Schweitzer Engineering SEL-351P - Page 260

ii Trip and Target Logic Date Code 990215
SEL-351P Manual Técnico
Use Existing SEL-321 Relay DCUB Application Guide for the SEL-351P Recloser
Control ........................................................................................................................
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External Inputs....................................................................................................................
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PT1, PT2 – Received Permissive Trip Signal(s).........................................................
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LOG1, LOG2 – Loss-of-Guard Signal(s) ...................................................................
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Timer Settings.....................................................................................................................
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GARD1D – Guard-Present Delay...............................................................................
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UBDURD – DCUB Disable Delay .............................................................................
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UBEND – DCUB Duration Delay ..............................................................................
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Logic Outputs......................................................................................................................
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UBB1, UBB2 – Unblocking Block Output(s).............................................................
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PTRX1, PTRX2 – Permissive Trip Receive Outputs .................................................
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Installation Variations.........................................................................................................
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Directional Comparison Blocking (DCB) Logic........................................................................
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Use Existing SEL-321 Relay DCB Application Guide for the SEL-351P Recloser
Control ........................................................................................................................
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External Inputs....................................................................................................................
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BT – Received Block Trip Signal(s)...........................................................................
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Timer Settings.....................................................................................................................
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Z3XPU – Zone (Level) 3 Reverse Pickup Time Delay ..............................................
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Z3XD – Zone (Level) 3 Reverse Dropout Extension .................................................
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BTXD – Block Trip Receive Extension .....................................................................
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67P2SD, 67N2SD, 67G2SD, 67Q2SD – Level 2 Short Delay ...................................
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Logic Outputs......................................................................................................................
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DSTRT – Directional Carrier Start.............................................................................
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NSTRT – Nondirectional Carrier Start.......................................................................
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STOP – Stop Carrier ...................................................................................................
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BTX – Block Trip Extension ......................................................................................
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Installation Variations.........................................................................................................
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Additional Front-Panel Status and Target LED Information .....................................................
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A, B, and C Target LEDs....................................................................................................
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Target Reset/Lamp Test Front-Panel Pushbutton...............................................................
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Other Applications for the Target Reset Function......................................................
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FIGURES
Figure 5.1: Trip Logic................................................................................................................................5-2
Figure 5.2: Minimum Trip Duration Timer Operation (see bottom of Figure 5.1)...................................
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Figure 5.3: Three-Pole Open Logic (top) and Switch-Onto-Fault Logic (bottom) ...................................
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Figure 5.4: Communications-Assisted Tripping Scheme ..........................................................................
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Figure 5.5: Permissive Input Logic Routing to POTT Logic ..................................................................
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Figure 5.6: POTT Logic...........................................................................................................................
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Figure 5.7: Permissive Input Logic Routing to Trip Logic .....................................................................
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Figure 5.8: SEL-351P Recloser Control Connections to Communications Equipment for a Two-
Terminal Line POTT Scheme ......................................................................................
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Figure 5.9: SEL-351P Recloser Control Connections to Communications Equipment for a Three-
Terminal Line POTT Scheme ......................................................................................
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Figure 5.10: DCUB Logic........................................................................................................................
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