Relay coordination of Industrial plant

Abstract

Relay coordination is one of the integral parts of power system analysis in industrial power system. Any new
plant is being plane or existing plant load demand increases protection devices coordination is required for selective and
fast isolation of faulty section without affecting remaining area. Short circuit analysis is the pre requisite for relay
coordination as short circuit current is required for relay setting. In this paper, relay coordination of 6.6 kV industrial
plants is presented using Electrical Transient Analysis Program -7.5.5(ETAP). Symmetrical breaking current at different
nodes of power systems are used relay coordination. The plant is supplied by two existing generators of 16.5 MW and
one more generators of 11.8 MW are newly installed. Black start facilities of TG’s are provided by external grid support.
Existing load of 17.5 MW is expanded to 24 MW. Load flow analysis and short circuit study of this plant have been
conducted and it is suggested G2 and G3 configuration of generation. Therefore, protection coordination is performed
for G2+G3 configurations using ETAP.