What is a current transformer? What are the functions of current transformers? What are the classifications of current transformers?
The principle of current transformer is based on the principle of electromagnetic induction. The current transformer consists of a closed core and windings. A winding turns its little string in the current need to measure the line, so it is often line all current flows, two times the number of windings are more connected in series of measuring and protection circuit, current transformer in operation, the 2 loop it is always closed. Therefore, measuring and protecting circuit impedance in series with the coil current transformer is very small, close to the working state of short circuit.
Classification of current transformers
By way of installation
Through current transformer. A current transformer used to pass through a screen panel or wall.
Strut type current transformer. A current transformer mounted on a plane or support and serving as a conductor for a circuit. Sleeve type current transformer. A current transformer without a conductor and an insulation directly fitted to an insulated cannula.
Bus type current transformer. A current transformer that has no conductor but is insulated once and is directly fitted to the bus.
Divided by usage
Measuring current transformer (or measuring winding of current transformer). In the normal operating current range, the current information of the power grid is provided to the measuring and measuring devices.
Protective winding of protective current transformer (or current transformer). In the state of power grid fault, the fault current information of power grid is provided to relay protection devices.
Dry current transformer by insulating medium. Insulated from ordinary insulating material by dipping paint.
Pouring type current transformer. A current transformer molded with an epoxy or other resin mixture.
Oil immersed current transformer. Insulated paper and insulating oil as insulation, usually outdoor type. At present, our country is commonly used in various voltage levels.
Gas insulated current transformer. The main insulation consists of gas.
According to the principle of current transformation
Electromagnetic current transformer. Current transformer based on electromagnetic induction principle to realize current conversion.
Photoelectric current transformer. The current transformer based on the principle of photoelectric transformation to realize the current transformation is still under development.
What is the function of current transformer?
In order to ensure the safe and economic operation of power system, the running condition of the power equipment must be monitored and measured. But the direct access of measurement and protection device is not generally a high pressure equipment, and need a large current system into small current scaling, supply measuring and protection device.
In the current measurement of alternating current, for two instruments need to be converted to current unified (the provisions of China two times rated current transformer for 5A or 1A), the voltage on the line is as high as the direct measurement is very dangerous. The current transformer plays a role of variable current and electrical isolation. It is the sensor in power system measuring instrument, relay protection, two devices to obtain information of a circuit of electrical current, current transformer high current into low current proportion, a current transformer is connected in a system, the two side connected measuring instrument, relay protection etc..
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