2 Functions
202
7UM61 Manual
C53000-G1176-C127-3
Influence on Pro-
tective Functions
Swapping phases with a phase sequence inversion affects exclusively calculation of
positive and negative sequence quantities, as well as phase-to-phase voltages by
subtraction of one phase-to-ground voltage from another, so that phase related indi-
cations, fault values, and operating measurement values are not distorted. Thus this
function influences almost all protection functions and some of the monitoring func-
tions (see Section 2.28) which issue an indication if the required and calculated phase
rotations do not match.
2.33.2 Setting Notes
Programming Set-
tings
The normal phase sequence is set at 271 (see Subsection 2.3). If, on the system side,
phase rotation is temporarily changed, then this is communicated to the protective
device using the binary input “>Reverse Rot.”, FNo. 5145).
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