Description
2.3 Protection system
3WA1 air circuit breaker
66 Equipment Manual, 02/2023, 92310000002-06
2.3.5.10 Reverse power protection RP
The reverse power protection trips the circuit breaker when the power flow through the
device reverses against the defined direction and exceeds the set value for the adjusted
and definite-time delay. The setting is referred to the rated active power P
n
as a
percentage. This is dependent on the rated current I
n
of the circuit breaker and the rated
voltage U
n
parameterized on the electronic trip unit.
For this protection function RP and the power measurements, the energy flow direction
defined in menu item 5.2.2 is used as parameter.
From the user's point of view, the positive energy flow direction could be defined as the
energy flow from the busbar in the direction of the cable outlet.
For reverse power protection, the current and voltage signals are evaluated and the
active and apparent power are put into relation. A reversing power flow is identified by
the phase offset between current and voltage signal.
This function also requires internal voltage taps or external voltage transformers and the
voltage metering module VTM.
Characteristic
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