The Study Of Digital Substation Design

Today, automation system, monitoring, relay protection and security automation device has been applied in our country's substation. And the digital technology has also been adopted in these devices. With the development of the network communication technology, the electronic technology which can be applicable to these devices such as sensor and switch in adverse operating environment has been nearly mature. On this basis, the application of these devices such as intelligent switch and photoelectric sensor can advance to all-digital substation.Digital substation proposes the concept of substation stratified function according to the three function as conformity, surveillance and protection. The stratified function has three layers, that is substation, interval and process. The process layer accomplishes the function of the switch input and output, simulation of sampling, transmitting of control order. The interval layer control these devices using the data of itself. The substation accomplishes these functions such as control, management, scheduling and related functions of other intelligent devices.Digital substation takes IEC61850 as a standard to realize data acquisition and transmission, data processing and output. Intelligent devices, standardized modeling, network communications and automated operation and management have become the basic characteristics of digital substation.This article proposes typical design through the analysis and discussion of digital substation's basic structures. It also can promote the application of the digital substation.