Functions
6-150 7SA522 Manual
C53000-G1176-C119-2
6.10.2 Applying the Function Parameter Settings
A prerequisite for the operation of the switch-on-to-fault protection is that in address
627)2YHUFXUU = (QDEOHG was set during the configuration of the device
scope of functions (Section 5.1). It is furthermore possible to switch the function, in ad-
dress , 627)2YHUFXUU 21 or 2)).
The magnitude of the current which causes pick-up of the switch on to fault function is
set as ,!!! in address . The setting value should be selected large enough to
ensure that the protection under no circumstances picks up due to an overload condi-
tion or due to a current increase resulting from e.g. an automatic reclosure dead time
on a parallel feeder. It is recommended to set at least 2.5 times the rated current of
the feeder.
6.10.3 Settings
The indicated secondary current values for setting ranges and default settings refer to
I
N
= 1 A. For the nominal current 5 A these values are to be multiplied by 5.
6.10.4 Information Overview
Addr. Setting Title Setting Options Default Setting Comments
2401 FCT SOTF-O/C ON
OFF
ON Inst. High Speed SOTF-O/C is
2404 I>>> 1.00..25.00 A 2.50 A I>>> Pickup
F.No. Alarm Comments
4253 >BLOCK SOTF-O/C >BLOCK Instantaneous SOTF Overcurrent
4271 SOTF-O/C OFF SOTF-O/C is switched OFF
4272 SOTF-O/C BLOCK SOTF-O/C is BLOCKED
4273 SOTF-O/C ACTIVE SOTF-O/C is ACTIVE
4281 SOTF-O/C PICKUP SOTF-O/C PICKED UP
4282 SOF O/CpickupL1 SOTF-O/C Pickup L1
4283 SOF O/CpickupL2 SOTF-O/C Pickup L2
4284 SOF O/CpickupL3 SOTF-O/C Pickup L3
4295 SOF O/CtripL123 SOTF-O/C TRIP command L123
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