Design of the instrument current transformer for high frequency high power applications

Abstract

Current transformers fall into a general category known as instrument transformers. The instrument current transformer safely isolates measurement and control circuitry from the high voltage typically present on the circuit being measured. The instrument current transformer can be used as very important part of the closed loop for control circuit in high power high frequency induction heating applications. Design of an instrument current transformers having a high rating of primary current and high rating of frequency is a challenging process. Normally one can get an instrument current transformers having high current or high frequency. This problem ocurs due to the physical configuration of the core. Traditionally, at high frequency shunt resistance can be used to get a signal from the primary current. This method facing many problems. For this work, our approch is to design and implementation of high frequency instrument current transformer, the primary current up to 200 A and 400 KHz. The experimental results which obtained from the presented design shows a good agreement with the theoretical results.