JPH0568663B2 - - Google Patents
Info
- Publication number
- JPH0568663B2 JPH0568663B2 JP59178947A JP17894784A JPH0568663B2 JP H0568663 B2 JPH0568663 B2 JP H0568663B2 JP 59178947 A JP59178947 A JP 59178947A JP 17894784 A JP17894784 A JP 17894784A JP H0568663 B2 JPH0568663 B2 JP H0568663B2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- low
- power cable
- pass filter
- 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 - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、電力ケーブルに発生した部分放電パ
ルスを検出してケーブルの絶縁測定を行う方法に
関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for measuring the insulation of a power cable by detecting partial discharge pulses generated in the power cable.
（発明の技術的背景とその問題点）
従来、電力ケーブルにて電力を安定的に供給す
べく、ケーブルの絶縁状態を定期的又は活線状態
で検査することが行われている。(Technical Background of the Invention and Problems thereof) Conventionally, in order to stably supply electric power through a power cable, the insulation state of the cable has been inspected periodically or while the cable is live.
この検査方法の一つとして、電力ケーブルの劣
化部で発生する部分放電パルスを検出する方式の
絶縁測定方法が知られており、従来はこの部分放
電パルスの高周波成分を変流器（CT）により検
出し、この検出信号を測定回路側に送出すること
により電力ケーブルの絶縁状態を測定していた。 One known method for this inspection is an insulation measurement method that detects partial discharge pulses that occur in deteriorated parts of power cables. The insulation state of the power cable was measured by detecting the power cable and sending this detection signal to the measurement circuit.
しかし、このように部分放電パルスの高周波成
分を検出する場合には変流器により高周波ノイズ
も検出されてしまうため、部分放電パルスを正確
に検出することができず、従つて、絶縁状態を高
精度で測定することは不可能であつた。 However, when detecting the high frequency component of the partial discharge pulse in this way, the current transformer also detects high frequency noise, making it impossible to accurately detect the partial discharge pulse. It was impossible to measure with precision.
（発明の目的）
本発明の目的は、高周波ノイズの影響を受ける
ことなく部分放電パルスの発生を検出することが
できる電力ケーブルの絶縁測定方法を提供するこ
とにある。(Object of the Invention) An object of the present invention is to provide a method for measuring the insulation of a power cable that can detect the occurrence of partial discharge pulses without being affected by high frequency noise.
（発明の概要）
本発明は、絶縁測定すべき電力ケーブルの劣化
部に発生した部分放電パルスを検出し、前記電力
ケーブルの絶縁状態を測定する方法であつて、前
記電力ケーブルの遮蔽層と大地間にコンデンサを
接続し、このコンデンサの両端にローパスフイル
ターを接続し、このローパスフイルターの出力側
に積分回路を接続し、前記コンデンサに蓄積され
た信号を前記ローパスフイルターおよび前記積分
回路を介して検出信号として出力することを特徴
とする。(Summary of the Invention) The present invention is a method for measuring the insulation state of a power cable by detecting a partial discharge pulse generated in a deteriorated part of a power cable whose insulation is to be measured. A capacitor is connected between them, a low-pass filter is connected to both ends of this capacitor, an integrating circuit is connected to the output side of this low-pass filter, and the signal accumulated in the capacitor is detected via the low-pass filter and the integrating circuit. It is characterized by outputting as a signal.
（発明の実施例）
以下、本発明の実施例を図面を参照して詳細に
説明する。(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図には本発明方法に用いるパルス検出回路
が示されている。即ち、絶縁測定すべき電力ケー
ブル１の遮蔽層には低周波成分充電用のコンデン
サ２の一方の電極が接続され、このコンデンサ２
には他方の電極が接地された状態でローパスフイ
ルタ３が接続されている。このローパスフイルタ
３はコイル４及びコンデンサ５を含み、コンデン
サ５には積分回路６が接続されている。この積分
回路６は、コンデンサ５と並列に接続されている
可変抵抗器７と、演算増幅器８及び積分用コンデ
ンサ９を含み、可変抵抗器７の調整と積分用コン
デンサ９とにより所定の時定数が設定されてい
る。 FIG. 1 shows a pulse detection circuit used in the method of the invention. That is, one electrode of a capacitor 2 for charging low frequency components is connected to the shielding layer of the power cable 1 whose insulation is to be measured.
A low-pass filter 3 is connected to the low-pass filter 3 with the other electrode grounded. This low-pass filter 3 includes a coil 4 and a capacitor 5, and an integrating circuit 6 is connected to the capacitor 5. This integrating circuit 6 includes a variable resistor 7 connected in parallel with the capacitor 5, an operational amplifier 8, and an integrating capacitor 9, and a predetermined time constant is determined by adjusting the variable resistor 7 and integrating capacitor 9. It is set.
次に、本発明に係る絶縁測定方法を上記回路動
作と共に説明する。 Next, the insulation measuring method according to the present invention will be explained together with the above circuit operation.
電力ケーブル１に高電圧が印加されている場合
に該ケーブル１に劣化部×が存在すると、この劣
化部×で部分放電パルスが発生する。 When a high voltage is applied to the power cable 1 and a degraded portion x exists in the cable 1, a partial discharge pulse is generated in the degraded portion x.
この部分放電パルスは電力ケーブル１の遮蔽層
を通つてパルス検出回路に入力するが、その高周
波成分はローパスフイルタ３により積分回路６へ
の入力が阻止され、低周波成分充電用のコンデン
サ２を介してそのまま大地に流れ込む。 This partial discharge pulse is input to the pulse detection circuit through the shielding layer of the power cable 1, but its high frequency component is blocked from being input to the integrating circuit 6 by the low pass filter 3, and is passed through the capacitor 2 for charging the low frequency component. It just flows into the earth.
一方、部分放電パルスの低周波成分は、ローパ
スフイルタ３により積分回路６への入力が阻止さ
れるが、低周波成分充電用のコンデンサ２には充
電される。従つて、この充電電流はコンデンサ２
により直流電流としてローパスフイルタ３を通
り、可変抵抗器７により電圧変換されるので、積
分回路６からは所定の電圧波形を有する放電検出
信号が出力される。 On the other hand, the low-frequency component of the partial discharge pulse is blocked from being input to the integrating circuit 6 by the low-pass filter 3, but is charged to the capacitor 2 for charging the low-frequency component. Therefore, this charging current is
The DC current passes through the low-pass filter 3 and is converted into a voltage by the variable resistor 7, so that the integrating circuit 6 outputs a discharge detection signal having a predetermined voltage waveform.
これに対して、高周波ノイズは、部分放電パル
スの高周波成分と同様にローパスフイルタ３によ
り積分回路６への入力が阻止され、低周波成分充
電用のコンデンサ２を通つて大地に流れ込む。従
つて、高周波ノイズが積分回路６から検出信号と
して出力されることはない。 On the other hand, high-frequency noise, like the high-frequency component of the partial discharge pulse, is blocked from being input to the integrating circuit 6 by the low-pass filter 3, and flows into the ground through the capacitor 2 for charging the low-frequency component. Therefore, high frequency noise is not output from the integrating circuit 6 as a detection signal.
よつて、積分回路６からは電力ケーブル１で部
分放電パルスが生じた場合にのみ検出信号が出力
されるので、この検出信号を測定回路側のカウン
タやシンクロスコープに送ることにより部分放電
パルスの発生を正確に検出することができ、又こ
の検出信号の波形から放電パルス電圧の大きさ等
を正確に把握することができる。 Therefore, the integration circuit 6 outputs a detection signal only when a partial discharge pulse occurs in the power cable 1, so by sending this detection signal to the counter or synchroscope on the measurement circuit side, the generation of a partial discharge pulse can be performed. can be detected accurately, and the magnitude of the discharge pulse voltage can be accurately determined from the waveform of this detection signal.
尚、電力ケーブル１の遮蔽層を直接接地するこ
とができない場合には、第２図に示すように、電
力ケーブル１の遮蔽層に結合用コンデンサ１０を
容量結合し、部分放電パルスの周波数成分を取り
出すようにすればよい。 If the shielding layer of the power cable 1 cannot be directly grounded, a coupling capacitor 10 is capacitively coupled to the shielding layer of the power cable 1, as shown in FIG. Just take it out.
（発明の効果）
本発明によれば、電力ケーブルで生じた部分放
電パルスをコンデンサに蓄積させ、このコンデン
サに蓄積されて低周波成分となつた信号をローパ
スフイルターおよび積分回路を介して測定回路側
に送出するようにしたことで、高周波ノイズの影
響を受けることなく正確に部分放電パルスの発生
を検出することができる。従つて、電力ケーブル
の絶縁測定を高精度で行うことができる。(Effects of the Invention) According to the present invention, the partial discharge pulse generated in the power cable is accumulated in a capacitor, and the signal accumulated in the capacitor and turned into a low frequency component is sent to the measurement circuit via a low-pass filter and an integrating circuit. By sending out the partial discharge pulse, it is possible to accurately detect the occurrence of a partial discharge pulse without being affected by high frequency noise. Therefore, the insulation of power cables can be measured with high precision.
第１図は本発明方法に用いるパルス検出回路を
示す図、第２図は第１図のパルス検出回路の変形
例を示す図である。
１……電力ケーブル、２，５……コンデンサ、
３……ローパスフイルタ、６……積分回路、７…
…可変抵抗器、８……演算増幅器、１０……結合
用コンデンサ。
FIG. 1 is a diagram showing a pulse detection circuit used in the method of the present invention, and FIG. 2 is a diagram showing a modification of the pulse detection circuit shown in FIG. 1. 1... Power cable, 2, 5... Capacitor,
3...Low pass filter, 6...Integrator circuit, 7...
...Variable resistor, 8...Operation amplifier, 10...Coupling capacitor.
Claims (1)
した部分放電パルスを検出し、前記電力ケーブル
の絶縁状態を測定する方法であつて、前記電力ケ
ーブルの遮蔽層と大地間にコンデンサを接続し、
このコンデンサの両端にローパスフイルターを接
続し、このローパスフイルターの出力側に積分回
路を接続し、前記コンデンサに蓄積された信号を
前記ローパスフイルターおよび前記積分回路を介
して検出信号として出力することを特徴とする電
力ケーブルの絶縁測定方法。1. A method for measuring the insulation state of a power cable by detecting a partial discharge pulse generated in a deteriorated part of the power cable whose insulation is to be measured, the method comprising: connecting a capacitor between a shielding layer of the power cable and the ground;
A low-pass filter is connected to both ends of the capacitor, an integrating circuit is connected to the output side of the low-pass filter, and the signal accumulated in the capacitor is output as a detection signal via the low-pass filter and the integrating circuit. A method for measuring the insulation of power cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17894784A JPS6156979A (en) | 1984-08-28 | 1984-08-28 | Insulation measurement of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17894784A JPS6156979A (en) | 1984-08-28 | 1984-08-28 | Insulation measurement of power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6156979A JPS6156979A (en) | 1986-03-22 |
| JPH0568663B2 true JPH0568663B2 (en) | 1993-09-29 |
Family
ID=16057429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17894784A Granted JPS6156979A (en) | 1984-08-28 | 1984-08-28 | Insulation measurement of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6156979A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03170878A (en) * | 1989-11-29 | 1991-07-24 | Mitsubishi Electric Corp | Partial discharge detector |
| US5413799A (en) * | 1994-04-12 | 1995-05-09 | Wm. Wrigley Jr. Company | Method of making fruit-flavored chewing with prolonged flavor intensity |
| US5429827A (en) * | 1994-04-12 | 1995-07-04 | Wm. Wrigley Jr. Company | Method of making improved gum base for fruit-flavored chewing gum |
| PH31445A (en) * | 1994-04-12 | 1998-11-03 | Wrigley W M Jun Co | Fruit flavored chewing gum with prolonged flavor intensity. |
| JP5958318B2 (en) * | 2012-12-12 | 2016-07-27 | 日立金属株式会社 | Discharge charge amount measuring method and discharge charge amount measuring apparatus |
| CN103076545B (en) * | 2012-12-31 | 2015-09-23 | 广州供电局有限公司 | The charged linear measure longimetry of high-tension cable and Partial Discharge Detection location simulation system |
-
1984
- 1984-08-28 JP JP17894784A patent/JPS6156979A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6156979A (en) | 1986-03-22 |
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