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GUID-D401D103-BD7C-4096-986F-578925ADB1CC V1 EN
Figure 289:
Positive direction of current
Instantaneous high stage
The differential protection includes an unbiased instantaneous high stage. The
instantaneous stage trips and the
OPR_HS
output is activated when the amplitude of the
fundamental frequency component of the differential current exceeds the set
High trip
value
or when the instantaneous peak values of the differential current exceed 2.5 ·
High
trip value
. The factor 2.5 (= 1.8 · √2) is due to the maximum asymmetric short circuit
current.
The
TRIP
output is always activated when the
OPR_HS
output activates.
The internal blocking signals of the function block do not prevent the operation of the
instantaneous stage. When required, the trip signal due to instantaneous operation can be
blocked by the binary inputs
BLK_OPR_HS
or
BLOCK
.
Section 4
1MAC059074-MB A
Protection functions
574
615 series ANSI
Technical Manual
Содержание Relion 615 series
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