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First, a defect in the structure of the switch body causes a small amount of gas leak. This leak cannot be detected at ordinary times, and only after a long period of time is accumulated and reduced to a certain extent can it be detected.
Second, the arc extinguishers' manufacturing materials contain certain gaseous impurities that slowly evolve over a long period of time, causing the vacuum interrupter pressure to rise.
Third, during the operation of the switch, the arc extinguish chamber is damaged due to the external force, thereby causing the degree of vacuum of the vacuum switch to decrease.
Fourth, it is necessary to set the over-voltage and current protection value before the test boost to prevent accidental opening during the test. During the test, please give power to the work first and then power to the power supply. After the power is turned off, the power supply must be turned off to prevent damage to the instrument. Otherwise, it will affect the factory settings.
Fifth, when the inverter controller prompts over-voltage protection, over-current protection or discharge protection, please exit the test, reset the voltage and current protection values ​​or check the grounding line is good, and then enter the test.
The precautions for operation of the variable frequency series resonance test device are things that we must know when we use this instrument to perform on-site tests. This is a prerequisite for ensuring the smooth running of the test.