Abstract
This paper introduces the structure of the existing on-line monitoring system, and analyzes the problems of poor compatibility and reliability of IED in different manufacturers. Then it gives two ways to transform the on-line monitoring system of substation equipment to the Internet of things, which is to retain IED and to remove IED. On this basis, this paper introduces the application scenarios of the on-line monitoring system of substation equipment connected to the Internet of things, including accurate perception of equipment status, accurate evaluation of equipment status and intelligent research and judgment of equipment status.
Highlights
The on-line monitoring device of substation equipment has been widely used in the power grid system
Due to the detailed classification of monitoring functions, each type of on-line monitoring device is equipped with a monitoring IED to realize data acquisition, analysis, processing and IEC61850 communication protocol, which leads to a variety of IED types, high failure rate, false alarm and missing alarm
The composition of the current substation equipment online monitoring system is shown in Figure 1, which is composed of equipment online monitoring device, equipment online monitoring IED and station end online monitoring host (CAC)
Summary
The on-line monitoring device of substation equipment has been widely used in the power grid system. In recent years, it has experienced several stages of development, and the related technology is gradually mature, and the online monitoring products are gradually increasing. With the development of edge computing, wireless transmission and other key technologies, as well as the full deployment of ubiquitous power Internet of things, it provides favourable conditions for the wireless on-line monitoring device of substation equipment. The sensors, communication links and data analysis can be decoupled, which provides convenient conditions for the structure simplification and cost reduction of online monitoring devices
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