Improvement of algorithms for voltage circuits fault detection in relay protection terminal of 6-35 kV electrical networks

Abstract

Issues of increase of consumer power supply reliability by prevention of protection device false operation and unreasonable tripping of the protected network element at malfunction of measuring voltage transformer secondary circuits are considered. Options for implementation in relay protection microprocessor terminals of advanced blocking algorithms in case of voltage circuits fault are proposed.

Modeling of operating modes of relay protection in electrical networks with insulated neutral

“…This problem consists in the fact that there are no clear instructions for solving this problem in the electrical installation rules. The 2-35 kV electrical networks can be provided both with an insulated neutral and with a neutral earthed through an arc suppression reactor or a resistor [5][6][7]. The aim of this work is to study relay protection and automation in networks with insulated neutral, to identify additional criteria for choosing the type of earthing.…”