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Functions
2.2 Phase Comparison Protection and Ground Differential Protection
[ansprechkennl-diffschutz-20110526, 1, en_US]
Figure 2-11
If it is desired that an internal fault should initiate a TRIP command and additionally a local current of a specific
quantity should exist, the value of this current can be set at address 1225 87N L: I>RELEAS. The default
setting for this parameter is zero so that this additional criterion does not become effective.
The differential current and the restraint current 3I0diff and 3I0restr are included in the fault record.
Blocking / Interblocking
The ground current differential protection can be blocked via a binary input. The blocking at one end of a
protected object affects all ends via the communications link (interblocking). If the overcurrent protection is
configured as an emergency function, all devices will automatically switch to this emergency operation mode.
Pickup Logic
The following figure illustrates the pickup logic of the ground current differential protection for grounded
systems.
56
Pickup characteristic of the ground differential protection
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
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