Study on the Constraints on Integration of Digital Distribution Substation Equipment and Necessary Maintenace Adjustment

The application of digital substation technology in power distribution system provides with opportunity to deal with excessive redundancy of distribution equipment by integrating similar functions of different devices or functionally related devices into one. In this paper, integration schemes to different degrees were presented and discussed. The most suitable integration for the current engineering practice is to the plug-in unit level. Constraints of the integration are assessed from 3 main aspects, i.e. hardware reliability electromagnetic susceptibility (EMS) and communication load. Among them power of the integrated device is a key issue in the integration scheme to be considered. Finally, maintenance adjustment necessity caused by the integration is discussed and a proposal of adjustment was presented.