CN105974304A - Fault diagnosis method for engaging and disengaging coil of circuit breaker - Google Patents
Fault diagnosis method for engaging and disengaging coil of circuit breaker Download PDFInfo
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- CN105974304A CN105974304A CN201610302947.7A CN201610302947A CN105974304A CN 105974304 A CN105974304 A CN 105974304A CN 201610302947 A CN201610302947 A CN 201610302947A CN 105974304 A CN105974304 A CN 105974304A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a fault diagnosis method for an engaging and disengaging coil of a circuit breaker. According to the invention, current of the engaging and disengaging coil of the circuit breaker is taken as the diagnosis object, normal data of the engaging and disengaging coil of the circuit breaker is collected to form a data base and then an improved dynamic time scheduling algorithm is utilized for comparing the detection data with data in the normal data base for judging whether faults occur. According to the improved dynamic time scheduling algorithm, a cost matrix is calculated based on the detection data and the normal data and an accumulation cost matrix is calculated by adopting a constraint condition of an Sakoe-Chiba window and two groups of scheduling paths with optimal data are found in the accumulation cost matrix and are displayed on a t-t map. If the optimal scheduling paths offset, the engaging and disengaging coil of the circuit breaker meets faults and the fault type can be determined based on the offset time point and type of the optimal scheduling paths. Compared with other fault diagnosis method, the method provided by the invention is simple in computation process and more accurate and direct in diagnosis results.
Description
Technical field
The present invention relates to the method for diagnosing faults of a kind of circuit-breaker switching on-off coil, belong to circuit breaker failure diagnostic techniques.
Background technology
In power system, chopper is one of extremely important main equipment.For ensureing the reliability service of chopper, open circuit
Device state inspection is increasingly paid attention to, and also has higher requirement the method for diagnosing faults of chopper simultaneously.Root
According to State Grid Corporation in 2004 statistical data, 7.2 ~ 550kV totally 275373 primary cut-out faults 392 times, wherein tripping
Fault has accounted for the 23% of sum.Point, closing coil be the key mechanism of starting circuit breaker separating brake and feed motion, point, closing line
Circle breaks down and easily causes chopper generation tripping or malfunction, and then can cause great security incident.It is achieved that to disconnected
Road device divides, the fault diagnosis of closing coil is to ensure that the important means of chopper reliability service.
At present, the method for diagnosing faults of circuit-breaker switching on-off coil uses wavelet analysis, support vector machine, particle more
Group, the algorithm of fuzzy theory, it is more complicated that these algorithms calculate process.And using a kind of calculating process simple, result of calculation is accurate
Really, method carries out fault diagnosis and would is that the development of following circuit breaker failure diagnostic techniques circuit-breaker switching on-off coil intuitively
Direction.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provides the fault diagnosis of a kind of circuit-breaker switching on-off coil
Method, chopper is divided by the dynamic time warping algorithm that the method utilization improves, closing coil current detecting data carry out fault
Diagnosis.
The concrete technical scheme that the present invention uses is as follows:
A kind of method for diagnosing faults of circuit-breaker switching on-off coil, it realizes process as it is shown in figure 1, include following step:
Step 1, switching winding, the current data of closing coil when gathering chopper action in normal state, by these data
Composition data base；
Step 2, using the current data that detects as testing time sequence T,, a length of m, take one
Group normal data as reference time array R,, a length of n, two time series one meters of composition
Calculation group；
Step 3, calculates the Euclidean distance between testing time sequence and each element of normal time sequence, generates cost matrix, the computing formula of each element of cost matrix is as follows:
；
Step 4, finds a paths to make the cumulative distance between two groups of data elements the shortest, to reach two groups from cost matrix
The optimal coupling of data, accumulative cost function of structure for this:
,
Wherein Q is all regular paths,；And data T are detected in path during accumulative cost function acquirement minima exactly
And the regular path of optimum between normal data Rq*, i.e.
；
Use the constraints of Sakoe-Chiba window, calculate the element of accumulative cost matrix the first row
,
Calculate the element of accumulative cost matrix first row
,
Calculate other elements in addition to the first row and first row
；
Step 5, compares successively by the normal data of detection data with lane database, takes and calculates the accumulative of last point
One group of distance minimum as Optimum Matching；
Step 6, calculates and the principle of reverse optimizing according to forward, from point (1,1) to point (m, n) calculates accumulative cost matrix,
In the accumulative cost matrix of Optimum Matching, from point, (m n) finds optimum regular path to point (1,1), finds optimum regular path
Mode is searched by reverse Sakoe-Chiba window；
Step 7, with time of normal data as x-axis, the time of detection data is y-axis, by optimum regular path at rectangular coordinate
System shows；If detection data are normal, then it is shown as approximating 45 on t-t figureoStraight line, if detection data exception,
Excellent regular path there will be significantly skew at t-t figure, on the upper side represents that detection data have a hysteresis, on the lower side indicates advanced argument,
When the part vertical with transverse axis occurs, then it represents that unnecessary break occurs；Type according to optimum regular path offset and time
Carve the fault type with regard to deducibility divide-shut brake coil.
The regular path of described optimum is mostly distributed in accumulative cost matrix (1,1) and arrives (m, n) diagonal both sides, Sakoe-
Chiba window arranges border as shown in Figure 2 in these diagonal both sides；Edge-restraint condition is
,
WhereinhBe restrained boundary in y-direction from cornerwise height, be also that restrained boundary is in the x direction from cornerwise width
Degree；When border width is set to 10,hParametric equation can refer to following formula
。
Use having the beneficial effect that of as above technical scheme acquirement
The constraints of Sakoe-Chiba window is applied in traditional dynamic time warping algorithm by the present invention, not only avoid
Mistake between two groups of data is regular, and decreases unnecessary amount of calculation；
The present invention uses the dynamic time warping algorithm of improvement that detection data are carried out fault diagnosis, and this algorithm calculates process letter
Single, result of calculation shows more accurately, intuitively in the way of t-t figure.
Accompanying drawing explanation
Fig. 1 is that the method for diagnosing faults of the present invention a kind of circuit-breaker switching on-off coil realizes block diagram.
Fig. 2 is Sakoe-Chiba window.
Fig. 3 is 4 kinds of example waveform of breaker open operation coil current.
Fig. 4 is the diagnostic result of normal waveform 2.
Fig. 5 is the diagnostic result of fault waveform 1.
Fig. 6 is the diagnostic result of fault waveform 2.
Detailed description of the invention
The present invention will be further described with examples of implementation below in conjunction with the accompanying drawings.
The method is electric at normal condition action time-division, closing coil firstly the need of setting up chopper before carrying out fault diagnosis
The data base of stream, mates with normal data with data to be tested./ the inspection of the electric current of closing coil is divided collecting chopper
After surveying data, from data base, take one group of normal data R and detect data T one calculating group of composition:
Calculate the Euclidean distance between detection data and each element of normal data, generate cost matrix C, i.e.
。
Then, the accumulative cost function of structure, calculate two groups of data in various regular pathsq's
Accumulative regular distance.The regular path of optimum of two groups of dataq * Choose some when accumulative cost function takes minima to form.For
The element of accumulative cost matrix the first row passes through formula
It is calculated；Element for accumulative cost matrix first row passes through formula
It is calculated；Other elements in addition to the first row and first row pass through formula
It is calculated.The normal data of detection data and lane database is compared successively, take calculating arrive last point (m,
N) one group of normal data that time, cumulative distance is minimum, then detection data are maximum with the matching degree of this group normal data.
Finally, calculate and the principle of reverse optimizing according to forward, from point (1,1) to point (m, n) calculates accumulative cost matrix,
In the accumulative cost matrix of Optimum Matching, from point, (m n) finds optimum regular path to point (1,1).And with normal data time
Between be x-axis, with detect data time as y-axis, set up the rectangular coordinate system of t-t figure, by optimum regular path at rectangular coordinate
System shows.If detection data are normal, then it is shown as approximating 45 on t-t figureoStraight line, if detection data exception,
Excellent regular path there will be significantly skew at t-t figure, on the upper side represents that detection data have a hysteresis, on the lower side indicates advanced argument,
When the part vertical with transverse axis occurs, then it represents that unnecessary break occurs.It is delayed or the most normal according to detection data
Moment of data and appearance is it may determine that the fault type of circuit-breaker switching on-off coil.
Fig. 3 is the switching winding current waveform of actual measurement ZN63A (VS1) type 12kV indoor high-voltage vacuum circuit breaker, is respectively
Normal waveform 1, normal waveform 2, fault waveform 1 and fault waveform 2, its time span is equal is 46ms.Wherein fault waveform 1
It is switching winding iron core motion Block failure and the waveform of the elongated fault of motion idle stroke unshakable in one's determination respectively with fault waveform 2, below
With normal waveform 1 as reference data, use the method for diagnosing faults of circuit-breaker switching on-off coil of the present invention respectively by positive ordinary wave
Shape 2, fault waveform 1 and fault waveform 2 carry out fault diagnosis with normal waveform 1, and diagnostic result is as shown in Figure 4, Figure 5 and Figure 6.
Fig. 4 is the diagnostic result of normal waveform 2 and normal waveform 1, it is seen that its optimum regular path curve is basic with 45o's
Diagonal overlaps, and illustrates that detecting data mates with normal data, and breaker open operation coil working is normal.
Fig. 5 is the diagnostic result of fault waveform 1 and normal waveform 1.In the time of about 13ms to 19ms, fault waveform
1 relative normal waveform 1 occurs the most advanced, the most essentially identical.There is clamping stagnation for iron core motion in its reason, causes separating brake line
Loop current raised in the time of clamping stagnation unshakable in one's determination, and clamping stagnation terminates after current and returns normally.From diagnostic result it can be inferred that chopper
There is Block failure unshakable in one's determination in divide-shut brake coil.
Fig. 6 is the diagnostic result of fault waveform 2 and normal waveform 1.In the time of about 20ms to 26ms, fault waveform
There is obvious hysteresis in 2 relative normal waveform 1, also occur bright in the time of about 39ms to 46ms relative to normal waveform 1
Aobvious is delayed.Its reason is time of increasing in idle stroke of switching winding electric current after the idle stroke extending the motion of switching winding iron core
In continue to reduce, then clash into separating brake at iron core and take off mouthpart after current and raise again, cause the time failure that 20ms to 26ms occurs
Normal current after current hysteresis.Opening time is elongated, and the time that switching winding electric current is cut off is delayed.Switching winding electric current in Fig. 6
Waveform is compared normal current and is had more a little crest finally, and this little crest is shown as figure by the dynamic time warping algorithm of improvement
In the time of 6 inner 39ms to 46ms, about 7ms's is delayed.
The fault diagnosis of a kind of circuit-breaker switching on-off coil of the present invention can be drawn by the analysis of above case study on implementation
Method can be with the fault of Accurate Diagnosis circuit-breaker switching on-off coil, and diagnostic result is more directly perceived.
Claims (2)
1. the method for diagnosing faults of a circuit-breaker switching on-off coil, it is characterised in that include following several step:
Step 1, switching winding, the current data of closing coil when gathering chopper action in normal state, by these data
Composition data base；
Step 2, using the current data that detects as testing time sequence T,, a length of m, take one group
Normal data is as reference time array R, , a length of n, two time series one calculating of composition
Group；
Step 3, calculates the Euclidean distance between testing time sequence and each element of normal time sequence, generates cost matrix, the computing formula of each element of cost matrix is as follows:
；
Step 4, finds a paths to make the cumulative distance between two groups of data elements the shortest, to reach two groups from cost matrix
The optimal coupling of data, accumulative cost function of structure for this:
,
Wherein Q is the number in all regular paths,；And path during accumulative cost function acquirement minima is detected exactly
DataTWith normal dataRBetween the regular path of optimumq * , i.e.
；
Use the constraints of Sakoe-Chiba window, calculate the element of accumulative cost matrix the first row
,
Calculate the element of accumulative cost matrix first row
,
Calculate other elements in addition to the first row and first row
；
Step 5, compares successively by the normal data of detection data with lane database, takes calculating to last point accumulative generation
One group of valency distance minimum as Optimum Matching；
Step 6, calculates and the principle of reverse optimizing according to forward, from point (1,1) to point (m, n) calculates accumulative cost matrix,
In the accumulative cost matrix of Optimum Matching, from point, (m n) finds optimum regular path to point (1,1), finds optimum regular path
Mode is searched by reverse Sakoe-Chiba window；
Step 7, with time of normal data as x-axis, detection data time is y-axis, by optimum regular path in rectangular coordinate system
In show.
The method for diagnosing faults of a kind of circuit-breaker switching on-off coil the most as claimed in claim 1, it is characterised in that if detection number
According to normally, then it is shown as approximating 45 on t-t figureoStraight line, if detection data exception, optimum regular path can go out at t-t figure
The most significantly offset, on the upper side represent that detection data have a hysteresis, on the lower side indicate advanced argument, when the part vertical with transverse axis occurs
Time, then it represents that unnecessary electric current break occurs, according to type and the moment deducibility chopper deciliter of optimum regular path offset
There is which kind of fault in brake cable circle.
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Cited By (5)
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| CN108414896A (en) * | 2018-06-04 | 2018-08-17 | 西南交通大学 | A kind of electric network failure diagnosis method |
| CN110221119A (en) * | 2019-06-25 | 2019-09-10 | 广东石油化工学院 | Load switch event detecting method and system based on power Yu akie fuse information |
| CN111583064A (en) * | 2020-05-11 | 2020-08-25 | 国网四川省电力公司电力科学研究院 | Load production time interval detection method based on dynamic time warping and storage medium |
| CN115905886A (en) * | 2023-01-09 | 2023-04-04 | 北京和利时***集成有限公司 | Fault diagnosis method and device for platform screen door and storage medium |
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| CN111583064A (en) * | 2020-05-11 | 2020-08-25 | 国网四川省电力公司电力科学研究院 | Load production time interval detection method based on dynamic time warping and storage medium |
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| CN115905886A (en) * | 2023-01-09 | 2023-04-04 | 北京和利时***集成有限公司 | Fault diagnosis method and device for platform screen door and storage medium |
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