PQFA Instructions Manual
Asea Brown Boveri Jumet S.A.
56
9.3.4. Checking the correct connection of the CTs with two current probes.
If the main bus bar is available and all security rules are taken, it is possible to
use the two channel scope meter in order to see if the current measured
through the CT is matching the real current in the bus. Connecting the current
probes as shown on Figure 9.7., the two traces must be in phase and of the
same shape (the magnitude could be different as the gain are different) if the
wiring is correct.
L1
L2
L3
Load side
Supply side
K
L
k
l
K
L
k
l
K
L
k
l
PQF
X5.2
X5.3
X5.4
X5.5
X5.6
X5.1
L1
L2
L3
Ch1
Ch2
Positive direction
Positive direction
Figure 9.7. Connection of the scopemeter for checking CT in phase L1
by comparing the currents.
This operation has to be repeated for the remaining two phases for a
complete check. The current probes have to be changed accordingly.
9.3.5. Checking the correct connection of the CTs with a Fluke 41B.
The Fluke 41B is a power analyser that allows measurements of one voltage
and one current wave. Unfortunately, the device does not allow simultaneous
display of both waveforms on the screen. But it is possible to synchronise the
triggering on either the voltage or on the current. All phaseshift measurements
are then referenced to the chosen origin. To read directly the phaseshift
between the fundamental components, just select the spectrum window of the
signal which is not chosen as the origin.
The instrument must be configured in single phase measurements.
The probes must be connected as shown on Figure 9.2, Figure 9.5 and Figure
9.6.
Summary of Contents for PQFA
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Page 19: ...PQFA Instructions Manual Asea Brown Boveri Jumet S A 19 Master cubicle view Zoom on next page ...
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Page 21: ...PQFA Instructions Manual Asea Brown Boveri Jumet S A 21 Control rack details ...
Page 22: ...PQFA Instructions Manual Asea Brown Boveri Jumet S A 22 Master cubicle door view ...
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Page 25: ...PQFA Instructions Manual Asea Brown Boveri Jumet S A 25 Slave cubicle door view ...
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