GE 15LSWGR901, Operation & Maintenance Manual

Page: 23 / 188

BE1-27, 59, 27/59
3
SPECIFICATIONS
Power Supply
One of five power supply types may be selected to
provide internal operating power. They are described in
Table 1.
Table 1 - Power Supply Options
PICKUP SETTINGS
Front panel potentiometers, continuously adjustable over
the range defined by the style number, establish the
voltage pickup levels. One potentiometer is provided for
each timed and instantaneous function. Actual pickup is
within 2% of 0.5 volt of the setting, whichever is greater.
Dropout is within 2% of actual pickup, occurring in 50
milliseconds or less.
PICKUP COMPARATORS
The monitored system voltage is compared individually to
each pickup setting. When the system voltage is greater
than the timed overvoltage setting, the appropriate pickup
Type K J L Y Z
Nominal 48 Vdc 125 Vdc 24 Vdc 48 Vdc
Voltage 120 Vac 125 Vdc
Burden 4.4 W 4.4 W 4.5 W 4.4 W
10.1 VA 4.4 VA
250 Vdc
240 Vac
5.5 W
14.0 VA
Figure 1 - Functional Block Diagram
FUNCTIONAL DESCRIPTION
The specifications on these pages define the many
features and options that can be combined to exactly
satisfy an application requirement. The block diagram,
Figure 1, illustrates how the various standard features, as
well as options, function together.
INPUTS
Voltage Sensing
A system voltage transformer with standard 120/240 Volt
secondary supplies the Under/Overvoltage Relay’s input
transformer with a single-phase voltage from the moni-
tored circuit. This voltage is scaled, filtered, and rectified
to represent the voltage magnitude of the monitored
circuit.
Nominal sensing input ratings, defined by the style
number, are 120 or 240 Vac with a maximum burden of 1
VA single phase at 40 to 70 Hz. The maximum continuous
voltage rating is 360 Vac for 120 Vac nominal, and 480 Vac
for 240 Vac nominal.
System Voltages
The BE1-27, BE1-59, and BE1-27/59 relays are available
with three sensing input ranges. The 55 to 160V range is
intended for use with nominal system voltages of 120V or
69V (120/
√
3). The 110 to 320 volt range is intended for use
with nominal system voltages of 240V, 208V (120 x
√
3), or
277V (480/
√
3). The 1 to 40V range is intended for use with
a wye/broken delta VT configuration with 120V or 69V
(120/
√
3) line-to-ground secondary voltages.
PICKUP SETTINGS
INST. TIMED
OVER OVER UNDER UNDER
TIMED
OV
COMPARATOR
OV TIME
DIAL
OV
TIMER
OV
AUX.
AUX.
AUX.
AUX.
TARGET
TARGET
TARGET
TARGET
TIMED
UV
COMPARATOR
INST.
UV
COMPARATOR
INST.
OV
COMPARATOR
UV
TIMER
UV
POWER
POWER
SUPPLY
POWER
SUPPLY
SENSOR
POWER
SUPPLY
STATUS
TO INTERNAL
CIRCUITRY
UV TIME
DIAL
LOW-PASS
FILTER
FULL-WAVE
RECTIFIER
MONITORED
VOLTAGE
OPERATING
POWER