Insulation oil dielectric loss and resistivity tester

1、 Overview

The insulation oil dielectric loss and resistivity tester is designed and manufactured according to GB/T5564-2007 "Measurement of relative permittivity, dielectric loss factor, and DC resistivity of liquid insulation materials". Used for measuring the dielectric loss factor and DC resistivity of liquid insulation media such as insulating oil. Integrated structure. Internally integrated with main components such as dielectric loss oil cup, temperature controller, temperature sensor, dielectric loss testing bridge, AC test power supply, standard capacitor, high resistance meter, DC high voltage source, etc. The instrument adopts fully digital technology internally, with intelligent and automated measurement. It is equipped with a color large screen LCD display, a fully Chinese menu, and Chinese prompts for each step. The test results can be automatically stored and printed out, and operators can proficiently use them without professional training.

2、 Main functions and features

(1) 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.
(2) The instrument adopts 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.
(3) 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.
(4) 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.
(5) Complete 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 degrees, the relay is released and the heating stops.
(6) Convenient setting of experimental parameters. The temperature setting range is 0-120 ℃, the AC voltage setting range is 500-2200V, and the DC voltage setting range is 300-500V.
(7) 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 testing. And automatically store and print test results.
(8) Equipped with a real-time clock, the test date and time can be saved, displayed, and printed along with the test results.
(9) 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 for accurate calculation of relative permittivity and DC resistivity.

3、 Main technical indicators

Power supply voltage: AC 220V ± 10%
Power frequency: 50Hz/60Hz ± 1%
Measurement range: capacitance 5pF~200pF; Relative permittivity ranging from 1.000 to 30.000; Dielectric loss factor 0.00001~100
DC resistivity ranging from 2.5 M Ω m to 20 T Ω m
Measurement accuracy: capacitance ± (1% reading+0.5pF)
Relative permittivity ± 1% reading
Dielectric loss factor ± (1% reading+0.0001)
DC resistivity ± 10% reading
Resolution: capacitance of 0.01pF; relative permittivity of 0.001; Dielectric loss factor 0.00001
Temperature measurement range: 0-120 ℃
Temperature measurement error: ± 0.5 ℃
AC test voltage: 500-2200V continuously adjustable, frequency 50Hz
DC test voltage: 300-500V continuously adjustable
Power consumption: 100W
Dimensions: 500 × 360 × 420
Total weight: 22Kg

4、 Usage conditions

Environmental temperature: 0 ℃~40 ℃
Relative humidity:<75%