CN103580006A - CT broken line discrimination method during bus protection - Google Patents
CT broken line discrimination method during bus protection Download PDFInfo
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- CN103580006A CN103580006A CN201210250042.1A CN201210250042A CN103580006A CN 103580006 A CN103580006 A CN 103580006A CN 201210250042 A CN201210250042 A CN 201210250042A CN 103580006 A CN103580006 A CN 103580006A
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Abstract
The invention discloses a CT broken line discrimination method during bus protection. The CT broken line discrimination method determines whether a CT broken line fault occurs during bus protection by determining current fault components such as zero sequence and negative sequence currents of each unit of a protection device connected with a bus, one specific unit which has the fault can be accurately determined, so a broken line problem of a voltage loop because of voltage acquisition is avoided like a current loop, influence factors are reduced, the device is greatly simplified, cost is reduced, and reliability is improved.
Description
Technical field
The present invention relates to bus protection technology, more particularly, relate to CT broken string method of discrimination in a kind of bus protection.
Background technology
Bus refers to the good copper of electric conductivity, aluminum makes the equipment in order to distribution and electric energy transmitting, is the total trunk of change/power distribution station electric energy transmitting.By bus, can give each user or other change/power distribution station by the power delivery of the outputs such as generator, transformer.
Bus protection is the visual plant that guarantees power network safety operation, and its fail safe, reliability, sensitivity and rapidity have decisive meaning to guaranteeing the safety and stability of whole regional power grid.
Up to now; the mother current ratio phase formula differential protection of extensive use in electrical network, current phase comparison formula differential protection, ratio brake formula differential protection; through each, power supply unit operation of power networks for many years summary of experience; generally believe with regard to adapting to the aspects such as bus running manner, fault type, transition resistance, press beyond doubt the ratio brake formula bus current differential protection best results that differential current principle forms.Ratio brake formula bus current differential protection electrical wiring schematic diagram as shown in Figure 1; on bus, the secondary side current of the current transformer of each unit is introduced the current channel of each unit of protection equipment for busbar by control cables, and the trip(ping) circuit that bus protection action outlet actuating signal is introduced each unit breaker of bus by control cables makes each circuit breaker trip.The differentiation logic of the difference element of each phase of bus protection is: get the absolute value of vector of each cell current as differential current; get each unit absolute value sum as stalling current; when the differential criterion of arbitrary phase meets " entry condition (being differential current >=differential definite value) " and " operation condition (differential current-stalling current * restraint coefficient >=0) " simultaneously; be judged to " poor stream is out-of-limit ", differential protection action outlet tripping operation.From above-mentioned bus protection operating principle, in bus protection, the integrity of current circuit plays vital effect to the correct operation of protection equipment for busbar.Under following situations, CT(all likely occurring is current transformer) circuit breaking (disconnecting): in maintenance, finish CT brace not to be connected; In maintenance not from CT source to whole CT loop check, fastening, make CT secondary circuit and terminal, terminal connecting plate virtual connection, overlap and cause that sparklet, time have been grown to blow and break; Because scrap build is cut off CT loop and cable in loop complexity or other situations by mistake; CT loop is because of the loosening broken string that causes of the long-term generation of operation continuously nature; Because long aging generation fracture service time of CT secondary cable causes broken string.Above-mentioned CT broken string situation cannot be avoided again completely.For preventing that circuit breaking from causing bus protection malfunction, requiring can locking bus protection when there is CT circuit breaking.Simultaneously because bus protection CT no-load voltage ratio used is larger; the primary current of each unit is also larger; occur after CT broken string; the CT secondary circuit of open circuit has very high voltage, and the voltage at CT open circuit place is the highest, very easily by open circuit place, is started to have discharged and fights along the cable of opening a way to CT root burning-off; very easily cause that fire incident jeopardizes equipment and personal safety; once this just requires to occur CT broken string, need to send out in time alarm signal, and processed as early as possible.
Take domestic application more extensively, more advanced BP equipment series is example, adopts two kinds of methods to differentiate CT broken string in this protective device.A kind of method is to differentiate according to spill current, when spill current is out-of-limit and busbar voltage is normal, thinks CT broken string.Another kind method is to detect successively the three-phase current of each unit, if a certain phase or two-phase current are zero, and another two-phase or has load current mutually, thinks CT broken string.Above two kinds of methods are got the relation of "or", and after determining CT broken string, through delay lock bus differential protecting concurrent alarm signal, its CT broken string control principle drawing as shown in Figure 2.But there are the following problems for this technology, this technology will be used voltage, and voltage circuit also exists and the current circuit problem that similarly breaks, and influenced factor increases, and this device complexity is higher, and cost increases, and reliability significantly reduces.
Summary of the invention
For the above-mentioned shortcoming existing in prior art, the object of this invention is to provide in a kind of bus protection CT broken string method of discrimination, can effectively detect CT broken string, and locking bus protection send CT broken string alarm signal.
For achieving the above object, the present invention adopts following technical scheme:
CT broken string method of discrimination in this bus protection, comprises the following steps:
A. for bus arranges one, there is the protection equipment for busbar of current sequence components discriminating element and Logical Configuration element, and the CT input of each unit of protection equipment for busbar is connected with secondary cable medium with the output of the current transformer of each inlet wire on bus, segmentation, outlet;
B. utilize the CT electric current operational factor of each unit of protection equipment for busbar Real-time Collection, and carry out overcurrent discrimination;
If C. the existing zero sequence overcurrent in a certain unit of protection equipment for busbar has again negative phase-sequence overcurrent, other unit, all without negative phase-sequence overcurrent, is judged to this unit CT broken string simultaneously;
D. there is CT broken string arbitrary unit, and being judged to protection equipment for busbar has CT broken string, and sends alarm signal locking bus protection.
In step D, when judgement protection equipment for busbar has CT broken string, through time delay, control, then send alarm signal locking bus protection.
Described delay time is 5s～8s.
In technique scheme; whether in bus protection of the present invention, CT broken string method of discrimination adopts the current failure component (being zero sequence, negative-sequence current) of differentiating each unit of protective device contacting with bus to differentiate CT disconnection fault in bus protection; and can accurately determine specifically which unit of abort situation; thereby avoided also existing and the current circuit problem that similarly breaks because gathering the related voltage circuit of voltage; influenced factor reduces; device is significantly simplified; cost declines, and reliability improves.
Accompanying drawing explanation
Fig. 1 is the bus current differential protection electrical wiring schematic diagram of prior art;
Fig. 2 is the bus protection control principle drawing of prior art;
Fig. 3 is the FB(flow block) of CT broken string method of discrimination in bus protection of the present invention;
Fig. 4 is CT broken string discrimination principles figure of the present invention;
Fig. 5 is the discrimination principles figure of one embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, further illustrate technical scheme of the present invention.
Shown in Fig. 3, in bus protection of the present invention, CT broken string method of discrimination specifically comprises the following steps:
A. for bus arranges one, there is the protection equipment for busbar of current sequence components discriminating element and Logical Configuration element, and the CT input of each unit of protection equipment for busbar is connected with secondary cable medium with the output of the current transformer of each inlet wire on bus, segmentation, outlet;
B. the function of utilizing protection equipment for busbar self to have, carrys out the CT electric current operational factor of each unit of Real-time Collection, and carries out overcurrent discrimination;
If C. the existing zero sequence overcurrent in a certain unit of protection equipment for busbar has again negative phase-sequence overcurrent, other unit, all without negative phase-sequence overcurrent, is judged to this unit CT broken string simultaneously;
D. there is CT broken string arbitrary unit, and being judged to protection equipment for busbar has CT broken string, and sends alarm signal locking bus protection.
Certainly; if protection equipment for busbar breaks without CT; can judge again whether bus protection difference element moves that (that is: differential current is greater than differential current threshold definite value; and differential current is greater than the difference of stalling current and differential current and the product of restraint coefficient); as nothing is back to step B; if any, by bus protection action outlet tripping operation, realize bus protection.
It should be noted that, operating CT broken string only consider a certain unit one mutually or the situation of two-phase broken string, do not consider three-phase such extreme case that breaks.Like this, when a certain unit one mutually or during two-phase CT broken string, must there be zero sequence and negative-sequence current in this unit; and other unit is owing to breaking without CT; therefore the equal non-negative sequence current in other unit, being at this moment judged to this unit has CT broken string, and arbitrary unit has CT broken string to be judged to protection equipment for busbar and has CT broken string.
In addition, CT broken string false alarm, sends alarm signal locking bus protection through one section of time delay (by being greater than bus linkage unit backup protection maximum actuation time setting, being generally made as 5s～8s) when avoiding troubles inside the sample space or external area error.That is:
When bus protection troubles inside the sample space, because CT breakage lock device has time delay, therefore CT broken string has little time locking, bus protection energy regular event, can not send out CT disconnection signal yet;
When bus protection external area error, because CT breakage lock device has time delay, therefore CT broken string has little time to post a letter, corresponding main protection or backup protection energy regular event, can not send out CT disconnection signal yet.
Refer to shown in Fig. 4, in Fig. 4, the CT circuit breaking of unit 1 is differentiated flow process and is: it is that its binary condition is at 1 o'clock that the zero sequence overcurrent element of unit 1 and negative phase-sequence overcurrent element are all moved, with the binary condition of door 1 be 1; The negative phase-sequence overcurrent element of unit 2,3,4 is all that its binary condition is at 0 o'clock less than action, and the binary condition of NOR gate 2 is 1.When the state with door 1 and NOR gate 2 is 1, with the state of door 9 be 1, be now judged to the CT circuit breaking of unit 1.
The CT circuit breaking of unit 2 is differentiated flow process: it is that its binary condition is at 1 o'clock that the zero sequence overcurrent element of unit 2 and negative phase-sequence overcurrent element are all moved, with the binary condition of door 3 be 1; The negative phase-sequence overcurrent element of unit 1,3,4 is all that its binary condition is at 0 o'clock less than action, and the binary condition of NOR gate 4 is 1.When the state with door 3 and NOR gate 4 is 1, with the state of door 10 be 1, be now judged to the CT circuit breaking of unit 2.
The CT circuit breaking of unit 3 is differentiated flow process: it is that its binary condition is at 1 o'clock that the zero sequence overcurrent element of unit 3 and negative phase-sequence overcurrent element are all moved, with the binary condition of door 5 be 1; The negative phase-sequence overcurrent element of unit 1,2,4 is all that its binary condition is at 0 o'clock less than action, and the binary condition of NOR gate 6 is 1.When the state with door 5 and NOR gate 6 is 1, with the state of door 11 be 1, be now judged to the CT circuit breaking of unit 3.
The CT circuit breaking of unit 4 is differentiated flow process: it is that its binary condition is at 1 o'clock that the zero sequence overcurrent element of unit 4 and negative phase-sequence overcurrent element are all moved, with the binary condition of door 7 be 1; The negative phase-sequence overcurrent element of unit 1,2,3 is all that its binary condition is at 0 o'clock less than action, and the binary condition of NOR gate 8 is 1.When the state with door 7 and NOR gate 8 is 1, with the state of door 12 be 1, be now judged to the CT circuit breaking of unit 4.
Whole bus protection CT broken string is differentiated flow process: in unit 1,2,3,4 arbitrary unit CT broken string with door 9,10,11,12 in arbitrary while being 1 with a door state; or door 13 states are 1; be judged to and in bus protection, have CT circuit breaking; through delay cell 14(, for high-pressure system, generally can be made as 8s) after; whether by element 15 states, put 1 and go to post a letter and locking bus protection, by the state of supervision element 9,10,11,12, can accurately differentiate CT loop, each unit in bus protection has broken string situation.
The protection equipment for busbar that the model of take is below SEL-387 is example, and carries out according to Fig. 5 the CT broken string differentiation logical expression that concrete example is introduced the protection equipment for busbar shown in Fig. 1.
In logical expression, the implication of relevant character is described as follows:
50N11---unit 1 zero sequence overcurrent (getting A, B, C three-phase calculated value)
50N21---unit 2 zero sequence overcurrents (getting A, B, C three-phase calculated value)
50N31---unit 3 zero sequence overcurrents (getting A, B, C three-phase calculated value)
50N41---unit 4 zero sequence overcurrents (getting A, B, C three-phase calculated value)
50Q11---unit 1 negative phase-sequence overcurrent
50Q21---unit 2 negative phase-sequence overcurrents
50Q31---unit 3 negative phase-sequence overcurrents
50Q41---unit 4 negative phase-sequence overcurrents
S1V1, S1V2, S1V3, S1V4, S2V1---logical variable
The delay cell of S2V1PU---S2V1
The output variable of S2V1T---S2V1 after time delay
The CT circuit breaking logical expression of unit 1 is:
S1V1=50N11*50Q11*!(50Q21+50Q31+50Q41)
The CT circuit breaking logical expression of unit 2 is:
S1V2=50N21*50Q21*!(50Q11+50Q31+50Q41)
The CT circuit breaking logical expression of unit 3 is:
S1V3=50N31*50Q31*!(50Q11+50Q21+50Q41)
The CT circuit breaking logical expression of unit 4 is:
S1V4=50N41*50Q41*!(50Q11+50Q21+50Q31)
Bus protection CT circuit breaking logical expression is:
S2V1=S1V1+S1V2+S1V3+S1V4
Through time delay (S2V1PU=8s)
Bus protection CT circuit breaking is posted a letter and the logical expression of locking is: S2V1T
When bus protection CT broken string is posted a letter, S2V1T posts a letter, and by checking that in S1V1, S1V2, S1V3, S1V4, which is posted a letter, which cell failure can accurately differentiate is, thereby has realized the accurate location of bus protection CT broken string.
In sum, adopt CT broken string method of discrimination in bus protection of the present invention, there is following advantage:
1, without gathering voltage, to have avoided also existing and the current circuit problem that similarly breaks because gathering the related voltage circuit of voltage, influenced factor reduces, and device is significantly simplified, and cost declines, and reliability improves;
2, do not increasing under the prerequisite of hardware and reconfiguration line; make full use of that existing main flow Microcomputer Based Busbar Protection has to each cell current order component (negative phase-sequence, zero sequence) analytic function, powerful programming in logic configuration function and subdivision, minute phase current Presentation Function; realization is accurately located CT disconnection fault in protection equipment for busbar; can know fast which unit which break down mutually; effectively shorten fault handling time, the Accident prevention state of affairs further expands.
The analytic function of each cell current order component 3, utilizing, powerful programming in logic configuration function and subdivision, minute phase current Presentation Function, above function is more easily realizing in main flow Microcomputer Based Busbar Protection at present, therefore has stronger versatility.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, to the variation of the above embodiment, modification, all will drop within the scope of claims of the present invention.
Claims (3)
1. a CT broken string method of discrimination in bus protection, is characterized in that,
Comprise the following steps:
A. for bus arranges one, there is the protection equipment for busbar of current sequence components discriminating element and Logical Configuration element, and the CT input of each unit of protection equipment for busbar is connected with secondary cable medium with the output of the current transformer of each inlet wire on bus, segmentation, outlet;
B. utilize the CT electric current operational factor of each unit of protection equipment for busbar Real-time Collection, and carry out overcurrent discrimination;
If C. the existing zero sequence overcurrent in a certain unit of protection equipment for busbar has again negative phase-sequence overcurrent, other unit, all without negative phase-sequence overcurrent, is judged to this unit CT broken string simultaneously;
D. there is CT broken string arbitrary unit, and being judged to protection equipment for busbar has CT broken string, and sends alarm signal locking bus protection.
2. CT broken string method of discrimination in bus protection as claimed in claim 1, is characterized in that:
In step D, when judgement protection equipment for busbar has CT broken string, through time delay, control, then send alarm signal locking bus protection.
3. CT broken string method of discrimination in bus protection as claimed in claim 2, is characterized in that:
Described delay time is 5s～8s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210250042.1A CN103580006A (en) | 2012-07-19 | 2012-07-19 | CT broken line discrimination method during bus protection |
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| CN201210250042.1A CN103580006A (en) | 2012-07-19 | 2012-07-19 | CT broken line discrimination method during bus protection |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383292A (en) * | 2016-10-09 | 2017-02-08 | 中国电力科学研究院 | Current transformer disconnection judgment method based on fault escape |
| CN106877285A (en) * | 2017-03-24 | 2017-06-20 | 山东中实易通集团有限公司 | The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection are not configured |
| CN107947128A (en) * | 2017-12-28 | 2018-04-20 | 长园深瑞继保自动化有限公司 | The quick method judged and select busbar CT broken string branches |
| CN109149528A (en) * | 2018-10-10 | 2019-01-04 | 广东电网有限责任公司 | A kind of comprehensive back-up protection method of bus and device |
| CN110556782A (en) * | 2018-05-31 | 2019-12-10 | 上海航空电器有限公司 | Terminal current transformer protection structure of single-channel multi-electric aircraft generator controller |
| CN111323671A (en) * | 2020-04-14 | 2020-06-23 | 国网湖北省电力有限公司武汉市新洲区供电公司 | Fault classifier for transient detection of power distribution system |
| CN114089250A (en) * | 2021-10-11 | 2022-02-25 | 国电南瑞科技股份有限公司 | Current transformer abnormity identification and processing method |
| CN115267621A (en) * | 2022-06-24 | 2022-11-01 | 北京天能继保电力科技有限公司 | Virtual connection judgment method and device for secondary circuit wiring terminal of power grid current transformer |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383292A (en) * | 2016-10-09 | 2017-02-08 | 中国电力科学研究院 | Current transformer disconnection judgment method based on fault escape |
| CN106383292B (en) * | 2016-10-09 | 2020-12-22 | 中国电力科学研究院有限公司 | Current transformer disconnection judging method based on fault escape |
| CN106877285A (en) * | 2017-03-24 | 2017-06-20 | 山东中实易通集团有限公司 | The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection are not configured |
| CN106877285B (en) * | 2017-03-24 | 2018-10-02 | 山东中实易通集团有限公司 | The station-service subsidiary engine CT thread-breakage protectings and relay system of differential protection is not configured |
| CN107947128A (en) * | 2017-12-28 | 2018-04-20 | 长园深瑞继保自动化有限公司 | The quick method judged and select busbar CT broken string branches |
| CN110556782A (en) * | 2018-05-31 | 2019-12-10 | 上海航空电器有限公司 | Terminal current transformer protection structure of single-channel multi-electric aircraft generator controller |
| CN110556782B (en) * | 2018-05-31 | 2022-11-04 | 上海航空电器有限公司 | Terminal current transformer protection structure of single-channel multi-electric-aircraft generator controller |
| CN109149528A (en) * | 2018-10-10 | 2019-01-04 | 广东电网有限责任公司 | A kind of comprehensive back-up protection method of bus and device |
| CN109149528B (en) * | 2018-10-10 | 2019-11-19 | 广东电网有限责任公司 | A kind of comprehensive back-up protection method of bus and device |
| CN111323671A (en) * | 2020-04-14 | 2020-06-23 | 国网湖北省电力有限公司武汉市新洲区供电公司 | Fault classifier for transient detection of power distribution system |
| CN114089250A (en) * | 2021-10-11 | 2022-02-25 | 国电南瑞科技股份有限公司 | Current transformer abnormity identification and processing method |
| CN115267621A (en) * | 2022-06-24 | 2022-11-01 | 北京天能继保电力科技有限公司 | Virtual connection judgment method and device for secondary circuit wiring terminal of power grid current transformer |
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