33
34
7.8 Phase Sequence Detection
1
As shown in Figure 14, press MENU to select gear of
voltage (V)+voltage (V)+voltage
(V)
. Insert red testing pen into
V1
jack, blue testing pen into
V2
jack, yellow
testing pen into
V3
jack and black testing pen into
COM
jack and connect 4
testing pens to measured power, three-phase load and grounding end.
Figure 14
1
As shown in Figure 15, 16 &17, instrument will display phase sequence detection result for
load loop of three-phase four-wire system.
Figure 15 Any phase of voltage
is less than 30V.
Figure 16 Inverted sequence
Figure 17 Positive sequence
2
Positive sequence layout is shown in following figure. As shown in Figure 18, LCD can
display positive sequence detection result when connecting V1,
V 2 and
V3 jacks t o
Phase A, B & C if three-phase voltage exceeds 50V.
Positive
sequence
Figure 18
UT241/242/243 OPERATING MANUAL
UT241/242/243 OPERATING MANUAL
