The overheat faults of the transformer equipment conductive circuit in Changde Power Grid are analyzed comprehensively to understand the distribution and features of the faults. According to the classical contact resistance theory in the electrical contact theory

the cause of the overheat equipment is analyzed by considering the terminal design

the bus-bar

and the installation specification of the transformer equipment. On the basis of the experience about operation and maintenance as well as the corresponding specifications

some precautionary measures are offered to the management of substation equipment maintenance and repair

such as replacing the screw contact by screw-hoop type wiring board

adopting composite copper/aluminum transition piece for the copper and aluminum butt contact

replacing the static contact ring of the screw-fastened joint by hoop-type contact

conducting loop resistance test in routine condition-based maintenance

performing on-site electric plating of finger（head）silver layer

and using a torque wrench for tightening acceptance.