Research on Lightweighting of Secondary Cables Over Door in Instrumentation Room of Segmented Isolation Cabinet

In order to solve the problems such as cable not easy to bundle and difficulty to open and close the instrument room door caused by too much secondary cables passing through the instrument room of intelligent miniaturized switchgear cabinet, this paper takes the secondary wiring diagram of intelligent miniaturized longitudinal rotary/shift-open sectional isolation cabinet installed in 220kV substation of a certain place as an entry point, analyzes the signal categories, connection methods, signal flow direction among different types of intelligent electronic device (IED), sensors and other components with the terminal internal wiring mode of the instrumentation room. Under the condition of keeping the function of the wiring diagram unchanged and conforming to the wiring regulations, the optimized design of the secondary cable of the instrumentation room door line of the switchgear cabinet is completed by adjusting the space arrangement of the IED and terminals, optimizing the redundant junction, and integrating the design of parts and components by other technical means. After optimization, the total number of secondary cables in the instrument room of the sectional isolation cabinet is reduced from 181 to 97, and the overall optimization rate reaches 46%. This research result can provide reference for intelligent miniaturized switchgear cabinet secondary cable lightweight design.