System design of current transformer accuracy tester based on ARM

In order to test a current transformer (CT) on site, a new portable intelligent accuracy tester system is presented. Based on the Low-voltage reciprocity principle, a new method to test current transformers, this system measures the internal parameters of a current transformer. The relevant properties such as composite error, excitation characteristics and 10% error curve are deduced. General design ideas for using the microprocessor ARM (S3C2440A) as the CPU core and the embedded Linux operation system as the core of software are introduced. The accuracy of the system is increased by the application of digital filtering technology. The deployment of this instrument would greatly facilitate field calibration of current transformers.