Abstract
This paper analyzes the problems of the relay protections and secondary circuits of traditional substations, and introduces the hierarchical protection and control system of smart substations based on the technologies like IEC 61850 Standard, electronic instrument transformer, process level network, and wide area optical fiber communication network, etc. The hierarchical protection and control system includes three levels: local area protection, substation area protection and control, and wide area protection and control. These three levels are combined to solve the problems of the relay protections in traditional substations, thus improving protection performance and control capability of the system.
Highlights
In the 21st century, the smart grid has become a common choice for electric power industry with the energy and CrossCheck date: 23 September 2014Under the construction of smart substation, relay protection technology is undergoing a thorough and extensive reform
Digitalized protection device receives the digital quantities of sampling values sent by the merging units of electronic instrument transformers through sample value (SV) communication interface, and the sampling of current and voltage is completed in electronic instrument transformers; the tripping command of digitalized protection device is sent to the intelligent breaker control of intelligent circuit breaker through optical fiber interface to trip and close the breakers
The communication technology is important for the development of relay protection technology
Summary
In the 21st century, the smart grid has become a common choice for electric power industry with the energy and CrossCheck date: 23 September 2014. This reform takes digitalized protection as the main solution, and includes instrument transformers and secondary circuits besides protection device itself [4]. The application of electronic instrument transformers (and their merging units) and intelligent primary equipment (and its intelligent breaker control) has realized the digitalization of protective sampling and tripping, and improved the optical fiber application, digitalization, networking and even intelligentization of substation secondary circuits [5,6,7]. Optical fiber Ethernet provides a condition for substation protection equipment to share current and voltage sampling values, state signals, and tripping and closing signals, the development of wide area communication technology even makes it possible for all protection equipments inside local grid to share information with functions meeting requirements. Based on the present relay protection and related communication techniques of smart substation, this paper analyzes problems in relay protection for traditional substation, and puts forward a new hierarchical protection control system of smart substation
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