Faults of the genset transformer include phase-to-phase short-circuit of the winding, short-circuit to the ground, short-circuit between turns, disconnection of the core, failure of the core, and failure of the casing and the lead-out line. When a fault occurs outside the transformer, the transformer will increase in temperature due to the large short-circuit current flowing through the winding. The transformer will over-load over-excitation operation for a long time, which will also cause overheating and insulation damage of the winding and the core. The following abnormalities occur in the transformer: 1 transformer is on fire and smoke; 2 terminals are overheated and blown to form non-full phase operation; 3 casing is broken, a large amount of oil is injected (for wet transformers); 4 casing has severe cracking and discharge phenomenon.
After the generator fails, it is first necessary to find out the cause of the fault and the location of the fault, and then take corresponding measures to eliminate it. If necessary, it should be repaired by a professional generator or manufacturing company. Precautions in the use of current transformer: For high-voltage windings, the secondary winding must be reliably grounded during operation, so that when the primary and secondary windings are broken down by high voltage due to insulation damage, the high voltage can be attracted to the earth. Thereby ensuring personal and equipment safety. The secondary side of the current transformer is not allowed to open. The maintenance items and maintenance cycle of the transformer: the internal maintenance cycle of the voltage transformer is once in S-10; the internal maintenance cycle of the current transformer is once in 1-3 years. Maintenance items: 1 visual inspection; 2 insulation test.
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