CN105136440B - The diagnostic method that a kind of Winding in Power Transformer based on load condition loosens - Google Patents
The diagnostic method that a kind of Winding in Power Transformer based on load condition loosens Download PDFInfo
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- CN105136440B CN105136440B CN201510528267.2A CN201510528267A CN105136440B CN 105136440 B CN105136440 B CN 105136440B CN 201510528267 A CN201510528267 A CN 201510528267A CN 105136440 B CN105136440 B CN 105136440B
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- 238000004804 winding Methods 0.000 title claims abstract description 36
- 238000002405 diagnostic procedure Methods 0.000 title claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000010606 normalization Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The present invention relates to the diagnostic method that a kind of Winding in Power Transformer based on load condition loosens, belong to power transformer safety monitoring technology field.This method performs following steps：1）Set sample frequency and sampling time；2）Measure the B phase low-pressure side electric currents of power transformer；3）Obtain the vibration signal of each vibrating sensor；4）Calculate first threshold and Second Threshold；5）Judge whether to have set first threshold and Second Threshold；6）The power transformer of load condition is monitored, and carries out loosening judgement；7）If being still that the First Eigenvalue is more than Second Threshold more than first threshold and Second Eigenvalue by the continuous 3 times results for judging to obtain, the winding of power transformer loosens；If not continuous 3 times judge to show that the First Eigenvalue is more than the result that first threshold and Second Eigenvalue are more than Second Threshold, then return to step 6）.This method carries out winding using the relation of fundamental frequency and its harmonic and loosens diagnosis, avoids the inadequate problem of precision.
Description
Technical field
The present invention relates to the diagnostic method that a kind of Winding in Power Transformer loosens, belong to power transformer safety monitoring technology
Field.
Background technology
Show from the domestic and international statistics about transformer, the loosening of winding deform be break down the reason for more it
One.For the transformer for having winding to loosen, when loosening does not jeopardize insulation, total hydrocarbon and each component content keep normal in oil, hang
Core inspection most simple, intuitive but to spend substantial amounts of human and material resources, financial resources.Therefore, it is necessary to seek the detection transformation of simplicity
The method that device winding loosens.
From the perspective of mechanical structure, the vibration on power transformer body surface and the compression situation of Transformer Winding are close
Cut is closed.Basket vibration caused by electromagnetic force can be delivered to tank surface by iron core, supporting bar and insulating oil, therefore
Whether can be loosened come detection winding by way of measuring and vibrating.Power Transformer Condition monitoring based on vibration signal
It is convenient that method is realized, monitoring system does not have electrical link with transformer, does not influence equipment normal operation.Prior art is to transformer
Vibration is studied, and analysis Transformer Winding, which loosens 100Hz components in deformation rear fuel tank vibration signal, to change, and with
Winding current it is square directly proportional.If the change only according to fundamental component diagnoses to be loosened to Transformer Winding, it is accurate
True property is not high, easily judges by accident.
The content of the invention
The technical problem to be solved in the present invention is, in view of the shortcomings of the prior art, proposing a kind of electric power based on load condition
The diagnostic method that Transformer Winding loosens.
The present invention is to solve the technical scheme that above-mentioned technical problem proposes to be：A kind of power transformer based on load condition
The diagnostic method that winding loosens, perform following steps：
1) setting is installed on the first vibrating sensor on the power transformer, the second vibrating sensor and the 3rd vibration and passed
The sample frequency of sensor and sampling time；
2) the B phase low-pressure side electric currents of the power transformer are measured；
3) each vibrating sensor is sampled according to the sample frequency and sampling time, obtains each vibrating sensor
Vibration signal；
4) first threshold and Second Threshold are obtained by the vibration signal and B phase low-pressure side electric currents；
5) judge whether to have set first threshold and Second Threshold, if not setting first threshold and Second Threshold, return
Step 1)；If having set first threshold and Second Threshold, into step 6)；
6) power transformer of load condition is monitored, obtains the power transformer in load operation conditions
Under the First Eigenvalue and Second Eigenvalue, and carry out loosening judgement.
If the First Eigenvalue is more than the first threshold and Second Eigenvalue is more than the Second Threshold, enter step
It is rapid 7)；
If the First Eigenvalue is less than the first threshold or the Second Eigenvalue is less than the Second Threshold, then
Secondary acquisition the First Eigenvalue and Second Eigenvalue, and re-start loosening and judge；
If 7) by judging that obtained results are still that the First Eigenvalue is more than first threshold and Second Eigenvalue is big for continuous 3 times
In the winding loosening of Second Threshold, the then power transformer；If not continuous 3 times judge to show that the First Eigenvalue is more than first
Threshold value and Second Eigenvalue are more than the result of Second Threshold, then return to step 6)；
The first threshold is multiplied by coefficient a and obtained by the first normalization amplitude, and the first normalization amplitude is described the
The 100Hz component amplitudes of two vibrating sensors divided by the B phases low-pressure side electric current perunit value square after be converted into the electricity again
The normalized value of the rated current of power transformer；
200Hz component amplitude and threeth vibrating sensor of the Second Threshold by the 3rd vibrating sensor
The ratio of 100Hz component amplitudes is multiplied by coefficient b and obtained；
The second normalization amplitude when the First Eigenvalue is the power transformer load operation conditions, described second
Normalize amplitude for the power transformer load operation conditions when the second vibrating sensor 100Hz component amplitudes divided by institute
State B phase low-pressure side electric current perunit values square after be converted into again the power transformer rated current normalized value；
The Second Eigenvalue is divided by the 200Hz of the 3rd vibrating sensor during the power transformer load operation conditions
Measure amplitude and the ratio of the 100Hz component amplitudes of the 3rd vibrating sensor；
The coefficient a is more than 1 and less than 3；The coefficient b is more than 1 and less than 2；
The improvement of above-mentioned technical proposal is：The coefficient a is 2.5, and the coefficient b is 1.2.
The improvement of above-mentioned technical proposal is：Step 3) carries out at least 3 times samplings to each vibrating sensor, and calculates and shake
The arithmetic average of each component amplitude in dynamic signal.If by 3 maximums and minimum value phase for sampling obtained vibration signal
Poor more than 50%, then re-start the collection of vibration signal；If below 50%, each component amplitude in vibration signal is calculated
Arithmetic average.
The beneficial effects of the invention are as follows：This method carries out winding using the relation of fundamental frequency and its harmonic and loosens diagnosis,
Diagnostic accuracy is improved, while has evaded the problem of next precision of harmonic signal totality smaller strip is inadequate, is utilized
100Hz, 200Hz component and its mutual relation judge that Transformer Winding loosens defect, due in transformer vibration signal,
100Hz and 200Hz component amplitudes are larger, thus it is not high to signal monitoring required precision, and winding current is also contemplated to shaking
The influence of dynamic signal amplitude, it can easily and accurately judge that Transformer Winding loosens defect.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the flow chart of the embodiment of the present invention.
Fig. 2 is the signal of the power transformer and the vibrating sensor being installed on power transformer in the embodiment of the present invention
Figure.
Fig. 3 is No. 2 o'clock rumble spectrums under 60% rated current when transformer A of embodiment of the present invention phase windings loosen
Figure.
Fig. 4 is No. 2 o'clock rumble spectrums under 100% rated current when transformer A of embodiment of the present invention phase windings loosen
Figure.
Fig. 5 is No. 2 o'clock rumble spectrums under 110% rated current when transformer A of embodiment of the present invention phase windings loosen
Figure.
Embodiment
Embodiment
The diagnostic method that a kind of Winding in Power Transformer based on load condition of the present embodiment loosens, performs following step
Suddenly：
1) setting is installed on the first vibrating sensor on power transformer, the second vibrating sensor (No. 2 points) and the 3rd shakes
The sample frequency of dynamic sensor (No. 3 points) and sampling time；
2) the B phase low-pressure side electric currents of power transformer are measured；
3) each vibrating sensor is sampled according to sample frequency and sampling time, obtains the vibration of each vibrating sensor
Signal；
4) first threshold and Second Threshold are obtained by vibration signal and B phase low-pressure side electric currents；
5) judge whether to have set first threshold and Second Threshold, if not setting first threshold and Second Threshold, return
Step 1)；If having set first threshold and Second Threshold, into step 6)；
6) power transformer of load condition is monitored, obtains first of power transformer under load operation conditions
Characteristic value and Second Eigenvalue, and carry out loosening judgement.
If the First Eigenvalue is more than first threshold and Second Eigenvalue is more than Second Threshold, into step 7)；
If the First Eigenvalue is less than first threshold or Second Eigenvalue is less than Second Threshold, the First Eigenvalue is obtained again
And Second Eigenvalue, and re-start loosening and judge；
If 7) by judging that obtained results are still that the First Eigenvalue is more than first threshold and Second Eigenvalue is big for continuous 3 times
In the winding loosening of Second Threshold, then power transformer；If not continuous 3 judgements show that the First Eigenvalue is more than first threshold
And Second Eigenvalue is more than the result of Second Threshold, then return to step 6)；
First threshold is multiplied by coefficient a by the first normalization amplitude and obtained, and the first normalization amplitude is the second vibrating sensor
The 100Hz component amplitudes of (No. 2 points) divided by B phase low-pressure side electric current perunit values square after be converted into the specified of power transformer again
The normalized value of electric current；
Second Threshold by the 3rd vibrating sensor (No. 3 points) 200Hz component amplitudes and the 3rd vibrating sensor (No. 3 points)
The ratio of 100Hz component amplitudes be multiplied by coefficient b and obtain；
The second normalization amplitude when the First Eigenvalue is power transformer load operation conditions, the second normalization amplitude are
100Hz component amplitudes divided by B phases the low-pressure side electricity of the second vibrating sensor (No. 2 points) during power transformer load operation conditions
Stream perunit value square after be converted into again power transformer rated current normalized value；
Second Eigenvalue was by 200Hz minutes of the 3rd vibrating sensor (No. 3 points) during power transformer load operation conditions
Measure amplitude and the ratio of the 100Hz component amplitudes of the 3rd vibrating sensor (No. 3 points)；
Coefficient a is more than 1 and less than 3；Coefficient b is more than 1 and less than 2；
The coefficient a of the present embodiment is 2.5, and coefficient b is 1.2.
The step 3) of the present embodiment carries out at least 3 times samplings to each vibrating sensor, and calculates each component of vibration signal
The arithmetic average of amplitude.If by 3 maximums for sampling obtained vibration signal and minimum value difference more than 50%, weigh
The new collection for carrying out vibration signal；If below 50%, the arithmetic average of each component amplitude of vibration signal is calculated.
In the present embodiment, the transformer monitored sets 3 vibrating sensings to hang bell-type power transformer, on its surface
Device, 3 vibrating sensors are firmly adsorbed on fuel tank upper surface by magnet, correspond to the axial direction of collection Three-Phase Transformer winding respectively
Vibration signal.As shown in Fig. 2 1~3 is the installation site of 3 vibrating sensors, A, B, C represent the high-pressure side of three-phase windings,
A, b, c represent the low-pressure side of three-phase windings, and 0 represents zero phase.
In order to verify the effect of the present invention, spy carries out following checking test.
One model SFZ10-31500/110 power transformer is tested according to above-mentioned steps.The electric power becomes
Depressor basic parameter is as shown in table 1.
Table 1
| Voltage ratio | Capacity | Joint group | Low-pressure side IN |
| 110/10.5kV | 31500kVA | YN,d11 | 1732A |
Processing and time-frequency conversion are filtered to the vibration signal collected by vibrating sensor, is obtained under different electric currents
Rumble spectrum figure, as in Figure 3-5.
Measure first normally without No. 2 point 100Hz normalization amplitudes and No. 3 point 200Hz and 100Hz under winding loosening state
Ratio, as shown in table 2.
Table 2
| Feature one | Feature two | |
| Measured current/rated current | No. 2 point 100Hz normalize amplitude/g | No. 3 point 200Hz and 100Hz ratio |
| 60% | 0.007908 | 0.01058 |
| 100% | 0.008206 | 0.012586 |
| 110% | 0.009764 | 0.016369 |
Set A phases and B phase windings to loosen respectively, and calculated on the basis of the feature one and feature two under normal condition
Its multiplying power.
The multiplying power that gained is calculated when A phases loosen respectively with B phases is as shown in table 3.
Table 3
| Measured current/rated current | X1A | X2A | X1B | X2B |
| 60% | 2.7594 | 1.9235 | 2.8272 | 3.8727 |
| 100% | 2.5855 | 1.7007 | 2.7756 | 1.5837 |
| 110% | 2.6024 | 1.2529 | 2.8431 | 1.2096 |
As can be seen from Table 3, loosened different mutually and under different electric currents, the multiplying power of feature one and feature two is all respectively greater than
Set threshold value multiplying power, i.e., respectively 2.5 and 1.2.It is transformer A, B phase winding according to the inventive method institute testing result
Loosen, fitted like a glove with actual conditions respectively.
The present invention is not limited to above-described embodiment.All technical schemes formed using equivalent substitution, all falling within the present invention will
The protection domain asked.
Claims (3)
1. the diagnostic method that a kind of Winding in Power Transformer based on load condition loosens, it is characterised in that perform following steps：
1）Setting is installed on the first vibrating sensor on the power transformer, the second vibrating sensor and the 3rd vibrating sensor
Sample frequency and the sampling time；
2）Measure the B phase low-pressure side electric currents of the power transformer；
3）Each vibrating sensor is sampled according to the sample frequency and sampling time, obtains the vibration of each vibrating sensor
Signal；
4）First threshold and Second Threshold are obtained by the vibration signal and B phase low-pressure side electric currents；
5）Judge whether to have set first threshold and Second Threshold, if not setting first threshold and Second Threshold, return to step
1）；If having set first threshold and Second Threshold, into step 6）；
6）The power transformer of load condition is monitored, obtains the power transformer under load operation conditions
The First Eigenvalue and Second Eigenvalue, and carry out loosening judgement；
If the First Eigenvalue is more than the first threshold and Second Eigenvalue is more than the Second Threshold, into step
7）；
If the First Eigenvalue is less than the first threshold or the Second Eigenvalue is less than the Second Threshold, obtain again
The First Eigenvalue and Second Eigenvalue are taken, and re-starts loosening and judges；
7）If by judging that obtained results are still that the First Eigenvalue is more than first threshold and Second Eigenvalue is more than for continuous 3 times
The winding loosening of two threshold values, the then power transformer；If not continuous 3 judgements show that the First Eigenvalue is more than first threshold
And Second Eigenvalue is more than the result of Second Threshold, then return to step 6）；
The first threshold is multiplied by coefficient a by the first normalization amplitude and obtained, and the first normalization amplitude is shaken for described second
The 100Hz component amplitudes of dynamic sensor divided by the B phases low-pressure side electric current perunit value square after be converted into the electric power again and become
The normalized value of the rated current of depressor；
200Hz component amplitude and threeth vibrating sensor of the Second Threshold by the 3rd vibrating sensor
The ratio of 100Hz component amplitudes is multiplied by coefficient b and obtained；
The second normalization amplitude when the First Eigenvalue is the power transformer load operation conditions, second normalizing
Change the 100Hz component amplitudes of the second vibrating sensor when amplitude is the power transformer load operation conditions divided by the B
Phase low-pressure side electric current perunit value square after be converted into again the power transformer rated current normalized value；
The Second Eigenvalue by the 3rd vibrating sensor during the power transformer load operation conditions 200Hz component width
Value and the ratio of the 100Hz component amplitudes of the 3rd vibrating sensor；
The coefficient a is more than 1 and less than 3；The coefficient b is more than 1 and less than 2.
2. the diagnostic method that the Winding in Power Transformer based on load condition loosens as claimed in claim 1, it is characterised in that：
The coefficient a is 2.5, and the coefficient b is 1.2.
3. the diagnostic method that the Winding in Power Transformer based on load condition loosens as claimed in claim 1, it is characterised in that：
Step 3）At least 3 times samplings are carried out to each vibrating sensor, and calculate the arithmetic mean of each component amplitude in vibration signal
Value；
If by 3 maximums for sampling obtained vibration signal and minimum value difference more than 50%, vibration signal is re-started
Collection；If below 50%, the arithmetic average of each component amplitude in vibration signal is calculated.
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| CN110031703B (en) * | 2019-04-25 | 2021-04-30 | 国网冀北电力有限公司检修分公司 | Abnormal working condition judging method and system for ultra-high voltage transformer |
| CN110727228B (en) * | 2019-11-12 | 2022-06-07 | 泰州市绿大地织造有限公司 | Weaving equipment operation monitoring system |
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|---|---|---|---|---|
| CN102798798A (en) * | 2012-08-07 | 2012-11-28 | 浙江大学 | Power transformer winding deformation detection method based on vibration analysis |
| CN202735425U (en) * | 2012-06-13 | 2013-02-13 | 江苏省电力公司南京供电公司 | Power transformer fault detection system based on vibration |
| CN202734953U (en) * | 2012-06-13 | 2013-02-13 | 江苏省电力公司南京供电公司 | Power transformer iron core loosening fault diagnosis apparatus |
| CN104236702A (en) * | 2014-08-29 | 2014-12-24 | 国家电网公司 | System and method for judging interior looseness of power transformer |
| CN204085686U (en) * | 2014-08-29 | 2015-01-07 | 国家电网公司 | Power transformer inside loosens judgement system |
| CN104748838A (en) * | 2015-03-27 | 2015-07-01 | 国家电网公司 | Transformer winding loose determination system and method based on finite element analysis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012058046A (en) * | 2010-09-08 | 2012-03-22 | Nissin Electric Co Ltd | Abnormality diagnosis device for power device |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202735425U (en) * | 2012-06-13 | 2013-02-13 | 江苏省电力公司南京供电公司 | Power transformer fault detection system based on vibration |
| CN202734953U (en) * | 2012-06-13 | 2013-02-13 | 江苏省电力公司南京供电公司 | Power transformer iron core loosening fault diagnosis apparatus |
| CN102798798A (en) * | 2012-08-07 | 2012-11-28 | 浙江大学 | Power transformer winding deformation detection method based on vibration analysis |
| CN104236702A (en) * | 2014-08-29 | 2014-12-24 | 国家电网公司 | System and method for judging interior looseness of power transformer |
| CN204085686U (en) * | 2014-08-29 | 2015-01-07 | 国家电网公司 | Power transformer inside loosens judgement system |
| CN104748838A (en) * | 2015-03-27 | 2015-07-01 | 国家电网公司 | Transformer winding loose determination system and method based on finite element analysis |
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