ABB 615 series Technical Manual page 453

1MAC059074-MB A
615 series ANSI
Technical Manual
determination on compensated networks and it is also valid when
compensation coil is switched off and network becomes ungrounded.
GUID-0A818501-E0BD-402F-BF8B-22BA6B91BBA2 V1 EN
Figure 214: Illustration of amplitude and resistive current sectors if Operating quantity
is set "Adaptive" and Directional mode is set "Forward"
The setting rules for current thresholds are given below.
In case the "Adaptive" operating quantity is selected, the setting Min trip current should
be set to value:
[ ] pu p IRtot
< ⋅
GUID-77CF1715-3730-414C-BC8E-075792F791FB V1 EN
IRtot The total resistive ground-fault current of the network corresponding to the resistive current of the
parallel resistor of the coil and the natural losses of the system (typically in order of 1...5 % of the total
capacitive ground-fault current of the network).
Section 4
Protection functions
(Equation 65)
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