Power transformer potential fault diagnosis method
A technology for power transformers and fault diagnosis, which is applied in the measurement of electrical variables, instruments, and electrical measurement, and can solve problems such as heavy subjectivity and lack of objectivity.
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[0050] The present invention is mainly used for potential fault diagnosis of power transformers, and the specific implementation methods are as follows:
[0051] Step 1. Determination of the fault type of the power transformer. Let Ω(Θ)={f 1 , f 2 ,..., f n} is a collection of transformer fault types. Practice shows that: transformer internal faults can be divided into overheating faults and discharge faults according to their nature. The statistical results of relevant literature on the types of oil-filled electrical equipment failures are shown in Table 2:
[0052] Table 2 Statistics of failure types of oil-filled electrical equipment
[0053] Fault type
Taiwan
ratio / (%)
overheating failure
226
53.0
High Energy Discharge Fault
65
18.1
Overheating and high energy discharge fault
36
10.0
spark discharge failure
25
7.0
Moisture or partial discharge failure
7
1.9
[0054] Therefore, the t...
example 1
[0076] Table 2 Example 1 Diagnosis Results
[0077]
[0078]
[0079] It can be seen from Table 2 that the mass value of overheating fault in the first-level diagnosis is the largest, and the mass value of low-temperature overheating in the second-level diagnosis is the largest, so this kind of fault is considered to be low-temperature overheating (<300°C). From the on-site actual diagnosis, through the on-site hanging core inspection, it was found that the transformer core had a multi-point ground fault, which belonged to the low-temperature overheating type.
example 2
[0081] On June 2, 2006, the 1# main transformer of 35KV Chengnan Substation was put into operation.
[0082] h 2 =38.5 μL / L; CH 4 = 19.7 μL / L; C 2 h 6 = 48.2 μL / L; C 2 h 4 = 4.83 μL / L; C 2 h 2 = 0.99 μL / L.
[0083] The three ratio codes are 1, 0, 0, and the preliminary diagnosis is arc discharge. However, using the method of this paper for diagnosis, the results are shown in Table 3:
[0084] Table 3 Example 2 Diagnosis Results
[0085]
[0086] It can be seen from Table 3 that the mass value of other faults is the largest, so this type of fault is considered to be other faults. During the actual maintenance, no abnormality was found in the conventional electrical test of the transformer. After the oil was drained, it was found that one of the three fixing screws of the shielding cover at the end of the bushing was loose, but there was no obvious discharge trace. After tightening, the oil was degassed. Chromatographic analysis of the main transformer commissionin...
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