JPS5870173A - Orientating method for degradation position of power cable - Google Patents

Orientating method for degradation position of power cable

Info

Publication number
JPS5870173A
JPS5870173A JP57097376A JP9737682A JPS5870173A JP S5870173 A JPS5870173 A JP S5870173A JP 57097376 A JP57097376 A JP 57097376A JP 9737682 A JP9737682 A JP 9737682A JP S5870173 A JPS5870173 A JP S5870173A
Authority
JP
Japan
Prior art keywords
cable
resistance
shielding layer
current
power cable
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.)
Granted
Application number
JP57097376A
Other languages
Japanese (ja)
Other versions
JPS5851227B2 (en
Inventor
Mitsugi Aihara
海老沼康光
Yasumitsu Ebinuma
相原貢
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 JP57097376A priority Critical patent/JPS5851227B2/en
Publication of JPS5870173A publication Critical patent/JPS5870173A/en
Publication of JPS5851227B2 publication Critical patent/JPS5851227B2/en
Expired legal-status Critical Current

Links

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
    • G01R31/08—Locating faults in cables, transmission lines, or networks

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gas Or Oil Filled Cable Accessories (AREA)
  • Locating Faults (AREA)

Abstract

PURPOSE:To estimate the degradation position of a power cable, by obtaining the resistance of a cable shielding layer between the cable degradation position and the other end of the cable. CONSTITUTION:A DC high voltage Hv is applied between a conductor 1 of one end E1 of a power cable and a grounded shielding layer 2, and the leakage current from a degradation position X is read on the first ammeter A1. In this case, switches S1 and S2 are opened and a variable DC power source E0 is set to zero for the purpose of stopping the shunt of the leakage current. Then, the switch S1 is closed, the variable DC power source E0 is regulated, and the deflection of the ammeter A1 is set to zero. Since a current is not flowed to a shielding resistance R1 of a section from one end E1 of the power cable to the position X when this circuit is balanced, a shielding resistance R2 of a section from the position X to the other end E2 is obtained. When the DC high voltage Hv is not applied, switches S1 and S2 are closed to read values on an ammeter A2 and a voltmeter V1, and a resistance R1+R2 of the shielding layer of the overall length of the cable is calculated, and the position X is estimated on a basis of the ratio of the overall resistance R1+R2 to the shielding resistance R2 of the section from the position X to the other end E2.

Description

【発明の詳細な説明】 本発明は電カケープルの劣化位置標定法に係る。[Detailed description of the invention] The present invention relates to a method for locating the deteriorated position of a power cable.

一般に電カケープルの絶縁診断は、ケ、−プルの導体と
大地間またはしゃへい層間に直流高電圧を印加し、ケー
ブル絶縁体中を流れる漏れ電流を測定することによって
行なわれている。In general, insulation diagnosis of power cables is performed by applying a DC high voltage between the cable and pull conductors and the ground or shielding layer, and measuring the leakage current flowing through the cable insulation.

しかるに１　このような絶縁診断では、劣化して−るこ
とが判断できてもケーブルの劣化位置が不明てあり、従
ってこれを修復する場合には、ケーブル全長を取９替え
ねばならぬ不都合がある。However, in this type of insulation diagnosis, even if it is determined that there is deterioration, the location of the deterioration in the cable is unknown, and therefore, in order to repair it, the entire length of the cable must be replaced. .

また、従前においては、直流漏れ電流を利用してケーブ
ルの劣化位置を標定する技術も未だ開示されていない。Further, no technology has been disclosed so far to locate the deteriorated position of a cable using DC leakage current.

本発明はこのような点に着目してなされたもので、ケー
ブル劣化位置とケーブル他端間（お轄るケーブルしゃへ
い層の抵抗を求めることにより電カケープルの劣化位置
を標定せんとするものである。The present invention has been made with attention to these points, and aims to locate the deteriorated position of the power cable by determining the resistance of the cable shielding layer between the deteriorated position of the cable and the other end of the cable. .

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.

図ＩＩＣおいて、まず電カケープルの一端（１１）Ｋ−
これの導体１と接地されたし中へｖｈＪＩ２間に直流高
電圧（ＨＶ）を印加し、劣化位置（）［）　　点からの
漏れ電ＩＩｔ第１電流針（ム１）により読みとる。In Figure IIC, first, one end of the power cable (11) K-
A DC high voltage (HV) is applied between the conductor 1 and the grounded VHJI2, and the leakage current from the deterioration position () [) is read by the first current needle (M1).

こＯ場合、漏れ電流Ｏ分Ｉｌｔ阻止するため、スイッチ
（Ｓｌ）、（８ｍ）ｔｌｌ放し、可変直流電源（］Ｃｏ
）を零状態にしておく。。In this case, in order to block the leakage current Ilt, release the switch (Sl), (8m) tll, and turn on the variable DC power supply (]Co
) is set to zero. .

次にスイッチ（８ｓ）　ｔｌｌｇじて可変直流電源（Ｂ
・）【調節し、ｇｉ電概計（Ａｔｔｏ振れが零Ｋするよ
うにする。しかしてこのｍ１ｌｌＯ平衡がとれれ＃ｆＥ
１〜Ｘ区間のし中へｉ抵抗（Ｒｔ）Ｋｍ流が流れ１に−
のでＸ　＝　Ｋ　雪　区間のし中へい抵抗（Ｒｔ）を次
式により求めることができる。Next, turn on the switch (8s) and the variable DC power supply (B
・) [Adjust so that the gi electric meter (Atto deflection is zero K.) Then, this m1llO balance is achieved.#fE
i resistance (Rt) Km flow flows into 1-X section -
Therefore, the insulating resistance (Rt) of the X = K snow section can be calculated using the following formula.

すなわち、Ｅ１〜Ｅ寓区間に接続した電圧針（ｖｌ）の
読みｔ　（Ｖ）　、Ｘ＝Ｅ雪　区間のし中へ％Ａ低抵抗
８章）ＫＩＥれる電１１ｔ（Ｉ）とすれば、として算出
できる。In other words, if the reading of the voltage needle (vl) connected to the E1-E section is t (V), It can be calculated.

一方、これと性別に直流高電圧（ＨＶ）が印加されてい
ない場合に、スイッチ（Ｓｌ）、（Ｓり　１’閉じてお
けば第２電流計（Ａｍ）と電圧針（Ｖｌ）（Ｄ読みから
、ケーブル全長にわたるし中へ一層の抵抗（］Ｌ＋Ｒ鵞
）を算出でき、もってＸ　−Ｎ　＊区間におけるし中へ
い抵抗（Ｒｔ）、と全抵抗（Ｒｔ　＋Ｒ鵞）との比から
Ｘ点の位置ｔ−推定することができる。On the other hand, if DC high voltage (HV) is not applied to this and sex, if the switch (Sl) and (S 1' are closed), the second ammeter (Am) and the voltage needle (Vl) (D reading) From this, we can calculate the further resistance (]L + R) over the entire length of the cable, and from the ratio of the resistance (Rt) to the total resistance (Rt + R) in the section X - N *, we can calculate the The position t-can be estimated.

上述したように、本発明において・は、ケーブル他端か
らケーブル劣化位置点までの抵抗を求めることにより、
従来、標定し得な゛かったケーブルの劣化位置点を簡単
に推定できる。As mentioned above, in the present invention, by determining the resistance from the other end of the cable to the cable deterioration point,
It is now possible to easily estimate the location of cable deterioration, which could not be located in the past.

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

図ＷＪ線木本発明お社る電カケープルの劣化位置標定法
を示す説明図である。 １−−−−−一・・・・−導体 ２・・−−−−−−−Ｌやへい層 （Ｉｃ＜）　、　（Ｅ雪）・・・・・ケーブル端部＜ｘ
＞・・−・・・・−・・・・−・劣化位置（Ｒ１）、（
Ｒ曽）・・−・・しやへい抵抗ＣＩ’１．Ｖ）−直流高
電圧電源 （Ｉｏ）−・・−・・−可変直流電源Figure WJ line tree is an explanatory diagram showing a method for locating the deteriorated position of a power cable, which is a method of the present invention. 1------1...-Conductor 2...-----L layer (Ic<), (E snow)...Cable end <x
>・・・・・・・・・Deterioration position (R1), (
Rso)...Shiyahei resistance CI'1. V) - DC high voltage power supply (Io) - - Variable DC power supply

Claims (1)

【特許請求の範囲】[Claims] １、ケープル一端の導体と大地間に直流高圧電Ｉ［を接
続し、これによって前記ケーブルの劣化位置の絶縁体中
を流れる電流ｔ１前記ケーブル一端のケーブルしゃへい
層と大地間ＫＩＩ続した第１電流計で測定し、次に前記
ケーブル他端のケーブルしゃへい層と大地間に第２電流
針を介して接続した可変直流電源ｔＩ１１節して前記第
１電流針の振れが零になるようにし、この状態における
前記第２電流針および前記ケーブルしゃへい層の両端に
１［Ｉ＄５！した電圧針のそれぞれの読取値から、前記
ケーブルの劣化位置から前記ケーブル他端にわたるケー
ブルしゃへい層の抵抗を求め、この求められた抵抗と、
前記ケーブルの全長にわ几るケーブルしゃへい層の抵抗
との比から前記ケーブル劣化位置を標定することｔ−特
徴とする市カケープルの劣化位置標定法。1. A DC high-voltage electric current I is connected between the conductor at one end of the cable and the ground, so that a current t1 flows through the insulator at the deteriorated position of the cable. A first current connected between the cable shielding layer at one end of the cable and the ground. Then, connect the variable DC power supply tI11 between the cable shielding layer at the other end of the cable and the ground via the second current needle so that the deflection of the first current needle becomes zero, and then 1[I$5!] at both ends of the second current needle and the cable shielding layer in the state. The resistance of the cable shielding layer extending from the deteriorated position of the cable to the other end of the cable is determined from each reading of the voltage needle, and this determined resistance and
A method for locating a deterioration position of a city cable, characterized in that the deterioration position of the cable is located from a ratio with the resistance of a cable shielding layer extending over the entire length of the cable.
JP57097376A 1982-06-07 1982-06-07 Deterioration location location method for power cables Expired JPS5851227B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57097376A JPS5851227B2 (en) 1982-06-07 1982-06-07 Deterioration location location method for power cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57097376A JPS5851227B2 (en) 1982-06-07 1982-06-07 Deterioration location location method for power cables

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP14039777A Division JPS5472486A (en) 1977-11-22 1977-11-22 Method of orientating deteriorated location of power cable

Publications (2)

Publication Number Publication Date
JPS5870173A true JPS5870173A (en) 1983-04-26
JPS5851227B2 JPS5851227B2 (en) 1983-11-15

Family

ID=14190789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57097376A Expired JPS5851227B2 (en) 1982-06-07 1982-06-07 Deterioration location location method for power cables

Country Status (1)

Country Link
JP (1) JPS5851227B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6382374A (en) * 1986-09-26 1988-04-13 Hitachi Cable Ltd Detection of insulation defect in power cable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373634U (en) * 1986-11-04 1988-05-17

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6382374A (en) * 1986-09-26 1988-04-13 Hitachi Cable Ltd Detection of insulation defect in power cable

Also Published As

Publication number Publication date
JPS5851227B2 (en) 1983-11-15

Similar Documents

Publication Publication Date Title
Sebo Zero-sequence current distribution along transmission lines
JPS5870173A (en) Orientating method for degradation position of power cable
JPS60262069A (en) Monitoring of deterioration in insulation of power cable
CN107064643A (en) 1000 kilovolts of GIS device major loop method for testing resistance
JP3010367B2 (en) Insulation resistance measurement method of cable sheath under hot wire
JP3288836B2 (en) Electric resistance measuring method and electric resistance measuring device
CN115290984A (en) Equivalent resistance measuring and calculating method for subway steel rail potential limiting device
JP2850463B2 (en) Power cable deterioration diagnosis method
JPH03180771A (en) Measurement of grounding resistance
JP2003057288A (en) Fault-point specifying method for branch cable line
SU813326A1 (en) Method of locating sheath faults in cable lines
SU711497A1 (en) Method of testing insulation in circuits with earthed neutral wire under operating voltage and load
SU449307A1 (en) Method of compensation of induced noise when testing cables
DE855128C (en) Process for temperature monitoring of electrical cables
US647970A (en) Apparatus for indicating leakage of current from electric conductors.
JPS60195462A (en) Insulating layer deteriorated position detecting method of cable for high voltage and extra-high voltage
Malewski et al. Behavior of the Hydro-Quebec 735-kV system under transient short-circuit conditions and its digital computer simulation
US1865687A (en) Method of locating the fault in the case of multiconductor cables damaged by short-circuiting
JPS60169774A (en) Locating method of insulating failure point of cable under live state
SU708264A1 (en) Arrangement for determining earthings in operational dc circuits
JPH06167529A (en) Cross-connection/discontinuity position detector
JPH1078472A (en) Method for diagnosing deterioration of cv cable
JPS63281074A (en) Detecting method for water tree current of cv cable
JPS5925469B2 (en) Method for detecting the location of electrical insulation layer defects within a limited area
JPH034940Y2 (en)