Precautions for the use of variable frequency series resonant devices:

1. Before conducting a voltage withstand test using a variable frequency series resonant device. Please measure the insulation resistance of the test sample according to the test procedure and confirm that it meets the relevant insulation requirements before proceeding to the next step of the voltage withstand test.

2. Before conducting a voltage withstand test and starting the frequency converter series resonant device, please recheck if the wiring is correct. For example, the voltage output terminal of the excitation transformer should be connected to the lower end of the lowest level reactor using a grounding cable. The high-voltage output line at the upper end of the upper level reactor should be suspended as much as possible from the ground or surrounding objects to prevent the high-voltage line from discharging to the ground or objects. Every small mistake you make can cause irreparable damage to equipment and personnel, and every correction you make will be extremely valuable for the safety of on-site personnel and equipment.

3. For the safety of personnel and equipment, the grounding requirements of the variable frequency series resonant device are high. When connecting the substation grounding grid, the dirt, rust, and paint on the grounded pile, switchgear cabinet, and transformer shell should be pre treated to ensure effective connection between the grounding wire and the grounding device. When there is no grounding device for field operations, a metal rod of about 150cm in length can be used and a relatively humid location can be selected. The metal rod should be buried underground for no less than 120cm, and if necessary, an appropriate amount of water can be injected to ensure reliable grounding of the equipment.

4. The equipment power supply should use two live wires of 380V, and the instrument's 220V power supply live wire should be disconnected from the 380V live wire. It is recommended to avoid using equipment such as welding machines in the power supply circuit to prevent interference. When using a generator power supply, the neutral wire should be grounded.

5. If the test sample discharges and the instrument overvoltage protection returns, it will cause damage to the instrument. The phenomenon of the discharge process varies greatly. In addition, the instrument works in the field frequently, and the transportation and use environments are poor. Therefore, we strongly recommend that you take measures to prevent vibration and dust during transportation.