CN103490406A - Arc extinction device for solving problem of interphase short circuit according to full resistance method - Google Patents
Arc extinction device for solving problem of interphase short circuit according to full resistance method Download PDFInfo
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- CN103490406A CN103490406A CN201310460969.2A CN201310460969A CN103490406A CN 103490406 A CN103490406 A CN 103490406A CN 201310460969 A CN201310460969 A CN 201310460969A CN 103490406 A CN103490406 A CN 103490406A
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Abstract
The invention discloses an arc extinction device for solving the problem of an interphase short circuit according to the full resistance method. The arc extinction device comprises contact switches K1, K2, and K3, a grounding bar PE1, current transformers CT1, CT2 and CT3, metal resistors R1, R2 and R3, and contact switches K4, K5 and K6. One end of the contact switch K1, one end of the contact switch K2 and one end of the contact switch K3 are connected with the phase A, the phase B and the phase C of a 6-35kV bus respectively, and the other end of the contact switch K1, the other end of the contact switch K2 and the other end of the contact switch K3 form nodes N1, N2 and N3 respectively. The contact switches K4, K5 and K6 are connected between the nodes N1, N2 and N3 and the grounding bar PE1 in series respectively. The metal resistors R1, R2 and R3 are connected to the contact switches K4, K5 and K6 respectively in parallel. The current transformers CT1, CT2 and CT3 are arranged between the contact switches K1, K2, and K3 and the corresponding nodes N1, N2 and N3 respectively in a penetrating mode. The arc extinction device for solving the problem of the interphase short circuit according to the full resistance method has the advantages that the large interphase short circuit current caused by arc light overvoltage peak value switching on and wrong judgment can be effectively restrained.
Description
Technical field
The present invention relates to a kind of arc-extinction device, specifically a kind of arc-extinction device that adopts full resistance method to solve phase fault.
Background technology
Single phase ground fault earth current transfer device starts Earth Phase and obtains vacuum contactor when single-phase earthing occurs, and to the vacuum contactor place, makes fault point obtain minimum that electric current reduces the current transfer of fault point, reaches and extinguishes arc light, effectively prevents that fault point from blowing out.During artificial releasing fault, need artificial initiatively involution fault phase obtain vacuum contactor, but existing technology and method, software fault judges mutually can not accomplish that 100% is correct, the high-tension fuse in arc extinction cabinet, just for preventing from sentencing wrong establishing mutually.Once will cause phase fault or switch to close at the arc overvoltage peak period all can to cause high-tension fuse normally to cut-off yet sentence mutually mistake, system will lose the extinguishing arc protection, arc grounding likely causes the accident.If high-tension fuse can not cut-off, will cause the serious consequence of two aspects: or the arc extinction cabinet blast.Bus service entrance switch tripping operation, cause bus to have a power failure, and as chemical industry etc. requires extra high enterprise to power supply reliability, endangers large all the better.When the involution vacuum contactor, can produce switching overvoltage, affect the normal operation of system, the insulation that damages system and the normal equipment moved, increased the risk that system causes the accident because of overvoltage.And the electric charge that the system direct-to-ground capacitance stores can only be released by PT, thereby may cause PT resonance and PT, shove and may cause PT to burn while causing the PT fuse failure serious.
Summary of the invention
The technical problem to be solved in the present invention is for overcoming weak point of the prior art, provide a kind of simple in structure, implement to adopt easily full resistance method to solve the arc-extinction device of phase fault, its provide mistake sentence mutually or Closing Switch in the solution of arc light fuse failure during the peak period.
The present invention is achieved in that a kind of arc-extinction device that adopts full resistance method to solve phase fault, and this arc-extinction device comprises contact switch K1～K3, earthing bar PE1, Current Transmit 1～CT3, metallic resistance R1～R3, contact switch K4～K6; The end of three contact switch K1～K3 connects respectively three-phase A, B, the C of 6-35kV bus, and the other end of three contact switch K1～K3 forms respectively node N1～N3; Contact switch K4～the K6 that connects respectively between node N1～N3 and earthing bar PE1, metallic resistance R1～R3 is connected in parallel on respectively on contact switch K4～K6; Penetrate Current Transmit 1～CT3 between contact switch K1～K3 and corresponding node N1～N3.
Further improvement as such scheme, when the external system generation arc grounding that is connected to this arc-extinction device or metal ground connection, control system failure judgement phase A or B or the C of this external system, and the bus upper end contact switch K1～K3 of the phase arc-extinction device of answering according to the fault phase control system control closed pair of judgement, effectively suppressing the arc overvoltage peak value by metallic resistance R1～R3 ground connection closes a floodgate and sentences mistake mutually and cause the large electric current of phase fault, the electric current of crossing metallic resistance R1～R3 by sample streams by control system is closed after sentencing the correctness of phase and whether having suppressed crest voltage is connected in parallel on the contact switch K4～K6 on metallic resistance R1～R3.
Preferably, when this external system fault recovery is artificial or during automatic resetting, first open after the contact switch K4～K6 be connected in parallel on metallic resistance R1～R3 the separately contact switch K1～K3 of fault phase.
Employing of the present invention resistance method entirely solves the arc-extinction device of phase fault, the technical scheme adopted is: the every of 6-35kV bus, by 1 contact switch, connect mutually, contact switch upper end connection bus, connect a high-power metallic resistance in the lower end of switch and receive the ground connection busbar, and on high-power metallic resistance a contact switch in parallel, the ABC circuitry phase is identical.Software failure judgement phase A or B or C when system generation arc grounding or metal ground connection, end switch on the bus of the phase arc extinction cabinet of answering according to the fault phase control system control closed pair of judgement, effectively suppress the arc overvoltage peak value by metallic resistance ground connection and close a floodgate and sentence mistake mutually and cause the large electric current of phase fault, be unlikely to cause fuse failure to make the arc extinction cabinet operation that logs off cause larger harm.The electric current of crossing metallic resistance by sample streams by control system sentence the correctness of phase and whether suppressed crest voltage after closure be connected in parallel on ohmically switch, the inhibiting metallic resistance of bypass makes the impedance of arc extinction cabinet minimum, effectively shift on-the-spot fault current to arc extinction cabinet, reach the effect of eliminating fault point arc light over-voltage suppression.When system failure recovery is artificial or during automatic resetting; first open and be connected in parallel on after the ohmically switch of high-power metallic the separately switch of fault phase; seal in powerful metallic resistance during due to minute breakdown switch and effectively suppressed the sub-switching operation overvoltage; thereby the saturation that suppresses PT suppresses the possibility of PT resonance, effectively protects the normal operation of PT.
The accompanying drawing explanation
The employing resistance method entirely that Fig. 1 provides for better embodiment of the present invention solves the structural representation of the arc-extinction device of phase fault.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The arc-extinction device that the employing resistance method entirely that referring to Fig. 1 better embodiment of the present invention provides solves phase fault comprises contact switch K1～K3, earthing bar PE1, Current Transmit 1～CT3, metallic resistance R1～R3, contact switch K4～K6.
The end of three contact switch K1～K3 connects respectively three-phase A, B, the C of 6-35kV bus, and the other end of three contact switch K1～K3 forms respectively node N1～N3.Contact switch K4～the K6 that connects respectively between node N1～N3 and earthing bar PE1, metallic resistance R1～R3 is connected in parallel on respectively on contact switch K4～K6.Penetrate Current Transmit 1～CT3 between contact switch K1～K3 and corresponding node N1～N3.
As shown in Figure 1, be connected to Node B 1, B2, B3 at 6-35kV bus place by K1, K2, connection bus lower end, K3 upper end.Access K switch 4 in parallel and high-power metallic resistance R 1, K switch 5 and high-power metallic resistance R 2, K switch 6 and high-power metallic resistance R 3 between Node B 1, B2, B3 and earthing bar PE1, and penetrating between Current Transmit 1, resistance K2 lower end and Node B 2 and penetrating between Current Transmit 2, resistance K3 lower end and Node B 3 and penetrate Current Transmit 3 between resistance K1 lower end and Node B 1.
Software failure judgement phase A or B or C when system generation arc grounding or metal ground connection, bus-tie circuit breaker K1, K2, the K3 of the phase arc extinction cabinet of answering according to the fault phase control system control closed pair of judgement, effectively suppress the arc overvoltage peak value by metallic resistance R1, R2, R3 ground connection and close a floodgate and sentence mistake mutually and cause the large electric current of phase fault, be unlikely to cause fuse failure to make the arc extinction cabinet operation that logs off cause larger harm.The electric current of crossing metallic resistance R1, R2, R3 by CT1, CT2, CT3 sample streams by control system sentence the correctness of phase and whether suppressed crest voltage after closure be connected in parallel on ohmically K switch 4, K5, K6, the inhibiting metallic resistance of bypass makes the impedance of arc extinction cabinet minimum, effectively shift on-the-spot fault current to arc extinction cabinet, reach the effect of eliminating fault point arc light over-voltage suppression.When system failure recovery is artificial or during automatic resetting; first open and be connected in parallel on after the ohmically K switch 4 of high-power metallic, K5, K6 separately K switch 1, K2, the K3 of fault phase; sealed in powerful metallic resistance R1 during due to minute breakdown switch, R2, R3 effectively suppress the sub-switching operation overvoltage; thereby the saturation that suppresses PT suppresses the possibility of PT resonance, effectively protects the normal operation of PT.
Arc-extinction device of the present invention adopts full resistance method to solve phase fault,, comprise contact switch K1, K2, the K3 be connected across between bus and ground and seal in contact switch K4 and high-power metallic resistance R 1, contact switch K5 and high-power metallic resistance R 2, contact switch K6 and the high-power metallic resistance R 3 be connected in parallel between end node N1, N2, N3 and earthing bar under contact switch K1, K2, K3 switch.When system generation earth fault, by control system, control contact switch K1, K2, K3 fault phase to the inductive switch closure.And guarantee that before closed phase switch contact switch K4, K5, K6 divide out, suppress system short-circuit or earth current by metallic resistance R1, R2, R3.Guaranteeing the system normal operation when control system is that closing contact K switch 4, K5, K6 metallic resistance R1, R2, R3 make current in the fault point transfer to arc extinction cabinet fully.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. an arc-extinction device that adopts full resistance method to solve phase fault, this arc-extinction device comprises contact switch K1～K3, earthing bar PE1; It is characterized in that: this arc-extinction device also comprises Current Transmit 1～CT3, metallic resistance R1～R3, contact switch K4～K6; The end of three contact switch K1～K3 connects respectively three-phase A, B, the C of 6-35kV bus, and the other end of three contact switch K1～K3 forms respectively node N1～N3; Contact switch K4～the K6 that connects respectively between node N1～N3 and earthing bar PE1, metallic resistance R1～R3 is connected in parallel on respectively on contact switch K4～K6; Penetrate Current Transmit 1～CT3 between contact switch K1～K3 and corresponding node N1～N3.
2. employing as claimed in claim 1 resistance method entirely solves the arc-extinction device of phase fault, it is characterized in that: when the external system generation arc grounding that is connected to this arc-extinction device or metal ground connection, control system failure judgement phase A or B or the C of this external system, and the bus upper end contact switch K1～K3 of the phase arc-extinction device of answering according to the fault phase control system control closed pair of judgement, effectively suppressing the arc overvoltage peak value by metallic resistance R1～R3 ground connection closes a floodgate and sentences mistake mutually and cause the large electric current of phase fault, the electric current of crossing metallic resistance R1～R3 by sample streams by control system is closed after sentencing the correctness of phase and whether having suppressed crest voltage is connected in parallel on the contact switch K4～K6 on metallic resistance R1～R3.
3. employing as claimed in claim 2 resistance method entirely solves the arc-extinction device of phase fault, it is characterized in that: when this external system fault recovery is artificial or during automatic resetting, first open after the contact switch K4～K6 be connected in parallel on metallic resistance R1～R3 the separately contact switch K1～K3 of fault phase.
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| CN201310460969.2A CN103490406A (en) | 2013-09-29 | 2013-09-29 | Arc extinction device for solving problem of interphase short circuit according to full resistance method |
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| CN201310460969.2A CN103490406A (en) | 2013-09-29 | 2013-09-29 | Arc extinction device for solving problem of interphase short circuit according to full resistance method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108702177A (en) * | 2016-02-17 | 2018-10-23 | 日本电气株式会社 | Earthed circuit and earthing method |
| CN109155520A (en) * | 2016-05-25 | 2019-01-04 | 日本电气株式会社 | Earthed circuit, electric device, ground connection control method and ground connection control program |
| CN110998775A (en) * | 2017-08-07 | 2020-04-10 | 日本电气株式会社 | Grounding circuit, electrical device, grounding control method, and grounding control program |
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| CN201282330Y (en) * | 2008-08-08 | 2009-07-29 | 陆华俊 | Small current arc-extinguishing grounding device |
| US8487635B1 (en) * | 2010-12-08 | 2013-07-16 | Dev Paul | System and method for determining system charging current |
| CN203522176U (en) * | 2013-09-29 | 2014-04-02 | 安徽一天电气技术有限公司 | Arc extinction device for solving problem of interphase short circuit according to full resistance method |
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2013
- 2013-09-29 CN CN201310460969.2A patent/CN103490406A/en active Pending
Patent Citations (5)
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| CN2471004Y (en) * | 2001-01-24 | 2002-01-09 | 张亚梅 | Crowbar device of neutral point directly grounding system |
| CN101009429A (en) * | 2006-01-16 | 2007-08-01 | 林苏 | Harmony and arc elimination method of the neutral point non-valid grounding power grid and its integrated protection device |
| CN201282330Y (en) * | 2008-08-08 | 2009-07-29 | 陆华俊 | Small current arc-extinguishing grounding device |
| US8487635B1 (en) * | 2010-12-08 | 2013-07-16 | Dev Paul | System and method for determining system charging current |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108702177A (en) * | 2016-02-17 | 2018-10-23 | 日本电气株式会社 | Earthed circuit and earthing method |
| US10404382B2 (en) | 2016-02-17 | 2019-09-03 | Nec Corporation | Grounding circuit and grounding method |
| CN108702177B (en) * | 2016-02-17 | 2020-03-06 | 日本电气株式会社 | Grounding circuit and grounding method |
| CN109155520A (en) * | 2016-05-25 | 2019-01-04 | 日本电气株式会社 | Earthed circuit, electric device, ground connection control method and ground connection control program |
| US10666044B2 (en) | 2016-05-25 | 2020-05-26 | Nec Corporation | Grounding circuit, electrical device, grounding control method, and grounding control program |
| CN110998775A (en) * | 2017-08-07 | 2020-04-10 | 日本电气株式会社 | Grounding circuit, electrical device, grounding control method, and grounding control program |
| CN110998775B (en) * | 2017-08-07 | 2022-04-05 | 日本电气株式会社 | Grounding circuit, electrical device, grounding control method, and grounding control program |
| US11488792B2 (en) | 2017-08-07 | 2022-11-01 | Nec Corporation | Grounding circuit, electrical apparatus, grounding control method, and grounding control program |
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Address after: 230001 No. 99 Yonghe Road, hi tech Zone, Anhui, Hefei Applicant after: Anhui electric technology Limited by Share Ltd Address before: 230001 No. 99 Yonghe Road, hi tech Zone, Anhui, Hefei Applicant before: Anhui Yitian Electrical Technology Co., Ltd. |
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