CN202502133U - Online monitoring apparatus for cable sheath grounding currents - Google Patents

Online monitoring apparatus for cable sheath grounding currents Download PDF

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Publication number
CN202502133U
CN202502133U CN2012201134739U CN201220113473U CN202502133U CN 202502133 U CN202502133 U CN 202502133U CN 2012201134739 U CN2012201134739 U CN 2012201134739U CN 201220113473 U CN201220113473 U CN 201220113473U CN 202502133 U CN202502133 U CN 202502133U
Authority
CN
China
Prior art keywords
monitoring
data acquisition
cable
power supply
cable sheath
Prior art date
Application number
CN2012201134739U
Other languages
Chinese (zh)
Inventor
贺林
李红雷
黄华炜
Original Assignee
上海市电力公司
华东电力试验研究院有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 上海市电力公司, 华东电力试验研究院有限公司 filed Critical 上海市电力公司
Priority to CN2012201134739U priority Critical patent/CN202502133U/en
Application granted granted Critical
Publication of CN202502133U publication Critical patent/CN202502133U/en

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Abstract

The utility model relates to an online monitoring apparatus for cable sheath grounding currents, wherein the online monitoring apparatus comprises a monitoring data collection terminal, a monitoring host, a centralized control server, an on-scene power supply unit and an alarm unit. Specifically, the monitoring host is respectively connected with the centralized control server, the monitoring data collection terminal and the alarm unit; the on-scene power supply unit is connected with the monitoring data collection terminal. Compared with the prior art, the technology employed in the utility model enables a problem of substantial increasing of induced circulating currents of the sheath to be well solved.

Description

A kind of cable sheath ground current on-Line Monitor Device

Technical field

The utility model relates to a kind of monitoring device of electric field, especially relates to a kind of cable sheath ground current on-Line Monitor Device.

Background technology

When core short circuit, the short circuit of sheath overvoltage protection device inside and outside cable generation metal sheath ground connection, the transposition concentric cable, transposition case/faults such as ground connection case pilferage, can cause sheath induction circulation to enlarge markedly.Therefore, through the electric current that flows through on the monitoring sheath ground wire, can realize on-line monitoring to sheath transposition, protection system and cable jacket insulation fault.

Number of patent application is: 201020002484.0; The applying date is: on January 11st, 2010; The name of innovation and creation is called " state monitoring and analysis system of power cable sheath grounding current "; This application case discloses a kind of device, and this device comprises application server, it is connected with data browser respectively at explorer, front-end control machine, monitoring management station, voice management device, short message managing device; The front-end control machine is connected with at least one monitoring host computer, can connect 255 at most, and monitoring host computer then is connected with at least one data acquisition equipment, and maximum limit is relevant with actual laying-out.Application server is the kernel software module, has only when application server normally moves, and other software modules could correct work, can not direct communication between other modules, and their contact all comes transfer through application server.This application case can detect the power cable running status automatically, thereby for assessing the power cable running status whether strong guarantee is provided well; Also can failure message be notified to the maintainer with multiple alarm form in time simultaneously.But it does not solve the problem that sheath induction circulation enlarges markedly well.

The utility model content

The purpose of the utility model is exactly to provide a kind of for the defective that overcomes above-mentioned prior art existence can solve the cable sheath ground current on-Line Monitor Device that sheath induction circulation enlarges markedly problem well.

The purpose of the utility model can realize through following technical scheme:

A kind of cable sheath ground current on-Line Monitor Device; It is characterized in that; Comprise Monitoring Data acquisition terminal, monitoring main frame, collection control server, on-the-spot power supply unit and alarm unit; Described monitoring main frame connects collection control server, Monitoring Data acquisition terminal and alarm unit respectively, and described on-the-spot power supply unit connects the Monitoring Data acquisition terminal.

Described Monitoring Data acquisition terminal comprises data acquisition unit, circulating current sensor, running current sensor and cable temperature sensor; Described data acquisition unit connects current sensor, running current sensor and cable temperature sensor respectively, and described data acquisition unit is connected with the monitoring main frame.

Compared with prior art, the utlity model has and to solve the advantage that sheath induction circulation enlarges markedly problem well.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among the figure: 1-collection control server, 2-monitors main frame, 3-alarm unit, the on-the-spot power supply unit of 4-, 5-data acquisition unit, 6-circulating current sensor, 7-running current sensor, 8-cable temperature sensor, 9-Monitoring Data acquisition terminal.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.

Embodiment

As shown in Figure 1; A kind of cable sheath ground current on-Line Monitor Device; Comprise Monitoring Data acquisition terminal 9, monitoring main frame 2, collection control server 1, on-the-spot power supply unit 4 and alarm unit 3; Described monitoring main frame 2 connects collection control server 1 and Monitoring Data acquisition terminal 9 respectively, and described on-the-spot power supply unit 4 connects Monitoring Data acquisition terminal 9, and described alarm unit 3 connects monitoring main frame 2.

Described Monitoring Data acquisition terminal 9 comprises data acquisition unit 5, circulating current sensor 6, running current sensor 7 and cable temperature sensor 8, and described data acquisition unit 5 connects current sensor 6, running current sensor 7 and cable temperature sensor 8 respectively.

Monitoring main frame 2 can place transformer station indoor, realize to the circulating current data carry out communication acquisition, gather, functions such as warning, teletransmission reception, transmission, between collection control server 1 and data acquisition unit 5, play transmission, transitional function.Monitoring main frame 2 obtains current data through wireless telecommunications or optical-fibre communications from data acquisition unit 5; And with the data of collecting classify, operations such as calculating, analysis, demonstration, storage, printing, warning, the data after will handling simultaneously are sent to collection control server 1.It is complete that monitoring main frame 2 can select for use industrial computer or generic server to dispose, and disposes according to the system scale flexible in size.

Circulating current sensor 6 has higher precision, is sleeved on the cable grounding line, will export from secondary terminals from the current signal that ground wire is sensed.The 10-15 of the normal circulation value of general optional power taking cable should guarantee better linearity proportionate relationship under the little electric current doubly as range ability, guarantees the saturated conditions under the big electric current again.

The range ability of running current sensor 7 is confirmed according to the cable design current-carrying capacity, on cable, installs additional and measures CT.Cable sheath circulation size changes with the cable load electric current, therefore must measure in real time the cable running current, in time calculates the ratio relation of metal sheath circulation.

Cable temperature sensor 8 is monitored the cable surface temperature variation under the different running currents in real time, the corresponding relation between monitoring sheath circulation size and the cable heating, and can be used as the supplementary means of confirming the fault occurrence positions.

Data acquisition unit 5 converts the current signal of current sensor input to voltage signal; After filtering, amplification, amplitude limiting processing; Through digital collection system acquisition, calculating, corresponding data are sent to electrical substation monitoring main frame 2 through wireless or optical-fibre communications module again.

Data acquisition unit 5 should have stronger antijamming capability and self-protection function, and should confirm corresponding water proof and dust proof grade according to installation environment.

Power supply mode commonly used at present has the field power supply power supply, gets ability CT power supply, solar powered, storage battery power supply.Wherein field power supply and solar powered mode receive the site environment restriction bigger, get relatively complicacy of ability CT power supply, and storage battery power supply is the most simple.Adopt the storage battery power supply mode need in use safeguard, change, this just requires in the cable line design process, as far as possible ground connection case, transposition case to be placed ground, for the maintenance of on-line monitoring system is provided convenience.

The alarm parameters of on-Line Monitor Device comprises:

(a) absolute value is reported to the police: according to line voltage distribution grade, design current-carrying capacity, earthing mode, confirm the maximum permissible value of circulating current, find when monitoring device that ground current surpasses and will report to the police automatically when this value or system lose ground connection.

(b) ratio is reported to the police: calculate the ratio of actual measurement circulating current and cable load electric current, as surpassing the allowed band of design, then system reports to the police automatically.

(c) variation tendency is reported to the police: through continuous coverage and calculating, obtain the variation tendency of ground current absolute value and ground current and load current ratio, surpass setting value like rate of change, system reports to the police automatically.

The type of alarm of system generally comprises: sound/light is reported to the police, is sent alert data, sends warning message (as passing through SMS) to the related personnel to collection control server in the transformer station.

Claims (2)

1. cable sheath ground current on-Line Monitor Device; It is characterized in that; Comprise Monitoring Data acquisition terminal, monitoring main frame, collection control server, on-the-spot power supply unit and alarm unit; Described monitoring main frame connects collection control server, Monitoring Data acquisition terminal and alarm unit respectively, and described on-the-spot power supply unit connects the Monitoring Data acquisition terminal.
2. a kind of cable sheath ground current on-Line Monitor Device according to claim 1; It is characterized in that; Described Monitoring Data acquisition terminal comprises data acquisition unit, circulating current sensor, running current sensor and cable temperature sensor; Described data acquisition unit connects current sensor, running current sensor and cable temperature sensor respectively, and described data acquisition unit is connected with the monitoring main frame.
CN2012201134739U 2012-03-22 2012-03-22 Online monitoring apparatus for cable sheath grounding currents CN202502133U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012201134739U CN202502133U (en) 2012-03-22 2012-03-22 Online monitoring apparatus for cable sheath grounding currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012201134739U CN202502133U (en) 2012-03-22 2012-03-22 Online monitoring apparatus for cable sheath grounding currents

Publications (1)

Publication Number Publication Date
CN202502133U true CN202502133U (en) 2012-10-24

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Application Number Title Priority Date Filing Date
CN2012201134739U CN202502133U (en) 2012-03-22 2012-03-22 Online monitoring apparatus for cable sheath grounding currents

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CN (1) CN202502133U (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103308744A (en) * 2013-05-28 2013-09-18 国家电网公司 Leakage current detector for ground wire of high-voltage cable shielding net
CN103344885A (en) * 2013-07-16 2013-10-09 国家电网公司 High-voltage single-core cable protective covering grounding online monitoring device and control method
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
CN103941161A (en) * 2014-05-12 2014-07-23 国家电网公司 On-line monitoring system for current and carrying capacity of cable sheath
WO2015143885A1 (en) * 2014-03-28 2015-10-01 江苏省电力公司常州供电公司 Power cable intelligent grounding box
CN105118204A (en) * 2015-07-16 2015-12-02 国网上海市电力公司 Antitheft system of high-voltage insulation head protection layer transposition box
CN105807179A (en) * 2014-12-31 2016-07-27 保定华电电气有限公司 Insulation monitoring device for high-voltage cable sheath

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103308744A (en) * 2013-05-28 2013-09-18 国家电网公司 Leakage current detector for ground wire of high-voltage cable shielding net
CN103308744B (en) * 2013-05-28 2015-07-29 国家电网公司 High-tension cable gauze screen ground wire leakage current detector
CN103344885A (en) * 2013-07-16 2013-10-09 国家电网公司 High-voltage single-core cable protective covering grounding online monitoring device and control method
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
WO2015143885A1 (en) * 2014-03-28 2015-10-01 江苏省电力公司常州供电公司 Power cable intelligent grounding box
CN103941161A (en) * 2014-05-12 2014-07-23 国家电网公司 On-line monitoring system for current and carrying capacity of cable sheath
CN105807179A (en) * 2014-12-31 2016-07-27 保定华电电气有限公司 Insulation monitoring device for high-voltage cable sheath
CN105118204A (en) * 2015-07-16 2015-12-02 国网上海市电力公司 Antitheft system of high-voltage insulation head protection layer transposition box

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