Divide the primary current rating by the secondary current rating of the current transformer (CT) to find the CT ratio.
A CT Ratio Calculator is a helpful tool used to determine the ratio of primary current to secondary current in a current transformer (CT). This ratio is crucial in electrical systems for accurately stepping down high currents to measurable levels for metering, protection, and control devices.
It is widely used in power systems, industrial installations, and energy monitoring. Understanding the CT ratio ensures proper transformer selection and system efficiency.
Formula:
CT Ratio (CT) = PC / SC
| Variable | Description |
|---|---|
| CT | Current Transformer Ratio |
| PC | Primary Current Rating (in Amperes) |
| SC | Secondary Current Rating (in Amperes) |
Solved Calculations:
Example 1
| Given | Value |
|---|---|
| Primary Current (PC) | 200 A |
| Secondary Current (SC) | 5 A |
| CT Ratio | 200 / 5 = 40:1 |
Example 2
| Given | Value |
|---|---|
| Primary Current (PC) | 300 A |
| Secondary Current (SC) | 5 A |
| CT Ratio | 300 / 5 = 60:1 |
What is the CT Ratio Calculator?
The CT Ratio Calculator is a fine tool. It serves to simplify the process of determining the current transformer (CT) ratio, a critical factor in electrical metering and protection systems.
This tool aids users in accurately assessing the ratio between primary and secondary currents, ensuring the proper selection and functionality of CTs in diverse applications.
Using the calculator is straightforward. Input the primary and secondary current values, and the tool will instantly calculate the CT ratio. This ensures precision while saving time, whether you’re setting up metering equipment, designing protection circuits, or performing energy audits.
The calculator is valuable across industries like power distribution, industrial energy management, and electrical system design. It helps professionals determine optimal CT sizing, ensure compliance with metering accuracy standards, and validate protection device configurations.
Final Words
The CT Ratio Calculator is a dependable and efficient resource for electrical professionals. By streamlining the calculation process, it enhances accuracy and simplifies the selection of CTs, contributing to the reliability and safety of electrical systems.
