CN102520316A - Method for quickly and accurately positioning fault point of cable - Google Patents
Method for quickly and accurately positioning fault point of cable Download PDFInfo
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- CN102520316A CN102520316A CN2011104204945A CN201110420494A CN102520316A CN 102520316 A CN102520316 A CN 102520316A CN 2011104204945 A CN2011104204945 A CN 2011104204945A CN 201110420494 A CN201110420494 A CN 201110420494A CN 102520316 A CN102520316 A CN 102520316A
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Abstract
The invention discloses a method for accurately positioning a fault point in the premise that the total length of a faulty cable is known. The method comprises the following steps of: determining a detection point, and using a digital insulation resistance tester to determine direct-current resistance of faulty line cores, direct-current resistance among the faulty line cores and direct-current resistance between each faulty line core and a shielded steel belt; according to the direct-current resistance, determining a corresponding measuring method to determine the range of the fault point; and using a cable fault positioning power supply to further determine the accurate position of the fault point in the range of the fault point. According to the method discloses by the invention, a step-by-step style is used to accurately position the fault point, and used equipment is the current equipment which does not need to be additionally processed and assembled. The method overcomes the technical defects of high cost and poor reliability in the prior art, so that rapid positioning can be realized.
Description
Technical field
The invention belongs to the disposal route that relates to cable fault, especially under the known prerequisite of failure cable total length, pinpoint method is carried out in the trouble spot.
Background technology
The quick protection of transmission line malfunction and accurate location can not get solving preferably for a long time, directly influence the service restoration time of faulty line, have brought white elephant also for circuit operation maintenance personnel.
Authors such as Dong Xinzhou are at Proceedings of the CSEE; 1999; A kind of method that adopts current traveling wave to carry out localization of fault introduced in 19 (4) " utilizing the outlet line Research on fault locating of transient current travelling waves " literary composition, and the transient state travelling wave signal by high-speed a/d acquisition system record trouble produces utilizes wavelet analysis to carry out signal Processing by computing machine; Search capable wave-wave head, according to the Time Calculation fault distance of current traveling wave wave head arrival.This method needs complicated hardware and software design, and cost is high, poor reliability, and is not suitable for installing at the one-end substation that has only an outlet.
Application number 93243667 " novel cable fault locating instrument " by name thus utility model patent disclose a kind of employing by transformer station's injected pulse signal, measure the method that initialize signal and the mistiming calculating position of failure point of trouble spot reflected signal carry out localization of fault; This method needs complicated signal injection device; Cost is high, poor reliability.
97108539 of application numbers are called " high-voltage overhead line on-line failure distance finding method and apparatus " application for a patent for invention and disclose a kind of power frequency measurement amount line reactance value of utilizing; Calculate the method for fault distance by reactance value; This method receives the influence of factors such as line parameter circuit value variation, current transformer and voltage transformer error, and the localization of fault precision is not high.
Summary of the invention
Technical matters to be solved by this invention provide a kind of to Method of Cable Trouble Point accurately locate, the method for good reliability.
In order to solve the problems of the technologies described above, the present invention provides following technical scheme:
The pinpoint method of Method of Cable Trouble Point, wherein the total length of failure cable is a given data, comprises the steps:
A) remove load on the failure cable, with the two ends core separately, and unsettled, with said failure cable wherein the position of an end as check point;
B) measure between said each core that separates with Digital Measuring Instrument for Insulation Resistance, and insulation resistance between each core and shielding steel band, thereby confirm the fault core, promptly belong to the core of fault; And then measure between the fault core and each fault core and the direct current resistance that shields between steel band;
The direct current resistance that records all is less than or equal to 1 k Ω's, and adopt cable fault location electric bridge and wave reflection cable fault locator to measure arbitrary fault core respectively and come the cable length value between the localization of faults and the check point, thus localization of faults position; The position of failure point that stream oriented device is measured differs by more than tolerance distance, be as the criterion with the test result of wave reflection cable fault locator this moment, differs to be less than or equal to tolerance distance, and the scope between the position of failure point that stream oriented device is measured is confirmed as the trouble spot scope;
The direct current resistance that records is all greater than 1k Ω's; Use the wave reflection cable fault locator to measure arbitrary fault core and come the cable length value between the localization of faults and the check point, thus localization of faults position, and be the center of circle with this position of failure point; Tolerance distance is a radius, localization of faults scope;
Record direct current resistance not of uniform size; Use the wave reflection cable fault locator to measure arbitrary fault electricity core and come the cable length value between the localization of faults and the check point, thus localization of faults position, and be the center of circle with this position of failure point; Tolerance distance is a radius, localization of faults scope; (this is accurate with the result that the location electric bridge records owing to resistance is little, but the direct current resistance is big or small, to measure not influence with wave reflection)
Above-mentioned tolerance distance is 5m;
C) between the check point position is to the fault core or between fault core and steel band, apply pulse voltage with cable localization of fault power supply; (puncture of trouble spot meeting this moment generating period property produces sound and magnetic field)
Put accurate position or use type cable failure positioning instrument according to sound judgement trouble-shooting in the trouble spot scope of in step b), confirming, in the trouble spot scope of in step b), confirming,, search the accurate position of Method of Cable Trouble Point with sound magnetic-synchro method.(if the shallow embedding cable, environmental noise is little, and the supervisory personnel judges trouble-shooting point position to the trouble spot scope in the step b) according to sound; If buried cable then uses type cable failure positioning instrument, in the trouble spot scope in step b),, search the Method of Cable Trouble Point position with sound magnetic-synchro method.）
Embodiment
YJV22 4 * 150+1 * 95mm of certain colleges and universities
2Power cable, 273 meters of length, about 1 year of utilization and operation, short circuit between wherein red, yellow line core, the steel band three.The site inspection situation, this cable adopts the electrical plastics pipe of diameter 100, and buried underground about 1 meter, wherein one section across highway.
Search the trouble spot:
The first step is removed the load on these cable two ends, with each core of two ends separately, and unsettled; After a definite end is check point (end), the other end is carried out necessary security handle, when avoiding high-potting, meet accident, best bet is that when carrying out high-potting, the other end sends someone to guard.
In second step, it is almost nil to measure between red, yellow line core, the steel band three insulation resistance with Digital Measuring Instrument for Insulation Resistance, so can judge red, the equal short circuit of yellow line core, is the fault core; Direct current resistance between red, the yellow line core is 250 Ω, and the direct current resistance between red, yellow line core and the steel band all is 300 Ω;
The 3rd step, measure red core with the wave reflection cable fault locator, set velocity of wave 185 meter per seconds, 500 meters of measurement ranges record the trouble spot apart from 35 meters of check point (end).With the bridge measurement of cable localization of fault, record the trouble spot apart from 40 meters of check point (end).Infer the trouble spot scope apart between 35 meters～40 meters of check points (end);
In the 4th step, at check point (end), high-pressure stage is received red core with cable localization of fault power supply, and the low pressure utmost point is received on the steel band, applies recurrent pulses voltage.Since buried, only can not hear discharging sound with people's ear;
The 5th step, continue to apply recurrent pulses voltage, with type cable failure positioning instrument in the scope of inferring, employing instrument sound magnetic-synchro method function, the localization of faults is apart from 37 meters of check point (end), the edge of highway.
It is consuming time not above 2 hours to have suffered testing process.Dig out cable, it is accurate to find position of failure point, and analyzing failure cause is that construction wrong causes.Adopt this method, repeatedly accurately find Method of Cable Trouble Point, the most once be no more than 30 minutes.
As specific embodiment of the present invention, in the above-mentioned instrument
(1), Digital Measuring Instrument for Insulation Resistance
Key parameter: maximum magnitude 10G/1000V;
Function: the contact resistance and each insulation resistance mutually of measuring failure cable;
(2), cable fault location power supply
Key parameter: output voltage: 0～15kV DC voltage is adjustable continuously, maximum output current 100mA, discharge capacity be greater than 4uF;
Function: produce the macro-energy pulse, cooperate type cable failure positioning instrument, accomplish the accurate location of breakdown point; Have the powerful ability of burning, can burn the trouble spot, reduce trouble spot resistance; Can be used for DC voltage withstand test
(3), wave reflection cable fault locator
Key parameter:
Test specification: 1～4km,
Test blind area: 1m,
Wave velocity range of adjustment: 100～300m/ μ s.
Function:
During test, inject an action of low-voltage pulse to cable, the pulse edge cable propagates into impedance and do not match a little, and is first-class like short dot, trouble spot, indirect, and pulse produces reflection, is transmitted back to measurement point by under the instrument record.Can measure the position of all kinds trouble spots such as broken string, swinging cross, defective insulation.
(4), cable fault location electric bridge
Key parameter:
Direct current output: 0～5kV
Short-circuit current: 50mA
Location proportional precision: ± (0.2%L+1) m
Function:
Design according to the MURRAY electrical bridge principle, be used to lay the breakdown point of the various electric wires in back and not have puncture but the location of insulating resistance value defect point on the low side.
(5), type cable failure positioning instrument
Key parameter:
Sound magnetic measurement method station accuracy: 10% of cable depth;
Path bearing accuracy: 10% of cable depth;
Magnetic-field measurement method station accuracy: 50% of cable depth;
Step voltage method station accuracy: 10cm;
Function:
1, with acoustic measurement method or sound magnetic-synchro method to cable high resistive fault point pinpoint
High-voltage pulse discharges in the trouble spot, produces sound and magnetic field.Usually can recognize position of failure point through high sensor and earphone.When sound variation intensity was not obvious, relatively the transmission time difference in sound wave and magnetic field fixed a point more accurately to make things convenient for.
2, carry out cable metal property fault (dead ground connection) pinpoint with the magnetic-field measurement method
The metallicity fault does not have tangible discharging sound during puncture, be difficult to use the sound detection pinpoint.Type cable failure positioning instrument patrols and surveys near the Distribution of Magnetic Field in trouble spot, thus pinpoint.
Above-described only is preferred implementation of the present invention; Should be pointed out that for a person skilled in the art, under the prerequisite that does not break away from structure of the present invention; In the face of actual conditions; Can also make some distortion and improvement, these also should be regarded as protection scope of the present invention, and these can not influence effect and practical applicability that the present invention implements.
Claims (1)
1. the pinpoint method of Method of Cable Trouble Point, wherein the total length of failure cable is a given data, it is characterized in that, comprises the steps:
Remove the load on the failure cable, with the two ends core separately, and unsettled, with said failure cable wherein the position of an end as check point;
Measure between said each core that separates with Digital Measuring Instrument for Insulation Resistance, and insulation resistance between each core and shielding steel band, thereby confirm the fault core, promptly belong to the core of fault; And then measure between the fault core and each fault core and the direct current resistance that shields between steel band;
The direct current resistance that records all is less than or equal to 1 k Ω's, and adopt cable fault location electric bridge and wave reflection cable fault locator to measure arbitrary fault core respectively and come the cable length value between the localization of faults and the check point, thus localization of faults position; The position of failure point that stream oriented device is measured differs by more than tolerance distance, be as the criterion with the test result of wave reflection cable fault locator this moment, differs to be less than or equal to tolerance distance, and the scope between the position of failure point that stream oriented device is measured is confirmed as the trouble spot scope;
The direct current resistance that records is all greater than 1k Ω's; Use the wave reflection cable fault locator to measure arbitrary fault core and come the cable length value between the localization of faults and the check point, thus localization of faults position, and be the center of circle with this position of failure point; Tolerance distance is a radius, localization of faults scope;
Record direct current resistance not of uniform size; Use the wave reflection cable fault locator to measure arbitrary fault electricity core and come the cable length value between the localization of faults and the check point, thus localization of faults position, and be the center of circle with this position of failure point; Tolerance distance is a radius, localization of faults scope;
Above-mentioned tolerance distance is 5m;
C) between the check point position is to the fault core or between fault core and steel band, apply pulse voltage with cable localization of fault power supply;
Put accurate position or use type cable failure positioning instrument according to sound judgement trouble-shooting in the trouble spot scope of in step b), confirming, in the trouble spot scope of in step b), confirming,, search the accurate position of Method of Cable Trouble Point with sound magnetic-synchro method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104204945A CN102520316A (en) | 2011-12-15 | 2011-12-15 | Method for quickly and accurately positioning fault point of cable |
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| CN2011104204945A CN102520316A (en) | 2011-12-15 | 2011-12-15 | Method for quickly and accurately positioning fault point of cable |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944816A (en) * | 2012-12-07 | 2013-02-27 | 中煤科工集团重庆研究院 | Mine cable line on-line fault diagnosis and positioning device |
| CN104597373A (en) * | 2014-12-24 | 2015-05-06 | 西安电子科技大学 | Acoustic-magnetic synchronous cable fault fixed-point detector based on high-performance DSP |
| CN104655984A (en) * | 2015-01-12 | 2015-05-27 | 国家电网公司 | Method for testing power cable fault |
| CN105259474A (en) * | 2015-10-30 | 2016-01-20 | 中国南方电网有限责任公司电网技术研究中心 | Online fault range finding method of T-connection cable |
| CN106154121A (en) * | 2015-03-30 | 2016-11-23 | 北京航天计量测试技术研究所 | A kind of cable system insulating fault diagnosis method |
| CN107688136A (en) * | 2017-07-31 | 2018-02-13 | 国网山东省电力公司电力科学研究院 | A kind of extra-high voltage long distance transmission line earth point judges and localization method |
| CN109541390A (en) * | 2018-09-21 | 2019-03-29 | 沪东中华造船(集团)有限公司 | A kind of detection method of cable failure |
| CN110161377A (en) * | 2019-06-26 | 2019-08-23 | 武汉三相电力科技有限公司 | A kind of cable fault independent positioning method and equipment |
| CN110446934A (en) * | 2017-03-29 | 2019-11-12 | 保尔有限公司 | The method for carrying out finely positioning for the cable fault to buried cable |
| CN110764019A (en) * | 2019-10-30 | 2020-02-07 | 国网湖北省电力有限公司电力科学研究院 | Line temporary grounding quantity judgment and high-precision positioning method based on double-end measurement |
| CN111095704A (en) * | 2018-08-21 | 2020-05-01 | 华为海洋网络有限公司 | Cable auxiliary equipment and submarine cable auxiliary system |
| CN113514734A (en) * | 2021-04-16 | 2021-10-19 | 西安热工研究院有限公司 | Fault diagnosis method and system for long-distance high-voltage submarine cable |
| CN115032509A (en) * | 2022-06-23 | 2022-09-09 | 海南电网有限责任公司乐东供电局 | Rapid positioning device and method for cable fault point |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540360A (en) * | 2003-04-24 | 2004-10-27 | 新疆特变电工股份有限公司 | Test method for postioning fault point of low resistivity in cable |
-
2011
- 2011-12-15 CN CN2011104204945A patent/CN102520316A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540360A (en) * | 2003-04-24 | 2004-10-27 | 新疆特变电工股份有限公司 | Test method for postioning fault point of low resistivity in cable |
Non-Patent Citations (4)
| Title |
|---|
| 许东升 等: "电力电缆故障现场测距方法的研究与应用", 《高压电器》, vol. 45, no. 5, 31 October 2009 (2009-10-31), pages 136 - 140 * |
| 赖晓峰: "电力电缆故障测距方法的研究", 《云南电力技术》, vol. 34, no. 5, 31 October 2006 (2006-10-31), pages 15 - 17 * |
| 郑秀玉 等: "电力电缆故障定位综述", 《电气应用》, vol. 28, no. 22, 30 November 2009 (2009-11-30), pages 82 - 85 * |
| 魏万华: "关于电力电缆故障及其测试方法的探讨", 《机械研究与应用》, vol. 17, no. 5, 31 October 2004 (2004-10-31), pages 61 - 67 * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944816A (en) * | 2012-12-07 | 2013-02-27 | 中煤科工集团重庆研究院 | Mine cable line on-line fault diagnosis and positioning device |
| CN104597373A (en) * | 2014-12-24 | 2015-05-06 | 西安电子科技大学 | Acoustic-magnetic synchronous cable fault fixed-point detector based on high-performance DSP |
| CN104655984A (en) * | 2015-01-12 | 2015-05-27 | 国家电网公司 | Method for testing power cable fault |
| CN106154121A (en) * | 2015-03-30 | 2016-11-23 | 北京航天计量测试技术研究所 | A kind of cable system insulating fault diagnosis method |
| CN106154121B (en) * | 2015-03-30 | 2018-11-02 | 北京航天计量测试技术研究所 | A kind of cable system insulating fault diagnosis method |
| CN105259474A (en) * | 2015-10-30 | 2016-01-20 | 中国南方电网有限责任公司电网技术研究中心 | Online fault range finding method of T-connection cable |
| CN110446934A (en) * | 2017-03-29 | 2019-11-12 | 保尔有限公司 | The method for carrying out finely positioning for the cable fault to buried cable |
| CN107688136A (en) * | 2017-07-31 | 2018-02-13 | 国网山东省电力公司电力科学研究院 | A kind of extra-high voltage long distance transmission line earth point judges and localization method |
| CN111095704A (en) * | 2018-08-21 | 2020-05-01 | 华为海洋网络有限公司 | Cable auxiliary equipment and submarine cable auxiliary system |
| CN109541390B (en) * | 2018-09-21 | 2021-02-02 | 沪东中华造船(集团)有限公司 | Cable breakage detection method |
| CN109541390A (en) * | 2018-09-21 | 2019-03-29 | 沪东中华造船(集团)有限公司 | A kind of detection method of cable failure |
| CN110161377A (en) * | 2019-06-26 | 2019-08-23 | 武汉三相电力科技有限公司 | A kind of cable fault independent positioning method and equipment |
| CN110764019A (en) * | 2019-10-30 | 2020-02-07 | 国网湖北省电力有限公司电力科学研究院 | Line temporary grounding quantity judgment and high-precision positioning method based on double-end measurement |
| CN110764019B (en) * | 2019-10-30 | 2021-07-30 | 国网湖北省电力有限公司电力科学研究院 | Line temporary grounding quantity judging and positioning method based on double-end measurement |
| CN113514734A (en) * | 2021-04-16 | 2021-10-19 | 西安热工研究院有限公司 | Fault diagnosis method and system for long-distance high-voltage submarine cable |
| CN113514734B (en) * | 2021-04-16 | 2024-06-11 | 西安热工研究院有限公司 | Long-distance high-voltage submarine cable fault diagnosis method and system |
| CN115032509A (en) * | 2022-06-23 | 2022-09-09 | 海南电网有限责任公司乐东供电局 | Rapid positioning device and method for cable fault point |
| CN115032509B (en) * | 2022-06-23 | 2023-11-14 | 海南电网有限责任公司乐东供电局 | Quick positioning device and method for cable fault point |
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Application publication date: 20120627 |