What's the difference between voltage transformer and current transformer?
1, structure, the primary winding of current transformer is thick, generally one turn or several turns, while voltage transformer belongs to step-down transformer, with more primary windings and less secondary windings.
2, the working principle, the secondary circuit of current transformer is always closed, can't open, but can be short-circuited, voltage transformer is just the opposite.
What is a current transformer?
Its principle is based on the principle of electromagnetic induction, which consists of a closed iron core and windings. The number of turns in the primary winding is relatively small, so all the current in the circuit will flow, and the number of turns in the secondary winding is directly connected to the tester loop. During the working process, the secondary loop is closed, so the resistance of the series coil of the measuring post loop is very small, so the current transformer is basically short-circuited when working.
What is a voltage transformer?
The working principle of this kind of transformer is very similar, which changes the voltage of the line, but the transformer changes the voltage to transmit electric energy, so the capacity is very large, usually in kilovolts, ten thousand symbols and other units. The function of voltage transformer is to measure and supply power to relay protection devices, generally measuring voltage, power or electric energy, and also protecting equipment, motors or transformers in case of line failure, so the capacity of voltage transformer is relatively small, usually only a few volts.
Summary: The above is a brief introduction to the knowledge of current transformer and voltage transformer, hoping to provide you with some simple understanding.