Power transformer inspection inspection should note the following:
(1) the sound is normal, the normal operation of the transformer has a slight buzzing, which is alternating current through the coil when the magnetic flux generated by the use of transformer core vibration sound, the normal operation, the sound is clear and regular , But when the transformer load changes or abnormal operation and the occurrence of an accident, will produce abnormal sound, so you can judge the operation of the transformer according to the sound.
1 When there is a change in the buzz, but no noise, then the load may have a big change.
2 due to the start of large equipment, so that the transformer issued wow wow sound, such as electric arc furnace, power transformer thyristor rectifier load, due to high harmonic components, starting will be issued wow wow sound.
3 caused by the overload of the transformer issued a large, heavy buzz.
4 system short-circuit or ground, due to a large number of short-circuit current, the transformer when used to issue a lot of noise.
5 individual parts loosening, so that the transformer is very unusual sound inside, such as iron core clip screw is not tight, resulting in loose core, the transformer issued a strong noise.
6 due to poor internal contact or insulation is breakdown, so that the issue of sound within the transformer. 7 due to ferromagnetic resonance, so that the uneven thickness of the transformer issued noise.
(2) Check whether the transformer itself has seepage, oil leakage, oil color and oil level is normal, the new transformer oil was light yellow, light red after running, if any exception for processing.
(3) the transformer current and temperature are normal: the national provisions of the transformer winding temperature rise of 65K, it is based on the A-class insulation-based, power transformer because the general ambient temperature below 40 °, then 40 ° +65 ° = 105 °, is the A-class insulation limit temperature.
(4) transformer casing is clean, with or without damage, cracks and discharge traces. Transformer casing dirty most likely to cause tube flashover, causing tripping, and can not guarantee reliable power supply, on the other hand, due to dirt absorption of moisture, so that the conductive properties, not only the surface easily lead to surface discharge, may also cause leakage current increase, So that casing heat, and finally lead to breakdown.
(5) transformer grounding is good, one or two leads and the contact is tightened, the power transformer parts of the electrical distance is in line with the requirements.
(1) the sound is normal, the normal operation of the transformer has a slight buzzing, which is alternating current through the coil when the magnetic flux generated by the use of transformer core vibration sound, the normal operation, the sound is clear and regular , But when the transformer load changes or abnormal operation and the occurrence of an accident, will produce abnormal sound, so you can judge the operation of the transformer according to the sound.
1 When there is a change in the buzz, but no noise, then the load may have a big change.
2 due to the start of large equipment, so that the transformer issued wow wow sound, such as electric arc furnace, power transformer thyristor rectifier load, due to high harmonic components, starting will be issued wow wow sound.
3 caused by the overload of the transformer issued a large, heavy buzz.
4 system short-circuit or ground, due to a large number of short-circuit current, the transformer when used to issue a lot of noise.
5 individual parts loosening, so that the transformer is very unusual sound inside, such as iron core clip screw is not tight, resulting in loose core, the transformer issued a strong noise.
6 due to poor internal contact or insulation is breakdown, so that the issue of sound within the transformer. 7 due to ferromagnetic resonance, so that the uneven thickness of the transformer issued noise.
(2) Check whether the transformer itself has seepage, oil leakage, oil color and oil level is normal, the new transformer oil was light yellow, light red after running, if any exception for processing.
(3) the transformer current and temperature are normal: the national provisions of the transformer winding temperature rise of 65K, it is based on the A-class insulation-based, power transformer because the general ambient temperature below 40 °, then 40 ° +65 ° = 105 °, is the A-class insulation limit temperature.
(4) transformer casing is clean, with or without damage, cracks and discharge traces. Transformer casing dirty most likely to cause tube flashover, causing tripping, and can not guarantee reliable power supply, on the other hand, due to dirt absorption of moisture, so that the conductive properties, not only the surface easily lead to surface discharge, may also cause leakage current increase, So that casing heat, and finally lead to breakdown.
(5) transformer grounding is good, one or two leads and the contact is tightened, the power transformer parts of the electrical distance is in line with the requirements.