ABB RED615 Technical Manual page 353

1YHT530004D05 D
615 series
Technical Manual
• Small steady state line charging current
• In-zone transformer no load current
• Impact of tap changer positions
The timer is activated according to the calculated differential, stabilizing current
and the set differential characteristic.
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Figure 179: Operation logic of the stabilized low stage
The stabilization affects the operation of the function.
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Figure 180: Operating characteristics of the protection. (LS) stands for the low
stage and (HS) for the high stage.
Section 4
Protection functions
347