CN105136440A - Power transformer winding looseness diagnostic method based on load state - Google Patents
Power transformer winding looseness diagnostic method based on load state Download PDFInfo
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- CN105136440A CN105136440A CN201510528267.2A CN201510528267A CN105136440A CN 105136440 A CN105136440 A CN 105136440A CN 201510528267 A CN201510528267 A CN 201510528267A CN 105136440 A CN105136440 A CN 105136440A
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Abstract
The invention relates to a power transformer winding looseness diagnosis method based on a load state, which belongs to the technical field of power transformer safety monitoring. The method comprises the steps that 1) sampling frequency and time are set; 2) the B-phase low voltage side current of a power transformer is measured; 3) a vibration signal of each vibration sensor is acquired; 4) a first threshold and a second threshold are calculated; 5 ) whether the first threshold and the second threshold are set is determined; 6) the power transformer in the load state is monitored, and looseness is determined; and 7) if the result of three consecutive times of determining is that a first characteristic value is greater than the first threshold and a second characteristic value is greater than the second threshold, a winding of the power transformer is loose; if the result of three consecutive times of determining is not that the first characteristic value is greater than the first threshold and the second characteristic value is greater than the second threshold, the process returns to the step 6 ). According to the method, winding looseness diagnosis is carried out through the relationship between fundamental frequency and the frequency doubling component, and the problem of poor accuracy is avoided.
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
From both at home and abroad about the statistical data of transformer shows, the loosening distortion of winding is one of the more reason that breaks down.For the transformer having winding to loosen, when loosen do not jeopardize insulation time, in oil, total hydrocarbon and each component concentration keep normal, the most simple, intuitive of pendant-core examination but but to spend a large amount of human and material resources, financial resources.Therefore, the method that easy detection Transformer Winding loosens must be sought.
From the angle of physical construction, the vibration on power transformer body surface and the compression situation of Transformer Winding closely related.Whether the basket vibration that electromagnetic force causes can be delivered to tank surface by iron core, supporting rod and insulating oil, therefore can detect winding by the mode of measuring vibrations and loosen.It is convenient that Power Transformer Condition monitoring method based on vibration signal realizes, and monitoring system and transformer do not have electrical link, and the equipment that do not affect normally runs.Prior art is studied transformer vibration, analyzes Transformer Winding and loosens 100Hz component in distortion rear fuel tank vibration signal and can change, and to square being directly proportional of winding current.If only diagnose Transformer Winding is loosening according to the change of fundamental component, its accuracy is not high, easily occurs erroneous judgement.
Summary of the invention
The technical problem to be solved in the present invention is, not enough for prior art, proposes the diagnostic method that a kind of Winding in Power Transformer based on load condition loosens.
The present invention is the technical scheme solving the problems of the technologies described above proposition: the diagnostic method that a kind of Winding in Power Transformer based on load condition loosens, and performs following steps:
1) setting is installed on sample frequency and the sampling time of the first vibration transducer on described power transformer, the second vibration transducer and the 3rd vibration transducer;
2) the B phase low-pressure side electric current of described power transformer is measured;
3) according to described sample frequency and sampling time, each vibration transducer is sampled, obtain the vibration signal of each vibration transducer;
4) first threshold and Second Threshold is obtained by described vibration signal and B phase low-pressure side electric current;
5) judge whether to set first threshold and Second Threshold, if do not set first threshold and Second Threshold, then return step 1); If set first threshold and Second Threshold, then enter step 6);
6) the described power transformer of load condition is monitored, obtain the First Eigenvalue of described power transformer under load operation conditions and Second Eigenvalue, and carry out loosening and judge.
If described the First Eigenvalue is greater than described first threshold and Second Eigenvalue is greater than described Second Threshold, then enter step 7);
If described the First Eigenvalue is less than described first threshold or described Second Eigenvalue is less than described Second Threshold, then again obtain the First Eigenvalue and Second Eigenvalue, and re-start loosening judgement;
7) if through judging that the result that obtains is still the First Eigenvalue and is greater than first threshold and Second Eigenvalue is greater than Second Threshold for continuous 3 times, then the winding of described power transformer loosens; Judge for 3 times if not continuous to show that the First Eigenvalue is greater than first threshold and Second Eigenvalue is greater than the result of Second Threshold, then return step 6);
Described first threshold is multiplied by coefficient a by the first normalization amplitude and obtains, described first normalization amplitude be described second vibration transducer 100Hz component amplitude divided by described B phase low-pressure side electric current perunit value square after be converted into the normalized value of the rated current of described power transformer again;
Described Second Threshold is multiplied by coefficient b by the ratio of the 200Hz component amplitude of described 3rd vibration transducer and the 100Hz component amplitude of described 3rd vibration transducer and obtains;
The second normalization amplitude when described the First Eigenvalue is described power transformer load operation conditions, the 100Hz component amplitude of the second vibration transducer when described second normalization amplitude is described power transformer load operation conditions divided by described B phase low-pressure side electric current perunit value square after be converted into the normalized value of the rated current of described power transformer again;
Described Second Eigenvalue is by the ratio of the 200Hz component amplitude of the 3rd vibration transducer during described power transformer load operation conditions and the 100Hz component amplitude of described 3rd vibration transducer;
Described coefficient a is greater than 1 and is less than 3; Described coefficient b is greater than 1 and is less than 2;
The improvement of technique scheme is: described coefficient a is 2.5, and described coefficient b is 1.2.
The improvement of technique scheme is: step 3) carries out at least 3 samplings to described each vibration transducer, and calculates the arithmetic average of each component amplitude in vibration signal.If through maximal value and the minimum value difference more than 50% of 3 vibration signals obtained of sampling, then re-start the collection of vibration signal; If below 50%, then calculate the arithmetic average of each component amplitude in vibration signal.
The invention has the beneficial effects as follows: this method utilizes the relation of fundamental frequency and harmonic thereof to carry out the loosening diagnosis of winding, improve diagnostic accuracy, evaded the problem that the next precision of the overall smaller strip of harmonic signal is inadequate simultaneously, utilize 100Hz, 200Hz component and mutual relation thereof judge that Transformer Winding loosens defect, due in transformer vibration signal, 100Hz and 200Hz component amplitude is larger, so not high to signal monitoring accuracy requirement, but also consider the impact of winding current on vibration signal amplitude, can facilitate, judge that Transformer Winding loosens defect exactly.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the process flow diagram of the embodiment of the present invention.
Fig. 2 is power transformer in the embodiment of the present invention and the schematic diagram being installed on the vibration transducer on power transformer.
Fig. 3 is embodiment of the present invention transformer A phase winding No. 2 o'clock rumble spectrum figure under 60% rated current when loosening.
Fig. 4 is embodiment of the present invention transformer A phase winding No. 2 o'clock rumble spectrum figure under 100% rated current when loosening.
Fig. 5 is embodiment of the present invention transformer A phase winding No. 2 o'clock rumble spectrum figure under 110% rated current when loosening.
Embodiment
Embodiment
The diagnostic method that a kind of Winding in Power Transformer based on load condition of the present embodiment loosens, performs following steps:
1) setting is installed on sample frequency and the sampling time of the first vibration transducer on power transformer, the second vibration transducer (No. 2 points) and the 3rd vibration transducer (No. 3 points);
2) the B phase low-pressure side electric current of power transformer is measured;
3) according to sample frequency and sampling time, each vibration transducer is sampled, obtain the vibration signal of each vibration transducer;
4) first threshold and Second Threshold is obtained by vibration signal and B phase low-pressure side electric current;
5) judge whether to set first threshold and Second Threshold, if do not set first threshold and Second Threshold, then return step 1); If set first threshold and Second Threshold, then enter step 6);
6) power transformer of load condition is monitored, obtain the First Eigenvalue of power transformer under load operation conditions and Second Eigenvalue, and carry out loosening and judge.
If the First Eigenvalue is greater than first threshold and Second Eigenvalue is greater than Second Threshold, then enter step 7);
If the First Eigenvalue is less than first threshold or Second Eigenvalue is less than Second Threshold, then again obtain the First Eigenvalue and Second Eigenvalue, and re-start loosening judgement;
7) if through judging that the result that obtains is still the First Eigenvalue and is greater than first threshold and Second Eigenvalue is greater than Second Threshold for continuous 3 times, then the winding of power transformer loosens; Judge for 3 times if not continuous to show that the First Eigenvalue is greater than first threshold and Second Eigenvalue is greater than the result of Second Threshold, then return step 6);
First threshold is multiplied by coefficient a by the first normalization amplitude and obtains, the first normalization amplitude be the second vibration transducer (No. 2 points) 100Hz component amplitude divided by B phase low-pressure side electric current perunit value square after be converted into the normalized value of the rated current of power transformer again;
Second Threshold is multiplied by coefficient b by the ratio of the 200Hz component amplitude of the 3rd vibration transducer (No. 3 points) and the 100Hz component amplitude of the 3rd vibration transducer (No. 3 points) and obtains;
The second normalization amplitude when the First Eigenvalue is power transformer load operation conditions, the 100Hz component amplitude of the second vibration transducer (No. 2 points) when the second normalization amplitude is power transformer load operation conditions divided by B phase low-pressure side electric current perunit value square after be converted into the normalized value of the rated current of power transformer again;
Second Eigenvalue is by the ratio of the 200Hz component amplitude of the 3rd vibration transducer (No. 3 points) during power transformer load operation conditions and the 100Hz component amplitude of the 3rd vibration transducer (No. 3 points);
Coefficient a is greater than 1 and is less than 3; Coefficient b is greater than 1 and is 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 samplings to each vibration transducer, and calculates the arithmetic average of each component amplitude of vibration signal.If through maximal value and the minimum value difference more than 50% of 3 vibration signals obtained of sampling, then re-start the collection of vibration signal; If below 50%, then calculate the arithmetic average of each component amplitude of vibration signal.
In the present embodiment, the transformer of monitoring, for hanging bell-type power transformer, arranges 3 vibration transducers on its surface, 3 vibration transducers are adsorbed on fuel tank upper surface securely by magnet, respectively the corresponding axial vibration signal gathering Three-Phase Transformer winding.As shown in Figure 2,1 ~ 3 installation site being 3 vibration transducers, A, B, C represent the high-pressure side of three-phase windings, and a, b, c represent the low-pressure side of three-phase windings, and 0 represents zero phase.
In order to verify effect of the present invention, spy carries out following demonstration test.
The power transformer that one bench-type number is SFZ10-31500/110 is tested according to above-mentioned steps.This power transformer basic parameter is as shown in table 1.
Table 1
| Voltage ratio | Capacity | Joint group | Low-pressure side I N |
| 110/10.5kV | 31500kVA | YN,d11 | 1732A |
Filtering process and time-frequency conversion are carried out to the vibration signal collected by vibration transducer, obtains the rumble spectrum figure under different electric current, as in Figure 3-5.
First the ratio normally loosening No. 2 point 100Hz normalization amplitudes under state and No. 3 point 200Hz and 100Hz without winding is recorded, as shown in table 2.
Table 2
| Feature one | Feature two | |
| Measured current/rated current | No. 2 point 100Hz normalization amplitude/g | The ratio of No. 3 point 200Hz and 100Hz |
| 60% | 0.007908 | 0.01058 |
| 100% | 0.008206 | 0.012586 |
| 110% | 0.009764 | 0.016369 |
Arrange A phase and B phase winding respectively to occur to loosen, and be its multiplying power of benchmark with the feature one under normal condition and feature two:
(1)
In formula,
tfor the value of characteristic quantity calculated; A value is 1,2, respectively representation feature one and feature two; B is for loosening phase, and symbol is respectively A, B.
The multiplying power that gained occurs to calculate when loosening respectively for A phase and B phase is as shown in table 3.
Table 3
| Measured current/rated current | X 1A | X 2A | X 1B | X 2B |
| 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, under difference loosens phase and different electric current, the multiplying power of feature one and feature two is greater than set threshold value multiplying power all respectively, is namely respectively 2.5 and 1.2.Loosen respectively for this transformer A, B phase winding according to the inventive method institute testing result, fit like a glove with actual conditions.
The present invention is not limited to above-described embodiment.All employings are equal to the technical scheme of replacing and being formed, and all drop on the protection domain of application claims.
Claims (3)
1., based on the diagnostic method that the Winding in Power Transformer of load condition loosens, it is characterized in that performing following steps:
1) setting is installed on sample frequency and the sampling time of the first vibration transducer on described power transformer, the second vibration transducer and the 3rd vibration transducer;
2) the B phase low-pressure side electric current of described power transformer is measured;
3) according to described sample frequency and sampling time, each vibration transducer is sampled, obtain the vibration signal of each vibration transducer;
4) first threshold and Second Threshold is obtained by described vibration signal and B phase low-pressure side electric current;
5) judge whether to set first threshold and Second Threshold, if do not set first threshold and Second Threshold, then return step 1); If set first threshold and Second Threshold, then enter step 6);
6) the described power transformer of load condition is monitored, obtain the First Eigenvalue of described power transformer under load operation conditions and Second Eigenvalue, and carry out loosening and judge;
If described the First Eigenvalue is greater than described first threshold and Second Eigenvalue is greater than described Second Threshold, then enter step 7);
If described the First Eigenvalue is less than described first threshold or described Second Eigenvalue is less than described Second Threshold, then again obtain the First Eigenvalue and Second Eigenvalue, and re-start loosening judgement;
7) if through judging that the result that obtains is still the First Eigenvalue and is greater than first threshold and Second Eigenvalue is greater than Second Threshold for continuous 3 times, then the winding of described power transformer loosens; Judge for 3 times if not continuous to show that the First Eigenvalue is greater than first threshold and Second Eigenvalue is greater than the result of Second Threshold, then return step 6);
Described first threshold is multiplied by coefficient a by the first normalization amplitude and obtains, described first normalization amplitude be described second vibration transducer 100Hz component amplitude divided by described B phase low-pressure side electric current perunit value square after be converted into the normalized value of the rated current of described power transformer again;
Described Second Threshold is multiplied by coefficient b by the ratio of the 200Hz component amplitude of described 3rd vibration transducer and the 100Hz component amplitude of described 3rd vibration transducer and obtains;
The second normalization amplitude when described the First Eigenvalue is described power transformer load operation conditions, the 100Hz component amplitude of the second vibration transducer when described second normalization amplitude is described power transformer load operation conditions divided by described B phase low-pressure side electric current perunit value square after be converted into the normalized value of the rated current of described power transformer again;
Described Second Eigenvalue is by the ratio of the 200Hz component amplitude of the 3rd vibration transducer during described power transformer load operation conditions and the 100Hz component amplitude of described 3rd vibration transducer;
Described coefficient a is greater than 1 and is less than 3; Described coefficient b is greater than 1 and is less than 2.
2., as claimed in claim 1 based on the diagnostic method that the Winding in Power Transformer of load condition loosens, it is characterized in that: described coefficient a is 2.5, described coefficient b is 1.2.
3. as claimed in claim 1 based on the diagnostic method that the Winding in Power Transformer of load condition loosens, it is characterized in that: step 3) carries out at least 3 samplings to described each vibration transducer, and calculates the arithmetic average of each component amplitude in vibration signal;
If through maximal value and the minimum value difference more than 50% of 3 vibration signals obtained of sampling, then re-start the collection of vibration signal; If below 50%, then calculate the arithmetic average of each component amplitude in vibration signal.
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| CN110031703A (en) * | 2019-04-25 | 2019-07-19 | 国网冀北电力有限公司检修分公司 | A kind of the unusual service condition method of discrimination and system of super extra-high voltage transformer |
| CN110727228A (en) * | 2019-11-12 | 2020-01-24 | 泰州市绿大地织造有限公司 | Weaving equipment operation monitoring system |
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