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JPS6131826B2 - - Google Patents
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JPS6131826B2 - - Google Patents

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Publication number
JPS6131826B2
JPS6131826B2 JP16058379A JP16058379A JPS6131826B2 JP S6131826 B2 JPS6131826 B2 JP S6131826B2 JP 16058379 A JP16058379 A JP 16058379A JP 16058379 A JP16058379 A JP 16058379A JP S6131826 B2 JPS6131826 B2 JP S6131826B2
Authority
JP
Japan
Prior art keywords
detection
cable
polarity
pulses
partial discharge
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
Application number
JP16058379A
Other languages
Japanese (ja)
Other versions
JPS5682464A (en
Inventor
Yasumitsu Ebinuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SWCC Corp
Original Assignee
Showa Electric Wire and Cable Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Showa Electric Wire and Cable Co filed Critical Showa Electric Wire and Cable Co
Priority to JP16058379A priority Critical patent/JPS5682464A/en
Publication of JPS5682464A publication Critical patent/JPS5682464A/en
Publication of JPS6131826B2 publication Critical patent/JPS6131826B2/ja
Granted legal-status Critical Current

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  • Testing Relating To Insulation (AREA)

Description

【発明の詳細な説明】 本発明は電力ケーブルの部分放電測定法に係
る。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring partial discharges in power cables.

電力ケーブルの部分放電の測定は従来第1図に
示すようにして行われている。すなわち、一対の
ケーブルa,b導体1a,1bの一端2a,2b
には電極3の一出力端子と接続し、電極3の他方
の出力端子は接地する。電極3とケーブル導体終
端間の導線上の一点は、結合コンデンサ4a,4
bおよびそれに直列に設けた検出インピーダンス
5a,5bを介して接地されている。また、ケー
ブル遮蔽相6a,6b上の一点は接地されてい
る。
Measurement of partial discharge in power cables has conventionally been carried out as shown in FIG. That is, one end 2a, 2b of a pair of cables a, b conductors 1a, 1b
is connected to one output terminal of the electrode 3, and the other output terminal of the electrode 3 is grounded. One point on the conductor between the electrode 3 and the cable conductor termination is the coupling capacitor 4a, 4
b and detection impedances 5a and 5b provided in series therewith. Further, one point on the cable shielding phases 6a, 6b is grounded.

検出インピーダンス5a,5bの+側はそれぞ
れ極性判別器7およびゲート8を介して測定器9
に接続されている。
The + sides of the detection impedances 5a and 5b are connected to a measuring device 9 via a polarity discriminator 7 and a gate 8, respectively.
It is connected to the.

上記構成の測定回路において、極性判別器7は
検出インピーダンス5a,5bの検出パルスが極
性を同じくする時のみこれを不通過とする機能を
有している。
In the measuring circuit configured as described above, the polarity discriminator 7 has a function of not passing the detection pulses of the detection impedances 5a and 5b only when they have the same polarity.

電圧を印加してケーブル内部で部分放電が発生
したとすれば、そのパルスは検出インピーダンス
5a,5bの一方でのみ検出される。ところが、
外来雑音は、高圧とアース間に侵入するものであ
るから、検出インピーダンス5a,5bにおいて
同極性として検出される。
If a voltage is applied and a partial discharge occurs inside the cable, the pulse will be detected only by one of the detection impedances 5a and 5b. However,
Since external noise enters between the high voltage and the ground, it is detected as having the same polarity at the detection impedances 5a and 5b.

従つて、判別器に前記の機能を持たせておけ
ば、部分放電の測定を正しくなし得ることとな
る。
Therefore, if the discriminator is provided with the above function, partial discharge can be measured correctly.

しかしながら、例えば一方のケーブルaに大き
な部分放電が発生すると各検出インピーダンス5
a,5bにも同極性パルスが検出されるため、部
分放電パルスであつてもノズルと同様の取扱いと
なり、部分放電検出器9で検出されなくなる不都
合がある。
However, for example, if a large partial discharge occurs in one cable a, each detection impedance 5
Since pulses of the same polarity are also detected in a and 5b, even if they are partial discharge pulses, they are handled in the same way as a nozzle, and there is a problem that they are not detected by the partial discharge detector 9.

本発明はこのような点に着目してなされたもの
で、極性判別器の他に大きさのアンバランス検出
回路を設けることにより、前述の不都合を解消せ
んとするものである。
The present invention has been made with attention to these points, and is intended to solve the above-mentioned problems by providing a size imbalance detection circuit in addition to the polarity discriminator.

以下、本発明を一実施例の図面に基づいて説明
する。
Hereinafter, the present invention will be explained based on the drawings of one embodiment.

第1図と同一部分には同一符号を付した第2図
において、極性判別器7には大きさのアンバラン
ス検出回路10が接続され、該検出回路の出力が
ゲート8に導かれるようにされている。
In FIG. 2, the same parts as in FIG. ing.

このようにすると、一方のケーブルaで大きな
部分放電パルスが発生すると、検出インピーダン
ス5a,5bにパルス電圧が発生し、これらは同
極性であるためゲート8は不通過状態とされる。
In this way, when a large partial discharge pulse occurs in one cable a, a pulse voltage is generated in the detection impedances 5a and 5b, and since these have the same polarity, the gate 8 is set in a non-passing state.

そして、次にステツプの大きさのアンバランス
検出回路10で、例えば10:1程度のアンバラン
スが検出された場合には、ゲート8を通過状態に
し、部分放電パルスとして検出される。
Then, when the step size unbalance detection circuit 10 detects an unbalance of, for example, about 10:1, the gate 8 is set to a passing state and the pulse is detected as a partial discharge pulse.

一方、ノイズは同極性でしかもほぼ等しい大き
さのパルスとして検出されるのでゲート8は不通
過状態になり、従つてノイズは検出されない。
On the other hand, since noise is detected as pulses of the same polarity and approximately the same magnitude, the gate 8 is in a non-passing state, and therefore no noise is detected.

なお、図中、11a,11bはノイズ抑制用イ
ンピーダンスを示している。
In addition, in the figure, 11a and 11b indicate impedances for noise suppression.

以上述べた本発明においては、実布設ケーブル
の部分放電測定におけるノイズ除去が可能とな
り、しかも部分放電パルスはミスなく検出するこ
とができる。
In the present invention described above, it is possible to remove noise in partial discharge measurement of an actually installed cable, and moreover, partial discharge pulses can be detected without mistakes.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来の測定法の回路図、第2図は本発
明一実施例の回路図である。 a,b……ケーブル、1a,1b……ケーブル
導体、3……電源、4a,4b……結合コンデン
サ、5a,5b……検出インピーダンス、7……
極性判別器、8……ゲート、9……測定器、10
……大きさのアンバランス検出回路。
FIG. 1 is a circuit diagram of a conventional measurement method, and FIG. 2 is a circuit diagram of an embodiment of the present invention. a, b...cable, 1a, 1b...cable conductor, 3...power supply, 4a, 4b...coupling capacitor, 5a, 5b...detection impedance, 7...
Polarity discriminator, 8... Gate, 9... Measuring device, 10
...Size imbalance detection circuit.

Claims (1)

【特許請求の範囲】[Claims] 1 一対のケーブル導体に高電圧を印加し、それ
ぞれのケーブル導体一終端を、高圧側に極性判別
器を接続した検出インピーダンスを介して接地
し、検出パルスが同極性の時にはそのパルスを除
去して測定を行なう測定法において、前記各検出
インピーダンスに同極性でかつ大きさがアンバラ
ンスなパルスが入来したときのみ前記極性判別器
のゲートを開くようになしたことを特徴とする電
力ケーブルの部分放電測定法。
1 A high voltage is applied to a pair of cable conductors, one end of each cable conductor is grounded via a detection impedance with a polarity discriminator connected to the high voltage side, and when the detection pulses have the same polarity, the pulses are removed. A portion of a power cable characterized in that, in a measuring method for performing measurement, the gate of the polarity discriminator is opened only when a pulse of the same polarity and unbalanced magnitude enters each of the detection impedances. Discharge measurement method.
JP16058379A 1979-12-11 1979-12-11 Partial discharge measuring method of power cable Granted JPS5682464A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16058379A JPS5682464A (en) 1979-12-11 1979-12-11 Partial discharge measuring method of power cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16058379A JPS5682464A (en) 1979-12-11 1979-12-11 Partial discharge measuring method of power cable

Publications (2)

Publication Number Publication Date
JPS5682464A JPS5682464A (en) 1981-07-06
JPS6131826B2 true JPS6131826B2 (en) 1986-07-23

Family

ID=15718089

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16058379A Granted JPS5682464A (en) 1979-12-11 1979-12-11 Partial discharge measuring method of power cable

Country Status (1)

Country Link
JP (1) JPS5682464A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE508160C2 (en) 1997-03-10 1998-09-07 Abb Research Ltd Apparatus for sensing electrical discharges in a test object with two electrical connection conductors
JP5922508B2 (en) * 2012-06-20 2016-05-24 株式会社フジクラ Partial discharge measurement method

Also Published As

Publication number Publication date
JPS5682464A (en) 1981-07-06

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