Based on elements of phenomenon of electromag induction,the analysis of phenomenon of mutually split lead allure and wring in 220 kV transmission lines,releted to its actual conditions,and going on computation,looking for the cause of forming the condition,and bring measures of ameliorate.

The verification and analysis of test methods for the determination of bond strength of the impregnating agents with the twisted coil;

This paper studies the effect of the preparation processes and break ways on the bond strength of the impregnating agents with the twisted coil during the verification of IEC 61033 in order to establish our corresponding national standard.