To measure time for sudden change in waveform

Hi friends,

I am doing the fault location using wavelets. For that, am having two waveforms (aerial mode voltage(Va) & ground voltage (Vo)).

If, am creating fault,@0.5s, I need to find out the disturbance time of both waveforms, bcos both waveforms will take some time to respond.

          Thanks!!!

[Muruganandham Subramanian]

For e.g. If i take sine wave input (it may have some small disturbance), after creating the fault @0.5s,that waveform will be more distorted than normal,that particular time i need to measure precisecly.

Answer 1

[Wayne King]

For this, you will want to use either the continuous wavelet transform (cwt or cwtft), or a nondecimated wavelet transform (ndwt, or swt).

[Muruganandham Subramanian]

First of all,

Thanks for ur reply wayne. Any of the wavelets method is ok for me.

[Wayne King]

Then feel free to use any of those methods, see the documentation for examples. You should be able to localize the disturbances at small (fine) scales.

[Muruganandham Subramanian]

@wayne: Can u give some links for this.