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Message: <blockquote data-quote="imhotep" data-source="post: 23972539" data-attributes="member: 562115">Briefly an earthing transformer provides a ground path with relatively low impedance, so that the system neutral will be near ground potential. Also limits the transient over voltage spikes and provides the ground fault current during a line-ground fault.These transformers are relatively small, no true kVA rating is normally specified unless you are expecting it to use it to provide auxilliary power. Sometimes what's known as a zig-zag grounding transformers are used - these are smaller in size for the same zero sequence impedance.As I said before it's a bit hard to explain these in detail...<img src="/styles/default/xenforo/smilies/default/sorry.gif"  class="smilie" loading="lazy" alt=":sorry:" title="Sorry    :sorry:" data-shortname=":sorry:" /></blockquote>

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