Megger MPQSIM, Руководство пользователя

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M
AVTMMPQSIM Rev 1 May 2017
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3. RMS and Demand Values
a. View the voltages and demand values on the DVM screen of the MPQ Analyzer.
NOTE: The phase angles of the voltage and current. Voltages and current are at
0, 120 and 240. This is true under purely resistive loads only.
Confirm the following:

The KW is positive. This indicates the power is flowing from the source to
the load.
 The KVAR is near zero. This indicates there is minimal phase shifting due to
reactive loads.

The DPF is 1.0 and is positive. This is a sign of a resistive load.
The Displacement Power Factor (DPF) is the power factor of the fundamental value.
(COS of the phase angle between the voltage and current)
b. View the waveforms on the Scope screen of the MPQ Analyzer. Scroll through
the phases.
The currents are in phase with the voltages .
4. Phase Rotation
a. View the Vectors and Power Factor on the DVM Power screen of the MPQ
Analyzer.
The phase rotation is as follows:

Phase A Voltage = 0
°

Phase B Voltage = 120
°

Phase C Voltage = 240°
This is an ABC Phase rotation.
b. Swap Phase B and C voltage inputs.
The phase rotation is as follows:

Phase A Voltage = 0°

Phase B Voltage = 240°

Phase C Voltage = 120°
This is an ACB phase rotation
Notice the currents are still in an ABC Phase rotation. The Phase B and C current
phase angles now have a phase angle difference of greater than 90° from their
voltages.