In recent years, power safety accidents of high-voltage test transformers have been more frequent, so power companies have paid more attention to high-voltage test of power transformers. Effectively do a good job in the safety measures to be done before the high-voltage test transformer test, which will greatly reduce the safety accidents in the high-voltage test transformer test, and also carry out the influencing factors in the high-voltage test of the power transformer, the test and the deviation in the test A specific elaboration.

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

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

High-voltage test transformers are easily damp, usually caused by their outer skin. Under normal circumstances, the electrical properties of water molecules in the electric field are 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 continue to decrease, so 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 will increase. But in fact, not all transformers are affected by voltage polarity. For example, new power transformers generally do not suffer from moisture. Therefore, the water content in new transformers is extremely low, or even negligible. In this way, there is no certainty between the polarity of the test voltage and the current leakage.