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VI
Siemens AG ⋅ May 1998
6.5.4.2 Test steps 6-53......................................................................
6.5.5 Functional testing of circuit-breaker failure protection 6 - 54................................
6.5.5.1 Pick-up characteristic in mode of operation "forced bus zone unbalance" 6 - 54...............
6.5.5.1.1 Test set-up 6-54.....................................................................
6.5.5.1.2 Test steps 6-54......................................................................
6.5.5.2 Checking the time delay with mode of operation "forced bus zone unbalance" 6 - 55..........
6.5.6 General recommendations for setting the protection 6 - 55.................................
6.5.6.1 Busbar protection 6-55................................................................
6.5.6.2 Circuit-breaker failure protection 6 - 57...................................................
6.5.6.3 Supervisory functions 6 - 57............................................................
6.5.6.4 Overcurrent release of the bay trip command 6 - 58........................................
6.6 Commissioning with primary values 6 - 59................................................
6.6.1 Checking the current transformer polarity with the load current. 6 - 59.......................
6.6.2 Checking the connections of the circuit-breaker failure protection initiation inputs 6 - 60........
6.6.3 Checking the alarms and trip signals 6 - 60................................................
6.6.4 Switching the protection into service 6 - 60...............................................
7.1 Maintenance recommendation 7 - 1....................................................
7.2 Fault analysis 7-2....................................................................
7.2.1 Analysis of operational events 7 - 2.....................................................
7.2.2 Checking the auxiliary voltage supply 7 - 3...............................................
7.2.3 Replacement of fuses 7-3............................................................
7.2.4 Check of the LEDs on the modules 7 - 5................................................
7.2.5 Fault indication and analysis of the fault buffer 7 - 6.......................................
7.2.6 Analysis of failures in the communication ZE-FE 7 - 10.....................................
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