350 Feeder Protection System

The 350 is a microprocessor-based relay for primary and backup over-current protection of medium and low voltage distribution feeders. The relay is also suitable for providing over-current and backup protection for small and medium size motors, transformers, generators, and distribution bus-bars. The small footprint and the withdrawable option make the 350 relay ideal for panel mounting on either new or retrofit installations. The combination of proven hardware, a variety of protection and control features, and communications, makes the relay ideal for total feeder protection and control. Equipped with serial (RS485), USB, and Ethernet ports with the possibility of adding redundancy (IEC62439, PRP and HSR), and a wide selection of protocols such as Modbus, DNP3.0, IEC 60870-5-103, 60870-5-104, IEC61850 GOOSE, OPC-UA, the 350 relay is the best-in-class for MCCs and PCCs, SCADA and inter-relay communications. The 350 relay provides excellent transparency with respect to power system conditions and events, through its four-line 20-character display, as well as the EnerVista SR3 Setup program. Conveniently located LEDs provide indication of relay operation, alarm, and pickup, as well as breaker, and relay status.

The 350 relay provides the following key benefits:

•Withdrawable small footprint – saves on rewiring and space. (non-draw out version is also available)

•Multiple protection groups with the added flexibility of switching through a wide selection of overcurrent protection and control features.

•Fast setup (Quick Setup) menu for power-system setup and a simple overcurrent protection configuration.

•Large four-line LCD display, LEDs, and an easy-to-navigate keypad.

•Multiple communication protocols for simultaneous access when integrated into monitoring and control systems.

CPU

Relay functions are controlled by two processors: a Freescale MPC5554 32-bit microprocessor measures all analog signals and digital inputs and controls all output relays; a Freescale MPC520B 32-bit microprocessor controls all the Ethernet communication protocols.