24
25
2. Three-Phase Four-Wire Measuring:
Connect yellow UA, green UB, red UC and black N correspondingly to
terminals yellow U1, green U2, red U3 and black COM on the meter, then
get current clamps I1, I2, I3 grasp measured IA, IB, IC.
3. Three-Phase Three-Wire Measuring:
Connect measured voltage lines to yellow UA, red UC and Green UB
correspondingly to terminals of the mete yellow U1, red U3 and black COM,
then get current clamps I1, I3 grasp measured IA and IC. Reference
connection figure shown as below.
It is possible to differentiate among inductive and capacitive load, phase
sequence and the polarity during measuring. If U1I1 phase angle is displayed
ranging from 0
90
, it measured load will be diagnosed as inductive; it is
capacitive load with scope from 270
360
; it is positive phase sequence
and has the same polarity with phase angles all close to120
; otherwise
positive phase sequence and reverse polarity is obtained with phase angle
close to120
and 300
( it may caused by wrong current clamping or wiring
connection), other conditions will be identified as reverse phase sequence
(absence of phase not considered).
Under phase sequence measuring mode, U1, U2, U3 or I1, I2, I3 are
considered as positive phase sequence with cursor flashing from left to right
side; and if the other way, U1, U2, U3 or I1, I2, I3 cursor move from right to
left side. If corresponding cursor does not flash, it is likely that phase may be
absent or signal amplitude is too low.
