Raptor
68
Test:
Select and inject the adequate test voltage level.
It is advisable to inject the maximum voltage value considered to be safe for the
insulation of the secondary winding of the transformer on one side, and that is not going
to exceed the value in primary of 3 V, which is the maximum value that input V1in can
measure.
To determine the maximum injection voltage, the following arithmetic operation must be
carried out:
V of maximum injection = (Nominal primary of CT in A/Nominal secondary of CT in
A)*3
The maximum voltage that can be obtained from the Auxiliary Output of the equipment is
230 V, which should not present any risks for any secondary winding due to insulation.
It will be possible to read the ratio value V2/V1 during the injection, a well as the phase
angle value (polarity), which should be zero or very close to this value.
If the measurements are seen to be unstable, and their values are continuously changing,
use the FILTER option to see the most stable values.
To stop the injection and finish the test, simply click on the button of the dial.
Volt. Transformer (VT)
This template is designed to determine the transformation
ratio in voltage measurement transformers, their
primary/secondary phase angle and their polarity. The
normal denomination of these transformers is usually VT or
also PT, although the latter could be confused with Power
Transformer.
Regardless of their nominal primary value in KV, these
transformers have three standard nominal secondary
values, 100 V, 110 V or 120 V.
This means that their transformation ratios are, as a general
rule, very high; for example, a primary rate VT of 132 KV and secondary of 110V has a
ratio of 1200, which means that if we inject the maximum voltage of the 230 V auxiliary
output through primary, we will obtain a voltage in secondary of 230/ 1200 = 0.192 V,
which can be measured perfectly through measurement input V1.
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