CN103036217A - Protective method for closed-loop running of power distribution network - Google Patents
Protective method for closed-loop running of power distribution network Download PDFInfo
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- CN103036217A CN103036217A CN2012105185927A CN201210518592A CN103036217A CN 103036217 A CN103036217 A CN 103036217A CN 2012105185927 A CN2012105185927 A CN 2012105185927A CN 201210518592 A CN201210518592 A CN 201210518592A CN 103036217 A CN103036217 A CN 103036217A
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Abstract
The invention discloses a protective method for closed-loop running of a power distribution network. The protective method for the closed-loop running of the power distribution network comprises that firstly a point-to-point high-speed optical fiber communication channel is built up between adjacent protective devices. A breakdown is ascertained and separated through exchanging states and breakdown information between the adjacent protective devices. The protective method which is feasible, perfect and moderate in investment cost is provided to the closed-loop running of the power distribution network, and the difficult problem of protection of the closed-loop running of the power distribution network is solved.
Description
Technical field
The present invention relates to a kind of guard method of power distribution network operation with closed ring, exactly is a kind of by mutually quick swap status, fault message between the adjacent protective device, determines fast the advanced power distribution network operation with closed ring guard method of fault and isolated fault.
Background technology
Along with the development of national economy and improving constantly of people's material and cultural life, economic development and people's life are increasing to electricity needs, impel electric utility to develop rapidly, electrical network constantly enlarges, the user is more and more higher to the requirement of power supply quality and power supply reliability, even the instantaneous interruption of the living power supply of running fire can not be stood.
At present, China's power distribution network generally adopts the supply power mode of closed loop design, open loop operation.When falling load or maintenance, must close, Open Loop Operation.Like this, will inevitably cause the power failure that non-fault line is unnecessary, cause damage to the user.In order more effectively to reduce power failure range and interruption duration, improve power supply reliability, can adopt power distribution network operation with closed ring mode, take full advantage of existing electric power networks resource, improve power supply reliability, the cost of greatly reducing investment outlay.
Yet power distribution network operation with closed ring mode must cooperate complete guard method, and guard method must guarantee to isolate fast and accurately the circuit fault zone, otherwise can cause the outlet switch tripping operation of bilateral transformer station, and the advantage of power distribution network operation with closed ring is all gone.But only adopt existing traditional main website guard method, the on the spot feeder automation method of distribution automation system, can not satisfy the Millisecond requirement of real-time that the protection of power distribution network operation with closed ring requires far away.Although such as optical-fiber longitudinal difference protection, can satisfy the fault quick isolating problem of cable line, the shortcoming such as there is the complexity of adjusting in optical-fiber longitudinal difference protection, can't solves cable T joint, harsh measurement is synchronous.Being power distribution network operation with closed ring mode, guard method feasible, complete, that cost of investment is moderate is provided, is a great problem of power distribution network operation with closed ring mode.
Summary of the invention
The purpose of this invention is to provide a kind of guard method of power distribution network operation with closed ring; a kind of by mutually quick swap status, fault message between the adjacent protective device; determine fast the advanced power distribution network operation with closed ring guard method of fault and isolated fault, solve the protection difficult problem of power distribution network operation with closed ring mode.
Technical scheme of the present invention: a kind of guard method of power distribution network operation with closed ring comprises:
Between adjacent protective device, set up point-to-point high speed optical fiber communication channel;
By mutual swap status, fault message between adjacent protective device, determine and isolated fault.
Described protective device comprises line sectionalizing circuit breaker or circuit network interconnecting circuit and transformer station's wire-outgoing breaker.
Describedly determine and isolated fault, be fault current information failure judgement according to phase adjacent band direction in the district outer or distinguish in, make protective device be failure to actuate or trip, thereby locate fast and isolate power distribution network operation with closed ring line fault.
Described fault current information is determined in the following manner: with the most abominable situation of power distribution network closed circuit end fault, and computational scheme fault minimum current; For basic routing line switch, transformer station's outlet switch adjust band direction error protection threshold value and time-delay T1 identical; Simultaneously, be transformer station's outlet switch adjust outlet backup protection threshold value and time-delay T2, T2 is greater than T1 and circuit breaker sum operate time, and keeps certain nargin; Efficiently solve distribution network line protection and only rely on multistage adjust threshold value and multistage delay judgement line fault poor selectivity, under-sensitive problem.
Description of drawings
Fig. 1 is power distribution network closed loop tie lines and protection communication structure schematic diagram;
Fig. 2 is the guard method principle schematic of power distribution network operation with closed ring;
Fig. 3 is distribution cable net closed loop tie lines and protection communication structure schematic diagram;
Fig. 4 is closed loop tie lines and the interval error protection action of the basic routing line schematic diagram of embodiment 1;
Fig. 5 is non-fault of branch line protection action schematic diagram in the closed loop tie lines of embodiment 2 and the power distribution room interval;
Fig. 6 is closed loop tie lines and the interval inner branch line error protection action of the power distribution room schematic diagram of embodiment 3.
Embodiment
Purpose of the present invention realizes by following concrete know-why: a kind of guard method of power distribution network operation with closed ring specifically may further comprise the steps:
Such as Fig. 1; MB1, MB2, MB3, MB4, MB5, MB6, TB for power distribution network closed loop defencive function is provided, with the protection of direction phase fault, with line sectionalizing circuit breaker or the circuit network interconnecting circuit of direction single phase earthing protection, CB1, CB2 for power distribution network closed loop defencive function is provided, with transformer station's wire-outgoing breaker of direction outlet defencive function.Set up point-to-point high speed optical fiber communication channel between CB1, MB1, MB2, MB3, TB, MB4, MB5, MB6, the CB2, realize the real-time high-fidelity redundancy communication of Millisecond by point-to-point high speed optical fiber communication channel, each other quick swap status and fault message;
With the most abominable situation of power distribution network closed circuit end fault, computational scheme fault minimum current; Be adjust the same band direction error protection threshold value and delay time 1 of CB1, MB1, MB2, MB3, TB, MB4, MB5, MB6, CB2; Simultaneously, be adjust outlet backup protection threshold value and delay time 2 of CB1, CB2, time-delay 2 must be greater than time-delay 1 and circuit breaker sum operate time, and keeps certain nargin; Efficiently solve distribution network line protection and only rely on multistage adjust threshold value and multistage delay judgement line fault poor selectivity, under-sensitive problem.
As shown in Figure 2, when circuit breaks down at MB2, MB3, CB1, MB1, MB2 detect the positive direction fault current, and MB3, TB, MB4, MB5, MB6, CB2 detect the reverse direction failure electric current; By state and the fault message of the exchange of point-to-point high speed optical fiber communication, MB1 learns that adjacent CB1, MB2 detect the positive direction fault current equally, can according to the fault current information failure judgement of phase adjacent band direction outside the district, be failure to actuate; In like manner, MB2 learns that adjacent MB1 detects the positive direction fault current, but MB3 detects the reverse direction failure electric current, can according to the fault current information failure judgement of phase adjacent band direction in the district, move in tripping operation; With above-mentioned process, MB3 moves in tripping operation, and CB1, TB, MB4, MB5, MB6, CB2 are failure to actuate; Accordingly, locate fast and isolate power distribution network operation with closed ring line fault, guarantee the safety of power distribution network operation with closed ring;
Embodiment 1
Such as Fig. 3, distribution cable net typical case tie lines is begun by the same low-voltage bus bar outlet switch CB1 of transformer station, CB2, and the closed loop supply district relates to power distribution room 1-5.Each power distribution room configuration one cover protective device, be respectively protective device 1-5, connect by point-to-point fiber optic communication channel between every cover protective device and the outlet switch CB1 of transformer station, the CB2, realize the real-time high-fidelity redundancy communication of Millisecond, each other quick swap status and fault message; MB1, MB3, MB4, MB6, MB7, MB9, MB10, MB12, MB13, MB15 are respectively the trunk line switch of power distribution room, and MB2, MB5, MB8, MB11, MB14 are respectively a wiretap of power distribution room.
Suppose the most abominable situation with power distribution network closed circuit end fault, computational scheme fault minimum current is 1000A.Every cover protective device is trunk line switch, a wiretap, and simultaneously configuration band direction fault detect is adjusted: 1000A threshold value and 60ms time-delay; The outlet switch CB1 of transformer station, CB2, the fault detect of configuration band direction is adjusted: 1000A threshold value and 60ms time-delay, and outlet backup protection adjust 1000A threshold value and 300ms time-delay; Between every cover protective device and the outlet switch CB1 of transformer station, the CB2, the resident real-time high-fidelity redundancy communication time interval is 5ms, each other quick swap status and fault message.
Such as Fig. 4, when circuit breaks down at MB3, MB4, CB1, MB1, MB3 detect the positive direction fault current, and MB4, MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 detect the reverse direction failure electric current; MB2, MB5, MB8, MB11, MB14 do not detect fault current; By state and the fault message of the exchange of point-to-point high speed optical fiber communication, MB1 learns that adjacent CB1, MB3 detect the positive direction fault current equally, can according to the fault current information failure judgement of phase adjacent band direction outside trunk region, be failure to actuate; In like manner, MB3 learns that adjacent MB1 detects the positive direction fault current, but MB4 detects the reverse direction failure electric current, can according to the fault current information failure judgement of phase adjacent band direction in trunk region, move in tripping operation; With above-mentioned process, MB4 moves in tripping operation, and CB1, MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 are failure to actuate; Accordingly, locate fast and isolate the interval fault of power distribution network operation with closed ring basic routing line.
Embodiment 2
Such as embodiment 1, about power distribution network tie lines, communication system and the protection configuration of Fig. 3.
Such as Fig. 5, occur in when fault between MB4, the MB6 of power distribution room 2, CB1, MB1, MB3, MB4 detect the positive direction fault current, and MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 detect the reverse direction failure electric current; MB2, MB5, MB8, MB11, MB14 do not detect fault current; By state and the fault message of the exchange of point-to-point high speed optical fiber communication, MB3 learns that adjacent MB1, MB4 detect the positive direction fault current equally, can according to the fault current information failure judgement of phase adjacent band direction outside trunk region, be failure to actuate; In like manner, MB4 learns that adjacent MB3 detects the positive direction fault current, but MB6 detects the reverse direction failure electric current, can according to the fault current information failure judgement of phase adjacent band direction in the power distribution room district, move in tripping operation; With above-mentioned process, MB6 moves in tripping operation, and CB1, MB1, MB7, MB9, MB10, MB12, MB13, MB15, CB2 are failure to actuate; Accordingly, locate fast and isolate non-fault of branch line in the power distribution network operation with closed ring power distribution room interval.
Embodiment 3
Such as embodiment 1, about power distribution network tie lines, communication system and the protection configuration of Fig. 3.
Such as Fig. 6, occur in the MB5 branch line of power distribution room 2 when fault, CB1, MB1, MB3, MB4 detect the positive direction fault current, and MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 detect the reverse direction failure electric current; MB5 detects fault current, and MB2, MB8, MB11, MB14 do not detect fault current; By state and the fault message of the exchange of point-to-point high speed optical fiber communication, MB3 learns that adjacent MB1, MB4 detect the positive direction fault current equally, can according to the fault current information failure judgement of phase adjacent band direction outside trunk region, be failure to actuate; Although MB4 learns adjacent MB3 and detects the positive direction fault current, MB6 detects the reverse direction failure electric current, but MB5 also detects fault current, can be according to the fault current information of phase adjacent band direction and the fault current information of MB5, failure judgement is at power distribution room district inner branch line, the MB4 locking is failure to actuate, and MB5 moves in tripping operation; With above-mentioned process, the MB6 locking is failure to actuate, and CB1, MB1, MB7, MB9, MB10, MB12, MB13, MB15, CB2 are failure to actuate; Accordingly, locate fast and isolate the interval inner branch line fault of power distribution network operation with closed ring power distribution room.
Among Fig. 1 to Fig. 6
Be co-bit,
Be a minute position.
Claims (4)
1. the guard method of a power distribution network operation with closed ring is characterized in that comprising:
Between adjacent protective device, set up point-to-point high speed optical fiber communication channel;
By mutual swap status, fault message between adjacent protective device, determine and isolated fault.
2. the guard method of power distribution network operation with closed ring according to claim 1 is characterized in that: described protective device comprises line sectionalizing circuit breaker or circuit network interconnecting circuit and transformer station's wire-outgoing breaker.
3. the guard method of power distribution network operation with closed ring according to claim 1; it is characterized in that: described definite and isolated fault; be according to the fault current information failure judgement of phase adjacent band direction in the district outer or distinguish in; make protective device be failure to actuate or trip, thereby locate fast and isolate power distribution network operation with closed ring line fault.
4. the guard method of power distribution network operation with closed ring according to claim 3 is characterized in that: described fault current information is determined in the following manner: with the most abominable situation of power distribution network closed circuit end fault, and computational scheme fault minimum current; For basic routing line switch, transformer station's outlet switch adjust band direction error protection threshold value and time-delay T1 identical; Simultaneously, be transformer station's outlet switch adjust outlet backup protection threshold value and time-delay T2, T2 is greater than T1 and circuit breaker sum operate time, and keeps certain nargin.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104617565A (en) * | 2014-12-15 | 2015-05-13 | 国网冀北电力有限公司秦皇岛供电公司 | Device and method for rapid identification of line distribution network fault location |
| CN106849034A (en) * | 2017-03-14 | 2017-06-13 | 国网江苏省电力公司苏州供电公司 | Overcurrent protection method and device based on power distribution network operation with closed ring mode |
| CN108011360A (en) * | 2017-12-30 | 2018-05-08 | 长园深瑞继保自动化有限公司 | Double loop round and round quickly unlinks method |
| CN114465236A (en) * | 2022-04-11 | 2022-05-10 | 赫兹曼电力（广东）有限公司 | Self-healing method for power distribution network to cope with ground fault and power distribution network |
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| US20090290275A1 (en) * | 2005-10-28 | 2009-11-26 | S & C Electric Co. | Fault Protection System and Method for an Electrical Power Distribution System |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617565A (en) * | 2014-12-15 | 2015-05-13 | 国网冀北电力有限公司秦皇岛供电公司 | Device and method for rapid identification of line distribution network fault location |
| CN104617565B (en) * | 2014-12-15 | 2018-03-13 | 国网冀北电力有限公司秦皇岛供电公司 | A kind of device and method of quick identification distribution line abort situation |
| CN106849034A (en) * | 2017-03-14 | 2017-06-13 | 国网江苏省电力公司苏州供电公司 | Overcurrent protection method and device based on power distribution network operation with closed ring mode |
| CN108011360A (en) * | 2017-12-30 | 2018-05-08 | 长园深瑞继保自动化有限公司 | Double loop round and round quickly unlinks method |
| CN108011360B (en) * | 2017-12-30 | 2019-04-16 | 长园深瑞继保自动化有限公司 | Double loop round and round quickly unlinks method |
| CN114465236A (en) * | 2022-04-11 | 2022-05-10 | 赫兹曼电力（广东）有限公司 | Self-healing method for power distribution network to cope with ground fault and power distribution network |
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| CN103036217B (en) | 2016-03-02 |
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Inventor after: Huo Jinqiang Inventor after: Li Jiatian Inventor before: Huo Jinqiang Inventor before: Li Jiatian |
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Effective date of registration: 20171124 Address after: 510245 Honoka South Street, Guangzhou Avenue, Guangzhou, Guangdong Province, No. 1 Co-patentee after: Guangzhou Power Supply Bureau Patentee after: Nanfang Electric Power Group Sci. & Tech. Dev. Co., Ltd., Guangzhou Address before: 510245 Honoka South Street, Guangzhou Avenue, Guangzhou, Guangdong Province, No. 1 Patentee before: Nanfang Electric Power Group Sci. & Tech. Dev. Co., Ltd., Guangzhou |
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Effective date of registration: 20190614 Address after: 510245 No. 1 Huanan Street, Zhongsui, Jiangnan Avenue, Haizhu District, Guangzhou City, Guangdong Province Patentee after: Nanfang Electric Power Group Sci. & Tech. Dev. Co., Ltd., Guangzhou Address before: 510245 No. 1 Huanan Street, Zhongsui, Jiangnan Avenue, Guangzhou City, Guangdong Province Co-patentee before: Guangzhou Power Supply Bureau Patentee before: Nanfang Electric Power Group Sci. & Tech. Dev. Co., Ltd., Guangzhou |