CN101464488B - On-line monitoring system for high voltage cable - Google Patents

On-line monitoring system for high voltage cable Download PDF

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Publication number
CN101464488B
CN101464488B CN2009100454713A CN200910045471A CN101464488B CN 101464488 B CN101464488 B CN 101464488B CN 2009100454713 A CN2009100454713 A CN 2009100454713A CN 200910045471 A CN200910045471 A CN 200910045471A CN 101464488 B CN101464488 B CN 101464488B
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CN
China
Prior art keywords
cable
data
high
voltage cable
acquisition unit
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CN2009100454713A
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Chinese (zh)
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CN101464488A (en
Inventor
孔德武
严有祥
丁鹏
忻正荣
易军
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上海慧东电气设备有限公司
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Priority to CN2009100454713A priority Critical patent/CN101464488B/en
Publication of CN101464488A publication Critical patent/CN101464488A/en
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Publication of CN101464488B publication Critical patent/CN101464488B/en

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    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management
    • Y04S10/522Fault detection or location

Abstract

The invention relates to an online monitoring system for high-voltage cables, which comprises a sensor, a data collection unit, a power supply device, and a network server. The sensor is arranged at the joint of a high-voltage cable and is used for collecting data such as the shield circulating current of the high-voltage cable joint, the core current, the surface temperature of the cable, and the ambient humidity and temperature and transmitting the data to the data collection unit. The data collection unit is arranged nearby the high-voltage cable joint and is used for collecting the data transmitted from the sensor and transmitting the date to the network server via a wireless network. The power supply device acquires power from the high-voltage cable and provides power to the data collection unit. The network server is installed in a control room and is used for receiving the data transmitted from the data collection unit in order to determine whether the power cable is in safe operation condition via special data analysis, thereby serving the purpose of helping maintenance personnel monitor the operation condition of the power cable at any time, and preventing the electrical faults from happening. In case that faults occur with the cable, the online monitoring system can send alarms promptly and locate fault points, thereby providing assistance for cable repair.

Description

A kind of on-line monitoring system for high voltage cable

[technical field]

The present invention relates to a kind of monitoring system, refer in particular to a kind of system at the high-tension cable on-line monitoring.

[background technology]

Modern urban construction is carried electric power and is had higher requirement, and along with the continuous development of electric utility, the city overhead transmission line send electricity to be replaced by underground high voltage cable, so the quantity of high-tension cable just sharply rises.These cable lines are as the ingredient of power transmission network, and its status is very important, guarantee that the safe operation of cable line is very important.

Different with overhead transmission line, because the residing circumstance complication of underground cable has brought difficulty to operation maintenance.Because cable exists defective and hidden danger, and need expend a lot of man power and materials and carry out cable maintenance.To do following operation maintenance and checking experiment work for Voltage Cable Lines Construction:

1. regular or irregular the tour is with also timely defective or the hidden danger handled of the unusual and hidden danger of finding cable and affiliated facility thereof;

2. per season is carried out an infrared thermal imaging test to cable termination, intermediate head and affiliated facility;

3. per season is measured a cable sheath circulating current;

4. carry out one time preventive trial after new cable put into operation 1 year, carried out preventive trial one time in after this per 6 years, main project is that test insulation resistance of main, insulating sheath resistance and major insulation are done AC voltage withstand test.

In the real work,, strict and do operation maintenance and service work can not be accomplished by rules because cable line is more and more.There are a large amount of direct ground connection casees or cross interconnected ground connection case in the cable junction, these chests or on shaft tower, in piecer's well, the temperature that remove to measure their sheath circulating current, measurement cable splice and affiliated facility need spend lot of manpower and material resources.

The power cable of 35KV and above electric pressure mainly is a single core cable, and insulating sheath often is damaged in operational process, occurs or multipoint earthing fault at 2 and electric power accident takes place.In China, cable insulating sheath in laid processes suffers physical damage, in servicely is subjected to chemical corrosion, is stung the main cause that situation such as bad becomes cable fault repeatedly by mouse, termite.As the important indicator of cable running safety, cable operation maintenance department needs periodic measurement sheath circulating current and insulation resistance to guarantee cable running safety, but all there is deficiency to a certain degree in the traditional measurement method of these two indexs.

Cable sheath circulating current and insulation resistance mainly are to adopt manual method to measure at present, need the operation maintenance personnel regularly to arrive in-site measurement, record, manual analysis data then, and cable must be stopped transport during measurement insulation resistance, therefore not only time-consuming, the effort of these two kinds of methods, can't timely discovery cable sheath insulation defect.

In addition, guarantee that each protective metal shell of Voltage Cable Lines Construction has at least the good earth point in a place very important.No matter be system or cross interconnected earthed system single-end earthed, its magnetic line of force that produces because of alternating current in single core cable metal sheath and the heart yearn is hinge mutually, make its two ends higher induced voltage occur,, induced voltage is in the safe voltage scope so need take suitable grounding measures.

Usually the metal sheath of short-term road single core cable adopts the direct ground connection of an end and the other end through the gap or the mode of protective resistance ground connection; Long transmission line single core cable metal sheath then adopts the mode of the cross interconnected two-terminal-grounding of three-phase segmentation.Directly earth point is as if fail effective grounding owing to a variety of causes, the current potential of cable metal sheath will sharply be elevated to several kilovolts even 10,000 volts so, be easy to the cable jacket puncture and in the breakdown point continuous discharge, cause the cable jacket temperature to raise in addition fire burns, so both at home and abroad accident case is existing a lot.

Therefore, how to design the automatic monitoring system of a cover cable, can measure the index of cable metal sheath circulating current, cable core electric current, cable surface temperature real-time and accurately, and utilize scientific analysis method to judge the insulating sheath situation, guarantee that the cable operation is in a safe condition, accomplish on-the-spot unattended duty, having reduced the cable operation expense is problem demanding prompt solution.

[summary of the invention]

Technical matters to be solved by this invention is the automatic running status of Monitoring High Voltage Cable real-time and accurately.

For solving the problems of the technologies described above, the present invention proposes following technical scheme:

The present invention relates to a kind of on-line monitoring system for high voltage cable, comprise sensor, data acquisition unit, electricity getting device, and the webserver, wherein sensor is arranged on the high-voltage cable joint place, be used to gather the data of each monitoring point, high-voltage cable joint place and the data of gathering are sent to data acquisition unit, data acquisition unit is arranged near the high-voltage cable joint, be used for the data of pick-up transducers and send to the webserver by wireless network, electricity getting device is powered from the high-tension cable power taking and to data acquisition unit, the webserver is installed in the pulpit, be used to receive the data that data acquisition unit sends and data carried out analysis and judgement handle, but its online browse high-tension cable running state information and cable fault reported to the police.

Further, data acquisition unit comprises sensor signal receiving circuit, high tension protection circuit, A/D change-over circuit, CPU and GPRS data transmission unit DTU.

Further, comprise sheath circulating current value and core current value in the data that sensor is gathered, sensor is given data acquisition unit with these data transmission.

Further, data acquisition unit is transferred to the webserver with sheath circulating current value and core current value, and the webserver is judged these data, in order to determine the insulation situation of high-tension cable sheath.

Further, when the ratio of sheath circulating current value and core current value more than or equal to 8%, and the ratio of identical period sheath circulating current rate of change and core current changing rate is more than or equal to 1 o'clock, and the insulating sheath that is defined as high-tension cable unusual condition occurs and reports to the police.

Sheath circulating current, core electric current, cable surface temperature and ambient temperature and humidity etc. that this monitoring system can bring automatic realization that cable is moved at the scene carry out real-time supervision, and whether be in the safe operation state by specific analysis and judgement cable, so that the operation maintenance personnel grasp the ruuning situation of cable at any time, avoid electric power accident generation beneficial effect arranged.

[description of drawings]

Fig. 1 is the Organization Chart of on-line monitoring system for high voltage cable.

Fig. 2 is the structural drawing of data acquisition unit.

[embodiment]

As shown in Figure 1, a kind of on-line monitoring system for high voltage cable of the present invention comprises sensor (1), data acquisition unit (2), electricity getting device (3) and the webserver (4).Wherein sensor (1) is arranged on the high-voltage cable joint place, is used to gather the data of each monitoring point, high-voltage cable joint place and the data of gathering are sent to data acquisition unit (2).Data acquisition unit (2) is arranged near the high-voltage cable joint, is used for the data of collection site sensor (1) and sends to the webserver (4) by wireless network.Electricity getting device (3) is installed in data acquisition unit (2) side and powers to it.The webserver (4) is installed in the pulpit, and be used to receive the data that data acquisition unit sends and data carried out analysis and judgement handle, but online browse high-tension cable running state information and cable fault reported to the police.

Sensor (1):

Spot sensor detection information comprises cable surface temperature, cable sheath circulating current, cable core electric current, ambient temperature and humidity, water level, smog, harmful gas, and gives data acquisition unit (2) with these detection limits.

Data acquisition unit (2):

Data acquisition unit comprises sensor signal receiving circuit, high tension protection circuit, A/D change-over circuit, CPU and GPRS data transmission unit DTU, and the data of responsible collection site sensor (1) and send to the webserver (4) by wireless network.

Electricity getting device (3):

Electricity getting device obtains electric energy by the electric current mutual inductor that is set to the high-tension cable bus, obtains the sufficient direct current of safety by high tension protection circuit and rectification and mu balanced circuit then, for data acquisition unit (2) provides power supply.

The webserver (4):

The webserver mainly be responsible for to receive data that data acquisition unit (2) sends and data is carried out analyzing and processing, but online browse high-tension cable running state information.When the ratio of sheath circulating current value and core current value more than or equal to 8%, and the ratio of identical period sheath circulating current rate of change and core current changing rate is more than or equal to 1 o'clock, the insulating sheath that is defined as high-tension cable unusual condition occurs and reports to the police.

The operation maintenance personnel can monitor the real time data of sheath circulating current, core electric current, cable surface temperature and the ambient temperature and humidity of on-the-spot operation cable by said system, and can judge that whether cable is in the safe operation state, avoids the generation of electric power accident.

Claims (5)

1. on-line monitoring system for high voltage cable, it is characterized in that: comprise sensor (1), data acquisition unit (2), electricity getting device (3), and the webserver (4), wherein sensor (1) is arranged on the high-voltage cable joint place, be used to gather the data of each monitoring point, high-voltage cable joint place and the data of gathering are sent to data acquisition unit (2), data acquisition unit (2) is arranged near the high-voltage cable joint, be used for the data of pick-up transducers (1) and send to the webserver (4) by wireless network, electricity getting device (3) is powered from the high-tension cable power taking and to data acquisition unit, the webserver (4) is installed in the pulpit, be used to receive the data that data acquisition unit (2) sends and data carried out analysis and judgement handle, but its online browse high-tension cable running state information and cable fault reported to the police.
2. a kind of on-line monitoring system for high voltage cable as claimed in claim 1 is characterized in that: described data acquisition unit (2) comprises sensor signal receiving circuit, high tension protection circuit, A/D change-over circuit, CPU and GPRS data transmission unit DTU.
3. a kind of on-line monitoring system for high voltage cable as claimed in claim 1 is characterized in that: comprise sheath circulating current value and core current value in the data that sensor (1) is gathered, sensor (1) is given data acquisition unit with these data transmission.
4. a kind of on-line monitoring system for high voltage cable as claimed in claim 3, it is characterized in that: data acquisition unit (2) is transferred to the webserver (4) with sheath circulating current value and core current value, the webserver (4) is judged these data, in order to determine the insulation situation of high-tension cable sheath.
5. a kind of on-line monitoring system for high voltage cable as claimed in claim 4, it is characterized in that: when the ratio of sheath circulating current value and core current value more than or equal to 8% the time, and the ratio of identical period sheath circulating current rate of change and core current changing rate is more than or equal to 1 o'clock, and the insulating sheath that is defined as high-tension cable unusual condition occurs and reports to the police.
CN2009100454713A 2009-01-16 2009-01-16 On-line monitoring system for high voltage cable CN101464488B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2009100454713A CN101464488B (en) 2009-01-16 2009-01-16 On-line monitoring system for high voltage cable

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CN101464488B true CN101464488B (en) 2011-06-08

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CN102478597A (en) * 2010-11-23 2012-05-30 山东电力集团公司淄博供电公司 Intelligent monitoring device for high-voltage cable of power transmission tower
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CN103149421A (en) * 2012-09-18 2013-06-12 天津学子电力设备科技有限公司 High voltage cable metal sheath grounding current online monitoring system
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CN102620770A (en) * 2012-03-19 2012-08-01 上海市电力公司 Small-sized high-voltage cable state monitoring device
CN102620770B (en) * 2012-03-19 2014-12-10 上海市电力公司 Small-sized high-voltage cable state monitoring device

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EE01 Entry into force of recordation of patent licensing contract

Assignee: Xi'an Great Electronic Industrial Co., Ltd.

Assignor: Shanghai Welldone Electric Equipment Co., Ltd.

Contract record no.: 2012610000108

Denomination of invention: On-line monitoring system for high voltage cable

Granted publication date: 20110608

License type: Exclusive License

Open date: 20090624

Record date: 20120618

TR01 Transfer of patent right

Effective date of registration: 20160114

Address after: 200436 3 floor, No. three, No. 307, Jiangdu Road, Shanghai

Patentee after: Shanghai Welldone Electric Equipment Co., Ltd.

Patentee after: State Grid Fujian Electric Power Co., Ltd.

Patentee after: State Grid Corporation of China

Patentee after: XIAMEN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID FUJIAN ELECTRIC POWER CO. LTD.

Address before: 200436 3 floor, No. three, No. 307, Jiangdu Road, Shanghai

Patentee before: Shanghai Welldone Electric Equipment Co., Ltd.

C41 Transfer of patent application or patent right or utility model