Multilin 350

Overview

The Multilin 350 is a member of the Multilin 3 Series protective relay platform designed for the protection, control and management of feeders or related applications as a primary or backup protection device and is used for low, medium and high voltage applications. The relay provides integrated arc flash detection using light sensors supervised by over current, and offers integrated arc flash mitigation via zone inter-tripping, flex curves and multiple elements and setting groups. Protection functions include comprehensive current, voltage and frequency elements, Directional Power and Wattmetric Ground Fault, a wide variety of protection curves, Synchrocheck, Cold Load Pick Up (CLP), 2nd Harmonic Blocking, Breaker Failure, Lockout, autoreclose and breaker overload elements. The device includes sixteen logic elements for programmable control, 10 contact Inputs with programmable thresholds, 2 Form A outputs for breaker trip and close with coil monitoring, 5 Form C output relays, a 4 line display, 12/10 LED indicators and programmable LED indicators, and is offered in drawout or nondrawout constructions with removable terminals. Monitoring and diagnostic capabilities include comprehensive metering, Event Recorder: 256 events (1ms time stamping), programmable oscillography up to 32 samples per cycle and digital states and Fault Report, relay health diagnostics, breaker monitoring and CT/VT supervision, trip/close coil monitoring and advanced device health diagnostics. Communications and time features include a front USB and a rear RS485 port, optional rear Ethernet Fiber and Copper ports, two rear Fiber ports for PRP and HSR redundancy (IEC 62439-3), Link Loss Alert (LLA), and time synchronization via SNTP, IRIG-B or IEEE 1588; supported protocols include IEC 61850, IEC 61850 GOOSE, DNP 3.0, Modbus RTU, Modbus TCP/IP, IEC 60870-5-103, IEC 60870-5-104, PRP & HSR (IEC 62439-3), Link Loss Alert (LLA), OPC-UA and IEEE 1588. The 350 relay chassis used with a draw out relay is available separately and the draw out relay with no chassis is available to order as a spare unit. The 350 is used to perform advanced feeder protection, control and monitoring as a primary or backup protection device across low, medium and high voltage applications. Explicit applications include primary protection and control for medium and high voltage utility and industrial overhead or cable feeder applications, protection of small and medium size distribution transformers, back-up protection of various HV applications, and capacitor bank protection. The relay also supports advanced control applications such as Cold Load Pickup, multi-shot recloser and multiple setting groups.