Overcurrent Relay based Integrated Protection Scheme for Distribution Systems

Abstract

This paper reports on the development of integrated protection for power system. The background of the development is firstly introduced, in which a centralized protection system (or relay) provides the protection of multiple power plant or a substation. A novel integrated protection scheme for distribution system is described. The scheme is based on overcurrent protection technique, in which specially designed protection relays are installed at each substation of a network. In the proposed scheme, one integrated relay is responsible for the protection of every line sections connected to the substation busbar. The conventional directional overcurrent and new adaptive accelerated protection algorithms are implemented into the relay with multiple overcurrent settings to cover all the protected line sections. The paper includes studies of a typical multi section distribution network to demonstrate the principle of the scheme. Studies show that the new scheme not only offer the new protection features for individual power line, but also provide the characteristics of integrated protection.

A new scheme of control and protection based on utilizing phasor measurement technique

“…This has enabled techniques to be considered which were impractical in the past and encouraged interests in the new developments in the integration of control and protection. Research and development shows that information obtained from multiple power plants and components can be used to derive new control and protection principles and schemes, which could have significant advantages over the existing techniques based on individual plant or component [2][3][4] . At the same time, there have been significant developments in the field of power system control and protection.…”

Development and research on integrated protection system based on redundant information analysis

“…Reference [17] presents a new integrated protection scheme based on the overcurrent protection principle. Reference [11] presents an approach to improve the overcurrent protection by combining the adaptive current and voltage instantaneous protections.…”