Field Ground Protection Module

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The Multilin GPM-F field ground protection module works in combination with the Multilin G60 Generator Protection System to detect ground faults in the field winding of the generator. Providing application flexibility, the field ground protection module can be configured for either single point injection or double point injection based on application requirements. The solution includes two stage field ground detection, injected voltage and current supervision, brush lift-off detection, field over and under current elements and field ground fault location.

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Key Benefits

• Providing advanced field ground fault protection for generator applications

• Allowing both single point and double point injection methods provides optimal application flexibility depending on system configuration

• Reduce generator down-time by locating the fault within the field winding when connected in single point injection method

• Designed to operate with GE’s Multilin industry leading G60 Generator Protection System

• Continuously monitors and protects the generator during stopped, starting and running conditions for increased asset life

• Reduce system configuration time by configuring the Field Ground Protection Module through the G60 Generator Protection System and the easy-to-use EnerVista Setup Software

• Increase generator lifespan by easily upgrading your current G60 generator protection relay with the Field Ground Protection Module

• Simplified setup and configuration using EnerVista setup software

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Applications

• Medium to large generator applications

• Deployable with redundant generator protection systems

• Suitable for use with generator field voltages up to 800VDC

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Protection & Control

​The G60 Generator Protection System provides comprehensive protection for medium and large generators, including large steam and combustion turbines, combined-cycle generators and multi-circuit 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. As part of the UR Family, the G60 provides superior protection and control that includes:

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Field Ground Protection

​Field ground protection identifies occurrence of ground fault in a generator field winding and helps to prevent serious damage to the generator, maximizing operational lifespan. The field ground protection module, GPM-F
works in combination with the Multilin G60 to detect ground faults in the field winding of the generator. Providing application flexibility, the field ground protection module can be configured for either single point injection or double point injection based on application requirements. The solution includes: two stage field ground detection, injected voltage and current supervision, brush lift-off detection, field over and under current elements and field ground fault location. If the rated field voltage of the generator is
less than or equal to 600 Vdc, then a single box solution is provided. However if the rated field voltage of the generator is between 600-800Vdc, then an external resistor box is provided to facilitate safer installation and operational practices.

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Single Point Injection

Providing application flexibility and diagnostic information, single point injection provides the ability to quickly identify the fault location in the field winding, thus reducing damaging the generator and reducing down-time. Single point injection can’t be used on generators with brushless excitation unless both poles of the field winding is directly connected to a brush.​

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Double Point Injection

​In addition to single point injection, the GPM-F module allows for ground fault detection via double point injection. Double point injection has typically been used on applications where generators are equipped with static excitation. When the GPM-F is connected for double point injection the fault location feature is not available. It is recommended that is fault location is required that the GPM-F be configured for single point injection.

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