Siemens SIPROTEC 7SS52 User Manual

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Siemens AG ⋅ May 1998
Figure 4.9 Treatment of check-zone 4 - 12......................................................
Figure 4.10 Isolator status indications 4 - 13......................................................
Figure 4.11 Transfer (bypass) bus operation with closed busbar isolator 4 - 17.........................
Figure 4.12 Parallel feeders 4-17...............................................................
Figure 4.13 Basic scheme "current sensor" 4 - 19.................................................
Figure 4.14 Basic scheme "TRIP repetition with current sensor" 4 - 19..............................
Figure 4.15 Basic scheme "unbalancing" 4 - 20...................................................
Figure 4.16 Principle of unbalancing circuit-breaker failure protection 4 - 21...........................
Figure 4.17 Flow-chart for TRIP repetition and unbalancing 4 - 22...................................
Figure 4.18 Basic scheme "pulse operation" 4 - 23................................................
Figure 4.19 Basic scheme "autonomous circuit breaker failure protection" 4 - 24......................
Figure 4.20 Circuit-breaker failure during busbar short-circuit 4 - 24.................................
Figure 4.21 Breaker failure protection function with busbar short-circuit 4 - 25........................
Figure 4.22 Fault on bus zone BBA and failure of the bus coupler circuit breaker 4 - 25.................
Figure 4.23 Minimum duration for TRIP command 4 - 26...........................................
Figure 4.24 Allocation of the bus coupler currents with only one bus coupler current transformer 4 - 27.
Figure 4.25 Short-circuit in the dead zone 4 - 27..................................................
Figure 4.26 Short-circuit in the dead zone with the CB open 4 - 27..................................
Figure 4.27 Bus coupler with 2 CT's (overlapping measurement) 4 - 28...............................
Figure 4.28 Switching onto earthed busbar 4 - 28.................................................
Figure 4.29 Trip test with circuit breaker 4 - 29....................................................
Figure 4.30 Trip test with circuit breaker 4 - 30....................................................
Figure 4.31 Characteristic for measured value supervision 4 - 33....................................
Figure 4.32 Basic diagram 4-36................................................................
Figure 5.1 Connection of the current inputs of the bay units in bus
couplers with only one current transformer 5 - 2......................................
Figure 5.2 Example current transformer polarity 5 - 3............................................
Figure 5.3 Location of the jumpers on the module EFE (bay unit) 5 - 5.............................
Figure 5.4 Location of the jumpers on the module EAZ1 (master unit) 5 - 6.........................
Figure 5.5 Location of the coding switches and jumpers on the module ZPS 5 - 7...................
Figure 5.6 Triple busbar with transfer bus (TB) 5 - 9..............................................
Figure 5.7 Double busbar with combi-bus (AB) 5 - 10.............................................
Figure 6.1 Operation tree bay unit 6 - 35........................................................
Figure 6.2 Test set-up for testing the characteristic for the bus-section specific protection 6 - 50......
Figure 6.3 Test set-up for the check zone 6 - 51.................................................
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Siemens SIPROTEC 7SS52 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SS52
Category	Protection Device
Language	English