CN102709885A - Method for isolating power distribution network fault without constant time lag in over-current protection of transformer substation - Google Patents
Method for isolating power distribution network fault without constant time lag in over-current protection of transformer substation Download PDFInfo
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- CN102709885A CN102709885A CN2012101685134A CN201210168513A CN102709885A CN 102709885 A CN102709885 A CN 102709885A CN 2012101685134 A CN2012101685134 A CN 2012101685134A CN 201210168513 A CN201210168513 A CN 201210168513A CN 102709885 A CN102709885 A CN 102709885A
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Abstract
The invention provides a method for isolating power distribution network faults without constant time lag in over-current protection of a transformer substation. An unfixed time lag mode is adopted to operate a transformer substation outlet circuit breaker; a proper solving scheme is selected by judging the place where the fault happens, so that the protection action is more precise and reliable; especially when the fault happens nearby the transformer substation outlet circuit breaker, the transformer substation outlet circuit breaker can be tripped immediately, so that the rapidness of the transformer substation outlet circuit breaker is improved, the electric equipment is protected effectively, and the security of a power system is improved. Furthermore, the invention provides a corresponding operation time sequence to ensure the effective and reliable implementation of the method. The method is smart in design and good in use effect and is predicated to be used widely in the field of relay protection.
Description
Technical field
What the present invention proposed is the distribution network failure partition method that a kind of transformer station overcurrent protection does not have constant time lag.
Background technology
In distribution automation system, quick location, isolation and the reconstruct of fault are one of most important component.It is master's stage protected mode that China's tradition power distribution network relaying protection is generally adopted with electric current, voltage, according to preset setting value isolated fault point.
Along with power distribution network constantly develops, network is huge day by day and complicated, and traditional distribution protection has been difficult to guarantee selectivity and rapidity.10KV transformer station power supply distance generally has only 3-5km in the load compact district, is divided into the 3-5 section by section breaker.On short like this circuit, adopt stage protections such as traditional overcurrent, overvoltage, distance, the cooperation more and more difficult of adjusting.The result is any point fault on the circuit, and transformer station's outlet breaker all possibly non-selectivity trip, and causes road power failure completely, causes the power distribution network operational reliability to reduce.See accompanying drawing 1.
Recently, some system applies power distribution network network protection, adopt the method for Network Transmission, make protective device can access associated electrical tolerance and information beyond the mounting points, through logic determines, confirm fault section.
Such as Chinese invention patent application " method that distributed overcurrent protection of power distribution network and phase-to phase fault are isolated " (application number: 20111021552.1); It installs intelligent apparatus at the panel switches place; Whether the electric current that intelligent apparatus can be monitored panel switches overcurrent; All intelligent apparatus carry out communication through network; The stream information excessively that intelligent apparatus transmits through local Information Monitoring and other intelligent apparatus judges whether phase fault occurs on the contiguous distribution line in panel switches downstream, and breaks off panel switches in view of the above.
But network protection must cooperatively interact with transformer station's outlet breaker protection in time, otherwise transformer station's outlet breaker still can trip.The measure of taking at present is the operate time of protection that prolongs outlet breaker, reserves 200ms and delays time and carry out information exchange and Fault Isolation to network protection.This just means the outlet short circuit in transformer station, also must be through the isolated fault of time-delay ability.
Yet at present the distribution network system short circuit current level is higher, even even some transformer station's no delay tripping transformer of protection also can damage, have on transformer station's circuit, install current limiting reactor additional, to reduce short circuit current.Be the network protection that the selectivity that realizes distribution protection designs, sometimes make the isolation of transformer station's outlet fault lose rapidity, the safety that threatens power equipment, electric power system.
Summary of the invention
The technical problem that the present invention will solve is: overcome the above-mentioned deficiency of prior art, provide a kind of transformer station overcurrent protection not have the distribution network failure partition method of constant time lag.
In order to solve above technical problem; Transformer station provided by the invention overcurrent protection does not have the distribution network failure partition method of constant time lag; Composition comprises: the intelligent apparatus of transformer station's outlet breaker, panel switches, transformer station's outlet breaker, the intelligent apparatus of panel switches; All intelligent apparatus is characterized in that through network communication:
When intelligent apparatus judges that fault occurs on the distribution line between the panel switches; Then the intelligent apparatus of the arbitrary panel switches in the fault upper reaches sends block signal to the intelligent apparatus of this side transformer station outlet breaker constantly at T1, and the intelligent apparatus of said fault both sides panel switches sends trip signal to panel switches simultaneously; After the intelligent apparatus of this side transformer station outlet breaker (being adjusted into T4 its intrinsic operate time) receives said block signal; Protection is returned immediately; And the time-delay of T5 is set automatically, between this time delay in transformer station's outlet breaker intelligent apparatus do not send out trip signal to transformer station's outlet breaker; Finish when fault both sides panel switches trip, the intelligent apparatus of section breaker sends the order of closing a floodgate, and after section breaker closed a floodgate, the distribution line at the section breaker upper reaches was supplied power by offside transformer station;
Judge that when intelligent apparatus fault occurs between panel switches and this side transformer station outlet breaker, the intelligent apparatus of the contiguous panel switches of the intelligent apparatus of this side transformer station outlet breaker and fault down stream sends trip signal; When the contiguous panel switches tripping operation of this side transformer station outlet breaker and fault down stream finishes, the intelligent apparatus of section breaker sends the order of closing a floodgate, and after section breaker closed a floodgate, the distribution line at the section breaker upper reaches was supplied power by offside transformer station.
Among the present invention, T5 gets 200ms.
The further technical scheme of taking of the present invention is following: when transformer station's outlet breaker is experienced short circuit current; The intelligent apparatus of transformer station's outlet breaker gets into defence program immediately; If the intelligent apparatus of transformer station's outlet breaker is received the block signal that any panel switches intelligent apparatus is sent except that adjacent panel switches intelligent apparatus at T1 in the time, then defence program returns immediately; Otherwise transformer station's outlet breaker intelligent apparatus with intrinsic operate time T4 start transformer station's outlet breaker tripping operation, T1 is intrinsic operate time of panel switches intelligent apparatus, 40ms < T4 < 50ms.
Further; When intelligent apparatus judges that fault occurs on the distribution line between the panel switches; Then the intelligent apparatus of the contiguous panel switches in the fault upper reaches sends block signal to the intelligent apparatus of this side transformer station outlet breaker constantly in T1; Said T1 is intrinsic operate time of panel switches intelligent apparatus, and the intelligent apparatus of section breaker sends the order of closing a floodgate constantly in T1+T2, and T2 is that panel switches are carried out the time that tripping operation is experienced; Isolate and the nargin of the time that restores electricity is T5-T2-T3, T3 sends the time that trip signal to section breaker is accomplished tripping operation for the section breaker intelligent apparatus, and this time margin is used to remedy and disperses the operate time of circuit breaker and panel switches.
In the inventive method, when short trouble occurring, then transformer station's outlet breaker of fault side can be experienced short circuit current; The intelligent apparatus at this place gets into defence program immediately so; If fault occurs on the distribution line between the panel switches, the intelligent apparatus of the arbitrary panel switches in the fault upper reaches sends block signal in the T1 time to this transformer station's outlet breaker intelligent apparatus so, to stop transformer station's outlet breaker tripping operation; And be provided with the time-delay of 200ms; In the time-delay of this 200ms, be enough to isolated fault, and realize reconstruct (distribution line at the section breaker upper reaches is by the power supply of offside transformer station); If judge that short trouble occurs near transformer station's outlet breaker; This transformer station's outlet breaker of so this fault tripping immediately; And time-delay need be set; Farthest protected electric equipments such as substation transformer, reduced it owing to transformer station exports the possibility that closely short circuit is damaged.
The present invention adopts unfixed time-delay mode that transformer station's outlet breaker is operated; Through the suitable solution of ground point selection that failure judgement takes place, make the protection action more precisely reliable, especially when fault occurs near transformer station's outlet breaker; The transformer station of tripping immediately outlet breaker; Improve the rapidity of transformer station's outlet fault, effectively protected power equipment, improved the fail safe of electric power system.And the invention provides the corresponding time sequential routine, guarantee the effectively reliable enforcement of the inventive method.The present invention is skillfully constructed, and result of use is good, and expectation will will be found broad application in the relaying protection field.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is the composition sketch map of network protective relaying device.
Fig. 2 is the operation sequential chart of the inventive method.
Embodiment
Specify the present invention according to accompanying drawing below, it is more obvious that the object of the invention and effect will become.
Embodiment of the invention transformer station overcurrent protection does not have the distribution network failure partition method of constant time lag; Its hardware components composition as shown in Figure 1 comprises: the outlet breaker DLA of transformer station, DLB; Panel switches DL1, DL2, DL3, DL4, the intelligent apparatus A of transformer station's outlet breaker, B, the intelligent apparatus D1 of panel switches, D2, D3, D4; All intelligent apparatus A, B, D1, D2, D3, D4 are through network communication, and characteristics of the present invention are:
When intelligent apparatus judges that fault occurs on the distribution line between the panel switches; Occur in the K1 place such as fault; Then the intelligent apparatus D1 of the contiguous panel switches in the fault upper reaches sends block signal to the intelligent apparatus A of the outlet breaker DLA of this side transformer station; Simultaneous faults both sides panel switches DL1, the intelligent apparatus D1 of DL2, D2 send trip signal, realize Fault Isolation; After the intelligent apparatus of the outlet breaker DLA of this side transformer station receives this block signal; Protection is returned immediately; And the time-delay of T5=200ms is set automatically, between this time delay in the outlet breaker intelligent apparatus A of transformer station do not send out trip signal (transformer station's outlet breaker is failure to actuate) to transformer station's outlet breaker; When panel switches tripping operation in fault both sides finishes; The intelligent apparatus of section breaker sends the order of closing a floodgate (hypothesis panel switches DL3 is a section breaker in this example); After section breaker closed a floodgate, the distribution line at the section breaker upper reaches was by the power supply of offside transformer station, that is to say that panel switches DL3 closes a floodgate after; Load 4 changes the power supply by the B of transformer station into, so far accomplishes reconstruct;
Judge that when intelligent apparatus fault occurs between panel switches DL1 and the outlet breaker DLA of this side transformer station, the intelligent apparatus of the contiguous panel switches DL1 of the intelligent apparatus A of the outlet breaker DLA of this side transformer station and fault down stream sends trip signal; Finish when the contiguous panel switches DL1 of the outlet breaker DLA of this side transformer station and fault down stream closes tripping operation, the intelligent apparatus of section breaker sends the order of closing a floodgate, and after section breaker closed a floodgate, the distribution line at the section breaker upper reaches was supplied power by offside transformer station.
In the concrete implementation procedure of the present invention; Outlet breaker is experienced short circuit current when transformer station; The intelligent apparatus of transformer station's outlet breaker gets into defence program immediately; If the intelligent apparatus of transformer station's outlet breaker is received the block signal that any panel switches intelligent apparatus is sent except that adjacent panel switches intelligent apparatus at T1 in the time, then defence program returns immediately; Otherwise transformer station's outlet breaker intelligent apparatus with intrinsic operate time T4 start transformer station's outlet breaker tripping operation, T1 is intrinsic operate time of panel switches intelligent apparatus, 40ms < T4 < 50ms.T1 gets 30ms in this example, and T4 gets 45ms.
As shown in Figure 2; It is following that the present invention moves sequential: judge that when intelligent apparatus fault occurs on the distribution line between the panel switches, then the intelligent apparatus of the contiguous panel switches in the fault upper reaches sends block signal to the intelligent apparatus of this side transformer station outlet breaker constantly in T1, and said T1 is intrinsic operate time of intelligent apparatus; Get 30ms in this example; The intelligent apparatus of section breaker and T1+T2 send the order of closing a floodgate constantly, and T2 is that panel switches are carried out the time that tripping operation is experienced, and gets 60ms in this example; The nargin of the isolation and the time that restores electricity is T5-T2-T3; T3 sends the time that trip signal to section breaker is accomplished tripping operation for the section breaker intelligent apparatus; Get 90ms in this example, isolate so and the nargin of the time that restores electricity is T5-T2-T3=200ms-60ms-90ms=50ms.This 50ms nargin considers that mainly circuit breaker and panel switches are often slightly discrete operate time, guarantees that transformer station's outlet breaker is not still participated in this and isolated and action under discrete time is positive situation.
Except that the foregoing description, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.
Claims (4)
1. transformer station's overcurrent protection does not have the distribution network failure partition method of constant time lag; Composition comprises: the intelligent apparatus of transformer station's outlet breaker, panel switches, transformer station's outlet breaker, the intelligent apparatus of panel switches; All intelligent apparatus is characterized in that through network communication:
When intelligent apparatus judges that fault occurs on the distribution line between the panel switches; Then the intelligent apparatus of the contiguous panel switches in the fault upper reaches sends block signal to the intelligent apparatus of this side transformer station outlet breaker, and the intelligent apparatus of said fault both sides panel switches sends trip signal to panel switches simultaneously; After the intelligent apparatus of this side transformer station outlet breaker received said block signal, protection was returned immediately, and the time-delay of T5 is set automatically, between this time delay in transformer station's outlet breaker intelligent apparatus do not send out trip signal to transformer station's outlet breaker; Finish when fault both sides panel switches trip, the intelligent apparatus of section breaker sends the order of closing a floodgate, and after section breaker closed a floodgate, the distribution line at the section breaker upper reaches was supplied power by offside transformer station;
Judge that when intelligent apparatus fault occurs between panel switches and this side transformer station outlet breaker, the intelligent apparatus of the contiguous panel switches of the intelligent apparatus of this side transformer station outlet breaker and fault down stream sends trip signal; When the contiguous panel switches tripping operation of this side transformer station outlet breaker and fault down stream finishes, the intelligent apparatus of section breaker sends the order of closing a floodgate, and after section breaker closed a floodgate, the distribution line at the section breaker upper reaches was supplied power by offside transformer station.
2. transformer station according to claim 1 overcurrent protection does not have the distribution network failure partition method of constant time lag, it is characterized in that: T5=200ms.
3. transformer station according to claim 2 overcurrent protection does not have the distribution network failure partition method of constant time lag; It is characterized in that: outlet breaker is experienced short circuit current when transformer station; The intelligent apparatus of transformer station's outlet breaker gets into defence program immediately; If the intelligent apparatus of transformer station's outlet breaker is received the block signal that any panel switches intelligent apparatus is sent except that adjacent panel switches intelligent apparatus at T1 in the time, then defence program returns immediately; Otherwise transformer station's outlet breaker intelligent apparatus with intrinsic operate time T4 start transformer station's outlet breaker tripping operation, T1 is intrinsic operate time of panel switches intelligent apparatus, 40ms < T4 < 50ms.
4. transformer station according to claim 3 overcurrent protection does not have the distribution network failure partition method of constant time lag; It is characterized in that: when intelligent apparatus judges that fault occurs on the distribution line between the panel switches; Then the intelligent apparatus of the arbitrary panel switches in the fault upper reaches sends block signal to the intelligent apparatus of this side transformer station outlet breaker constantly in T1; Said T1 is intrinsic operate time of panel switches intelligent apparatus; The intelligent apparatus of section breaker sends the order of closing a floodgate constantly in T1+T2, and T2 is that panel switches are carried out the time that tripping operation is experienced; Isolate and the nargin of the time that restores electricity is T5-T2-T3, T3 sends the time that trip signal to section breaker is accomplished tripping operation for the section breaker intelligent apparatus, and this time nargin is used to remedy and disperses the operate time of circuit breaker and panel switches.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210168513.4A CN102709885B (en) | 2012-05-25 | 2012-05-25 | Method for isolating power distribution network fault without constant time lag in over-current protection of transformer substation |
| CN201410007727.2A CN103746354B (en) | 2012-05-25 | 2012-05-25 | One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210168513.4A CN102709885B (en) | 2012-05-25 | 2012-05-25 | Method for isolating power distribution network fault without constant time lag in over-current protection of transformer substation |
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| CN201410007727.2A Division CN103746354B (en) | 2012-05-25 | 2012-05-25 | One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in |
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| CN102709885A true CN102709885A (en) | 2012-10-03 |
| CN102709885B CN102709885B (en) | 2014-06-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451351A (en) * | 2016-04-29 | 2017-02-22 | 华北电力大学 | Logical judgment-based substation area protection system and method |
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2012
- 2012-05-25 CN CN201210168513.4A patent/CN102709885B/en not_active Expired - Fee Related
Patent Citations (5)
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| JPS5935527A (en) * | 1982-08-20 | 1984-02-27 | 株式会社日立製作所 | Time limit automatic cooperation pilot protecting relay system |
| US4631655A (en) * | 1984-12-24 | 1986-12-23 | Gte Communication Systems Corp. | Power distribution system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451351A (en) * | 2016-04-29 | 2017-02-22 | 华北电力大学 | Logical judgment-based substation area protection system and method |
| CN106451351B (en) * | 2016-04-29 | 2018-11-06 | 华北电力大学 | A kind of station domain protecting method that logic-based judges |
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Effective date of registration: 20150604 Address after: 210019, 03 west side of the 6 floor of Metro Science Park, No. 69 Olympic Sports Avenue, Jiangsu, Nanjing Patentee after: Nanjing GWDR Relays Technology Co., Ltd. Address before: 210019, 03 west side of the 6 floor of Metro Science Park, No. 69 Olympic Sports Avenue, Jiangsu, Nanjing Patentee before: Nanjing GWDR Relays Technology Co., Ltd. Patentee before: Gu Xinxin |
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Address after: 210019 Jiangsu Province, Nanjing high tech Development Zone, Lijing Road No. 20 building No. 2 room C110 D Patentee after: NANJING GWDR RELAYS TECHNOLOGY CO., LTD. Address before: 210019, 03 west side of the 6 floor of Metro Science Park, No. 69 Olympic Sports Avenue, Jiangsu, Nanjing Patentee before: Nanjing GWDR Relays Technology Co., Ltd. |
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