M
MPQ1000-UG-EN Rev 6 April 2020
10
Rapid Voltage Changes: Under-Deviation Assessment and Over-
Deviation Assessment:
Voltage Unbalance:
The negative sequence component
u
2 is evaluated by the following ratio, expressed as a
percentage :
For 3-phase systems, this can be written (with
U
ij fund = phase i to phase j fundamental
voltage):
The zero-sequence
u
0 component is evaluated by the magnitude of the following ratio,
expressed as a percentage:
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