CN103280776B - A kind of method preventing differential protection incorrect operation - Google Patents
A kind of method preventing differential protection incorrect operation Download PDFInfo
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- CN103280776B CN103280776B CN201310187740.6A CN201310187740A CN103280776B CN 103280776 B CN103280776 B CN 103280776B CN 201310187740 A CN201310187740 A CN 201310187740A CN 103280776 B CN103280776 B CN 103280776B
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Abstract
The invention discloses a kind of method preventing differential protection incorrect operation, first, differential protection verification SV receive soft pressing plate whether exit operation reasonable, be that the electric current by being transferred to differential protection verifies during practical operation; Secondly, when unloaded or load is very light, the mode of above-mentioned verification electric current can lose efficacy, and now, needs when load is increased to and can identifies, then by the mode verifying electric current judge SV receive soft pressing plate whether exit operation reasonable; Finally, when SV receive soft pressing plate be in exit status time, electric power system there occurs fault, and now, whether needing to verify SV by Fault Identification, to receive the state of soft pressing plate reasonable.Of the present invention a kind of prevent the method for differential protection incorrect operation from can effectively prevent SV from receiving soft pressing plate exit the generation causing differential protection incorrect operation situation by mistake, improve the fail safe that intelligent grid runs.
Description
Technical field
The present invention relates to a kind of method preventing differential protection incorrect operation, be specifically related to a kind of preventing in intelligent substation and, because SV receives the method that soft pressing plate exits the differential protection incorrect operation caused by mistake, belong to technical field of electricity.
Background technology
Along with scientific and technological progress; protective device input and output in intelligent substation there occurs change; the electric current of the protective device of conventional substation is Direct Sampling, and in intelligent substation, current sample is completed by merge cells, is transferred to differential protection by fiber optic data communication interface.A kind of structural representation of intelligent substation as shown in Figure 1.An interval comprises intelligent terminal, switchgear, instrument transformer, merge cells, and intelligent terminal is connected with switchgear, and the breaker tripping and closing signal of intelligent terminal for reception differential protection, switching devices controls.Merge cells connects instrument transformer, and the information transmission detected by instrument transformer is to differential protection.According to the protection range of differential protection, the merge cells in corresponding interval is connected to differential protection, and a differential protection can connect several intervals.
The conveniently operating maintenance of intelligent substation, is generally provided with a SV for the merge cells in each interval and receives soft pressing plate in differential protection.In addition, merge cells and differential protection are all provided with the hard pressing plate of maintenance, and the inspecting state of merge cells and differential protection is exported by communication message.
Under normal circumstances, the SV at interval receives soft pressing plate and is in input state.When maintenance is stopped transport at some intervals, need the SV exiting this interval to receive soft pressing plate, then hard for the maintenance of the merge cells in this interval pressing plate is dropped into.Here every SV receive after soft pressing plate exits, the current data at differential protection just not this interval of reprocessing.Therefore, as the one of soft pressing plate, the effect that SV receives soft pressing plate is, by dropping into operation normally, to make the current data at this interval of differential protection process, by exiting operation normally, makes the current data at differential protection not this interval of reprocessing.In the similar conventional substation differential protection of this process, current terminal seals interval CT electric current.
Type and the quantity of the soft pressing plate that the differential protection in intelligent substation is arranged are very many.Especially busbar differential protection device, it is connected to a lot of merge cellses especially, and the soft pressing plate being arranged on title on differential protection close is very many.Therefore, there is the possibility that soft pressing plate exits by mistake in practice.And SV of the present invention receive by mistake exiting of soft pressing plate can cause very serious impact to transforming plant protecting.Especially, when SV receives soft pressing plate participation current differential protection, SV receives by mistake exiting of soft pressing plate can cause differential protection generation incorrect operation, such as mistake action and rejecting action, and this will inevitably make a big impact to the normal operation of intelligent substation.According to the retrieval of technical staff, in world wide, do not have the approaches and methods of head it off.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of method preventing differential protection incorrect operation.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
Prevent a method for differential protection incorrect operation, it is characterized in that, comprising:
Step one: differential protection uninterruptedly judges that there is no current at all intervals;
Step 2: differential protection uninterruptedly judges that there is non-faulty current at all intervals;
Step 3: be in input state when a SV corresponding with the first interval receives soft pressing plate, and to a SV receive soft pressing plate exit operation time, differential protection proceeds as follows:
Step 3a: when being separated with electric current between first, differential protection sends prompting clamp operation unsuccessful alarm signal, not Blocking Differential Protection, and to keep a SV to receive soft pressing plate be input state;
Step 3b: when the first interval no current, a SV is received soft pressing plate and is placed in exit status by differential protection;
Step 4: be in exit status when a SV receives soft pressing plate, be separated with electric current between first, and the first interval is not when inspecting state, differential protection proceeds as follows:
Step 4a: differential protection sends the alarm signal that pressing plate state is checked in prompting;
Step 4b: when differential protection according to the electric current at interval judge a SV receive soft pressing plate should be in input state time, differential protection sends the alarm signal that by mistake exits of prompting pressing plate, and a SV is received soft pressing plate is placed in input state;
Step 5: be in exit status when a SV receives soft pressing plate, the first interval not at inspecting state, and meets a period of time that imposes a condition, and differential protection proceeds as follows:
Step 5a: when the wrong mark of the current data at the first interval, differential protection sends the alarm signal that pressing plate state is checked in prompting, and execution error mark Blocking Differential Protection logic;
Step 5b: when the current data inerrancy mark at the first interval, differential protection recalculates differential protection, obtains the first result of calculation m before the electric current at the first interval being traced back to fault generation
1with the second result of calculation m
2, the first result of calculation m
1be the differential protection result of calculation during electric current participation differential current calculating at the first interval, the second result of calculation m
2be the differential protection result of calculation that the electric current at the first interval does not participate in when differential current calculates; Differential protection is according to the first result of calculation m
1with the second result of calculation m
2carry out Logic judgment, and carry out correct action;
Described imposing a condition one is: the first interval is from non-faulty current to having fault current and through time delay t
3, t
3be greater than differential protection and recalculate time t
4.
A kind of aforesaid method preventing differential protection incorrect operation, it is characterized in that, described step one comprises: if the electric current of any phase in interval is greater than threshold electric current I
set1, retention time t
1, then differential protection is separated with electric current between judging; If the electric current of each phase in interval is all less than threshold electric current I
set2, then differential protection judges interval no current; Threshold electric current I
set2equal threshold electric current I
set1be multiplied by resetting ratio k
1, resetting ratio k
1be less than 1.
A kind of aforesaid method preventing differential protection incorrect operation, is characterized in that, threshold electric current I
set1equal load current value and be multiplied by proportionality coefficient p, 0<p≤0.02; Delay time t
1value is 20ms≤t
1≤ 200ms.
A kind of aforesaid method preventing differential protection incorrect operation, it is characterized in that, described step 2 comprises: if the electric current of any phase in interval is greater than threshold electric current I
set3, then differential protection is separated with fault current between judging; If the electric current of each phase in interval is all less than threshold electric current I
set4, then differential protection judges interval non-faulty current; Threshold electric current I
set4equal threshold electric current I
set3be multiplied by resetting ratio k
2, resetting ratio k
2be less than 1.
A kind of aforesaid method preventing differential protection incorrect operation, is characterized in that, threshold electric current I
set3equal differential action current ration and be multiplied by safety factor q, 0<q<1.
A kind of aforesaid method preventing differential protection incorrect operation, it is characterized in that, described step 4b comprises: work as I
cl1-I
cl2>k
3× I
cl, through delay time t
2, differential protection judges that a SV receives soft pressing plate and should be in input state, I
cl1be the difference stream effective value that the electric current at the first interval is not counted in differential circuit, I
cl2be the difference stream effective value that the electric current at the first interval counts differential circuit, k
3for proportionality coefficient, I
clit is the current effective value at the first interval; 0.3<k
3<0.9,20ms≤t
2≤ 200ms.
A kind of aforesaid method preventing differential protection incorrect operation, is characterized in that, 40ms≤t
3≤ 70ms, 30ms≤t
4≤ 60ms.
A kind of aforesaid method preventing differential protection incorrect operation, it is characterized in that, described step 5b comprises:
Step 5b1: if according to the first result of calculation m
1time differential action, and according to the second result of calculation m
2time differential also action, then differential protection action, sends prompting and checks the warning signal of pressing plate state;
Step 5b2: if according to the first result of calculation m
1the time difference is done easily, and according to the second result of calculation m
2in time, is differentially also failure to actuate, then differential protection is failure to actuate, and sends the warning signal that pressing plate state is checked in prompting;
Step 5b3: if according to the first result of calculation m
1time differential action, and according to the second result of calculation m
2the time difference is done easily, then differential protection is failure to actuate, and jumps the switch at the first interval, and sends the warning signal that pressing plate state is checked in prompting;
Step 5b4: if according to the first result of calculation m
1the time difference is done easily, and according to the second result of calculation m
2time differential action, then differential protection is failure to actuate, and a SV is received soft pressing plate and is placed in input state, sends the alarm signal that by mistake exits of prompting pressing plate.
Usefulness of the present invention is: of the present invention a kind of prevent the method for differential protection incorrect operation from can effectively prevent SV from receiving soft pressing plate exit the generation causing differential protection incorrect operation situation by mistake, improve the fail safe that intelligent grid runs.
Accompanying drawing explanation
Fig. 1 is a preferred structure schematic diagram of intelligent substation of the present invention;
Fig. 2 is that the present invention judges that there is currentless first preferred logic schematic diagram at interval;
Fig. 3 is that the present invention judges that there is currentless second preferred logic schematic diagram at interval;
Fig. 4 is that the present invention judges that there is first preferred logic schematic diagram of non-faulty current at interval;
Fig. 5 is that the present invention judges that there is second preferred logic schematic diagram of non-faulty current at interval;
Fig. 6 is preferred logic schematic diagram corresponding to step 3 of the present invention;
Fig. 7 is preferred logic schematic diagram corresponding to step 4 of the present invention;
Fig. 8 is preferred logic schematic diagram corresponding to step 5 of the present invention;
Fig. 9 is the preferred logic schematic diagram that step 5b of the present invention is corresponding.
The implication of Reference numeral in figure:
1, differential protection, 2, merge cells, 3, intelligent terminal, 4, instrument transformer, 5, switchgear, 6, interval.
Embodiment
Below in conjunction with the drawings and specific embodiments, concrete introduction is done to the present invention.
What the present invention relates to is a kind of preventing in intelligent substation because SV receives the method that soft pressing plate exits the differential protection incorrect operation caused by mistake.The present invention carries out from following level: first, differential protection 1 need to verify SV receive soft pressing plate whether exit operation reasonable, be that the electric current being transferred to differential protection 1 by merge cells verifies during practical operation; Secondly, when unloaded or load is very light, the mode of above-mentioned verification electric current can lose efficacy, and now, needs when load is increased to and can identifies, then by the mode verifying electric current judge SV receive soft pressing plate whether exit operation reasonable; Finally, also likely there is a kind of situation, namely when SV receive soft pressing plate be in exit status time, electric power system there occurs fault, and now, whether needing to verify SV by Fault Identification, to receive the state of soft pressing plate reasonable.By above-mentioned three aspects, prevent differential protection 1 incorrect operation the most perfectly.
The intelligent substation that the present invention is based on as shown in Figure 1 carries out.Intelligent terminal 3 is connected with switchgear 5, intelligent terminal 3 switching devices 5 controls.Merge cells 2 connects instrument transformer 4, and by the information that instrument transformer 4 detects, such as the current information at interval 6 is transferred to differential protection 1.Differential protection 1 pair of intelligent terminal 3 carries out action, excision fault point.In reality, in the present invention, the concrete title of merge cells 2, intelligent terminal 3 may change to some extent, but as long as meet the function of merge cells 2 of the present invention, intelligent terminal 3, is namely suitable for the present invention.
As the preferred embodiments of the present invention, with reference to shown in Fig. 2 to Fig. 8, a kind of method preventing differential protection incorrect operation of the present invention, comprises following five steps:
Step one: differential protection uninterruptedly judges that there is no current at all intervals 6.The present invention does not limit and judges that there are currentless concrete steps at interval 6, but as preferably, as shown in Figure 2 and Figure 3, if the electric current of any phase in interval 6 is greater than threshold electric current I
set1, retention time t
1, then differential protection judges that there is electric current at interval 6; If the electric current of each phase in interval 6 is all less than threshold electric current I
set2, then differential protection judges interval 6 no current; Threshold electric current I
set2equal threshold electric current I
set1be multiplied by resetting ratio k
1, resetting ratio k
1be less than 1., the threshold electric current I of setting
set1can be very low; the not requirement of demand fulfillment protective device precise work current; just determine whether the state of electric current; the generally rated current of desirable less than 2%; be mainly the impact escaping noise, if the precision of sampling is enough high, can close to zero on setting Threshold Theory; setting threshold is more low is more conducive to preventing the interval pressing plate in underloading situation from exiting by mistake, and object is difficult to enter at the very start and exits pressing plate state by mistake.Further, as preferably, threshold electric current I
set1equal load current value and be multiplied by proportionality coefficient p, 0<p≤0.02; Time delay t
1value is 20ms≤t
1≤ 200ms.
Step 2: differential protection uninterruptedly judges that there is non-faulty current at all intervals 6.The present invention does not limit and judges that there are currentless concrete steps at interval 6, but as preferred, as shown in Figure 4, Figure 5, step 2 comprises: if the electric current of any phase in interval 6 is greater than threshold electric current I
set3, then differential protection judges that there is fault current at interval 6; If the electric current of each phase in interval 6 is all less than threshold electric current I
set4, then differential protection judges interval 6 non-faulty current; Threshold electric current I
set4equal threshold electric current I
set3be multiplied by resetting ratio k
2, resetting ratio k
2be less than 1.Here, the judgement of fault current can adopt sampled value algorithm, to improve reliability and the rapidity of fault current judgement, judges that data window is less than the fastest data window of differential action.Further, as preferably, threshold electric current I
set3equal differential action current ration and be multiplied by safety factor q, 0<q<1.
Step 3: be in input state when a SV corresponding with the first interval receives soft pressing plate, and to a SV receive soft pressing plate exit operation time, as shown in Figure 6, differential protection proceeds as follows: step 3a: when being separated with electric current between first, differential protection sends the unsuccessful alarm signal of prompting clamp operation, not Blocking Differential Protection, and to keep a SV to receive soft pressing plate be input state; Step 3b: when the first interval no current, a SV is received soft pressing plate and is placed in exit status by differential protection.
In the present invention, any one interval that the first interval refers to and differential protection is connected, the first interval is within the scope of differential protection.In the present invention, a SV receives soft pressing plate and refers to that the SV corresponding with the first interval receives soft pressing plate, and it is arranged on differential protection.Judge that the first interval has currentless foundation to be step one.Further, be increase the reliability judged, if phase-splitting is differential, the judged result of all phases again by or, and, 3 get any one Logic judgment in the logics such as 2 and finally export again.
Step 4: be in exit status when a SV receives soft pressing plate, be separated with electric current between first, and the first interval is not when inspecting state, as shown in Figure 7, differential protection proceeds as follows:
Step 4a: differential protection sends the alarm signal that pressing plate state is checked in prompting;
Step 4b: when differential protection according to the electric current at interval judge a SV receive soft pressing plate should be in input state time, differential protection sends the alarm signal that by mistake exits of prompting pressing plate, and a SV is received soft pressing plate is placed in input state.The present invention does not limit differential protection and sentences a SV according to the electric current at interval and receive the concrete mode that soft pressing plate should be in input state, but as preferably, can according to carrying out as follows: work as I
cl1-I
cl2>k
3× I
cl, through delay time t
2, differential protection judges that a SV receives soft pressing plate and should be in input state, I
cl1be the difference stream effective value being not counted in differential circuit in the electric current at the first interval, I
cl2be the difference stream effective value counting differential circuit in the electric current at the first interval, k
3for proportionality coefficient, I
clit is the effective value of the electric current at the first interval; 0.3<k
3<0.9,20ms≤t
2≤ 200ms.Here, spacing current is gathered by merge cells and is transferred to differential protection, I
cl1, I
cl2, I
clconcrete account form can carry out according to the technical approach that differential protection is general, the present invention is not limited.
Step 5: be in exit status when a SV receives soft pressing plate, the first interval not at inspecting state, and meets a period of time that imposes a condition, and as shown in Figure 8, differential protection proceeds as follows:
Step 5a: when the wrong mark of the current data at the first interval, differential protection sends the alarm signal that pressing plate state is checked in prompting, and execution error mark Blocking Differential Protection logic;
Step 5b: when the current data inerrancy mark at the first interval, differential protection recalculates differential protection, obtains the first result of calculation m before the electric current at the first interval being traced back to fault generation
1with the second result of calculation m
2, the first result of calculation m
1be the differential protection result of calculation during electric current participation differential current calculating at the first interval, the second result of calculation m
2be the differential protection result of calculation that the electric current at the first interval does not participate in when differential current calculates; Differential protection is according to the first result of calculation m
1with the second result of calculation m
2carry out Logic judgment, and carry out correct action;
The present invention imposes a condition and one is: the first interval is from non-faulty current to having fault current and retention time t
3, time t
3be greater than differential protection and recalculate time t
4.
Here, differential protection judges that whether the first interval is that the inspecting state of merge cells and differential protection is exported by communication message because be all provided with the hard pressing plate of maintenance on merge cells and differential protection at inspecting state.Differential protection just obtains inspecting state from this communication message.
The error flag of the current data at the first interval is also be transferred to differential protection by similar communication message; the present invention does not limit its embodiment; those skilled in the art can commonly use set-up mode according to this area and carry out; such as, it can be transferred to differential protection by merge cells.T in condition 1
3be greater than differential protection and recalculate time t
4, its reason is to recalculate to differential protection to stay time enough.The present invention does not limit the concrete time, but as preferred, 40ms≤t
3≤ 70ms, 30ms≤t
4≤ 60ms.
In step 5a, error flag Blocking Differential Protection logic is the logic that differential protection carries out differential protection, can carry out with reference to the protection setting of General differential protective device.
The first result of calculation m
1, the second result of calculation m
2be the account form that this area differential protection is conventional, the present invention does not limit further.Differential protection is according to the first result of calculation m
1with the second result of calculation m
2carry out Logic judgment, and carry out correct action.
The present invention does not limit the specific implementation of step 5b, and as preferably, as shown in Figure 9, step 5b comprises:
Step 5b1: if according to the first result of calculation m
1time differential action, and according to the second result of calculation m
2time differential also action, then differential protection action, sends prompting and checks the warning signal of pressing plate state;
Step 5b2: if according to the first result of calculation m
1the time difference is done easily, and according to the second result of calculation m
2in time, is differentially also failure to actuate, then differential protection is failure to actuate, and sends the warning signal that pressing plate state is checked in prompting;
Step 5b3: if according to the first result of calculation m
1time differential action, and according to the second result of calculation m
2the time difference is done easily, then differential protection is failure to actuate, and jumps the switch at the first interval, and sends the warning signal that pressing plate state is checked in prompting;
Step 5b4: if according to the first result of calculation m
1the time difference is done easily, and according to the second result of calculation m
2time differential action, then differential protection is failure to actuate, and a SV is received soft pressing plate and is placed in input state, sends the alarm signal that by mistake exits of prompting pressing plate.
Further, if to be phase-splitting differential for differential protection, then the judged result of each phase again through or, with, 3 get any one Logic judgment in the logics such as 2 and finally export again, this effect is mainly for increasing the reliability of judgement.
Of the present invention a kind of prevent the method for differential protection incorrect operation from can effectively prevent SV from receiving soft pressing plate exit the generation causing differential protection incorrect operation situation by mistake, improve the fail safe that intelligent grid runs.
More than show and describe general principle of the present invention, principal character and advantage.The technical staff of the industry should understand, and above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (8)
1. prevent a method for differential protection incorrect operation, it is characterized in that, comprising:
Step one: differential protection uninterruptedly judges that there is no current at all intervals;
Step 2: differential protection uninterruptedly judges that there is non-faulty current at all intervals;
Step 3: be in input state when a SV corresponding with the first interval receives soft pressing plate, and to a SV receive soft pressing plate exit operation time, differential protection proceeds as follows:
Step 3a: when being separated with electric current between first, differential protection sends prompting clamp operation unsuccessful alarm signal, not Blocking Differential Protection, and to keep a SV to receive soft pressing plate be input state;
Step 3b: when the first interval no current, a SV is received soft pressing plate and is placed in exit status by differential protection;
Step 4: be in exit status when a SV receives soft pressing plate, be separated with electric current between first, and the first interval is not when inspecting state, differential protection proceeds as follows:
Step 4a: differential protection sends the alarm signal that pressing plate state is checked in prompting;
Step 4b: when differential protection according to the electric current at interval judge a SV receive soft pressing plate should be in input state time, differential protection sends the alarm signal that by mistake exits of prompting pressing plate, and a SV is received soft pressing plate is placed in input state;
Step 5: be in exit status when a SV receives soft pressing plate, the first interval not at inspecting state, and meets a period of time that imposes a condition, and differential protection proceeds as follows:
Step 5a: when the wrong mark of the current data at the first interval, differential protection sends the alarm signal that pressing plate state is checked in prompting, and execution error mark Blocking Differential Protection logic;
Step 5b: when the current data inerrancy mark at the first interval, differential protection recalculates differential protection, obtains the first result of calculation m before the electric current at the first interval being traced back to fault generation
1with the second result of calculation m
2, the first result of calculation m
1be the differential protection result of calculation during electric current participation differential current calculating at the first interval, the second result of calculation m
2be the differential protection result of calculation that the electric current at the first interval does not participate in when differential current calculates; Differential protection is according to the first result of calculation m
1with the second result of calculation m
2carry out Logic judgment, and carry out correct action;
Described imposing a condition one is: the first interval is from non-faulty current to having fault current and retention time t
3, time t
3be greater than differential protection and recalculate time t
4.
2. a kind of method preventing differential protection incorrect operation according to claim 1, it is characterized in that, described step one comprises: if the electric current of any phase in interval is greater than threshold electric current I
set1, retention time t
1, then differential protection is separated with electric current between judging; If the electric current of each phase in interval is all less than threshold electric current I
set2, then differential protection judges interval no current; Threshold electric current I
set2equal threshold electric current I
set1be multiplied by resetting ratio k
1, resetting ratio k
1be less than 1.
3. a kind of method preventing differential protection incorrect operation according to claim 2, is characterized in that, threshold electric current I
set1equal load current value and be multiplied by proportionality coefficient p, 0<p≤0.02; Delay time t
1value is 20ms≤t
1≤ 200ms.
4. a kind of method preventing differential protection incorrect operation according to claim 1, it is characterized in that, described step 2 comprises: if the electric current of any phase in interval is greater than threshold electric current I
set3, then differential protection is separated with fault current between judging; If the electric current of each phase in interval is all less than threshold electric current I
set4, then differential protection judges interval non-faulty current; Threshold electric current I
set4equal threshold electric current I
set3be multiplied by resetting ratio k
2, resetting ratio k
2be less than 1.
5. a kind of method preventing differential protection incorrect operation according to claim 4, is characterized in that, threshold electric current I
set3equal differential action current ration and be multiplied by safety factor q, 0<q<1.
6. a kind of method preventing differential protection incorrect operation according to claim 1, it is characterized in that, described step 4b comprises: work as I
cl1-I
cl2>k
3× I
cl, through delay time t
2, differential protection judges that a SV receives soft pressing plate and should be in input state, I
cl1be the difference stream effective value being not counted in differential circuit in the electric current at the first interval, I
cl2be the difference stream effective value counting differential circuit in the electric current at the first interval, k
3for proportionality coefficient, I
clit is the effective value of the electric current at the first interval; 0.3<k
3<0.9,20ms≤t
2≤ 200ms.
7. a kind of method preventing differential protection incorrect operation according to claim 1, is characterized in that, 40ms≤t
3≤ 70ms, 30ms≤t
4≤ 60ms.
8. a kind of method preventing differential protection incorrect operation according to claim 1, it is characterized in that, described step 5b comprises:
Step 5b1: if according to the first result of calculation m
1time differential action, and according to the second result of calculation m
2time differential also action, then differential protection action, sends prompting and checks the warning signal of pressing plate state;
Step 5b2: if according to the first result of calculation m
1the time difference is done easily, and according to the second result of calculation m
2in time, is differentially also failure to actuate, then differential protection is failure to actuate, and sends the warning signal that pressing plate state is checked in prompting;
Step 5b3: if according to the first result of calculation m
1time differential action, and according to the second result of calculation m
2the time difference is done easily, then differential protection is failure to actuate, and jumps the switch at the first interval, and sends the warning signal that pressing plate state is checked in prompting;
Step 5b4: if according to the first result of calculation m
1the time difference is done easily, and according to the second result of calculation m
2time differential action, then differential protection is failure to actuate, and a SV is received soft pressing plate and is placed in input state, sends the alarm signal that by mistake exits of prompting pressing plate.
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| CN103701207A (en) * | 2013-11-19 | 2014-04-02 | 许继集团有限公司 | Method for preventing misoperation of SV soft strap with current gap |
| CN103746351B (en) * | 2013-11-26 | 2016-05-25 | 清华大学 | Power system fault alarm method considering digital substation secondary circuit signal |
| CN104483857B (en) * | 2014-11-13 | 2017-04-26 | 国家电网公司 | Optical digital sampling value relaying protection device-based sampling value display method and system |
| CN104734118B (en) * | 2015-03-16 | 2017-11-28 | 国网山西省电力公司电力科学研究院 | Intelligent substation transformer differential protection throws the Direct Recognition system for state of moving back |
| CN105186698A (en) * | 2015-10-31 | 2015-12-23 | 南京南瑞继保电气有限公司 | Method for improving reliability of operational overhaul of transformer substation |
| CN106787171B (en) * | 2016-11-28 | 2019-06-11 | 国网江苏省电力有限公司检修分公司 | A method of prevent interval SV soft pressing plate miscarrying from moving back |
| CN111641183A (en) * | 2020-04-17 | 2020-09-08 | 许继集团有限公司 | Interval analog quantity on-site module multi-channel SV cascade control method |
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| JP3556044B2 (en) * | 1996-04-24 | 2004-08-18 | 東京電力株式会社 | Current differential relay |
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| CN1233099A (en) * | 1998-04-21 | 1999-10-27 | 东芝株式会社 | System protection relay device |
| CN102064609A (en) * | 2010-12-31 | 2011-05-18 | 南京中德保护控制***有限公司 | 500kV unmanned transformer station-based remote control method for protective soft pressing plate |
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