CN202126470U - Power cable insulation online monitoring device - Google Patents

Power cable insulation online monitoring device Download PDF

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Publication number
CN202126470U
CN202126470U CN2011201331569U CN201120133156U CN202126470U CN 202126470 U CN202126470 U CN 202126470U CN 2011201331569 U CN2011201331569 U CN 2011201331569U CN 201120133156 U CN201120133156 U CN 201120133156U CN 202126470 U CN202126470 U CN 202126470U
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CN
China
Prior art keywords
power cable
insulation
processing module
display unit
online monitoring
Prior art date
Application number
CN2011201331569U
Other languages
Chinese (zh)
Inventor
许征鹏
Original Assignee
许征鹏
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Filing date
Publication date
Application filed by 许征鹏 filed Critical 许征鹏
Priority to CN2011201331569U priority Critical patent/CN202126470U/en
Application granted granted Critical
Publication of CN202126470U publication Critical patent/CN202126470U/en

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Abstract

The utility model discloses a power cable insulation online monitoring device, which is composed of a grounding zero sequence transformer (1), a processing module (2), a display unit (3) and a communication serial port (4). A power cable shielding layer grounding line penetrates through the middle of the grounding zero sequence transformer (1) to be connected with the processing module (2). The processing module (2) transmits measured information and alarm signals to the display unit (3) in real time and to a backstage microcomputer (5) through the communication serial port (4). The other end of the power cable shielding layer grounding line is connected with the ground by being connected with a low voltage arrester. The processing module (2) of the power cable insulation online monitoring device judges insulation resistances of the cable according to leakage current of the power cable, change of power factor in the leakage current and zero sequence voltage. The power cable insulation online monitoring device has the advantages of being capable of monitoring insulation states and removing insulation hidden troubles in real time, mastering insulation aging tendency, avoiding power-off effects caused by off-line test, and reducing test expenditure under normal operation state of the power cable.

Description

The power cable insulation on-Line Monitor Device

Affiliated technical field

The utility model belongs to power equipment insulation detection range, relates to a kind of insulation line monitoring device, specially refers to a kind of power cable insulation on-Line Monitor Device.

Background technology

Continuous development along with electric utility; The quantity of power cable sharply increases, and power cable puts the back into operation because circumstance complication of living in is difficult in maintenance; Receive the insulation ag(e)ing damage takes place under the environmental change factor affecting such as electricity, heat, machinery, be difficult to detect in case hidden danger occurs.Power cable then probably develops into single-phase earthing even phase fault because insulation ag(e)ing or other reasons cause discharge over the ground, influences system's normal power supply.Traditional way is regularly to do preventive trial, but this way exists: 1, because the difference of preventive trial and actual motion condition can not detect the actual hidden danger of cable strictly according to the facts; 2, test period length can not in time scent a hidden danger and insulation ag(e)ing trend, causes accident to take place; 3, offline inspection needs the equipment shortcomings such as power supply continuity that influence out of service.

Summary of the invention

The purpose of the utility model is to provide a kind of power cable under normal operating condition, monitors its state of insulation investigation insulation hidden danger in real time, grasps insulation ag(e)ing trend, and the power failure of avoiding offline inspection to bring influences and reduce a kind of device of testing expenses.Thereby come the present insulation status of the tested cable of correct diagnosis according to the information that monitors, according to insulation itself characteristics and variation tendency etc. confirm to continue operation and formulation turnaround plan.

The utility model is to overcome the above problems the technical scheme that is adopted to be: this device, by the ground connection ZCT 1., processing module 2., display unit 3., 4. the communication serial ports form.The ground connection ZCT is 1. middle to be installed with power cable shielding layer grounding line, and the connection processing module 2., and 3. 2. processing module send to display unit with measured information and alerting signal in real time, and 4. send to the backstage microcomputer 5. through the communication serial ports.In system with non-effectively earthed neutral, normal cable to vagabond current in owing to be that the neutral point voltage skew causes, the electric current under this moment inflow place belongs to reactive current.If destruction has been suffered in the cable insulation against ground, can cause the neutral point voltage skew equally, residual voltage can appear in this moment, and the electric current under the inflow place will be an active current, and significant change can take place in power factor, and leakage current strengthens.2. processing module is judged according to above condition through the 1. measured signal of ground connection ZCT; When residual voltage surpasses designated value; Or leakage current surpasses designated value, simultaneously the zero-sequence current power factor surpass 0.25 or during designated value processing module judge then 2. that this cable insulation breaks down and give the alarm.3. 2. processing module send to display unit with measured information and alerting signal in real time, and 4. send to the backstage microcomputer 5. through the communication serial ports.A backstage microcomputer can connect many power cable insulation on-Line Monitor Device, monitoring many line insulation states simultaneously, and can be connected to the power-management centre through optical cable or LAN.

Bonding line with power cable during use passes 1. ground connection of ground connection ZCT; 2. processing module connects three-phase PT voltage; The other end bonding line of power cable is through 6. ground connection of low voltage surge arrester, display unit 3. with the backstage microcomputer 5. can two kinds while usefulness all, also can select wherein a kind of; 3. display unit shows usefulness as on-the-spot single channel, and the backstage microcomputer is 5. as usefulness such as centralized displaying.

It is a kind of that the advantage of the utility model is to provide: power cable is under normal operating condition; Accurately its state of insulation of monitoring is investigated insulation hidden danger in real time; Grasp insulation ag(e)ing trend, the power failure of avoiding offline inspection to bring influences and reduces the power cable insulation on-Line Monitor Device of testing expenses.

Description of drawings

Accompanying drawing is the connection synoptic diagram of the utility model.

1: the ground connection ZCT; 2: processing module; 3: display unit; 4: the communication serial ports; 5: the backstage microcomputer; 6: low voltage surge arrester.

Embodiment

According to accompanying drawing the utility model by by the ground connection ZCT 1., processing module 2., display unit 3., 4. the communication serial ports form.2. the accurate punching mutual inductor that 1. the ground connection ZCT adopts the rich solenoid of amorphous alloy iron core to process connects as one with processing module, is fixedly installed on the power distribution cabinet electric support.During use with an end shield ground wire cross-under of power cable cable ground ZCT 1.; Reliably be connected with the earth; The other end bonding line of one power cable is after 6. 2. ground connection (can be directly unsettled like short this termination ground wire of cable length) processing module is handled the signal of being surveyed through single-chip microcomputer through low voltage surge arrester; 4. the communication serial ports that passes through of practical work sends to the backstage microcomputer and 5. and through rigid line is sent to display unit 3., and 3. 5. the backstage microcomputer can be used with display unit simultaneously, also can only select one of which; Display unit can make 3. that suspension type is installed or embedded mounting structure all can, be fixedly installed in electric equipment and be convenient to the position of observing and operating.5. on-the-spot unwatched distribution substation can only select the backstage microcomputer; 4. many power cable insulation on-Line Monitor Device in scene are connected through the communication serial ports; Many cables to the scene are maked an inspection tour through software; And can on the backstage, set up the insulation historical trend of each bar cable of database analysis, can also be connected to the power-management centre through network or optical cable.The less unit of number of cables invests for practicing thrift, and can only display unit be installed at the scene 3., and the insulation information of cable can be through checking on the spot.The scene also often the someone make an inspection tour, unit cable quantity is also more, suggestion install simultaneously display unit 3. with the backstage microcomputer 5. so that to the monitoring of operation cable insulation information.Processing module working power 2. can provide through homologous system PT.Processing module alarm threshold value 2. is in factory's preset in advance, also can be on-the-spot through display unit 3. or the backstage microcomputer revise after 5. inputing password, the insulation resistance of cable can obtain divided by ground connection zero-sequence current power factor through voltage.When the numerical value that 2. 1. the ground connection ZCT monitor with processing module meets or exceeds alarm threshold value is set, promptly send alerting signal, display unit sends the sound and light alarm prompting after 3. 5. receiving alerting signal with the backstage microcomputer.

Claims (2)

1. power cable insulation on-Line Monitor Device; Form by ground connection ZCT (1), processing module (2), display unit (3), communication serial ports (4); It is characterized in that being installed with power cable shielding layer grounding line in the middle of the ground connection ZCT (1); And connection processing module (2), processing module (2) sends to display unit (3) in real time with measured information and alerting signal, and sends to backstage microcomputer (5) through communication serial ports (4).
2. power cable insulation on-Line Monitor Device according to claim 1, its characteristic are that also the other end of said power cable shielding layer grounding line is through connecting low voltage surge arrester ground connection.
CN2011201331569U 2011-04-24 2011-04-24 Power cable insulation online monitoring device CN202126470U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201331569U CN202126470U (en) 2011-04-24 2011-04-24 Power cable insulation online monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011201331569U CN202126470U (en) 2011-04-24 2011-04-24 Power cable insulation online monitoring device

Publications (1)

Publication Number Publication Date
CN202126470U true CN202126470U (en) 2012-01-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011201331569U CN202126470U (en) 2011-04-24 2011-04-24 Power cable insulation online monitoring device

Country Status (1)

Country Link
CN (1) CN202126470U (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
CN103389437A (en) * 2013-07-31 2013-11-13 国家电网公司 Device and method for monitoring shielding current of secondary control cable of transformer substation in real time
CN103558486A (en) * 2013-11-19 2014-02-05 国家电网公司 Lightning arrester with line ageing monitoring function
CN104267302A (en) * 2014-09-02 2015-01-07 山东中泰阳光电气科技有限公司 Online monitoring system based on tubular busbar
CN105866638A (en) * 2016-04-08 2016-08-17 重庆大学 City network cable joint insulation state online monitoring apparatus early warning apparatus and method
CN108152652A (en) * 2017-12-28 2018-06-12 合肥工大高科信息科技股份有限公司 A kind of cable insulation test method
CN110346677A (en) * 2019-07-15 2019-10-18 国网北京市电力公司 The determination method and apparatus and aging equipment of state in cable ageing process

Cited By (11)

* 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
CN103389437A (en) * 2013-07-31 2013-11-13 国家电网公司 Device and method for monitoring shielding current of secondary control cable of transformer substation in real time
CN103558486A (en) * 2013-11-19 2014-02-05 国家电网公司 Lightning arrester with line ageing monitoring function
CN103558486B (en) * 2013-11-19 2017-01-04 国家电网公司 One has monitoring aging circuit function spark gap
CN104267302A (en) * 2014-09-02 2015-01-07 山东中泰阳光电气科技有限公司 Online monitoring system based on tubular busbar
CN104267302B (en) * 2014-09-02 2017-01-25 山东中泰阳光电气科技有限公司 Online monitoring system based on tubular busbar
CN105866638A (en) * 2016-04-08 2016-08-17 重庆大学 City network cable joint insulation state online monitoring apparatus early warning apparatus and method
CN105866638B (en) * 2016-04-08 2018-08-14 重庆大学 A kind of city net cable connector state of insulation on-line monitoring prior-warning device and method
CN108152652A (en) * 2017-12-28 2018-06-12 合肥工大高科信息科技股份有限公司 A kind of cable insulation test method
CN110346677A (en) * 2019-07-15 2019-10-18 国网北京市电力公司 The determination method and apparatus and aging equipment of state in cable ageing process

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120125

Termination date: 20130424