Plug-In Compatibility - Add the SEL-2664 Field Ground Module to the SEL-300G Generator Relay, SEL-700G Generator Protection Relay, and SEL-700GT Intertie Protection Relay to protect all critical components in your generator. Or, add the SEL-2664 to the SEL-2664S Stator Ground Protection Relay for complete rotor and stator ground fault protection.

Continuous Monitoring - Measure field-to-ground resistance before the generator starts rotating. Protect your generator from excessive starting stress by detecting field ground faults prior to startup. Continuously monitor resistance during operation.

Optical Communication - Avoid exposure to potentially hazardous dc field voltages by using digital fiber-optic communications. Eliminate tedious calibrations and variations that are common when sending analog signals to the relay.

Rugged Design - Built to the same high standards as SEL protective relays, the SEL-2664 withstands vibration, electrical surges, fast transients, and extreme temperatures, meeting stringent industry standards. The printed circuit boards are conformally coated to provide an additional barrier to airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture.