CN103280776A - Method for preventing incorrect operation of differential protection device - Google Patents
Method for preventing incorrect operation of differential protection device Download PDFInfo
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- CN103280776A CN103280776A CN2013101877406A CN201310187740A CN103280776A CN 103280776 A CN103280776 A CN 103280776A CN 2013101877406 A CN2013101877406 A CN 2013101877406A CN 201310187740 A CN201310187740 A CN 201310187740A CN 103280776 A CN103280776 A CN 103280776A
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Abstract
The invention discloses a method for preventing incorrect operation of a differential protection device. Firstly, the differential protection device verifies whether the withdrawal operation of an SV (Sampled Value) receiving soft pressing plate is rational or not; the verification is performed through the current transmitted to the differential protection device during actual operation; secondly, under the condition of no load or extremely light load, the current verification mode becomes invalid, and at the moment, whether the withdrawal operation of the SV receiving soft pressing plate is rational or not is judged by using the current verification mode again when the load is required to be increased to be recognizable; and finally, when the SV receiving soft pressing plate is in the withdrawal state, the power system fails, and at the moment, the condition whether the state of the SV receiving soft pressing plate is rational or not is required to be verified through failure recognition. According to the method for preventing the incorrect operation of the differential protection device, the situation of incorrect operation of differential protection caused by wrong withdrawal of the SV receiving soft pressing plate can be effectively prevented, and the safety of the operation of the intelligent power grid is improved.
Description
Technical field
The present invention relates to a kind of method that prevents the differential protection incorrect operation, be specifically related to a kind of in intelligent substation, preventing and belong to technical field of electricity because SV receives the method that soft pressing plate mistake withdraws from the differential protection incorrect operation that causes.
Background technology
Along with scientific and technological progress; variation has taken place in the protective device input and output in the intelligent substation; the electric current of the protective device of conventional substation is Direct Sampling, and current sample is finished by merge cells in the intelligent substation, is transferred to differential protection by the optical fiber communication interface.Be a kind of structural representation of intelligent substation as shown in Figure 1.An interval comprises intelligent terminal, switchgear, instrument transformer, merge cells, is connected with switchgear on the intelligent terminal, and intelligent terminal receives the breaker tripping and closing signal of differential protection, and switching devices is controlled.Merge cells connects instrument transformer, and the detected information of instrument transformer is transferred to differential protection.According to the protection range of differential protection, the merge cells on the corresponding interval is connected to differential protection, can connect several on the differential protection at interval.
The operating maintenance of intelligent substation generally all is provided with a SV at the merge cells in each interval and receives soft pressing plate in differential protection for convenience.In addition, all be provided with the hard pressing plate of maintenance on merge cells and differential protection, the inspecting state of merge cells and differential protection is exported by communication message.
Under the normal condition, SV at interval receives soft pressing plate and is in the input state.When maintenance is stopped transport at some intervals, need withdraw from this SV at interval and receive soft pressing plate, then the hard pressing plate of maintenance of the merge cells in this interval is dropped into.After every SV received soft pressing plate and withdraws from during this time, differential protection was just no longer handled the current data at this interval.Therefore, a kind of as soft pressing plate, the effect that SV receives soft pressing plate is to make differential protection handle the current data at this interval by normal input operation, by withdrawing from operation normally, makes differential protection no longer handle the current data at this interval.Envelope interval CT electric current on the current terminal in the similar conventional substation differential protection of this process.
The type of the soft pressing plate that arranges on the differential protection in the intelligent substation and quantity are very many.Especially bus differential protecting device, it has connected a lot of merge cellses especially, and it is very many to be arranged on the close soft pressing plate of title on the differential protection.Therefore, the possibility that exists soft pressing plate mistake to withdraw from practice.And SV of the present invention receives the mistake of soft pressing plate and withdraws from can be to transforming plant protecting cause very and seriously influence.Especially when SV receives soft pressing plate and participates in current differential protection, the mistake that SV receives soft pressing plate withdraws from and can cause differential protection generation incorrect operation, and such as malfunction and tripping, this will inevitably make a big impact to the normal operation of intelligent substation.According to technical staff's retrieval, do not have the approaches and methods of head it off in the world wide.
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 that prevents the differential protection incorrect operation.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
A kind of method that prevents the differential protection incorrect operation is characterized in that, comprising:
Step 1: differential protection judges that uninterruptedly all have no current at interval;
Step 2: differential protection judges that uninterruptedly all have or not fault current at interval;
Step 3: when with first at interval a corresponding SV receive soft pressing plate and be in the input state, and a SV received soft pressing plate withdraw from when operating, differential protection carries out following operation:
Step 3a: when being separated with electric current for first, differential protection sends prompting clamp operation unsuccessful alarm signal, Blocking Differential Protection not, and to keep a SV to receive soft pressing plate be the input state;
Step 3b: when first at interval during no current, differential protection receives soft pressing plate with a SV and places exit status;
Step 4: be in exit status when a SV receives soft pressing plate, first is separated with electric current, and first at interval when inspecting state, and differential protection carries out following operation:
Step 4a: differential protection sends the alarm signal that the pressing plate state is checked in prompting;
Step 4b: when differential protective device was judged a SV and received soft pressing plate and should be in the input state according to electric current at interval, differential protection sent the alarm signal that prompting pressing plate mistake withdraws from, and a SV is received soft pressing plate placed the input state;
Step 5: be in exit status when a SV receives soft pressing plate, first at interval at inspecting state, and satisfies a period of time that imposes a condition, and differential protection carries out following operation:
Step 5a: when first at interval the wrong sign of current data, differential protection sends the alarm signal that the pressing plate state is checked in prompting, and the Blocking Differential Protection logic is marked in execution error;
Step 5b: when first at interval the current data inerrancy sign, differential protection is traced back to first at interval the electric current before fault takes place, and recomputates differential protection, obtains first kind of result of calculation m
1With second kind of result of calculation m
2, first kind of result of calculation m
1Be the differential protection result of calculation of first at interval the electric current when participating in differential current and calculating, second kind of result of calculation m
2Be the differential protection result of calculation of first at interval the electric current when not participating in differential current and calculating; Differential protection is according to first kind of result of calculation m
1With second kind of result of calculation m
2Carry out logic and judge, and carry out correct action;
Described imposing a condition one is: first at interval from the fault-free electric current to fault current being arranged and through time-delay t
3, t
3Recomputate time t greater than differential protection
4
Aforesaid a kind of method that prevents the differential protection incorrect operation is characterized in that described step 1 comprises: if the electric current of any phase is greater than the threshold electric current I at interval
Set1, retention time t
1, then differential protection is separated with electric current between judging; If the electric current of each phase is all less than the threshold electric current I at interval
Set2, then differential protection is judged no current at interval; The threshold electric current I
Set2Equal the threshold electric current I
Set1Multiply by resetting ratio k
1, resetting ratio k
1Less than 1.
Aforesaid a kind of method that prevents the differential protection incorrect operation is characterized in that the threshold electric current I
Set1Equal load current value and multiply by proportionality coefficient p, 0＜p≤0.02; Time-delay t
1Value is 20ms≤t
1≤ 200ms.
Aforesaid a kind of method that prevents the differential protection incorrect operation is characterized in that described step 2 comprises: if the electric current of any phase is greater than the threshold electric current I at interval
Set3, then differential protection is separated with fault current between judging; If the electric current of each phase is all less than the threshold electric current I at interval
Set4, then differential protection is judged fault-free electric current at interval; The threshold electric current I
Set4Equal the threshold electric current I
Set3Multiply by resetting ratio k
2, resetting ratio k
2Less than 1.
Aforesaid a kind of method that prevents the differential protection incorrect operation is characterized in that the threshold electric current I
Set3Equal differential operating current definite value and multiply by safety factor q, 0＜q＜1.
Aforesaid a kind of method that prevents the differential protection incorrect operation 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 is judged a SV and is received soft pressing plate and should be in input state, I
Cl1Be the difference stream effective value that first at interval the electric current is not counted in differential circuit, I
Cl2Be the difference stream effective value that first at interval the electric current counts differential circuit, k
3Be proportionality coefficient, I
ClIt is the current effective value at first interval; 0.3＜k
3＜0.9,20ms≤t
2≤ 200ms.
Aforesaid a kind of method that prevents the differential protection incorrect operation is characterized in that 40ms≤t
3≤ 70ms, 30ms≤t
4≤ 60ms.
Aforesaid a kind of method that prevents the differential protection incorrect operation is characterized in that described step 5b comprises:
Step 5b1: if according to first kind of result of calculation m
1The time differential action, and according to second kind of result of calculation m
2The time differential also action, the warning signal that the pressing plate state is checked in prompting is sent in then differential protection action;
Step 5b2: if according to first kind of result of calculation m
1The time difference is done easily, and according to second kind of result of calculation m
2In time, differentially also be failure to actuate, and then differential protection is failure to actuate, and sends the warning signal that the pressing plate state is checked in prompting;
Step 5b3: if according to first kind of result of calculation m
1The time differential action, and according to second kind of result of calculation m
2The time difference is done easily, and then differential protection is failure to actuate, and jumps the switch at first interval, and sends the warning signal that the pressing plate state is checked in prompting;
Step 5b4: if according to first kind of result of calculation m
1The time difference is done easily, and according to second kind of result of calculation m
2The time differential action, then differential protection is failure to actuate, and a SV is received soft pressing plate place the input state, sends the alarm signal that prompting pressing plate mistake withdraws from.
Usefulness of the present invention is: a kind of method that prevents the differential protection incorrect operation of the present invention can prevent effectively that the mistake that SV receives soft pressing plate from withdrawing from the generation that causes differential protection incorrect operation situation, improved the fail safe of intelligent grid operation.
Description of drawings
Fig. 1 is a preferred structure schematic diagram of intelligent substation of the present invention;
Fig. 2 is that the present invention judges that currentless first preferred logic schematic diagram is arranged at interval;
Fig. 3 is that the present invention judges that currentless second preferred logic schematic diagram arranged at interval;
Fig. 4 is that the present invention judges first preferred logic schematic diagram that has or not fault current at interval;
Fig. 5 is that the present invention judges second the preferred logic schematic diagram that has or not fault current at interval;
Fig. 6 is the preferred logic schematic diagram of step 3 correspondence of the present invention;
Fig. 7 is the preferred logic schematic diagram of step 4 correspondence of the present invention;
Fig. 8 is the preferred logic schematic diagram of step 5 correspondence of the present invention;
Fig. 9 is the preferred logic schematic diagram of step 5b correspondence of the present invention.
The implication of Reference numeral among the figure:
1, differential protection, 2, merge cells, 3, intelligent terminal, 4, instrument transformer, 5, switchgear, 6, at interval.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done concrete introduction.
What the present invention relates to is that a kind of preventing in intelligent substation receives the method that soft pressing plate mistake withdraws from the differential protection incorrect operation that causes because of SV.The present invention carries out from following level: at first, differential protection 1 need verification SV receive soft pressing plate whether withdraw from operation reasonable, during practical operation be to carry out verification by the electric current that merge cells is transferred to differential protection 1; Secondly, under unloaded or situation that load is very light, the mode of above-mentioned verification electric current can lose efficacy, at this moment, need load be increased to can identify in, again by the mode of verification electric current judge SV receive soft pressing plate whether withdraw from operation reasonable; At last, also a kind of situation might occur, namely when SV received soft pressing plate and is in exit status, fault had taken place in electric power system, and whether at this moment, it is reasonable to come verification SV to receive the state of soft pressing plate by Fault Identification.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.Be connected with switchgear 5 on the intelligent terminal 3, intelligent terminal 3 switching devices 5 are controlled.Merge cells 2 connects instrument transformers 4, with instrument transformer 4 detected information, is transferred to differential protection 1 such as 6 current information at interval.1 pair of intelligent terminal 3 of differential protection moves, the excision fault point.In the reality, the concrete title of merge cells 2, intelligent terminal 3 may change to some extent among the present invention, as long as still meet the function of merge cells 2 of the present invention, intelligent terminal 3, namely is suitable for the present invention.
As the preferred embodiments of the present invention, to shown in Figure 8, a kind of method that prevents the differential protection incorrect operation of the present invention comprises following five steps with reference to Fig. 2:
Step 1: differential protection judges that uninterruptedly 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 preferred, as Fig. 2, shown in Figure 3, if the electric current of 6 any phases is greater than the threshold electric current I at interval
Set1, retention time t
1, then differential protection judges that there is electric current at interval 6; If the electric current of 6 each phase is all less than the threshold electric current I at interval
Set2, then differential protection is judged 6 no currents at interval; The threshold electric current I
Set2Equal the threshold electric current I
Set1Multiply by resetting ratio k
1, resetting ratio k
1Less than 1., the threshold electric current I of setting
Set1Can be very low; do not need to satisfy the requirement of protective device Seiko electric current; just judge currentless state is arranged; general desirable rated current below 2%; be mainly and escape The noise, if the precision of sampling is enough high, sets threshold and can approach zero in theory; the setting threshold is more low to be conducive to more prevent that the interval pressing plate mistake under the underloading situation from withdrawing from, and purpose is difficult to enter the pressing plate state that by mistake withdraws from the very start.Further, as preferably, the threshold electric current I
Set1Equal load current value and multiply by proportionality coefficient p, 0＜p≤0.02; Time-delay t
1Value is 20ms≤t
1≤ 200ms.
Step 2: differential protection judges that uninterruptedly all intervals 6 have or not fault current.The present invention does not limit and judges that there are currentless concrete steps at interval 6, but as preferred, as Fig. 4, shown in Figure 5, step 2 comprises: if the electric current of 6 any phases is greater than the threshold electric current I at interval
Set3, then differential protection judges that there is fault current at interval 6; If the electric current of 6 each phase is all less than the threshold electric current I at interval
Set4, then differential protection is judged 6 fault-free electric currents at interval; The threshold electric current I
Set4Equal the threshold electric current I
Set3Multiply by resetting ratio k
2, resetting ratio k
2Less than 1.Here, the judgement of fault current can be adopted the sampled value algorithm, and to improve reliability and the rapidity that fault current is judged, the judgment data window is less than differential fastest data window.Further, as preferably, the threshold electric current I
Set3Equal differential operating current definite value and multiply by safety factor q, 0＜q＜1.
Step 3: be in the input state when a SV corresponding with first interval receives soft pressing plate, and a SV is received soft pressing plate withdraw from when operation, as shown in Figure 6, differential protection carries out following operation: step 3a: when being separated with electric current for first, differential protection sends the unsuccessful alarm signal of prompting clamp operation, Blocking Differential Protection not, and to keep a SV to receive soft pressing plate be the input state; Step 3b: when first at interval during no current, differential protection receives soft pressing plate with a SV and places exit status.
Among the present invention, first any one that refers at interval to be connected with differential protection at interval, first interval is in the differential protection scope.Among the present invention, a SV receives soft pressing plate and refers to that the SV corresponding with first interval receives soft pressing plate, and it is arranged on the differential protection.Judge that first has currentless foundation to be step 1 at interval.Further, for the reliability of increase judging, if phase-splitting is differential, the judged result of all phases again by or, with, 3 get in the logics such as 2 any logic and judge again and finally export.
Step 4: be in exit status when a SV receives soft pressing plate, first is separated with electric current, and first at interval when inspecting state, and as shown in Figure 7, differential protection carries out following operation:
Step 4a: differential protection sends the alarm signal that the pressing plate state is checked in prompting;
Step 4b: when differential protective device was judged a SV and received soft pressing plate and should be in the input state according to electric current at interval, differential protection sent the alarm signal that prompting pressing plate mistake withdraws from, and a SV is received soft pressing plate placed the input state.The present invention does not limit differential protection and declares a SV according to electric current at interval and receive the concrete mode that soft pressing plate should be in the input state, but as preferred, can carry out according to following: work as I
Cl1-I
Cl2＞k
3* I
C1, through delay time t
2, differential protection is judged a SV and is received soft pressing plate and should be in input state, I
Cl1Be the difference stream effective value that is not counted in differential circuit in first at interval the electric current, I
Cl2Be the difference stream effective value that counts differential circuit in first at interval the electric current, k
3Be proportionality coefficient, I
ClIt is the effective value of the electric current at first interval; 0.3＜k
3＜0.9,20ms≤t
2≤ 200ms.Here, spacing current is by the merge cells collection and be transferred to differential protection, I
Cl1, I
Cl2, I
ClConcrete account form can carry out according to the general technical approach of differential protection, the present invention is not limited.
Step 5: be in exit status when a SV receives soft pressing plate, first at interval at inspecting state, and satisfies a period of time that imposes a condition, and as shown in Figure 8, differential protection carries out following operation:
Step 5a: when first at interval the wrong sign of current data, differential protection sends the alarm signal that the pressing plate state is checked in prompting, and the Blocking Differential Protection logic is marked in execution error;
Step 5b: when first at interval the current data inerrancy sign, differential protection is traced back to first at interval the electric current before fault takes place, and recomputates differential protection, obtains first kind of result of calculation m
1With second kind of result of calculation m
2, first kind of result of calculation m
1Be the differential protection result of calculation of first at interval the electric current when participating in differential current and calculating, second kind of result of calculation m
2Be the differential protection result of calculation of first at interval the electric current when not participating in differential current and calculating; Differential protection is according to first kind of result of calculation m
1With second kind of result of calculation m
2Carry out logic and judge, and carry out correct action;
The present invention imposes a condition and one is: first at interval from the fault-free electric current to fault current and retention time t are arranged
3, time t
3Recomputate time t greater than differential protection
4
Here, differential protection judges that at interval whether first be that the inspecting state of merge cells and differential protection is exported by communication message because all be 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 first interval also is to be transferred to differential protection by similar communication message; the present invention does not limit its embodiment; those skilled in the art can carry out according to this area set-up mode commonly used; such as, it can be transferred to differential protection by merge cells.T in the condition 1
3Recomputate time t greater than differential protection
4, its reason is to recomputate to differential protection stays time enough.The present invention does not limit the concrete time, but as preferred, 40ms≤t
3≤ 70ms, 30ms≤t
4≤ 60ms.
Wrong mark Blocking Differential Protection logic is the logic that differential protection carries out differential protection among the step 5a, can carry out with reference to the protection setting of general differential protection.
First kind of result of calculation m
1, second kind of result of calculation m
2Be this area differential protection account form commonly used, the present invention does not further limit.Differential protection is according to first kind of result of calculation m
1With second kind of result of calculation m
2Carry out logic and judge, 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 first kind of result of calculation m
1The time differential action, and according to second kind of result of calculation m
2The time differential also action, the warning signal that the pressing plate state is checked in prompting is sent in then differential protection action;
Step 5b2: if according to first kind of result of calculation m
1The time difference is done easily, and according to second kind of result of calculation m
2In time, differentially also be failure to actuate, and then differential protection is failure to actuate, and sends the warning signal that the pressing plate state is checked in prompting;
Step 5b3: if according to first kind of result of calculation m
1The time differential action, and according to second kind of result of calculation m
2The time difference is done easily, and then differential protection is failure to actuate, and jumps the switch at first interval, and sends the warning signal that the pressing plate state is checked in prompting;
Step 5b4: if according to first kind of result of calculation m
1The time difference is done easily, and according to second kind of result of calculation m
2The time differential action, then differential protection is failure to actuate, and a SV is received soft pressing plate place the input state, sends the alarm signal that prompting pressing plate mistake withdraws from.
Further, differential if differential protection is phase-splitting, then the judged result of each phase again through or, with, 3 get in the logics such as 2 any logic and judge again finally output, this effect mainly is for increasing the reliability of judgement.
A kind of method that prevents the differential protection incorrect operation of the present invention can prevent effectively that the mistake that SV receives soft pressing plate from withdrawing from the generation that causes differential protection incorrect operation situation, improved the fail safe of intelligent grid operation.
More than show and described basic 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, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.
Claims (8)
1. a method that prevents the differential protection incorrect operation is characterized in that, comprising:
Step 1: differential protection judges that uninterruptedly all have no current at interval;
Step 2: differential protection judges that uninterruptedly all have or not fault current at interval;
Step 3: when with first at interval a corresponding SV receive soft pressing plate and be in the input state, and a SV received soft pressing plate withdraw from when operating, differential protection carries out following operation:
Step 3a: when being separated with electric current for first, differential protection sends prompting clamp operation unsuccessful alarm signal, Blocking Differential Protection not, and to keep a SV to receive soft pressing plate be the input state;
Step 3b: when first at interval during no current, differential protection receives soft pressing plate with a SV and places exit status;
Step 4: be in exit status when a SV receives soft pressing plate, first is separated with electric current, and first at interval when inspecting state, and differential protection carries out following operation:
Step 4a: differential protection sends the alarm signal that the pressing plate state is checked in prompting;
Step 4b: when differential protective device was judged a SV and received soft pressing plate and should be in the input state according to electric current at interval, differential protection sent the alarm signal that prompting pressing plate mistake withdraws from, and a SV is received soft pressing plate placed the input state;
Step 5: be in exit status when a SV receives soft pressing plate, first at interval at inspecting state, and satisfies a period of time that imposes a condition, and differential protection carries out following operation:
Step 5a: when first at interval the wrong sign of current data, differential protection sends the alarm signal that the pressing plate state is checked in prompting, and the Blocking Differential Protection logic is marked in execution error;
Step 5b: when first at interval the current data inerrancy sign, differential protection is traced back to first at interval the electric current before fault takes place, and recomputates differential protection, obtains first kind of result of calculation m
1With second kind of result of calculation m
2, first kind of result of calculation m
1Be the differential protection result of calculation of first at interval the electric current when participating in differential current and calculating, second kind of result of calculation m
2Be the differential protection result of calculation of first at interval the electric current when not participating in differential current and calculating; Differential protection is according to first kind of result of calculation m
1With second kind of result of calculation m
2Carry out logic and judge, and carry out correct action;
Described imposing a condition one is: first at interval from the fault-free electric current to fault current and retention time t are arranged
3, time t
3Recomputate time t greater than differential protection
4
2. a kind of method that prevents the differential protection incorrect operation according to claim 1 is characterized in that described step 1 comprises: if the electric current of any phase is greater than the threshold electric current I at interval
Set1, retention time t
1, then differential protection is separated with electric current between judging; If the electric current of each phase is all less than the threshold electric current I at interval
Set2, then differential protection is judged no current at interval; The threshold electric current I
Set2Equal the threshold electric current I
Set1Multiply by resetting ratio k
1, resetting ratio k
1Less than 1.
3. a kind of method that prevents the differential protection incorrect operation according to claim 2 is characterized in that the threshold electric current I
Set1Equal load current value and multiply by proportionality coefficient p, 0＜p≤0.02; Time-delay t
1Value is 20ms≤t
1≤ 200ms.
4. a kind of method that prevents the differential protection incorrect operation according to claim 1 is characterized in that described step 2 comprises: if the electric current of any phase is greater than the threshold electric current I at interval
Set3, then differential protection is separated with fault current between judging; If the electric current of each phase is all less than the threshold electric current I at interval
Set4, then differential protection is judged fault-free electric current at interval; The threshold electric current I
Set4Equal the threshold electric current I
Set3Multiply by resetting ratio k
2, resetting ratio k
2Less than 1.
5. a kind of method that prevents the differential protection incorrect operation according to claim 4 is characterized in that the threshold electric current I
Set3Equal differential operating current definite value and multiply by safety factor q, 0＜q＜1.
6. a kind of method that prevents the differential protection incorrect operation according to claim 1 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 is judged a SV and is received soft pressing plate and should be in input state, I
Cl1Be the difference stream effective value that is not counted in differential circuit in first at interval the electric current, I
Cl2Be the difference stream effective value that counts differential circuit in first at interval the electric current, k
3Be proportionality coefficient, I
ClIt is the effective value of the electric current at first interval; 0.3＜k
3＜0.9,, 20ms≤t
2≤ 200ms.
7. a kind of method that prevents the 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 that prevents the differential protection incorrect operation according to claim 1 is characterized in that described step 5b comprises:
Step 5b1: if according to first kind of result of calculation m
1The time differential action, and according to second kind of result of calculation m
2The time differential also action, the warning signal that the pressing plate state is checked in prompting is sent in then differential protection action;
Step 5b2: if according to first kind of result of calculation m
1The time difference is done easily, and according to second kind of result of calculation m
2In time, differentially also be failure to actuate, and then differential protection is failure to actuate, and sends the warning signal that the pressing plate state is checked in prompting;
Step 5b3: if according to first kind of result of calculation m
1The time differential action, and according to second kind of result of calculation m
2The time difference is done easily, and then differential protection is failure to actuate, and jumps the switch at first interval, and sends the warning signal that the pressing plate state is checked in prompting;
Step 5b4: if according to first kind of result of calculation m
1The time difference is done easily, and according to second kind of result of calculation m
2The time differential action, then differential protection is failure to actuate, and a SV is received soft pressing plate place the input state, sends the alarm signal that prompting pressing plate mistake withdraws from.
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| CN103746351A (en) * | 2013-11-26 | 2014-04-23 | 清华大学 | Power system failure alarm method taking digitized substation secondary circuit signals into account |
| CN104483857A (en) * | 2014-11-13 | 2015-04-01 | 国家电网公司 | Optical digital sampling value relaying protection device-based sampling value display method and system |
| CN104734118A (en) * | 2015-03-16 | 2015-06-24 | 国网山西省电力公司电力科学研究院 | Direct recognizing system for intelligent substation transformer differential protection on/off states |
| 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 |
| CN106787171A (en) * | 2016-11-28 | 2017-05-31 | 国网江苏省电力公司检修分公司 | It is a kind of to prevent from being spaced the method that the soft pressing plate miscarryings of SV are moved 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09294328A (en) * | 1996-04-24 | 1997-11-11 | Tokyo Electric Power Co Inc:The | Current differential relay |
| 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 | 南京中德保护控制系统有限公司 | 500kV unmanned transformer station-based remote control method for protective soft pressing plate |
-
2013
- 2013-05-20 CN CN201310187740.6A patent/CN103280776B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09294328A (en) * | 1996-04-24 | 1997-11-11 | Tokyo Electric Power Co Inc:The | Current differential relay |
| 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 | 南京中德保护控制系统有限公司 | 500kV unmanned transformer station-based remote control method for protective soft pressing plate |
Non-Patent Citations (1)
| Title |
|---|
| 李园园等: "全数字化线路保护PCS-931在苏州东工程中的应用", 《华东电力》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN103746351A (en) * | 2013-11-26 | 2014-04-23 | 清华大学 | Power system failure alarm method taking digitized substation secondary circuit signals into account |
| CN103746351B (en) * | 2013-11-26 | 2016-05-25 | 清华大学 | Consider the electric power system fault alarm method of digitalized substation secondary loop signal |
| CN104483857A (en) * | 2014-11-13 | 2015-04-01 | 国家电网公司 | Optical digital sampling value relaying protection device-based sampling value display method and system |
| CN104734118A (en) * | 2015-03-16 | 2015-06-24 | 国网山西省电力公司电力科学研究院 | Direct recognizing system for intelligent substation transformer differential protection on/off states |
| 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 |
| CN106787171A (en) * | 2016-11-28 | 2017-05-31 | 国网江苏省电力公司检修分公司 | It is a kind of to prevent from being spaced the method that the soft pressing plate miscarryings of SV are moved back |
| 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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