SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE 1-1
SR3 Series Protective Relay Platform
Chapter 1: Introduction
GE
Grid Solutions
Introduction
The Multilin 3 Series protective relay platform includes three different relays, the 350, 345,
and 339. Information in this manual applies to all 3 Series relays unless otherwise
indicated.
The 350 is a microprocessor-based relay for primary and backup overcurrent protection of
medium and low voltage distribution feeders. The relay is also suitable for providing
overcurrent and backup protection for small and medium size motors, transformers,
generators, and distribution bus-bars.
The 345 is a microprocessor-based relay for primary and backup protection of small to
medium size distribution transformers. The relay provides advanced algorithms for
automatic magnitude and phase compensation for more than twenty types of two-
winding transformers, good sensitivity for the detection of winding ground faults, and the
flexibility to set any of the phase, ground, neutral and negative sequence currents
overcurrent elements.
The 339 Motor Protection System is a microprocessor based relay providing suitable
protection of medium voltage motors. The basic protection functions of this relay include
motor thermal model, time-delayed and instantaneous overcurrent, ground overcurrent
and sensitive ground overcurrent protection. Additional control features such as logic
control are available for applications that require additional motor control functionality.
Communications interfaces
Each 3 Series relay has three communications interfaces. These can be used
simultaneously:
• RS485
•USB
•Ethernet
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