The difference between current transformer and Voltage transformer

Difference between transformer and Voltage transformer I. Structure difference: the primary winding of current transformer is wound with thick wire; Voltage transformer is a step-down transformer. 2、 Differences in working principles. 3、 Functional differences.

1、 Structural difference: The primary winding of the current transformer is wound with thick wire, usually only one or a few turns, in series with the load of the measured current; The Voltage transformer is a step-down transformer, which has many turns of the primary winding and is connected in parallel with the measured high-voltage power grid; The secondary winding has few turns and is connected to the voltage coil of Voltmeter or power meter.

2、 Difference in working principle: 1. The current transformer can have a short circuit in the secondary circuit, but it must not have an open circuit; The secondary of Voltage transformer can be open circuit, but shall not be short circuit. 2. The magnetic flux density of Voltage transformer is close to the saturation value when it works normally, and decreases when it fails; During normal operation, the magnetic flux density of the current transformer is very low, while during a short circuit, the primary side short-circuit current becomes large.

3、 Functional difference: In order to ensure the safe and economic operation of the power system, the current transformer must monitor and measure the operation of power equipment. The function of Voltage transformer is to convert high voltage into standard secondary voltage of 100V or lower level in proportion. The difference between the two is that one is to measure current and the other is to measure voltage.