前記測定用閉回路を流れる部分放電電流を高周波変流器で検出することを特徴とする部分放電測定方法を提供する。   In order to achieve the above object, the present invention provides a measurement closed circuit having a capacitor whose impedance in the frequency band of partial discharge is smaller than the impedance at the commercial frequency outside the measurement object, and the measurement closed circuit A partial discharge measuring method is provided, in which a partial discharge current flowing through is detected with a high-frequency current transformer.

上記部分放電測定方法において、測定対象の外周に設置した絶縁筒で分割されたシース間を、コンデンサを介して接続して部分放電に基づく電流を通過させる測定用閉回路を形成しても良い。また、コンデンサを箔電極と測定対象を構成する絶縁物の一部を用いて形成することもできる。さらに、測定用閉回路を測定対象と接地との間に設けても良い。また、測定用閉回路を測定対象と設備ケースとの間に設けても良い。また、複数の測定対象をコンデンサを介して接続して測定用閉回路を形成するものであっても良い。   In the partial discharge measuring method, a closed circuit for measurement may be formed in which sheaths divided by an insulating cylinder installed on the outer periphery of the measurement target are connected via a capacitor to pass a current based on the partial discharge. Moreover, a capacitor can also be formed using a part of insulator which comprises a foil electrode and a measuring object. Furthermore, a closed circuit for measurement may be provided between the measurement object and the ground. A closed circuit for measurement may be provided between the measurement object and the equipment case. Further, a closed circuit for measurement may be formed by connecting a plurality of measurement objects via a capacitor.

本発明の部分放電測定方法によれば、部分放電信号の検出感度を向上させることができる。   According to the partial discharge measuring method of the present invention, it is possible to improve the detection sensitivity of the partial discharge signal.

［第１の実施の形態］
図１は、本発明の第１の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。 [First Embodiment]
FIG. 1 is a diagram showing a configuration used for performing partial discharge measurement according to the first embodiment of the present invention.

第１の実施の形態は、測定対象である電力ケーブル１０の外部にコンデンサ２０を有するバイパス線２１を接続し、バイパス線２１を流れる部分放電電流を高周波変流器３０を介して部分放電信号を検出するものである。   In the first embodiment, a bypass line 21 having a capacitor 20 is connected to the outside of a power cable 10 to be measured, and a partial discharge current flowing through the bypass line 21 is converted into a partial discharge signal via a high-frequency current transformer 30. It is to detect.

電力ケーブル１０は、導体１１と、絶縁体１２と、絶縁体１２の外周に設けられる金属シース１３Ａ，１３Ｂと、金属シース１３Ａ，１３Ｂとを有し、金属シース１３Ａ，１３Ｂの一部の外周にはそれらを絶縁する絶縁筒１４が設けられる。   The power cable 10 includes a conductor 11, an insulator 12, metal sheaths 13A and 13B provided on the outer periphery of the insulator 12, and metal sheaths 13A and 13B, and a part of the outer periphery of the metal sheaths 13A and 13B. Is provided with an insulating cylinder 14 for insulating them.

また、電力ケーブル１０から部分放電信号を検出するものとして、バイパス線２１に着脱可能に設けられる高周波変流器３０と、高周波変流器３０にリード線４０を介して接続される電光変換部（Ｅ/Ｏ）５０と、電光変換部（Ｅ/Ｏ）５０と光ファイバ４１で接続されて部分放電信号を測定する部分放電測定部（ＰＤＭ）５１と、部分放電測定部（ＰＤＭ）５１に信号線４２を介して接続されるポータブル・コンピュータ（ＰＣ）５２と、部分放電測定部（ＰＤＭ）５１に信号線４３を介して接続されるスペクトラムアナライザ（ＳＰＥＣ）５３と、部分放電測定部（ＰＤＭ）５１に信号線４４を介して接続されて部分放電波形を観測するオシロスコープ（ＯＳＣ）５４とを有する。   Moreover, as what detects a partial discharge signal from the power cable 10, the high frequency current transformer 30 provided in the bypass line 21 so that attachment or detachment is possible, and the electro-optic conversion part (connected to the high frequency current transformer 30 via the lead wire 40 ( E / O) 50, an electro-optic conversion unit (E / O) 50 and an optical fiber 41 connected to each other, a partial discharge measuring unit (PDM) 51 for measuring a partial discharge signal, and a signal to the partial discharge measuring unit (PDM) 51 Portable computer (PC) 52 connected via line 42, spectrum analyzer (SPEC) 53 connected to partial discharge measurement unit (PDM) 51 via signal line 43, and partial discharge measurement unit (PDM) And an oscilloscope (OSC) 54 for observing the partial discharge waveform.

バイパス線２１は、金属シース１３Ａ及び金属シース１３Ｂとの間に２個のコンデンサ２０を有し、金属シース１３Ａ及び金属シース１３Ｂの表面に図示しないそれぞれ箔電極を介して固定することにより、低インピーダンスの測定用閉回路を形成している。第１の実施の形態において測定用閉回路は、導体１１−絶縁体１２−金属シース１３Ａ−バイパス線２１−コンデンサ２０−バイパス線２１−高周波変流器３０−バイパス線２１−コンデンサ２０−バイパス線２１−金属シース１３Ｂ−絶縁体１２−導体１１となる。ここでコンデンサ２０は、それぞれ５００ｐＦ以上の容量を有するものを用いることが好ましい。なお、コンデンサは図示する２個以外の数で構成されても良い。   The bypass line 21 has two capacitors 20 between the metal sheath 13A and the metal sheath 13B, and is fixed to the surfaces of the metal sheath 13A and the metal sheath 13B via respective foil electrodes (not shown), thereby reducing the impedance. A closed circuit for measurement is formed. In the first embodiment, the measurement closed circuit includes: conductor 11-insulator 12-metal sheath 13A-bypass line 21-capacitor 20-bypass line 21-high frequency current transformer 30-bypass line 21-capacitor 20-bypass line. 21-metal sheath 13B-insulator 12-conductor 11 Here, it is preferable to use a capacitor 20 having a capacitance of 500 pF or more. Note that the number of capacitors may be other than the two illustrated.

一般に、箔電極と検出インピーダンスを用いて部分放電を検出する場合、インピーダンス整合を得るために５００Ωから１ＫΩ程度の検出インピーダンスが広く用いられており、部分放電測定は検出インピーダンスの両端に生じる電圧を検出することにより行われる。このような検出インピーダンスを用いる部分放電測定では、部分放電に基づく高周波信号に対して実質的に開放されている状態と同様の高インピーダンスとなる。   In general, when a partial discharge is detected using a foil electrode and a detection impedance, a detection impedance of about 500Ω to 1KΩ is widely used to obtain impedance matching, and the partial discharge measurement detects a voltage generated at both ends of the detection impedance. Is done. In the partial discharge measurement using such detection impedance, the high impedance is the same as in the state of being substantially open to the high frequency signal based on the partial discharge.

第１の実施の形態のバイパス線２１は、箔電極を介して金属シース１３Ａと金属シース１３Ｂの表面にそれぞれ固定されており、さらにコンデンサ２０を有することで、商用周波数（５０Ｈｚ〜６０Ｈｚ）に対しては高インピーダンスとなるが、部分放電の周波数帯域（１００ｋＨｚ〜１００ＭＨｚ）である高周波信号に対しては低インピーダンスとなる。   The bypass line 21 of the first embodiment is fixed to the surfaces of the metal sheath 13A and the metal sheath 13B via foil electrodes, respectively, and further includes a capacitor 20 so that the commercial frequency (50 Hz to 60 Hz) can be obtained. However, the impedance is low for a high-frequency signal in the frequency band of partial discharge (100 kHz to 100 MHz).

次に、第１の実施の形態における部分放電測定動作について説明する。電力ケーブル１０の外周に設置した絶縁筒１４近傍で部分放電が発生すると、パルス状の部分放電電流が金属シース１３Ａからコンデンサ２０を有するバイパス線２１に流れる。高周波変流器３０は、バイパス線２１に流れる部分放電電流に基づいて生じた電流を信号線４０を介して電光変換部（Ｅ/Ｏ）５０に出力する。   Next, the partial discharge measurement operation in the first embodiment will be described. When partial discharge occurs in the vicinity of the insulating cylinder 14 installed on the outer periphery of the power cable 10, a pulsed partial discharge current flows from the metal sheath 13 </ b> A to the bypass line 21 having the capacitor 20. The high-frequency current transformer 30 outputs a current generated based on the partial discharge current flowing through the bypass line 21 to the electro-optic conversion unit (E / O) 50 via the signal line 40.

電光変換部（Ｅ/Ｏ）５０は、信号線４０を介して入力する電流を光信号に変換し、光ファイバ４１を介して部分放電測定装置（ＰＤＭ）５１に出力する。部分放電測定装置（ＰＤＭ）５１は、光ファイバ４１を介して入力する光信号を入力することにより部分放電を測定する。この部分放電測定装置（ＰＤＭ）５１は、ポータブル・コンピュータ（ＰＣ）５２から操作信号を入力することにより、部分放電測定の開始及び停止が制御される。部分放電測定に伴い、スペクトラムアナライザ（ＳＰＥＣ）５３で光信号に含まれる周波数成分が可視的に表示され、オシロスコープ（ＯＳＣ）５４で部分放電測定中の波形観測状況が表示される。   The electro-optic converter (E / O) 50 converts the current input via the signal line 40 into an optical signal and outputs the optical signal to the partial discharge measuring device (PDM) 51 via the optical fiber 41. The partial discharge measuring device (PDM) 51 measures a partial discharge by inputting an optical signal input through the optical fiber 41. The partial discharge measurement device (PDM) 51 is controlled by inputting an operation signal from a portable computer (PC) 52 to start and stop partial discharge measurement. Along with the partial discharge measurement, the spectrum analyzer (SPEC) 53 visually displays the frequency component included in the optical signal, and the oscilloscope (OSC) 54 displays the waveform observation status during the partial discharge measurement.

（第１の実施の形態の効果）
上記した第１の実施の形態によると、絶縁筒１４を介して接続された金属シース１３Ａ及び１３Ｂとの間にコンデンサ２０を有する低インピーダンスのバイパス線２１を設け、このバイパス線２１に流れる部分放電電流を高周波変流器３０で検出するようにしたので、部分放電信号を商用周波数から容易に分離できるとともに、部分放電信号に空気伝搬した外来ノイズが重畳しにくいことから、検出感度を向上させることができる。 (Effects of the first embodiment)
According to the first embodiment described above, the low impedance bypass line 21 having the capacitor 20 is provided between the metal sheaths 13 </ b> A and 13 </ b> B connected via the insulating cylinder 14, and the partial discharge flowing through the bypass line 21 is provided. Since the current is detected by the high-frequency current transformer 30, the partial discharge signal can be easily separated from the commercial frequency, and the external noise propagated in the air is difficult to be superimposed on the partial discharge signal, thereby improving the detection sensitivity. Can do.

［第２の実施の形態］
図２は、本発明の第２の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。なお、以下の説明において、第１の実施の形態と同様の構成及び機能を有する部分については共通の符号を付している。 [Second Embodiment]
FIG. 2 is a diagram showing a configuration used to perform partial discharge measurement according to the second embodiment of the present invention. In the following description, portions having the same configuration and function as those of the first embodiment are denoted by common reference numerals.

第２の実施の形態は、第１の実施の形態で説明した金属シース１３Ａ及び金属シース１３Ｂとの間に設けられる絶縁膜１４が、金属シース１３Ａ及び金属シース１３Ｂとを固定するボルト１３２及びナット１３３で短絡されている点、及び絶縁筒１４の表面に設けられる箔電極３１と金属シース１３Ｂとの間にバイパス線２１を設けている点において、第１の実施の形態と相違している。   In the second embodiment, the insulating film 14 provided between the metal sheath 13A and the metal sheath 13B described in the first embodiment has a bolt 132 and a nut for fixing the metal sheath 13A and the metal sheath 13B. The second embodiment is different from the first embodiment in that the bypass wire 21 is provided between the foil electrode 31 provided on the surface of the insulating cylinder 14 and the metal sheath 13B.

金属シース１３Ａ及び金属シース１３Ｂは、フランジ１３ａを有し、このフランジ１３ａとの間に設けられる絶縁筒１４をボルト１３２及びナット１３３の締付けにより固定している。絶縁筒１４は、ボルト１３２及びナット１３３によって短絡されていることにより、金属シース１３Ａと金属シース１３Ｂとの間のインピーダンスはほぼ０になる。   The metal sheath 13A and the metal sheath 13B have a flange 13a, and the insulating cylinder 14 provided between the metal sheath 13A and the metal sheath 13B is fixed by tightening a bolt 132 and a nut 133. Since the insulating cylinder 14 is short-circuited by the bolt 132 and the nut 133, the impedance between the metal sheath 13A and the metal sheath 13B becomes almost zero.

バイパス線２１は、箔電極３１と金属シース１３Ｂとを接続しており、そのことによって導体１１を流れる部分放電電流を絶縁筒１４を介して取り出す低インピーダンスの閉回路を形成している。電力ケーブル１０の絶縁筒１４近傍で部分放電が発生すると、部分放電電流が絶縁筒１４から箔電極３１を介してバイパス線２１に流れる。高周波変流器３０は、バイパス線２１に流れる部分放電電流に基づいて生じた電流を信号線４０を介して電光変換部（Ｅ/Ｏ）５０に出力する。   The bypass line 21 connects the foil electrode 31 and the metal sheath 13 </ b> B, thereby forming a low-impedance closed circuit that takes out the partial discharge current flowing through the conductor 11 through the insulating cylinder 14. When a partial discharge occurs in the vicinity of the insulating tube 14 of the power cable 10, a partial discharge current flows from the insulating tube 14 to the bypass line 21 through the foil electrode 31. The high-frequency current transformer 30 outputs a current generated based on the partial discharge current flowing through the bypass line 21 to the electro-optic conversion unit (E / O) 50 via the signal line 40.

（第２の実施の形態の効果）
上記した第２の実施の形態によると、ボルト１３２及びナット１３３によって短絡された絶縁筒１４の表面に箔電極３１を介してバイパス線２１の一端を接続し、バイパス線２１の他端を金属シースに接続するようにしても、箔電極３１と測定対象である電力ケーブル１０の外周に設置した絶縁筒１４の一部を用いてコンデンサを設けることができ、第１の実施の形態と同様に部分放電信号に空気伝搬した外来ノイズが重畳しにくく、良好な検出感度が得られる。なお、第２の実施の形態では、バイパス線２１の他端を金属シース１３Ｂに接続する構成を説明したが、金属シース１３Ａに接続しても良い。 (Effect of the second embodiment)
According to the second embodiment described above, one end of the bypass line 21 is connected to the surface of the insulating cylinder 14 short-circuited by the bolt 132 and the nut 133 via the foil electrode 31, and the other end of the bypass line 21 is connected to the metal sheath. The capacitor can be provided by using the foil electrode 31 and a part of the insulating cylinder 14 installed on the outer periphery of the power cable 10 to be measured, as in the first embodiment. It is difficult to superimpose external noise that has propagated in the air on the discharge signal, and good detection sensitivity can be obtained. In the second embodiment, the configuration in which the other end of the bypass line 21 is connected to the metal sheath 13B has been described, but it may be connected to the metal sheath 13A.

［第３の実施の形態］
図３は、本発明の第３の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。 [Third Embodiment]
FIG. 3 is a diagram showing a configuration used for performing partial discharge measurement according to the third embodiment of the present invention.

第３の実施の形態は、第１の実施の形態で説明したコンデンサ２０を有するバイパス線２１を接地線として設け、金属シース１３と接地との間に低インピーダンスの閉回路を設けている点において、第１の実施の形態と相違している。   In the third embodiment, the bypass line 21 having the capacitor 20 described in the first embodiment is provided as a ground line, and a low-impedance closed circuit is provided between the metal sheath 13 and the ground. This is different from the first embodiment.

バイパス線２１は、任意の長さで金属シース１３Ａと接地との間に設けられており、そのことによって低インピーダンスのバイパス回路を形成している。   The bypass line 21 has an arbitrary length and is provided between the metal sheath 13A and the ground, thereby forming a low impedance bypass circuit.

（第３の実施の形態の効果）
上記した第３の実施の形態によると、金属シース１３と接地との間にコンデンサ２０を有するバイパス線２１を設けているので、部分放電の測定対象として、系統運用上、金属シース１３を直接接地できない場合があっても、商用周波数に対しては高インピーダンスで、部分放電に基づく高周波信号に対しては低インピーダンスのバイパス線２１を安全かつ容易に設けることができ、良好な検出感度で部分放電測定を行うことができる。 (Effect of the third embodiment)
According to the third embodiment described above, since the bypass line 21 having the capacitor 20 is provided between the metal sheath 13 and the ground, the metal sheath 13 is directly grounded as a measurement target of partial discharge for system operation. Even if this is not possible, the bypass line 21 having a high impedance for the commercial frequency and a low impedance for the high-frequency signal based on the partial discharge can be provided safely and easily, and the partial discharge with a good detection sensitivity. Measurements can be made.

また、図４に示すように、電力ケーブル１０で金属シース１３と接地との間に接地線２２が設けられているものでは、この接地線２２に高周波変流器３０を設ける方法も考えられるが、接地線２２の長さが大であると、コンダクタンス成分の存在によって高インピーダンスとなり、部分放電に基づく高周波信号が流れにくくなる。この場合についても第３の実施の形態のバイパス線２１は良好な検出感度で部分放電測定を行うことができる。   As shown in FIG. 4, in the case where the power cable 10 is provided with the ground wire 22 between the metal sheath 13 and the ground, a method of providing a high-frequency current transformer 30 on the ground wire 22 is also conceivable. If the length of the grounding wire 22 is large, the impedance becomes high due to the presence of the conductance component, and a high-frequency signal based on the partial discharge becomes difficult to flow. Also in this case, the bypass line 21 of the third embodiment can perform partial discharge measurement with good detection sensitivity.

［第４の実施の形態］
図５は、本発明の第４の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。 [Fourth Embodiment]
FIG. 5 is a diagram showing a configuration used for performing partial discharge measurement according to the fourth embodiment of the present invention.

第４の実施の形態は、測定対象としてガス絶縁開閉装置の設備ケース１６と、設備ケース上に設けられているブッシング１５とを有し、ブッシング１５を構成する碍子１７の表面に箔電極３１を設け、このブッシング１５と設備ケース１６との間をバイパス線２１で接続する点において、第１の実施の形態と相違している。   The fourth embodiment has an equipment case 16 of a gas insulated switchgear as a measurement target and a bushing 15 provided on the equipment case, and a foil electrode 31 is provided on the surface of an insulator 17 constituting the bushing 15. It is different from the first embodiment in that it is provided and the bushing 15 and the equipment case 16 are connected by a bypass line 21.

バイパス線２１は、ブッシング１５の下部表面に設けられる箔電極３１に一端を接続し、設備ケース１６の上部側面に設けられる接地板３２に他端が接続されている。このように接続することで、バイパス線２１とブッシング１５とがコンデンサカップリングされることにより、部分放電に基づく高周波信号に対して低インピーダンスの閉回路が形成される。   The bypass line 21 has one end connected to a foil electrode 31 provided on the lower surface of the bushing 15, and the other end connected to a ground plate 32 provided on the upper side surface of the equipment case 16. By connecting in this way, the bypass line 21 and the bushing 15 are capacitor-coupled to form a closed circuit having a low impedance with respect to the high-frequency signal based on the partial discharge.

（第４の実施の形態の効果）
上記した第４の実施の形態によると、ガス絶縁開閉装置においてもケーブル及びケーブル端末部（箱）等の測定対象と同様にコンデンサカップリングに基づく低インピーダンスの閉回路を設けることで、従来、対地コンデンサを用いて行っていた電力ケーブルの絶縁接続部における部分放電測定方法に比べて検出感度に優れる部分放電測定を行うことができる。 (Effect of the fourth embodiment)
According to the fourth embodiment described above, in the gas insulated switchgear as well, a low impedance closed circuit based on the capacitor coupling is provided in the same manner as the measurement object such as the cable and the cable terminal (box). Compared to the partial discharge measurement method in the insulated connection portion of the power cable, which has been performed using a capacitor, it is possible to perform partial discharge measurement with excellent detection sensitivity.

なお、第４の実施の形態では、ガス絶縁開閉装置に部分放電を測定するための低インピーダンスの閉回路を設ける構成を説明したが、例えば、変圧器の気中端末部（箱）等についても同様に部分放電の測定が可能である。   In the fourth embodiment, the configuration in which the gas-insulated switchgear is provided with a low-impedance closed circuit for measuring partial discharge has been described. However, for example, the air terminal portion (box) of a transformer, etc. Similarly, partial discharge can be measured.

［第５の実施の形態］
図６は、本発明の第５の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。 [Fifth Embodiment]
FIG. 6 is a diagram showing a configuration used for performing partial discharge measurement according to the fifth embodiment of the present invention.

第５の実施の形態は、第４の実施の形態で説明したブッシング１５について、同一電源で課電された同位相の２相の測定対象の間にバイパス線２１を設け、このバイパス線２１から部分放電信号を高周波変流器３０で取り出す点において、第４の実施の形態と相違している。   In the fifth embodiment, with respect to the bushing 15 described in the fourth embodiment, a bypass line 21 is provided between the two-phase measurement targets of the same phase that are charged by the same power source. The fourth embodiment is different from the fourth embodiment in that the partial discharge signal is extracted by the high-frequency current transformer 30.

２相のブッシングは、複導体線路を構成するブッシングであって、例えば、Ｒ相の碍子１７Ａと碍子１７Ｂとを有し、碍子１７Ａの基部である下部金具１８Ａと、碍子１７Ｂの基部である下部金具１８Ｂとが２個のコンデンサ２０を有したバイパス線２１で接続されるとともに、碍子１７Ａの上部金具１７０と碍子１７Ｂの上部金具１７１の上部とが連接線１９で接続されることによって低インピーダンスの閉回路を形成している。なお、第５の実施の形態では、同位相間を連接線１９で接続するものとしてＲ相のブッシング同士を接続する構成を説明したが、Ｔ相又はＳ相同士の測定対象を接続する構成であっても良い。   The two-phase bushing is a bushing that constitutes a multi-conductor line, and includes, for example, an R-phase insulator 17A and an insulator 17B, a lower metal fitting 18A that is a base portion of the insulator 17A, and a lower portion that is a base portion of the insulator 17B. The metal fitting 18B is connected by the bypass line 21 having the two capacitors 20, and the upper metal fitting 170 of the insulator 17A and the upper portion of the upper metal fitting 171 of the insulator 17B are connected by the connecting wire 19, so that the low impedance. A closed circuit is formed. In the fifth embodiment, the configuration in which the R-phase bushings are connected to each other by connecting the same phase with the connecting line 19 is described. However, the measurement target of the T-phase or the S-phase is connected. May be.

（第５の実施の形態の効果）
上記した第５の実施の形態によると、同位相の２相の測定対象の間に布設したバイパス線２１によって低インピーダンスの閉回路を設けることで、検出感度に優れ、単相での部分放電測定と比べて効率良く部分放電測定を行うことができる。部分放電が生じている場合、その発生源がどの相に生じているかは、部分放電測定装置（ＰＤＭ）５１で位相を調べることにより把握することができる。 (Effect of 5th Embodiment)
According to the fifth embodiment described above, a closed circuit having a low impedance is provided by the bypass line 21 provided between the two-phase measurement objects having the same phase, so that the detection sensitivity is excellent and the partial discharge measurement in a single phase is performed. It is possible to perform partial discharge measurement more efficiently than. When a partial discharge has occurred, it can be determined in which phase the generation source is generated by examining the phase with a partial discharge measuring device (PDM) 51.

［第６の実施の形態］
図７は、本発明の第６の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。 [Sixth Embodiment]
FIG. 7 is a diagram showing a configuration used for performing partial discharge measurement according to the sixth embodiment of the present invention.

第６の実施の形態は、第５の実施の形態で説明した同一電源で課電された同位相の２相間を接続するバイパス線２１を設ける構成を絶縁筒１４Ａ，１４Ｂで分割された電力ケーブル１０Ａ，１０Ｂに適用した点において、第５の実施の形態と相違している   In the sixth embodiment, a power cable divided by insulating cylinders 14A and 14B in a configuration in which a bypass line 21 for connecting two phases having the same phase, which is applied by the same power source as described in the fifth embodiment, is provided. It differs from the fifth embodiment in that it is applied to 10A and 10B.

電力ケーブル１０Ａは、金属シース１３０Ａと金属シース１３０Ｂとが絶縁筒１４Ａによって分割されており、電力ケーブル１０Ｂは、金属シース１３１Ａと金属シース１３１Ｂとが絶縁筒１４Ｂによって分割されている。金属シース１３０Ａと金属シース１３１Ａとの間にはバイパス線２１Ａが設けられており、金属シース１３０Ｂと金属シース１３１Ｂとの間にはバイパス線２１Ｂが設けられている。また、バイパス線２１Ａとバイパス線２１Ｂは、バイパス線の一部を構成する短絡線２２によって接続されており、短絡線２２には高周波変流器３０が設けられている。また、連接線１９は２つの導体１１Ａ（例えば、Ｒ相）を接続している。   In the power cable 10A, a metal sheath 130A and a metal sheath 130B are divided by an insulating cylinder 14A, and in the power cable 10B, a metal sheath 131A and a metal sheath 131B are divided by an insulating cylinder 14B. A bypass line 21A is provided between the metal sheath 130A and the metal sheath 131A, and a bypass line 21B is provided between the metal sheath 130B and the metal sheath 131B. Further, the bypass line 21 </ b> A and the bypass line 21 </ b> B are connected by a short-circuit line 22 that constitutes a part of the bypass line, and the short-circuit line 22 is provided with a high-frequency current transformer 30. Further, the connecting line 19 connects two conductors 11A (for example, R phase).

（第６の実施の形態の効果）
上記した第６の実施の形態によると、絶縁筒で分割された同位相の２相のケーブルであっても、第５の実施の形態と同様に検出感度に優れ、単相での部分放電測定と比べて効率良く部分放電測定を行うことができる。 (Effect of 6th Embodiment)
According to the sixth embodiment described above, even in the case of a two-phase cable having the same phase divided by an insulating cylinder, it is excellent in detection sensitivity as in the fifth embodiment, and a partial discharge measurement in a single phase. It is possible to perform partial discharge measurement more efficiently than.

［他の実施の形態］
なお、本発明は、上記実施の形態に限定されず、本発明の技術思想を逸脱あるいは変更しない範囲内で種々な変形が可能である。例えば、金属シースは表面が防食層で覆われているものであっても良い。 [Other embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from or changing the technical idea of the present invention. For example, the metal sheath may have a surface covered with an anticorrosion layer.

図１は、本発明の第１の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。FIG. 1 is a diagram showing a configuration used for performing partial discharge measurement according to the first embodiment of the present invention. 図２は、本発明の第２の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。FIG. 2 is a diagram showing a configuration used to perform partial discharge measurement according to the second embodiment of the present invention. 図３は、本発明の第３の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。FIG. 3 is a diagram showing a configuration used for performing partial discharge measurement according to the third embodiment of the present invention. 図４は、金属シースと接地との間に接地線が設けられている電力ケーブル部分的に示す図である。FIG. 4 is a diagram partially showing a power cable in which a ground wire is provided between the metal sheath and the ground. 図５は、本発明の第４の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。FIG. 5 is a diagram showing a configuration used for performing partial discharge measurement according to the fourth embodiment of the present invention. 図６は、本発明の第５の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。FIG. 6 is a diagram showing a configuration used for performing partial discharge measurement according to the fifth embodiment of the present invention. 図７は、本発明の第６の実施の形態に係る部分放電測定を行うために用いた構成を示す図である。FIG. 7 is a diagram showing a configuration used for performing partial discharge measurement according to the sixth embodiment of the present invention.

符号の説明Explanation of symbols

１０…電力ケーブル、１１…導体、１２…絶縁体、１３，１３Ａ，１３Ｂ，１３０Ａ，１３０Ｂ，１３１Ａ，１３１Ｂ…金属シース、１３ａ…フランジ、１４，１４Ａ，１４Ｂ…絶縁筒、１５…ブッシング、１６…設備ケース、１７，１７Ａ，１７Ｂ…碍子、１８Ａ，１８Ｂ…基部、１９…連接線、２０…コンデンサ、２１，２１Ａ，２１Ｂ…バイパス線、２２…短絡線、３０…高周波変流器、３１…箔電極、４０，４２，４３，４４…リード線、４１…光ファイバ、５１…部分放電測定装置（ＰＤＭ）、５２…ポータブル・コンピュータ（ＰＣ）、５３…スペクトラムアナライザ（ＳＰＥＣ）、５４…オシロスコープ（ＯＳＣ）、１３２…ボルト、１３３…ナット、１７０…上部金具、１７１…上部金具 DESCRIPTION OF SYMBOLS 10 ... Electric power cable, 11 ... Conductor, 12 ... Insulator, 13, 13A, 13B, 130A, 130B, 131A, 131B ... Metal sheath, 13a ... Flange, 14, 14A, 14B ... Insulating cylinder, 15 ... Bushing, 16 ... Equipment case, 17, 17A, 17B ... insulator, 18A, 18B ... base, 19 ... connecting wire, 20 ... capacitor, 21, 21A, 21B ... bypass wire, 22 ... short-circuit wire, 30 ... high frequency current transformer, 31 ... foil Electrode, 40, 42, 43, 44 ... lead wire, 41 ... optical fiber, 51 ... partial discharge measuring device (PDM), 52 ... portable computer (PC), 53 ... spectrum analyzer (SPEC), 54 ... oscilloscope (OSC) ), 132 ... Bolt, 133 ... Nut, 170 ... Upper bracket, 171 ... Upper bracket

Claims (6)

商用周波数におけるインピーダンスに対して部分放電の周波数帯域におけるインピーダンスが小となるコンデンサを有した測定用閉回路を測定対象の外部に設け、
前記測定用閉回路を流れる部分放電電流を高周波変流器で検出することを特徴とする部分放電測定方法。 A closed circuit for measurement having a capacitor whose impedance in the frequency band of partial discharge is smaller than the impedance at the commercial frequency is provided outside the measurement target,
A partial discharge measuring method, wherein a partial discharge current flowing through the measurement closed circuit is detected by a high-frequency current transformer. 前記測定対象の外周に設置した絶縁筒で分割されたシース間を、前記コンデンサを介して接続して部分放電に基づく電流を通過させる前記測定用閉回路を形成することを特徴とする請求項１に記載の部分放電測定方法。   The closed circuit for measurement is formed by connecting between sheaths divided by an insulating cylinder installed on the outer periphery of the measurement object via the capacitor to pass a current based on partial discharge. The partial discharge measuring method of description. 前記コンデンサを箔電極と前記測定対象を構成する絶縁物の一部を用いて形成することを特徴とする請求項１に記載の部分放電測定方法。   The partial discharge measuring method according to claim 1, wherein the capacitor is formed by using a foil electrode and a part of an insulator constituting the measurement object. 前記測定用閉回路を前記測定対象と接地との間に設けることを特徴とする請求項１に記載の部分放電測定方法。   The partial discharge measurement method according to claim 1, wherein the measurement closed circuit is provided between the measurement object and ground. 前記測定用閉回路を前記測定対象と設備ケースとの間に設けることを特徴とする請求項１に記載の部分放電測定方法。   The partial discharge measurement method according to claim 1, wherein the measurement closed circuit is provided between the measurement object and an equipment case. 複数の前記測定対象を前記コンデンサを介して接続して前記測定用閉回路を形成することを特徴とする請求項１に記載の部分放電測定方法。   The partial discharge measurement method according to claim 1, wherein the measurement closed circuit is formed by connecting a plurality of measurement objects via the capacitor.
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