POWER SYSTEM - SIMULATOR . FOR DYNAMIC TESTING OF PROTECTIVE RELAYS

Abstract

The standardization of PCs, their economical cost and the availability of software and hardware support, a PC based relay test scheme enables comprehensive testing of relays, quite accurately and in short time. This dissertation work presents the design and development of a personal computer based scheme for testing protective relays. Very precise and comprehensive testing of relay is very necessary to insure that the protective system always operates reliably on faults. The test procedure simulates realistic relaying signals corresponding to dynamic state operating conditions. Single-phase relay testing scheme has been developed. Over-fluxing relay and mho relay testing are chosen as typical examples for implementing this scheme. Complete software is written using C++ language, for making characteristic plots, graphics has been used. On-line parameters display and plotting are the key features of this scheme.