CN103036217B - A kind of guard method of power distribution network operation with closed ring - Google Patents
A kind of guard method of power distribution network operation with closed ring Download PDFInfo
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- CN103036217B CN103036217B CN201210518592.7A CN201210518592A CN103036217B CN 103036217 B CN103036217 B CN 103036217B CN 201210518592 A CN201210518592 A CN 201210518592A CN 103036217 B CN103036217 B CN 103036217B
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Abstract
The present invention discloses a kind of guard method of power distribution network operation with closed ring, comprises and first between adjacent protective device, sets up point-to-point high speed optical fiber communication channel; By mutual between adjacent protective device swap status, fault message, determine and isolated fault.For power distribution network operation with closed ring mode, provide feasible, complete, that cost of investment is moderate guard method, solve a protection difficult problem for power distribution network operation with closed ring mode.
Description
Technical field
The present invention relates to a kind of guard method of power distribution network operation with closed ring, be exactly a kind of by mutual between adjacent protective device swap status, fault message fast, determine the advanced power distribution network operation with closed ring guard method of fault and isolated fault fast.
Background technology
Along with the development of national economy and improving constantly of people's material and cultural life, economic development and people live increasing to electricity needs, electric utility is impelled to develop rapidly, electrical network constantly expands, the requirement of user to power supply quality and power supply reliability is more and more higher, and even the momentary interruption of the raw 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 carry out closing, Open Loop Operation.Like this, the power failure that non-fault line is unnecessary will inevitably be caused, cause damage to user.In order to more effectively reduce power failure range and interruption duration, improving power supply reliability, power distribution network operation with closed ring mode can be adopted, make full use of existing electric power networks resource, improve power supply reliability, cost of greatly reducing investment outlay.
But power distribution network operation with closed ring mode must coordinate complete guard method, guard method must guarantee to isolate circuit fault zone fast and accurately, 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 the main website guard method only adopting existing distribution automation system traditional, feeder automation method on the spot, can not meet 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, the quick isolating problem of fault of cable line can be met, the shortcomings such as optical-fiber longitudinal difference protection exists complexity of adjusting, cannot solve cable T joint, harsh measurement is synchronous.For power distribution network operation with closed ring mode, providing feasible, complete, that cost of investment is moderate guard method, is a great problem of power distribution network operation with closed ring mode.
Summary of the invention
The object of this invention is to provide a kind of guard method of power distribution network operation with closed ring; a kind of by mutual between adjacent protective device swap status, fault message fast; determine the advanced power distribution network operation with closed ring guard method of fault and isolated fault fast, solve a protection difficult problem for 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, comprising:
Point-to-point high speed optical fiber communication channel is set up between adjacent protective device;
By mutual between adjacent protective device swap status, fault message, determine and isolated fault.
Described protective device is line sectionalizing circuit breaker, circuit network interconnecting circuit or transformer station's wire-outgoing breaker.
Described determination isolated fault outside district or in district according to the fault current information failure judgement in adjacent belts direction, protective device are failure to actuate or trip, thus quick position and isolation power distribution network operation with closed ring line fault.
Described fault current information is determined in the following manner: with the most harsh conditions of power distribution network closed circuit end fault, computational scheme fault minimum current; The band direction error protection threshold value of adjusting identical for basic routing line switch, transformer station's outlet switch and time delay T1; Meanwhile, for adjust outlet backup protection threshold value and time delay T2, T2 of transformer station's outlet switch is greater than T1 and breaker actuation time sum, and certain nargin is retained; Efficiently solving distribution network line protection only relies on multistage to adjust threshold value and multistage delay judgement line fault poor selectivity, under-sensitive problem.
Accompanying drawing explanation
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 fault protection schematic diagram of basic routing line of embodiment 1;
Fig. 5 is non-fault of branch line protection act schematic diagram in the closed loop tie lines of embodiment 2 and power distribution room interval;
Fig. 6 is closed loop tie lines and the power distribution room interval inner branch line fault protection schematic diagram of embodiment 3.
Embodiment
Object of the present invention is realized by following concrete know-why: a kind of guard method of power distribution network operation with closed ring, specifically comprises the following steps:
As Fig. 1; MB1, MB2, MB3, MB4, MB5, MB6, TB are for providing power distribution network closed loop defencive function, the phase fault protection of band direction, the line sectionalizing circuit breaker being with direction single phase earthing protection or circuit network interconnecting circuit, and CB1, CB2 are for providing transformer station's wire-outgoing breaker of power distribution network closed loop defencive function, band direction outlet defencive function.Point-to-point high speed optical fiber communication channel is set up between CB1, MB1, MB2, MB3, TB, MB4, MB5, MB6, CB2, the real-time high-fidelity redundancy communication of Millisecond is realized, each other quick swap status and fault message by point-to-point high speed optical fiber communication channel;
With the most harsh conditions of power distribution network closed circuit end fault, computational scheme fault minimum current; For CB1, MB1, MB2, MB3, TB, MB4, MB5, MB6, CB2 adjust the same band direction error protection threshold value and time delay 1; Meanwhile, for CB1, CB2 adjust outlet backup protection threshold value and time delay 2, time delay 2 must be greater than time delay 1 and breaker actuation time sum, and retains certain nargin; Efficiently solving distribution network line protection only relies on multistage to 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 positive direction fault current, and MB3, TB, MB4, MB5, MB6, CB2 detect reverse direction failure electric current; The state exchanged by point-to-point high speed optical fiber communication and fault message, MB1 learns that adjacent CB1, MB2 detect positive direction fault current equally, according to the fault current information failure judgement in adjacent belts direction outside district, can be failure to actuate; In like manner, MB2 learns that adjacent MB1 detects positive direction fault current, but MB3 detects reverse direction failure electric current, can according to the fault current information failure judgement in adjacent belts direction in district, and action is in tripping operation; Same said process, MB3 action is in tripping operation, and CB1, TB, MB4, MB5, MB6, CB2 are failure to actuate; Accordingly, quick position and isolation power distribution network operation with closed ring line fault, guarantee the safety of power distribution network operation with closed ring;
embodiment 1
As Fig. 3, distribution cable net typical case tie lines, by transformer station same low-voltage bus bar outlet switch CB1, CB2, closed loop supply district relates to power distribution room 1-5.Each power distribution room configures a set of protective device, be respectively protective device 1-5, often overlap protective device and connected by point-to-point fiber optic communication channel between transformer station outlet switch CB1, CB2, realizing 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.
Assuming that with the most harsh conditions of power distribution network closed circuit end fault, computational scheme fault minimum current is 1000A.Often overlapping protective device is trunk line switch, a wiretap, and configure band direction fault detect is simultaneously adjusted: 1000A threshold value and 60ms time delay; Transformer station outlet switch CB1, CB2, the fault detect of configure band direction is adjusted: 1000A threshold value and 60ms time delay, and outlet backup protection is adjusted 1000A threshold value and 300ms time delay; Often overlap protective device and between transformer station outlet switch CB1, CB2, the resident real-time high-fidelity redundancy communication time interval is 5ms, each other swap status and fault message fast.
As Fig. 4, when circuit breaks down at MB3, MB4, CB1, MB1, MB3 detect positive direction fault current, and MB4, MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 detect reverse direction failure electric current; MB2, MB5, MB8, MB11, MB14 do not detect fault current; The state exchanged by point-to-point high speed optical fiber communication and fault message, MB1 learns that adjacent CB1, MB3 detect positive direction fault current equally, according to the fault current information failure judgement in adjacent belts direction outside trunk region, can be failure to actuate; In like manner, MB3 learns that adjacent MB1 detects positive direction fault current, but MB4 detects reverse direction failure electric current, can according to the fault current information failure judgement in adjacent belts direction in trunk region, and action is in tripping operation; Same said process, MB4 action is in tripping operation, and CB1, MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 are failure to actuate; Accordingly, quick position and the interval fault of isolation power distribution network operation with closed ring basic routing line.
embodiment 2
As embodiment 1, about the power distribution network tie lines of Fig. 3, communication system and relaying configuration.
As Fig. 5, when fault occurs between MB4, MB6 of power distribution room 2, CB1, MB1, MB3, MB4 detect positive direction fault current, and MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 detect reverse direction failure electric current; MB2, MB5, MB8, MB11, MB14 do not detect fault current; The state exchanged by point-to-point high speed optical fiber communication and fault message, MB3 learns that adjacent MB1, MB4 detect positive direction fault current equally, according to the fault current information failure judgement in adjacent belts direction outside trunk region, can be failure to actuate; In like manner, MB4 learns that adjacent MB3 detects positive direction fault current, but MB6 detects reverse direction failure electric current, can according to the fault current information failure judgement in adjacent belts direction in power distribution room district, and action is in tripping operation; Same said process, MB6 action is in tripping operation, and CB1, MB1, MB7, MB9, MB10, MB12, MB13, MB15, CB2 are failure to actuate; Accordingly, quick position and isolation power distribution network operation with closed ring power distribution room interval in non-fault of branch line.
embodiment 3
As embodiment 1, about the power distribution network tie lines of Fig. 3, communication system and relaying configuration.
As Fig. 6, when fault occurs in the MB5 branch line of power distribution room 2, CB1, MB1, MB3, MB4 detect positive direction fault current, and MB6, MB7, MB9, MB10, MB12, MB13, MB15, CB2 detect reverse direction failure electric current; MB5 detects fault current, and MB2, MB8, MB11, MB14 do not detect fault current; The state exchanged by point-to-point high speed optical fiber communication and fault message, MB3 learns that adjacent MB1, MB4 detect positive direction fault current equally, according to the fault current information failure judgement in adjacent belts direction outside trunk region, can be failure to actuate; Although MB4 learns that adjacent MB3 detects positive direction fault current, MB6 detects reverse direction failure electric current, but MB5 also detects fault current, can according to the fault current information of the fault current information in adjacent belts direction and MB5, failure judgement is at power distribution room district inner branch line, MB4 locking is failure to actuate, and MB5 action is in tripping operation; Same said process, MB6 locking is failure to actuate, and CB1, MB1, MB7, MB9, MB10, MB12, MB13, MB15, CB2 are failure to actuate; Accordingly, quick position and the interval inner branch line fault of isolation power distribution network operation with closed ring power distribution room.
In Fig. 1 to Fig. 6
for co-bit,
for a point position.
Claims (2)
1. a guard method for power distribution network operation with closed ring, is characterized in that comprising:
Point-to-point high speed optical fiber communication channel is set up between adjacent protective device; A point only communicates with adjacent two points;
By mutual between adjacent protective device swap status, fault message, determine and isolated fault;
Described determination isolated fault outside district or in district according to the fault current information failure judgement in adjacent belts direction, protective device are failure to actuate or trip, thus quick position and isolation power distribution network operation with closed ring line fault;
Described fault current information is determined in the following manner: with the most harsh conditions of power distribution network closed circuit end fault, computational scheme fault minimum current; The band direction error protection threshold value of adjusting identical for basic routing line switch, transformer station's outlet switch and time delay T1; Meanwhile, for adjust outlet backup protection threshold value and time delay T2, T2 of transformer station's outlet switch is greater than T1 and breaker actuation time sum, and certain nargin is retained.
2. the guard method of power distribution network operation with closed ring according to claim 1, is characterized in that: described protective device is line sectionalizing circuit breaker, circuit network interconnecting circuit or transformer station's wire-outgoing breaker.
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| 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 |
| 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 |
| CN114465236B (en) * | 2022-04-11 | 2022-07-08 | 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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| CN102005746A (en) * | 2010-11-30 | 2011-04-06 | 南京南瑞继保电气有限公司 | Method based on topology protection of distributing network |
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| BRPI0617832B1 (en) * | 2005-10-28 | 2018-10-09 | S & C Electric Co | fault protection system and method of providing coordinated fault protection for a distribution line by coupling a source to a load |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102005746A (en) * | 2010-11-30 | 2011-04-06 | 南京南瑞继保电气有限公司 | Method based on topology protection of distributing network |
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| 一种快速自愈的分布智能馈线自动化系统;刘健等;《电力系统自动化》;20100525;第34卷(第10期);第62－66页 * |
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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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