Basler Electric BE3-GPR Generator Protective Relay

INTRODUCTION

Basler Electric’s BE3-GPR Generator Protective Relay provides total

generator protection in a single package. Its microprocessor-based

design provides high accuracy, reliability, and repeatability. The BE3

GPR provides protection for paralleled generating systems or stand

-alone, isolated generating systems.

BE3-GPR setup and configuration can be performed using the provided

Windows®-based setup software or the front panel interface.

Because of the BE3-GPR’s low sensing input burdens, no dedicated PTs

or CTs are required. all current sensing inputs are isolated.

A set of Form C (SPDT) output contacts are provided for each protection

function and the internal diagnostics function.

The enclosure for the BE3-GPR is dust- and moisture-resistant.

Metal case construction enhances the BE3-GPR’s resistance to

electromagnetic interference.

FEATURES

BE3-GPR features include protection functions, contact inputs, internal

diagnostics, front panel indicators, and communication capabilities.

Protection Functions

BE3-GPR protection functions include:

• Overcurrent (51): style selectable as either three-phase or neutral

ground fault

• Phase balance (47)

• Loss of excitation (40)

• Sync-check (25)

• Overfrequency (81O)

• Underfrequency (two 81U elements)

• Reverse power (32R)

• Dead bus

Contact Inputs

Four continuously monitored contact inputs accept switch inputs or

jumpers and perform the following functions.

Trip Reset. Clears all tripped functions when auto reset is disabled.

Program Enable. Enables setting changes to be made at the front panel.

Failsafe Enable. Changes output contact operation to failsafe mode

(output relays are energized during

normal, non-tripped conditions).

Output Enable. Disables the output contacts. This feature prevents

nuisance tripping during generator buildup.

Internal Diagnostics

Internal diagnostics are provided by a watchdog timer. The watchdog

timer monitors for proper firmware execution and microprocessor

operation. If an internal operating error occurs, the Watchdog Timer

(WDT Fail) output contacts change state to annunciate the problem.

Front Panel Indicators

Front panel indicators consist of a liquid crystal display (LCD) and a

Sync LED indicator. The front panel LCD serves as the main user

interface and displays all information necessary for programming

and interpreting BE3-GPR actions.

The Sync LED lights to indicate that the generator is synchronized with

the bus. The Sync LED also lights when a dead bus condition exists.

Communication

An RS-232 serial port enables communication between the BE3-GPR

and a PC operating the BE3-GPR communication software.

BE3-GPR communication enables relay configuration and real-time metering

of power system parameters.