Megger PVS 100i, User Manual

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41
Meas.
point Description / Operating instructions
MP 1 The same vector groups are used between medium and low voltage and between medium and high
voltage. The phase shifts caused by the vector groups between base station and mobile unit are
cancelled out.
Consequently, a measurement of the type
LV measurement can be performed with measurement
profile .
MP 2 The vector groups used between low and medium voltage have rotary fields with different rotational
directions. This results in the phase shift adding up to -300°. There is no suitable measurement profile.
A measurement of the type LV measurement with measurement profile . The displayed values (60°,
300°, 180°) must be assigned by hand.
Example :
The displayed value of
300°
can be assigned to L3 based on the following calculation:
Display – phase correction = result
300°
-
(-300)° (= 600° - 360°) = 240° ⇒ L3
MP 3 The voltage is tapped with the HV sensor at the high voltage side of the transformer.
The same vector groups are used between medium and low voltage and between medium and high
voltage. The phase shifts caused by the vector groups between base station and mobile unit are
cancelled out.
A measurement of the type
HV measurement
with measurement profile .
MP 4
The voltage is tapped at the capacitive test point of the switchgear. This is the same type of test point as
used at calibration point
.
The vector groups between medium and high voltage are the same and cancel each other out.
A Capacitive test point type measurement with measurement profile .
MP 5 The voltage is tapped with the HV sensor at the medium voltage overhead line. There are no vector
groups between the calibration point
and the measuring point.
Consequently, a measurement of the type HV measurement can be performed with measurement
profile .
MP 6
The voltage is tapped with the HV sensor at the high voltage side of the transformer. There are no vector
groups between the calibration point
and the measuring point.
Consequently, a measurement of the type
HV measurement
can be performed with measurement
profile .
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