ABB REG670 Applications Manual page 161

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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Rct
IEC05000427 V2 EN
Figure 60: The high impedance principle for one phase with two current
transformer inputs
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R
Rres
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Protected Object
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a) Through load situation
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b) Through fault situation
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c) Internal faults
Section 7
Differential protection
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IEC05000427-2-en.vsd
155