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Multilin 350
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Grid Solutions Multilin 350 Intuitive and Innovative Feeder Protection The Multilin™ 350 is a member of the Multilin 3 Series protective relay platform and has been designed for the protection, control and management of feeders or related applications as a primary or backup protection device. This cost-effective protective device is used to perform advanced feeder protection, control and monitoring in a drawout or non-drawout design for low, medium and high voltage applications. The 350 also offers enhanced features such as metering, monitoring and diagnostics, preventative maintenance, advanced communications and security. Protection and Control • Comprehensive current, voltage and frequency protection functions • Directional Power and Wattmetric Ground Fault • Wide variety of protection curves • Synchrocheck, CLP, 2nd Harmonic Blocking, Breaker Failure and Lockout functions • Cost-effective and flexible protection and control for utility and industrial applications • Integrated arc flash protection • Field-proven algorithms and reliable protection to avoid unwanted trips or under-protection • Ease of use and standardization with one-step setup and universal CT inputs • Environmental monitoring system to monitor operating conditions and plan preventative maintenance • Comprehensive metering • Advanced power system and switchgear diagnostics • Event Recorder: 256 events (1ms time stamping) • Flexible communications with multiple ports and protocols allowing seamless integration • Programmable oscillography and Fault Report • Integrated arc flash detection using light sensors supervised by over current to reduce incident energy and equipment damage • Relay health diagnostics • Arc flash mitigation via zone inter-tripping, flex curves and multiple elements and setting groups • Powerful security and hierarchical password control for centralized management • Application flexibility with the use of programmable logic elements • Drawout design simplifying, commissioning and maintenance, thereby increasing process uptime • Increased network availability with zero failover time through IEC® 62439-3 PRP and HSR support • Precise time synchronization through IEEE® 1588 (Precise Time Protocol (PTP)) support • Robust design exceeding industry standards, with Automotive Grade components and advanced testing procedures such as accelerated life cycle testing • Simplified migration of legacy MII Family relays to the 3 Series platform Applications • Primary protection and control for MV and HV utility and industrial overhead or cable feeder applications • Breaker monitoring and CT/VT supervision • Security and password control • SNTP, IRIG-B or IEEE 1588 time synchronization Communications • Front USB and rear serial, Copper/Fiber Ethernet and dual port options for seamless redundancy (IEC 62439-3, PRP and HSR) • Multiple communication protocols including IEC 61850, IEC 61850 GOOSE, Modbus® TCP/ IP, Modbus RTU, DNP 3.0, IEC 60870-5-104, IEC 60870-5-103 and OPC-UA (IEC 62541) • Protection for distribution transformers of various sizes and voltage levels EnerVistaTM Software • Back-up protection for various HV application and capacitor bank protection • Simplified setup and configuration • Advanced control applications including Cold Load Pickup, multi-shot recloser and multiple settings groups • Strong document management system • Protection, control and monitoring of LV Incoming feeder providing flexible communications and eliminating the need for auxiliary equipment • Full-featured monitoring and data recording • Protection against corrosion and humidity required for harsh environments

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The 350 relay is a member of the 3 Series family of Multilin relays. This protective device is used to perform primary or back-up circuit protection on medium or high voltage feeders or transformers and downstream protection for utility and industrial switchgear. The 350 can be used for a wide variety of protection applications in power systems such as HV/MV or MV/LV transfomer protection or capacitor bank protection. Drawout & Non-Drawout Construction The basic protection provided by this relay includes multiple phase, ground, and neutral time and instantaneous overcurrent elements for...

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Functional Block Diagram The variety of order code selections satisfies the need for various applications from single-function Current or Voltage protection to multi-function including Power and Directional elements. METERING TRANSIENT RECORDER EVENT RECORDER FAULT REPORT ANSI Device Numbers & Functions ® 61850 LOGICAL DESCRIPTION NODE PVPH RSYN psseqPTUV phsPTU auxPTUV PDOP ndPDOP Volts per Hertz Synchrocheck Positive Sequence Undervoltage Phase Undervoltage Auxiliary Undervoltage Directional Power Wattmetric Ground Fault Broken Conductor PTTR Thermal Overload ngseqPIOC Negative Sequence...

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Broken Conductor (I1/I2 OR 46BC) The Broken Conductor detection function detects a line broken conductor condition or a single-pole breaker malfunction condition through checking the phase current input phasors and the I_2 / I_1 ratio. Voltage and Frequency Protection (27P/X/_1, 59P/59X/N/_2, 81O/U) Overvoltage and Undervoltage elements provide protection for voltage sensitive equipment as well as control for permissive functions and source transfer schemes. Synchronism Check The Synchrocheck element monitors the connection of two parts of the circuit by the close of a breaker. This element...

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identify the fault and issue a trip command to the associated breaker(s) thereby reducing the total incident energy and minimizing resulting equipment damage. Self-monitoring and diagnostics of the sensors ensures the health of the sensors as well as the full length optical fiber cables. Programable LEDs on the front panel display of the 350 can be configured to indicate the health of the sensors and its connections to the relay. the 350 supports both point and loop sensors which are suitable for a particular compartment or the entire busbar section of a MV or LV switchgear. Same input...

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Multilin 350
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