Current Transformer Ratio Calculator

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.

In the loaded Current Transformer Ratio case, primary current equals 1,000.00 A. Retain the initial result as the comparison baseline.

Current Transformer Ratio alternate: set Secondary current to 5.5 A while cT ratio keep their Current Transformer Ratio defaults. Compared with the original 5 A case, Primary current changes from 1,000.00 A to 1,100.00 A. Name each Current Transformer Ratio case by operating condition; neither is an automatic margin.

For Transformers and Power Supplies, test Primary current at nominal and limiting secondary current values. Keep the Current Transformer Ratio cases separate.

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.

When Current Transformer Ratio feeds another worksheet, transfer Primary current at full precision. Preserve voltage stress, current stress, loss, ripple, regulation, and thermal capacity. Round secondary current after the Current Transformer Ratio transfer.

For Current Transformer Ratio, source Secondary current from nameplate data, winding measurements, oscilloscope traces, and load tests. Record line voltage, frequency, waveform, load level, and component temperature. CT ratio needs matching conditions.

For Current Transformer Ratio, record secondary current, cT ratio. Record Secondary current state for Current Transformer Ratio. Keep primary current unrounded.

Reading the Current Transformer Ratio result

This output represents Current Transformer Ratio.

The result informs selection but does not approve a component or installation.

Use Primary current to use Current Transformer Ratio to calculate primary current. Compare it with voltage stress, current stress, loss, ripple, regulation, and thermal capacity. Primary current does not override another Transformers and Power Supplies limit.

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.

Convert Secondary current for Current Transformer Ratio. Store original and converted secondary current values for Current Transformer Ratio. Prefix errors alter primary current.

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.

Evaluate leakage inductance, parasitic capacitance, core saturation, switching transients, and cooling separately. In Current Transformer Ratio, represent each effect through Secondary current. Document secondary current allowances.

Records for Current Transformer Ratio

In Current Transformer Ratio, tie secondary current to its source and state. For output magnitude, use Buck-Boost Converter Calculator.

Preserve raw primary current with the chosen secondary current rating.

Questions about Current Transformer Ratio