THE reference for power system transients

Step Response of WB Cable

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  • 31 July 2025 at 13h53 #6864
    anonymous
    Keymaster

    Good day

    I am attempting to simulate the response of a wideband cable that is faulted at the receiving end. However, whenever I inject a step pulse into the cable, I do not see any current reflections at the fault switch. I have double-checked the continuity, fault switching times, and signal properties.

    The injected pulse is a 50V step wave with a 10ms on time. The fault is an SLG at 0s until infinity. The fault occurs on the C phase while a and b on the cable are grounded so are the sheaths.

    The circuit and cable parameters are shown below I have already applied DC Correction in the fitter.

    The circuit and traces are shown below

    31 July 2025 at 13h54 #6866
    anonymous
    Keymaster

    Please see the spreadsheet below for the cable data. I attempted to format it in HTML as well as pasting as an image but to no avail

    https://myuwi-my.sharepoint.com/:x:/g/personal/shankar_ramharack_my_uwi_edu/EYjK1A_KarVMskeyAtLHufoBXcrM5kqPth3rk9SMVrUISQ?e=xccCLO

    31 July 2025 at 13h54 #6867
    anonymous
    Keymaster

    Hi Shankar,

    Maybe you should zoom on your current waveform. If you cable is 1km, the travelling wave reflection delay would be between 1-10us I believe.

    31 July 2025 at 13h55 #6868
    anonymous
    Keymaster

    Hi gras,

    So are you saying that the ends of the waveform where ringing is seen are actually the fault reflections? I was told that this was just switching transients. When I zoom in I see an envelope that goes to the steady-state flat line. as seen above.

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