Performance of distance protection of e.h.v. feeders utilising shunt - reactor arrangements for arc suppression and voltage control

Digital techniques for modelling the faulted response of any arbitrary linear shunt-reactor compensated e.h.v. transmission-line system are described. The methods are specifically developed to meet the requirements of offline or programmable test-equipment-based feeder-protection studies. The essential differences in the faulted response of single and 3-section feeders are established by reference to 500 kV interconnections involving 4-reactor linear, shunt compensators. An extensive study of modern distance protection applied to various feeder configurations is reported and the paper concludes with an evaluation of protection performance in a typical sectionalised interconnector of length 550 km.