High earth loop impeance at Transformer

MS01 over 3 years ago

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?

Parents

0 Sparkingchip over 3 years ago

It appears that according to your test results the 800 kVA transformer cannot be used to supply a 5.4 kW under sink water heater.

engx.theiet.org/.../en-61000-3-11-and-en-61000-3-12
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0 Sparkingchip over 3 years ago

It appears that according to your test results the 800 kVA transformer cannot be used to supply a 5.4 kW under sink water heater.

engx.theiet.org/.../en-61000-3-11-and-en-61000-3-12
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High earth loop impeance at Transformer

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