GE 869REF-AI-280 Protective relay platform

GE 869REF-AI-280 Protective relay platform

DESCRIPTION

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 869 is equipped with an integrated synchronous motor protection module for protection and control of 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.

To simplify the migration and upgrade from an existing SR 469 protection relays, retrofit have been developed which significantly simplify the upgrade process. Learn more

Enhanced Motor Protection functions

Single Unit-based Solution for Protection, Control & Monitoring of Sync. and Induction Motors

Auto-resynchronization control

Speed-biased thermal model - Time vs Speed curve based

Field excitation system DC application control

Field excitation start sequence protection Excitation system regulator feedback control

Excitation current monitoring

Excitation voltage monitoring

Motor loading and unloading control

Monitoring of motor stabilizing condition

Rotor temperature monitoring

Reduced voltage starting feature – allows high inertia load

Auto-generated time-speed curve from stall time and run time

Starting Control

Start sequence control

Reluctance torque synchronization

Incomplete start sequence

Stabilizing feature

Auto loading and unloading feature

Key Benefits

• Enhanced generator protection algorithms provide sub-cycle differential protection, ensuring  faster fault clearing times for reduced generator damage 

• Dedicated generator monitoring and control functions providing mission critical operational data  to enable a pro-active maintenance approach 

• Additional overall generator-transformer differential (87O) providing additional back-up protection 

• Advanced generator diagnosis, comprehensive asset monitoring and high-end fault and  disturbance recording, simplifies pre- and post-fault analysis 

• Advanced cyber security features including AAA, Radius, RBAC and Syslog enabling NERC/CIP  requirements 

• Low insertion force, draw-out design simplifying testing, commissioning, and maintenance for  increased process uptime 

• Optional Wi-Fi connectivity minimizes system configuration and facilitates remote relay  programming and diagnostic retrieval 

• Patented environmental monitoring, providing visibility to changes in environmental conditions  that can affect relay life

Overcurrent Elements

The 889 can be used to provide backup protection for transformer and  adjacent power system equipment. Instantaneous overcurrent (IOC)  elements can be used for fast clearing of severe internal and external  (through) faults. Up to six time overcurrent protection (TOC) elements per  winding allow to coordinate with the adjacent protection zones and act as  backup protection. 

• IOC protection functions are provided for phase, neutral & ground  currents  

• TOC protection functions are provided for phase, neutral and ground  currents. A variety of standard time curves including IEEE, IEC, GE IAC,  I2t, definite time are provided 

• FlexCurves to coordinate with adjacent protections (including fuses)  as well as transformer damage curves and thermal/damage curves for  downstream equipment Directional protection functions are provided for  phase, neutral and ground currents. The voltage memory function enables  a more reliable relay operation, especially for faults close to the VTs.