CN103746356A - Digital communication current protection technology based on IEC 61850 protocol - Google Patents
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Abstract
The present invention relates to a digital communication current protection technology based on an IEC 61850 protocol. The digital communication current protection technology based on the IEC 61850 protocol comprises the measures of a substation-in GOOSE network tripping operation, a station-between GOOSE network tripping operation, etc., and is characterized in that the concrete protection technology of the digital communication current protection technology applied to a protection scheme is that a substation-in protection device exchanges the overcurrent starting GOOSE signals of the devices via a station-in GOOSE network, thereby realizing a GOOSE tripping function; for the station-between GOOSE network tripping operation, a station-between network tripping mechanism and a station-in network tripping mechanism are used as the looped network breakers, and share a GOOSE starting signal; the failure intertrip protection is started by the miss judgement logics of the breakers; for an anti-maloperation anti-miss measure, the GOOSE network is disconnected or is interfered by communication, so that the devices are operated mistakenly. The digital communication current protection technology based on the IEC 61850 protocol of the present invention realizes the GOOSE communication of the protection devices in the substations and between the substations, can realize the GOOSE application in the same one substation, also can realize a function of rapidly positioning and eliminating a fault of a looped network cable by the matching of the protection devices among different substations, thereby satisfying the selective protection requirement.
Description
Technical field
The present invention relates to urban track traffic medium-pressure electricity supply system protection technology, relate in particular to a kind of communication current resist technology based on IEC61850 stipulations.
Background technology
In recent years, in the track traffic of domestic city, no matter pressure ring net is little ring network power supply mode, or large ring network power supply mode, mostly all adopts " configuration of optical-fiber longitudinal difference main protection+over-current backup protection " scheme.While there is alternate and earth fault in protection zone, optical-fiber longitudinal difference protection is as the main protection of looped network cable, can instantaneous operation (about a few tens of milliseconds), and tripping failure cable both sides circuit breaker.Because the principle of differential protection has determined the limitation of its protection range; protection range is only the loop grid between the current transformer of both sides; therefore using the backup protection of overcurrent protection as looped network cable short trouble; as the main protection of substation busbars short circuit, overcurrent protection operation time limit coordinates step by step simultaneously.For large ring network power supply mode; the time coordinations of standby overcurrent protection is difficult to meet the requirement of protection selectivity; can only adopt two or more electric substations line to share an operation time limit and meet differential cooperation of time limit; under failure condition, will cause a plurality of electric substations to have a power failure simultaneously; cause driving to be interrupted; affect passenger transport, social influence is larger.In addition, coordinate step by step the overcurrent protection operation time limit cause near power supply point place longer, be unfavorable for that fault excises fast.
Development along with the GOOSE network communications technology of IEC 61850 stipulations; support realizes urban track traffic medium-pressure electricity supply system and between protective device, interconnects and information sharing completely; thereby realize more high-grade defencive function; realizing quick selective tripping operation, is more advanced, perfect medium-pressure electricity supply system protection technology.
Summary of the invention
The technical problem to be solved in the present invention is a kind of protection scheme of design, and it should be able to adapt to 10 ~ 15 grades of more multistage serial electric power systems even, and the performance of this protection scheme can not reduce because of the increase of power supply progression.Protection scheme should have " absolutely selective ", does not make fault coverage expand, and should be able to automatically adapt to " normal power supply " and " supporting power supply " two kinds of operational modes, protects definite value not need to adjust when operational mode is switched.This protection scheme also should adopt forward-looking and advanced digital communication current protection technology.
In order to address the above problem; design a kind of digital communication current protection scheme based on IEC61850 stipulations; comprise that in institute, the choosing of GOOSE network is jumped; between standing, the choosing of GOOSE network is jumped; malfunctioning jumping; the anti-tripping measure of faulty action preventing, the digital communication current protection technology described in it is characterized in that is applied in this protection scheme, and concrete resist technology is as follows:
1. in institute, GOOSE network choosing is jumped, the looped network such as 1DL, 2DL line circuit breaker place layout line line protection device wherein, and the circuit breaker place configuration protection equipment for transformers such as 3DL, 4DL, 5DL, 7DL, 6DL place configures automatic switching device of standby power supply.In the overcurrent of protective device by each device of GOOSE network exchange in station start GOOSE signal, thereby realize GOOSE choosing, jump function;
2. between station, the choosing of GOOSE network is jumped, as looped network circuit breaker, between the station of 6DL, GOOSE choosing jumping protection range is the looped network cable between 6DL, 7DL, it is identical that overcurrent startup GOOSE signal logic and the overcurrent in station of 6DL starts GOOSE signal logic, and between standing, in network choosing jumping and station, shared same GOOSE enabling signal is jumped in network choosing;
3. malfunctioning jumping protection is started by circuit breaker tripping decision logic, by GOOSE network, transmits trip signal to higher level's circuit breaker, and by the action of higher level's circuit breaker, on behalf of excision fault, as long as satisfy condition, malfunctioning jumping can join step by step jumps until condition does not meet;
4. the anti-tripping measure of faulty action preventing; need to be based upon on GOOSE communication infrastructure by the network choosing jumping protection scheme based on GOOSE; GOOSE net breaks or is subject to Communication Jamming and can cause error action of device, and protection scheme is jumped in network choosing must take appropriate measures to improve the reliability of protection.
The invention has the beneficial effects as follows: realized the GOOSE communication of protective device between Nei He electric substation of electric substation; not only can realize the GOOSE application in same electric substation; can also realize by the cooperation of protective device between different electric substations " fault fast positioning is excised fast " function of looped network cable, meet the requirement of protection selectivity.The independent networking of GOOSE network, 100Mbps bandwidth is only for the GOOSE signal between conveyer, and support " the two nets of optical fiber " scheme, and between institute, cascade interface is 1000Mbps monomode fiber interface, institute's spacing can reach 10 kilometers, and communication speed is fast, reliability is high, antijamming capability is strong.In institute and between adjacent electric substation, interlock and realize by GOOSE signal, GOOSE signal transmission time is less than 5ms, is better than traditional hardwire crosslinking lock scheme.GOOSE distinctive " chain rupture testing mechanism " can find fast and accurately the communication failure of GOOSE network and accurately judge the position of fault point.The network choosing of GOOSE net broken string rear section device is jumped function and will be blocked with faulty action preventing, opens the alternative protection of one section of traditional overcurrent protection before as networking fault restoration simultaneously.Realized take in GOOSE " network choosing jump " the protection quick main protection of bus that is principle, protective device moves the outlet time and is less than 50ms.Realized take between GOOSE " network choosing jump " protection protect fast for the looped network cable of principle, protective device moves the outlet time and is less than 50ms.By between GOOSE communication and institute GOOSE communicate by letter and realized multistage " malfunctioning jumping " defencive function between installing.All GOOSE choosings are jumped protection and are not used power directional element as assistant criteria.The technical scheme of the present invention's design can obtain significant Social benefit and economic benefit after promoting the use of.Adopt after the technical program, in looped network cable fault situation, the localization of faults fast and accurately is also excised fault section, reduce fault outage scope, shorten interruption duration, farthest reduce the impact on driving, improve conevying efficiency, there is significant social benefit.Adopt after the technical program, failure condition can excise fault in a short period of time, with respect to traditional overcurrent protection fault clearing time, greatly shortens, and is conducive to guarantee power supply unit safety, improves electric power system reliability.Adopt after the technical program, GOOSE transmission has substituted traditional secondary cable connection, and secondary connection is simple, and operating repairs workload significantly reduces, and is beneficial to the raising efficiency of management.Along with scientific and technical development and progress, digital transformer substation becomes future thrust, and the technical program is based upon on IEC61850 communication protocol basis, meets Automation Technology of Digitized Transformer needs and developing direction completely.In addition; in the track traffic of domestic city, pressure ring net cable protecting device all adopts the protection equipment of external famous brand name at present; home brands protection equipment there is no to be promoted the use of; adopt after the technical program; domestic protection equipment can be a large amount of be applied in urban track traffic; pressure ring net cable protection home-made equipment degree in can greatly improving, reduces protection equipment investment, has significant economic benefit.
Accompanying drawing explanation
Fig. 1 is technical scheme front view of the present invention;
Tu2Wei electric substation operational mode and power direction schematic diagram;
Fig. 3 is that the network choosing of looped network circuit breaker of the present invention is beated and made logic diagram;
Fig. 4 is that looped network protection device for circuit breaker overcurrent of the present invention starts GOOSE signal logic figure;
Fig. 5 is that the network choosing of bus of the present invention is beated and made logic diagram;
Fig. 6 is that breaker protection is accepted GOOSE signal schematic representation;
Fig. 7 is that 6DL breaker protection is monitored GOOSE signal schematic representation;
Fig. 8 is the typical main wiring diagram of GOOSE choosing jumping between station;
Fig. 9 is GOOSE choosing jumping logic diagram between station;
Figure 10 is that failure protection GOOSE connection is jumped schematic diagram;
Figure 11 is malfunctioning enable logic figure;
Figure 12 is failure protection Trip Logic figure;
Figure 13 is malfunction tripping situation schematic diagram;
Figure 14 is GOOSE broken string faulty action preventing measure schematic diagram.
Embodiment
As shown in Figure 1, digital communication current protection scheme of the present invention mainly comprises that in institute, GOOSE network choosing is jumped, and between standing, the choosing of GOOSE network is jumped, and malfunctioning jumpings protected, and the anti-tripping measure of faulty action preventing is an each several part supplementary total solution mutually.
As shown in Figure 2, in institute, GOOSE network selects jumping scheme mainly to realize bus protection and tranformer protection.Suppose that electric substation's operational mode is: 1DL be looped network lead-in circuit breaker, 2DL be looped network wire-outgoing breaker, bus 6DL in co-bit, II section bus by I section bussed supply, 7DL in co-bit.
As shown in Figure 3, take 1DL as example, suppose that 1DL works as bus lead-in circuit breaker, after the A of 1DL phase current is greater than overcurrent protection definite value and the satisfied multiple press strip part of voltage, (B, C phase logic and zero-sequence current logical AND A are similar, no longer repeat specification), if do not receive " A starts GOOSE signal mutually " of any one transmission in 2DL, 3DL, 4DL, 5DL, 6DL in the delay time of fixed value adjusting, be judged as busbar fault, so " in standing, protection is jumped in choosing " action outlet excision fault of 1DL; If received " A starts GOOSE signal mutually " in delay time, be judged as external area error, the protection of 1DL is blocked, and fault is excised by other protective device.
As shown in Figure 4; take 2DL as example; suppose that 2DL works as bus outgoing circuit breaker; if the A phase current of 2DL is greater than " overcurrent startup definite value ", (overcurrent starts definite value and is generally less than overcurrent protection definite value; be greater than maximum load current), and circuit breaker position meets logic and requires without time delay, to send at once 2DL overcurrent and start GOOSE signal.
Protection equipment for transformer does not provide " action element is jumped in network choosing "; but there is tranformer protection function, comprising: three sections of specified time overcurrent protections, one section of inverse time lag overload protection, two sections of negative phase-sequence overcurrent protections (one section as open-phase protection, one section as unbalance protection), zero sequence overcurrent protection and non electrical quantity protection etc." overcurrent starts GOOSE signal " logical AND looped network protection device for circuit breaker of protection equipment for transformer is identical.
As shown in Figure 5, bus protective device is except having prepared auto restart function, and the also integrated defencive function of bus, comprising: network choosing is jumped protection, charge protection, closed after accelerated protection etc.Take the main electrical scheme structure shown in Fig. 2 as example explanation.(B after the A of 6DL phase current is greater than overcurrent protection definite value and the satisfied multiple press strip part of voltage, C phase logic and zero-sequence current logical AND A are similar, no longer repeat specification), if do not receive I section bus relevant apparatus (1DL in the delay time of fixed value adjusting, 2DL, 3DL, 4DL, any one "or" II section bus relevant apparatus (7DL 5DL), 8DL, 9DL), " A starts GOOSE signal mutually " of any one transmission is judged as: I section (or II section) busbar fault and 6DL are fault bus lead-in circuit breaker, " in standing, protection is jumped in choosing " action outlet excision fault of 6DL, if received that in delay time " A starts GOOSE signal mutually " of any one transmission in I section bus relevant apparatus (1DL, 2DL, 3DL, 4DL, 5DL) received again " A starts GOOSE signal mutually " of any one transmission in II section bus relevant apparatus (7DL, 8DL, 9DL), be judged as: line fault, the protection of 6DL is blocked, and fault is excised by other protective device.
As shown in Figure 6, K1 point failure is bus outgoing fault, and fault current flows through 4DL and 1DL.Dotted line in Fig. 7 and arrow represent the direction of transfer of GOOSE signal.Phase-splitting fault current or zero-sequence current when 4DL circuit breaker place is greater than after " overcurrent startup definite value ", and the protective device of 4DL circuit breaker transmits 4DL overcurrent to 1DL at once and starts GOOSE signal; Meanwhile 1DL circuit breaker failure electric current is greater than after " overcurrent protection definite value ", and protection startup enters time delay (time delay definite value must be greater than GOOSE signal transmission time) the outlet stage; 1DL protective device is received after 4DL enabling signal, judges that fault is as bus external area error, and in 1DL station, network choosing is jumped to protect and is blocked.K1 point failure is excised by the protection of 4DL place configuration.K2 point failure is busbar fault; fault current only flows through 1DL circuit breaker; when 1DL circuit breaker failure electric current is greater than after " overcurrent protection definite value "; protection startup enters time delay (time delay definite value must be greater than GOOSE signal transmission time) the outlet stage; in delay time, fail to receive the GOOSE enabling signal of arbitrary subordinate circuit breaker in 2DL, 3DL, 4DL, 5DL, 6DL; delay time finishes, and is judged as busbar fault, 1DL protection action outlet excision fault.
As shown in Figure 7,6DL bus connection switch is monitored the GOOSE enabling signal of I section bus and all line switches of II section bus.During K3 point failure, fault current flows through 1DL and 6DL, and 6DL fault current is greater than overcurrent protection definite value, and voltage meets presses entry condition again, and protection startup enters time delay outlet section; Phase-splitting fault current or zero-sequence current when 1DL circuit breaker place is greater than after " overcurrent startup definite value "; the protective device of 1DL circuit breaker transmits 1DL overcurrent to 6DL at once and starts GOOSE signal; " choosing of I section bus is jumped " of bus is blocked; but " choosing of II section bus is jumped " be not so because receive that the overcurrent startup GOOSE signal that in 7DL, 8DL, 9DL, any one circuit breaker sends is still open; delay time finishes to judge that fault is II section bus lead-in circuit breaker as II section busbar fault and 6DL afterwards, trip protection outlet excision fault.
The II section bus outgoing fault of K4 point failure when to be II section bus support power supply by I section bus, 6DL is equivalent to II section bus service entrance switch, and 7DL is II section bus outlet switch, and fault current flows through 1DL, 6DL, 7DL.1DL choosing is jumped protection and is started GOOSE signal block by 6DL overcurrent; 6DL choosing is jumped protection because not only received the block signal of 1DL but also received the block signal of 7DL, and choosing is jumped logic and is judged as I section bus II section bus external area error, and fault is excised by the tranformer protection of 7DL.
As shown in Figure 8 and Figure 9, between standing, GOOSE choosing is jumped only for optionally excising looped network cable fault, and as looped network circuit breaker, between the station of 6DL, GOOSE choosing jumping protection range is the looped network cable between 6DL, 7DL.As looped network circuit breaker, the overcurrent of 6DL startup GOOSE signal logic is identical with overcurrent startup GOOSE signal logic in station, and between standing, in network choosing jumping and station, network selects and jumps shared same GOOSE enabling signal, and enabling signal logic as shown in Figure 4.
As shown in Figure 8, stand between network choosing jump and take a pair of looped network circuit breaker and realize as unit.When K2 point failure, fault current only flows through 6DL circuit breaker.When 6DL phase-splitting fault current or zero-sequence current are greater than " overcurrent protection definite value " and voltage meets after multiple press strip part; between standing, protection startup is jumped in GOOSE choosing; enter time delay outlet section; the overcurrent of not receiving 7DL circuit breaker in delay time starts GOOSE signal; after finishing, delay time is judged as ring network fault, 6DL protection action outlet excision fault.When K3 point failure, fault current flows through 6DL and 7DL circuit breaker.When 6DL protection enters after time delay outlet section; because of 7DL phase-splitting fault current or zero-sequence current is greater than " overcurrent startup definite value " and circuit breaker position meets logic requirement; 7DL transmits GOOSE enabling signal to 6DL at once, and 6DL receives after the enabling signal that 7DL sends at once choosing between locking station and jumps protection.K2 point failure is jumped excision by GOOSE choosing in the station of 7DL.
Network choosing is jumped protection and is had natural emergency function step by step.K2 point failure equally; suppose 6DL protection device for circuit breaker in blocking or because of reasons such as power-off, cannot normally work; in the station of 5DL, choosing is jumped protection and will do not moved and excise fault because receiving the block signal of 6DL, and operate time is identical operate time with 6DL choosing jumping.Now in the station of 5DL, choosing jumping protection is equivalent to select and jump the backup protection of protecting between 6DL station.If during K2 point failure, 6DL protection device for circuit breaker is working properly but can not excise fault because of circuit breaker tripping, and malfunctioning jumping protection starts.
As Figure 10, shown in Figure 11 and Figure 12, malfunctioning jumping protection is started by circuit breaker tripping decision logic, by GOOSE network, transmits trip signal to higher level's circuit breaker, by higher level's circuit breaker, is moved on behalf of excision fault.As long as satisfy condition, malfunctioning jumping can join step by step jumps until condition does not meet.K4 point failure, if 9DL breaker failure fails to excise fault in delay time, meets shown in Figure 12 and to GOOSE net, broadcasts the malfunctioning enabling signal of 9DL at once after malfunctioning enable logic.According to breaker failure, be equivalent to this principle of busbar fault, 7DL, 8DL and bus connection switch receive after the malfunctioning enabling signal that 9DL sends, and protection will, according to the outlet of trip after short time delay of the Trip Logic of failure protection shown in Figure 12, also be isolated failure removal.If the tripping again of 7DL circuit breaker, 6DL, 8DL and bus connection switch are by the malfunctioning jumping GOOSE signal of receiving that 7DL sends, and action logic is identical.
As shown in figure 13, GOOSE choosing is jumped and be take GOOSE communication as basis, the networking protection scheme that the logical interlock of take is core.Between protective device, by GOOSE, netting what transmit is " protection blocking signal ", so GOOSE net broken string or block signal is disturbed will cause " protection malfunction or tripping ".During K2 point failure, if the GOOSE net broken string between 4DL, 5DL protective device, 4DL protection is because receiving 5DL block signal " malfunction "; During K1 point failure, because Communication Jamming 4DL protective device receives the block signal of 5DL mistakenly, 4DL protects tripping.
As shown in figure 14, GOOSE network has chain rupture measuring ability, can find in the short period of time the disconnection fault of GOOSE net and judge breakpoint location.When protective device detects after GOOSE network outage, protection blocking is jumped in GOOSE choosing, and opens one section of for example, compared with long delay (150ms) overcurrent protection interim alternative main protection as GOOSE choosing jumping protection simultaneously.Take Figure 14 as example, and the looped network optical cable broken string between 6DL and 7DL causes GOOSE net broken string, and protection blocking is jumped in the GOOSE choosing of 6DL circuit breaker configuration; Open one section of 150ms time delay (delay time can the be adjusted) overcurrent protection in 6DL place is simultaneously as the interim alternative main protection of K1 point failure.If K5 point failure outside district now, protection is jumped in the GOOSE of 6DL place choosing can because can not receive the block signal that 7DL sends, malfunction expand power failure range; If K2 point failure in district, fault will can be adjusted by the 150ms(delay time of 6DL place configuration) time delay overcurrent protection action excision fault.The core concept of this scheme is when communication failure, and " quick-action " and " selectivity " that by " appropriateness ", reduce protection exchanges " reliability " of protection for, thereby realizes the balance of protection scheme " four property ".
The interference protection measure of taking mainly comprises selects the high-quality switch of technical grade, and switch should pass through strict electromagnetic compatibility test, has network storm inhibit feature, meets IEC 61850-3 standard, operating temperature range :-40 ℃ ~+85 ℃.Adopt optical fiber networking, GOOSE communication protocol has had very strong antijamming capability by measures such as software effects, adopts the strong optical-fibre channel of antijamming capability can further promote the reliability of communication.Adopt two net networking modes, single net broken string does not affect communication, and reliability is higher.Select the ripe protective device with extensive IEC 61850 application achievements.
Claims (1)
1. the digital communication current protection technology based on IEC61850 stipulations; comprise that in institute, the choosing of GOOSE network is jumped; between standing, the choosing of GOOSE network is jumped; malfunctioning jumping; the anti-tripping measure of faulty action preventing; digital communication current protection technology described in it is characterized in that is applied in this protection scheme, and concrete resist technology is as follows:
In institute, the choosing of GOOSE network is jumped, the looped network such as 1DL, 2DL line circuit breaker place layout line line protection device wherein, the circuit breaker place configuration protection equipment for transformers such as 3DL, 4DL, 5DL, 7DL, 6DL place configuration automatic switching device of standby power supply, in the overcurrent of protective device by each device of GOOSE network exchange in station start GOOSE signal, thereby realize GOOSE choosing, jump function;
Between standing, the choosing of GOOSE network is jumped, as looped network circuit breaker, between the station of 6DL, GOOSE choosing jumping protection range is the looped network cable between 6DL, 7DL, it is identical that overcurrent startup GOOSE signal logic and the overcurrent in station of 6DL starts GOOSE signal logic, and between standing, in network choosing jumping and station, shared same GOOSE enabling signal is jumped in network choosing;
Malfunctioning jumping protection is started by circuit breaker tripping decision logic, by GOOSE network, transmits trip signal to higher level's circuit breaker, and by the action of higher level's circuit breaker, on behalf of excision fault, as long as satisfy condition, malfunctioning jumping can join step by step jumps until condition does not meet;
The anti-tripping measure of faulty action preventing; need to be based upon on GOOSE communication infrastructure by the network choosing jumping protection scheme based on GOOSE; GOOSE net breaks or is subject to Communication Jamming and can cause error action of device, and protection scheme is jumped in network choosing must take appropriate measures to improve the reliability of protection.
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Cited By (6)
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| CN106159917B (en) * | 2016-08-16 | 2018-08-07 | 国网江苏省电力公司无锡供电公司 | Power distribution network indulges the relay protection system of sequence accelerated motion |
| CN108493911A (en) * | 2018-05-02 | 2018-09-04 | 中铁第四勘察设计院集团有限公司 | Pressure ring network protection method in a kind of magnetic floating traffic |
| CN108923393A (en) * | 2018-06-22 | 2018-11-30 | 深圳市博源电力有限公司 | The method of the station internal fault isolation for institute's overall power distribution terminal of standing |
| CN110492466A (en) * | 2019-08-06 | 2019-11-22 | 南京南瑞继保工程技术有限公司 | A kind of urban track traffic direct-current traction power supply disconnecting switch interlock system and method |
| CN111725791A (en) * | 2020-06-18 | 2020-09-29 | 广州市扬新技术研究有限责任公司 | Method for realizing digital hop selection protection by differential optical fiber transmission GOOSE signal |
| CN116231597A (en) * | 2023-02-24 | 2023-06-06 | 中国电建集团北京勘测设计研究院有限公司 | Method for realizing relay protection blocking and preventing relay protection from refusing |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159917B (en) * | 2016-08-16 | 2018-08-07 | 国网江苏省电力公司无锡供电公司 | Power distribution network indulges the relay protection system of sequence accelerated motion |
| CN108493911A (en) * | 2018-05-02 | 2018-09-04 | 中铁第四勘察设计院集团有限公司 | Pressure ring network protection method in a kind of magnetic floating traffic |
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| CN108923393A (en) * | 2018-06-22 | 2018-11-30 | 深圳市博源电力有限公司 | The method of the station internal fault isolation for institute's overall power distribution terminal of standing |
| CN108923393B (en) * | 2018-06-22 | 2024-02-02 | 深圳市博源电力有限公司 | Method for isolating faults in station of station integrated power distribution terminal |
| CN110492466A (en) * | 2019-08-06 | 2019-11-22 | 南京南瑞继保工程技术有限公司 | A kind of urban track traffic direct-current traction power supply disconnecting switch interlock system and method |
| CN111725791A (en) * | 2020-06-18 | 2020-09-29 | 广州市扬新技术研究有限责任公司 | Method for realizing digital hop selection protection by differential optical fiber transmission GOOSE signal |
| CN116231597A (en) * | 2023-02-24 | 2023-06-06 | 中国电建集团北京勘测设计研究院有限公司 | Method for realizing relay protection blocking and preventing relay protection from refusing |
| CN116231597B (en) * | 2023-02-24 | 2023-08-22 | 中国电建集团北京勘测设计研究院有限公司 | Method for realizing relay protection blocking and preventing relay protection from refusing |
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Application publication date: 20140423 |