A new electromagnetic current transformer for EHV power systems

A new current transformer aimed at monitoring for purpose of protection and control of EHV power systems and based on the application of a microwave YIG-tuned transistor oscillator as a sensor is suggested. The principle of operation, description of the experimental system, and experimental results of the laboratory and field tests are presented. It is found that the concept of remote monitoring of the EHV system by this electromagnetic current transformer is technically and economically fully feasible.