ZCT503 Pin type zero phase current transformer supplier

Electrical Specification

(Customized is available)

Rated Current	30A
DC Resistance at 25℃	40±5Ω
Dielectric Withstanding     Voltage(Hi-pot)	3000Vrms
Output Voltage Vo	7.5-8.5mV

The basic principle is the same as that of ordinary transformers. The main differences are:

1. The use methods are different. The zero phase current transformer is used to detect the zero phase current. Generally, all three live wires are passed through the inner hole of the transformer, and the vector sum of the three phase current is measured, that is, the zero-sequence current.
2. The characteristics of zero phase current determine that under normal circumstances, the primary current of the zero phase transformer is very small, but under abnormal conditions, the zero-sequence current will also be very large. This requires a wide measurement range of the zero phase current transformer. Therefore, the zero phase transformer usually allows a larger multiple of overload, and the overload capacity is reflected by the “accurate limit coefficient”.
3. Since the zero phase transformer usually passes through three live wires, under the same primary current, the inner hole of the zero phase transformer is larger. “Inner hole diameter” is an important index of zero phase transformer, which should be indicated when ordering.