Neutral Grounding Resistor, Neutral Grounding Reactor, Grounding Transformer?

Having trouble finding good resource material on these three. Any help would be appreciated!
What are the main differences and their main uses?

Also- on a grounding transformer(the ones we are testing), the Impedance is measured in ohms and not as a percentage. Could someone explain a little more about that?

Ty all again!!!

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You might find these helpful:

Characteristics of different power systems neutral grounding techniques: Fact and fiction
https://www.eaton.com/content/dam/eaton/products/medium-voltage-power-distribution-control-systems/vacclad-w-pages/characteristics-power%20systems-neutral-grounding-techniques-fact-fiction-ap083005en.pdf

Neutral Grounding Resistors – Technical Information

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The link was perfect! Ty!!

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