Thytronic DMC3S - Description of Operation; Measurement Conventions

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DMC3S - Manual - 08 - 2021
4.3 DESCRIPTION OF OPERATION
— Measurement conventions
Phasor direction of rotation
The conventional direction of rotation assumed for the voltage and current phasors is counterclock-
wise.
Cyclic phase sequence
For a set of three voltage or current phasors rotating counterclockwise, one conventionally assumes
a direct cycle if the three phases follow the sequence L1, L2, L3, and an inverse cycle when the
sequence is L1, L3, L2.
Sign conventional for phase
shifts
[1]
Note 1 The phase shift regulation and display ranges are 0°... 359°
fasori.ai
Positive cyclic direction triple Negative cyclic direction triple
UL1,IL1
UL3,IL3UL2,IL2
UL1,IL1
UL2,IL2UL3,IL3
convenzioni-sfasamenti.ai
Phase shift of IL1 relative to phase voltage UL1
(measured in the counterclockwise direction)
Phase shift of IL1 relative to phase-to-phase voltage U23
(measured in the counterclockwise direction)
Phase shifts
(current in advance)
PhiL1=30°
IL1
UL2
UL3
UL1
(current delayed)
PhiL1=330°
IL1
UL2
UL3
UL1
Alpha1=120°
U23
U23
IL1
UL2
UL3
UL1
Alpha1=60°
U23
U23
IL1
UL2
UL3
UL1