'(& )( )'& &) ( &!& ")& &$(( $# Ċ %&( $# #)" &&#$
I
page
II
Siemens AG ⋅ May 1998
3.1 Standards and guidelines 3 - 3.........................................................
3.2 Service conditions 3-5...............................................................
3.3 Inter-changeability 3-5...............................................................
3.4 Busbar protection 3-5................................................................
3.5 Circuit-breaker failure protection 3 - 6...................................................
3.6 General data 3-6....................................................................
3.7 Ancillary functions 3-7...............................................................
4.1 Operation of complete unit 4 - 1........................................................
4.2 Application functions 4-3.............................................................
4.3 Busbar protection 4-4................................................................
4.3.1 Basic principle 4-4...................................................................
4.3.1.1 Stabilization 4-5.....................................................................
4.3.1.2 Separate evaluation of half-cycles 4 - 7.................................................
4.3.1.3 Weighted evaluation of the initial values 4 - 9............................................
4.3.1.4 Response threshold, pick-up 4 - 10......................................................
4.3.1.5 Summary of the measuring method 4 - 10................................................
4.4 Special treatment of the stabilizing current for the check zone 4 - 12.........................
4.5 Isolator mimic 4-13...................................................................
4.5.1 Preferential treatment during busbar coupling via isolators 4 - 13............................
4.5.2 Processing of the isolator running status 4 - 13............................................
4.5.3 Isolator treatment during auxiliary voltage supply failure 4 - 13...............................
4.5.4 Treatment of the isolator states in the event of wire breakage 4 - 14.........................
4.5.5 Bypass transfer-busbar operation 4 - 14..................................................
4.5.6 Status of the feeder isolator 4 - 17.......................................................
4.6 Circuit-breaker failure protection 4 - 18...................................................
4.6.1 Circuit-breaker failure protection during a feeder short-circuit 4 - 18.........................
4.6.1.1 Breaker failure protection with current sensor 4 - 18.......................................
4.6.1.2 TRIP repetition with current sensor 4 - 19................................................
4.6.1.3 Unbalancing 4-20.....................................................................
4.6.1.4 Breaker failure protection with TRIP repetition and unbalancing 4 - 21........................
4.6.1.5 Pulse mode 4-23.....................................................................
4.6.1.6 Initiation by external breaker failure protection 4 - 24.......................................
To Next Page
Loading...
