Instrument Transformers Application Guide - ABB
9.6.8 Transformer protection RET670 (RET521) and transformer differential protection RADSB 124 9.6.9 Busbar protection REB670 (RED521) 125 9.6.10 High impedance differential protection RADHA 126 9.6.11 Pilot-wire differential relay RADHL 126 9.7 Current transformer requirements for CTs according to other standards 127
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