GE Multilin™ G60 Comprehensive Protection for Generators

Multilin™ G60

Comprehensive Protection for Generators

The Multilin G60 generator protection system provides comprehensive protection for medium and

large generators, including large steam and combustion turbines, combined-cycle generators and

multicircuit hydro units.

The G60 includes advanced automation and communication capabilities, extensive I/O options,

and powerful fault recording features that can simplify postmortem disturbance analysis and help

minimize generator downtime.

Key Benefits

• Secure, high-speed protection elements for complete generator protection, compliant with IEEE®

C37.102. extending asset life

• Available Ethernet Global Data (EGD) to ease integration with new and existing GE control systems

• Embedded Synchrophasor measurement capabilities (per IEEE® C37.118), eliminating the need for

dedicated PMUs and support for synchrophasor multi-cast (per IEC® 61850-90-5) reducing bandwidth

and communications infrastructure costs

• Advanced IEC 61850 Ed. 2 implementation, complete settings via SCL files and IEC 61850-9-2 process

bus solution enable resource and platform managing optimization and reduce cost of ownership

• Increased network availability via failover time reduced to zero through IEC® 62439-3 “PRP” support

• CyberSentry™ provides high-end cyber security aligned to industry standards and services (NERC®

CIP, AAA, Radius, RBAC, Syslog)

• Advanced fault and disturbance recording, including internal relay operating signals, eliminating the

need for external recording devices

Applications

• Medium to large generators typically driven by steam, gas, or hydraulic turbines

• Pumped storage generators used as pumping motors for reservoir storage

• Stand-alone protection or component in automated substation control systems

• Standard protection product offering on new GE generator installations

Protection and Control

As part of the UR family of Protection &Control devices, the G60 offers a high

degree of modularity in its design and functionality, providing superior performance

while meeting the toughest requirements of the marketplace.

Advanced protection and control features of this relay includes:

Generator Stator Differential

High-speed stator differential protection provides sub-cycle detection and high-speed

clearing of stator phase faults. Advanced CT saturation and failure detection algorithms

maintain immunity to high current AC and low current DC saturation conditions that may

occur due to external disturbances, such as transformer inrush or near generator faults,

without sacrificing speed or sensitivity.

100% Stator Ground 3rd Harmonic

100% stator ground fault protection is provided through a voltage differential feature that

responds to the unbalance of the third harmonic at the machine terminals and at the neutral

point. This method is insensitive to the absolute value of the third harmonic and is easily set

without the need for on-line measurements.

For generators with delta connected PTs, a third harmonic undervoltage element is also offered

for detecting a loss of the third harmonic voltage at the generator neutral.

Breaker Failure Protection

The breaker failure protection element monitors for timely operation of the connected breaker.

If a trip command is not successful in operating the breaker and clearing the fault, the breaker

failure element can be used to send trip signals to upstream breakers to clear the fault.