Figure 198: 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 operate
current
should be set to value:
(Equation 42)
IRtot The total resistive earth-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 earth-fault current of
the network).
p security factor = 0.5…0.7
This setting should be set based on the total resistive earth-fault current of the
network including the parallel resistor of the coil and the network losses. It must be
set to a value which is lower than total resistive earth-fault current in order to enable
dependable operation.
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
397
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