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# Knee Point Voltage Calculator: An Essential Tool for Transformers

The Knee Point Voltage Calculator is a highly useful tool that aids in calculating the knee point voltage of Current Transformers (CTs). This voltage is a critical parameter in the design and operation of transformers.

## What is Knee Point Voltage?

In a Current Transformer, knee point voltage is defined as the magnitude of the secondary voltage above which the magnetizing current increases exponentially. Essentially, it's the voltage at which a CT gets magnetically saturated.

## Understanding the Knee Point Voltage Formula

The Knee Point Voltage is calculated using the following formula:

V<sub>k</sub> = √(2 * CT Ratio * Burden)

Where:

• V<sub>k</sub> is the Knee Point Voltage.
• CT Ratio is the Current Transformer Ratio (I<sub>1</sub>).
• Burden is the impedance (in ohms) connected across the secondary (I<sub>2</sub>).

## How to Use the Knee Point Voltage Calculator

Using our calculator is simple and straightforward. Here's a quick step-by-step guide:

1. Input the CT Ratio (I<sub>1</sub>) into the respective field.
2. Next, enter the Burden (I<sub>2</sub>) in the appropriate field.
3. Click on the 'Calculate' button.

The calculator will instantly compute the Knee Point Voltage and display the result.

## Example

Let's consider a practical example:

Assume we have a Current Transformer with a CT Ratio of 100 and a burden of 5 ohms.