This paper has carried on deep analysis and studies to various kinds of capacitive current calculation methods of resonance ground system and compensation principles of arc-suppressing coil, and has pointed out the error that they exist in theory and the necessity of reducing the error. On this basis, the paper has studied and put forward the new method to improve the precision of capacitive current calculation and arc-suppressing coil compensation emphatically, and has reasoned out the corresponding calculation formula. Through the application in the real device, it proves that the new method has made the good result. The paper has also analyzed the influence the high-voltage side fault and asymmetrical fluctuation of load to the judgment of capacitive current change of resonance ground system, and has put forward the method, which judges to capacitive current change accurately. Finally, the paper introduced the automatic tracking compensation device of arc-suppression Coil with TSC that author participate in researching and developing, and put forward the solution to the problem existing while operating actually. Shaojian(Power System and Its Automation) Directed by prof. Xu Yuqin

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