(1) The current transformer shall not open the circuit on the secondary side during operation. Once the secondary side is open, the iron loss is too large, the temperature is too high to burn, or the secondary winding voltage is increased to break the insulation, and a high voltage electric shock occurs. danger. Therefore, when changing the meter, such as changing the current meter, active meter, reactive meter, etc., the current loop should be shorted before the meter is exchanged. When the meter is adjusted, first connect it to the secondary circuit and then remove the short wiring and check whether the meter is normal.
If sparks are found when the short wires are removed, the current transformers are open, and should be short-circuited immediately to find out that there is no open circuit in the meter circuit before re-disconnecting the short wires. When removing the current transformer short-circuit work, it should be placed on the insulation pad. In addition, the protection device of the current transformer circuit should be deactivated. After the work is completed, the protection device can be put into operation.
(2) If the current transformer has a click, check if the inner core is loose and tighten the core bolt.
(3) One end of the secondary side of the current transformer, the outer casing must be reliably grounded.
(4) When the insulation resistance of the secondary side coil of the current transformer is lower than 10-20 ohms, it must be dried to restore the insulation before use.https://www.ctsensorducer.com/