JPH067147B2 - Partial discharge measurement method - Google Patents
Partial discharge measurement methodInfo
- Publication number
- JPH067147B2 JPH067147B2 JP32276988A JP32276988A JPH067147B2 JP H067147 B2 JPH067147 B2 JP H067147B2 JP 32276988 A JP32276988 A JP 32276988A JP 32276988 A JP32276988 A JP 32276988A JP H067147 B2 JPH067147 B2 JP H067147B2
- Authority
- JP
- Japan
- Prior art keywords
- partial discharge
- measuring
- detection impedance
- calibration
- connection portion
- 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
- 238000000691 measurement method Methods 0.000 title description 4
- 239000002184 metal Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は測定感度の較正が容易に行える部分放電測定方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a partial discharge measurement method capable of easily calibrating measurement sensitivity.
第４図(a)は従来の部分放電測定方法を示す。電力ケー
ブル10が中間接続部20を介して接続されており、両端に
終端接続部11が設けられている。終端接続部11には高電
圧課電端子12が設けられており、中間接続部20の金属シ
ース（金属胴管）は検出インピーダンス６を介してアー
スされている。検出インピーダンス６の両端の電位差を
検出するために測定器７が接続されている。尚、ＣKは
結合コンデンサである。FIG. 4 (a) shows a conventional partial discharge measuring method. A power cable 10 is connected via an intermediate connection portion 20, and terminal connection portions 11 are provided at both ends. The terminal connection portion 11 is provided with a high-voltage charging terminal 12, and the metal sheath (metal shell) of the intermediate connection portion 20 is grounded via the detection impedance 6. A measuring instrument 7 is connected to detect the potential difference across the detection impedance 6. Incidentally, C K is a coupling capacitor.
以上の構成において、高電圧課電端子12に高電圧を課電
する。この状態において、中間接続部20の絶縁体に部分
放電が生じると、導体および金属シースに高周波パルス
が誘起し、金属シースの高周波パルスが検出インピーダ
ンス６に流れてその両端に高周波パルスの大きさに比例
した電位差が生じる。その電位差を測定器７によって検
出することにより部分放電を測定する。With the above configuration, a high voltage is applied to the high voltage applying terminal 12. In this state, when a partial discharge occurs in the insulator of the intermediate connection portion 20, a high frequency pulse is induced in the conductor and the metal sheath, the high frequency pulse of the metal sheath flows into the detection impedance 6, and the magnitude of the high frequency pulse is generated at both ends thereof. A proportional potential difference occurs. The partial discharge is measured by detecting the potential difference by the measuring device 7.
測定器７の測定感度を較正するときは、高電圧端子12の
高電圧課電を停止し、較正信号発生器５を終端接続部11
の近傍に接続して電力ケーブル10の導体と金属シースの
間に較正用の高周波パルスを印加する。その等価回路を
第４図(b)に示す。第４図(b)に示すように、較正信号発
生器５はＶQボルトの高周波パルスを静電容量ＣQのコン
デンサを介して電力ケーブル10の導体８と金属シース１
の間に加える。導体８と金属シース１の間には静電容量
Ｃが形成され、静電容量Ｃのコンデンサを流れた高周波
パルスは検出インピーダンス６に分流する。このように
して測定器７の感度較正が行われる。ここで、静電容量
Ｃのコンデンサによる見掛けの放電電荷をＱとし、電位
差をＶ1とすると、 Ｑ＝ＶQ・ＣQ＝Ｖ1・Ｃ ………(1) (1)式より が得られる。When calibrating the measurement sensitivity of the measuring instrument 7, the high-voltage charging of the high-voltage terminal 12 is stopped and the calibration signal generator 5 is connected to the termination connecting portion 11.
A high-frequency pulse for calibration is applied between the conductor of the power cable 10 and the metal sheath by connecting in the vicinity of. The equivalent circuit is shown in Fig. 4 (b). As shown in FIG. 4 (b), the calibration signal generator 5 transmits the high frequency pulse of V Q volt via the capacitor of the capacitance C Q to the conductor 8 of the power cable 10 and the metal sheath 1.
Add between. A capacitance C is formed between the conductor 8 and the metal sheath 1, and the high frequency pulse that has flowed through the capacitor having the capacitance C is shunted to the detection impedance 6. In this way, the sensitivity of the measuring device 7 is calibrated. Here, if the apparent discharge charge by the capacitor of electrostatic capacity C is Q and the potential difference is V 1 , then Q = V Q · C Q = V 1 · C (1) (1) Is obtained.
しかし、従来の部分放電測定方法によると、電力ケーブ
ル線路が数Kmというように長尺になると、較正用の高周
波パルスが中間接続部20に伝送されてくるまで、そのレ
ベルＶ1が減衰するため、また、通常はＣ≫ＣQであるた
め、(2)式のＶ1の値が小さくなり、所定の較正操作を行
うことができないという不都合がある。更に、較正信号
発生器を接続する終端接続部の位置と較正操作を行う中
間接続部の位置が離れているため、作業性が悪いという
不都合がある。However, according to the conventional partial discharge measurement method, when the power cable line becomes long, for example, several Km, the level V 1 thereof is attenuated until the high frequency pulse for calibration is transmitted to the intermediate connection portion 20. In addition, since C >> C Q is normally satisfied, the value of V 1 in the equation (2) becomes small, and there is an inconvenience that a predetermined calibration operation cannot be performed. Further, since the position of the terminal connecting portion for connecting the calibration signal generator and the position of the intermediate connecting portion for performing the calibration operation are apart from each other, there is a disadvantage that workability is poor.
従って、本発明の目的は所定のレベルの較正信号を得る
ことができる部分放電測定方法を提供することである。Therefore, an object of the present invention is to provide a partial discharge measurement method capable of obtaining a predetermined level of calibration signal.
本発明の他の目的は較正操作の作業性を改善した部分放
電測定方法を提供することである。Another object of the present invention is to provide a partial discharge measuring method which improves the workability of the calibration operation.
本発明は、上記の目的を実現するため、絶縁接続部の絶
縁筒の両側の金属シース間に部分放電を測定する測定器
が接続される検出インピーダンスを接続し、 検出インピーダンスに並列に較正パルス発生器を接続
し、 較正パルス発生器より出力される較正パルスによって、
測定器を較正し、 高周波パルスに基づく検出インピーダンスの両端に生じ
る電位差を測定器によって測定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-mentioned object, the present invention connects a detection impedance connected to a measuring instrument for measuring partial discharge between metal sheaths on both sides of an insulation cylinder of an insulation connection, and generates a calibration pulse in parallel with the detection impedance. The calibration pulse output from the calibration pulse generator
There is provided a partial discharge measuring method characterized in that a measuring instrument is calibrated, and a potential difference generated at both ends of a detection impedance based on a high frequency pulse is measured by the measuring instrument.
以下、本発明の部分放電測定方法を詳細に説明する。 Hereinafter, the partial discharge measuring method of the present invention will be described in detail.
第１図は本発明の一実施例を示し、金属シース１に接続
された絶縁接続部の金属胴管２は絶縁筒３によって絶縁
されており、金属胴管２の端子４に較正信号発生器５お
よび検出インピーダンス６が並列になるように接続され
ている。検出インピーダンス６には測定器７が接続さ
れ、その両端の電位差を検出するようになっている。FIG. 1 shows an embodiment of the present invention, in which a metal barrel 2 of an insulating connection portion connected to a metal sheath 1 is insulated by an insulating cylinder 3, and a calibration signal generator is provided at a terminal 4 of the metal barrel 2. 5 and the detection impedance 6 are connected in parallel. A measuring instrument 7 is connected to the detection impedance 6 and detects the potential difference between both ends thereof.
第２図は第１図の実施例を回路的に示したものであり、
電力ケーブルの導体８は接続スリーブ９によって接続さ
れ、導体８と金属シース１の間に静電容量Ｃ1、Ｃ2のコ
ンデンサが形成され、金属シース１は絶縁筒３によって
絶縁されている。較正信号発生器５、検出インピーダン
ス６、および測定器７は第１図に示した通りである。FIG. 2 is a circuit diagram showing the embodiment of FIG.
The conductor 8 of the power cable is connected by a connecting sleeve 9, capacitors of electrostatic capacitances C 1 and C 2 are formed between the conductor 8 and the metal sheath 1, and the metal sheath 1 is insulated by the insulating tube 3. The calibration signal generator 5, the detection impedance 6 and the measuring device 7 are as shown in FIG.
第３図(a)は第２図の等価回路であり、同一部分は同一
の引用数字で示したので重複する説明は省略する。この
等価回路において、Ｃ1＝Ｃ2， Ｃ1》ＣQと仮定すると、 検出インピーダンス６の両端に加わる電位差Ｖ2は、 ここで、ＣQ、Ｃ、Ｃ2、ＶQは既知、あるいは測定可能
である。従来の技術で説明した(2)式と、本発明の(3)式
を比較すると、 Ｖ2＝２Ｖ1 ………(4) となる。ただし、Ｃ＝Ｃ1とした。(4)式より明らかなよ
うに、従来に比較して２倍のレベルで高周波パルスを検
出することが可能になり、しかも、長尺の電力ケーブル
を伝搬することによって生じる減衰を考慮する必要はな
い。FIG. 3 (a) is an equivalent circuit of FIG. 2, and the same portions are denoted by the same reference numerals, and thus duplicated description will be omitted. In this equivalent circuit, C 1 = C 2 , Assuming C 1 >> C Q , the potential difference V 2 applied to both ends of the detection impedance 6 is Here, C Q , C, C 2 , and V Q are known or measurable. Comparing the equation (2) explained in the prior art with the equation (3) of the present invention, V 2 = 2V 1 (4) However, C = C 1 . As is clear from equation (4), it becomes possible to detect high-frequency pulses at a level twice that of the conventional method, and it is necessary to consider the attenuation caused by propagating through a long power cable. Absent.
第３図(a)の等価回路は、静電容量Ｃ1のコンデンサの側
から部分放電が生じた場合の等価回路に変換すると第３
図(b)のようになる。The equivalent circuit of FIG. 3 (a) is converted to an equivalent circuit in the case where partial discharge occurs from the side of the capacitor having the electrostatic capacitance C 1
It looks like Figure (b).
以上の実施例では、Ｃ1＝Ｃ2、Ｚ≫ＺC2を条件として説
明したが、この条件を満たさない場合でも、基本式をも
とに補正項を求めることにより較正は可能である。In the above embodiments, C 1 = C 2 and Z >> Z C2 have been described as conditions, but even if these conditions are not satisfied, calibration is possible by obtaining the correction term based on the basic formula.
以上説明した通り、本発明の部分放電測定方法による
と、電力ケーブル線路における絶縁接続部の絶縁筒の両
側の金属シース間に検出インピーダンスと較正信号発生
器を並列に接続して挿入したため、以下の効果を奏する
ことができる。As described above, according to the partial discharge measuring method of the present invention, since the detection impedance and the calibration signal generator are connected in parallel between the metal sheaths on both sides of the insulating tube of the insulating connection portion of the power cable line, It is possible to exert an effect.
(1)長尺ケーブル線路の途中から部分放電の測定ができ
る。(1) Partial discharge can be measured from the middle of a long cable line.
(2)較正用の高周波パルスの波形の歪みや減衰が生じな
い。(2) The distortion or attenuation of the waveform of the high frequency pulse for calibration does not occur.
(3)較正信号発生器と測定器が同一の位置にあるため、
作業性が良い。(3) Since the calibration signal generator and the measuring instrument are in the same position,
Good workability.
(4)高圧導体に較正用の高周波パルスを注入する必要が
ないので安全性が高い。(4) The safety is high because it is not necessary to inject a high frequency pulse for calibration into the high voltage conductor.
(5)活線状態においても感度較正ができる。(5) Sensitivity can be calibrated even in a live state.
第１図は本発明の一実施例を示す説明図。第２図は第１
図の回路的な説明図。第３図(a)、(b)は第２図の等価回
路図、第４図(a)、(b)は従来の部分放電測定方法の説明
図および等価回路図。 符号の説明 １……金属シース、２……金属胴管 ３……絶縁筒、４……端子 ５……較正信号発生器 ６……検出インピーダンス ７……測定器、８……ケーブル導体 ９……接続スリーブ、10……電力ケーブル 11……終端接続部、20……中間接続部FIG. 1 is an explanatory view showing an embodiment of the present invention. Figure 2 shows the first
The circuit-like explanatory drawing of a figure. 3 (a) and 3 (b) are equivalent circuit diagrams of FIG. 2, and FIGS. 4 (a) and 4 (b) are explanatory diagrams and equivalent circuit diagrams of a conventional partial discharge measuring method. Explanation of reference numerals 1 ... Metal sheath, 2 ... Metal tube 3 ... Insulation cylinder, 4 ... Terminal 5 ... Calibration signal generator 6 ... Detection impedance 7 ... Measuring instrument, 8 ... Cable conductor 9 ... … Connection sleeve, 10… Power cable 11… Termination connection, 20… Intermediate connection
Claims (1)
分放電測定方法において、 前記絶縁接続部の絶縁筒の両側の金属シース間に部分放
電を測定する測定器が接続される検出インピーダンスを
接続し、 前記検出インピーダンスに並列に較正パルス発生器を接
続し、 前記較正パルス発生器より出力される較正パルスによっ
て、前記測定器を較正し、 高周波パルスに基づく前記検出インピーダンスの両端に
生じる電位差を前記測定器によって測定することを特徴
とする部分放電測定方法。1. A method for measuring a partial discharge in an insulation connection portion of a power cable line, wherein a detection impedance connected to a measuring instrument for measuring a partial discharge is connected between metal sheaths on both sides of an insulation cylinder of the insulation connection portion, A calibration pulse generator is connected in parallel to the detection impedance, and the measurement instrument is calibrated by a calibration pulse output from the calibration pulse generator, and a potential difference generated across the detection impedance based on a high frequency pulse is measured by the measurement instrument. A method for measuring partial discharge, characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32276988A JPH067147B2 (en) | 1988-12-21 | 1988-12-21 | Partial discharge measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32276988A JPH067147B2 (en) | 1988-12-21 | 1988-12-21 | Partial discharge measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02167483A JPH02167483A (en) | 1990-06-27 |
| JPH067147B2 true JPH067147B2 (en) | 1994-01-26 |
Family
ID=18147440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32276988A Expired - Lifetime JPH067147B2 (en) | 1988-12-21 | 1988-12-21 | Partial discharge measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067147B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6210564B2 (en) * | 2015-06-18 | 2017-10-11 | 古河電気工業株式会社 | Power cable connection protective tube and partial discharge measuring device |
-
1988
- 1988-12-21 JP JP32276988A patent/JPH067147B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02167483A (en) | 1990-06-27 |
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