350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
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350 Feeder Protection System
Chapter 1: Introduction
Digital Energy
Multilin
Introduction
Overview
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 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, and a wide selection of protocols such as Modbus, DNP3.0, IEC 60870-5-
103, 60870-5-104, GOOSE, the 350 relay is the best-in-class for MCCs, 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:
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Withdrawable small footprint – saves on rewiring and space.
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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.
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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.