High-Voltage Test Transformer And Its Test Method Two
Release Time：
2021-05-14
Affected by temperature: During the high-pressure test, the influence of temperature is mainly manifested in the sensitivity of the test material to temperature. The material used in the transformer is insulated. When the temperature is very high, the insulation of the material will deteriorate, and the resistance of the insulation will decrease.
Affected by temperature: During the high-pressure test, the influence of temperature is mainly manifested in the sensitivity of the test material to temperature. The material used in the transformer is insulated. When the temperature is very high, the insulation of the material will deteriorate, and the resistance of the insulation will decrease. The main principles are as follows:
Irregular movement of ions and molecules. The irregular movement of molecules is severely affected by temperature. When the temperature becomes higher, the movement of molecules will become violent. Similarly, the movement of ions in the insulation resistance will gradually accelerate when the temperature rises. The polarity of the resistance becomes larger, so that the resistance value decreases.
The water dissolves. Moisture appears in the insulation resistance. When the temperature rises, the moisture will dissolve into the resistance and make the resistance smaller.
Under normal circumstances, the resistance of the resistor is inversely proportional to the temperature, so the test needs to be carried out under shielded conditions. At the same time, it is necessary to ensure that the surface of the insulation resistance is clean during the experiment, which will also cause measurement errors. In addition, it should be noted that for dry transformers, the insulation resistance is directly proportional to the temperature before the temperature is 40 degrees.
Secondly, the relationship between leakage current and voltage polarity. Since the polarity of the transformer is different when winding, the moisture contained in the resistor is also different. When the polarity of the resistance is positive, the positively charged water molecules will be repelled, so that the water molecules will be reduced, and the internal current will be less, so more current will be lost at this time; on the contrary, if it is negative , Then the water molecules will increase, and the internal current will increase. The only source of the above phenomenon is moisture in the transformer. When the voltage transformer is damp, the measured current data is inaccurate. Therefore, a new transformer should be selected when the power high voltage test is performed to improve the accuracy of the test data measurement.
Finally, the influence of the boost speed on the test. Leakage current is caused by the damp of the transformer. The generation of this current is related to factors such as air humidity, temperature, cleanliness of the insulator surface, and voltage. Whether the leakage current is affected by the boost speed, in fact, the leakage current is affected by the boost speed. A large number of experiments show that the actual measured value of the leakage current is affected by the boost speed. Under the influence of the boost speed, the actual measured value will deviate from the theoretical value. This difference is more obvious in large-capacity transformers.
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