Split core current transformer secondary contacts

The secondary grounding of the split current transformer refers to the grounding of the secondary S2 terminal of the current transformer or the grounding of the N terminal of the voltage transformer. The secondary and primary windings of the split current transformer only need to be grounded at a single point. Before grounding, the secondary winding has no potential contact with the earth. After grounding, the split current transformer will not form a loop with the ground, and the current will not flow to the ground during normal operation. When the insulation layer between the primary winding and the secondary winding is damaged, the primary high voltage is connected in series to the secondary circuit, and the primary high voltage is grounded at a fixed potential, so that the current flows to the ground. The secondary voltage of the split current transformer is grounded to ensure the secondary appearance and personal safety.

Note: The current transformer can only be grounded at one point. Regarding the secondary circuit of the current transformer, it is maintenance grounding. Grounding can avoid grounding current between multiple connection addresses and affect the information collected by the split current transformer.

1. What is the significance of a small stranding?

Answer: The secondary side of the current/voltage transformer is grounded at a certain point on its n line.

2. Why is the current transformer grounded only at one point?

Answer: The current at the two grounding points of the secondary circuit will be deflected. In other words, some current flows into the air through one point and then flows back through another point. Stop the current sampling of the connected maintenance/measurement/metering equipment, which may lead to incorrect maintenance use.

3. Why can the voltage transformer only be grounded at one point?

Answer: Two-point grounding will cause the neutral point potential of the secondary voltage circuit n line (ie N600) to shift. Stop the voltage sampling on all equipment, which can easily lead to incorrect maintenance use.