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Multilin 869
Comprehensive Motor Protection and Management for Medium and Large Motors
869 Feeder Protection System

The Multilin 869 relay is a member of the Multilin 8 Series protective relay platform and has been designed for the protection, control and management of medium and large induction and synchronous motors.

The Multilin 869 provides advanced functionality for various types of applications such as high-speed protection, extensively customizable programmable logic, advanced motor monitoring and diagnostics, and flexible configuration capabilities.

Advanced communications of the 8 Series platform allows easy integration into process and electrical control systems for smoother asset monitoring and control.

Key Benefits
  • Comprehensive protection for medium and large induction motors
  • Advanced diagnostics with high-end fault and disturbance recording
  • Integrated arc flash detection using light sensors supervised by over current to reduce incident energy and equipment damage
  • High-end cyber security such as AAA, Radius, RBAC, and Syslog helps enable NERC CIP requirements
  • Draw-out design simplifies testing and increases process uptime
  • Supporting the latest in communication protocols and networking technology, enabling seamless system integration and interoperability
  • Optional Wi-Fi connectivity minimizes system configuration and facilitates safe relay programming and diagnostic retrieval
  • Monitored environmental conditions helps reduce system downtime

Platform Overview

The Multilin 8 Series platform delivers the highest level of quality, reliability and performance with…
Innovative Technology & Design
  • Elimination of electrolytic capacitors
  • Advanced diagnostics with unique algorithms ensuring asset protection is never compromised
  • Single set-up and configuration across the platform
  • Built-in field swappable power supply
  • Enhanced relay draw-out construction
  • Advanced and flexible communication offerings simplifying system integration
  • Embedded communications offerings including: IEC61850 Ed2, IEC62439/PRP, Modbus RTU & TCP/IP
Exceptional Quality & Reliability
  • IPC A-610-E Class 3 Manufacturing standards – highest industry standards for electronic manufacturing
  • 100% Environmental Stress Screening and full functional testing
  • Rated for IP54 applications
Uncompromising Service & Support
  • Covered under GE’s 10 year warranty plan
  • Fully designed, tested and assembled at GE facilities
Multilin 869 Overview

The Multilin 869 relay is a member of the Multilin 8 Series protective relay platform and has been designed for the protection, control and management of medium and large induction and synchronous motors.

The Multilin 869 utilizes advanced functionality enabling high-speed protection and control features, easy to use set-ups delivering faster motor configuration and startup, as well as enhanced motor health reports and motor failure analysis enabling quick and easy identification of motor issues.

Additionally, the 869 provides high performance protection, high-density I/O, extensive programmable logic and flexible configuration capabilities as well as advanced communications options including IEC 62439/PRP and IEC 61850 Ed2.

Key Applications:
  • Wide range of motor applications for oil & gas, mining & metals, cement, and water wastewater
  • Comprehensive protection and management of medium to large motors; two-speed, VFD-driven, cyclic loading and synchronous motors
  • Specific and advanced features for high inertia loads and reduced-voltage starting motors
  • Stator protection of medium to large synchronous motors where field functions are provided by excitation panels
  • Advanced predictive motor diagnostics and motor health visualization
8 Series
8 Series
Protection & Control

As part of the 8 Series family, the Multilin 869 provides superior protection and control. The 869 offers comprehensive protection and control solutions for medium and large motors for various applications. It contains a full range of selectively enabled, self contained protection and control elements.

Motor Thermal Model

Many motor failures are directly or indirectly related to, or caused by, extensive heating of the different motor parts involved in electromechanical operation.  

The flexibility of the Multilin 869 thermal models will allow proper set up and performance for applications, including high inertia and cyclic loads.

Advanced Thermal Model
Multilin 869 - Advanced Thermal Model
High inertia overload curves sample, 8500HP, 13.2kV, Reactor coolant Pump

Stator Differential

Differential protection is considered as the first line of protection for internal phase-to-phase or phase-to-ground faults for medium and large motors to provide sensitive and fast clearing protection against winding faults including turn-to-turn faults. The Multilin 869 provides two types of the stator current differential protection: Traditional Dual Slope Percent Differential and Core Balanced Differential Protection.

Multilin 869 Stator Differential
Multilin 869 Stator Differential
Two-CT set and Core-Balanced configurations

VFD-Driven Motors

The Multilin 869 provides protection for motors fed through VFDs (Variable Frequency Drives). A wide range of the frequency tracking (3-72Hz) allows the 869 to track the motor frequency and adjust its sampling rate to accurately measure phasors. An advanced algorithm allows switchable current and voltage tracking in case VFD is bypassed.

Two-Speed Thermal Model

The two-speed motor protection feature allows for the protection of motors that can operate at two different speeds and have different full load capacity levels at each speed. The Multilin 869 automatically determines which settings should be active at any given time considering a transition from speed one to speed two within a period of time. The device has all required logic and time delays to safely transfer speeds.

Integrated Arc Flash Protection

The Multilin 8 Series supports an integrated arc flash module providing constant monitoring of an arc flash condition within the switchgear, motor control control centers, or panelboards. With a 2ms protection pass, the 8 Series is able to detect light and overcurrent using 4 arc sensors connected to the 8 Series relay. In situations where an arc flash/fault does occur, the relay is able to quickly identify the fault and issue a trip command to the associated breaker 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 fiber cables. LEDs on the front panel display of the 845 can be configured to indicate the health of the sensors and its connections to the relay.

845 integrated arc flash protection
Fast, reliable arc flash protection with light-based arc flash sensors integrated within the Multilin 8 Series of protection & control devices. With arc flash detection in as fast as 2msec, the costs associated with equipment damage and unplanned downtime is significantly reduced.
Monitoring & Diagnostics

The Multilin 869 includes high accuracy metering and recording for all AC signals. Voltage, current, and power metering are built into the relay as a standard feature. Current and voltage parameters are available as total RMS magnitude, and as fundamental frequency magnitude and angle.

Data Logging

The Multilin 869 motor delivers comprehensive data logging providing the recording of 16 analog values selected from any analog values calculated by the relay. This data capture flexibility allows the operator to measure power factor or reactive power flow (for example), for several hours or even days, enabling detailed analysis and corrective action to be taken.

Advanced Motor Diagnostics

The Multilin 869 provides advanced motor diagnostics including Stator turn to turn fault and broken rotor bar detection. The broken rotor bar detection is a condition monitoring function that continuously monitors the motor's health while in operation. Using an advanced Motor Current Signature Analysis (MCSA), the 869 continuously analyzes the motor current signature and based on preset algorithms will determine when a broken rotor bar is present.

The insulation of stator windings can deteriorates due to aging or by repeated stress on the windings due to prolonged faults or some other factor. This break down in insulation creates inter-turn faults that can very quickly evolve into a major fault in other areas of the stator windings as well. If undetected, this can damage the motor & bring an entire process to a halt. The 869 uses a patented algorithm that uses the sequence components to detect stator turn failure of induction machines. Since unbalance conditions can exist in motors, the 869 uses the unbalance impedance of the machine as a reference & then monitors the phase for changes to this reference.

By providing early indication of potential rotor and stator problems, serious system issues can be avoided, such as reduced starting torque, overloads, torque and speed oscillation and bearing wear.

With fully programmable alarms, the broken rotor bar and the Stator Turn to Turn fault functions provide advanced warning and early detection of impending problems of rotor bar problems and Stator turn to turn faults, enabling maintenance personnel to schedule for predictive maintenance of the motor thereby preventing catastrophic motor failures to maximize motor life and system uptime.”

Advanced Motor Health Report

The 869 motor health report provides a quick snapshot of the motor operating and diagnostic information in an easy way to allow users to make decisions about health of the motor. Based on the graphical representation and trend values of the motor historical data gathered by the 869, users can quickly identify process issues and maintenance requirements before damage occurs and costly repairs are required.

Multilin 869 Motor Health Report

Multilin 869 Motor Health Report
Environmental Monitoring

The 869 implements a patented environmental monitoring system that measures and provides operating condition information. Reliable and secure operation of the 869 relay and other electronic devices in the vicinity may be affected by environmental factors. The 869 relay has been designed to meet or exceed all required industry standards. Some operating conditions may be beyond those standards and reduce total lifespan of the device.


The 869 provides advanced communications technologies for remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. Direct support for fiber optic Ethernet provides high-bandwidth communications, allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The 869 also supports two independent IP addresses, providing high flexibility for the most challenging of communication networks.

Providing several Ethernet and serial port options, dual independent Ethernet Ports, and support for a wide range of industry standard protocols, the 869 enables easy, direct integration into DCS and SCADA systems. The 869 supports the following protocols:

  • IEC 61850 Ed2, IEC 62439 / PRP
  • DNP 3.0, IEC 60870-5-103, IEC 60870-5-104
  • Modbus RTU, Modbus TCP/IP

The 869 has two interfaces as USB front port and Wi-Fi for ease of access to the relay. Wi-Fi Connectivity:

  • Simplify set-up and configuration
  • Simplify diagnostic retrieval
  • Eliminate personnel in front of switchgear
  • WPA-2 security
8 Series
Software & Cyber Sercurity

Software & Configuration

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the Multilin 869.

EnerVista provides all the tools to monitor the status of the protected asset, maintain the device and integrate the information measured by the Multilin 8 Series, into SCADA or DCS process control systems. The ability to easily view sequence of events is an integral part of the setup software, as postmortem event analysis is critical to proper system management.

EnerVista Launchpad

The setup tools within Launchpad allow for the configuration of devices in real-time, by communicating via serial, Ethernet or modem connections, or offline by creating device setting files to be sent to devices at a later time.

8 Series Setup Software

8 Series Setup Software is single setup and configuration tool across the platform and can reduce device setup and configuration time.

Simplified Setup & On-Going Maintenance

8 Series

Cyber Security with Radius Authentication

Cyber Security

The 869 cyber security enables the device to deliver full cyber security features that help operators to comply with NERC CIP guidelines and regulations.

AAA Server Support (Radius/LDAP)

Enables integration with centrally managed authentication and accounting of all user activities and uses modern industry best practices and standards that meet and exceed NERC CIP requirements for authentication and password management.

Role Based Access Control (RBAC)

Efficiently administrate users and roles within UR devices. The new and advanced access functions allow users to configure up to five roles for up to eight configurable users with independent passwords. The standard “Remote Authentication Dial In User Service” (Radius) is used for authentication.

Event Recorder (Syslog for SEM)

Capture all cyber security related events within a SOE element (login, logout, invalid password attempts, remote/local access, user in session, settings change, FW update, etc), and then serve and classify data by security level using standard Syslog data format. This will enable integration with established SEM (Security Event Management) systems.