Current Transformer Output

Bhargavteja
Bhargavteja
@bhargavteja-oqCkWS • Oct 26, 2024

Hi all,
Basically i was from electronics domain but i was doing a project now where i was using a current transformer to step-down the ac currents in the circuit for measurement. The input to the CT is 1A rms current with a power factor 1. Output of the CT will be shown in the image (The Yellow one was the current waveform). The CT which i used was of CT1052(Turns ratio : 2500:1) of Electrohms make. The burden which i used was 56e. I was getting distorted output waveform(even if i changed burden vaues) can anyone please help me with this.

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Mar 13, 2017

    The recommended secondary burden for this model is 90 ohms resistive. 56 ohms may be over loading.

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  • Bhargavteja
    Bhargavteja

    @bhargavteja-oqCkWS • Mar 14, 2017

    A.V.RamaniThe recommended secondary burden for this model is 90 ohms resistive. 56 ohms may be over loading.

    Hi sir,
    Thanks for your reply. As burden increases, the resistance will saturate the CT(I just read it somewhere). Will the usage of lower burden also impacts the performance of a CT ?

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Mar 14, 2017

    The distortion in the waveforms with changes in the secondary burden of the CT are described in this paper:

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  • Bhargavteja
    Bhargavteja

    @bhargavteja-oqCkWS • Mar 15, 2017

    Thanks for the reply....
    I used a burden of 200 ohms and i got the following waveforms from the CT output when i had a primary current of 1A rms(power factor = 1). The waveform looks to be fine but appears to be having distortions. Is the waveforms from CT will look like that ?

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Mar 15, 2017

    I doubt that there will be any distortion in output wave form. Both input and output wave forms should match. Is it possible that there is some high frequency noise either in the circuit or nearby, which is picked up by the scope leads?

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