Multilin 350 Intuitive and innovative feeder protection system
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.
Cost-effective and flexible protection and control for utility and industrial applications
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
Advanced power system and switchgear diagnostics
Flexible communications with multiple ports and protocols allowing seamless integration
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 simplifies, 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
Intuitive configuration software and user-friendly logic configuration tool
Primary protection and control for medium and high voltage distribution utility and industrial overhead or cable feeder applications
Protection of small and medium size distribution transformers
Back-up protection of various HV applications
Capacitor bank protection
Advanced control applications including Cold Load Pickup, multi-shot recloser and multiple setting groups
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
Cold Load Pick Up
Breaker failure, overload
Protection & Control
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 down stream 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 transformer protection or capacitor bank protection. The basic protection provided by this relay includes multiple phase, ground, and neutral time and instantaneous overcurrent elements for coordination with upstream and downstream devices. Additionally, the device provides essential feeder control features such as cold load pick up blocking, 2nd harmonic blocking, breaker failure, synchrocheck and autoreclose.
The robust 350 streamlines user work flow processes and simplifies engineering tasks such as configuration, wiring, testing, commissioning and maintenance.
Sixteen logic elements available for applications such as manual control, interlocking and peer to peer tripping.
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
Security and password control
SNTP, IRIG-B or IEEE 1588 time synchronization
Power System Troubleshooting
Analyze power system disturbances with transient fault recorder and event records
Metering, Monitoring & Diagnostics
IEEE 1588 (Precise Time Protocol) and IRIG-B:
IEEE 1588 synchronizes time between different nodes on an Ethernet network when precise time synchronization is required, and IRIG-B allows time stamping of events to be synchronized among connected devices within 1 millisecond.
Trip/Close Coil Monitoring
The 350 can be used to monitor the integrity of both the breaker trip and closing coils and circuits. The supervision inputs monitor both the auxiliary voltage levels, while the outputs monitor the continuity of the trip and/or closing circuits, by applying a small current through the circuits.
The 350 continually monitors ambient temperature around the relay and alarms when device is exposed to extreme temperatures.
Advanced Device Health Diagnostic:
These diagnostic tests monitor for conditions that could impact and present device status via SCADA communications and front panel display.
Front USB and rear serial, Ethernet, fiber and dual port options for seamless redundancy (IEC 62439-3, PRP & HSR)
Multiple communication protocols supporting industry leading standards
The 350 incorporates the latest communication technologies, making it the easiest and the most flexible feeder protection relay for use and integration into new and existing infrastructures. The 350 relay provides the user with one front USB and one rear RS485 communication port. Also available with the 350 is a rear communication port with Ethernet Fiber and Copper. For configurations requiring PRP and HSR redundancy protocols, the 350 provides two rear Fiber ports. Through the use of these ports, continuous monitoring and control from a remote computer, SCADA system or PLC is possible.
The 350 provides optional Parallel Redundancy Protocol (PRP) and High Availability Seamless Ring (HSR) according to the IEC 62439-3 standard that defines two protocols to increase network availability by reducing failover time to zero. Both ports are capable of simultaneously supporting the following protocols: Modbus TCP/ IP, IEC 61850, DNP3 or IEC 60870-5-104, IEEE 1588, SNTP and OPC-UA.
The 350 supports popular industry-leading standard protocols enabling easy, direct integration into electrical SCADA and HMI systems. The protocols supported by the 350 include:
IEC 61850 GOOSE
PRP & HSR (IEC 62439-3)
IEEE 1588 for time synchronization
Example of redundant HSR and PRP Architecture
Redundancy protocols can be used for various networking architectures including combined PRP / HSR technologies.
The EnerVista suite is an industry leading set of software programs that simplifies every aspect of using the 350 relay. The EnerVista suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate the information measured into DCS or SCADA monitoring systems. Convenient COMTRADE and sequence of event viewers are an integral part of the 350 set up software and are included to ensure proper protection and system. Learn More
Multilin devices and relays are designed with simple but powerful security to enable reliability and compliance for virtually any project or implementation. Password security is an optional feature of the 3 Series which can be setup using the SR3 EnerVista Setup software. The password system has been designed to facilitate a hierarchy for centralized management. This is accomplished through a Master level access password which can be used for resetting lower level access passwords and higher level privileged operations.
Auditing and Reporting
With the Security Audit Trail reporting feature, available in GE’s ViewPoint Monitoring software, operators are able to obtain Event logging reports of key activities such as configuration changes. These pre-formatted reports can be used to help ensure device and protection system integrity and perform forensic auditing of activities and changes for compliance.
Trace any setting changes with security audit trail.
4 line display for easy viewing of key data
12/10 LED indicators for quick diagnostics
Programmable LED indicators for specific targets
Draw out or non draw out design options
Inputs and Outputs
The 350 features the following inputs and outputs for monitoring and control of typical feeder applications:
10 contact Inputs with programmable thresholds
2 Form A outputs for breaker trip and close with coil monitoring and 5 Form C output relays
Drawout & Non-Drawout Construction
The 350 is offered in both a drawout or a nondrawout construction. In the drawout case design the 350 simplifies installation and improves site safety as the need to open switchgear doors or rewire the device after testing is eliminated.
Application Flexibility & Ease of Wiring
Removable terminals ease wiring and in-system
testing or troubleshooting.
Retrofit Existing Multilin MII Family Devices
Traditionally, retrofitting or upgrading an existing relay has been a challenging and time consuming task often requiring re-engineering, panel modifications and re-wiring. Similar features and form factor of some models of MII family devices allow users to replace their existing relays with 3 Series relays with enhanced protection and control features and advanced communications.
The SR3 Enervista Setup software allows users to create new setting files based on existing MIFII and MIVII setting files and can be uploaded to a 350 relay with a compatible model number. Retrofit is smooth and simplified with minor wiring or switchgear modifications.