Whether there is a fault in the secondary open circuit of the current transformer
May 07, 2022| 1. Whether the current transformer body has abnormal noise, whether the vibration is uneven, whether there is smoke and heat, etc., but these symptoms are not obvious when the load is relatively small.
2. The indication of the loop instrument is abnormal. When the measuring meter is used to detect the open circuit of the flow loop, the indication of the three-phase ammeter is not consistent, and the indication of the power meter is reduced, and the speed of the meter is slow or does not rotate.
3. The current transformer has a relatively obvious discharge phenomenon at the secondary circuit terminal or component wire head.
4. The relay protection appears to refuse to act or malfunction. In this case, it can be found when there is a false trip or a leapfrog trip.
5. The relay and watt-hour meter of the protection device are smoking or burnt out.