Main performance of split core current transformer

Main performance of split core current transformer:

Split core current transformer mainly cooperates with relay device. When short circuit, overload and other faults occur in the line, it provides signal to relay device to cut off the fault circuit to protect the safety of power supply system. The working conditions of protective micro current transformer are completely different from those of measuring transformer. The protective transformer only starts to work when the current is several times or dozens of times larger than the normal current.

Main requirements of protective transformer:

1. Reliable insulation,

2. Sufficiently large accuracy limit coefficient,

3. Sufficient thermal stability and dynamic stability.

Split core current transformer can meet the accuracy level requirements under rated load. The large primary current is called rated accurate limit primary current. The accuracy limit coefficient is the ratio of rated accurate limit primary current to rated primary current. When the primary current is large enough, the core will be saturated and cannot reflect the primary current. The accuracy limit coefficient represents this characteristic. Accuracy level of protective transformer 5P, 10P

Split core current transformer function The transformer for power system is a special transformer that transmits the information of high voltage and large current of the power grid to the metering, measuring instruments, relay protection and automatic devices on the low voltage and small current secondary side. It is a contact element between the primary system and the secondary system. Its primary winding is connected to the power grid, and the secondary winding is connected to the measuring instrument, protection device, etc. The transformer cooperates with the measuring instrument and metering device to measure the voltage, current and electric energy of the primary system; cooperates with the relay protection and automatic device to form electrical protection and automatic control of various faults in the power grid. The performance of the transformer directly affects the accuracy of the measurement and metering of the power system and the reliability of the action of the relay protection device.