Basler BE1-27 Manual - page 13
BE1-32R, BE1-320/U
SPECIFICATIONS,
continued
If sensing input range 2, 3, 5, 6, 8 or 9 is selected, the
input transformers are capable of 1 0 A continuous
current, 15 A for 1 minute and 200 A for 1 second.
Maximum burden for each current input (2 terminals) is 1
VA at threshold over the frequency range of 45 to 65 Hz.
Voltage Sensing
System potential transformers (PTs) with 120 or 240V
secondaries supply the Directional Power Relay's input
transformers with single or three-phase voltages. The
voltage sensing inputs are nominally rated at 1 00 or
220V (50 Hz) and 120 or 240V (60 Hz) with a maximum
burden of 1 VA per input (2 terminals) over the frequency
range of 45 to 65 Hz. Maximum continuous voltage is
limited to 150% nominal.
SENSING INPUT TYPES
There are 6 sensing input types as defined by the Style
Chart (page 12). The Directional Power Relay's input
circuitry receives voltage and current signals from system
PTs and CTs. The CT signal is adjusted in level by a front
panel range switch before it is applied to the kW trans
ducer circuitry. Several input circuit configurations are
available, the selection of which is determined by the
specific application. The following paragraphs provide a
brief description of each input sensing type and their
calibration
A
Single-Phase (Figure 7). The type A
sensing configuration monitors line-to-neutral voltage
and a single phase current of a three-phase, four-wire
circuit and calculates the power flowing in the tripping
direction. Relays with this sensing type are calibrated in
single-phase watts.
TRIPPING DIRECTION
P= E
(B·N)
18 cose
BE1-32
TYPE "A" SENSING
CALIBRATION: SINGLE PHASE WATTS
Figure
7
-
Single Phase, Type A Sensing
B
or
V
Single-Phase
(Figure 8) with 30° phase shift. This sensing configuration
monitors a line-to-line voltage and a single phase current of
a three-phase, three-wire circuit and calculates the power
flowing in the tripping direction. Since the input voltage
leads the input current by 30° (assuming unity power factor)
a 30° lagging phase shift network is designed into the
voltage input circuit. Relays with this sensing type are
calibrated in single-phase watts. Note: Type B or V con
figurations are phase rotation sensitive.
TRIPPING DIRECTION
P=E
18COSB(0·30'>)
.[3
BE1-32
TYPE
'
B
"
OR 'V" SENSING
CALIBRATION: SINGLE PHASE WATTS
Figure
8
-
Single Phase, Type B or V Sensing
C
Three-phase Scott Tee (Figure 9). The
type C sensing configuration monitors three line-to-line
voltages and a single phase current of a three-phase, three
wire circuit and calculates the power flowing in the tripping
direction. The relay measures actual power even if the
system voltages are not balanced. Relays with this sensing
type are calibrated in three-phase watts.
P=ffEA
v
E
IB cos
(0- 30°)
WHERE E,,, IS THE
AVERAGE OF THE THREE
LINE-TO-LINE VOLTAGES.
TRIPPING DIRECTION
9
8
BE1-32
TYPE
"C"
SENSING
CALIBRATION: THREE PHASE WATTS
Figure
9
-
Three Phase, Type C Sensing
5
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