DETAILED OPERATION - Section 4
MTS-1700 SERIES OPERATION AND REFERENCE MANUAL 4-37
CU A002 15A
MANTA TEST SYSTEMS
FIGURE 4.25 VOLTAGE ADJUSTMENT WITH UNBALANCED SYSTEMS
4.8
PHASE ANGLE CONTROL
4.8.1
Basic Adjustments
Interpreting the phase angle display:
Pressing the [PHASE] button ([PHASE V-I] button on older instruments) displays the phase angle between
the voltage being monitored and the current, except in a few special cases.
The voltage being monitored is determined by the FAULT MODE controls, and may be a
Φ
-N or a
Φ
-
Φ
voltage. This is displayed in the lower left corner of the [MODE/MENU DISPLAY].
If V-leads-I phase angle measurement reference is selected (the factory default setting), indicated by
“DEG:V-I” in the upper left corner of the [MODE/MENU DISPLAY], then the phase angle is the number
of degrees by which the voltage leads the current. If I-leads-V phase angle measurement reference is
selected (i.e. the default), indicated by “DEG:I-V” in the upper left corner of the [MODE/MENU
DISPLAY], then the phase angle is the number of degrees by which the current leads the voltage.
Adjusting the phase angle:
When the [MODIFY] knob is turned, the phase angle between the current, and all three voltage phases, is
changed. The interphase angle between the voltages remains fixed.
Changing the display mode:
Pressing the [PHASE] button toggles between the 0-360 and 0-±180 display modes.
4.8.2
Interpretation of Phase Angle Display and Fault Mode Selection
This section assumes that V-leads-I phase angle measurement reference is selected. If I-leads-V phase angle
measurement is selected, then the display values will be 360, minus the value shown.
C'
B
A'
A
C
Three-Phase
B
C
A
A'
B'
C'
Phase-to-Phase
