CN103926510A - Current and carrying capacity online monitoring and fault diagnosing and locating method for cable protection layer - Google Patents

Current and carrying capacity online monitoring and fault diagnosing and locating method for cable protection layer Download PDF

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Publication number
CN103926510A
CN103926510A CN201410199082.7A CN201410199082A CN103926510A CN 103926510 A CN103926510 A CN 103926510A CN 201410199082 A CN201410199082 A CN 201410199082A CN 103926510 A CN103926510 A CN 103926510A
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China
Prior art keywords
cable
current
data
fault
capacity
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CN201410199082.7A
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Chinese (zh)
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CN103926510B (en
Inventor
袁燕岭
董杰
陈昕
周灏
郝乾
梁东
夏福庆
苗辉
高俊福
史顺金
张博宇
李进军
穆勇
高中强
韩宝华
李振成
Original Assignee
国家电网公司
国网冀北电力有限公司唐山供电公司
北京伏佳安达电气技术有限公司
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Priority to CN201410199082.7A priority Critical patent/CN103926510B/en
Publication of CN103926510A publication Critical patent/CN103926510A/en
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Publication of CN103926510B publication Critical patent/CN103926510B/en

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Abstract

The invention relates to a current and carrying capacity online monitoring and fault diagnosing and locating method for a cable protection layer, and belongs to the technical field of online monitoring and fault diagnosing and locating for power cables. According to the technical scheme, current data are collected by protection layer current sensors and a carrying capacity sensor synchronously and are uploaded to a data management platform through a communication network; state monitoring data are collected regularly, automatically processed and temporarily or permanently stored by the data management platform and are displayed on a monitoring center screen in real time, and various data reporting functions are provided; real-time protection layer current data in a database management platform are extracted and compared with an expected value by a fault diagnosing system; warning information is provided to cable operation maintaining personnel through an alarm unit once a fault in the cables is found. According to the current and carrying capacity online monitoring and fault diagnosing and locating method for the cable protection layer, power cable operation states can be monitored in real time, fault diagnosis and locating and warning prompting can be carried out automatically when abnormal monitoring information appears, a cable fault type can be accurately diagnosed, located and selected, and manpower and financial resources can be saved.

Description

A kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method
Technical field
The present invention relates to a kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, relate in particular to a kind of ratio relation by cross interconnected cable sheath electric current real-time measurement values and desired value and diagnose the also method of positioning cable fault, belong to power cable on-line monitoring and fault diagonosing and field of locating technology.
Background technology
Along with the development in city, the quantity of 110kV and above single core high voltage power cable application sharply increases, and cable load increases day by day, and the cable metal sheath ground current problem that the operation of a large amount of single core cables brings more and more receives people's concern.Under normal circumstances, general cross interconnected two sides earth or the single-ended directly grounded method of operation of adopting of the metal sheath of 110kV and above high voltage single-core cable.Specify according to GB-50217 " Code for design of cables of electric works ": on the metal level of interchange single-core power cables, the normal induction electromotive force maximal value at any point non_direct ground place should meet following regulation: while not taking effectively to prevent the safety practice of any contact metal layer of personnel, must not be greater than 50V; Except above-mentioned situation, must not be greater than 300V.High-tension cable is because its structure adopts single cored structure, and according to electromagnetics principle, this must cause and on protective metal shell, occur induced voltage.In order to reduce the induced voltage on cable cover(ing), making it can be not excessive, will be by cable metal sheath segmentation ground connection, to limit the size of induced voltage in engineering.Under normal circumstances, the induced voltage in sheath is lower, meets design standards.But; in the time that the cross interconnected earth point of intermediate head or cable body metal sheath break down; can cause outer jacket to puncture or sheath protector burns; more seriously can cause cable major insulation to puncture; likely there is multipoint earthing in metal sheath in this case; form very high circulating current; so both reduced the current-carrying capacity of cable; waste again electric energy and form loss; and it is aging to have accelerated cable insulation; therefore need regularly the ground current of above-mentioned cable metal sheath to be detected, to prevent that cable fault from causing the power failure of unplanned property.
The detection means of background technology mainly comprises: (1) regular or irregular manual patrol, to find the abnormal and hidden danger of high-tension cable and affiliated facility thereof and process in time; (2) regularly hv cable termination, the first-class critical cables annex of indirect are carried out to artificial infrared thermal imaging test; (3) regular manual measurement high-tension cable metal sheath electric current; (4) every year important Voltage Cable Lines Construction is carried out to preventive trial one time, main project comprises that testing insulation resistance of main, insulating sheath resistance and major insulation does AC voltage withstand test.In real work, because the laying total length of Voltage Cable Lines Construction increases gradually, all strictly carry out artificial daily operation maintenance and service work because its high cost of labor is difficult to realize by code.Especially high-voltage cable joint or terminal be conventionally arranged in special electric power work well or high-tension cable shaft tower on, the state parameter such as metal sheath electric current or surface temperature of these cables of manual measurement need to spend a large amount of human and material resources, financial resources; Simultaneously owing to regularly detecting or making an inspection tour circuit, in section, conventionally cannot know the real-time running state of high-tension cable the interval time of patrolling and examining for twice, so that before high-tension cable fault occurs, operation maintenance personnel cannot obtain necessary early warning information in time, have caused some unnecessary economic losses.Therefore it is very necessary, developing a set of circulating current on-line monitoring technique that can be used for cable fault diagnosis location.
Summary of the invention
The object of the invention is to provide a kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, and diagnosis and the location of realizing fault in cable by circulating current on-line monitoring solve the problem existing in background technology.
Technical scheme of the present invention is:
A kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method, comprise following steps:
1. realize cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing location by data acquisition module, communication network, data management platform and fault diagnosis module;
2. data acquisition module is made up of multiple circulating current sensors and a current-carrying capacity sensor; Cross interconnected grounding box incoming line place under the charged ruuning situation of cable is set with that pincerlike current sensor gathers circulating current signal and by being sleeved on the pincerlike current sensor on cable body, gathers current-carrying capacity of cable data; By data collecting card synchronous acquisition current signal; Uploading the circulating current and current-carrying capacity data to the data management platform that collect carries out theory calculating and cable information is stored in database;
3. circulating current and the current-carrying capacity data of the circulating current in data acquisition module and current-carrying capacity sensor sample high-tension cable, be then uploaded to by communication network the data management platform that is positioned at Surveillance center; Data management platform timing is collected, is automatically processed and interim or permanent storage Condition Monitoring Data, and shows in real time all status datas on Surveillance center's screen, and various data sheet functions are provided simultaneously; The database of data management platform is used for depositing the Condition Monitoring Data of various interim or permanent storage; The interim data that store are made up of Real-time Monitoring Data; The data of permanent storage comprise the parameters value of object cable: section length, phase spacing, cable design parameter, and the desired value of circulating current under different loads condition and the ratio relation of two joint circulating current measured values of each measurement point under the non-failure condition going out according to these parameter value calculation;
4. fault diagnosis module, by the expected value of storing in the data of Real-Time Monitoring and cable status database is compared, is assessed the health status of cable; In the time that the deviation of cable real time data and non-malfunction desired value is greater than setting value, according to the status information in database, the typical fault in cable is diagnosed and located.
The present invention is also provided with alarm unit, comprises large screen display interface and the alarm mode of jumping out warning window; In the time there is early warning information, monitoring main frame can be notified high-tension cable operation maintenance personnel timely and effectively, realize the object of high-tension cable state comprehensive on-line monitoring, early warning, be convenient to the state that high-tension cable operation maintenance personnel grasp cable and running environment thereof at any time, find in time defect, avoid occurring electric power accident.
The invention has the beneficial effects as follows: (1) energy Real-Time Monitoring power cable ruuning situation, monitoring information is transferred to the data management platform record analysis of system, while there is abnormal monitoring information, automatically carry out fault diagnosis location early warning; (2) equate for cable section length and the cross interconnected threephase cable of return wire is installed, having proposed a set of circulating current amplitude standard that can be used for cable fault diagnosis location; (3) overcome in existing fault diagnosis technology, the simple criterion that circulating current changes, can also locate the cable fault type of choosing by Accurate Diagnosis; Abandon after unusual circumstance, carried out the traditional approach of trouble-shooting point by line walking, saved manpower financial capacity.
Brief description of the drawings
Fig. 1 is the structural drawing of circulating current on-line monitoring level fault diagnosis positioning system; The 1st, Surveillance center, the 2nd, data acquisition module, comprises multiple current sensors, the 3rd, fault diagnosis locating module, the 4th, alarm unit, the 5th, Database Systems, the 6th, communication system;
Fig. 2 is the cross interconnected wiring of threephase cable and installation of sensors schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, fundamental purpose of the present invention is to realize the circulating current on-line monitoring function in high-tension cable metal sheath, realizes the real-time monitoring to Voltage Cable Lines Construction, and can find in time cable fault defect and send warning.Circulating current and current-carrying capacity sensor synchronous acquisition current data are also uploaded to data management platform by communication network.Data management platform timing is collected, is automatically processed and interim or permanent storage Condition Monitoring Data, and shows in real time all status datas on Surveillance center's screen, and various data sheet functions are provided simultaneously.Fault diagnosis system extract real-time circulating current data in data base administration platform and with desired value comparison.Once the fault in discovery cable, its type of automatic diagnosis be positioned to place joint or loop provides early warning information by alarm unit for cable operation maintenance personnel simultaneously.
As shown in Figure 2, for cross interconnected grounding box JX1, the electric current that three measurement point current transformers are surveyed is respectively , , , for cross interconnected grounding box JX2, the electric current that three measurement point current transformers are surveyed is respectively , , , the measured three-phase equilibrium load current of current-carrying capacity sensor is .By ratio and the circulating current of circulating current and current-carrying capacity , , between three ratios, can diagnose following several fault and be positioned to place joint or sheath loop, as shown in table 1.
With represent circulating current desired value (desired value is with load variations), use represent represent desired value, when threephase cable section length equates and system while being provided with return wire, fault diagnosis and location can be according to following standards:
" if the real-time measurement values at certain sensor place is 0 ";
Fault type=" this place's sensor fault "
" if real-time measurement values is all 0 ";
Fault type=" circuit zero load "
If " for arbitrarily , can make inequality set up and for arbitrarily , can make inequality set up ";
Circuit normally moves
If " exist , make inequality set up and for arbitrarily , can make inequality set up ", enter this section of determination flow:
If " for arbitrarily , can make inequality set up and for arbitrarily , can make inequality set up ";
Fault type=" 1 "
If " for arbitrarily , can make inequality set up and for arbitrarily , can make inequality set up ";
Fault type=" 2 "
If " for arbitrarily , can make inequality set up and for arbitrarily , can make inequality set up ";
Fault type=" 3 "
If " for arbitrarily , can make inequality set up ";
Fault type=" 6 "
Otherwise fault type=" UNKNOWN TYPE "
If " exist make inequality set up and exist , make inequality set up ", enter this section of determination flow:
If " for arbitrarily , can make inequality set up ";
Fault type=" 4 "
If " for arbitrarily , can make inequality set up ";
Fault type=" 5 "
If " and exist , make inequality set up ";
Fault type=" 7 "
If " and for arbitrarily , can make inequality set up ";
Fault type=" 10 "
If " and exist , make inequality set up ";
Fault type=" 8 "
If " and for arbitrarily , can make inequality set up ";
Fault type=" 11 "
If " and exist , make inequality set up ";
Fault type=" 9 "
If " and for arbitrarily , can make inequality set up ";
Fault type=" 12 "
Otherwise fault type=" UNKNOWN TYPE "
In the time that the circulating current numerical value of Real-Time Monitoring reaches fault expection current value, fault diagnosis positioning system is automatically according to the kind of the big or small failure judgement of measured data and position, and in the large screen display early warning information of Surveillance center, cable operation maintenance personnel can be processed early, for ensureing that power system stability provides important support to fault.

Claims (2)

1. cable sheath electric current and a current-carrying capacity on-line monitoring and fault diagonosing localization method, is characterized in that, comprises following steps:
1. realize cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing location by data acquisition module, communication network, data management platform and fault diagnosis module;
2. data acquisition module is made up of multiple circulating current sensors and a current-carrying capacity sensor; Cross interconnected grounding box incoming line place under the charged ruuning situation of cable is set with that pincerlike current sensor gathers circulating current signal and by being sleeved on the pincerlike current sensor on cable body, gathers current-carrying capacity of cable data; By data collecting card synchronous acquisition current signal; Uploading the circulating current and current-carrying capacity data to the data management platform that collect carries out theory calculating and cable information is stored in database;
3. circulating current and the current-carrying capacity data of the circulating current in data acquisition module and current-carrying capacity sensor sample high-tension cable, be then uploaded to by communication network the data management platform that is positioned at Surveillance center; Data management platform timing is collected, is automatically processed and interim or permanent storage Condition Monitoring Data, and shows in real time all status datas on Surveillance center's screen, and various data sheet functions are provided simultaneously; The database of data management platform is used for depositing the Condition Monitoring Data of various interim or permanent storage; The interim data that store are made up of Real-time Monitoring Data; The data of permanent storage comprise the parameters value of object cable: section length, phase spacing, cable design parameter, and the desired value of circulating current under different loads condition and the ratio relation of two joint circulating current measured values of each measurement point under the non-failure condition going out according to these parameter value calculation;
4. fault diagnosis module, by the expected value of storing in the data of Real-Time Monitoring and cable status database is compared, is assessed the health status of cable; In the time that the deviation of cable real time data and non-malfunction desired value is greater than setting value, according to the status information in database, the typical fault in cable is diagnosed and located.
2. a kind of cable sheath electric current according to claim 1 and current-carrying capacity on-line monitoring and fault diagonosing localization method, is characterized in that the present invention is also provided with alarm unit, comprises large screen display interface and the alarm mode of jumping out warning window; In the time there is early warning information, monitoring main frame can be notified high-tension cable operation maintenance personnel timely and effectively, realize the object of high-tension cable state comprehensive on-line monitoring, early warning, be convenient to the state that high-tension cable operation maintenance personnel grasp cable and running environment thereof at any time, find in time defect, avoid occurring electric power accident.
CN201410199082.7A 2014-05-12 2014-05-12 A kind of cable sheath electric current and current-carrying capacity on-line monitoring and fault diagonosing localization method CN103926510B (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104301689A (en) * 2014-10-29 2015-01-21 杭州凯达电力建设有限公司 Electric power monitoring method and system
CN104678257A (en) * 2015-02-08 2015-06-03 云南酷联科技有限公司 Method for positioning faults of high voltage single-core cable protective layer accurately
CN104808115A (en) * 2015-05-08 2015-07-29 国网上海市电力公司 Split acquisition terminal for recognition of low-voltage faulted cables
CN105759176A (en) * 2016-04-20 2016-07-13 国网浙江省电力公司杭州供电公司 Cable monitoring grounding box and cable monitoring system
CN106093679A (en) * 2016-06-23 2016-11-09 顾鸿鸣 A kind of cable on-line checking and fault diagnosis system
CN107728001A (en) * 2017-08-21 2018-02-23 国网北京市电力公司 Three-phase cross cable current fault detection device
CN109035659A (en) * 2018-08-27 2018-12-18 许继集团有限公司 A kind of high voltage power cable anti-theft monitoring method and device
CN109031021A (en) * 2018-07-18 2018-12-18 武汉易摩特科技有限公司 A kind of high voltage single-core cable short trouble localization method, apparatus and system
CN109342882A (en) * 2018-11-06 2019-02-15 长沙理工大学 Cable fault on-line monitoring method based on multi-source Eigenvalues analysis
CN109375028A (en) * 2018-08-27 2019-02-22 许继集团有限公司 A kind of broken string recognition methods of high voltage power cable circulating current sensor and device
CN110031732A (en) * 2019-04-15 2019-07-19 安徽康能电气有限公司 A kind of comprehensive on-line monitoring system of cable sheath
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
CN110208629A (en) * 2019-06-28 2019-09-06 国网上海市电力公司 A kind of automatic fault recognition system for Voltage Cable Lines Construction
CN110514960A (en) * 2019-08-23 2019-11-29 索尔实业(集团)有限公司 A kind of cable fault locating platform
CN112083272A (en) * 2020-08-18 2020-12-15 昆明理工大学 10kV cable fault location method based on sheath current traveling wave natural frequency difference method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101593944A (en) * 2009-03-19 2009-12-02 江苏省电力公司苏州供电公司 The single-core power cables method for pre-controlling cross interconnected sheathing induction current
EP2421110A1 (en) * 2010-08-20 2012-02-22 Schneider Electric Industries SAS Directional detection of an earth fault with a single sensor
CN103528701A (en) * 2013-10-18 2014-01-22 国家电网公司 Online monitoring system for temperature and current carrying capacity of power cable
CN203465382U (en) * 2013-08-28 2014-03-05 国家电网公司 Insulation monitoring system of high-voltage cable sheath
CN103630814A (en) * 2013-12-11 2014-03-12 国家电网公司 Insulating dielectric loss angle tendency online monitoring method of high-voltage cables under cross interconnection
CN103698653A (en) * 2013-12-30 2014-04-02 国家电网公司 System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101593944A (en) * 2009-03-19 2009-12-02 江苏省电力公司苏州供电公司 The single-core power cables method for pre-controlling cross interconnected sheathing induction current
EP2421110A1 (en) * 2010-08-20 2012-02-22 Schneider Electric Industries SAS Directional detection of an earth fault with a single sensor
CN203465382U (en) * 2013-08-28 2014-03-05 国家电网公司 Insulation monitoring system of high-voltage cable sheath
CN103528701A (en) * 2013-10-18 2014-01-22 国家电网公司 Online monitoring system for temperature and current carrying capacity of power cable
CN103630814A (en) * 2013-12-11 2014-03-12 国家电网公司 Insulating dielectric loss angle tendency online monitoring method of high-voltage cables under cross interconnection
CN103698653A (en) * 2013-12-30 2014-04-02 国家电网公司 System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104301689A (en) * 2014-10-29 2015-01-21 杭州凯达电力建设有限公司 Electric power monitoring method and system
CN104678257A (en) * 2015-02-08 2015-06-03 云南酷联科技有限公司 Method for positioning faults of high voltage single-core cable protective layer accurately
CN104678257B (en) * 2015-02-08 2017-07-11 云南酷联科技有限公司 A kind of pinpoint method of high voltage single-core cable protective layer failure
CN104808115A (en) * 2015-05-08 2015-07-29 国网上海市电力公司 Split acquisition terminal for recognition of low-voltage faulted cables
CN105759176A (en) * 2016-04-20 2016-07-13 国网浙江省电力公司杭州供电公司 Cable monitoring grounding box and cable monitoring system
CN106093679A (en) * 2016-06-23 2016-11-09 顾鸿鸣 A kind of cable on-line checking and fault diagnosis system
CN107728001A (en) * 2017-08-21 2018-02-23 国网北京市电力公司 Three-phase cross cable current fault detection device
CN109031021A (en) * 2018-07-18 2018-12-18 武汉易摩特科技有限公司 A kind of high voltage single-core cable short trouble localization method, apparatus and system
CN109035659A (en) * 2018-08-27 2018-12-18 许继集团有限公司 A kind of high voltage power cable anti-theft monitoring method and device
CN109035659B (en) * 2018-08-27 2020-02-21 许继集团有限公司 Anti-theft cutting monitoring method and device for high-voltage power cable
CN109375028A (en) * 2018-08-27 2019-02-22 许继集团有限公司 A kind of broken string recognition methods of high voltage power cable circulating current sensor and device
CN109342882A (en) * 2018-11-06 2019-02-15 长沙理工大学 Cable fault on-line monitoring method based on multi-source Eigenvalues analysis
CN110031732A (en) * 2019-04-15 2019-07-19 安徽康能电气有限公司 A kind of comprehensive on-line monitoring system of cable sheath
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
CN110208629A (en) * 2019-06-28 2019-09-06 国网上海市电力公司 A kind of automatic fault recognition system for Voltage Cable Lines Construction
CN110514960A (en) * 2019-08-23 2019-11-29 索尔实业(集团)有限公司 A kind of cable fault locating platform
CN112083272A (en) * 2020-08-18 2020-12-15 昆明理工大学 10kV cable fault location method based on sheath current traveling wave natural frequency difference method

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