Title :
Coordination of protective relays in MV transformer stations using EasyPower protector software
Author :
Nikolovski, S. ; Provci, I. ; Sljivac, D.
Abstract :
The analysis of digital protection relays setting in a MV transformer station grounded via a low-ohmic resistor is presented. Theoretical background on low-ohmic resistor grounding in a transformer station is provided. EasyPower PowerProtector software is used for simulation and relay settings. Protective relay coordination after the simulation of a 3-phase fault and a line-to-ground fault on different selected buses in transformer station 35/10 kV is performed. Digital ABB relays series REF 541 were used for low-ohmic resistor thermal, short-circuit and overcurrent protection and overload protection of the low voltage transformer side. The results of analysis indicate correct selectivity of overcurrent protection devices in all cases.
Keywords :
fault simulation; overcurrent protection; power system simulation; relay protection; resistors; substation protection; transformer substations; 10 kV; 3-phase fault simulation; 35 kV; ABB relay series REF 541; EasyPower protector software; MV transformer stations; digital protective relays; line-to-ground fault simulation; low-ohmic resistor; overcurrent protection; overload protection; resistor grounding; short-circuit protection; thermal protection; Circuit faults; Circuit simulation; Digital relays; Fault currents; Grounding; Power system protection; Power system transients; Power transformers; Protective relaying; Resistors;
Conference_Titel :
Power Tech Conference Proceedings, 2003 IEEE Bologna
Print_ISBN :
0-7803-7967-5
DOI :
10.1109/PTC.2003.1304600
