CN109507579A - Load ratio bridging switch changeover program on-line checking diagnostic method - Google Patents
Load ratio bridging switch changeover program on-line checking diagnostic method Download PDFInfo
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- CN109507579A CN109507579A CN201811480245.3A CN201811480245A CN109507579A CN 109507579 A CN109507579 A CN 109507579A CN 201811480245 A CN201811480245 A CN 201811480245A CN 109507579 A CN109507579 A CN 109507579A
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- China
- Prior art keywords
- changeover program
- load ratio
- bridging switch
- ratio bridging
- line
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Classifications
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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
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
-
- 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
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The present invention provides a kind of load ratio bridging switch changeover program on-line checking diagnostic method, include the following steps: to measure original on-line vibration data；The envelope curve of the original on-line vibration data is calculated, and the envelope curve is defined as to the original fingerprint of load ratio bridging switch vibration；Calculate the original fingerprint changeover program feature vector, X；Measure on-line vibration data to be diagnosed；The envelope curve of the on-line vibration data to be diagnosed is calculated, and the envelope curve is defined as to the follow-up severed finger line of load ratio bridging switch vibration；Calculate the follow-up severed finger line changeover program feature vector Y；Calculate related coefficient A；According to the related coefficient A and diagnosis criterion, judge load ratio bridging switch changeover program with the presence or absence of abnormal.Load ratio bridging switch changeover program on-line checking diagnostic method provided by the invention, realizes the purpose of on-line checking.
Description
Technical field
The present invention relates to electrical testing technical fields, especially load ratio bridging switch changeover program on-line checking diagnosis side
Method.
Background technique
OLTC (On Load Tap Changer, load ratio bridging switch) is that extra-high voltage direct-current transmission is essential important
Equipment, major function are to be operated by pressure regulation in the case where not interrupt load electric current and maintain converter valve DC voltage permanent
Fixed and compensation AC system voltage change, is maintained at optimum operation range for the Trigger Angle of converter valve, avoids making because of voltage fluctuation
It is latched at commutation failure even direct current.By taking ± 800kV two-terminal direct current transmission system as an example, averagely there are 48 to be installed on daily and change
OLTC inside rheology executes more than 500 pressure regulation operations, acts frequently, and effect is great, and OLTC reliability service supplies electric system
Electric safety is most important.
Switching switch is the core of OLTC, and whether each contact changeover program is correctly to OLTC operational safety in handoff procedure
It plays a decisive role, and fastener loosening, spring breakage, contact are bad etc. abnormal will have a direct impact to handoff procedure.
It is accurate and reliable that OLTC failure is diagnosed by detection switching sequence.Direct current detection method is switching sequence detection method generally acknowledged at present,
Have become OLTC type approval test, delivery test and overhaul test must examine item.Direct current detection method need to dismantle OLTC when testing, only
It can carry out offline.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of load ratio bridging switch changeover program on-line checking diagnostic method,
Time-series rules can be switched over online.
The present invention provides a kind of load ratio bridging switch changeover program on-line checking diagnostic methods, include the following steps:
1) after transformer puts into operation, under operation, vibration data when load ratio bridging switch movement is measured, and should
Data definition is original on-line vibration data；
2) envelope curve of the original on-line vibration data is calculated, and the envelope curve is defined as load ratio bridging switch
The original fingerprint of vibration；
3) the original fingerprint changeover program feature vector, X is calculated；
4) when transformer station high-voltage side bus needs to diagnose for a period of time load ratio bridging switch changeover program with the presence or absence of exception afterwards, becoming
Under depressor operating status, under test condition identical with step 1), vibration data when load ratio bridging switch movement is measured, and
It is on-line vibration data to be diagnosed by the data definition；
5) envelope curve of the on-line vibration data to be diagnosed is calculated, and the envelope curve is defined as loaded tap-off and is opened
Close the follow-up severed finger line of vibration；
6) the follow-up severed finger line changeover program feature vector Y is calculated；
7) the original fingerprint changeover program feature vector, X and the follow-up severed finger line changeover program feature vector Y are calculated
Related coefficient A；
8) according to the related coefficient A and diagnosis criterion, judge load ratio bridging switch changeover program with the presence or absence of abnormal.
Further, in the step 3), the original fingerprint changeover program feature vector, X is vibrated by load ratio bridging switch
The zero pole point time coordinate value of original fingerprint feature wave crest is constituted；In the step 6), the follow-up severed finger line changeover program is special
Sign vector Y is made of the zero pole point time coordinate value of load ratio bridging switch vibration follow-up severed finger line feature wave crest.
Further, in the step 3), the original fingerprint changeover program feature vector, X=(x1, x2, x3, x4, x5,
X6), wherein x2 is the corresponding time coordinate value of first wave crest pole, and x5 is to sit the amplitude maximum wave crest pole corresponding time
Scale value, x1 are the corresponding time coordinate value of previous zero point of first wave crest pole, and x3 is the latter of first wave crest pole
The corresponding time coordinate value of a zero point, x4 are the corresponding time coordinate value of previous zero point of amplitude maximum wave crest pole, and x6 is
The corresponding time coordinate value of the latter zero point of amplitude maximum wave crest pole；In the step 6), the follow-up severed finger line switching
Performance of program vector Y=(y1, y2, y3, y4, y5, y6), wherein y2 is the corresponding time coordinate value of first wave crest pole, y5
For the corresponding time coordinate value of amplitude maximum wave crest pole, y1 is to sit the previous zero point corresponding time of first wave crest pole
Scale value, y3 are the corresponding time coordinate value of the latter zero point of first wave crest pole, and y4 is before amplitude maximum wave crest pole
The corresponding time coordinate value of one zero point, y6 are the corresponding time coordinate value of the latter zero point of amplitude maximum wave crest pole.
Further, in the step 7), the calculation method of the related coefficient A is as follows:
Wherein, LRxyFor the original fingerprint changeover program feature vector, X and the follow-up severed finger line changeover program feature to
Measure the normalized covariance of Y.
Further, in the step 8), the diagnosis criterion are as follows:
If A >=2, then load ratio bridging switch changeover program is normal；
If 2 > A >=1, then there are slight abnormalities for load ratio bridging switch changeover program；
If A < 1, then there are severely subnormals for load ratio bridging switch changeover program.
Load ratio bridging switch changeover program on-line checking diagnostic method provided by the invention, original on-line vibration data and to
On-line vibration data are diagnosed compared to pair, related coefficient A is obtained, determines according to related coefficient A as a result, realizing the mesh of on-line checking
's.Due to using transformer OLTC changeover program and OLTC on-line vibration data envelopment curvilinear characteristic wave crest (first wave crest and
Amplitude maximum wave crest) sequential correlation characteristic, when changeover program is normal, OLTC on-line vibration data envelopment curvilinear characteristic wave crest
Time interval is essentially identical, and when changeover program exception, the time interval of OLTC on-line vibration data envelopment curvilinear characteristic wave crest becomes
Change larger, feature wave crest can be used as judge the whether correct effective parameter of load ratio bridging switch changeover program online.It uses
The related coefficient of OLTC on-line vibration data envelopment curvilinear characteristic vector judges load ratio bridging switch changeover program shape as online
The criterion of state, have live strong operability, need not powers failure, accuracy of judgement, be quick on the draw, can quantify to judge, is easy to implement etc.
Advantage.The present invention can be widely applied in Faults of On-Load Tap-changer in Transformer inline diagnosis.
Detailed description of the invention
Fig. 1 is the flow chart of load ratio bridging switch changeover program on-line checking diagnostic method of the present invention；
Fig. 2 is the schematic diagram of the envelope curve of original on-line vibration data of the invention；
Fig. 3 is the envelope curve schematic diagram of on-line vibration data to be diagnosed of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The present invention provides a kind of load ratio bridging switch changeover program on-line checking diagnostic methods, and the present invention is according to OLTC
The feature wave crest of on-line vibration data envelopment curve judges whether load ratio bridging switch changeover program state is normal online, switches journey
When sequence is normal, the time interval of OLTC on-line vibration data envelopment curvilinear characteristic wave crest is essentially identical, when changeover program exception,
The time interval of OLTC on-line vibration data envelopment curvilinear characteristic wave crest changes greatly, therefore the present invention is based on OLTC on-line vibrations
The changeover program on-line checking diagnostic method of data envelopment curvilinear characteristic wave crest is, according to the on-line vibration measured under the same terms
Data calculate the envelope curve of original on-line vibration data and the envelope curve of on-line vibration data to be diagnosed, and have obtained carrying and divide
Connect switch vibration original fingerprint and load ratio bridging switch vibration follow-up severed finger line, then calculate original fingerprint changeover program feature to
Amount and follow-up severed finger line changeover program feature vector calculate the related coefficient of two feature vectors, right according to the size of related coefficient
According to diagnosis criterion, judge load ratio bridging switch changeover program with the presence or absence of abnormal.Specifically, as shown in Figure 1, including following step
It is rapid:
1) after transformer puts into operation, under operation, vibration data when load ratio bridging switch movement is measured, and should
Data definition is original on-line vibration data；
2) envelope curve of the original on-line vibration data is calculated, and the envelope curve is defined as load ratio bridging switch
The original fingerprint of vibration；
The calculation method of envelope curve are as follows:
S (n)=x2(n) (3000) w, (1)
Wherein, S (n) is envelope curve data, and x (n) is the data sequence of original on-line vibration data, and w (3000) is window
A length of 3000 Hamming window sequence；
3) the original fingerprint changeover program feature vector, X is calculated；
X=(x1, x2, x3, x4, x5, x6), as shown in Fig. 2, the method for calculating original fingerprint changeover program feature vector, X
It is:
X2 is the corresponding time coordinate value of first wave crest pole；
X5 is the corresponding time coordinate value of amplitude maximum wave crest pole；
X1 is the corresponding time coordinate value of previous zero point of first wave crest pole；
X3 is the corresponding time coordinate value of the latter zero point of first wave crest pole；
X4 is the corresponding time coordinate value of previous zero point of amplitude maximum wave crest pole；
X6 is the corresponding time coordinate value of the latter zero point of amplitude maximum wave crest pole；
4) when transformer station high-voltage side bus needs to diagnose for a period of time load ratio bridging switch changeover program with the presence or absence of exception afterwards, becoming
Under depressor operating status, under test condition identical with step 1), vibration data when load ratio bridging switch movement is measured, and
It is on-line vibration data to be diagnosed by the data definition；
5) envelope curve of the on-line vibration data to be diagnosed is calculated, and the envelope curve is defined as loaded tap-off and is opened
The follow-up severed finger line of vibration is closed, wherein the calculation method of envelope curve is identical as step 2), and details are not described herein again；
6) the follow-up severed finger line changeover program feature vector Y is calculated；
Calculate follow-up severed finger line changeover program feature vector Y=(y1, y2, y3, y4, y5, y6), as shown in figure 3, calculate to
The method of diagnosis fingerprint changeover program feature vector Y is:
Y2 is the corresponding time coordinate value of first wave crest pole；
Y5 is the corresponding time coordinate value of amplitude maximum wave crest pole；
Y1 is the corresponding time coordinate value of previous zero point of first wave crest pole；
Y3 is the corresponding time coordinate value of the latter zero point of first wave crest pole；
Y4 is the corresponding time coordinate value of previous zero point of amplitude maximum wave crest pole；
Y6 is the corresponding time coordinate value of the latter zero point of amplitude maximum wave crest pole；
7) the original fingerprint changeover program feature vector, X and the follow-up severed finger line changeover program feature vector Y are calculated
Related coefficient A；
Specifically, the calculation method of related coefficient A are as follows:
Calculate the standard variance D of original fingerprint changeover program feature vector, XxWith follow-up severed finger line changeover program feature vector
The standard variance D of Yy:
Wherein, N is characterized the length of vector data sequence, and value N=6, X (k) are original fingerprint changeover program feature
The kth element of vector X, Y (k) are the kth element of follow-up severed finger line changeover program feature vector Y；
Calculate the covariance C of original fingerprint changeover program feature vector, X and follow-up severed finger line changeover program feature vector Yxy:
Calculate original fingerprint changeover program feature vector, X and the normalization association of follow-up severed finger line changeover program feature vector Y
Variance LRxy:
Calculate related coefficient A:
8) according to the related coefficient A and diagnosis criterion, it is abnormal to judge that load ratio bridging switch changeover program whether there is,
Wherein, the diagnosis criterion are as follows:
If A >=2, then load ratio bridging switch changeover program is normal；
If 2 > A >=1, then there are slight abnormalities for load ratio bridging switch changeover program；
If A < 1, then there are severely subnormals for load ratio bridging switch changeover program.
The scope of protection of the present invention is not limited to this.Those skilled in the art are made equivalent on the basis of the present invention
Substitution or transformation, it is within the scope of the present invention.Protection scope of the present invention is subject to claims.
Claims (5)
1. a kind of load ratio bridging switch changeover program on-line checking diagnostic method, which comprises the steps of:
1) after transformer puts into operation, under operation, vibration data when load ratio bridging switch movement is measured, and by the data
It is defined as original on-line vibration data；
2) envelope curve of the original on-line vibration data is calculated, and the envelope curve is defined as load ratio bridging switch vibration
Original fingerprint；
3) the original fingerprint changeover program feature vector, X is calculated；
4) when transformer station high-voltage side bus needs to diagnose for a period of time load ratio bridging switch changeover program with the presence or absence of exception afterwards, in transformer
Under operating status, under test condition identical with step 1), vibration data when load ratio bridging switch movement is measured, and should
Data definition is on-line vibration data to be diagnosed；
5) envelope curve of the on-line vibration data to be diagnosed is calculated, and the envelope curve is defined as load ratio bridging switch vibration
Dynamic follow-up severed finger line；
6) the follow-up severed finger line changeover program feature vector Y is calculated；
7) phase of the original fingerprint changeover program feature vector, X and the follow-up severed finger line changeover program feature vector Y is calculated
Relationship number A；
8) according to the related coefficient A and diagnosis criterion, judge load ratio bridging switch changeover program with the presence or absence of abnormal.
2. load ratio bridging switch changeover program on-line checking diagnostic method as described in claim 1, which is characterized in that the step
It is rapid 3) in, the original fingerprint changeover program feature vector, X by the original fingerprint feature wave crest zero pole point time coordinate value
It constitutes；In the step 6), the follow-up severed finger line changeover program feature vector Y is by the zero of the follow-up severed finger line feature wave crest
Pole time coordinate value is constituted.
3. load ratio bridging switch changeover program on-line checking diagnostic method as claimed in claim 2, which is characterized in that the step
It is rapid 3) in, original fingerprint changeover program feature vector, X=(x1, x2, x3, x4, x5, the x6), wherein x2 be first wave crest
The corresponding time coordinate value of pole, x5 are the corresponding time coordinate value of amplitude maximum wave crest pole, and x1 is first wave crest pole
The corresponding time coordinate value of previous zero point, x3 be first wave crest pole the corresponding time coordinate value of the latter zero point,
X4 is the corresponding time coordinate value of previous zero point of amplitude maximum wave crest pole, and x6 is the latter of amplitude maximum wave crest pole
The corresponding time coordinate value of zero point；In the step 6), the follow-up severed finger line changeover program feature vector Y=(y1, y2, y3,
Y4, y5, y6), wherein y2 is the corresponding time coordinate value of first wave crest pole, and y5 is that amplitude maximum wave crest pole is corresponding
Time coordinate value, y1 are the corresponding time coordinate value of previous zero point of first wave crest pole, and y3 is first wave crest pole
The corresponding time coordinate value of the latter zero point, y4 be amplitude maximum wave crest pole the corresponding time coordinate of previous zero point
Value, y6 are the corresponding time coordinate value of the latter zero point of amplitude maximum wave crest pole.
4. load ratio bridging switch changeover program on-line checking diagnostic method as described in claim 1, which is characterized in that the step
It is rapid 7) in, the calculation method of the related coefficient A is as follows:
Wherein, LRxyFor the original fingerprint changeover program feature vector, X and the follow-up severed finger line changeover program feature vector Y
Normalized covariance.
5. load ratio bridging switch changeover program on-line checking diagnostic method as described in claim 1, which is characterized in that the step
It is rapid 8) in, the diagnosis criterion are as follows:
If A >=2, then load ratio bridging switch changeover program is normal；
If 2 > A >=1, then there are slight abnormalities for load ratio bridging switch changeover program；
If A < 1, then there are severely subnormals for load ratio bridging switch changeover program.
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| CN201811480245.3A CN109507579B (en) | 2018-12-05 | 2018-12-05 | On-load tap-changer switching program on-line detection and diagnosis method |
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Cited By (1)
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| CN112444577A (en) * | 2020-11-17 | 2021-03-05 | 广东电网有限责任公司电力科学研究院 | Method and system for evaluating switching state of vacuum on-load tap-changer |
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