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
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