B) Input connection:
- N. 2 measurement cables (to the 600 V measurement), or N. 1
cable for low voltage measurement connection, shielded, 4 m long
(for the 10 V measurement; shown in the circuit diagram), plus N.
2 Clamps to connect the voltage measurement.
Take care of current direction, else the p.f. test will give wrong
result: the red socket (output or input) is the positive.
Also for the measurement of the voltage you have to take care of
the polarity. For the measurement of the voltage, you can use
either the 10 V metering input or the 600 V input. The choice is
performed considering the test current IP and the VA rating.
Given:
. VA = VA rating,
compute:
VS = VA / IN
If VS < 10 V, connect to the 10 V input, that has a better
resolution; else, connect to the 600 V input.
Now, input in the screen:
. The CT nominal secondary current IN;
. The test current output: 10 A or 40 A;
. The secondary voltage measurement input: 10 V or 600 V.
Press test start button (56), and adjust the secondary current to
the desired value by the adjustment knob (6): the screen shows:
. The secondary current;
. The secondary voltage;
. The phase angle, in degrees, between current and voltage, with
the voltage taken as the reference. Usually this angle will be
negative, because the burden is inductive;
. The corresponding power factor;
. The VA burden at the nominal current IN. This measurement
will not change very much with the test current.
When you are satisfied with the result, press SAVE: test result is
saved. Return to zero the adjustment knob (6).
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