CP TD1 Reference Manual V 1.44
156
Figure 12-14 Automatically generated test report
Even comprehensive measurements can be performed very efficiently within a
short time. For example, if all resistances of the taps 1 - 19 upwards and the taps
19 - 1 downwards for all three phases are measured, this corresponds to a total
of 114 resistance measurements. In this particular example, the testing time was
found to be less than 90 minutes for all measurements.
12.9.6 Safety Aspects
Feeding currents of several amps through a coil rated at hundreds of Henries
causes a high magnetic energy to be stored in the coil inductance. If the
measuring circuit was interrupted without discharging this energy, very high
voltages would be induced which would be very dangerous for the operator and
the test system. An automatic discharge of the coil inductance after
measurement is automatically carried out as it is essential for safe operation,
though while switching from one tap to another, a discharge cycle is not
necessary and this saves a lot of time.
R
x
R
m
T
x
235+
T
m
235+
----------------------
×=
x = reference temperature
m = temperature at measurement
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