Transformer Protection Application Guide
2013-5-28 · 27ll Undervoltage ll = line to line 27ln ln = line to neutral (or line to ground. Note neutral may be isolated from ground in some systems.) 32 Power Element Used to sense power backfeed through transformer 47 Negative Usually defined by: V2 = (Van+a2Vbn+aVcn)/3. (a=1∠120). sequence It is also possible to define V2 in terms of Vll.
Get Price