In order to improve the reliability and accuracy of a current transformer
thereby enhance the power system safety
stability and economical operation
the influences of shunt resistor
secondary current and disturbed electromagnetic field on LPCT’s accuracy were analyzed
and some measures were proposed to improve the accuracy of the transformer.According to the theoretical analysis
a 10 kV low power electronic current transformer was developed and tested.The test results show that the transformer exactly meets the accuracy requirements of IEC 60044-8 0.2 class for measuring current transformers and 5P20 class for protection.