CN105929217A - Method for discriminating tail current in ineffective protection based on DC component blocking - Google Patents
Method for discriminating tail current in ineffective protection based on DC component blocking Download PDFInfo
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- CN105929217A CN105929217A CN201610311441.2A CN201610311441A CN105929217A CN 105929217 A CN105929217 A CN 105929217A CN 201610311441 A CN201610311441 A CN 201610311441A CN 105929217 A CN105929217 A CN 105929217A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention discloses a method for discriminating ineffective protection tail current based on DC component blocking. The method uses proportion of DC component in a phase current to determine an ineffective tail current. The method is easy to operate, has high efficiency, greatly reduces the time of a replay protection apparatus in discriminating the ineffective tail current, and effectively increases accuracy in discriminating the ineffective tail current. The method makes it possible that when a fault current occurs, the ineffective protection does not refuse initiation, and when a CT tail current occurs, the ineffective protection is not wrongfully initiated, and the method accelerates phase-splitting and ineffective protection, prevents enlargement of an accident, and provides better safeguard for safe and stable operation of a power grid.
Description
Technical field
The present invention relates to a kind of failure protection current tail method of discrimination based on DC component locking, belong to electricity
Force system relay protection field.
Background technology
Protective relaying device is the part that power system is inseparable, be ensure power equipment safety and prevent,
Limit most basic, the most important and maximally effective technological means of power system large-area power-cuts.But, when being
System breaks down, and protective relaying device sends trip signal, after chopper disconnects excision primary fault, and electromagnetism
The secondary of type current transformer still suffers from the electric current of decay, i.e. CT (Current Transformer, Current Mutual Inductance
Device) conditions of streaking.CT tail currents may cause the electric current criterion of breaker fail protection quickly to return,
Arrive the possible malfunction of failure protection after delay time, so that fault coverage expands and causes large-area power-cuts etc.
Serious consequence.At present, the method for discrimination for failure protection current tail is few, commonly used tail currents
Not this criterion of zero crossing, but tail currents is after the change of disease of protection device CT, in fact it could happen that current zero-crossing point
Phenomenon, its suitability is the strongest.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of failure protection based on DC component locking
Current tail method of discrimination.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of failure protection current tail method of discrimination based on DC component locking, comprises the following steps,
Step 1, the maximum circuitry number of definition is M；
Step 2, defines X=1；
Step 3, read X article of branch road malfunctioning open into；
Step 4, calculates malfunctioning current condition；
Step 5, calculates phase current first-harmonic virtual value I of the previous cycle of X article of branch road；
Step 6, if I is < NIn, then go to step 7, if I >=NIn, the differentiation of the most malfunctioning tail currents is opened
Dynamic, go to step 8；
Wherein, InFor rated current, N is the rated current multiple that can arrange；
Step 7, it is judged that X, whether less than M, if it is, X=X+1, goes to step 3, if it is not,
Then go to step 2；
Step 8, calculates DC component I in phase currentz；
Step 9, it is judged that Iz/I≥K1setAnd Iz/Irms≥K2setWhether setting up, if set up, then being judged to lose
Spirit tail currents, locking correspondence phase failure protection, flow process terminates；If be false, flow process terminates；
Wherein, K1setAnd K2setFor threshold value, IrmsFor phase current real effective.
Same branch road is by differentiating the most respectively, if A phase meets a rear locking A phase failure protection, B phase or C phase
Or the malfunctioning not locking of three-phase；Between a plurality of branch road separate, each differentiate.
The beneficial effect that the present invention is reached: the present invention utilizes the scale of DC component in phase current to sentence
Disconnected malfunctioning tail currents, simple efficiency is high, greatly reduces protective relaying device and differentiates malfunctioning tail currents
Time, be effectively improved the discriminant accuracy of malfunctioning tail currents, failure protection not tripping during fault current,
Failure protection not malfunction during CT tail currents, and accelerate split-phase locking failure protection, it is therefore prevented that fault spread,
There is provided for power network safety operation and preferably ensure.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Fig. 2 is malfunctioning tail currents start-up criterion logic chart.
Fig. 3 is malfunctioning tail currents decision logic figure.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating
Technical scheme, and can not limit the scope of the invention with this.
As it is shown in figure 1, a kind of failure protection current tail method of discrimination based on DC component locking, including
Following steps:
Step 1, the maximum circuitry number of definition is M.
Step 2, defines X=1.
Step 3, read X article of branch road malfunctioning open into.
Step 4, calculates malfunctioning current condition；
Step 5, calculates phase current first-harmonic virtual value I of the previous cycle of X article of branch road.
Step 6, if I is < NIn, then go to step 7, if I >=NIn, the differentiation of the most malfunctioning tail currents is opened
Dynamic, go to step 8；Wherein, InFor rated current, N is the rated current multiple that can arrange.
As in figure 2 it is shown, malfunctioning tail currents start-up criterion includes malfunctioning opening into, malfunctioning current condition and Ben Zhi
Road previous cycle size of current, wherein, malfunctioning current condition includes zero-sequence current, negative-sequence current and Sudden Changing Rate
Electric current.A phase is malfunctioning to be opened into=1, the malfunctioning current condition of A phase meets and IA >=NIn phase "AND" composition A phase
Malfunctioning tail currents start-up criterion, B phase and C phase criterion are with A phase；Three-phase is malfunctioning to be opened into=1, three-phase current
Condition meets and Ia≥NIn、Ib≥NIn、Ic≥NInPhase "AND" composition three-phase malfunctioning tail currents start-up criterion,
Ia、Ib、IcIt is respectively A, B, C phase current first-harmonic virtual value；A phase or B phase or the malfunctioning tail currents of C phase
Start the malfunctioning tail currents of "or" three-phase to start, then " malfunctioning tail currents criterion starts=1 ", enter malfunctioning
Tail currents differentiates logic.
Step 7, it is judged that X, whether less than M, if it is, X=X+1, goes to step 3, if it is not,
Then go to step 2.
Step 8, calculates DC component I in phase currentz。
Step 9, it is judged that Iz/I≥K1setAnd Iz/Irms≥K2setWhether setting up, if set up, then being judged to lose
Spirit tail currents, locking correspondence phase failure protection, flow process terminates；If be false, flow process terminates；Wherein,
K1setAnd K2setFor threshold value, IrmsFor phase current real effective.
As it is shown on figure 3, I in figureazFor DC component, I in A phase currentarmsFor A phase current real effective,
IbzFor DC component, I in B phase currentbrmsFor B phase current real effective, IczDivide for direct current in C phase current
Amount, IcrmsFor C phase current real effective.After malfunctioning tail currents differentiates startup, enter malfunctioning tail currents
Differentiate logic, be malfunctioning tail currents or fault current with the electric current distinguished now." malfunctioning tail currents opens
Dynamic=1 ", Iaz/Ia≥K1setAnd Iaz/Iarms≥K2setMaking "AND", three conditions meet simultaneously, then locking this
Road A phase failure protection；B phase and C phase criterion are with A phase；When three conditions of A, B, C phase while the most all
When meeting, locking three-phase failure protection.Same branch road is by differentiating the most respectively, if A phase meets a rear locking A
Phase failure protection, B phase or C phase or the malfunctioning not locking of three-phase；Between a plurality of branch road separate, each sentence
Not.
Said method utilizes in phase current the scale of DC component to judge malfunctioning tail currents, the most easily
Line efficiency is high, greatly reduces protective relaying device and differentiates the time of malfunctioning tail currents, is effectively improved malfunctioning dragging
The discriminant accuracy of tail current, failure protection not tripping during fault current, during CT tail currents, failure protection is not
Malfunction, and accelerate split-phase locking failure protection, it is therefore prevented that fault spread, provide for power network safety operation
Preferably ensure.
The above is only the preferred embodiment of the present invention, it is noted that common for the art
For technical staff, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and change
Shape, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (2)
1. a failure protection current tail method of discrimination based on DC component locking, it is characterised in that: bag
Include following steps,
Step 1, the maximum circuitry number of definition is M；
Step 2, defines X=1；
Step 3, read X article of branch road malfunctioning open into；
Step 4, calculates malfunctioning current condition；
Step 5, calculates phase current first-harmonic virtual value I of the previous cycle of X article of branch road；
Step 6, if I is < NIn, then go to step 7, if I >=NIn, the differentiation of the most malfunctioning tail currents is opened
Dynamic, go to step 8；
Wherein, InFor rated current, N is the rated current multiple that can arrange；
Step 7, it is judged that X, whether less than M, if it is, X=X+1, goes to step 3, if it is not,
Then go to step 2；
Step 8, calculates DC component I in phase currentz；
Step 9, it is judged that Iz/I≥K1setAnd Iz/Irms≥K2setWhether setting up, if set up, then being judged to lose
Spirit tail currents, locking correspondence phase failure protection, flow process terminates；If be false, flow process terminates；
Wherein, K1setAnd K2setFor threshold value, IrmsFor phase current real effective.
A kind of failure protection current tail based on DC component locking the most according to claim 1 differentiates
Method, it is characterised in that: same branch road is by differentiating the most respectively, if A phase meets a rear locking malfunctioning guarantor of A phase
Protect, B phase or C phase or the malfunctioning not locking of three-phase；Between a plurality of branch road separate, each differentiate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610311441.2A CN105929217B (en) | 2016-05-12 | 2016-05-12 | A kind of failure protection current tail method of discrimination based on DC component locking |
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| CN201610311441.2A CN105929217B (en) | 2016-05-12 | 2016-05-12 | A kind of failure protection current tail method of discrimination based on DC component locking |
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| CN105929217A true CN105929217A (en) | 2016-09-07 |
| CN105929217B CN105929217B (en) | 2019-01-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106451328A (en) * | 2016-11-22 | 2017-02-22 | 长园深瑞继保自动化有限公司 | Adaptive breaker failure protection method |
| CN107134763A (en) * | 2017-07-13 | 2017-09-05 | 积成软件有限公司 | The method of discrimination that a kind of fault trip is quickly returned |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451328A (en) * | 2016-11-22 | 2017-02-22 | 长园深瑞继保自动化有限公司 | Adaptive breaker failure protection method |
| CN106451328B (en) * | 2016-11-22 | 2018-11-13 | 长园深瑞继保自动化有限公司 | Adaptive breaker fail protection method |
| CN107134763A (en) * | 2017-07-13 | 2017-09-05 | 积成软件有限公司 | The method of discrimination that a kind of fault trip is quickly returned |
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| Publication number | Publication date |
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| CN105929217B (en) | 2019-01-08 |
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Effective date of registration: 20161221 Address after: High road high tech Zone of Nanjing City, Jiangsu Province, No. 20 210061 Applicant after: NARI Technology Development Co., Ltd. Applicant after: SGCC NARI Nanjing Control System Co., Ltd. Applicant after: State Grid Tianjin Electric Power Company Applicant after: State Power Networks Co Applicant after: Nanjing Nari Group Corporation Address before: High road high tech Zone of Nanjing City, Jiangsu Province, No. 20 210061 Applicant before: NARI Technology Development Co., Ltd. Applicant before: SGCC NARI Nanjing Control System Co., Ltd. Applicant before: State Grid Tianjin Electric Power Company Applicant before: State Power Networks Co |
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