How the Electrical Current Transformer works

In the lines of power generation, transformation, transmission, distribution and power consumption, the currents vary greatly, ranging from a few amperes to tens of thousands of amperes. In order to facilitate measurement, protection and control, it needs to be converted into a relatively uniform current. In addition, the voltage on the line is generally relatively high, such as direct measurement is very dangerous. Electrical Current Transformer plays the role of current conversion and electrical isolation.

For pointer type ammeters, the secondary current of Electrical Current Transformer is mostly ampere level (such as 5A, etc.). For digital instruments, the signal sampled is generally milliampere (0-5V, 4-20mA, etc.). The secondary current of the miniature Electrical Current Transformer is milliampere, and it mainly acts as a bridge between the large transformer and the sampling.

The mini-Electrical Current Transformer is also called the "Electrical Current Transformer". ("Electrical Current Transformer for instrument" has a meaning that the multiple current ratio precision Electrical Current Transformer used in the laboratory is generally used to expand the range of the instrument.)

Similar to the transformer, the Electrical Current Transformer works according to the principle of electromagnetic induction. The transformer transforms the voltage and the Electrical Current Transformer transforms the current. The winding (the number of turns is N1) connected to the measured current is called the primary winding (or primary winding, the primary winding); the winding (the number of turns is N2) connected to the measuring instrument is called the secondary winding (or the secondary winding) Winding, secondary winding).