Application Analysis of Current Transformers

1. What is a current transformer?

The CT current transformer is very similar to the transformer. The transformer is on the line, mainly used to change the voltage of the line, and the current transformer is connected to the line, mainly used to change the current of the line, so the current transformer was also called the current transformer in the past.

Later, the equipment that generally converts direct current into alternating current is called a converter, and an electrical appliance that changes the magnitude of the current on the line is called a current transformer according to its working principle of passing through the transformer.

2. Why do you need a current transformer to change the current on the line?

This is because according to the different conditions of power generation and electricity consumption, the current on the line is different in magnitude, and the difference is very different. Some are only a few amps, and some are tens of thousands of amps. To directly measure these large and small currents, it is necessary to make many ammeters and other electrical appearances that vary from a few amperes to tens of thousands of amperes according to the size of the line current. This will bring great difficulties to the appearance production.

If the current transformer is connected to the line to change the current, then the large and small currents on the line can be uniformly changed into currents near the size according to different proportions. As long as a current standard electrical surface is used, such as a general-purpose electrical surface with a current of 5A, the current of several amperes to tens of thousands of amperes on the line can be measured through the current transformer.

At the same time, the basic structure of the current transformer is very similar to that of the transformer. It also has two windings, one is called the primary winding or primary winding; the other is called the secondary winding or secondary winding. There is insulation between the two windings to provide electrical isolation between the two windings.

When the current transformer is running, the primary winding W1 is connected to the line and the secondary winding W2 is connected to the electrical appearance. Therefore, when measuring the current on the high-voltage line, although the primary side voltage is high, the secondary side voltage is very low, and the operator and appearance are very safe.

It can be seen that the CT current transformer can not only change the current of different sizes on the line into a current of a certain size for the convenience of measurement, but also play a role in insulating the line to ensure the safety of operators and appearance.

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