CN204649899U - Small current grounding failure wire selection system in a kind of dispatching of power netwoks - Google Patents

Small current grounding failure wire selection system in a kind of dispatching of power netwoks Download PDF

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Publication number
CN204649899U
CN204649899U CN201520417833.8U CN201520417833U CN204649899U CN 204649899 U CN204649899 U CN 204649899U CN 201520417833 U CN201520417833 U CN 201520417833U CN 204649899 U CN204649899 U CN 204649899U
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CN
China
Prior art keywords
selection
mutual inductor
zero sequence
switching
sequence current
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
CN201520417833.8U
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Chinese (zh)
Inventor
任之豪
宋俊峰
马建伟
孙鑫富
宋欣勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guo Wang Rushan Shandong Province City Electric Co
State Grid Corp of China SGCC
Original Assignee
Guo Wang Rushan Shandong Province City Electric Co
State Grid Corp of China SGCC
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Publication date
Application filed by Guo Wang Rushan Shandong Province City Electric Co, State Grid Corp of China SGCC filed Critical Guo Wang Rushan Shandong Province City Electric Co
Priority to CN201520417833.8U priority Critical patent/CN204649899U/en
Application granted granted Critical
Publication of CN204649899U publication Critical patent/CN204649899U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model proposes the small current grounding failure wire selection system in a kind of dispatching of power netwoks, comprise bus, bus has some outlets under its command, every bar outlet is equipped with switching off/on device, zero sequence current mutual inductor is equipped with at the leading-out terminal of each switching off/on device, the leading-out terminal of zero sequence current mutual inductor is provided with user load, the other end ground connection of user load; Bus is provided with voltage transformer (VT); secondary and each zero sequence current mutual inductor of voltage transformer (VT) are all connected with line selection apparatus; line selection apparatus also with microcomputer protecting device, monitor treating apparatus and memory storage is connected; microcomputer protecting device is also connected with each zero sequence current mutual inductor respectively, and monitoring treating apparatus is also connected with microcomputer protecting device and each switching off/on device respectively.Above-mentioned small current grounding failure wire selection system, when route selection mistake, microcomputer protecting device energy Timeliness coverage; Arranging of memory storage can provide historical failure record as a reference, substantially increases the accuracy rate of route selection.

Description

Small current grounding failure wire selection system in a kind of dispatching of power netwoks
Technical field
The utility model relates to power domain, particularly relates to the small current grounding failure wire selection system in a kind of dispatching of power netwoks.
Background technology
In dispatching of power netwoks, in 6 ~ 66KV power distribution network, generally adopt isolated neutral or neutral point through the mode of extinguisher ground connection.At present, probability accounting in total failare of power distribution network generation singlephase earth fault is heavy comparatively large, when there is singlephase earth fault, can not form short-circuit loop, only cause very little earth-fault current by the distributed capacitance of system, therefore the low current grounding that is otherwise known as.Line voltage now between system three-phase remains unchanged substantially, load is powered and can not be impacted, but due to healthy phases voltage-to-ground rising during ground connection, particularly during intermittent arc grounding fault, arc overvoltage can be produced, serious harm system insulation and device security.Meanwhile, superpotential may cause earth fault to be converted into phase fault, makes line tripping, causes power failure.
Mostly simple line selection apparatus is configured in circuit of current existing low current fault wire selection system, line selection apparatus is only relied on to judge the circuit broken down, adopt route selection accuracy rate in this way not high, if error in judgement, non-fault line power failure can be caused, affect the normal operation of user power utilization equipment, make troubles to the life of people.
Utility model content
In order to overcome the deficiencies in the prior art, the utility model proposes the small current grounding failure wire selection system in a kind of dispatching of power netwoks, so that can Timeliness coverage when route selection mistake; And the accuracy rate of route selection is increased.
To achieve these goals, the utility model proposes the small current grounding failure wire selection system in a kind of dispatching of power netwoks, comprise bus, described bus has some outlets under its command, every bar outlet is equipped with switching off/on device, be equipped with zero sequence current mutual inductor at the leading-out terminal of each switching off/on device, the leading-out terminal of described zero sequence current mutual inductor is provided with user load, the other end ground connection of described user load; Described bus is provided with voltage transformer (VT); secondary and each zero sequence current mutual inductor of described voltage transformer (VT) are all connected with line selection apparatus; described line selection apparatus also with microcomputer protecting device, monitor treating apparatus and memory storage is connected; described microcomputer protecting device is also connected with each zero sequence current mutual inductor respectively, and described monitoring treating apparatus is also connected with described microcomputer protecting device and each switching off/on device respectively.
Preferably, described switching off/on device is switch cubicle.
The beneficial effect of the program of the present utility model is that above-mentioned small current grounding failure wire selection system is connected microcomputer protecting device in the loop of line selection apparatus and zero sequence current mutual inductor, and when line selection apparatus route selection mistake, microcomputer protecting device can Timeliness coverage; The setting of memory storage simultaneously when carrying out route selection and judging, can provide historical failure record as a reference, substantially increases the accuracy rate of route selection, avoid the power failure that error in judgement causes, and has ensured the stability of user power utilization.
Accompanying drawing explanation
Fig. 1 shows the principle schematic of the small current grounding failure wire selection system in the dispatching of power netwoks involved by the utility model.
Reference numeral: 1-bus, 2-switching off/on device, 3-user load, 4-zero sequence current mutual inductor, 5-voltage transformer (VT), 6-line selection apparatus, 7-microcomputer protecting device, 8-monitors treating apparatus, 9-memory storage.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described.
As shown in Figure 1, small current grounding failure wire selection system in dispatching of power netwoks involved by the utility model comprises bus 1, described bus 1 has some outlets under its command, every bar outlet is equipped with switching off/on device 2, described switching off/on device 2 can adopt switch cubicle, be equipped with zero sequence current mutual inductor 4 at the leading-out terminal of each switching off/on device 2, the leading-out terminal of described zero sequence current mutual inductor 4 is provided with user load 3, the other end ground connection of described user load 3; Described bus 1 is provided with voltage transformer (VT) 5; secondary and each zero sequence current mutual inductor 4 of described voltage transformer (VT) 5 are all connected with line selection apparatus 6; described line selection apparatus 6 also with microcomputer protecting device 7, monitor treating apparatus 8 and memory storage 9 is connected; described microcomputer protecting device 7 is also connected with each zero sequence current mutual inductor 4 respectively, and described monitoring treating apparatus 8 is also connected with described microcomputer protecting device 7 and each switching off/on device 2 respectively.
In the concrete course of work, the magnitude of voltage that described line selection apparatus 6 can obtain described voltage transformer (VT) 5 and zero sequence current mutual inductor 4 and current value carry out perception, when above-mentioned numerical value sudden change, line selection apparatus 6 can be triggered and carry out route selection judgement, historical failure data in described memory storage 9 and current magnitude of voltage and/or current value contrast by described line selection apparatus 6, thus judge the fault type in circuit, and then judge concrete faulty line.
Route selection result is sent to described monitoring treating apparatus 8 by described line selection apparatus 6, and described monitoring treating apparatus 8 controls described switching off/on device 2 disengagement failure circuit.When described line selection apparatus 6 route selection mistake; regular link is cut off by switching off/on device 2 by described monitoring treating apparatus 8; in the loop be now made up of described zero sequence current mutual inductor 4, microcomputer protecting device 7 and line selection apparatus 6, zero-sequence current can increase; described microcomputer protecting device 7 can judge line selection apparatus 6 route selection mistake; described microcomputer protecting device 7 can trigger the judgement of described monitoring treating apparatus 8 to mistake and recovers afterwards; again to the line powering of normal work, to avoid the electricity consumption affecting user.
Small current grounding failure wire selection system in dispatching of power netwoks involved by the utility model, microcomputer protecting device 7 of connecting in the loop of line selection apparatus 6 and zero sequence current mutual inductor 4, when line selection apparatus 6 route selection mistake, microcomputer protecting device 7 can Timeliness coverage; The setting of memory storage 9 simultaneously when carrying out route selection and judging, can provide historical failure record as a reference, substantially increases the accuracy rate of route selection, avoid the power failure that error in judgement causes, and has ensured the stability of user power utilization.

Claims (2)

1. the small current grounding failure wire selection system in a dispatching of power netwoks, it is characterized in that: comprise bus, described bus has some outlets under its command, every bar outlet is equipped with switching off/on device, zero sequence current mutual inductor is equipped with at the leading-out terminal of each switching off/on device, the leading-out terminal of described zero sequence current mutual inductor is provided with user load, the other end ground connection of described user load; Described bus is provided with voltage transformer (VT); secondary and each zero sequence current mutual inductor of described voltage transformer (VT) are all connected with line selection apparatus; described line selection apparatus also with microcomputer protecting device, monitor treating apparatus and memory storage is connected; described microcomputer protecting device is also connected with each zero sequence current mutual inductor respectively, and described monitoring treating apparatus is also connected with described microcomputer protecting device and each switching off/on device respectively.
2. the small current grounding failure wire selection system in dispatching of power netwoks according to claim 1, is characterized in that: described switching off/on device is switch cubicle.
CN201520417833.8U 2015-06-17 2015-06-17 Small current grounding failure wire selection system in a kind of dispatching of power netwoks Expired - Fee Related CN204649899U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520417833.8U CN204649899U (en) 2015-06-17 2015-06-17 Small current grounding failure wire selection system in a kind of dispatching of power netwoks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520417833.8U CN204649899U (en) 2015-06-17 2015-06-17 Small current grounding failure wire selection system in a kind of dispatching of power netwoks

Publications (1)

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CN204649899U true CN204649899U (en) 2015-09-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106405306A (en) * 2016-08-02 2017-02-15 辽宁拓新电力电子有限公司 Low excitation impedance transformer grounding protection apparatus and method thereof
CN107037322A (en) * 2017-04-14 2017-08-11 积成电子股份有限公司 Power distribution network low current grounding localization method based on steady state characteristic

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106405306A (en) * 2016-08-02 2017-02-15 辽宁拓新电力电子有限公司 Low excitation impedance transformer grounding protection apparatus and method thereof
CN107037322A (en) * 2017-04-14 2017-08-11 积成电子股份有限公司 Power distribution network low current grounding localization method based on steady state characteristic
CN107037322B (en) * 2017-04-14 2019-12-17 积成电子股份有限公司 power distribution network low-current grounding fault positioning method based on steady-state characteristics

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150916

Termination date: 20170617

CF01 Termination of patent right due to non-payment of annual fee