Common problems and solutions in transformer high voltage test

In the high-voltage test of transformers, many key points should be paid attention to, and the test conditions and test methods must be accurately grasped. The faults that occur in the high voltage test of the transformer should be screened one by one, and the faults should be properly handled. Ensure that the transformer does not have any hidden dangers of failure, and then put it into use in the grid. This paper discusses the conditions and methods of transformer high-voltage test, and analyzes the processing methods of different faults.

Abnormal sound inside the transformer and its solution

If the transformer is in normal working condition, it will generate stable electromagnetic AC audio frequency, so there will be no abnormal sound inside the equipment. If there is abnormal noise inside the transformer during the high-voltage test, it indicates that the transformer is not in good working condition. It may be due to excessive load, failure of internal parts of the transformer, excessive internal bearing voltage of the transformer, or poor contact. These reasons will make the transformer make abnormal noise. At this time, the test personnel must quickly stop the test, cut off the power supply, diagnose the cause of the sound, do a serious inspection, solve the fault that caused the abnormal sound, and then proceed to the test.

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Transformer automatic tripping problem and  solution

During the high-voltage test of the transformer, sometimes there will be a tripping phenomenon. At this time, the personnel conducting the test should carefully check the transformer to find out the cause of the failure. If the trip is only caused by a problem with human operation, then the transformer does not need to be inspected. If the tripping caused by human error is ruled out, then the test personnel must conduct a thorough inspection of the transformer, and the internal and external structures must not be overlooked, and all kinds of hidden dangers should be checked one by one to avoid safety accidents and losses in the later test process. . If there is a problem with the transformer, it is easy to catch fire. Once a fire occurs in the transformer and its surroundings, the power transformer will make the fastest response to it, cut off the power supply, and turn on self-protection. If a fire breaks out and the transformer fails to activate the protection mechanism for some reason, then it is necessary for the staff to manually cut off the circuit breaker to extinguish the fire.

Transformer oil level problems and solutions

Normally, the oil level of the transformer needs to be controlled so that it is within the allowable range, and the oil level of the transformer can be adjusted according to the specific operating conditions. Therefore, during the high-voltage test, if the oil level changes greatly, it is necessary to check the transformer at this time to see if it is caused by oil leakage. If the oil level rises very obviously, the first thing to consider Whether it is affected by temperature, if it is determined that the temperature is in the normal range, then the operator needs to check the equipment, check each related component, and determine and deal with the faults that occur.