The complete set of frequency conversion series resonance test equipment consists of frequency and voltage regulation power supply, excitation transformer, reactor, and capacitive voltage divider; The complete set of frequency conversion series resonance test equipment adopts the method of adjusting the power supply frequency to achieve resonance between the reactor and the tested capacitor, and obtain high voltage and high current on the tested object. It is a new method of high voltage testing and has been widely used at home and abroad.
The AC withstand voltage test of various large power transformers, power cables, steam turbines, hydro generators, and other capacitive equipment must be conducted regularly in strict accordance with the test regulations for the complete set of frequency conversion series resonance test equipment. Under power frequency conditions, due to the large capacitance of the test object or high requirements for the test voltage, there are also high requirements for the power capacity of the variable frequency series resonance test equipment.
Common problems and troubleshooting methods of the complete set of frequency conversion series resonance test equipment
1. The fan of the complete set of frequency conversion series resonance test device cannot start:
Phenomenon: After emergency stop, fault protection, and detuning protection. The 'fault reset' button was not pressed.
Reason: High internal temperature, thermal protection of power components;
Exclusion method: Turn off the power supply of the variable frequency series resonance test set, let it stand for about 30 minutes, turn on the power again, press the "reset" button on the panel of the variable frequency series resonance test set, and then start the set of variable frequency series resonance test set. If the fan still cannot be started, please contact the manufacturer of the frequency conversion series resonance test equipment, which cannot be disassembled!
2. Unable to complete automatic adjustment. Unable to find resonance point:
Phenomenon: The tuning curve is completely a straight line, and after tuning is completed, the complete set of frequency conversion series resonance test equipment prompts that there is no resonance point;
Reason: Poor grounding of the circuit and incorrect wiring of the test circuit. The device instrument is open circuit.
This method is to check whether the device is reliable, check the on/off of the high and low voltage coils of the excitation transformer, and whether there are any open circuit points in the grounding connection wire. a. Check the continuity of each reactor; b. Check the continuity of the signal line of the voltage divider, c. Check the continuity of the high and low voltage capacitor arms of the voltage divider, d. When the device is boosting itself and there is no resonance point, it is also necessary to check the continuity of the compensating capacitor. If all parts are normal and there is still no resonance point, please check with the manufacturer. This is an inseparable instrument!