Working process and use requirements of high current split core current transformer

- May 24, 2019-

When a large current split core current transformer is used to measure the large current of the alternating current, it needs to be converted into a relatively uniform current in order to facilitate the measurement of the secondary meter when it is used (the secondary rated current transformer of China is rated as 5A or 1A), the voltage on the other line is relatively high, as direct measurement is very dangerous. The current transformer acts as a variable current and electrical isolation. It is a sensor for obtaining electrical primary loop current information in secondary equipment such as measuring instrument and relay protection in power system. The current transformer converts high current into low current proportionally. The current transformer is connected to the primary system at one time, and the secondary side Connect measuring instruments, relay protection, etc.

During the normal operation of the high current split core current transformer, the secondary side of the transformer is in an approximate short circuit state, and the output voltage is very low. In operation, if the secondary winding is open or the primary winding flows abnormal current (such as lightning current, resonant overcurrent, capacitor charging current, inductor starting current, etc.), it will generate several thousand volts or even tens of thousands of volts over the secondary side. .

The high-current split-core current transformer is mainly used in conjunction with the relay device when it is used. When the line is short-circuited and overloaded during operation, it will effectively provide a signal to the relay device to cut off the fault circuit. To protect the safety of the power supply system. The working conditions of the protective current transformer are completely different from those of the measuring current transformer. The protective transformer only starts to work effectively when it is several times larger than the normal