Basler Electric BE1-64F - Manual (Page 15)

SECTION 3
• FUNCTIONAL DESCRIPTION
INTRODUCTION
The BE1-64F Ground Fault Relay detects and annunciates ground faults in the normally ungrounded field
circuit of a synchronous machine.
The BE1-64F applies a dc voltage between the field circuit and ground. When a ground fault occurs, the
BE1-64F detects the flow of current and annunciates the fault. Detection of ground faults by the BE1-64F
depends upon the nominal field voltage and the location of the ground fault in the field winding.
BE1-64F FUNCTION BLOCKS
BE1-64F functions are illustrated in Figure 3-1. The following paragraphs describe each of the function
blocks illustrated in Figure 3-1.
Figure 3-1. BE1-64F Function Block Diagram
Power Input
Operating power applied to terminals A12 (line) and A11 (neutral) is stepped down and applied to the
power supplies in the relay. The power input accepts voltage in the range of 90 to 132 Vac.
Power Supplies
Stepped-down ac voltage from the power input is rectified, filtered, and regulated. The power supplies
apply regulated dc voltage to internal relay circuitry and supply the dc voltage impressed across the
protected circuit and ground.
POWER INPUT
BLOCK INPUT
LOSS OF AC
POWER
ALARM
OUTPUT
CONTACT
POWER
SUPPLIES
FIELD (F-) AND
ROTOR
GROUND
INTERFACE
CURRENT
DETECTOR AND
REFERENCE
TRIP
COMPARATOR
ALARM
COMPARATOR
GND TRIP
OUTPUT
CONTACT
PRE-ALARM
OUTPUT
CONTACT
TRIP/ TEST
(Not supplied on
P/N 9367200104)
TARGET
RESET
TO INTERNAL
CIRCUITS
A1:
F-
A3:
GND
(CORE)
A10:
LINE
A11:
NEUTRAL
A12:
LINE
A13:
CHASSIS
GND
A6
PRE-
ALARM
A4
A5
A8
A9
GND
TRIP
PWR
FAIL
A7
P0024-16
9367200990 Rev B BE1-64F Functional Description 3-1