Raptor
82
be obtained, but with little resolution as the function calculates up to 40 increases with
respect to the value entered (they could be too big). It would also be possible for it to be
above the knee point with the first increase and then the test would not offer any result. If
the value entered is smaller than the real value of the CT, it would not offer any result,
either. It is advisable to enter a slightly higher value than expected in this parameter, if
this is known. The level curve in V generated is not linear with time. Increases in V
decrease as it approaches Vmax. This improves the resolution in the area of interest.
The test consists of injecting a ramp of ascending voltage values up to 20% above the
maximum voltage entered or a maximum of 40 pitches (logarithmic voltage increases).
After the maximum test value has been reached, the CT is demagnetised, generating the
same voltage points, in descending order and with a smaller time interval.
During the test, the injected voltage will increase every 2 seconds up to a maximum of
20% above the maximum value entered.
The test ends with a demagnetisation process, if the current measured or voltage
measured exceeds the maximums entered, or the maximum voltage that the equipment
can generate is reached.
The test can also be aborted by pressing (off). In this case, the CT is NOT demagnetised.
When the test ends, by tapping on the
Graph
button, it is possible to see the graph of the
test points that make up the magnetisation curve and the position of the knee point, if it
has been detected. The representation of the reference axes of the curve is logarithmic for
the X-axis (I magnetisation), and linear for the Y-axis (V magnetisation).
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