CN102809715B - On-line fault location device for high-voltage power cable - Google Patents
On-line fault location device for high-voltage power cable Download PDFInfo
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- CN102809715B CN102809715B CN201210297572.1A CN201210297572A CN102809715B CN 102809715 B CN102809715 B CN 102809715B CN 201210297572 A CN201210297572 A CN 201210297572A CN 102809715 B CN102809715 B CN 102809715B
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- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000005693 optoelectronics Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 abstract 1
- 230000004807 localization Effects 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Locating Faults (AREA)
Abstract
The invention provides an on-line fault location device for a high-voltage power cable. The on-line fault location device comprises a first terminal and a second terminal which are respectively arranged at two ends of the high-voltage power cable and are in fiber connection with each other, as well as a data processing unit, wherein the first terminal is used for receiving fault generated traveling waves generated by a fault point and simultaneously sending a pulse signal to the second terminal; the second terminal is used for receiving the fault generated traveling waves generated by the fault point, as well as the pulse signal, and recording the time difference value between the fault generated traveling waves and the pulse signal; and the data processing unit is used for calculating the position of the fault point in the high-voltage power cable according to the time difference value. By adopting the technology provided by the invention, the high-voltage power cable can be monitored in a real time manner, and when the major insulation of the cable fails to work, reliable triggering of two-end timing equipment is realized by virtue of pulse waves which are generated at the fault point by the self energy of a power system, and analysis and calculation are carried out according to the timing data so as to acquire the position of the fault point in the high-voltage power cable, so that on-line monitoring and accurate location are achieved, the fault location efficiency is high and the fault location cost is low.
Description
Technical field
The present invention relates to cable fault location technology, particularly relate to a kind of high voltage power cable On-line Fault locating device.
Background technology
At present, high-voltage cable insulating localization of fault technology is mainly the impulse method adopting based on off-line test, when producing cable fault, first power-off, then cable line is untied from system, recycling pulse signal carries out cable fault localization, and range finding be take the parameter model of cable line and is basis, by scene, cable is applied to pulse signal, then calculate trouble spot distance by electric current and voltage travelling wave signal travel-time and velograph in cable.
There is obvious shortcoming in the method, after cable breaks down, need to cable solution mouth is out of service, and then fault measuring equipment is transported to scene, arrange measuring equipment and wiring, could start to measure; Owing to utilizing storage capacitor to carry out high-voltage pulse impact to trouble spot, make trouble spot produce flashover, so storage capacitor need very large capacity, increased the weight of measuring equipment, due to storage capacitor finite capacity, partial fault point cannot produce flashover, may cause measuring unsuccessfully simultaneously; And when terminal is the cable of GIS, Xie Kou is very complicated, even cannot carries out, thereby cannot carry out localization of fault.
Owing to there is above-mentioned open defect, in high-voltage cable insulating localization of fault process, efficiency is lower, cost is higher to cause existing impulse method.
Summary of the invention
Based on this, being necessary, for the existing impulse method problem that efficiency is lower, cost is higher in high-voltage cable insulating localization of fault process, provides a kind of high voltage power cable On-line Fault locating device.
A high voltage power cable On-line Fault locating device, comprising: be located at respectively first terminal and second terminal at high voltage power cable two ends, the data processing unit being connected with described the second terminal;
Described first terminal is connected by optical fiber with the second terminal;
Described first terminal receives the fault traveling wave that trouble spot produces, and transmitted signal is to described the second terminal simultaneously;
Described the second terminal receives fault traveling wave and the described pulse signal that described trouble spot produces, and record receives the time difference between described fault traveling wave and described pulse signal;
Described data processing unit calculates the position of trouble spot in described high voltage power cable according to described time difference.
Above-mentioned high voltage power cable On-line Fault locating device, the Real-Time Monitoring that carries out to high voltage power cable, when the major insulation of cable breaks down, the pulsating wave producing in trouble spot by electric system self-energy, realize the reliable triggering of two ends timing device, in conjunction with chronometric data analytical calculation, obtain Faults of High Voltage Electric Power Cable position again, realize on-line monitoring, accurate location, the efficiency of localization of fault is high, cost is low.
Accompanying drawing explanation
Fig. 1 is the high voltage power cable On-line Fault positioning device structure figure of an embodiment;
Fig. 2 is the first terminal of an embodiment and the structural drawing of the second terminal;
Fig. 3 is the high voltage power cable On-line Fault positioning device structure figure in the high voltage power cable of T-shaped wiring.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of high voltage power cable On-line Fault locating device of the present invention is described in detail.
Fig. 1 shows the high voltage power cable On-line Fault positioning device structure figure of an embodiment, comprising: be located at respectively first terminal and second terminal at high voltage power cable two ends, the data processing unit being connected with described the second terminal.
Wherein:
Described first terminal is connected by optical fiber with the second terminal;
Described first terminal receives the fault traveling wave that trouble spot produces, and transmitted signal is to described the second terminal simultaneously;
Described the second terminal receives fault traveling wave and the described pulse signal that described trouble spot produces, and record receives the time difference between described fault traveling wave and described pulse signal;
Described data processing unit calculates the position of trouble spot in described high voltage power cable according to described time difference.
Particularly, data processing unit reads the time difference of the second terminal record, the online processing to Monitoring Data by communication network.
Because pulse signal is in transmitting procedure, optical fiber for photoelectric conversion device and one section of regular length, the time consuming is known fixed value, the velocity of propagation of fault traveling wave in described high voltage power cable is known, so, according to this time difference and relevant known quantity, can calculate trouble spot in the position of high voltage power cable middle distance the second terminal.
In one embodiment, the computation process of the position of data processing unit calculating trouble spot in high voltage power cable comprises following formula:
ΔT=t″-t';
In formula, Δ T is signed time difference, the length that L is high voltage power cable, T
0for pulse signal is transferred to the spent time of the second terminal from first terminal, t' is that the second terminal receives the described fault traveling wave time constantly, t " be that the second terminal receives the described pulse signal time constantly; l be trouble spot from the distance of the second terminal, v is the velocity of propagation of fault traveling wave in described high voltage power cable.
It should be noted that, for Δ T, if pulse signal than early second terminal that arrives of fault traveling wave, Δ T<0, if fault traveling wave signal than early second terminal that arrives of pulse, Δ T>0 arrives, Δ T=0 simultaneously.
In one embodiment, as shown in Figure 2, first terminal comprises: the first row ripple harvester, pulse signal level generator and photoelectric commutator.
Described the first row ripple harvester receives the fault traveling wave that trouble spot produces;
Described pulse signal level generator produces described pulse signal when described the first row ripple harvester receives described fault traveling wave;
Described photoelectric commutator carries out opto-electronic conversion to described pulse signal.
Described the second terminal comprises: the second row ripple harvester and elapsed time clock;
Described the second row ripple harvester receives the fault traveling wave that trouble spot produces;
Described elapsed time clock starts timing when described the second row ripple harvester receives described fault traveling wave, when receiving described pulse signal, stop timing, or when receiving described pulse signal, start timing, when receiving described fault traveling wave, described the second row ripple harvester stops timing.
For guaranteeing that localization of fault error is no more than 2 meters, accurately detect fault traveling wave due in, preferably, the sampling rate of row ripple harvester sample circuit is more than or equal to 100MHz.
Conventionally the velocity of propagation of current impulse in power cable is 160 meters/microsecond.According to the trouble spot error of calculation, be controlled within the scope of 2 meters and calculate, preferably, adopt the elapsed time clock that resolution is 1ns.
It should be noted that, first terminal and the second terminal are not limited to use above-mentioned device, also can adopt other device to realize its function.
When the first terminal of high voltage power cable On-line Fault locating device employing said structure and the second terminal, its specific works principle is as follows:
The trouble spot of high voltage power cable produces fault traveling wave while discharging, fault traveling wave transmits to cable two ends with identical wave velocity, while arriving the second terminal, (supposes first to arrive), and the second row ripple harvester receives fault traveling wave, and triggering timing clock starts timing.
When first terminal detects fault traveling wave, trigger the first impulse level generator and produce a pulse signal, through the first photoelectric commutator, convert light signal to, then to the second terminal, send the pulse signal through opto-electronic conversion by optical fiber.
When the second terminal receives the pulse signal that the second terminal sends over, (arrive afterwards), elapsed time clock stops timing.
Because trouble spot may appear at cable line optional position along the line, may be near first terminal, also possibility is near the second terminal.
The second terminal is by the chronometric data of elapsed time clock, and time difference T transfers to data processing unit through communication network, by correlation parameter substitution formula (1), calculates the l localization of faults from the distance of the second terminal.
High voltage power cable On-line Fault locating device of the present invention can also be for the high voltage power cable of T-shaped wiring, shown in Figure 3, in T joint, and the high voltage power cable end points place of joint all directions, first terminal and the second terminal are set respectively, can realize the on-line real time monitoring of T-shaped wiring high voltage power cable and localization of fault.
In sum, high voltage power cable On-line Fault locating device of the present invention has following obvious beneficial effect:
(1) adopt online mode to carry out, cable insulation fault is quick and precisely judged, no longer need a large amount of impulse ejections and signal detection apparatus to be transported to measure field temporarily, reduced fault location time, improved breakdown repair efficiency, saved cost.
(2) when positioning system using fault feeder cable itself to produce be down pulse, without by circuit Xie Kou, owing to not relating to comparison and the analysis of fault waveform, saved complicated knowledge figure process, without carrying out Judging fault point by fault waveform analysis experience and technology, the real-time calculating of the triggering of sensor and system, realizes real time fail location.
(3) whole localization of fault process does not need system wiring to make operation and the change of any mode, has solved the high voltage power cable line fault location difficulty problem that T on GIS terminal cable circuit and line connects the mode of connection.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (3)
1. a high voltage power cable On-line Fault locating device, is characterized in that, comprising: be located at respectively first terminal and second terminal at high voltage power cable two ends, the data processing unit being connected with described the second terminal;
Described first terminal is connected by optical fiber with the second terminal;
Described first terminal receives the fault traveling wave that trouble spot produces, and transmitted signal is to described the second terminal simultaneously;
Described the second terminal receives fault traveling wave and the described pulse signal that described trouble spot produces, and record receives the time difference between described fault traveling wave and described pulse signal;
Described first terminal comprises: the first row ripple harvester, pulse signal level generator and photoelectric commutator;
Described the first row ripple harvester receives the fault traveling wave that trouble spot produces;
Described pulse signal level generator produces described pulse signal when described the first row ripple harvester receives described fault traveling wave;
Described photoelectric commutator carries out opto-electronic conversion to described pulse signal;
Described the second terminal comprises: the second row ripple harvester and elapsed time clock;
Described the second row ripple harvester receives described fault traveling wave;
Described elapsed time clock starts timing when described the second row ripple harvester receives described fault traveling wave, when receiving described pulse signal, stop timing, or when receiving described pulse signal, start timing, when receiving described fault traveling wave, described the second row ripple harvester stops timing;
Described data processing unit calculates the position of trouble spot in described high voltage power cable according to described time difference; Computation process comprises:
ΔT＝t"-t'
In formula, Δ T is signed time difference, the length that L is high voltage power cable, T
0for pulse signal is transferred to the spent time of the second terminal from first terminal, t' is that the second terminal receives the described fault traveling wave time constantly, t " be that the second terminal receives the described pulse signal time constantly; l be trouble spot from the distance of the second terminal, v is the velocity of propagation of fault traveling wave in described high voltage power cable.
2. high voltage power cable On-line Fault locating device according to claim 1, is characterized in that, the sampling rate of described row ripple harvester sample circuit is more than or equal to 100MHz.
3. high voltage power cable On-line Fault locating device according to claim 1, is characterized in that, the resolution of described elapsed time clock is 1ns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210297572.1A CN102809715B (en) | 2012-08-20 | 2012-08-20 | On-line fault location device for high-voltage power cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210297572.1A CN102809715B (en) | 2012-08-20 | 2012-08-20 | On-line fault location device for high-voltage power cable |
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| CN102809715A CN102809715A (en) | 2012-12-05 |
| CN102809715B true CN102809715B (en) | 2014-12-10 |
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| CN201210297572.1A Active CN102809715B (en) | 2012-08-20 | 2012-08-20 | On-line fault location device for high-voltage power cable |
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| CN103048588B (en) * | 2012-12-14 | 2015-05-13 | 广州供电局有限公司 | Method and system for on-line locating power cable fault |
| CN103048592B (en) * | 2012-12-14 | 2015-07-08 | 广州供电局有限公司 | Method and system for off-line locating power cable fault |
| CN103076545B (en) * | 2012-12-31 | 2015-09-23 | 广州供电局有限公司 | The charged linear measure longimetry of high-tension cable and Partial Discharge Detection location simulation system |
| CN103176107B (en) * | 2013-03-08 | 2015-01-14 | 山东大学 | High-voltage direct-current power transmission line hybrid fault ranging method |
| CN105116286B (en) * | 2015-08-24 | 2020-06-19 | 江苏省电力公司南京供电公司 | An all-fiber power tunnel cable status real-time monitoring system |
| EP3223026B1 (en) * | 2016-03-22 | 2021-04-28 | Siemens Aktiengesellschaft | Method, device and system for determining the location a fault on a line of an electrical energy supply network |
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| CN113391167B (en) * | 2021-06-23 | 2023-03-10 | 武汉三相电力科技有限公司 | Cable traveling wave positioning system and method |
| CN113447767B (en) * | 2021-06-25 | 2024-07-26 | 北京英瑞来科技有限公司 | Method and system for positioning faults of metal jacket of high-voltage power cable |
| CN114674532B (en) * | 2022-02-27 | 2025-01-07 | 江苏欧软信息科技有限公司 | Optical fiber test data acquisition method and system based on industrial Internet platform |
| CN114859167A (en) * | 2022-04-12 | 2022-08-05 | 国网上海市电力公司 | Time synchronization method for power cable fault positioning |
| CN115032509B (en) * | 2022-06-23 | 2023-11-14 | 海南电网有限责任公司乐东供电局 | A device and method for quickly locating cable fault points |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232176A (en) * | 2008-01-09 | 2008-07-30 | 潍坊学院 | Fault location method for non-effectively grounded distribution system based on transient traveling waves |
| JP2009250847A (en) * | 2008-04-08 | 2009-10-29 | Mitsubishi Electric Corp | Accident-point standardizing device of gas insulation power apparatus |
| CN101762775A (en) * | 2010-01-08 | 2010-06-30 | 山东理工大学 | Method for positioning travelling wave fault of A type overhead line-cable joint line |
| CN102253315A (en) * | 2011-06-28 | 2011-11-23 | 中电普瑞科技有限公司 | Fault location method based on single-terminal location |
| CN102353875A (en) * | 2011-09-30 | 2012-02-15 | 山东理工大学 | Fault distance measuring method for combined travelling wave of power transmission line |
| CN202256575U (en) * | 2011-08-01 | 2012-05-30 | 中煤科工集团重庆研究院 | Online fault location system of cable in pit based on IEEE1588 |
| CN102540020A (en) * | 2012-02-28 | 2012-07-04 | 广东电网公司电力科学研究院 | Method for improving fault positioning precision of power transmission line by adopting online wave speed measurement technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7535233B2 (en) * | 2004-07-15 | 2009-05-19 | Cooper Technologies Company | Traveling wave based relay protection |
-
2012
- 2012-08-20 CN CN201210297572.1A patent/CN102809715B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232176A (en) * | 2008-01-09 | 2008-07-30 | 潍坊学院 | Fault location method for non-effectively grounded distribution system based on transient traveling waves |
| JP2009250847A (en) * | 2008-04-08 | 2009-10-29 | Mitsubishi Electric Corp | Accident-point standardizing device of gas insulation power apparatus |
| CN101762775A (en) * | 2010-01-08 | 2010-06-30 | 山东理工大学 | Method for positioning travelling wave fault of A type overhead line-cable joint line |
| CN102253315A (en) * | 2011-06-28 | 2011-11-23 | 中电普瑞科技有限公司 | Fault location method based on single-terminal location |
| CN202256575U (en) * | 2011-08-01 | 2012-05-30 | 中煤科工集团重庆研究院 | Online fault location system of cable in pit based on IEEE1588 |
| CN102353875A (en) * | 2011-09-30 | 2012-02-15 | 山东理工大学 | Fault distance measuring method for combined travelling wave of power transmission line |
| CN102540020A (en) * | 2012-02-28 | 2012-07-04 | 广东电网公司电力科学研究院 | Method for improving fault positioning precision of power transmission line by adopting online wave speed measurement technology |
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Effective date of registration: 20190617 Address after: 510620 No. 2 Tianhe two road, Tianhe District, Guangzhou, Guangdong Patentee after: Guangzhou Power Supply Bureau Address before: 510620 No. 2 Tianhe two road, Tianhe District, Guangzhou, Guangdong Co-patentee before: Shanghai Welldone Electric Equipment Co., Ltd. Patentee before: Guangzhou Power Supply Bureau |
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Effective date of registration: 20200914 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |