CN102207533A - Method for searching fault of power cable - Google Patents
Method for searching fault of power cable Download PDFInfo
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- CN102207533A CN102207533A CN2011100909909A CN201110090990A CN102207533A CN 102207533 A CN102207533 A CN 102207533A CN 2011100909909 A CN2011100909909 A CN 2011100909909A CN 201110090990 A CN201110090990 A CN 201110090990A CN 102207533 A CN102207533 A CN 102207533A
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Abstract
The invention relates to a method for searching a fault of a power cable. Because the cable is generally buried under the ground, the traditional power cable fault searching method cannot quickly and accurately search the fault point and wastes a long time after the cable is broken down. The technical scheme used by the invention is as follows: the method for searching the fault of the power cable comprises the operation steps of: 1) judging the fault type of the cable, and selecting the testing method according to the fault type of the cable to measure the distance through a distance measurer; and 2) precisely positioning according to the measured distance. The invention has the following advantages of being capable of reducing searching time by 2-3 days in comparison with the traditional cable fault searching method, greatly reducing working time of workers and improving working efficiency because the fault point of the cable can be searched by only needing 1 day by adopting a measuring method comprising distance measurement and then location.
Description
Technical field
The present invention relates to the method that a kind of power cable fault is searched.
Background technology
Power cable line lays hidden, easy to maintenance, reliable owing to it and reason such as beautify the environment, and has obtained at present popularizing in power supply circuits such as city, factory, enterprise.But in a single day cable is in operation and breaks down, and will bring tremendous loss to the high production operation of serialization degree.No matter be high-tension cable or low-voltage cable, in construction and installation, operational process, often cause fault because of reasons such as short circuit, running overload, insulation ag(e)ing or external force effects.Cable fault can be summarized as ground connection, short circuit, broken string three classes, and its fault type mainly contains following several respects: 1. triple cable one core or two core ground connection; 2. short circuit between the two-phase heart yearn; 3. three-phase heart yearn dead short; 4. a phase heart yearn breaks or heterogeneous broken string.Because it is underground that cable is generally all imbedded, after cable breaks down, how to search the trouble spot fast and accurately, promptly the troubleshooting method of cable becomes particularly important.
Summary of the invention
The purpose of this invention is to provide a kind of method that rapid, convenient power cable fault is accurately searched of searching.
To achieve these goals, the technical solution used in the present invention is:
The method that a kind of power cable fault is searched, its special character is: comprise following operation steps:
1) judge the cable fault type, according to cable fault type selecting method of testing with the stadimeter range finding from.
2) accurately locate according to the distance of measuring.
The method that above-mentioned power cable fault is searched, described cable comprises direct-buried cable, searches direct-buried cable fault operational procedure and comprises the steps:
1) with stadimeter range finding from, to judge that at first cable fault is high resistant or low-resistance or ground connection, adopt different method of testings according to this condition, earth fault is directly come measuring distance with the Low Voltage Impulse Method of stadimeter; High resistant and low-resistance fault adopt the method for impacting with high pressure discharge find range from;
2) search the path: add a signal with the path signal generator to cable, receive this signal with receiver again, have the signal place to be the path of cable.But the scope in this path will not be accurate especially between 1-2 rice roughly.
3) accurately locate according to the distance of measuring:, hear that with the earphone of fixed point apparatus the place of sound maximum is the position of trouble spot according to the sound of sparking discharge generation.But, owing to be listening, so, be subjected to the influence of environmental noise, look for quite time-consumingly, to wait until that sometimes evening is just passable.When running into crosslinked cable, just more time-consuming, because crosslinked cable all is an internal discharge generally, sound is very little, almost can't hear, and has only measured at last.
The method that above-mentioned power cable fault is searched, described cable comprises the crane span structure inner cable, searches the crane span structure inner cable fault operational procedure that is laid in and comprises the steps:
1) with stadimeter range finding from, to judge that at first cable fault is high resistant or low-resistance or ground connection, adopt different method of testings according to this condition, earth fault is directly come measuring distance with the Low Voltage Impulse Method of stadimeter; High resistant and low-resistance fault adopt the method for impacting with high pressure discharge find range from.
2) accurately locate according to the distance of measuring: cable duct is exactly the position of Method of Cable Trouble Point by the place of sooting.
With respect to prior art, advantage of the present invention is: than existing cable fault lookup method, can shorten about the 10 days time of searching.In whole cable work, adopt in the engineering of high-voltage tester charging, need the technical skill personnel to carry out complete monitoring, in this monitor procedure, electric current and cable insulation situation are checked waste of manpower and time, the present invention utilizes the measuring method that relocates after the range finding, the place that only needed 3-4 days just can find cable to break down has significantly reduced working time of staff, the work efficiency of raising.
Description of drawings
Fig. 1 is a schematic diagram of the present invention,
TB-HT testing transformer wherein, C-high-voltage capacitor, VE-high-voltage rectification silicon stack, R-current-limiting resistance, Q-ball discharge gap, L-cable core.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, search the ultimate principle of cable fault method: after cable breaks down, all adopt traditional impacting with high pressure " flashover method " to come test failure." flashover method " also is " echo sounding ", searches according to the sound of failure cable discharge exactly, and this method is comparatively effective to the discharge of insulation course flashover for the high-tension cable heart yearn.The method device therefor is the DC voltage withstand test machine, TB is a HT testing transformer, C is a high-voltage capacitor, VE is a high-voltage rectification silicon stack, R is a current-limiting resistance, Q is the ball discharge gap, L is a cable core, when high-voltage capacitor C is charged to certain voltage value, ball discharge gap Q, establishes cable for surface and can directly search with the sense of hearing at the spark discharge sound that the cable core L of fault place " is grown, grown " the insulation course discharge generation failure cable heart yearn L discharge, if cable louding will be determined and indicate to underground cable then at first.The noise minimum the time, search by audio frequency multiplying arrangements such as deaf-aid set or stethoscopes.When searching, with the acoustic pickup ground proximity, slowly move along cable louding, when discharging sound was maximum, this place was the trouble spot when hearing " grow, grow ".
Search the process of power cable:
1, instrument is as shown in the table:
2, constructing operation program
Embodiment 1:
The operational procedure of direct-buried cable troubleshooting:
The first step earlier with the stadimeter range finding from.To judge that at first cable fault is high resistant or low-resistance or ground connection, adopt different method of testings according to this condition.If earth fault is just directly come measuring distance with the Low Voltage Impulse Method of stadimeter; If high resistant or low-resistance fault will adopt the method for impacting with high pressure discharge find range from.
Second step was to search path (can save if this step is known in the path).When searching the path, add a signal with the path signal generator to cable, receive this signal with receiver again, walk one time along the path that signal is arranged, just determined the path of cable.But the scope in this path will not be accurate especially between 1-2 rice roughly.
The 3rd step was accurately to locate according to the distance of measuring.It when the local time of hearing the sound maximum from the earphone of fixed point apparatus, has just found the position of trouble spot according to the sound that is the sparking discharge generation.
Embodiment 2:
The operational procedure of crane span structure inner cable troubleshooting is laid in:
The first step earlier with the stadimeter range finding from.To judge that at first cable fault is high resistant or low-resistance or ground connection, adopt different method of testings according to this condition.If earth fault is just directly come measuring distance with the Low Voltage Impulse Method of stadimeter; If high resistive fault will adopt the method for impacting with high pressure discharge find range from.
The second step Direct observation cable duct is exactly the position of Method of Cable Trouble Point by the place of sooting.
Claims (3)
1. method that power cable fault is searched is characterized in that: comprise following operation steps:
1) judge the cable fault type, according to cable fault type selecting method of testing with the stadimeter range finding from;
2) accurately locate according to the distance of measuring.
2. the method that power cable fault according to claim 1 is searched is characterized in that: described cable comprises direct-buried cable, searches direct-buried cable fault operational procedure and comprises the steps:
1) with stadimeter range finding from, to judge that at first cable fault is high resistant or low-resistance or ground connection, adopt different method of testings according to this condition, earth fault is directly come measuring distance with the Low Voltage Impulse Method of stadimeter; High resistant and low-resistance fault adopt the method for impacting with high pressure discharge find range from;
2) search the path: add a signal with the path signal generator to cable, receive this signal with receiver again, have the signal place to be the path of cable;
3) accurately locate according to the distance of measuring:, hear that with the earphone of fixed point apparatus the place of sound maximum is the position of trouble spot according to the sound of sparking discharge generation.
3. the method that power cable fault according to claim 1 is searched is characterized in that: described cable comprises the bridge formation inner cable, searches the crane span structure inner cable fault operational procedure that is laid in and comprises the steps:
1) with stadimeter range finding from, to judge that at first cable fault is high resistant or low-resistance or ground connection, adopt different method of testings according to this condition, earth fault is directly come measuring distance with the Low Voltage Impulse Method of stadimeter; High resistant and low-resistance fault adopt the method for impacting with high pressure discharge find range from;
2) accurately locate according to the distance of measuring: cable duct is exactly the position of Method of Cable Trouble Point by the place of sooting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100909909A CN102207533A (en) | 2011-04-12 | 2011-04-12 | Method for searching fault of power cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100909909A CN102207533A (en) | 2011-04-12 | 2011-04-12 | Method for searching fault of power cable |
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| CN102207533A true CN102207533A (en) | 2011-10-05 |
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| CN2011100909909A Pending CN102207533A (en) | 2011-04-12 | 2011-04-12 | Method for searching fault of power cable |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759686A (en) * | 2012-07-26 | 2012-10-31 | 山东科汇电力自动化有限公司 | Method for locating power cable faults |
| CN102879719A (en) * | 2012-09-29 | 2013-01-16 | 大唐黄岛发电有限责任公司 | Method and circuit for quickly searching insulation faults of electrical equipment |
| CN104833902A (en) * | 2015-05-19 | 2015-08-12 | 济南裕兴化工有限责任公司 | Bridge laying cable low-resistance fault point positioning method |
| CN105260863A (en) * | 2015-11-26 | 2016-01-20 | 国家电网公司 | Fault single influence factor analysis method based on power cable fault information |
| CN105606953A (en) * | 2015-09-09 | 2016-05-25 | 西安电子科技大学 | Automatic mute and intelligent background noise reduction reset sound and magnetism synchronization fixing point instrument |
| CN105717419A (en) * | 2016-04-21 | 2016-06-29 | 江苏省电力公司苏州供电公司 | Multiple correspondence analysis method for power cable fault behaviour |
| CN105807185A (en) * | 2016-03-16 | 2016-07-27 | 西安宇铭电物理技术有限责任公司 | Resistance lowering device and method for a power cable high-resistance fault point |
| CN106124925A (en) * | 2016-06-12 | 2016-11-16 | 广东电网有限责任公司惠州供电局 | The distance-finding method of transmission line malfunction and device and locating verification method and system |
| CN106646143A (en) * | 2016-12-20 | 2017-05-10 | 国网河北省电力公司电力科学研究院 | Method and system for puncturing high-resistance fault point of cable based on charge superposition principle |
| CN107340440A (en) * | 2017-05-22 | 2017-11-10 | 合肥瑞达软件科技有限公司 | The system for searching cable trace online using cloud computing |
| CN110118916A (en) * | 2019-06-25 | 2019-08-13 | 武汉伏佳安达电气技术有限公司 | A kind of high voltage power cable circulating current fault detection method |
| CN110726906A (en) * | 2019-10-15 | 2020-01-24 | 武汉三相电力科技有限公司 | Method and system for detecting cable length |
| CN113092938A (en) * | 2021-04-07 | 2021-07-09 | 山东卓文信息科技有限公司 | Low-voltage power line fault detection positioning system and fault detection method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759686A (en) * | 2012-07-26 | 2012-10-31 | 山东科汇电力自动化有限公司 | Method for locating power cable faults |
| CN102879719A (en) * | 2012-09-29 | 2013-01-16 | 大唐黄岛发电有限责任公司 | Method and circuit for quickly searching insulation faults of electrical equipment |
| CN102879719B (en) * | 2012-09-29 | 2015-07-15 | 大唐黄岛发电有限责任公司 | Method and circuit for quickly searching insulation faults of electrical equipment |
| CN104833902B (en) * | 2015-05-19 | 2017-09-29 | 济南裕兴化工有限责任公司 | Crane span structure cabling low resistance fault point positioning method |
| CN104833902A (en) * | 2015-05-19 | 2015-08-12 | 济南裕兴化工有限责任公司 | Bridge laying cable low-resistance fault point positioning method |
| CN105606953A (en) * | 2015-09-09 | 2016-05-25 | 西安电子科技大学 | Automatic mute and intelligent background noise reduction reset sound and magnetism synchronization fixing point instrument |
| CN105606953B (en) * | 2015-09-09 | 2018-06-29 | 西安电子科技大学 | A kind of automatic sound magnetic-synchro fixed point apparatus for closing sound and being reset with intelligent background noise reduction |
| CN105260863A (en) * | 2015-11-26 | 2016-01-20 | 国家电网公司 | Fault single influence factor analysis method based on power cable fault information |
| CN105807185A (en) * | 2016-03-16 | 2016-07-27 | 西安宇铭电物理技术有限责任公司 | Resistance lowering device and method for a power cable high-resistance fault point |
| CN105807185B (en) * | 2016-03-16 | 2019-04-23 | 西安宇铭电物理技术有限责任公司 | A kind of device and method of power cable high resistive fault point resistance lowering |
| CN105717419A (en) * | 2016-04-21 | 2016-06-29 | 江苏省电力公司苏州供电公司 | Multiple correspondence analysis method for power cable fault behaviour |
| CN106124925A (en) * | 2016-06-12 | 2016-11-16 | 广东电网有限责任公司惠州供电局 | The distance-finding method of transmission line malfunction and device and locating verification method and system |
| CN106646143A (en) * | 2016-12-20 | 2017-05-10 | 国网河北省电力公司电力科学研究院 | Method and system for puncturing high-resistance fault point of cable based on charge superposition principle |
| CN107340440A (en) * | 2017-05-22 | 2017-11-10 | 合肥瑞达软件科技有限公司 | The system for searching cable trace online using cloud computing |
| CN110118916A (en) * | 2019-06-25 | 2019-08-13 | 武汉伏佳安达电气技术有限公司 | A kind of high voltage power cable circulating current fault detection method |
| CN110726906A (en) * | 2019-10-15 | 2020-01-24 | 武汉三相电力科技有限公司 | Method and system for detecting cable length |
| CN113092938A (en) * | 2021-04-07 | 2021-07-09 | 山东卓文信息科技有限公司 | Low-voltage power line fault detection positioning system and fault detection method |
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Application publication date: 20111005 |