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Scheme communication logic for residual
overcurrent protection (EFC)
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In the blocking scheme, set the tCoord timer to the channel transmission time during
disturbance conditions. Add a margin of 20-30 ms. Two times the nominal value of the
channel transmission time is recommended when a power line carrier is used.
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In the permissive communication scheme, the security against unwanted operation
caused by spurious carrier receive signals can be increased by delaying the tripping out-
put with the tCoord timer. Set the timer in the range of 0.000 to 60.000 s. In most cases,
a time delay of 30 ms is sufficient.
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