CN107134763A - The method of discrimination that a kind of fault trip is quickly returned - Google Patents
The method of discrimination that a kind of fault trip is quickly returned Download PDFInfo
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- CN107134763A CN107134763A CN201710568499.XA CN201710568499A CN107134763A CN 107134763 A CN107134763 A CN 107134763A CN 201710568499 A CN201710568499 A CN 201710568499A CN 107134763 A CN107134763 A CN 107134763A
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- fault trip
- half cycle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention discloses the method for discrimination that a kind of fault trip is quickly returned, comprise the following steps：In the case of system jam, protection starts, and into fault trip flow, sends trip signal；Corresponding jump, which is obtained, from fault trip module makes information；If not jumping order, clear fault trip Returning mark is now performed；In the case where there is jump to make, the half cycle difference Fourier value of electric current is obtained；If electric current half cycle difference Fourier value is less than threshold, fault trip Returning mark is put in execution, is otherwise performed half cycle DC component and is calculated；If calculating obtained half cycle DC component to be more thanThen judge that fault trip is returned, fault trip Returning mark is put in execution, otherwise performs clear fault trip Returning mark.When protection act breaker after a failure of the invention disconnects, not by serious CT smearing effects, the excision situation that is out of order quickly is sentenced；Algorithm can be sentenced in 15ms, greatly improve the Reliability of Microprocessor of breaker fail protection.
Description
Technical field
The present invention relates to technical field of relay protection, the method for discrimination that especially a kind of fault trip is quickly returned.
Background technology
With the raising of line voltage grade, the sectional area of wire of transmission line of electricity also increases, and the resistance value of wire is then corresponding
Reduce, cause the increase of the timeconstantτ (the ratio between circuit inductance and resistance that short circuit current flow flows through) of primary system DC component.
τ increases can extend the die-away time of aperiodic component in short circuit current flow, on the one hand easily cause the transient state saturation of current transformer,
So as to cause the distortion of secondary current；On the other hand the CT conditions of streakings after breaker disconnection are caused.Serious CT hangovers have can
The action behavior of route protection can be influenceed, order is jumped due to that can not withdraw in time, single-hop failure (150ms) three is jumped during single-phase fault,
Many phase faults three are jumped failure (150ms) and jumped forever, and this can all make route protection lose the chance of automatic reclosing.Serious CT hangovers
The Reliability of Microprocessor of breaker fail protection is potentially affected, or even causes larger range of power failure, serious electric power is caused
Accident and huge economic loss.As shown in figure 3, according to failure protection logic, if it is possible to the excision of quick identification failure or
Disappear, it is ensured that outside jump order open into quick return and failure protection current element quick return, can greatly improve
The Reliability of Microprocessor of failure protection.
《National grid Protection Technology development outline》In middle Protection Technology development priority direction chapters and sections, clearly
Research CT hangover identification technologies are proposed, strives malfunctioning switch (dead band) mute time being compressed within 200ms, reduces direct current system
Continuous commutation failure number of times occurs for system, prevents from triggering stabilization of power grids malicious event.Therefore, " CT conditions of streakings " is accurately identified, i.e.,
The quick identification actual excision of failure, has very important meaning for the stability of power system, and reliability of operation.
Fourier algorithm is wide variety of algorithm in current power system microcomputer protective relay, can be precisely calculated defeated
The electric current entered, fundamental wave and each harmonic in voltage signal, and harmonic wave ability is filtered out with very strong, but it can not filter out and decline
The DC component subtracted.In order to suppress the influence of the DC component decayed, the fourier algorithm of difference can be used, such as formula (2) institute
Show.Conditions of streaking is not serious after failure removal, in the case of DC component initial value is less, as long as data window is met, just can be accurate
Really calculate actual fundamental wave value.But it is serious for conditions of streaking, in the case that direct current initial value is larger, it is limited by decay
The influence of time, the time for accurately calculating actual fundamental wave value can be long.Such as show such as Fig. 1, the numerical value that Difference Calculation is obtained
The general 70ms times are just less than 0.04A (nothings of the 0.04A generally as route protection in the case of the specified CT of 1A after failure removal
Flow threshold).
In order to debate knowledge conditions of streaking, also there is the method for using for a long time not zero crossing, i.e. 3/4 cycle or 1 cycle time do not have
Have zero passage, be considered as being DC component entirely, decide that be failure removal hangover.Erroneous judgement is possible to without stream, if now real
Malfunctioning switch, according to Fig. 3 logic, failure actuation time is possible to postpone, or even tripping.
The content of the invention
The technical problems to be solved by the invention are there is provided the method for discrimination that a kind of fault trip is quickly returned, can
Not by serious CT smearing effects, the excision situation that is out of order quickly is sentenced.
In order to solve the above technical problems, the present invention provides the method for discrimination that a kind of fault trip is quickly returned, including it is as follows
Step：
(1) in the case of system jam, protection starts, and into fault trip flow, sends trip signal；
(2) obtain corresponding jump from fault trip module and make information；
(3) if not jumping order, it is that the trip condition of external area error or protection is not up to show phylogenetic failure,
Now perform clear fault trip Returning mark；
(4) in the case where there is jump to make, the half cycle difference Fourier value of electric current is obtained；If electric current half cycle difference Fourier
Value is less than threshold, then performs and put fault trip Returning mark, otherwise performs half cycle DC component and calculates；
(5) it is more than if calculating obtained half cycle DC componentThen judge that fault trip is returned, failure is put in execution
Trip Returning mark, otherwise performs clear fault trip Returning mark；Wherein,Represent the modulus value of difference Fourier electric current, k
It is the coefficient of comparisons threshold of DC component and fundametal compoment.
It is preferred that, in step (2), order return in time is jumped in outside or failure protection current element returns can prevent in time
Failure protection malfunction；The source protection for jumping order is sent out to failure protection, is obtained directly from the logic of oneself and jumps order；Protected for failure
Protect, it is to be opened by outside into the tripping operation information of the other protection of acquisition to obtain and jump the mode made.
It is preferred that, in step (4), half cycle difference Fourier's value of electric current is stored in general analog quantity Buffer.
It is preferred that, in step (4), if not got from general analog quantity Buffer in half cycle difference Fu of electric current
Leaf value, then difference Fourier's value of calculating current be specially： Its
Middle x(k)Electric current real-time sampling value is represented, N represents every cycle sampling number, and θ=2 π/N represents sampling angle interval, ej·i·θ=
Cos (i θ)+jsin (i θ) is the Euler's formula representation of fourier coefficient,The current vector of 1 difference is represented,
K is the coefficient of comparisons threshold of DC component and fundametal compoment.
It is preferred that, in step (5), half cycle DC component, which is calculated, is specially：Wherein
x(k)Electric current real-time sampling value is represented, N represents every cycle sampling number, Idc(k)DC component is represented, k is DC component and fundamental wave
The coefficient of comparisons threshold of component.
Beneficial effects of the present invention are：When protection act breaker after a failure of the invention disconnects, do not dragged by serious CT
Tail influences, and quickly sentences the excision situation that is out of order, and withdraws tripping operation outlet；Algorithm can be sentenced in 15ms, and conventional algorithm is general
More than 30ms, or even longer time are needed, the Reliability of Microprocessor of breaker fail protection can be so greatly improved, prevent from causing
It is larger range of to have a power failure, and then prevent serious electric power accident；Protection device uses this programme, and can improve power system can
By property.
Brief description of the drawings
Fig. 1 is serious CT conditions of streakings schematic diagram of the invention.
Serious waveform diagram is biased when Fig. 2 is failure of the invention.
Fig. 3 is the action logic schematic diagram of the failure protection of the present invention.
Fig. 4 is method flow schematic diagram of the invention.
Embodiment
As shown in figure 4, the method for discrimination that a kind of fault trip is quickly returned, comprises the following steps：
(1) in the case of system jam, protection starts, and into fault trip flow, sends trip signal；
(2) obtain corresponding jump from fault trip module and make information；
(3) if not jumping order, it is that the trip condition of external area error or protection is not up to show phylogenetic failure,
Now perform clear fault trip Returning mark；
(4) in the case where there is jump to make, the half cycle difference Fourier value of electric current is obtained；If electric current half cycle difference Fourier
Value is less than threshold, then performs and put fault trip Returning mark, otherwise performs half cycle DC component and calculates；
(5) it is more than if calculating obtained half cycle DC componentThen judge that fault trip is returned, failure is put in execution
Trip Returning mark, otherwise performs clear fault trip Returning mark；Wherein,Represent the modulus value of difference Fourier electric current, k
It is the coefficient of comparisons threshold of DC component and fundametal compoment.
In step (2), order return in time is jumped in outside or failure protection current element returns can prevent failure from protecting in time
Protect malfunction；The source protection for jumping order is sent out to failure protection, is obtained directly from the logic of oneself and jumps order；For failure protection, obtain
The mode for jumping order is to be opened by outside into the tripping operation information of the other protection of acquisition.
In step (4), half cycle difference Fourier's value of electric current is stored in general analog quantity Buffer.
In step (4), if not getting half cycle difference Fourier's value of electric current from general analog quantity Buffer,
Difference Fourier's value of calculating current is specially：Wherein
x(k)Electric current real-time sampling value is represented, N represents every cycle sampling number, and θ=2 π/N represents sampling angle interval, ej·i·θ=cos
(i θ)+jsin (i θ) is the Euler's formula representation of fourier coefficient,Represent the current vector of 1 difference, k
It is the coefficient of comparisons threshold of DC component and fundametal compoment.
In step (5), half cycle DC component, which is calculated, is specially：Wherein x(k)Represent electricity
Real-time sampling value is flowed, N represents every cycle sampling number, Idc(k)DC component is represented, k is the comparison of DC component and fundametal compoment
Coefficient threshold.
Fig. 4 flow chart is the operating criterion formula (3) quickly returned according to fault trip.Specific process description
It is as follows：
Step 400, only in the case of system jam, protection just launches into fault trip flow, sends jump
Lock signal, if protection indicates that system does not break down not actuated, it is not necessary to carry out fault trip and return to differentiation；
Step 401, obtain jump and make information, can see from Fig. 3 failure protection logics, outside is jumped order return in time or lost
Clever protective current element is returned in time can prevent failure protection malfunction.The source protection for jumping order is sent out to failure protection, obtains and jumps order
Mode be directly from the logic of oneself obtain；For failure protection, it is to be opened by outside into obtaining to obtain and jump the mode of order
Take the tripping operation information of other protection, such as route protection, tranformer protection；
Step 402, if not jumping order, show system hair failure be external area error or protect trip condition not
Reach, do not have the behavior that order goes execution to jump breaker of jumping now, therefore also It is not necessary to which carrying out fault trip returns to differentiation；
Step 403, in the case where there is jump to make, go to obtain the difference Fourier value of electric current first, carry out assistant criteria
Perform, because in common relay protection logic, typically can all there is other algorithm criterion to use difference current, therefore
Storage has this value in general analog quantity Buffer.If the occasion used in the present invention does not have difference Fourier value, that just must
It must be gone to calculate according to formula (2)；
Step 404, the differentiation of assistant criteria, if current-differencing Fourier value is less than threshold, just goes execution step 408 to put
Fault trip Returning mark；Otherwise with regard to the calculation procedure 405 of progress half cycle DC quantity；
Step 405, this step calculates DC quantity according to formula (1)；
Step 406, if calculating obtained DC quantityThen judge that fault trip is returned, and just goes to hold
Row step 408 puts fault trip Returning mark, otherwise performs the clear fault trip Returning mark of step 407.
Step 409, terminate.
In order to meet after existing code requirement, failure removal or disappearance, protection act time of return is more short better, preferably exists
Within 20ms, if being possible to not reach time requirement using all-round algorithm.Therefore propose in the present invention and use half cycle
Data window calculates direct current and fourier value.Specific algorithmic formula is as follows：
Half cycle DC component calculation formula：
Half cycle difference fourier calculation formula：
The operating criterion that fault trip is quickly returned
In (1), (2), (3) formula, x(k)Electric current real-time sampling value is represented, N represents every cycle sampling number, θ=2 π/N tables
Show sampling angle interval, ej·i·θ=cos (i θ)+jsin (i θ) is the Euler's formula representation of fourier coefficient, Idc(k)
Represent DC component,The current vector of 1 difference is represented,The modulus value of difference Fourier electric current is represented, k is direct current
Component and the coefficient of comparisons threshold of fundametal compoment (value 8~10), ImkIndicate that, without stream threshold, size is fixed as 0.04 times of specified electricity
Stream.
In the case where CT trails, there was only decaying DC component in electric current, fundametal compoment does not almost have.Because Fourier is calculated
Method can not filter out aperiodic component completely, for the waveform of aperiodic component, be still able to calculate certain modulus value；In failure
In the electric current at moment, fundametal compoment accounts for leading, and general decaying DC component initial value is not over fundamental wave value.Both comprehensive feelings
Condition, it is considered herein that the fundamental wave calculated value that DC component is more than 8 times is taken as fault trip.Consider further that dc-decay is complete
Situation about entirely, or without CT trailing, in order to ensure the continuation of result of determination, adds an assistant criteria, i.e. difference
Fourier value is less than without stream threshold Imk, it is considered as failure removal.The present invention uses half cycle data window, in 50Hz, is adopted per cycle
Sample N=24 points, the time required to difference fourier uses (N/2+1) point data, about 11ms, the task scheduling for considering further that algorithm,
It is that can accurately determine whether fault trip certainly within 15ms.
As shown in Fig. 2 fault moment DC component is maximum, electric current is lifted on transverse axis completely, afterwards DC component
Gradually decay.
There is following benefit using above-mentioned technical proposal：Waveform biasing serious two kinds of feelings when taking into account " CT hangovers " and failure
Condition；Actuation time is fast, and failure removal or disappearance are determined within 15ms；Required input sampled point quantity is few, and algorithm succinctly facilitates,
Program is conducive to realize.
Using set forth herein scheme, after a failure protection act breaker disconnect when, not by serious CT smearing effects,
It is quick to sentence the excision situation that is out of order, withdraw tripping operation outlet.Algorithm can be sentenced in 15ms, and conventional algorithm generally requires 30ms
More than, or even the longer time.The Reliability of Microprocessor of breaker fail protection can be so greatly improved, prevents from causing wider
Power failure, and then prevent serious electric power accident.Protection device uses this programme, can improve the reliability of power system.
Although the present invention is illustrated and described with regard to preferred embodiment, it is understood by those skilled in the art that
Without departing from scope defined by the claims of the present invention, variations and modifications can be carried out to the present invention.
Claims (5)
1. the method for discrimination that a kind of fault trip is quickly returned, it is characterised in that comprise the following steps：
(1) in the case of system jam, protection starts, and into fault trip flow, sends trip signal；
(2) obtain corresponding jump from fault trip module and make information；
(3) if not jumping order, it is that the trip condition of external area error or protection is not up to show phylogenetic failure, now
Perform clear fault trip Returning mark；
(4) in the case where there is jump to make, the half cycle difference Fourier value of electric current is obtained；If electric current half cycle difference Fourier value is small
In threshold, then perform and put fault trip Returning mark, otherwise perform half cycle DC component and calculate；
(5) it is more than if calculating obtained half cycle DC componentThen judge that fault trip is returned, fault trip is put in execution
Returning mark, otherwise performs clear fault trip Returning mark；Wherein,The modulus value of difference Fourier electric current is represented, k is straight
The coefficient of comparisons threshold of flow component and fundametal compoment.
2. the method for discrimination that fault trip as claimed in claim 1 is quickly returned, it is characterised in that in step (2), outside is jumped
Order is returned in time or timely return of failure protection current element can prevent failure protection malfunction；Sent out to failure protection and jump order
Source protection, obtains directly from the logic of oneself and jumps order；For failure protection, obtaining and jumping the mode made is opened by outside
Enter, obtain the tripping operation information of other protection.
3. the method for discrimination that fault trip as claimed in claim 1 is quickly returned, it is characterised in that in step (4), electric current
Half cycle difference Fourier's value is stored in general analog quantity Buffer.
4. the method for discrimination that fault trip as claimed in claim 3 is quickly returned, it is characterised in that in step (4), if from logical
Half cycle difference Fourier's value of electric current is not got in analog quantity Buffer, then the difference Fourier value tool of calculating current
Body is：Wherein x(k)Represent electric current real-time sampling value, N
Represent that, per cycle sampling number, θ=2 π/N represents sampling angle interval, ej·i·θ=cos (i θ)+jsin (i θ) is Fu
The Euler's formula representation of vertical leaf system number,The current vector of 1 difference is represented, k is the ratio of DC component and fundametal compoment
Compared with coefficient threshold.
5. the method for discrimination that fault trip as claimed in claim 1 is quickly returned, it is characterised in that in step (5), half cycle is straight
Flow component is calculated：Wherein x(k)Electric current real-time sampling value is represented, N represents every cycle
Sampling number, Idc(k)DC component is represented, k is the coefficient of comparisons threshold of DC component and fundametal compoment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631258A (en) * | 2018-05-18 | 2018-10-09 | 许继集团有限公司 | Breaker failure method of discrimination based on fourier algorithm, control method and device |
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| CN105929217A (en) * | 2016-05-12 | 2016-09-07 | 国电南瑞科技股份有限公司 | Method for discriminating tail current in ineffective protection based on DC component blocking |
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2017
- 2017-07-13 CN CN201710568499.XA patent/CN107134763B/en active Active
Patent Citations (2)
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| CN106451369A (en) * | 2015-08-13 | 2017-02-22 | 中国电力科学研究院 | Current transformer tail current truncation method in failure protection |
| CN105929217A (en) * | 2016-05-12 | 2016-09-07 | 国电南瑞科技股份有限公司 | Method for discriminating tail current in ineffective protection based on DC component blocking |
Non-Patent Citations (2)
| Title |
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| N.T. STRINGER: "The effect of DC offset on current-operated relays", 《IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108631258A (en) * | 2018-05-18 | 2018-10-09 | 许继集团有限公司 | Breaker failure method of discrimination based on fourier algorithm, control method and device |
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