A new adaptive PMU based protection scheme for interconnected transmission network system

Calamitous loss due to mal-operation of traditional backup protection system (i.e. third zone of distance protection relays) was the main cause of many cascaded trips in the system. Some defensive system are needed to trip such failures in the power system, so, this paper is based on novel wide area backup protection system using Phasor measurement units (PMU) as an alternate to the conventional distributed backup protection in substation. Synchronized Measurement technology is a key element and empower the wide area protection, control and monitoring system. Working of Phasor measurement unit is based on GPS system and it gives accurate verdicts. In this system, overall communication is done through optical fiber. And it is expected that wide area protection, control and monitoring (WAPCAM) system reduce the number of disastrous blackouts and improve the reliability and security of the power system. The new backup protection system is based on phasor measurement unit obtained from studies on five bus test system using Matlab Simulink.