CN107576259A - Deformation of transformer winding online test method based on very fast transient overvoltage characteristic - Google Patents
Deformation of transformer winding online test method based on very fast transient overvoltage characteristic Download PDFInfo
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- CN107576259A CN107576259A CN201610517634.3A CN201610517634A CN107576259A CN 107576259 A CN107576259 A CN 107576259A CN 201610517634 A CN201610517634 A CN 201610517634A CN 107576259 A CN107576259 A CN 107576259A
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Abstract
The present invention relates to a kind of deformation of transformer winding online test method based on very fast transient overvoltage characteristic, comprise the steps of：Transformer Winding to be detected is selected, when there is very fast transient overvoltage impact, the very fast transient overvoltage signal of input and the voltage responsive signal of winding ends are measured using data acquisition device；The transmission function of winding to be detected is calculated using the data measured；Frequency response curve is drawn using the transfer function data and its transfer function data when normal of winding to be detected；The coefficient correlation of two curves is calculated using obtained curve data, and then judges the deformation of winding.Energy on-line checking deformation of transformer winding of the invention, improve the real-time of deformation of transformer winding diagnosis.
Description
Technical field
The present invention relates to technical field of electric power detection, more particularly to a kind of transformation based on very fast transient overvoltage characteristic
Device winding deformation online test method.
Background technology
Transformer is one of capital equipment of power system, and voltage class conversion, energy distribution are played in power system
Etc. important function, its reliability directly affects the normal operation of power system.The factually incomplete statistics of border operational data, there are about
25% transformer fault is caused by winding deformation.The degree of accuracy and the reliability of winding deformation diagnostic method are improved, for subtracting
Few transformer fault is significant.
Frequency response method is one of winding deformation detection method generally used, in actually detected, repeatedly between measurement
Error is small, and simple to operate, but it is off-line checking method, and transformer state when testing that has a power failure with not being inconsistent in operation, influences
Measurement and judgement.And on-line checking is that it is detected and diagnosed when transformer is in running status, with offline inspection phase
Than, winding deformation can be found in time, improve authenticity and the sensitivity of diagnosis, and on-line checking can accumulate mass data, it is comprehensive
The current data and historical data of analysis transformer are closed, in time, analysis judgement is comprehensively carried out, reduces the mistake inspected periodically and brought
Difference.
In GIS, operating breaker, disconnecting switch etc. can produce a voltage steep wave inside GIS, and the steep wave is through multiple
Reflect and reflect to form that wave head is extremely steep, frequency is up to tens megahertzs even up to a hundred megahertzs of very fast transient overvoltage.When
When transformer is directly connected by sleeve pipe with GIS, caused very fast transient overvoltage will enter transformer, pass in the windings
Broadcast.The characteristics of from very fast transient overvoltage, its wave head time is extremely short, or even is smaller than 10ns, and highest frequency reaches million
Hertz, thus can be separated completely with fundamental frequency signal.And the rising edge amplitude height that very fast transient overvoltage is precipitous, and containing big
The radio-frequency component of amount, Transformer Winding now are the passive system under a high frequency, should make full use of very fast transient mistake
Voltage signal, realize the on-line checking to deformation of transformer winding.
The content of the invention
It is an object of the present invention to provide a kind of deformation of transformer winding based on very fast transient overvoltage characteristic is online
Detection method, using the very fast transient overvoltage signal of on-line measurement, by frequency response method principle, using correlation coefficient process
Judge winding deformation situation.
The technical scheme is that the deformation of transformer winding on-line checking side based on very fast transient overvoltage characteristic
Method, specifically comprise the steps of：
Step 1：Transformer Winding to be detected is selected, when there is very fast transient overvoltage impact, utilizes data acquisition
The very fast transient overvoltage signal U of measurement device input1(f) and winding ends voltage responsive signal U2(f)。
Step 2：Voltage signal for gathering acquisition in above-mentioned steps 1, according to formula H (f)=20log [U2(f)/U1
(f)] handled, obtain the transmission function of winding to be detected in step 1.In formula, H (f) is the mould of transmission function when frequency is f
Value, U2(f)、U1(f) it is the virtual value of responder and input terminal voltage when frequency is f.
Step 3：For the H (f) being calculated in step 2, frequency response curve is drawn, wherein abscissa is frequency f, ordinate
For the modulus value H (f) of corresponding transmission function.Similarly, frequency response curve of Transformer Winding when normal is plotted in same coordinate
Under system.
Step 4：For the curve data obtained in step 3, winding deformation situation is judged using correlation coefficient process.
In the step 4, specifically comprise the steps of：
Step 41：For the curve data obtained in step 3, it is assumed that its amplitude sequence X (i) for being N for two length, Y
(i), i=0,1 ... ..., N-1, and X (i), Y (i) they are real number.The standard variance of two sequences is calculated, wherein
Step 42：For two amplitude sequences in step 41, the covariance of two sequences of calculating
Step 43：For two amplitude sequences in step 41, using in the standard variance and step 42 in step 41
Covariance, the covariance of two sequences is done into normalized
Step 44：For the covariance LR after being normalized in step 43xyIf 1-LRxy＜ 10-10, then coefficient RxyFor
10；If 1-LRxy≥10-10, then coefficient Rxy=-1g (1-LRxy)。
Step 45：For the coefficient R of step 44xyIf Rxy＜ 0.6, then judge that Transformer Winding is gross distortion；
If 0.6≤Rxy＜ 1, then judge Transformer Winding for obvious deformation；If Rxy>=1, then winding is normal.
Deformation of transformer winding online test method provided by the present invention based on very fast transient overvoltage characteristic, profit
With the very fast transient overvoltage signal of on-line measurement, the on-line checking to deformation of transformer winding is realized, improves transformation
The real-time that device winding judges.
Brief description of the drawings
Fig. 1 is the deformation of transformer winding online test method of the present invention based on very fast transient overvoltage characteristic
Flow chart；
Fig. 2 is the flow chart of the calculating frequency response curve coefficient correlation method described in step 4 of the present invention.
Embodiment
Below according to Fig. 1~Fig. 2, presently preferred embodiments of the present invention is illustrated.It is emphasized that the description below is only
It is exemplary, the scope being not intended to be limiting of the invention and its application.
As shown in figure 1, the deformation of transformer winding provided by the present invention based on very fast transient overvoltage characteristic is online
Detection method, specifically comprise the steps of.
Step 1：Transformer Winding to be detected is selected, when there is very fast transient overvoltage impact, utilizes data acquisition
The very fast transient overvoltage signal U of measurement device input1(f) and winding ends voltage responsive signal U2(f)。
Step 2：Voltage signal for gathering acquisition in above-mentioned steps 1, according to formula H (f)=20log [U2(f)/U1
(f)] handled, obtain the transmission function of winding to be detected in step 1.In formula, H (f) is the mould of transmission function when frequency is f
Value, U2(f)、U1(f) it is the virtual value of responder and input terminal voltage when frequency is f.
Step 3：For the H (f) being calculated in step 2, frequency response curve is drawn, wherein abscissa is frequency f, ordinate
For the modulus value H (f) of corresponding transmission function.Similarly, frequency response curve of Transformer Winding when normal is plotted in same coordinate
Under system.
Step 4：For the curve data obtained in step 3, winding deformation situation is judged using correlation coefficient process.Such as Fig. 2
It is shown, specifically include the following steps.
Step 41：For the curve data obtained in step 3, it is assumed that its amplitude sequence X (i) for being N for two length, Y
(i), i=0,1 ... ..., N-1, and X (i), Y (i) they are real number.The standard variance of two sequences is calculated, wherein
Step 42：For two amplitude sequences in step 41, the covariance of two sequences of calculating
Step 43：For two amplitude sequences in step 41, using in the standard variance and step 42 in step 41
Covariance, the covariance of two sequences is done into normalized
Step 44：For the covariance LR after being normalized in step 43xyIf 1-LRxy＜ 10-10, then coefficient RxyFor
10；If 1-LRxy≥10-10, then coefficient Rxy=-1g (1-LRxy)。
Step 45：For the coefficient R of step 44xyIf Rxy＜ 0.6, then judge that Transformer Winding is gross distortion；
If 0.6≤Rxy＜ 1, then judge Transformer Winding for obvious deformation；If Rxy>=1, then winding is normal.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (1)
1. the deformation of transformer winding online test method based on very fast transient overvoltage characteristic, it is characterised in that the side
Method comprises the steps of：
Step 1：Transformer Winding to be detected is selected, when there is very fast transient overvoltage impact, utilizes data acquisition device
Measure the very fast transient overvoltage signal U of input1(f) and winding ends voltage responsive signal U2(f)。
Step 2：Voltage signal for gathering acquisition in above-mentioned steps 1, according to formula H (f)=20log [U2(f)/U1(f)] enter
Row processing, obtains the transmission function of winding to be detected in step 1.In formula, H (f) is the modulus value of transmission function when frequency is f, U2
(f)、U1(f) it is the virtual value of responder and input terminal voltage when frequency is f.
Step 3：For the H (f) being calculated in step 2, frequency response curve is drawn, wherein abscissa is frequency f, and ordinate is pair
The modulus value H (f) for the transmission function answered.Similarly, frequency response curve of Transformer Winding when normal is plotted under same coordinate system.
Step 4：For the curve data obtained in step 3, winding deformation situation is judged using correlation coefficient process.
Priority Applications (1)
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|---|---|---|---|
| CN201610517634.3A CN107576259A (en) | 2016-07-05 | 2016-07-05 | Deformation of transformer winding online test method based on very fast transient overvoltage characteristic |
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| CN201610517634.3A CN107576259A (en) | 2016-07-05 | 2016-07-05 | Deformation of transformer winding online test method based on very fast transient overvoltage characteristic |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267660A (en) * | 2018-03-21 | 2018-07-10 | 广东电网有限责任公司电力科学研究院 | A kind of Diagnosis Method of Transformer Faults and device |
| CN113739730A (en) * | 2021-08-30 | 2021-12-03 | 西安交通大学 | Transient acoustic signal-based transformer winding deformation detection method and system |
-
2016
- 2016-07-05 CN CN201610517634.3A patent/CN107576259A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267660A (en) * | 2018-03-21 | 2018-07-10 | 广东电网有限责任公司电力科学研究院 | A kind of Diagnosis Method of Transformer Faults and device |
| CN108267660B (en) * | 2018-03-21 | 2020-02-14 | 广东电网有限责任公司电力科学研究院 | Transformer fault diagnosis method and device |
| CN113739730A (en) * | 2021-08-30 | 2021-12-03 | 西安交通大学 | Transient acoustic signal-based transformer winding deformation detection method and system |
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Application publication date: 20180112 |