Zone 3 Relay Blocking Scheme to Prevent Cascaded Events

作     者：LIM Seong-Il 

作者机构：Department of Electrical EngineeringKyungnam UniversityMasanKorea 

出 版 物：《Transactions of Tianjin University》 (天津大学学报（英文版）)

年 卷 期：2008年第14卷第2期

页      面：97-105页

核心收录：

学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学] 

基　　金：Ministry of Science&Technology of Korea and Korea Science&Engineering Foundation Through ERC(Engineering Research Center)Program 

主　　题：blackouts cascaded events defense system distance relay Zone 3 relay 

摘      要：Defense systems are needed to prevent catastrophic failures of a power grid due to cascaded events. Cascaded events can be attributed to improper operations of protective relays. The most challenging problem for the design and implementation of a defense system is the performance in accuracy and speed in a real time environment. Protective devices are normally designed to operate fast in order to isolate the fault（s）. This paper proposes a new methodology to distinguish line overloads from actual faults for distance relays. In order to distinguish between line flow transfers from a line outage and an actual fault, the line outage distribution factor （LQDF） and generation shift factor （GSF） based power flow estimation method, and a secure peer to peer （P2P） communication structure are adopted. Computer simulations of cascaded events for a 6-bus system and the Korean power grid have been performed to establish the feasibility of the proposed scheme.