The power frequency withstand voltage test device consists of a power frequency test transformer and a withstand voltage control box, which perform insulation strength tests on electrical appliances, electrical components, etc. under specified voltages.

The insulation oil dielectric loss tester is a high-precision instrument used for measuring the dielectric loss angle and volume resistivity of liquid insulation media such as insulation oil.

The ultra-low frequency high-voltage generator should have an automatic grounding discharge device, and the residual charge on the test sample should be automatically discharged within 5 seconds under the rated capacitance and rated output voltage.

Before operation, the maximum working current should be calculated based on the capacity and voltage level of different test samples, and the current protector should be adjusted accordingly.

The "harmonic superposition" testing unit of the relay protection tester can achieve the superposition output of various harmonic components of three-phase voltage and current, and is used to test the working behavior of power system equipment under v