Siemens SIPROTEC 7SD80 User Manual

Functions
2.2 Phase Comparison Protection and Ground Differential Protection
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
61
Blocking / Interblocking
The ground current differential protection can be blocked via a binary input. The blocking at one end of a pro-
tected object affects all ends via the communications link (interblocking). If the overcurrent protection is config-
ured 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 sys-
tems.
Figure 2-12 Ground current differential protection pickup, grounded system
You will find the logic diagram for the general pickup of the differential protection and the differential protection
tripping in Section 2.2.5.

Siemens SIPROTEC 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SD80
Category	Protection Device
Language	English