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Digital Energy
Multilin
345 Transformer Protection System
Chapter 1: Introduction
Overview
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
Introduction
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 over-
current elements. The 345 relay has a small footprint and is withdrawable for easy
mounting into either new or retrofit installations. The combination of proven hardware,
advanced features, and communications, makes the relay superior for total transformer
metering, monitoring, protection and control. Equipped with serial (RS485), USB, and
Ethernet ports, as well as a wide selection of protocols such as Modbus, DNP3.0, IEC60870-
5-103, 60870-5-104, IEC 61850 GOOSE, the 345 relay is the best-in-class for either MCCs,
SCADA or inter-relay communications. The 345 provides excellent accessibility and
transparency with regard to power system conditions and events, through both its four-
line 20 character display, and the EnerVista SR3 Setup program. Conveniently located LEDs
indicate the relay status, pickup, operation, and alarm events, as well as the status of each
winding breaker.
The 345 relay provides the following key benefits:
•
Withdrawable small footprint – saves on rewiring and space.
•
Multiple protection groups with the flexibility to switch through a wide selection of
main and backup transformer protections and controls.
•
Fast setup (Quick Setup) menu for power system configuration and protection.
•
Large four-line LCD display, LEDs, and keypad
•
Multiple communication protocols and simultaneous access with easy integration into
monitoring and control systems.
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