CN103326335B - System and method for false action resistance of distance section III based on domain double-type fault characteristic - Google Patents
System and method for false action resistance of distance section III based on domain double-type fault characteristic Download PDFInfo
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Abstract
The invention discloses a system and method for false action resistance of distance section III based on a domain double-type fault characteristic and belongs to the technical field of power system relay protection. The system comprises a protecting system fault characteristic module and a grid fault characteristic module. An upper-level section III protection condition is opened or locked by the protecting system fault characteristic module through a protecting system fault characteristic; the upper-level section III protection condition is opened or locked by the grid fault characteristic module through a grid fault characteristic, so that the protecting system fault characteristic module is effectively supplemented. Whether the operation is delayed or not is judged according to the motion criteria of the distance III section by the upper-level protecting device when a lower-level system is broken down. Meanwhile, whether the distance section III is opened or not is determined by the protecting system fault characteristic module and the grid fault characteristic module through the protecting system fault characteristic and the grid fault characteristic which are collected in a domain. The good false action resistant effect can be achieved, the false action resistant capacity and the chain tripping resistant capacity of the distance section III are effectively improved, the far-reserve function is improved, and the safe and effective operation of the system in a transitional period is guaranteed.
Description
Technical field
The present invention relates to a kind of III of Distance section faulty action preventing system and method based on the two class fault signature in region, belong to Relay Protection Technology in Power System field.
Background technology
Relaying protection is the first line of defence ensureing electric power netting safe running.In recent years along with electric network composition is day by day complicated, traditional backup protection is owing to only utilizing local information failure judgement, and its defect exposed day by day, while defencive function performance is not good, power grid security in serious threat.But the improvement that the particularity of relaying protection determines protection should progressively be carried out with innovation.Therefore realizing before backup protection principle thoroughly reforms, needing to find and be a kind ofly applicable to transitional period backup protection pattern safely and effectively.Current mainly exist contradiction between faulty action preventing and sensitivity about the measure of III of Distance section faulty action preventing and emergency function far away still needs the large major issue of reservation two.The III section of self-characteristic that for this reason need to adjust the distance improves, and makes it between sensitivity and reliability, find good balance point, or utilizes other householder method to carry out differentiation to overload and fault to make III segment protect not malfunction.
Current Chinese scholars achieves a large amount of useful achievement about the improvement of III of Distance section faulty action preventing measure, is mainly divided into 3 classes:
1) load limiting characteristics is increased in protection act characteristic
For directional impedance relay shown in Fig. 1, border circular areas 1 is the operating space of impedance relay, and region 2 is load impedance (comprising normal duty and overload) region.As seen from the figure, between the original activities region of directional relay and load impedance, there is overlapping region 3, if load invades in region 3 when circuit runs, directional relay malfunction will be caused.Load restraining line 1 and 2 is increased to this, jointly forms new protective feature region with region 1, then can effectively prevent from protecting overload mis-operation, and be that high resistive fault and emergency function far away retain as far as possible many motion spaces.
2) local assistant criteria prevents malfunction
The impedance relay of Fig. 1 circle characteristic itself cannot distinguish internal fault and overload well, can add extra assistant criteria distinguish this, such as:
I
2+I
0＞0.5I
1(1)
I in formula
1, I
2, I
0for protecting positive and negative, the zero-sequence current of installation place, U
1for positive sequence voltage,
for the angle of positive sequence voltage and forward-order current,
for line impedance angle.Formula (1), (2) are got or again with directional impedance relay phase with; then can start in unbalanced fault up-to-date style (1); symmetric fault up-to-date style (2) can start; and overload up-to-date style (1), (2) all do not start, thus play the effect preventing distance protection malfunction.
3) power flow transfer identification prevents malfunction
One of power flow transfer identification research direction belonging to wide area protection, its principle utilizes the synchronous electric quantity information measured in real time in electrical network, the electric network swim transfer case after computational scheme excision.If certain guard space III section of action near after circuit excision, then the Observed current data situation of change of action protection and the power flow transfer situation calculated are compared.If the two is consistent, then think that the action of this place's III of Distance section excises by front moment circuit the power flow transfer produced to cause, locking III of Distance section prevents malfunction immediately; If the two is inconsistent, then think that III section of action is caused by troubles inside the sample space, namely open distance III section is by Fault Isolation.
The advantage of above thinking is the reliability that all improve protection from different angles, but for first method, due to the complexity of actual electric network and the flexibility of operational mode, the measurement impedance of troubles inside the sample space and accident overload is made often to there is crossover region, when formulating load limiting characteristics, be difficult to find suitable balance point while guarantee internal fault sensitivity and faulty action preventing reliability; For second method, when utilizing the information of protection installation place self to arrange assistant criteria, when subordinate's element fault, because protection and fault point are apart from too far away, and the impact of other branch roads of distance station generation cannot be estimated, therefore how to ensure that the sensitivity of assistant criteria to subordinate's line fault need further research; For the third method, power flow transfer identification needs the synchronous electric quantity information gathering electrical network each node to calculate in conjunction with electric network element parameter, requires high to synchronous condition, information interaction and operand larger.
Summary of the invention
For the defect of above problem and the easy malfunction of traditional III of Distance section overload, the present invention proposes a kind of III of Distance section faulty action preventing system and method based on the two class fault signature in region.This invention is from the reality of electric power system; lay particular emphasis on perfect emergency function far away; utilize protection system fault signature and grid faults characteristics open distance III section in region; can realize before backup protection principle thoroughly reforms in electric power system; effective range of lift III section of faulty action preventing, anti-cascading trip ability; improve emergency function far away, ensure the safe and effective operation of transitional period system.
Based on the III of Distance section faulty action preventing system of the two class fault signature in region, this system comprises two modules: protection system fault signature module and grid faults characteristics module.Wherein, protection system fault signature module comprise to judge in subordinate station TV, TA whether broken string part, judge whether subordinate station and neighbor stations lose sync section, judge subordinate station and neighbor stations whether communication disruption part, judge subordinate station protective device whether disabling portion, judge whether partial information lacks or full detail interrupt unit subordinate station, this module utilizes protection system fault signature to realize opening to higher level's element III segment protect or locking; Grid faults characteristics module comprise grid faults characteristics module comprise judge III segment protect installation place and subordinate station export certain protection whether meet operating criterion part, judge subordinate station busbar voltage whether meet press condition part again, whether (comprising III section of place circuit) is in non-full-operating state part to judge a subordinate station outlet, this module utilizes grid faults characteristics realization to the opening of higher level's element III segment protect or locking.In this system, the fault characteristic information that protection system fault signature module and grid faults characteristics module utilize region main website to gather simultaneously, judges whether to meet protection system fault signature and grid faults characteristics respectively.Grid faults characteristics module is supplementing protection system fault signature module, can open equally when III of Distance segment protect is broken down in nearby sphere; Make that protection system reforms transitional III of Distance section faulty action preventing in backup protection principle, anti-cascading trip ability is improved further, emergency function far away improves.
Based on the III of Distance section faulty action preventing method of the two class fault signature in region, the method comprising the steps of:
Step 1: when lower system breaks down, higher level's protective device judges whether action according to III of Distance section operating criterion;
Step 2: what protection system fault signature module comprised judge in subordinate station TV, TA whether broken string part, judge whether subordinate station and neighbor stations lose sync section, judge subordinate station and neighbor stations whether communication disruption part, judge subordinate station protective device whether disabling portion, judge that the subordinate station fault characteristic information whether partial information lacks or full detail interrupt unit utilizes region main website to gather respectively judges protection system whether fault;
Simultaneously, judge that III segment protect installation place and subordinate station export certain protection and whether meet operating criterion part in grid faults characteristics module, judge that whether subordinate station busbar voltage meets and press condition part again, judge whether a subordinate station outlet (comprising III section of place circuit) is in non-full-operating state part and utilizes the fault characteristic information gathered in the main website of region to judge electrical network whether fault respectively;
Step 3:: the output signal of protection system malfunctioning module and grid faults characteristics module is done or computing, sends the locking of III of Distance section or open logical signal;
Step 4: in the actuating signal of step 1 middle distance III segment protect and step 3, logical signal does and computing, judging distance III section whether deferred action.
Concrete analysis of cases shows, III of Distance section faulty action preventing system and method based on the two class fault signature in region utilizes the principle of brief and practical can realize good faulty action preventing effect, effectively improve III of Distance section faulty action preventing, anti-cascading trip ability, perfect emergency function far away, ensure the safe and effective operation of transitional period system, its logic diagram as shown in Figure 2.
1. protection system fault signature module
Because III of Distance section is not will for the complete protection of subordinate's element self provides standby in sensitivity as the standby far away of subordinate's element, but will at subordinate's element autoprotection because the situation of improper reason inefficacy tripping provides standby for it.Therefore can using the abnormal condition of protection system as triggering; backup protection platform in region is utilized to gather the fault signature of subordinate station protection system to open the III of Distance section of higher level's element; so only need while the function giving full play to the backup protection of III of Distance section, the generation of overload mis-operation can be avoided largely by the principle of brief and practical.Wherein, protection system fault signature module comprises following:
1) to judge in subordinate station whether TV, TA break part
When in system, certain station TV, TA break; often need distance, current protection that locking is relevant; for non-latching protection, also relay fail may be caused because transformer disconnection measure error is large, therefore subordinate station transformer disconnection information feature can be started as one.TV, TA broken string has special identical criterion, and in transformer station, namely original protective device comprises this function, and therefore locality protection main frame repeats to differentiate without the need to carrying out, and the differentiation result at fault station can be uploaded for application.
2) judge whether subordinate station and neighbor stations lose sync section
Current ultra-high-tension power transmission line generally joins current differential protection as main protection, and current differential protection is simple with its principle, it is reliable to be active in one's movements, it is leading in the power line main protection of multiple principle to affect the advantage such as little by various factors.When certain subordinate station loses synchronous with neighbor stations, the current differential of respective lines will be blocked, for improving the reliability of failure removal, and now can be open by the III of Distance section at this station.
If along with the popularization and application of PMU, between station in the future, current differential synchronizing signal is provided by PMU device, or by " table tennis pair time method " between PMU device subsidiary discriminant station whether accurate synchronization, then also can using the fault message of PMU device or subsidiary discriminant result as losing synchronous characteristic signal except difference stream is out-of-limit.
3) subordinate station and neighbor stations whether communication disruption part is judged
Between two neighbor stations, communication disruption comparatively loses synchronously even more serious a kind of situation, and now all pilot protections of corresponding line will lose efficacy, and is necessary that open higher level's III of Distance section provides emergency function far away.
4) subordinate station protective device whether disabling portion is judged
When in standing, certain cover protective device lost efficacy, for the protective device of dual, wherein a set of inefficacy can reduce protection reliability, and for only there being a set of protective device, inefficacy will mean this relay fail.Therefore when learning that protective device lost efficacy, can by higher level's III section of opening.
5) judge whether partial information lacks or full detail interrupt unit subordinate station
This situation and feature 3) different, the communication failure of this situation mainly occurs in subordinate station own range.Partial information disappearance may be damage due to station communication network portion and cause, and at this moment in station, the protection of bus, transformer and this station outlet all can be affected, and should open higher level III section in support.Owing to being equipped with territory backup protection main frame in station in each station, territory main frame of standing is used for identification station internal fault by concentrating full station information, and therefore differentiation result by station territory Host Detection identification, and can be uploaded regional host computer by the feature of partial information disappearance.
2. grid faults characteristics module
Protection system fault signature module, achieves good faulty action preventing effect by the principle of brief and practical.If but the related elements of protective device breaks down, and just in time because undiscovered protection system fault causes the tripping of element autoprotection, then because III section is in blocking and can not provides emergency function far away for it, fault is caused to excise; On the other hand, when III of Distance section place line failure, even if this circuit is correlated with, protection system is sound runs, and still wishes that III of Distance section can be assisted and bears nearly emergency function, to increase the overall sensitivity of protection.
Therefore in order to improve reasonability and the practicality of this system further; except utilizing protection system fault signature open distance III section; also need to supplement the startup measure utilizing grid faults characteristics, can open equally when III of Distance segment protect is broken down in nearby sphere.Make that protection system reforms transitional III of Distance section faulty action preventing in backup protection principle, anti-cascading trip ability is improved further, emergency function far away improves.Wherein grid faults characteristics module comprises:
1) judge that III segment protect installation place and subordinate station export certain protection and whether meet operating criterion part
Formula (1) and (2) are one of measures of current III of Distance section faulty action preventing as start-up criterion when circuit unbalanced fault and symmetric fault.But when applying this criterion, due to platform restriction, information only picks up from III of Distance segment protect installation place in the past.
But on region backup protection platform, because regional host computer has possessed the ability of concentrated multi information, each outlet of subordinate station can be obtained and protect the fault signature reacted.Then when certain a bit breaks down, owing to meeting criterion (1) with the protection that is positioned at same circuit of changing the time, (2) can sensitive action, and by the III section of opening of higher level's route protection, realizes its emergency function far away.And the judgement of criterion (1), (2) is carried out in higher level's protection simultaneously, then contribute to when higher level's line fault by sensitive for III of Distance section opening, assist and bear nearly emergency function.
2) judge whether subordinate station busbar voltage meets and press condition part again
The multiple press strip part of bus is:
Multiple press strip part is made up of jointly phase low-voltage, negative sequence voltage and residual voltage criterion, and wherein negative phase-sequence and the residual voltage theoretical value when circuit overload is zero, can not malfunction.And bus minimum voltage is not less than 80% of rated voltage when it has been generally acknowledged that overload, therefore lower voltage components is adjusted as 0.7U
nthere is reliability.Press again criterion (3) can in subordinate station station sensitive action during element fault, higher level's III of Distance section is open, when standby far away being provided failure removal by III section during element protection tripping in standing.Press element also to have certain respond to outlet fault again simultaneously.
3) judge whether a subordinate station outlet (comprising III section of place circuit) is in non-full-operating state part
Voltage levels circuit is often furnished with single-pole reclosing, and non-three phase circuit zero-sequence voltage injection meeting locking during single-pole reclosing, the sensitivity of adjacent lines zero sequence current differential protection can decline.From two kinds of features are different, now there is not short trouble above, but due to protection system hydraulic performance decline, also can by the opening of higher level III segment protect with reply contingent fault at any time.Except single-phase coincidence, circuit breaker jump also can cause open-phase operation, can by same state processing.Because open-phase operation belongs to disconnection fault, therefore can as the one of grid faults characteristics.
Beneficial effect of the present invention: for the defect of current distance III section of faulty action preventing corrective measure Problems existing and the easy malfunction of traditional III of Distance section overload, the present invention proposes a kind of III of Distance section faulty action preventing system and method based on the two class fault signature in region.This invention is from the reality of electric power system; lay particular emphasis on perfect emergency function far away; utilize protection system fault signature and grid faults characteristics open distance III section in region; can realize before backup protection principle thoroughly reforms in electric power system; effective range of lift III section of faulty action preventing, anti-cascading trip ability; improve emergency function far away, ensure the safe and effective operation of transitional period system.First; when lower system breaks down; higher level's protective device judges whether action according to III of Distance section operating criterion, and simultaneously protection system fault signature module and grid faults characteristics module utilize the protection system fault signature that gathers in region and grid faults characteristics to determine whether open distance III section.Then, according to the whether deferred action of the output information judging distance III section of protection system fault signature module and grid faults characteristics module.Concrete analysis of cases shows, III of Distance section faulty action preventing system based on the two class fault signature in region utilizes the principle of brief and practical can realize good faulty action preventing effect, effectively improve III of Distance section faulty action preventing, anti-cascading trip ability, perfect emergency function far away, ensures the safe and effective operation of transitional period system.
Accompanying drawing explanation
Fig. 1 is III of Distance section load limiting characteristics schematic diagram.
Fig. 2 is III of Distance section faulty action preventing logical schematic provided by the present invention.
Fig. 3 is protection system fault signature schematic diagram.
Fig. 4 is III of Distance section faulty action preventing Example logic schematic diagram provided by the present invention.
Embodiment
Books invention is further illustrated below in conjunction with drawings and Examples.
Based on an III of Distance section faulty action preventing system for the two class fault signature in region, as shown in Figure 3, Fig. 3 is protection system fault signature schematic diagram.To protect the III of Distance section at 1 place, B
2stand as its subordinate station, then protect the III of Distance section faulty action preventing complete logical at 1 place to be expressed as Fig. 4.
1. protection system fault signature module
Backup protection platform in region is utilized to gather the fault signature of subordinate station protection system to open the III of Distance section of higher level's element.
1) certain TV, TA broken string in subordinate station
Work as B
2stand certain TV, TA broken string time (as Fig. 3 situation a); often need distance, current protection that locking is relevant; for non-latching protection, also relay fail may be caused because transformer disconnection measure error is large, therefore subordinate station transformer disconnection information feature can be started as one.
TV, TA broken string has special identical criterion, and in transformer station, namely original protective device comprises this function, therefore locality protection host B
0repeat to differentiate without the need to carrying out, can by B
2the differentiation result of standing is uploaded for application.
2) subordinate station loses synchronous with certain neighbor stations
Work as B
2stand and B
3when station loses synchronous (as Fig. 3 situation b), circuit L
3current differential will be blocked, be improve the reliability of failure removal, can the out-of-limit signal of difference stream as losing synchronous signal, and this signal is uploaded to main website B
0with the III of Distance section of open and protection 1.If difference stream is out-of-limit is broken by TA to cause, III section still can open.
3) subordinate station and certain neighbor stations communication disruption
Between two neighbor stations, communication disruption (as Fig. 3 situation c) comparatively loses synchronously even more serious a kind of situation, and now all pilot protections of corresponding line will lose efficacy, and is necessary that open higher level's III of Distance section provides emergency function far away.For this situation, B
2stand can by with the feature of no signal exchange in certain neighbor stations certain hour as communication disruption, and this signal is uploaded region main website B
0.
4) subordinate station cover protective device lost efficacy
Work as B
2standing, certain overlaps (as Fig. 3 situation d) when protective device lost efficacy, and for the protective device of dual, wherein a set of inefficacy can reduce protection reliability, and for only there being a set of protective device, inefficacy will mean this relay fail.Therefore when learning that protective device lost efficacy, can by higher level's III section of opening.
5) subordinate station partial information disappearance or full detail interrupt
This situation and feature 3) different, the communication failure of this situation mainly occurs in subordinate station own range (as Fig. 3 situation e).Partial information disappearance may be damage due to station communication network portion and cause, and at this moment in station, the protection of bus, transformer and this station outlet all can be affected, and should open higher level III section in support.Owing to being equipped with territory backup protection main frame in station in each station, territory main frame of standing is used for identification station internal fault by concentrating full station information, and therefore differentiation result by station territory Host Detection identification, and can be uploaded regional host computer by the feature of partial information disappearance.
2. grid faults characteristics module
Backup protection platform in region is utilized to gather grid faults characteristics to open the III of Distance section of higher level's element.
1) III segment protect installation place and subordinate station export certain protection and meet formula (1) and (2)
1 is protected, then as subordinate circuit L for Fig. 3
2k
1when point breaks down, owing to protecting distance between 1 and fault point, and by B
2to stand the impact of other branch roads, probably make criterion (1) and (2) tripping of protection 1, and then make the tripping of III of Distance section.
But on region backup protection platform, because regional host computer has possessed the ability of concentrated multi information, each outlet of subordinate station can be obtained and protect the fault signature reacted, namely protect the information at 2,3,5 places.Then work as K
1when point breaks down, owing to protecting 3 and K
1point is positioned at same circuit, and its criterion (1), (2) can sensitive action, and by the opening of III section, protection 1 place, realize its emergency function far away.And the judgement protecting 1 simultaneously to carry out criterion (1), (2), then contribute at circuit L
1by sensitive for III of Distance section opening during fault, assist and bear nearly emergency function.
2) subordinate station busbar voltage meets multiple press strip part
Protect 1 for Fig. 3, multiple press strip part is made up of jointly phase low-voltage, negative sequence voltage and residual voltage criterion, and wherein negative phase-sequence and the residual voltage theoretical value when circuit overload is zero, can not malfunction.And bus minimum voltage is not less than 80% of rated voltage when it has been generally acknowledged that overload, therefore lower voltage components is adjusted as 0.7U
nthere is reliability.B
2busbar voltage of standing meets condition of negative pressure.
3) a subordinate station outlet (comprising III section of place circuit) is in non-full-operating state
Protect 1 for Fig. 3, voltage levels circuit is often furnished with single-pole reclosing, and non-three phase circuit zero-sequence voltage injection meeting locking during single-pole reclosing, the sensitivity of adjacent lines zero sequence current differential protection can decline.If now B
2stand outlet L
2, L
3in certain circuit be in non-full-operating state, protect the opening of III section, 1 place.
The present invention is directed to the defect of current distance III section of faulty action preventing corrective measure Problems existing and the easy malfunction of traditional III of Distance section overload, propose the III of Distance section faulty action preventing system based on the two class fault signature in region and faulty action preventing method.This system is from the reality of electric power system; lay particular emphasis on perfect emergency function far away; utilize protection system fault signature and grid faults characteristics open distance III section in region; can realize before backup protection principle thoroughly reforms in electric power system; effective range of lift III section of faulty action preventing, anti-cascading trip ability; improve emergency function far away, ensure the safe and effective operation of transitional period system.The present invention can realize good faulty action preventing effect, effectively improves III of Distance section faulty action preventing, anti-cascading trip ability, perfect emergency function far away, ensures the safe and effective operation of transitional period system.
Claims (3)
1., based on the III of Distance section faulty action preventing system of the two class fault signature in region, it is characterized in that, this system comprises protection system fault signature module and grid faults characteristics module;
Described protection system fault signature module utilizes protection system fault signature to realize the opening of higher level's element III segment protect or locking, comprise to judge in subordinate station TV, TA whether broken string part, judge whether subordinate station and neighbor stations lose sync section, judge subordinate station and neighbor stations whether communication disruption part, judge subordinate station protective device whether disabling portion and judge whether partial information lacks or full detail interrupt unit subordinate station;
Describedly to judge in subordinate station whether TV, TA break part, when in system, certain station TV, TA break, often need distance, current protection that locking is relevant, for non-latching protection, also may cause relay fail because transformer disconnection measure error is large, therefore subordinate station transformer disconnection information be started feature as one;
Describedly judge whether subordinate station and neighbor stations lose sync section, be that current ultra-high-tension power transmission line generally joins current differential protection as main protection, when certain subordinate station loses synchronous with neighbor stations, the current differential of respective lines will be blocked; In addition, when between station, current differential synchronizing signal is provided by PMU device, or by " table tennis pair time method " between PMU device subsidiary discriminant station whether accurate synchronization, then also can using the fault message of PMU device or subsidiary discriminant result as losing synchronous characteristic signal except difference stream is out-of-limit;
Describedly judge subordinate station and neighbor stations whether communication disruption part, that between two neighbor stations, communication disruption comparatively loses synchronously even more serious a kind of situation, now all pilot protections of corresponding line will lose efficacy, and be necessary that open higher level's III of Distance section provides emergency function far away;
Describedly judging subordinate station protective device whether disabling portion, is that for the protective device of dual, wherein a set of inefficacy can reduce protection reliability, and for only there being a set of protective device, inefficacy will mean this relay fail when in standing during certain cover protective device inefficacy; Therefore when learning that protective device lost efficacy, can by higher level's III section of opening;
Describedly judge subordinate station whether partial information disappearance or full detail interrupt unit, that communication failure mainly occurs in subordinate station own range, partial information disappearance may be damage due to station communication network portion and cause, at this moment in station, the protection of bus, transformer and this station outlet all can be affected, and should open higher level III section in support; Owing to being equipped with territory backup protection main frame in station in each station, territory main frame of standing is used for identification station internal fault by concentrating full station information, and therefore differentiation result by station territory Host Detection identification, and can be uploaded regional host computer by the feature of partial information disappearance;
Described grid faults characteristics module utilizes grid faults characteristics to realize the opening of higher level's element III segment protect or locking, comprises and judges that III segment protect installation place and subordinate station export certain protection and whether meet operating criterion part, judge the whether satisfied pressure condition part again of subordinate station busbar voltage and judge whether certain outlet that subordinate station comprises III section of place circuit is in non-full-operating state part;
Describedly judge that III segment protect installation place and subordinate station export certain protection and whether meet operating criterion part, be that regional host computer possesses the ability of concentrated multi information on region backup protection platform, obtain each outlet of subordinate station and protect the fault signature reacted;
This above-mentioned III segment protect installation place and subordinate station outlet Protection criteria are:
I
2+I
0>0.5I
1(1)
In formula, I
1, I
2, I
0for protecting positive and negative, the zero-sequence current of installation place, U
1for positive sequence voltage,
for the angle of positive sequence voltage and forward-order current,
for line impedance angle; Formula (1), (2) are got or again with directional impedance relay phase with, then can start in unbalanced fault up-to-date style (1), symmetric fault up-to-date style (2) can start, and overload up-to-date style (1), (2) all do not start, thus play the effect preventing distance protection malfunction;
When certain a bit breaks down, the protection being positioned at same circuit with fault point meets criterion (1), (2), can sensitive action, and by the III section of opening of higher level's route protection, realizes its emergency function far away; And the judgement of criterion (1), (2) is carried out in higher level's protection simultaneously, then contribute to when higher level's line fault by sensitive for III of Distance section opening, assist and bear nearly emergency function;
Describedly judge that whether subordinate station busbar voltage meets and press condition part again, be that multiple press strip part is made up of jointly phase low-voltage, negative sequence voltage and residual voltage criterion, wherein negative phase-sequence and the residual voltage theoretical value when circuit overload is zero, can not malfunction; The multiple press strip part of bus is:
Press criterion sensitive action during element fault in subordinate station station again, higher level's III of Distance section is open, when standby far away being provided failure removal by III section during element protection tripping in standing;
Whether described certain outlet judging that subordinate station comprises III section of place circuit is in non-full-operating state part, that voltage levels circuit is often furnished with single-pole reclosing, non-three phase circuit zero-sequence voltage injection meeting locking during single-pole reclosing, the sensitivity of adjacent lines zero sequence current differential protection can decline, now there is not short trouble, but due to protection system hydraulic performance decline, also can by the opening of higher level III segment protect with reply contingent fault at any time; Except single-phase coincidence, circuit breaker jump also can cause open-phase operation, can by same state processing; Because open-phase operation belongs to disconnection fault, therefore booster action can be played as the one of grid faults characteristics;
The fault characteristic information that described protection system fault signature module and grid faults characteristics module utilize region main website to gather simultaneously, judges whether to meet protection system fault signature and grid faults characteristics respectively.
2. the III of Distance section faulty action preventing system based on the two class fault signature in region according to claim 1; it is characterized in that; TV, TA whether broken string part is judged in subordinate station in described protection system fault signature module; because TV, TA broken string has special identical criterion; in transformer station, namely original protective device comprises this function; locality protection main frame differentiates without the need to carrying out repeating, the differentiation result at fault station can be uploaded for.
3., based on the III of Distance section faulty action preventing method of the two class fault signature in region, it is characterized in that, the method step is:
Step 1: when lower system breaks down, higher level's protective device judges whether action according to III of Distance section operating criterion;
Step 2: what protection system fault signature module comprised judge in subordinate station TV, TA whether broken string part, judge whether subordinate station and neighbor stations lose sync section, judge subordinate station and neighbor stations whether communication disruption part, judge subordinate station protective device whether disabling portion and judge that the subordinate station fault characteristic information whether partial information lacks or full detail interrupt unit utilizes region main website to gather respectively judges protection system whether fault;
Simultaneously, judge that III segment protect installation place and subordinate station export certain protection and whether meet operating criterion part in grid faults characteristics module, judge that whether subordinate station busbar voltage meets and press condition part again, judge whether certain outlet that subordinate station comprises III section of place circuit is in non-full-operating state part and utilizes the fault characteristic information gathered in the main website of region to judge electrical network whether fault respectively;
Step 3: the output signal of protection system malfunctioning module and grid faults characteristics module is done or computing, sends the locking of III of Distance section or open logical signal;
Step 4: in the actuating signal of step 1 middle distance III segment protect and step 3, logical signal does and computing, judging distance III section whether deferred action.
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| CN104113048B (en) * | 2014-06-24 | 2017-11-10 | 中国石油化工股份有限公司 | A kind of power distribution network intelligent protection system |
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