Accurately calculating the capacitance current is the application base of the arc suppression coil automatic tracking compensation device. This paper uses a simple and practical method of calculating the capacitance current of arc suppression coil with damping resistance. This method only needs to solve the capacitor current by cutting the damping resistance of the arc suppression coil grounding system. Automatic tracking compensation device based on multi-core controllers is developed. Multi-core finishes labor division to complete the automatic tracking compensation device complex tasks, which avoids the cumbersome design of traditional compensation device that requires a number of controllers. This paper specifically describes the functions of each control kernel and builds the IEC61850 model of arc suppression coil automatic tracking compensation device. The experimental test meets the IEC61850 conformance requirements and the capacitor current compensation has good accuracy. This work is supported by Science and Technology Project of State Grid Shandong Electric Power Company (No. 520609170005).