With the development of intelligent electrical equipment

analysis on equipment effectiveness helps to achieve reliability centered maintenance(RCM)and economic operation of the substation. Based on a study of the weapon system effectiveness evaluation method

the effectiveness of secondary equipment is evaluated. By using the availability

dependability

capability(ADC)effectiveness evaluation method

a quantitative model based on the three indices of secondary equipment during operation is developed. And the inherent ability index system of secondary equipment is established by extracting indicators from the board level. Thus the secondary equipment effectiveness evaluation model is built. Finally

the model is verified through an analysis of the typical secondary equipment of the smart substation(merging unit). This work is supported by China Southern Power Grid Company Limited(No. K-ZD2014-011).