The oil cup adopts a three electrode structure that complies with the national standard GB/T5564-2007, with a spacing of 2mm between electrodes, which can eliminate the influence of stray capacitance and leakage on the dielectric loss test results

◆ Adopting medium frequency induction heating and PID temperature control algorithm. This heating method has the advantages of non-contact between the oil cup and the heating element, uniform heating, fast speed, and easy control, which strictly controls the temperature within the preset temperature error range

The internal standard capacitor is an SF6 gas filled three electrode capacitor, whose dielectric loss and capacitance are not affected by environmental temperature, humidity, etc., ensuring the accuracy of the instrument even after long-term use.

The AC test power supply adopts AC-DC-AC conversion method, effectively avoiding the influence of mains voltage and frequency fluctuations on the accuracy of dielectric loss testing. Even if the generator generates electricity, the instrument can operate correctly.

◆ Comprehensive protection function. When there is overvoltage, overcurrent, or high-voltage short circuit, the instrument can quickly cut off the high voltage and issue a warning message. When the temperature sensor fails or is not connected, a warning message is issued. A temperature limiting relay is installed inside the medium frequency induction heating furnace. When the temperature exceeds 120 ℃, the relay is released and the heating stops.

◆ Convenient setting of experimental parameters.

◆ Adopting a large screen LCD display with backlight and clear display. The human-machine interface is user-friendly. Simply follow the Chinese menu prompts and enter commands, and the instrument will automatically perform tests, store and print test results.

Equipped with a real-time clock, the test date and time can be saved, displayed, and printed along with the test results.

◆ Empty electrode cup calibration function. Measure the capacitance and dielectric loss factor of the empty electrode cup to determine its cleaning and assembly condition. Calibration data is automatically saved to facilitate the calculation of relative permittivity and DC resistivity.