The current transformer is an instrument

The current transformer is an instrument that converts the primary side large current into a secondary side small current according to the principle of electromagnetic induction. The current transformer consists of a closed core and a winding. It has a small number of turns on the primary side winding, which is in the line of the current that needs to be measured.

Therefore, it often has all the current flowing through the line, and the number of turns on the secondary side is relatively large, which is connected in series between the measuring instrument and the protection circuit. When the current transformer is working, its secondary side circuit is always closed, so the measurement The impedance of the series coil of the instrument and the protection circuit is small, and the working state of the current transformer is close to the short circuit. The current transformer is to measure the large current on the primary side into a small current on the secondary side, and the secondary side is not openable.

Application of current transformers

The current transformer is one of the main electrical equipments of the substation. It mainly provides the secondary current for protection and measurement. The primary side is connected to the primary high-voltage equipment, and the secondary side is connected to the secondary equipment. It not only enables the measurement instrument and relay protection. The secondary electrical equipment is effectively isolated from the high-voltage electrical equipment to ensure the safety of the workers. It can also standardize and miniaturize the measuring instruments and relays, and can use long-distance wire and cable for long-distance measurement; When disconnected, the current transformer also protects the current coil of the measuring instrument from large currents.

For more information,please cantact us at sales@xfullstar.com