A brief discussion on dielectric loss testing!!
1. What is dielectric loss?
Dielectric loss: The energy loss caused inside an insulating material due to the hysteresis effect of dielectric conductivity and dielectric polarization under the action of an electric field. Also called dielectric loss, referred to as dielectric loss.
2. What is the purpose of the dielectric loss test?
The purpose of measuring dielectric loss is to determine the insulation condition of electrical equipment. Measuring dielectric loss factor is an indispensable item in preventive testing. Because the dielectric loss factor of electrical equipment is too large, a lot of energy in the equipment insulation will be lost in the form of heat under the action of AC voltage. The heat generated will increase the temperature of the insulation of the electrical equipment, aging the insulation, and even causing thermal breakdown of the insulation. The decrease in insulation capacity is directly reflected in the increase in dielectric loss factors. Further, the reasons for insulation degradation can be analyzed, such as: insulation moisture, insulating oil contamination, aging and deterioration, etc. Therefore, the dielectric loss test must be carried out during the factory test. The electrical equipment in operation must also undergo this kind of test. While measuring the dielectric loss, the capacitance of the sample can also be obtained. Obvious changes in capacitance reflect short circuit or open circuit in one or more of the multiple capacitors.
3. What are the main application areas of dielectric loss testers?
The dielectric loss tester is mainly widely used in the power industry to measure the dielectric loss of power transformers, transformers, capacitors, arresters, bushings and other equipment. The dielectric loss insulation test can effectively detect the overall moisture degradation of electrical equipment insulation, as well as local defects, etc. It is widely used in electrical manufacturing, electrical equipment installation, handover and prevention.
4. RD6001 Intelligent dielectric loss tester
The RD6001 intelligent dielectric loss tester produced by our company is a high-precision testing instrument for testing the dielectric loss tangent value and capacitance of various high-voltage power equipment on-site or in laboratories such as power plants and substations. The instrument has an integrated structure with built-in dielectric loss test bridge, variable frequency voltage regulator power supply, step-up transformer and SF6 high stability standard capacitor. The test high-voltage source is generated by the inverter inside the instrument, and is used for testing the tested product after being boosted by the transformer. The frequency can be changed to 50Hz, 47.5Hz\52.5Hz, 45Hz\55Hz, 60Hz, 57.5Hz\62.5Hz, 55Hz\65Hz. It adopts digital notch technology to avoid the interference of power frequency electric field on the test and fundamentally solve the problem. The problem of accurate measurement under strong electric field interference. It is also suitable for occasions where generator power is used for testing after a total power outage. This instrument is equipped with an insulating oil cup and a temperature control device to test the dielectric loss of insulating oil.
The instrument can be tested using various methods such as internal high voltage, external high voltage, internal standard, external standard, forward connection method, reverse connection method, self-excitation method, etc. Customers and friends are welcome to consult.
END
