CN103001194A - On-line line fault monitoring and protection device and protection method thereof - Google Patents
On-line line fault monitoring and protection device and protection method thereof Download PDFInfo
- Publication number
- CN103001194A CN103001194A CN2012105584749A CN201210558474A CN103001194A CN 103001194 A CN103001194 A CN 103001194A CN 2012105584749 A CN2012105584749 A CN 2012105584749A CN 201210558474 A CN201210558474 A CN 201210558474A CN 103001194 A CN103001194 A CN 103001194A
- Authority
- CN
- China
- Prior art keywords
- control unit
- phase
- ground
- protection control
- links
- 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.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an on-line line fault monitoring and protection device and a protection method thereof. The on-line line fault monitoring and protection device comprises a split-phase breaker which is connected with a disconnecting switch connected with a transformer substation bus connected with a potential transformer (PT) cabinet. The split-phase breaker is respectively connected with a low-impedance electric reactor and a ground protection control unit, and the low-impedance electric reactor is connected with a current transformer which is connected with a first grounding grid. The ground protection control unit is respectively connected with the low-impedance electric reactor, the current transformer and the PT cabinet. The transformer substation bus is connected with a second grounding grid. The split-phase breaker, the low-impedance electric reactor and the current transformer are effectively connected to rapidly find out fault points, personal safety of maintenance personnel is guaranteed, trouble removal efficiency is greatly improved, and normal power utilization of residents can be guaranteed.
Description
?
Technical field
The present invention relates to a kind of online line fault monitoring and protective device and guard method thereof.
?
Background technology
At present, the neutral operation method of electric power system has two large types, and one is directly grounded ground current system, in addition is earth-free or through the small grounding current system of grounding through arc or resistance grounded.
Above two kinds of systems are because earthing mode is different, and then operation characteristic is also thereupon different: the former can produce very large short circuit current when system's generation single-phase earthing, and does not allow for a long time operation in system of single-phase fault point; Earth-free or compensated distribution network, when system's generation single-phase earthing, the earth current that produces is not very large, capacitive earth current for system, simultaneity factor line voltage preserved symmetry does not affect user's normal electricity consumption, so allow single-phase earthing point long-play in system, can reduce the system blackout number of times, improve power supply reliability.
Just because of small grounding current system has the characteristic of moving with single-phase earthing point for a long time, showed the good one side to user's uninterrupted power supply, thereby in the electrical network of 3.3kV, 6kV, 10kV, 35kV, 66kV, obtained general propagation and employment.But because system lacks the protective capability to single phase ground fault, there are many weak points in the runnability of system, is mainly manifested in following seven aspects:
(1) to extinguish the ground arc ability low in system.
(2) compensated distribution network is subjected to arc suppression coil entirely to compensate the restriction of resonance overvoltage, and earth point still has residual flow, and ground arc is still existed.
(3) if personal single-phase electrification occurs, because system makes the electrification personnel can not break away from fast power supply uninterruptedly to the earth point power supply, under the long duration of action of system's capacitive earth current, can cause personal injury accident.
(4) if ground connection is intermittent, again can the initiating system overvoltage, the accident of burning electric equipment.
(5) the GIS combined electrical apparatus is inner when single-phase earthing occurs, if find untimelyly, electric arc is at inner burned for long time, and casing can produce very large pressure, and its consequence is very fearful.
(6) system of Neutral Grounding through Resistance in Electrical, when system's generation single-phase earthing, the electric current that earth point is flow through in control is about 500A, and what also have is controlled at about 100A.Start the zero-sequenceprotection action by the electric current that flows through earth point, the excision faulty line.No matter be nonvolatil or volatile, all act on tripping operation, the tripping operation number of times of circuit is increased greatly, had a strong impact on user's normal power supply, its power supply reliability is descended.
(7) general supply line more complicated, the fault point search relatively difficulty, fault is got rid of need to expend a large amount of human resources, and can not promptly and accurately find the fault point.
Summary of the invention
For addressing the above problem; the object of the present invention is to provide a kind of online line fault monitoring and protective device and guard method thereof; adopt effective connection of phase-splitting circuit breaker, Low ESR reactor, current transformer; can find out fast the fault point; when guaranteeing maintenance personal's personal safety; greatly improve fault removal efficiency, guaranteed resident's normal electricity consumption.
The present invention is the purpose that reaches above-mentioned, and the present invention adopts following technical scheme:
A kind of online line fault monitoring and protective device comprise the phase-splitting circuit breaker, and described phase-splitting circuit breaker links to each other with isolating switch, and isolating switch links to each other with substation bus bar, and described substation bus bar links to each other with the PT cabinet; Described phase-splitting circuit breaker links to each other with Low ESR reactor, ground protection control unit respectively, and described Low ESR reactor links to each other with current transformer, and current transformer links to each other with the first ground network; Described ground protection control unit links to each other with Low ESR reactor, current transformer, PT cabinet respectively; Described substation bus bar links to each other with the second ground network.
Described ground protection control unit adopts the single-chip microcomputer of many CPU.
The guard method of a kind of online line fault monitoring and protective device comprise the steps: that at first the ground protection control unit passes through the voltage that the PT cabinet gathers substation bus bar, and the ground protection control unit gathers the electric current of current transformer simultaneously; Then gather the three-phase of substation bus bar according to the ground protection control unit, line and residual voltage value, by the computing system three-phase, the amplitude of line and residual voltage and angle each other change judges whether system single phase ground fault occurs; When the ground protection control unit is judged system's generation single phase ground fault, the ground protection control unit closes a floodgate the control that the phase-splitting circuit breaker breaks down mutually, reduces its earth current thereby the single phase ground fault electric wire occurs after closing a floodgate by Low ESR reactor, the first ground network; After earth fault was got rid of, the ground protection control unit made each control of phase-splitting circuit breaker keep mutually off-state, and whole circuit is proceeded monitoring.
Beneficial effect of the present invention is: the invention provides a kind of online line fault monitoring and protective device and guard method thereof; adopt effective connection of phase-splitting circuit breaker, Low ESR reactor, current transformer; can find out fast the fault point; when guaranteeing maintenance personal's personal safety; greatly improve fault removal efficiency, guaranteed resident's normal electricity consumption.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of online line fault monitoring and protective device, comprises phase-splitting circuit breaker 4, and described phase-splitting circuit breaker 4 links to each other with isolating switch 3, and isolating switch 3 links to each other with substation bus bar 2, and described substation bus bar 2 links to each other with PT cabinet 9; Described phase-splitting circuit breaker 4 links to each other with Low ESR reactor 5, ground protection control unit 1 respectively, and described Low ESR reactor 5 links to each other with current transformer 6, and current transformer 6 links to each other with the first ground network 7; Described ground protection control unit 1 links to each other with Low ESR reactor 5, current transformer 6, PT cabinet 9 respectively; Described substation bus bar 2 links to each other with the second ground network 8.Described ground protection control unit 1 adopts the single-chip microcomputer of many CPU.
The described a kind of online line fault monitoring of the present embodiment with the guard method of protective device is: at first ground protection control unit 1 gathers the voltage of substation bus bar 2 by PT cabinet 9, and ground protection control unit 1 gathers the electric current of current transformer 6 simultaneously; Then gather the three-phase of substation bus bar 2 according to ground protection control unit 1, line and residual voltage value, by the computing system three-phase, the amplitude of line and residual voltage and angle each other change judges whether system single phase ground fault occurs; When ground protection control unit 1 is judged system's generation single phase ground fault, ground protection control unit 1 closes a floodgate the control that phase-splitting circuit breaker 4 breaks down mutually, reduces its earth current thereby the single phase ground fault electric wire occurs after closing a floodgate by Low ESR reactor 5, the first ground network 7; After earth fault was got rid of, ground protection control unit 1 made 4 each control of phase-splitting circuit breaker keep mutually off-state, and whole circuit is proceeded monitoring.
A kind of online line fault monitoring and protective device and the guard method thereof of the present embodiment manufacturing; adopt effective connection of phase-splitting circuit breaker, Low ESR reactor, current transformer; can find out fast the fault point; when guaranteeing maintenance personal's personal safety; greatly improve fault removal efficiency, guaranteed resident's normal electricity consumption.
Claims (3)
1. an online line fault is monitored and protective device, it is characterized in that: comprise phase-splitting circuit breaker (4), described phase-splitting circuit breaker (4) links to each other with isolating switch (3), and isolating switch (3) links to each other with substation bus bar (2), and described substation bus bar (2) links to each other with PT cabinet (9); Described phase-splitting circuit breaker (4) links to each other with Low ESR reactor (5), ground protection control unit (1) respectively, and described Low ESR reactor (5) links to each other with current transformer (6), and current transformer (6) links to each other with the first ground network (7); Described ground protection control unit (1) links to each other with Low ESR reactor (5), current transformer (6), PT cabinet (9) respectively; Described substation bus bar (2) links to each other with the second ground network (8).
2. a kind of online line fault monitoring according to claim 1 and protective device is characterized in that: the single-chip microcomputer of the many CPU of described ground protection control unit (1) employing.
3. the guard method of a kind of online line fault monitoring according to claim 1 and protective device, it is characterized in that comprising the steps: that at first ground protection control unit (1) passes through the voltage that PT cabinet (9) gathers substation bus bar (2), and ground protection control unit (1) gathers the electric current of current transformer (6) simultaneously; Then gather the three-phase of substation bus bar (2) according to ground protection control unit (1), line and residual voltage value, by the computing system three-phase, the amplitude of line and residual voltage and angle each other change judges whether system single phase ground fault occurs; When ground protection control unit (1) is judged system's generation single phase ground fault, ground protection control unit (1) closes a floodgate the control that phase-splitting circuit breaker (4) breaks down mutually, the single phase ground fault electric wire occurs after closing a floodgate by Low ESR reactor (5), the first ground network (7) thus reduce its earth current; After earth fault was got rid of, ground protection control unit (1) made each control of phase-splitting circuit breaker (4) keep mutually off-state, and whole circuit is proceeded monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105584749A CN103001194A (en) | 2012-12-20 | 2012-12-20 | On-line line fault monitoring and protection device and protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105584749A CN103001194A (en) | 2012-12-20 | 2012-12-20 | On-line line fault monitoring and protection device and protection method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103001194A true CN103001194A (en) | 2013-03-27 |
Family
ID=47929467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105584749A Pending CN103001194A (en) | 2012-12-20 | 2012-12-20 | On-line line fault monitoring and protection device and protection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103001194A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105976999A (en) * | 2016-02-21 | 2016-09-28 | 珠海蓝瑞盟电气有限公司 | Electric reactor protection device and method for detecting turn-to-turn short circuit by utilizing H bridge |
| CN106483349A (en) * | 2016-11-23 | 2017-03-08 | 国网重庆市电力公司江津供电分公司 | A kind of transformer secondary side earthing detection protection system |
| CN109861188A (en) * | 2019-03-29 | 2019-06-07 | 国网山东省电力公司枣庄供电公司 | Earthing protecting method and system based on centralized new-energy grid-connected mode |
| US10761129B2 (en) | 2018-04-03 | 2020-09-01 | Shimi Nakash | Electrical power supply panel with increased safety through monitoring and control |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2424559Y (en) * | 2000-03-18 | 2001-03-21 | 重庆大学 | Device for fast regulating arc-extinguishing coil |
| CN101227089A (en) * | 2008-01-21 | 2008-07-23 | 孙嘉宁 | Discriminating and protecting method and apparatus for eliminating single phase ground fault by neutral point non-useful earthing electric network |
| CN201887444U (en) * | 2010-06-09 | 2011-06-29 | 范健夫 | Electric grounding comprehensive protector for TXHPT |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN203014360U (en) * | 2012-12-20 | 2013-06-19 | 诸暨市供电局 | On-line circuit fault monitoring and protecting device |
-
2012
- 2012-12-20 CN CN2012105584749A patent/CN103001194A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2424559Y (en) * | 2000-03-18 | 2001-03-21 | 重庆大学 | Device for fast regulating arc-extinguishing coil |
| CN101227089A (en) * | 2008-01-21 | 2008-07-23 | 孙嘉宁 | Discriminating and protecting method and apparatus for eliminating single phase ground fault by neutral point non-useful earthing electric network |
| CN101340086A (en) * | 2008-01-21 | 2009-01-07 | 孙嘉宁 | Single-phase grounding fault determining, protecting method and system of neutral-point uneffective earthed electric grid |
| CN201887444U (en) * | 2010-06-09 | 2011-06-29 | 范健夫 | Electric grounding comprehensive protector for TXHPT |
| CN102623985A (en) * | 2012-01-17 | 2012-08-01 | 合肥凯高电气设备有限公司 | Novel comprehensive grounding protection and route selection device for medium-voltage power distribution system |
| CN203014360U (en) * | 2012-12-20 | 2013-06-19 | 诸暨市供电局 | On-line circuit fault monitoring and protecting device |
Non-Patent Citations (1)
| Title |
|---|
| 喻建冬等: "微机消弧和选线装置在电力***中应用的探讨", 《科学之友》, 31 October 2011 (2011-10-31), pages 63 - 64 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105976999A (en) * | 2016-02-21 | 2016-09-28 | 珠海蓝瑞盟电气有限公司 | Electric reactor protection device and method for detecting turn-to-turn short circuit by utilizing H bridge |
| CN106483349A (en) * | 2016-11-23 | 2017-03-08 | 国网重庆市电力公司江津供电分公司 | A kind of transformer secondary side earthing detection protection system |
| CN106483349B (en) * | 2016-11-23 | 2019-01-22 | 国网重庆市电力公司江津供电分公司 | A kind of mutual inductor secondary side earthing detection protection system |
| US10761129B2 (en) | 2018-04-03 | 2020-09-01 | Shimi Nakash | Electrical power supply panel with increased safety through monitoring and control |
| CN109861188A (en) * | 2019-03-29 | 2019-06-07 | 国网山东省电力公司枣庄供电公司 | Earthing protecting method and system based on centralized new-energy grid-connected mode |
| CN109861188B (en) * | 2019-03-29 | 2021-06-04 | 国网山东省电力公司枣庄供电公司 | Grounding protection method and system based on centralized new energy grid-connected mode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103023000B (en) | Grid current limiting device and grid current limiting device and grid current limiting system | |
| CN106655120A (en) | Intelligent ground protection method and system for neutral point of power distribution network | |
| CN202535052U (en) | Neutral point grounding system via combination of reactance and resistor | |
| CN103001194A (en) | On-line line fault monitoring and protection device and protection method thereof | |
| CN202474853U (en) | Combined neutral point overvoltage protection device | |
| CN104377683A (en) | Device and method for single-phase intermittent arc grounding overvoltage protection | |
| CN201417945Y (en) | Integrated device for arc extinction, harmonic elimination and wire selection for electricity grid | |
| CN201008096Y (en) | Arc extinguishing compensation mechanism for neutral point non-effective earthing power network | |
| CN204649899U (en) | Small current grounding failure wire selection system in a kind of dispatching of power netwoks | |
| CN203014360U (en) | On-line circuit fault monitoring and protecting device | |
| CN202817567U (en) | Intelligent box-type wind power substation | |
| CN209184242U (en) | It is a kind of to dispatch controllable power network neutral point earthing or grounding means | |
| CN103580005B (en) | A kind of arc light protection method | |
| CN105375436A (en) | Automatic cutoff protection apparatus and method for overtime operation of neutral-point resistor cabinet | |
| CN201887444U (en) | Electric grounding comprehensive protector for TXHPT | |
| CN202535046U (en) | Microcomputer monitoring and protection device for mine-used high-voltage switch | |
| CN201789284U (en) | Interphase overvoltage protector of indirect grounding system | |
| CN105529685A (en) | Temporary IT grounding system switching method for variable-frequency-load TT grounding system low-voltage system under condition of electric leakage failure | |
| CN211017777U (en) | Arc and harmonic elimination device | |
| CN204407881U (en) | A kind of safe extinguishing arc pressure limiting device | |
| CN208386124U (en) | A kind of neutral point drifting protective device | |
| CN203193273U (en) | Intelligent turn-adjustment arc-extinguishing voltage-limiting device | |
| CN203826939U (en) | Electricity utilization system applied to high-voltage plant of large and medium-sized thermal power plant | |
| CN203301223U (en) | Rapid power supply switching device | |
| CN207994618U (en) | A kind of low residual voltage busbar stable-pressure device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130327 |