A rogowski coil is a circular coil evenly wound around a non-ferromagnetic material. The output signal is the derivative of the current with respect to time. Through a circuit integrating the output voltage signal, the input current can be truly restored. The coil has the characteristics of real-time current measurement, fast response speed, no saturation, suitable for AC, especially high frequency current measurement.

A Rogowski coil, also known as a current measuring coil or differential current sensor, is a circular coil uniformly wound around a non-ferromagnetic material. The output signal is the derivative of the current with respect to time.

What are the similarities and differences of voltage and current transformers? The current transformer is called CT and the voltage transformer is called PT. What they have in common is that they work on the principle of electromagnetic induction, which is used to monitor the electrical circuit: the current of the electrical circuit is monitored through CT, which is the current source of secondary instrument and protection

Voltage transformer - according to the principle of electromagnetic induction type and capacitance type two categories. According to the purpose, voltage transformers are divided into two categories: measurement and protection.

A: The main functions of the transformer are: ① used to insulate the secondary equipment such as instruments and relays from the main circuit. ② It is used to expand the application range of instruments, electrical appliances and other secondary equipment. Voltage transformer installation: ① pay attention to the secondary side do not short circuit. ② One end of the secondary side must be grounded. ③ Pay attention to the installation of the terminal polarity current transformer: ① Do not open the secondary side. ② One end of the secondary side must be grounded. ③ Pay attention to terminal polarity

​The ring indicates the number of primary and secondary windings of the voltage transformer. One primary winding is removed, and the rest are all secondary windings.

Good gas performance, low partial discharge value: in the transformer insulation structure, how many local insulation weaknesses, it will first occur under the action of the electric field discharge, but not immediately the formation of the entire insulation penetration breakdown, it may occur on the surface of the insulator or internal, that is, partial discharge.

The design of switching power transformer is divided into three aspects: reduce the loss of switching transformer as far as possible; Minimize leakage of switching transformer; Try to suppress the audio noise of the switching transformer.