In order to solve the problem of establishment and practical engineering application of secondary equipment operation evaluation system for smart substation

the comprehensive evaluation model of secondary equipment based on multi-parameter information fusion is introduced. The evaluation sub-items

evaluation parameters and evaluation methods are proposed to evaluate state of different types of secondary equipment. A trend assessment model is established to characteristic health status of secondary equipment by monitoring the change of steady state quantities

while a loss assessment model is established to characterize failure degree of secondary equipments. Engineering quantification index of different evaluation sub-items are proposed. The secondary equipment health evaluation system is developed and has been applied in 500kV smart substation project.