Electricity Usage and Measurement
Current Transformer Reading Calculator
Current Transformer Reading converts the entered electrical measurements into primary current. Use it to the primary current calculation.
Enter values for primary current
Use one consistent electrical operating case for all fields.
How Current Transformer Reading works
The example applies primary = secondary × CT ratio. Current Transformer Reading uses Meter secondary reading, CT ratio to report Primary current.
With the loaded values, primary current evaluates to 640.00 A. Use separate cases for competing input values. Compare this result with Electrical Diversity Factor Calculator when diversity factor is also needed.
Inputs for Current Transformer Reading
Meter secondary reading and CT ratio belong to Current Transformer Reading. Keep source units with meter secondary reading.
Use the defaults to understand the output, then enter the real circuit or energy data.
- Meter secondary reading
- Example entry: 3.2 A.
- CT ratio
- Example entry: 200.
Reading the Current Transformer Reading result
This output represents Current Transformer Reading.
Component selection requires more than the arithmetic result; verify margins, transients, and published ratings.
Measurement and units
Keep tariff periods, demand intervals, meter ratios, and measurement bandwidth consistent with the question being answered. Check prefixes on meter secondary reading.
Do not compare cases built from different unit prefixes or measurement locations.
Limits of this calculation
Include any programmed meter ratio.
Unlisted circuit behavior remains outside the computed result. Unentered effects remain outside Current Transformer Reading.
A useful Current Transformer Reading comparison
Record primary current before testing a different meter secondary reading value. For appliance energy, use Appliance Energy Use Calculator.
Document the alternate meter secondary reading source.
Questions about Current Transformer Reading
What does Current Transformer Reading calculate?
It evaluates primary current from meter secondary reading and cT ratio using the displayed formula.
Can Meter secondary reading be zero?
For Current Transformer Reading, measure any zero meter secondary reading directly.