Enter the CT ratio and the secondary current (amps) into the calculator to determine the Primary Current From CT Ratio.
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Primary Current From CT Ratio Formula
The following formula is used to calculate the Primary Current From CT Ratio.
Ip = CT * Is
- Where Ip is the Primary Current From CT Ratio (amps)
- CT is the CT ratio
- Is is the secondary current (amps)
How to Calculate Primary Current From CT Ratio?
The following two example problems outline how to calculate the Primary Current From CT Ratio.
Example Problem #1:
- First, determine the CT ratio. In this example, the CT ratio is measured to be 40.
- Next, determine the secondary current (amps). For this problem, the secondary current (amps) is calculated to be 5.
- Finally, calculate the Primary Current From CT Ratio using the formula above:
Ip = CT * Is
Inserting the values from above and solving the equation with the imputed values gives:
Ip = 40 * 5 = 200 (amps)
Example Problem #2:
Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:
CT ratio = 60
secondary current (amps) = 3
Entering these values into the formula or calculator above gives us::
Ip = 60* 3 = 180 (amps)
