Basler BE1-27 Manual - page 14
BE1-32R, BE1-320/U
SPECIFICATIONS,
continued
Three-Phase (Figure 1 0). The type D
sensing configuration monitors three line-to-neutral volt
ages and three phase currents of a three-phase, four-wire
circuit and calculates the power flowing in the tripping
direction. Relays with this sensing type are calibrated in
three-phase watts.
Figure
10
-
Three Phase, Type D Sensing
E
Three-Phase (Figure 11 ). The type E
sensing configuration monitors three line-to-line voltages
and two of the phase currents of a three-phase, three-wire
circuit and calculates the power flowing in the tripping
direction. The power equation assumes that conditions
are balanced. Relays with this sensing type are calibrated
in three-phase watts. Note: Type E configurations are
phase rotation sensitive.
CALIBRATION: THREE PHASE WATTS
IF
UNBALANCED:
WHERE:
IF
BALANCED:
'ce
\ :
P= nEL-L
1A cose
Figure
1 1
-
Three Phase, Type
E
Sensing
Power Supply
One of five power supply boxes may be selected to
provide internal operating power. They are described in
Table 1.
6
Nominal
Input
Burden
Type
Input
Voltage
at
Voltage
Range
Nominal
0
48Vdc
24to 60 Vdc
6.5W
p
125 Vdc
62 to 150 Vdc
6.0W
120 Vac
90 to 132 Vac
15.5 VA
tR
24Vdc
12 to 32 Vdc
7.5W
T
250 Vdc
140 to 280 Vdc
9.5W
230 Vac
190 to 270 Vac
27.0VA
t
TypeR Power Supply may require
14 Vdc to begin operation. Once operating, the
voltage may be reduced to
12 Vdc.
Table
1
-
Power Supply Options
POWER RANGE PICKUP
Overpower pickup of the relay is adjustable by means of a
front panel 1 0 position rotary TAP select switch used in
conjunction with the front panel HIGH/LOW switch over the
defined ranges listed in Table 2. Underpower pickup is
continuously adjustable from 1 0 to 95% of the selected
overpower tap. Pickup accuracy is within 2% (or 0.05
watts) of the front panel setting for unity power factor.
Pickup accuracy is within 5% of the front panel setting for
all other power factors between 0.9 and 0.5. The range of
voltage for proper operation is 40 to 150 percent of the
nominal value.
When the calculated value for power exceeds the over
power pickup setting or falls below the underpower pickup
setting and is in the tripping direction, the appropriate LED
is illuminated and timing is initiated. One indicating LED is
provided for each measuring function within the relay.
KW TRANSDUCER
The kW Transducer samples the current and voltage of
each phase on a continuous basis. The resulting signals
representing current and voltage are multiplied and in
tegrated to develop a de voltage level that is representative
of true kW.
COMPARATOR CIRCUITS
The de output of the kW Transducer is then compared to
front panel settings for underpower and/or overpower.
When the reference level of the comparator (or compara
tors if applicable) is crossed, the output of the comparator
is used to either energize the appropriate output (if instanta
neous timing has been specified) or to initiate the timing
circuits (definite, or inverse).
TIMING
Time delay is defined as the elapsed time between the
application of the condition to the input terminals of the
relay and the transition of the output contacts.
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