Functional Description
3-1
SECTION 3
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FUNCTIONAL DESCRIPTION
GENERAL
BE3-GPR Generator Protective Relays are microprocessor based devices that provide multifunction
protection for genset systems. There are two basic BE3-GPR models: BE3-GPR S for standalone
systems and BE3-GPR P for paralleled systems. Each model comprises a basic set of capabilities. This
section describes the hardware and software functional descriptions for a BE3-GPR P with all available
protective features.
FUNCTIONAL DESCRIPTION
Figure 3-1 illustrates the BE3-GPR P circuit functions described in the following paragraphs.
Switching Power Supply
The internal switching power supply uses the +12 Vdc or +24 Vdc input to generate the ±6 Vdc, +5 Vdc, a
stable +5 Vdc reference for the analog to digital converter, and a pulse width modulated signal to drive the
output relays. In addition, it provides a separate and isolated 5 Vdc module to give power to the opto-
isolated RS-232 channel.
Figure 3-1. BE3-GPR Block Diagram
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