transformers in the feeder circuit (for example, in the transformer bushings). It is often
required to separate the protection zones that the feeder is protected with one scheme
while the T-zone is protected with a separate dif
ferential protection scheme. The 1Ph
high impedance differential HZPDIF (87) function in the IED allows this to be done
efficiently, see Figure
62.
Section 7 1MRK 502 071-UUS A
Differential protection
168 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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