Functions
2.3 Differential Protection
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
72
Tripping logic of the differential protection
The tripping logic of the differential protection combines all decisions of the differential stages and forms output
signals which are also influenced by the central tripping logic of the entire device (Figure 2-22).
The pickup signals that identify the concerned stages of the differential protection stages can be delayed via
the time stage T-DELAY I-DIFF>. Independently of this condition, a single-phase pickup can be blocked for
a short time in order to bridge the transient oscillations on occurrence of a single earth fault in a resonant-
earthed system.
The output signals thus processed are combined to the output signals „Diff. Gen. TRIP“, „Diff TRIP
1p L1“, „Diff TRIP 1p L2“, „Diff TRIP 1p L3“, „Diff TRIP L123“ in the tripping logic of the
device. The single-pole information implies that tripping will take place single-pole only. The actual generation
of the commands for the tripping (output) relay is executed within the tripping logic of the entire device (see
Section 2.16.1).
Figure 2-22 Tripping logic of the differential protection
2.3.2 Setting Notes
General
The differential protection can be switched 1201 or STATE OF DIFF. in address ON OFF. If any device is
switched off, a calculation of measured values becomes impossible. The entire differential protection system
of both ends is then blocked.
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