Three phase current transformer

Three-phase combined current transformer (CCT) is a sensor that measures the current in a three-phase circuit, typically consisting of three single-phase current transformers and a phase measurement control unit. It can measure the magnitude and phase of three-phase current and output standard current signals for metering, protection, and control circuits.

The main function of the three-phase combined current transformer is to convert the current in the three-phase circuit into a standard low-level current signal. These signals can be transmitted to meters, protective relays, and controllers for monitoring and controlling the status of circuits. In addition, the CCT can also be powered by an AC power source for measuring the current in a DC circuit.

The principle of three-phase combined current transformer is the principle of current transformer. It is based on Faraday’s law of electromagnetic induction, Ampere’s loop theorem, and the working principle of mutual inductor. When an electric current passes through a coil wound around an iron core, a magnetic field is generated. When the current flowing through the coil changes, the magnetic field changes, creating an electric potential in another coil wound around the iron core.

In summary, a three-phase combined current transformer is a sensor that measures the current in a three-phase circuit. It converts the current into a standard low-level current signal for metering, protection, and control circuits. Its working principle is based on the principle of current transformers and is realized by the combination of three single-phase current transformers and a phase measurement control unit.