Overview

The BE1-64F relays are designed to detect unintentional grounding in field

windings of a synchronous generator or motor. Two fixed levels of ground

detection are provided: a prealarm level and a trip level. Each level has an

independent LED indicator and output contact.

The BE1-64F Ground Fault Relay detects and annunciates ground faults in

the normally ungrounded field circuit of a synchronous machine.

A short-circuit in a synchronous machine’s field can often be prevented

by detecting and removing a ground fault before a second ground fault

results in serious damage.

BE1-64F relays are compatible with continuous field voltages up to 600 Vdc

and forcing voltages up to 750 Vdc for one minute. During reverse excitation

(negative forcing), BE1-64F relays will withstand up to 1.200 Vdc for one

minute.

Two sets of relay outputs and front panel indicators are provided for fault

annunciation and tripping duty. One set of output contacts, one front panel

indicator, and a latching target indicator annunciate the detection of a ground

fault in the field winding. A second set of output contacts and a front panel

indicator annunciate the detection of lower than normal resistance across the

field winding and ground.

Replacement of an ABB 64F with the BE1-64F is simplified because the panel

cutout and drilling pattern for the BE1-64F matches that of the ABB 64F.