A SERVICE OF

logo

Open as PDF
next previous
Power Quality Analyzer Model 3945-B
29
4.1.5 Electrical Hookup (electrical network)
• Highlight ELECTRICAL HOOKUP with the buttons, then press the
button.
Thefollowingscreenwillappear:
N
L1
Single-Phase
N
L1
L2
Two-Phase
N
L1
L2
L3
3 Phase 3-Wire
N
L1
L2
L3
3 Phase 4-Wire
07/25/02 10:2 6 100
%
Figure 4-3
• Choose the hookup type with the
and
buttons.
• Press the
button to apply the new hookup selection.
Hookup Types:
Single or two-phase: The neutral current is not measured or calculated.
3 phase-3 wire connection (3V, 3A):
OnDELTAnetwork:Only power totals are measured.
Powers per phase are displayed, but not valid.
OnWYEnetwork:
The neutral current is not calculated. It is necessary
toconnectneutral(V)toobtainthepowerperphase.
3 phase-4 wire connection (4V, 3A): The neutral current is available and
its value and waveform are displayed.
OnWYEnetwork: Powersperphaseareavailable.
NOTE: Neutral current is calculated, not measured, in the 4 wire hookup.
V1 must be connected in all hookups, since the display is synchronized from V1
and the network frequency measured by V1.
Neutral current is calculated by adding, for each datapoint, each of the 3
measured phases of current. This assumes that all current ows through
neutral. This results in a 256 datapoint waveform. If the 3 phases of current
were balanced, the calculated neutral current would be 0 for every datapoint.