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Current Transformer Design and Accuracy Test (Ratio and Phase Error)

Approx. component budget: Rs. 4,000 - 8,000

Objective

Wind and test current transformers and find their ratio error and phase error at different currents and burdens.

What you will build

Toroidal CT cores with different turns and burden resistors, a primary current source (variac and heater load), reference meter and an oscilloscope or phase-detection circuit.

Results you can expect

• Ratio error vs primary current and burden
• Phase error
• Saturation point
• Comparison of two core materials

What you will learn

How CTs work, accuracy classes and burden, which are fundamental in metering and protection.

Tools and notes

Toroidal cores, enamelled wire, oscilloscope, reference meter, Excel. Never open-circuit a CT secondary while the primary carries current, and use an isolated, fused test set-up.

Resume points from this project

• Built and tested Current Transformer Design and Accuracy Test (Ratio and Phase Error); objective: wind and test current transformers and find their ratio error and phase error at different currents and burdens.
• Measured and analysed ratio error vs primary current and burden and phase error; wrote the report and presented the results in a viva. Add your own numbers: [x].

Replace [x] with your own measured results. Write only what you really did.

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