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High earth loop impeance at Transformer

MS01

Hi There, 

We have just installed a new 800kVA transformer on site with a impedance of 4.75%. However when it comes to taking the EL reading at source we are getting 0.12-0.14ohms compared to what we expect of 0.01-0.02 ohms. 

Other than checking the cable connections, changing the meter or having faulting TX can anyone give me some ideas why this may be. Has anyone come across this before?

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    You are indeed correct in your expectation of a loop impedance of  around 0.02 ohms. I have calculated the figure for you and it comes out at 0.024 ohms. As has been said, best to not rely on everyday loop testers for this level of work.

    Regards, UKPN.

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  • 0

    You are indeed correct in your expectation of a loop impedance of  around 0.02 ohms. I have calculated the figure for you and it comes out at 0.024 ohms. As has been said, best to not rely on everyday loop testers for this level of work.

    Regards, UKPN.

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