Transformers and Power Supplies
Current Transformer Ratio Calculator
Use Current Transformer Ratio to the primary current calculation. The loaded example shows the arithmetic with practical electrical units.
Enter values for primary current
Use one consistent electrical operating case for all fields.
How Current Transformer Ratio works
The stated formula is Ip = Is × ratio. Current Transformer Ratio uses Secondary current, CT ratio to report Primary current. Use Rectifier DC Output Calculator.
With the loaded values, primary current evaluates to 1,000.00 A. Retain the initial result as the comparison baseline.
Inputs for Current Transformer Ratio
Secondary current and CT ratio belong to Current Transformer Ratio. Keep source units with secondary current.
Replace every example value with data from one documented operating condition.
- Secondary current
- Example entry: 5 A.
- CT ratio
- Example entry: 200.
Reading the Current Transformer Ratio result
This output represents Current Transformer Ratio.
The result informs selection but does not approve a component or installation.
Measurement and units
Check component ratings, isolation requirements, temperature, waveform, and manufacturer limits. Check prefixes on secondary current.
Preserve the measurement basis when testing alternatives.
Limits of this calculation
Never open-circuit a loaded current-transformer secondary. Compare this result with Transformer Copper Loss Calculator when copper loss is also needed.
The displayed formula isolates the stated electrical quantity. Unentered effects remain outside Current Transformer Ratio.
Current Transformer Ratio record notes
Record source and operating details for secondary current. For output magnitude, use Buck-Boost Converter Calculator.
Retain raw primary current beside its selected rating.
Questions about Current Transformer Ratio
What does Current Transformer Ratio calculate?
It evaluates primary current from secondary current and cT ratio using the displayed formula.