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Multilin 869

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 condition-based monitoring and diagnostics with high-end fault and disturbance recording

  • Integrated arc flash detection using light sensors 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 minimizes system configuration and facilitates safe relay programming and diagnostic retrieval

  • Monitored environmental conditions helps reduce system downtime


  • Wide range of motor applications for oil & gas, mining & metals, cement, and 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

High-Inertia Load Applications

The voltage dependent overload curve feature in Thermal Model is tailored to protect motors which are used in high inertia load applications. Voltage is continually monitored when the motor is started and during acceleration. The thermal limit curve is then adjusted accordingly. This enables the Multilin 869 to distinguish between a locked rotor condition, an accelerating condition and a running condition.

VFD-Driven Motor Applications

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.

Thermal protection also considers the extra heating generated by the higher harmonics due to VFD to achieve the accurate response to the actual motor heating. RMS currents fed to the various motor protection elements are further processed through the averaging filter to eliminate oscillations in current signals to ensure the security.

Additionally, users may indicate a starting VFD frequency that helps the device to track the motor frequency faster and therefore accurately measures the phasor quantities, which, otherwise, could cause delayed or false protection operation of the protection.

Cyclic Load Motor Applications

Input currents of a motor driving cyclic load can vary between very low to above the maximum allowable current during a load cycle. Variation in current magnitude results in motor heating and cooling depending on the heat and cooling time constants. Thermal overload protection response is made adaptive to the cyclic load based on the cooling time constants. In addition, to provide more accurate overload thermal model response to cyclic load, the input currents to the thermal model are averaged over the settable duty cycle interval. With a reciprocating load application, the number of cycles to average can be determined from current waveform capture using the Oscillography/Datalogger features in the GE motor protection relays

Synchronous Motor Applications

869 provides functions essential to protect the synchronous motor during asynchronous operation while startup, during normal and overload operations and under fault conditions. In addition to stator protection and control, it provides protection and monitoring of exciting rotor during pull-out or loss of synchronism condition with elements like Out-of-Step, Loss-of-Field, Reactive Power, and Power Factor. With its well established and matured Thermal Model, it prevents overheating of both stator and rotor windings during both synchronous and asynchronous operation. During asynchronous operation or startup, the thermal model with VD (voltage dependent) function provides protection against excessive heating in the damper winding due to stalled or locked rotor conditions.

Monitoring & Diagnostics

Advanced Motor Monitoring & Diagnostics

The Multilin 869 offers an integrated, cost effective Monitoring and Diagnostics features that leveraging existing relay data without the need for additional devices, sensors, wiring or training.

  • Motor failures and faults can have a significant impact on a process, resulting in loss of revenue and material. Predictive maintenance and situational awareness to the motors operating condition can help reduce unplanned downtime and energy consumption - maximizing motor output and life.

  • Motor monitoring & diagnostic features include stator turn to turn fault, broken rotor bar detection, roller bearing faults, foundation looseness, eccentricity, and misalignments. Using advanced Motor Current Signature Analysis (MCSA), the 869 continuously analyzes the motor current signature and based on preset algorithms will determine when an electrical, thermal or mechanical fault / failure condition exists in the motor.


The C60 provides ten synchrocheck elements that monitor voltage difference, phase angle difference and slip frequency taking the CB closing time into account to ensure proper breaker closure as per user requirements. Any of the ten synchrocheck elements can be dynamically blocked or
unblocked by other elements or user logic, allowing coordination with other C60 protection settings and groups. The C60 provides additional enhancements in synchronizing by checking dead source conditions for synchronism bypass under these conditions.


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 provide s 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

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.

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.

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Multilin 869 motor protection relay functional block diagram

Multilin 869 Brochure

Multilin 869 Manual

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