Elspec G4500 BlackBox - Page 79

79
table - unbalance section (Avg, Min, Max) parameters calculation method:
The table outlines the sections' Parameters including Calculation:
Parameter
Definition
Unbalance
The Supply Voltage Unbalance is Evaluated Using the Method of
Symmetrical Components in Accordance with IEC61000-4-30
Unbalance Avg.
The Average Supply Voltage Unbalance is Evaluated Using the Method of
Symmetrical Components in Accordance with IEC61000-4-30
Unbalance Min.
The Minimum Supply Voltage Unbalance is Evaluated Using the Method of
Symmetrical Components in Accordance with IEC61000-4-30
Unbalance Max.
The Maximum Supply Voltage Unbalance is Evaluated Using the Method of
Symmetrical Components in Accordance with IEC61000-4-30
Zero Sequence
Unbalance
Negative Sequence
Unbalance
Positive Sequence
Defined as the symmetrical vector system derived by application of the
Fortescue’s transformation matrix, and that rotates in the same direction
as the power frequency voltage (or current):
U
1
= (U
a
+ U
b
+ U
c
) where and U
a
, U
b
, U
c
and are line to neutral voltages (fundamental component)
In Accordance With IEC61000-3-13, ed. 1.0 (2008-02) Ref: 3.26.3
Negative Sequence
Defined as the symmetrical vector system derived by application of the
Fortescue’s transformation matrix, and that rotates in the opposite
direction to the power frequency voltage (or current):
U
1
= (U
a
+ U
b
+ U
c
) where and U
a
, U
b
, U
c
and are line to neutral voltages (fundamental component)
In Accordance With IEC61000-3-13, ed. 1.0 (2008-02) Ref: 3.26.4
Zero Sequence
Defined as the in-phase symmetrical vector system derived by application
of the Fortescue’s transformation matrix:
U
0
= (U
a
+ U
b
+ U
c
) where U
a
, U
b
, U
c
and are line to neutral voltages
(fundamental component)
In Accordance With IEC61000-3-13, ed. 1.0 (2008-02) Ref: 3.26.5
DC VOLTAGE & CURRENT SECTION (rms, Min, Max):