CT Ratio Calculator – Calculate Current Transformer Ratio with Precision

A CT Ratio Calculator is a free online tool that calculates the Current Transformer (CT) Ratio, which is the ratio of primary current to secondary current in a current transformer. By inputting the Primary Current (PC) and Secondary Current (SC) in amperes (A), this calculator provides the CT ratio instantly. It’s an essential tool for electrical engineers, technicians, and professionals working on power systems, electrical metering, or transformer installations.

Our free online CT Ratio Calculator simplifies the calculation process, delivering accurate results for electrical engineering and power distribution projects.

Why Use a CT Ratio Calculator?

• Accurate Results: Compute the CT ratio with high precision for reliable transformer performance.
• Time-Saving: Get instant results without manual calculations or complex formulas.
• Versatile Applications: Ideal for power system design, metering, and electrical maintenance.
• User-Friendly: Simple interface, accessible to both professionals and beginners.

This calculator ensures you select the correct current transformer for your electrical system.

CT Ratio Formula

The CT Ratio is calculated using the following formula:

CT = PC / SC

Where:

CT = Current Transformer Ratio

PC = Primary Current (in amperes, A)

SC = Secondary Current (in amperes, A)

For example, if the primary current is 1000 A and the secondary current is 5 A:

CT = 1000 / 5 = 200:1

Note: The CT ratio is typically expressed as a ratio (e.g., 200:1), indicating that the primary current is 200 times the secondary current.

How to Use Our CT Ratio Calculator

1. Enter Primary Current (PC): Input the primary current in amperes (A).
2. Enter Secondary Current (SC): Provide the secondary current in amperes (A).
3. Calculate: Click to get the CT ratio instantly, expressed as a ratio (e.g., 200:1).

Our intuitive calculator makes determining the CT ratio quick and straightforward.

Example Calculation

Problem: Calculate the CT ratio for a transformer with a primary current of 1200 A and a secondary current of 5 A.

Step-by-Step:

Formula: CT = PC / SC

Input Values:

Primary Current (PC) = 1200 A

Secondary Current (SC) = 5 A

Calculate:

CT = 1200 / 5

CT = 240

Result: The CT ratio is 240:1.

Try this example in our calculator to verify the result instantly!

Applications of the CT Ratio Calculator

• Power Systems: Select appropriate current transformers for electrical metering and protection.
• Electrical Engineering: Design and calibrate transformers for accurate current measurement.
• Energy Monitoring: Ensure precise readings for energy consumption or billing systems.
• Maintenance: Verify CT ratios during transformer testing or troubleshooting.
• Education: Teach students about current transformers and their role in electrical systems.

Our calculator supports a wide range of electrical engineering and educational applications.

Benefits of Using Our CT Ratio Calculator

• High Precision: Delivers accurate CT ratio calculations based on the standard formula.
• Free and Accessible: No downloads or subscriptions required—use it online anytime.
• Quick Results: Get the CT ratio in seconds, streamlining your workflow.
• Global Compatibility: Works with standard electrical units (amperes) for international use.

Optimize your transformer selection with our reliable and efficient calculator.

Try Our Free CT Ratio Calculator Today!

Ready to calculate your current transformer ratio? Our online CT Ratio Calculator is fast, accurate, and completely free. Input your Primary Current (PC) and Secondary Current (SC) in amperes, and get the CT ratio instantly for power systems, metering, or engineering projects.

👉 Use the CT Ratio Calculator Now to simplify your electrical calculations!

Frequently Asked Questions!