PM 1001484 000 06
Device handbook SINEAX DM5000
32/87
b)
Phasor verification
: The phasor diagram shows a technical visualization of the current and voltage
phasors, using a counter-clockwise rotation, independent of the real sense of rotation.
The diagram is always built basing on the voltage of
the reference channel (direction 3 o’clock)
Correct installation (expectation)
•
Voltage sequence in clock-wise order
L1
L2
L3
(0°
-120°
120°)
•
Current sequence in clock-wise order
L1
L2
L3
•
Similar angle between voltage and current phasors in all
phases (approx. -20°)
What’s wrong?
•
Voltage sequence:
L1
L2
L3
•
Current sequence:
L1
L3
L2
;
Current L2 is out of
the expected sequence
•
Angle U-I: Angle between U
L2
and I
L2
is approx. 180°
wrong
Required correction
Exchanging the connections of current I
2
What’s wrong?
•
Voltage sequence:
L1
L3
L2
; L3 and L2 seem to be
interchanged
•
Current sequence:
L1
L2
L3
•
Angle U-I: Angle between U
L2
and I
L2
is approx. 180°
wrong
Required correction
Exchanging the connections of the voltages L2 and L3
What’s wrong?
•
Voltage sequence:
L1
L3
L2
; L3 and L2 seems to
be exchanged
•
Current sequence:
L1
L3
L2
;
Current L2 is out of
the expected sequence
•
Angle U-I: Angles between U
L2
/ I
L2
and U
L3
/ I
L3
do not
correspond to the expectations
Required correction
Exchanging the connections of the voltages L2 and L3 and
reversing the polarity of the current input I
2
What’s wrong?
•
Voltage sequence:
L1
L2
L3
•
Current sequence:
L2
L3
L1
•
Angle U-I: The U-I angles do not correspond to the
expectation, but are similar
Required correction
Cyclical exchange of the voltage connections: L1
L3,
L2
L1, L3
L2. As an alternative the sequence of all
current may be changed as well (more effort required).