CN201590657U - Microcomputer directional current quick-break bus protection device - Google Patents
Microcomputer directional current quick-break bus protection device Download PDFInfo
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- CN201590657U CN201590657U CN2009203075752U CN200920307575U CN201590657U CN 201590657 U CN201590657 U CN 201590657U CN 2009203075752 U CN2009203075752 U CN 2009203075752U CN 200920307575 U CN200920307575 U CN 200920307575U CN 201590657 U CN201590657 U CN 201590657U
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- bus
- protection
- break
- directional current
- current
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Abstract
The utility model relates to the technical field of a power system relay protection, in particular to a microcomputer directional current quick-break bus protection device, which is adaptable to double-bus and single-bus sectional wiring type protection of power plants and transformer substations. The microcomputer directional current quick-break bus protection device is characterized in that a directional current quick-break protection CPU is arranged on the basis of a microcomputer bus protective hardware portion widely used at present; and the directional current quick-break protection CPU is used for memorizing and operating given current and voltage setting value, calculating amount and direction of acquired short-circuit current, comparing time of the acquired short-circuit current, detecting fault selectively, and sending fault warning signals. Differential protection operation program and movement logic are altered into operation program and movement logic of directional current quick-break protection, thereby avoiding dead zone fault or being affected by bus connection CT mounting position. The microcomputer directional current quick-break bus protection device has the advantages of simple principle, fast and convenient mounting and debugging, stronger selectivity when bus fault is caused between a bus connection breaker and a CT, capability of reducing power failure ranges and the like, thereby leading power network to run stably without being affected.
Description
Technical field
The utility model relates to a kind of relay protection of power system technical field, is applicable to that the double-bus of power plant and transformer station and single-trunk segmental wiring mode protect, i.e. microcomputer directional current quick-break type protection equipment for busbar.
Background technology
In the prior art, the bus of power plant and electric substation is the most important electric equipment of electric power system, is the pivot point that converges the energy, distribution load in the system.In case break down on the bus, it is stable that it may make electric power system lose, and large tracts of land user has a power failure and electric equipment is seriously damaged.Existing domestic what generally adopt is the differential-type bus protection, and this kind protection will lose selectivity when special operational mode appears in primary equipment and during the fault of bus dead band.Fault occurred between female connection (segmentation) circuit breaker and the female connection current transformer when so-called bus dead band fault was meant the bus paired running, circuit breaker side bus section tripping operation outlet can't be excised this fault, and the little poor element of bus section, busbar section that female connection current transformer is surveyed can not move.This moment, bus differential protection moved in I section bus, because the fault point still exists, big differential current component does not return, and female connection current transformer still has fault current, at this moment, and dead band protection action, excision dependent failure section bus.In such cases, bus protection will lose selectivity, and power network safety operation is brought adverse effect.
Be not difficult by analysis to find that main cause is that the bus protection design principle causes to cause dead band error protection action to lose optionally.BP-2B type protection equipment for busbar with existing extensive use is an example; female connection electric current belongs to through current during normal the operation, and not as big poor loop amount of calculation, only after the bus tripping; count little spill current fault amount handling procedure when selecting fault bus, realize selectivity.Following formula is calculated equation for the difference flowmeter: big spill current: I
d=I
1+ I
2+ ... + I
n, I is female little poor: I
D1=I
1S
11+ I
2S
12+ ... + I
nS
1n-I
KS
1K, II is female little poor: I
D1=I
1S
21+ I
2S
22+ ... + I
nS
2n+ I
KS
2K, as can be seen, the key point of problem is that female connection electric current counts the female fault distinguishing program of I, II; therefore between circuit breaker and current transformer during fault; bus protection loses selectivity, in order to eliminate this in esse hidden danger, is necessary bus protection is improved.
The utility model content
The purpose of this utility model is the microcomputer directional current quick-break type protection equipment for busbar that a kind of safeguard protection better effects if is provided at above-mentioned deficiency.
Technical solution of the present utility model is: microcomputer directional current quick-break type protection equipment for busbar is provided with directional current fast tripping protection CPU on the basis of existing widely used PC bus protection hardware components, be used for: a, memory also move given electric current, voltage setting value; B is when being short-circuited fault, and it is right that the short circuit current size and Orientation of gathering is calculated with time ratio; C, calculate the time difference between short circuit current and the setting value; The size of d, comparison of aforementioned two values; E, fault is selectively differentiated; F, open into state, judge the operational mode of primary system according to the isolating switch secondary contact of each unit; G, leave fault alarm signal.Needed is operation program and the action logic that differential protection operation program and action logic is changed to the directional current fast tripping protection, and reserve and auxiliary protection are constant.Design principle: at each access unit of bus the directional current fast tripping protection is set respectively, its positive direction is pointed to bus bar side, deviates from bus bar side in the other direction.The comprehensive directional current quick-break of bus is a starting component, and the selection element is that mother I, II maternal are to current quick-breaking.When bus is short-circuited fault, the comprehensive directional current quick-break action very first time of bus wants the tripping bus to separate the fault point, this moment, the sense of current of faulty section institute access unit all pointed to bus and amplitude greater than operating value, the then directional current quick-break of this each access unit of section action, the corresponding circuit breaker of tripping.With the current transformer of each Connection Element of bus, voltage transformer secondary amplitude, phase change microcomputer directional current fast tripping protection as the protection main criterion; mainly be that utilization electric current when bus is short-circuited fault raises, voltage reduces, these characteristics of preface component occur; in conjunction with Kirchhoff's current law (KCL), differentiate and whether on bus, break down.Be by the of ac detection module that respectively is connected in element on the bus in the protection, gather each cell voltage, current change quantity in real time.To gather the magnitude of current as actuating quantity, with the variation of voltage as barring condition, synchronised clock when short trouble takes place, compares the amplitude of the last cycle of each cell current fault cycle after fault and the position that phase change is come failure judgement point as with reference to amount.Point to bus simultaneously when current amplitude exceeds setting value and each unit three-phase current of the same name, when satisfying the voltage blocking conditional request, be judged as troubles inside the sample space.Otherwise arbitrary unit does not satisfy above-mentioned condition, then is judged as external area error, and protection is failure to actuate.Its action logic is after the action of the comprehensive directional current fast tripping protection of bus, be in the very first time tripping bus, to separate the fault point.Carry out mother I, the female fault distinguishing of II then.Female connection electric current was not counted in mother I, II maternal to current quick-breaking fault distinguishing program when the fooled bus of design was fixedly connected, had this shortcoming of dead band fault thereby eliminated the differential type bus protection.The quick-break of female connection directional current only connects at the bus on-fixed, when the double other female operational mode of bus occurs, enables just now.Female connection CT magnitude of current I
fThe normal protective device that inserts is as judging whether bus disconnects fully and start the opening into amount of exception handles.If adopt other CT electric current series connection of bus place to insert, then this CT can be used as standby winding fully.The main cause that does not adopt bus auxiliary contact or tripping position relay contact to judge that whether bus disconnects fully is to improve I, the II maternal quick-action to current quick.
The utility model has the advantages that: 1, differential protection operation program and action logic are changed to the operation program and the action logic of directional current fast tripping protection, no dead band fault, selectivity strengthens, and is applicable to various operational modes.2, be not subjected to the influence of female connection CT installation site.When 3, fixedly connected, mother is joined CT polarity does not have specific (special) requirements, can be according to on-the-spot actual, and select whether to use special-purpose mother to join CT or join the protection CT use of connecting with mother.4, it is simple to have a principle, installs, debugging is quick and easy and busbar fault when occurring between bus and the CT, and selectivity strengthens, and dwindles characteristics such as power failure scope, makes power network safety operation unaffected.
Below in conjunction with accompanying drawing execution mode of the present utility model is described in further detail.
Description of drawings
Fig. 1 is a directional current quick-break type bus protection systematic schematic diagram;
Fig. 2 is the utility model design principle figure;
Fig. 3 is a protection operation time limit analysis chart;
The double other female operational mode one protection action logic block diagram of Fig. 4 bus;
The double other female operational mode one protection actuating circuit schematic diagram of Fig. 4-1 bus;
The double other female operational mode two protection action logic block diagrams of Fig. 5 bus;
The double other female operational mode two protection actuating circuit schematic diagrams of Fig. 5-1 bus;
The female connection of Fig. 6 failure protection logic diagram;
The comprehensive directional current quick-break of Fig. 7 bus logic diagram.
Fig. 8 directional current quick-break type bus protection program flow diagram.
Embodiment
Referring to Fig. 1, microcomputer directional current quick-break type protection equipment for busbar is provided with directional current fast tripping protection CPU; Directional current fast tripping protection CPU is connected with TV filtering modulus circuit, TA filtering modulus circuit, photoelectricity to be kept apart into circuit, photoelectricity and isolates digital output circuit, photoelectricity isolated communication circuit and supervisor.By the of ac detection module that respectively is connected in element on the bus (TV filtering modulus) in the protection, gather each cell voltage, current change quantity in real time.To gather the magnitude of current as actuating quantity, with the variation of voltage as barring condition (blocking element CPU), synchronised clock when short trouble takes place, compares the amplitude of the last cycle of each cell current fault cycle after fault and the position that phase change is come failure judgement point as with reference to amount.Point to bus simultaneously when current amplitude exceeds setting value and each unit three-phase current of the same name, when satisfying the voltage blocking conditional request, be judged as troubles inside the sample space.Otherwise arbitrary unit does not satisfy above-mentioned condition, then is judged as external area error, and protection is failure to actuate.It is with luminescent device and the light-sensitive device coupled apparatus that partners that photoelectricity is kept apart into circuit function, be provided with same chip in, in order to coupling and the transmission of finishing the signal of telecommunication, and reach that the both sides signal is isolated on electric, the purpose of insulation.
Referring to Fig. 2, at each access unit of bus the directional current fast tripping protection is set respectively, its positive direction is pointed to bus bar side, deviates from bus bar side in the other direction.The comprehensive directional current quick-break of bus is a starting component, and the selection element is that mother I, II maternal are to current quick-breaking.When bus is short-circuited fault, the comprehensive directional current quick-break action very first time of bus wants the tripping bus to separate the fault point, this moment, the sense of current of faulty section institute access unit all pointed to bus and amplitude greater than operating value, the then directional current quick-break of this each access unit of section action, the corresponding circuit breaker of tripping.
The comprehensive directional current quick-break of bus: electric current criterion I
D1 (n)〉=I
ZDThe same BP-2B of voltage criterion
I
d2(n+1)≥I
ZD
Phase criterion Φ
d=Φ
I1=Φ
I3=Φ
II2=Φ
II4=Φ
I (n)=Φ
II (n+1)=0 °
The I maternal is to current quick-breaking: I
D1 (n)I
ZDThe same BP-2B of voltage criterion
Φ
I1＝Φ
I3＝Φ
I5-------＝Φ
I(n)＝0°
The II maternal is to current quick-breaking: I
D2 (n+1)〉=I
ZDThe same BP-2B of voltage criterion
Φ
II2＝Φ
II4＝Φ
II6-------＝ΦI
I(n+1)＝0°
Female connection directional current quick-break: I
Df〉=I
ZDPositive direction is pointed to Down Highway Φ
f=0 °
Wherein: I
D1 (n): the current value of female n the unit of I, I
D2 (n+1): the current value of female n+1 the unit of II, Φ
I (n): the current angle value of female n the unit of I, Φ
I (n+1): the current angle value of female n+1 the unit of II, I
ZD: directional current quick-break setting value, I
Df: female connection directional current quick-break actual act value, Φ
f: female connection current transformer actual current angle.
Female connection CT (female connection current transformer) magnitude of current I
fThe normal protective device that inserts is as judging whether bus disconnects fully and start the opening into amount of exception handles.If adopt other CT electric current series connection of bus place to insert, then this CT can be used as standby winding fully.The main cause that does not adopt bus auxiliary contact or tripping position relay contact to judge that whether bus disconnects fully is to improve I, the II maternal quick-action to current quick.It is the start-up time that the back fast tripping protection takes place fault.When the operational mode of other female operation occurs if bus is held concurrently (one section bus is the aircraft carrier line); bus protection will be enabled female connection directional current fast tripping protection by the pseudoinstruction; operational mode as this moment is that mother II is when circuit send electricity; then the comprehensive directional current quick-break of bus is out of service, and operation equation becomes: the II maternal is to current quick-breaking:
Electric current criterion I
D2 (n+1)〉=I
ZDThe same BP-2B of voltage criterion
I
df≥I
ZD
Phase criterion Φ
II2=Φ
II4=Φ
f=Φ
II (n+1)=0 °
As operational mode is that mother I is when circuit send electricity; bus protection is enabled female connection directional current fast tripping protection simultaneously by the pseudoinstruction; mother is joined CT polarity turn round 180 °; this moment, female connection CT was given tacit consent to the female element of I; the comprehensive directional current quick-break of bus is not out of service, and action logic is identical when fixedly connected.Operation equation is as follows:
The comprehensive directional current quick-break of bus: electric current criterion I
Df〉=I
ZDThe same BP-2B of voltage criterion
I
d2(n+1)≥I
ZD
Phase criterion Φ
d=Φ
II2=Φ
II4=Φ
f=Φ
II (n+1)=0 °
The I maternal is to current quick-breaking: electric current criterion I
Df〉=I
ZDThe same BP-2B of voltage criterion
Phase criterion Φ
f=0 °
The II maternal is to current quick-breaking: electric current criterion I
D2 (n+1)〉=I
ZDThe same BP-2B of voltage criterion
Phase criterion Φ
II2=Φ
II4=Φ
II6-------=Φ I
I (n+1)=0 °
Referring to Fig. 3, the operation time limit analysis chart of former, existing (before improving, after the improvement) two kinds of bus protections.Owing to adopt first tripping bus after the fault, after carry out fault point logic determines principle, the speed of excision fault point is prolonged to some extent.The increase time moves the time that disconnects fully to circuit breaker for protection, is about 42 ± 2ms.Then all be about 84 ± 2ms operate time, still can satisfy the requirement of quick-action.Cooperate with the II section time of adjacent lines simultaneously, also meet the demands.The above-mentioned time limit is the longest time limit of protective device and circuit breaker action, and the operation time limit of protective device will be worth much smaller than this when physical fault took place.The whole group of BP-2B type bus protection operate time＜15ms, ABB circuit breaker (HP245B1 type) intrinsic opening time＜17 ± 2ms, the arc extinction time is 10ms.
Referring to Fig. 4, Fig. 4-1; hold concurrently other female operational mode one protection action logic block diagram, circuit diagram of bus is as follows: during this kind operational mode; bus protection will be enabled the protection of female connection directional current fast tripping protection by the pseudoinstruction, withdraw from the comprehensive directional current quick-break of bus simultaneously.When the female d1 point of II was short-circuited fault, the II maternal reached female element down to current quick action tripping bus.When short trouble occurred between bus and the current transformer d2 point, the II maternal was failure to actuate to current quick-breaking, and behind bus protection action tripping bus itself, female connection CT should have electric current, then female element under the bus protection action tripping.
Referring to Fig. 5, Fig. 5-1, the double other female operational mode two protection action logic block diagrams of bus, circuit diagram: during this kind operational mode, bus protection is enabled female connection directional current fast tripping protection by the pseudoinstruction, simultaneously mother is joined CT polarity and turns round 180 °.When the comprehensive directional current fast tripping protection action of fault bus that is short-circuited of the female d1 point of I, tripping bus DL, this moment, the II maternal was failure to actuate to current quick-breaking, and the I maternal is to current quick action tripping I mother element.When short trouble occurs between bus and the current transformer d3 point, the comprehensive directional current fast tripping protection action of bus tripping bus DL, this moment, the I maternal was failure to actuate to current quick-breaking.II mother current fast tripping protection action is not returned, and the II section time limit of failure removal by the offside protection is with the tripping of offside circuit breaker.
Referring to Fig. 6, female connection failure protection logic diagram: when bus is short-circuited fault, after the comprehensive directional current quick-break action of bus; delay time through 50ms; female connection CT should have electric current, and to be judged as bus greater than malfunctioning current setting malfunctioning when this electric current, all elements of tripping bus.
Referring to Fig. 7; the comprehensive directional current quick-break of bus logic diagram: when bus normally moves; no matter fault occurs in mother I or mother II; after the comprehensive directional current fast tripping protection action of bus, the very first time is jumped bus, detects female connection current transformer electric current simultaneously; there is not stream proof bus really to disconnect; start I mother and II maternal then respectively to the current quick operation program, select fault bus, and with all the element trippings on the fault bus.
Referring to Fig. 8; directional current quick-break type bus protection program flow diagram: by the electric parameters acquisition system; detecting electric parameters in real time changes; when short trouble takes place, enter exception handles at once, as be judged as troubles inside the sample space; tripping bus then; carry out the female fault distinguishing of I, II subsequently, select fault bus after, all elements on this bus of tripping immediately.
Claims (1)
1. a microcomputer directional current quick-break type protection equipment for busbar is characterized in that being provided with directional current fast tripping protection CPU; Directional current fast tripping protection CPU is connected with TV filtering modulus circuit, TA filtering modulus circuit, photoelectricity to be kept apart into circuit, photoelectricity and isolates digital output circuit, photoelectricity isolated communication circuit and supervisor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203075752U CN201590657U (en) | 2009-08-07 | 2009-08-07 | Microcomputer directional current quick-break bus protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203075752U CN201590657U (en) | 2009-08-07 | 2009-08-07 | Microcomputer directional current quick-break bus protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201590657U true CN201590657U (en) | 2010-09-22 |
Family
ID=42750451
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203075752U Expired - Fee Related CN201590657U (en) | 2009-08-07 | 2009-08-07 | Microcomputer directional current quick-break bus protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201590657U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009449A (en) * | 2014-05-13 | 2014-08-27 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN105098736A (en) * | 2014-05-07 | 2015-11-25 | 中国石油化工股份有限公司 | Buscouple protection method with outgoing line reactor |
| CN114498540A (en) * | 2022-02-07 | 2022-05-13 | 华能铜川照金煤电有限公司 | Auxiliary protection on-line setting and control method for plant power distribution system |
-
2009
- 2009-08-07 CN CN2009203075752U patent/CN201590657U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098736A (en) * | 2014-05-07 | 2015-11-25 | 中国石油化工股份有限公司 | Buscouple protection method with outgoing line reactor |
| CN105098736B (en) * | 2014-05-07 | 2017-10-20 | 中国石油化工股份有限公司 | A kind of mother guard method with outlet reactor |
| CN104009449A (en) * | 2014-05-13 | 2014-08-27 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN104009449B (en) * | 2014-05-13 | 2017-05-03 | 龙滩水电开发有限公司 | 3 kV-10 kV bus protection and failure protection method |
| CN114498540A (en) * | 2022-02-07 | 2022-05-13 | 华能铜川照金煤电有限公司 | Auxiliary protection on-line setting and control method for plant power distribution system |
| CN114498540B (en) * | 2022-02-07 | 2024-03-19 | 华能铜川照金煤电有限公司 | Auxiliary protection online setting and control method for power distribution system for factory |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100922 Termination date: 20130807 |