Development of local terminal unit applied to the intelligent reconstruction of GIS control cabinet

This article focuses on the problem of complex electrical interlocking circuit loop connections, large space occupied by relays, inconvenient installation and maintenance, and poor system flexibility in GIS control cabinet. A local terminal unit is developed, which integrates interlocking, measurement and control, intelligent terminals, merging units, and online monitoring functions. Hardware and software systems have been designed in this paper. It can optimize the interlocking circuit, elements, and secondary circuit loop, save the investment, and improves the reliability and digitization of the entire secondary circuit loop, so that can be promoted and applied in the GIS control cabinet intelligent reconstruction.