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8
Creating Measurement Profiles
Introduction By connecting the mobile unit to a known phase L1, the phase shift between base
station and mobile unit which arise from vector groups can be compensated by means
of the offset compensation function (see below). The required correction angle is then
saved in a measurement profile.
If later on, a phase identification is undertaken at a measuring point with the exact same
phase shift to the base station, calling up this measurement profile will automatically
load the appropriate correction angle. The phases can then be directly read off without
having to perform any further configurations or calculations.
A mobile unit should always be prepared with a suitable measurement profile for every
phase shift to the base station that may occur in the area of application.
Requirements In networks in which the same vector groups are always used between the voltage
levels and the capacitive test points are of the type HR or LRM (according to
IEC 61243-5), it would suffice to create a measurement profile for each voltage level.
However, should the vector groups between the voltage levels differ in type or direction
of field rotation, additional profiles must be created for the affected branches (see also
the case example in chapter 10).
The same also applies to differing types of capacitive test points within a voltage level.
Different measurement profiles must also be created for these.
A measurement profile only retains its validity as long as the base station remains
connected to the same reference phase! Turning the power plug 180° would also
change the reference phase position!
Prerequisites To create a measurement profile, the following conditions must be met:
•
Expert mode must be activated on the mobile unit (see section 7.1).
•
The mobile unit must be connected to L1 while the measurement profile is
created.
Offset compensation When a new measurement profile is created, an offset comparison ( ) must always
be performed. This involves the mobile unit connected to L1 calculating the actual phase
shift in relation to the base unit and storing this as a correction angle in the
measurement profile.
Whenever the measurement profile is subsequently used to determine the phase within
this voltage level, thanks to this correction angle all system-related (e.g. vector groups,
capacitive taps) and PVS-internal phase shifts will be automatically offset.
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Summary of Contents for PVS 100i
Page 1: ...Issue 4 12 2016 EN Article number 84534 USER GUIDE PVS 100i Phase Verification System...
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