Measures to Improve Practical Using Reliability of Protective Relaying Systems

Abstract

Protective relaying system is a very complicated system, as it consists of one or more protective equipments, instrument transformers, wiring, tripping circuits, auxiliary supplys and communication systems.
Therefore, it is necessary to take appropiate measures not to cause any weak points in the system for the practical use.
This paper presents the appreciation of the manner to preserve the reliability and security of the system. Concrete measures to improve them are also described, which have been studied based on the experiences, and used in practical systems.