ADAPTIVE COORDINATION FOR POWER SYSTEM PROTECTION: ISSUE & BENEFITS

This paper deals with protection of power system network using adaptive relaying system. A number of protective relays and equipments are required to protect a power system network. Each protective relay in the network needs to be coordinated with relays protecting the adjacent equipment. The coordination of protective devices in power system network is very complicated. It is almost impossible to obtain a protection setting that can satisfy the coordination between all adjacent relays in a power network. Adaptive relaying means changing relay settings and relay pick up currents in online mode as operating conditions of the system changes. The system changes may be load and generation level changes or line and transformer outages. Advancement in technology using microprocessors have led to many improvements in protection systems like lower installation and maintenance costs, better reliability, improved protection and control, and faster restoration of outages