PC based relay tester

Abstract

Power quality disturbances are an issue that is gaining so much attention within the research community because of its detrimental consequences on the power grid, instruments and customers alike. Relays are the first line of defense in the face of these disturbances rendering their existence the most important in the protection scheme; relay testing is therefore just as important. This project deals with the design and implementation of a Relay Tester, which is based on the simulation of power quality disturbances and fault signals using LabVIEW environment and the generation of these signals using data acquisition card. These fault signals are amplified to the standard relay values using a Class-D amplifier. The amplified signals are injected into the relay to test its functionality.