The difference between current transformer and voltage transformer

Micro transformers are divided into micro current transformers (including micro current converters) and micro voltage transformers. They are equipment in the power industry and are generally used in various power instruments for measurement and protection. Compared with ordinary transformers, micro transformers have the characteristics of small size (can be as small as a fingernail) and high precision (ordinary transformers have four precision levels of 0.5, 0.5S, 0.2, and 0.2S, and micro transformers can reach 0.1 level).

Micro voltage transformer is a current type voltage transformer. The primary circuit is connected in series with a resistor and the secondary circuit is connected in parallel with a resistor. The voltage is converted into current. After the transformer performs current conversion, the primary output current signal is converted into the required voltage through the sampling resistor. Most of the micro voltage transformers are inserted into the circuit board for use.

There is no resistance on the primary side of the micro current transformer (including micro current converter). The ordinary micro current transformer is a transformer with a resistor in parallel on the secondary side, and the output is current. The micro current converter in the micro current transformer is a resistor in parallel on the secondary side, and the output is voltage. Miniature current transformers are divided into two types: multi-turn winding type (inserted into the circuit board) and through-hole type.