PCT702 precision current transformer class

Electrical Specification

(Customized is available)

Rated Primary Current	20A
Max Primary Current	80A
Rated Secondary Current	8mA
Accuracy	0.1~2.0
Electrical Strength	3000VAC 1mA60s
Load Resistance	10Ω
Rated Frequency	50/60HZ

Under all operating conditions, the secondary winding terminals of the current transformer cannot be opened, otherwise dangerous high voltages will be caused, resulting in personal safety and accidents of machinery and equipment.

This is because when the secondary winding of the current transformer is open, all the current in the primary winding of the transformer is the excitation current, which greatly increases the magnetic flux density in the iron core, and then induces thousands of volts in the secondary winding. Induced electric potential precipitates the insulation layer of the secondary winding and threatens the lives of workers.

In addition, because the magnetic flux density is greatly increased, the eddy current and hysteresis loss in the iron core are greatly increased, causing a lot of heat, so that the temperature of the magnetic conductor of the transformer exceeds the maximum safe range. This high temperature Winding insulation is very harmful. Third, because of the relationship between residual magnetism, the magnetic properties of magnetic conductors are getting worse.