Reactor, Motor And Connections Protection - Siemens 7SR242 Duobias Technical Manual

6.6 Reactor, Motor and Connections Protection

Fig. 6-10 AC Connections for Reactor and Connections Protection
Settings must take into consideration:
Connections: High internal and through fault currents.
Series reactor: Through fault current limited by reactor.
Shunt reactor: Single end fed faults only.
Motor: Single end fed faults only.
Generator: Single end fed faults only.
Primary current values are not subject to variation due to tap changing (as in transformer / OLTC applications),
st
the 87BD and 87BD 1 Bias Slope can both be set to 0.1.
The inrush inhibit feature (81HBL2) must be enabled as the magnetising inrush currents in each phase will not
balance.
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