JPS6341430B2 - - Google Patents
Info
- Publication number
- JPS6341430B2 JPS6341430B2 JP6030580A JP6030580A JPS6341430B2 JP S6341430 B2 JPS6341430 B2 JP S6341430B2 JP 6030580 A JP6030580 A JP 6030580A JP 6030580 A JP6030580 A JP 6030580A JP S6341430 B2 JPS6341430 B2 JP S6341430B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- partial discharge
- power source
- measurement
- voltage
- 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
Links
- 239000004020 conductor Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims 2
- 238000005259 measurement Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 2
- 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
- 238000000691 measurement method Methods 0.000 description 2
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Description
【発明の詳細な説明】
本発明は電気ケーブルの部分放電測定法の改良
に係り、特にノイズを除去して真の部分放電の測
定を行ない得る電気ケーブルの部分放電測定法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for measuring partial discharges in electric cables, and more particularly to a method for measuring partial discharges in electric cables that can remove noise and measure true partial discharges.
一般に、電気ケーブルの部分放電の測定は第１
図に示すようにして行なわれている。すなわち、
電気ケーブル１の一端の導体２には測定電源３の
一出力端子が接続され、測定電源の他方の出力端
子は接地されている。測定電源３とケーブル導体
２終端間の導線上の一点は、結合コンデンサ４お
よびこれに直列に設けた検出インピーダンス５を
介して接地されている。 Generally, the measurement of partial discharge in electrical cables is done in the first step.
This is done as shown in the figure. That is,
One output terminal of a measurement power source 3 is connected to the conductor 2 at one end of the electric cable 1, and the other output terminal of the measurement power source 3 is grounded. A point on the conductor between the measurement power source 3 and the end of the cable conductor 2 is grounded via a coupling capacitor 4 and a detection impedance 5 provided in series therewith.
また、ケーブル遮蔽層の一点６は接地されてい
る。 Further, one point 6 of the cable shielding layer is grounded.
検出インピーダンス５の＋側は極性判別器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 + side of the detection impedance 5 is connected to a measuring device 9 via a polarity discriminator 7 and a gate 8 .
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５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 impedance 5 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
５で検出される。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５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 by the detection impedance 5. However, since external noise enters between the high voltage and the ground, it is detected by the detection impedance 5 as having the same polarity.
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にな
る。 Therefore, if the discriminator is provided with the above function, partial discharge can be measured correctly.
しかしながら、外来雑音の発生数が非常に多い
と、ゲート８が不通過となつている時間が非常に
多くなるため、例え信号であつても通過できなく
なる。 However, if the number of external noises generated is very large, the time during which the gate 8 is not allowed to pass becomes very large, so that even a signal cannot pass.
例えば、外来雑音が測定電源の周波数と同期し
て発生し、また部分放電も測定電源の周波数と同
期して発生しているとすると、前述の測定法で外
来雑音を除去すると部分放電による信号も一緒に
除去されてしまい、真の部分放電の発生数よりも
少ないパルス数しか観測できない欠点がある。 For example, if external noise is generated in synchronization with the frequency of the power supply to be measured, and partial discharge is also generated in synchronization with the frequency of the power supply to be measured, if the external noise is removed using the measurement method described above, the signal due to partial discharge will also be removed. There is a drawback that only a smaller number of pulses than the number of true partial discharges can be observed because they are removed together.
本発明はこのような点に着目してなされたもの
で、測定電源の周波数と周囲の電源周波数とを違
えることにより前述の欠点を解消した部分放電測
定法を提供することを目的としている。 The present invention has been made with attention to these points, and an object of the present invention is to provide a partial discharge measuring method that eliminates the above-mentioned drawbacks by differentiating the frequency of the measurement power source from the frequency of the surrounding power source.
以下、本発明を一実施例の図面に基づいて説明
する。第１図と同一部分に同一番号を付した第２
図において、測定電源３′の周波数は例えば周囲
の電気設備における電源の周波数が50Hzであると
きは60Hzとされ、60Hzであるときは50Hzとされて
いる。 Hereinafter, the present invention will be explained based on the drawings of one embodiment. The second figure has the same numbers attached to the same parts as in Figure 1.
In the figure, the frequency of the measurement power source 3' is, for example, 60 Hz when the frequency of the power source in the surrounding electrical equipment is 50 Hz, and 50 Hz when it is 60 Hz.
測定電源３の周波数は50もしくは60Hzに限定さ
れず例えば60Hz以上でも50Hz以下であつてもよ
く、あるいは0.1Hz程度の超低周波数でもよい。
電気設備の都合によつて周波数を違えることがで
きない場合は、測定電源の位相を違えてもよい。 The frequency of the measurement power source 3 is not limited to 50 or 60 Hz, and may be, for example, above 60 Hz or below 50 Hz, or may be an extremely low frequency of about 0.1 Hz.
If it is not possible to change the frequency due to electrical equipment, the phase of the measurement power source may be changed.
このようにすると、外来雑音と信号が混入して
いるパルス群が部分放電検出器で検出されるが、
たとえ、外来雑音と信号が同極性であつても、そ
れぞれのパルス発生に時間的なズレがあるので、
ゲート８のON、OFFにより信号だけを取り出す
ことが可能となる。従つて本発明においては外来
雑音の除去により信号まで消してしまうことを避
けることができる。 In this way, a group of pulses mixed with external noise and signals will be detected by the partial discharge detector, but
Even if the external noise and signal have the same polarity, there is a time lag in the generation of each pulse, so
By turning the gate 8 ON and OFF, it is possible to extract only the signal. Therefore, in the present invention, it is possible to avoid erasing the signal by removing the external noise.
以上述べた本発明においては、部分放電測定に
おけるノイズ除去装置の第一の問題点を解消で
き、もつてノイズ除去装置を有効に使用できるよ
うになる。すなわち、ノイズ除去装置による測定
誤差を解消することが可能となる。 In the present invention described above, the first problem of the noise removal device in partial discharge measurement can be solved, and the noise removal device can be used effectively. That is, it becomes possible to eliminate measurement errors caused by the noise removal device.
第１図は従来の測定法の回路図、第２図は本発
明の一実施例における回路図である。
２……導体、３′……測定電源、４……結合コ
ンデンサ、５……検出インピーダンス、８……ゲ
ート。
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. 2... Conductor, 3'... Measurement power supply, 4... Coupling capacitor, 5... Detection impedance, 8... Gate.
Claims (1)
外側に設けられた遮蔽層とを具備する電気ケーブ
ルの前記電気導体と前記遮蔽層間に電圧を印加
し、これによつて前記絶縁体中に発生する部分放
電を測定するものにおいて、前記電圧の周波数と
周囲の電源周波数とを違えることを特徴とする電
気ケーブルの部分放電測定法。1. Applying a voltage between the electrical conductor and the shielding layer of an electrical cable comprising an electrical conductor, an insulator surrounding the electrical conductor, and a shielding layer provided on the outside thereof, whereby a voltage is applied in the insulator. 1. A partial discharge measuring method for an electric cable, characterized in that the frequency of the voltage and the frequency of the surrounding power supply are different, in the method for measuring the partial discharge that occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6030580A JPS56155865A (en) | 1980-05-07 | 1980-05-07 | Method for measuring partial discharge of cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6030580A JPS56155865A (en) | 1980-05-07 | 1980-05-07 | Method for measuring partial discharge of cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56155865A JPS56155865A (en) | 1981-12-02 |
| JPS6341430B2 true JPS6341430B2 (en) | 1988-08-17 |
Family
ID=13138308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6030580A Granted JPS56155865A (en) | 1980-05-07 | 1980-05-07 | Method for measuring partial discharge of cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56155865A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543390A (en) * | 2013-09-25 | 2014-01-29 | 国家电网公司 | Method for denoising power transformer local discharge ultrahigh-frequency signals |
-
1980
- 1980-05-07 JP JP6030580A patent/JPS56155865A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56155865A (en) | 1981-12-02 |
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