17
Please refer to Input power precautions in safety section for detailed description of input power
requirements.
2.5 Operating System
Unit works on Windows operating system.
3.0 Basic Theory of Operation
3.1 General
The purpose of this section is to explain the basic theory of the following tests and to guide the operator
for making appropriate measurements with the MVCT. The following tests can be performed by the
MVCT.
3.2 CT Testing
3.2.1 Ratio Test
The ratio is defined as the number of turns in the secondary as compared to the number of turns in the
primary.
The purpose of ratio test is to prove the ratio of the CT, is as specified and also to verify the ratio at
different taps of a multi tap CT. The turns ratio is equivalent to the voltage ratio and can be expressed
as:
N2/N1=V2/V1
Where,
N2 and N1 are no. of turns of secondary and primary windings respectively
V2 and V1 are the secondary and primary side voltage readings respectively.
A suitable voltage, below saturation is applied to the secondary of the CT under test and primary side
voltage is measured to calculate the turns ratio from above expression.
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