Phase Rotation; Description; Setting Notes - Siemens 7SC80 Manual

Functions

2.24 Phase Rotation

2.24 Phase Rotation
A phase rotation function via binary input and parameter is implemented in 7SC80 devices.
Applications
•
Phase rotation ensures that all protective and monitoring functions operate correctly even with anti-
clockwise rotation, without the need for two phases to be reversed.

Description

2.24.1
General
Various functions of the 7SC80 only operate correctly if the phase rotation of the voltages and currents is
known. Among these functions are the undervoltage protection (based on positive sequence voltages), the
directional overcurrent protection (direction with cross-polarized voltages), and several measured value super-
vision functions.
If an "acb" phase rotation is normal, the appropriate setting is made during configuration of the Power System
Data.
If the phase rotation can change during operation, a reversal signal at the binary input configured for this
purpose is sufficient to inform the protection device of the phase sequence reversal.
Logic
Phase rotation is permanently established at address 209 PHASE SEQ. (Power System Data). Via the exclu-
sive- OR gate the binary input
[meldelogikdrehfeldumschaltung-090902-kn, 1, en_US]
Figure 2-120
Influence on Protection and Monitoring Functions
The swapping of the phases affects only the calculation of the positive and negative sequence quantities and
the calculation of phase-to-phase quantities by subtracting two phase-to-ground voltages and vice versa so
that the phase-selective indications, fault values and operational measured values are not distorted. This func-
tion thus influences the directional overcurrent protection, voltage protection, flexible protection functions,
and some of the monitoring functions that generate indications if the defined and the calculated phase rota-
tions do not match.

Setting Notes

2.24.2
Setting the Function Parameter
The normal phase sequence is set at 209 (see Section
phase rotation is reversed temporarily, then this is communicated to the protection device using the binary
input >Reverse Rot. (5145).
358
>Reverse Rot. inverts the sense of the phase rotation applied with setting.
Message logic of the phase rotation reversal
2.1.3 Power System Data 1). If, on the system side,
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017