Instruction Manual TR-Mark III 250V Version 1.10 Preliminary Page 51 of 57
2: Select CT Testing, use 10 (normal), 3: Touch Go A
40V (high ratio) or 1V (low impedance)
A.A.C Low Impedance
In certain cases, where the impedance (inductance) of the CT is so low that TR-Mark III
250V gets to its power limits, an “Overcurrent” Message will be displayed on the screen.
It is then recommended to run the test with a lower test voltage.
A.A.C Info
Of course the ratio in the info field for CTs is defined by Amps / Amps. (Not Volts / Volts as it
is used for voltage transformers. The rest of the ‘Info’ screen remains the same.
A.A.D CTs with Taps (Tapped Secondary)
Current transformers with multiple secondary taps are tested similar to single secondary
taps. After each specific ratio is tested the H1 (or H0) lead can be moved to the next position
and that ratio can then be tested.
In addition to the previous test the secondary of the CT can be tested like an auto
transformer.
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