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current transformer underground substation maintenance

Substation: Underground - UEE2015-2-20 · Secondary over-current protection is provided by 3-phase current transformers connected to an overload relay that trips the primary load break switch in the event of an overload. Substation ground fault currents are limited by a continuously-rated neutral ground resistor (NGR) connected to the transformer secondary star point.uee.com/sites/default/files/Underground Substation.pdf

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