Safety measures required for high voltage test of power transformer

In the operation of the power system, the insulation defect of the high-voltage test transformer is an important factor causing equipment failure. A large part of the current power system accidents are caused by insulation defects. Therefore, in order to effectively reduce the probability of accidents, in the operation of electric power, electric power professionals can use various high-voltage test methods to effectively test the data and information of the equipment operation, so as to judge the feasibility of the equipment operation. With the continuous improvement of the power market, power companies are in the fierce market competition. In order to effectively occupy the market, they have an advantage in the competition, ensure the quality of power equipment, and ensure the safety in use is to improve their own market. An important means of competitiveness.

Test transformers are divided into many types. Under normal circumstances, the high-voltage test of power transformers can be divided into two categories, characteristic tests and insulation tests. The characteristic test is mainly to test the main circuit contact resistance, the volt-ampere curve, GIS, polarity, etc. of the circuit breaker of electrical equipment such as power transformers. The insulation test includes both destructive and non-destructive. The former involves DC voltage and other withstand voltage test. Because of the high voltage, it is easy to find defects in the equipment during the test, but it is destructive. Therefore, it is easy to damage the insulation of the equipment during the test, thereby greatly reducing the length of its life. The latter is generally tested in a non-destructive way to detect defects in the electrical equipment as a whole, but because of the relatively low voltage, the sensitivity is relatively low. The effects produced by different tests are also different, but in actual tests, non-destructive tests are a more common test method.

Transformers are prone to moisture, usually caused by their skin. Usually, the water molecules in the electric field are electrically positive, but if a positive voltage is applied to the windings of the transformer, the water molecules will change, and the amount of water will decrease. Therefore, the amount of current passing through the transformer will also change. less. When the applied voltage is negative, the amount of current passing through the transformer increases. But in reality, the transformers are not all affected by the polarity of the voltage. For example, the new type of power transformer generally does not appear to be damp. Therefore, the water content in the new transformer is extremely low or even negligible. In this way, there is no connection between the polarity of the test voltage and the current leakage.

In order to ensure the safe and accurate work of the power transformer, the electric high voltage test transformer is an important guarantee to ensure its safe operation. In the high-voltage test, the professional requirements are relatively high. Therefore, professional technicians with strong professional knowledge should be selected to carry out the test. At the same time, various safety protection measures should be taken before the test, and the test skills should be flexibly grasped in the test. Try to avoid the occurrence of various factors that affect the test results, so as to ensure the accuracy of the test results.