JPH0376431B2 - - Google Patents
Info
- Publication number
- JPH0376431B2 JPH0376431B2 JP58076885A JP7688583A JPH0376431B2 JP H0376431 B2 JPH0376431 B2 JP H0376431B2 JP 58076885 A JP58076885 A JP 58076885A JP 7688583 A JP7688583 A JP 7688583A JP H0376431 B2 JPH0376431 B2 JP H0376431B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- water
- cables
- insulation
- component
- 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
- 240000005572 Syzygium cordatum Species 0.000 claims description 35
- 235000006650 Syzygium cordatum Nutrition 0.000 claims description 35
- 238000009413 insulation Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 9
- 230000006866 deterioration Effects 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Description
【発明の詳細な説明】
本発明は、ゴム・プラスチツク絶縁電力ケーブ
ル、主として架橋ポリエチレン絶縁電力ケーブル
（CVケーブル）の絶縁劣化診断法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for diagnosing insulation deterioration of rubber/plastic insulated power cables, primarily cross-linked polyethylene insulated power cables (CV cables).
CVケーブルの絶縁劣化は、主として水トリー
によることが明らかとなつている。したがつて、
CVケーブルの絶縁劣化による絶縁破壊事故を未
然に防ぐには、この水トリーの発生を知ることが
重要である。 It has become clear that the insulation deterioration of CV cables is mainly caused by water trees. Therefore,
In order to prevent insulation breakdown accidents due to insulation deterioration in CV cables, it is important to know when this water tree occurs.
従来、この水トリーの検知手段としては、いわ
ゆる停止線路から採取したケーブル、すなわち絶
縁破壊事故が起つたケーブル、あるいは充電を停
止して絶縁診断して要注意となつたケーブルから
ケーブル絶縁体の一部を採取し、煮沸あるいは染
色して目視あるいは光学顕微鏡下で観察して始め
て水トリーの存在を確認できる方法と、最近報告
された停止線路に直流電圧を印加し、印加停止後
ケーブルに蓄積された電荷を測定し、水トリーの
発生を予想する方法の２つがある。しかしなが
ら、両者とも線路停止後に水トリーを検知するも
のであり、活線路の水トリーによる絶縁破壊事故
を確実に防ぐことはできなかつた。 Conventionally, this water tree detection method has been to collect cables taken from so-called stopped lines, that is, cables where an insulation breakdown accident has occurred, or cables that require attention after stopping charging and conducting an insulation diagnosis. There is a method in which the presence of water trees can be confirmed only by collecting water trees, boiling or staining them, and observing them visually or under an optical microscope, and a recently reported method in which a DC voltage is applied to a stopped line, and after the application is stopped, the water trees accumulate in the cable. There are two methods to predict the occurrence of water tree by measuring the electric charge generated by the water tree. However, both methods detect water trees after the line has stopped, and cannot reliably prevent insulation breakdown accidents caused by water trees on live lines.
本発明の目的は、前記した従来技術の欠点を解
消し、活線状態（あるいは停止状態）の電力ケー
ブルに発生した水トリーを検知し、電力ケーブル
の水トリーによる絶縁破壊事故を未然に防ぐこと
のできる新規な方法を提供することにある。 The purpose of the present invention is to eliminate the drawbacks of the prior art described above, detect water trees occurring in live (or stopped) power cables, and prevent insulation breakdown accidents due to water trees in power cables. The objective is to provide a new method that allows for
すなわち、本発明の要旨は、活線路で絶縁劣化
診断の対象とする電力ケーブル（あるいは停止及
び撤去ケーブル）の接地線を流れる充電電流の中
から直流電流成分（以下、直流成分と称する）を
検出して、その極性、大きさを解析し、水トリー
の有無大きさ及び発生方向を検出し、上記ケーブ
ルの使用継続の可否を判定することにある。 That is, the gist of the present invention is to detect a direct current component (hereinafter referred to as a direct current component) from the charging current flowing through the grounding wire of a power cable (or a stop and removal cable) that is the target of insulation deterioration diagnosis on a live line. The purpose is to analyze the polarity and size of water trees, detect the presence, size and direction of occurrence of water trees, and determine whether or not the cable can be continued to be used.
ところで本発明者らは、水トリー現象について
研究している過程での次新しい事実を発見した。 By the way, the present inventors discovered the following new fact in the process of researching the water tree phenomenon.
研究に用いたケーブルは、6KV、100mm2、150
mm2、250mm2及び400mm2CVケーブルで、正常ケーブ
ル４試料と強制劣化させたケーブル100試料であ
る。 The cable used in the research is 6KV, 100mm 2 , 150
mm 2 , 250 mm 2 and 400 mm 2 CV cables, 4 samples of normal cables and 100 samples of forcedly degraded cables.
これらの試料に6KV級CVケーブルの使用電圧
である交流3.8KVをケーブルの導体側から印加
し、ケーブル遮へい層側から直流成分を測定し、
同一試料で交流破壊試験を行なつた後、水トリー
の観察を行なつた。なお、ケーブル有効長は各試
料とも10ｍである。観察された水トリーのケーブ
ル絶縁体に占める体積（％）と１m3当りの直流成
分（導体サイズが異なるため１m3当りで換算）と
の関係を第１図に示す。なお、図中イはケーブル
の内部半導電層側より発生する水トリー、いわゆ
る内導水トリー、ロはケーブルの外部半導電層側
より発生する水トリー、いわゆる外導水トリーの
場合を示す線である。これより直流成分の絶対値
の大きいケーブルほど発生している水トリーの絶
縁体に占める体積が大きいことがわかる。 AC 3.8KV, which is the working voltage of 6KV class CV cable, was applied to these samples from the conductor side of the cable, and the DC component was measured from the cable shielding layer side.
After conducting an AC destructive test on the same sample, water trees were observed. The effective length of the cable is 10 m for each sample. Figure 1 shows the relationship between the observed volume (%) of the water tree in the cable insulation and the DC component per 1 m 3 (converted to 1 m 3 because the conductor size is different). In the figure, A indicates a water tree generated from the internal semiconductive layer side of the cable, a so-called inner water conduction tree, and B indicates a water tree generated from the external semiconductive layer side of the cable, a so-called external water conduction tree. . From this, it can be seen that the larger the absolute value of the DC component in a cable, the larger the volume occupied by the insulation of the generated water trees.
第２図は、水トリーがケーブル絶縁体に占める
体積と内・外導水トリーの最大長の関係を示す結
果である。この結果より、水トリーがケーブル絶
縁体に占める体積が大きいほど水トリーの最大長
が大きいことがわかる。 FIG. 2 shows the relationship between the volume occupied by the water tree in the cable insulation and the maximum length of the inner and outer water guiding trees. From this result, it can be seen that the larger the volume occupied by the water tree in the cable insulator, the larger the maximum length of the water tree.
また、第３図は、ケーブルの交流破壊電圧と１
m3当りの直流成分の絶対値の関係を示したもので
ある。この結果から、直流成分の大きいケーブル
ほど交流電圧に対する絶縁破壊強度が低下してい
ることがわかる。 In addition, Figure 3 shows the AC breakdown voltage of the cable and 1
This shows the relationship between the absolute value of the DC component per m3 . From this result, it can be seen that the cable with a larger DC component has a lower dielectric breakdown strength against AC voltage.
上述したことにより、次のことが言える。 Based on the above, the following can be said.
(1) 直流成分の発生は、水トリーの発生に起因
し、内導水トリーが発生した場合は負極性、外
導水トリーが発生した場合は正極性の直流成分
が発生する。(1) The generation of a DC component is due to the generation of water trees; when an internal water tree occurs, a negative polarity DC component is generated, and when an external water tree occurs, a positive polarity DC component is generated.
(2) 直流成分の絶対値が大きいほど、水トリーが
ケーブル絶縁体に占める体積が大きい。(2) The larger the absolute value of the DC component, the larger the volume occupied by the water tree in the cable insulation.
(3) 直流成分の絶対値が大きいほど、長い水トリ
ーが発生している。(3) The larger the absolute value of the DC component, the longer the water tree is generated.
以上のことから、直流成分の極性及び大きさを
検出することにより、ケーブル中の水トリーの有
無、大きさ及び発生方向を知ることができ、ケー
ブルの運転中の絶縁破壊事故を未然に防ぐことが
できる。 From the above, by detecting the polarity and magnitude of the DC component, it is possible to know the presence, size, and direction of occurrence of water trees in the cable, thereby preventing dielectric breakdown accidents during cable operation. I can do it.
次に、第４図及び第５図により本発明の実施例
を説明する。 Next, an embodiment of the present invention will be described with reference to FIGS. 4 and 5.
第４図は、３心一括のCVケーブルを対象とす
る場合、第５図は単心形のCVケーブルを対象と
する場合の実施例である。図中１は電源変圧器、
２は高電圧母線、３は接地用変圧器、４，４′は
被測定CVケーブル、５，５′はケーブルの金属遮
へい層から引き出された接地線である。６は直流
成分測定装置であり、波回路、増巾回路、演算
回路、表示装置を有している。 FIG. 4 shows an example in which a three-core CV cable is used, and FIG. 5 shows an example in which a single-core CV cable is used. 1 in the diagram is the power transformer,
2 is a high voltage bus bar, 3 is a grounding transformer, 4 and 4' are CV cables to be measured, and 5 and 5' are grounding wires drawn out from the metal shielding layer of the cable. 6 is a DC component measuring device, which includes a wave circuit, an amplification circuit, an arithmetic circuit, and a display device.
以上の本実施例は、交流電圧を印加したCVケ
ーブルの金属遮へい層側から接地線電流のうちの
直流成分を検出して、水トリーの有無、大きさ、
発生方向を検知するものであることから、活線状
態のケーブルはもちろんのこと、所定の交流電圧
を印加することにより停止線路のケーブル及び撤
去ケーブルの水トリー検知にも適用できる。 This embodiment described above detects the DC component of the ground line current from the metal shielding layer side of the CV cable to which an AC voltage is applied, and determines the presence/absence and size of the water tree.
Since it detects the direction of generation, it can be applied not only to live cables, but also to water tree detection of stopped track cables and removed cables by applying a predetermined AC voltage.
以上のように、本発明によれば、電力ケーブル
の水トリーの発生状況を検出することにより、ケ
ーブルの絶縁劣化状態を正確に知ることができ、
従つてケーブルの破壊事故を、延いては停電事故
を未然に防ぐことができ、電力需要家への損害の
大巾な低減をはかることができる。 As described above, according to the present invention, by detecting the occurrence of water trees in power cables, it is possible to accurately know the insulation deterioration state of the cables.
Therefore, it is possible to prevent cable breakage accidents and, by extension, power outage accidents, and to significantly reduce damage to power consumers.
第１図はケーブル絶縁体１m3当りの直流成分と
水トリーが絶縁体に占める体積との関係を示す
図、第２図は内・外導水トリーの最大長と水トリ
ーがケーブル絶縁体に占める体積の関係を示す
図、第３図はケーブル絶縁体１m3当りの直流成分
の絶対値とケーブルの交流破壊電圧の関係を示す
図、第４図及び第５図は本発明の実施例説明図で
ある。
（１：電源変圧器）、（２：高電圧母線）、（３：
接地用変圧器）、（４，４′：被測定CVケーブル）、
（５，５′：接地線）、（６：直流成分測定装置）。
Figure 1 shows the relationship between the direct current component per 1m3 of cable insulation and the volume occupied by the water tree in the cable insulation, and Figure 2 shows the maximum length of the inner and outer water guiding trees and the volume occupied by the water tree in the cable insulation. FIG. 3 is a diagram showing the relationship between the absolute value of the DC component per 1 m 3 of cable insulation and the AC breakdown voltage of the cable. FIGS. 4 and 5 are explanatory diagrams of embodiments of the present invention. It is. (1: Power transformer), (2: High voltage bus), (3:
(grounding transformer), (4, 4': CV cable to be measured),
(5, 5': grounding wire), (6: DC component measuring device).
Claims (1)
加し、その接地線電流のうち直流電流成分を検出
して、その極性、大きさを解析し、もつてケーブ
ル絶縁体中の水トリーの有無、大きさ、発生方向
を検知して、上記ケーブルの使用継続の可否を判
定することを特徴とする電力ケーブルの絶縁劣化
診断法。1. Apply an AC voltage to the power cable to be measured, detect the DC current component of the ground wire current, analyze its polarity and magnitude, and determine the presence or absence and magnitude of water trees in the cable insulation. A method for diagnosing insulation deterioration of a power cable, the method comprising: detecting the direction in which the cable is generated and determining whether or not the cable can be continued to be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58076885A JPS59202075A (en) | 1983-04-30 | 1983-04-30 | Diagnosis of insulation deterioration of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58076885A JPS59202075A (en) | 1983-04-30 | 1983-04-30 | Diagnosis of insulation deterioration of power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59202075A JPS59202075A (en) | 1984-11-15 |
| JPH0376431B2 true JPH0376431B2 (en) | 1991-12-05 |
Family
ID=13618087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58076885A Granted JPS59202075A (en) | 1983-04-30 | 1983-04-30 | Diagnosis of insulation deterioration of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59202075A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0726985B2 (en) * | 1988-02-22 | 1995-03-29 | 日立電線株式会社 | Insulation deterioration diagnosis method for power cables |
| JP2612648B2 (en) * | 1991-05-31 | 1997-05-21 | 東京電力株式会社 | Deterioration judgment method for insulation of three-phase power cable |
| CN112557842B (en) * | 2020-11-24 | 2021-09-21 | 西南交通大学 | XLPE cable aging state evaluation method based on dielectric constant evaluation factor |
-
1983
- 1983-04-30 JP JP58076885A patent/JPS59202075A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59202075A (en) | 1984-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109917235B (en) | A kind of cable buffer layer conductivity defect detection method | |
| CN110954471B (en) | Electrochemical corrosion off-line detection and evaluation method for water-blocking buffer layer of high-voltage power cable | |
| JPS61243375A (en) | Deterioration diagnosis for insulator of power cable | |
| Lai et al. | Investigation of tail pipe breakdown incident for 110 kV cable termination and proposal of fault prevention | |
| CN203299337U (en) | High voltage XLPE cable insulation on-line monitoring device | |
| CN202549463U (en) | 27.5kV single-phase cable for intelligent electrified railway | |
| JPH0376431B2 (en) | ||
| JPH0619416B2 (en) | Insulation diagnosis method | |
| JPH0429982B2 (en) | ||
| CN214201656U (en) | An on-line insulation detection device for sheathed high-voltage cables | |
| JPS59202073A (en) | Diagnosis method for insulation deterioration of power cables | |
| Wang et al. | Fault location in the outer sheath of power cables | |
| JPS60216276A (en) | Diagnosis method for insulation deterioration of power cables | |
| Bahder et al. | In service evaluation of polyethylene and crosslinked polyethylene insulated power cables rated 15 to 35 kV | |
| CN112710935B (en) | Power wire and cable protective layer ablation condition pre-alarming system and method | |
| Zhang et al. | Analysis and Treatment of the Cause of Heating of Single-core XLPE Cable GIS Terminal | |
| JP4681391B2 (en) | Degradation diagnosis method for low-voltage cables | |
| JPH0378588B2 (en) | ||
| CN121208547A (en) | A method, device and system for online monitoring of the insulation of the outer sheath of high-voltage cables. | |
| JPH0425504B2 (en) | ||
| CN119936641A (en) | Insulation and conductivity performance test connection device and test method for insulating circuit breaker | |
| JPH04242176A (en) | Diagnosis method for power cable insulation deterioration | |
| JPH0614094B2 (en) | Insulation deterioration diagnosis method for power cables | |
| Duan et al. | The fault analysis and on-line monitoring technique for XLPE power cables | |
| JPH08304487A (en) | Insulation diagnosis method for live cable sheath |