Current Transformer Output

Bhargavteja · 2017-03-13T18:47:23+00:00

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.

Current Transformer Output

Bhargavteja
@bhargavteja-oqCkWS

Updated: Mar 13, 2017

Views: 1.2K

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.

0

Replies

Howdy guest!

Dear guest, you must be logged-in to participate on CrazyEngineers. We would love to have you as a member of our community. Consider creating an account or login.

Replies

Ramani Aswath

Member • Mar 13, 2017

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

Are you sure? This action cannot be undone.
Cancel
Bhargavteja

Member • Mar 14, 2017

A.V.Ramani
The 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 ?

Are you sure? This action cannot be undone.
Cancel
Ramani Aswath

Member • Mar 14, 2017

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

Are you sure? This action cannot be undone.
Cancel
Bhargavteja

Member • 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 ?

Are you sure? This action cannot be undone.
Cancel
Ramani Aswath

Member • 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?

Are you sure? This action cannot be undone.
Cancel