[dwphasor-140212-01.tif, 1, en_US]
Figure 6-160
Phasor Diagram for Direction Determination with Negative-Sequence System Values
If the device determines a fault in the voltage-transformer secondary circuit (through the binary input
voltage transformer circuit-breaker dropout
or through measuring-voltage failure detec-
tion), direction determination will be disabled and every directionally set stage will be blocked. Non-direction-
ally set stages become active again if there are faults in the voltage-transformer secondary circuit.
[lorichtu-070611-01.tif, 1, en_US]
Figure 6-161 Logic of Direction Determination
Directional Mode
You use the Directional mode parameter to define whether the stage works in a forward or reverse direc-
tion. Non-directional operation is also possible.
Protection and Automation Functions
6.18 Directional Negative-Sequence Protection
646 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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