The variable frequency series resonance tester can meet the requirements of the field test high pressure system well and has the following advantages:
(1) The test power supply has a small capacity, which reduces the constraints on the field test due to the lack of power supply capacity;
(2) The test device is small in size, and the reactor adopts multi-stage or stacking structure, which is convenient for transportation and on-site installation;
(3) Test wiring is convenient, operation is simple, test time is greatly shortened; cable fault tester
(4) High safety and reliability, the distortion of the output waveforms of the IGBT and drive circuit used in the frequency conversion device is small, and the frequency output stability is good;
(5) It has good IGBT, over-current, over-voltage and discharge protection functions, and can protect equipment and personal safety. If a breakdown occurs during the withstand voltage, the output current of the power supply will automatically decrease as the circuit loses its resonant condition. The voltage at both ends of the product suddenly drops, no overvoltage will be generated, and the discharge energy is small, so it will not cause great harm to the test device and the test sample;
(6) The equivalence of the test is good. Using an AC voltage close to the power frequency (30-300 Hz) as the test power supply, it is very close to the 50 Hz/60 Hz power frequency power supply both in terms of equivalence and consistency. Guaranteed the authenticity and reliability of the test results.