11
quired, be sent to other devices using analog
can also be received from other devices over the
station bus, thus increasing the extent of relevant
information.
The standard configuration D includes one conven-
tional residual current (Io) input and three com-
bi-sensor inputs for phase currents and phase volt-
ages. The connection of the three combi-sensors is
made with RJ-45 type of connectors.
Sensors offer certain benefits compared to conven-
tional current and voltage instrument transform-
ers, for example, current sensors do not saturate at
high currents, they consume less energy and they
weigh less. In voltage sensors the risk of ferro-reso-
nance is eliminated. The sensor inputs also enable
the use of the relay in compact medium voltage
space for conventional measuring transformers,
thus requiring the use of sensor technology. Fur-
ther, the adapters also enable the use of sensors
with Twin-BNC connectors.
3
52
3
52
Δ
Y
52
Υ or Δ
3
REF615 Conf D
51P/50P
50BF
51G/50G
AFD
3
REM615 Conf E
51P/50P
50BF
49M
51LR/66
27/27PS
59
32U
87M (Restrained Diff)
RTD
AFD
REM615 Conf E
51P/50P
50BF
49M
51LR/66
27/27PS
59
32U
87M (Self-bal. Diff)
RTD
AFD
MM
3
52
REM615 Conf B
51P/50P
50BF
49M
51LR/66
27/27PS
59
RTD
AFD
M
3
3
3
52
REM615 Conf A
51P/50P
50BF
49M
51LR/66
37M
RTD
AFD
M
250HP 500HP 1500H
000HP
—
Figure 5. Motor
protection and control of
circuit breaker controlled
motors using standard
configurations A,B, and E
controlled motors using standard configurations
instability due to busbar voltage collapse, the
simultaneous starting of several motors can be
supervision.
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