Overall Generator & Transformer Differential Protection

The 889 provides overall generator and transformer differential

protection (87O). It covers the protection zones from the generator

neutral to the Generator Step-Up (GSU) Transformer’s High

Voltage (HV) winding. For mid to large-size machines, the typical

protection philosophy and architecture is to implement a dedicated

transformer protection device along with a single function

differential relay to provide the overall differential protection

between the transformer and the generator. With support for 3

sets of phase CT inputs, the 889 can replace the single function

device, providing the necessary overall differential protection

with the added benefit of protection redundancy for both the

Transformer and the Generator, when there is no tapping between

the generator and GSU or unit transformer.

Generator Stator Differential

The 889 provides fault clearing operation at up to sub-cycle speed,

by utilizing a high-speed dual slope differential protection for

detecting and clearing of stator phase faults. Advanced CT saturation

detection algorithms maintain immunity to saturation conditions that

may be caused due to external disturbances. Through the use of

a directional check, additional supervision is provided to ensure

the fault is internal to the generator before triggering it to trip. This

sub-cycle operation translates to less burning, and hence low carbon

dissipation and thermal stress on insulation. This also enables root

cause analysis during diagnosis/maintenance of the winding (sever

longer duration faults burns-out all the evidence and make root

cause analysis extremely difficult or sometimes impossible).

Applications

• Comprehensive protection from small to large generators

• Industrial or utility power generation

• Co-generation and renewable generation applications

• Unit Transformer Protection applications

Protection & Control

The Multilin 8 Series provides comprehensive and field proven

algorithms to ensure asset management and uninterrupted

process and system availability. With a fast protection pass, the

8 Series relays provide fast operating current, voltage, power, and

frequency protection elements. With highly configurable protection

logic, system coordination with upstream and downstream

disconnect devices is greatly simplified. Various forms of I/O

are supported in the 8 Series to ensure protection, control, and

management of critical substation and field assets.

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

MULTILIN 889

Advanced Generator Protection and Management

The Multilin™ 889 Generator Protection System, a member of the Multilin 8 Series

protection relay platform, has been designed for the protection, control, and

management of generators and associated unit transformers in critical utility and

industrial applications.

The 889 goes beyond asset protection providing power system engineers with the

data, measurement accuracy, and visibility needed for comprehensive generator

management. These advanced asset monitoring capabilities provides engineers with the

ability to make informed, proactive decisions that enable planned maintenance activities

reducing costs associated with pre- and post-fault analysis, equipment damage, and

unplanned or extended downtime.

With a focus on connectivity and security, the 889 supports the latest in communications

technologies and protocols including IEC 61850 Edition 2. OPC-UA, and IEC 62439/PRP,

and provides advanced, industry standard, cybersecurity tools, ensuring simplified and

secure device integration into new or existing SCADA or DCS systems.

New Build Installations

The 859 is equally as powerful in new installations as it is for retrofits. The shallow depth

behind the panel facilitates ease of mounting, plus the graphical HMI, control and

annunciation capabilities serve to reduce the need for peripheral equipment mounted in

the panel.

The protection and control features carry the strong Multilin design heritage, reducing training

requirements for personnel.

Advanced Motor Monitoring & Diagnostics

Integrated, cost effective monitoring and diagnostic features that leverage existing relay data

without the need for additional devices or sensors to detect electrical, thermal or mechanical

abnormalities before they become critical motor failures.

Applications

• Suitable for Medium to Large HP Induction Motors (typically; 500kW-1MW,

650-1300 HP) found in oil & gas, mining & metals, cement, and wastewater applications

• Medium to large two-speed, VFD-driven and cyclic loading motors

• For high inertia loads and reduced-voltage starting motors

• Retrofit solution as a direct replacement (same mechanical form factor) for

Multilin 169. 269. 269Plus and 369 series relays

Retrofit Solutions

The Multilin 859 has been designed as a direct replacement and upgrade, matching the

height, width depth, to older Multilin 169. 269. 269Plus and 369 protection and control

devices.

The 859 fits the same mechanical cutout and uses the same terminal blocks as existing

369 relays, eliminating the need to rewire the device. For other relays, one-to-one wire

maps are provided to reduce installation and commission times.

The 859 eliminates the need to modify existing cut-outs or wiring, and does not require

re-engineering or drawing changes. The unified 8 Series setup and configuration tool

further simplifies the upgrade process with automated setting file conversion, minimizing

system downtime and commissioning time.

Key Benefits

• Utilizing GE Vernova’s proven Thermal Model for reliable protection of AC induction

motors

• With a depth of 3.5”, the 859 is ideal for MCCs with shallow depths or space constraints

• Detachable display can be mounted up to 15 feet away from the device, allowing for

greater installation flexibility

• Large graphical color LCD display for enhanced operability, with user-configurable

single line diagrams for local control, system status and metering

• Integrated condition monitoring based on Electrical Signature Analysis to deliver

detailed motor health monitoring and Predictive analytics to increase motor life

• CyberSentry™ Advanced Security including features such as AAA, Radius, RBAC, and

Syslog, helping to enable NERC® CIP compliance

• Safe and reliable motor re-start on ‘down hole’ pump applications. Unique back spin

detection feature detects flow reversal on a pump motor, enabling timely and safe

motor restarting

• Single setup & configuration software, reducing training & commissioning time

• Customer Support available 24/7. available in multiple languages

MULTILIN 859 Comprehensive, Compact Motor Protection & Management for Medium

and Large Motors

The Multilin 859 relay is a member of the Multilin 8 Series protective relay platform,

designed for the protection, control and management of medium and large power rating

induction motors. It has been designed for space constrained applications, where

a shallow depth is required, or as a direct replacement for existing Multilin 169. 269.

269Plus and 369 motor protection relays.

Utilizing the same field proven hardware and protection and control algorithms of the

Multilin 8 Series, the 859 delivers advanced features including high-speed protection,

customizable programmable logic, and advanced motor monitoring and diagnostics – all

in a fixed mount, slim design.

With extensive communication capabilities the 859 easily integrates into new or existing

process control systems, enabling operationally focused motor management and control.

SM Start Sequence Control

The 869 Start Sequence Control function provides:

• Controlled application of a DC field to the rotor winding for both brush

type and brushless synchronous motors.

The start sequence function is comprised of three field application

control methodologies:

– Slip-frequency based for brush-type motor applications.

– Timer-based for both brushless and brush-type motor applications.

– Reluctance-torque based synchronization for brush-type motor applications.

• Incomplete start sequence protection to trip/alarm if the starting

sequence is not completed within a set time.

• Load application relay functionality enabling motor loading following

the DC field application and unloading following a trip and/or loss of

synchronization (pole slipping).

• Start sequence control when the motor enters re-synchronization mode.