Secondly, on the basis of mechanism of the magnetizing rush current, the new protection principle based conversation of energy is pointed out, and its feasibility also is proved in detail.

• 紧接着在对励磁涌流产生机理进行详细分析的基础上，提出了基于能量守恒定律的新的保护原理，并对其理论基础和可行性进行了充分的论证。