Sel 421 - Page 27

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Date Code 20090715 SEL-421 Relay
List of Figures
Figure 6.24 Group 1 Line Configuration Settings: ACSELERATOR QuickSet..................................... U.6.32
Figure 6.25 Directional Settings:
ACSELERATOR QuickSet................................................................ U.6.32
Figure 6.26 Uploading Group 1 and Breaker Monitor Settings to the SEL-421................................. U.6.33
Figure 6.27 RELAY ELEMENTS LCD Screen Containing Elements F32Q and R32Q .................... U.6.33
Figure 6.28 Finding Phase-to-Phase Test Quantities........................................................................... U.6.36
Figure 6.29 Phase Distance Elements Settings:
ACSELERATOR QuickSet ......................................... U.6.37
Figure 6.30 RELAY ELEMENTS LCD Screen Containing Element MBC2 ..................................... U.6.38
Figure 6.31 Relay Status:
ACSELERATOR QuickSet HMI................................................................... U.6.40
Figure 6.32 Relay Status From a STATUS A Command on a Terminal ............................................. U.6.40
Figure 6.33 Compressed ASCII Status Message................................................................................. U.6.41
Figure 6.34 Compressed ASCII CST Command on a Terminal ......................................................... U.6.41
Applications Handbook
Figure 1.1 230 kV Overhead Transmission Line................................................................................. A.1.2
Figure 1.2 Circuit Breaker Arrangement at Station S.......................................................................... A.1.4
Figure 1.3 500 kV Parallel Overhead Transmission Lines ................................................................ A.1.18
Figure 1.4 Circuit Breaker-and-a-Half Arrangement: Station S, Line 1 ........................................... A.1.21
Figure 1.5 Quadrilateral Ground Distance Element Reactive Reach Setting.................................... A.1.26
Figure 1.6 Definition of Homogeneous Network .............................................................................. A.1.28
Figure 1.7 Tilt in Apparent Fault Impedance Resulting From Nonhomogeneity.............................. A.1.29
Figure 1.8 Nonhomogeneous Angle Setting...................................................................................... A.1.30
Figure 1.9 Current Distribution During Cross-Country Fault ........................................................... A.1.42
Figure 1.10 Simplified POTT Scheme KEY1/KEY3 Logic................................................................ A.1.43
Figure 1.11 345 kV Tapped Overhead Transmission Line .................................................................. A.1.52
Figure 1.12 Circuit Breaker Arrangement at Station S........................................................................ A.1.55
Figure 1.13 Reverse Zone 3 Coordination........................................................................................... A.1.60
Figure 1.14 Impedance Diagram ......................................................................................................... A.1.61
Figure 1.15 Load-Encroachment Function.......................................................................................... A.1.65
Figure 1.16 345 kV Tapped Line Negative-Sequence Network .......................................................... A.1.70
Figure 1.17 345 kV Tapped Line Zero-Sequence Network................................................................. A.1.72
Figure 1.18 DC Schematic for DCB Trip Scheme .............................................................................. A.1.77
Figure 1.19 230 kV Parallel Underground Cables............................................................................... A.1.85
Figure 1.20 Circuit Breaker Arrangement at Station S, Cable 1 ......................................................... A.1.88
Figure 1.21 Quadrilateral Ground Distance Element Reactive Reach Setting .................................... A.1.93
Figure 1.22 Circuit to Determine Network Homogeneity ................................................................... A.1.95
Figure 1.23 Apparent Fault Impedance Resulting From Nonhomogeneity ........................................ A.1.95
Figure 1.24 Nonhomogeneous Angle Setting...................................................................................... A.1.96
Figure 1.25 External Ground Fault.................................................................................................... A.1.100
Figure 1.26 Negative-Sequence Fault Current Distribution-External Ground Fault ......................... A.1.102
Figure 1.27 Reverse Unbalanced Fault on Cable Circuit (Shunt Admittance).................................. A.1.106
Figure 1.28 500 kV Power System .................................................................................................... A.1.116
Figure 1.29 OOS Characteristic Settings Parameters ........................................................................ A.1.118
Figure 1.30 Calculating Setting R1R7............................................................................................... A.1.120
Figure 1.31 Swing Trajectory to Determine the OSBD Setting ........................................................ A.1.121
Figure 1.32 Inner Blinders................................................................................................................. A.1.124
Figure 1.33 OST Characteristics........................................................................................................ A.1.128
Figure 1.34 230 kV Example Power System..................................................................................... A.1.134
Figure 1.35 Circuit Breaker Arrangement at Station S...................................................................... A.1.135
Figure 1.36 Potential Sources............................................................................................................ A.1.136
Figure 1.37 500 kV Power System .................................................................................................... A.1.138
Figure 1.38 Partial Circuit Breaker-and-a-Half Arrangement at Station S, Line 1 ........................... A.1.140
Figure 1.39 Potential Sources............................................................................................................ A.1.143
Figure 1.40 Scheme 1 All Faults and Scheme 2 Multiphase Fault Timing Diagram ........................ A.1.151
Figure 1.41 Scheme 2 Single-Phase Fault Timing Diagram.............................................................. A.1.152
Figure 1.42 230 kV Power System for Circuit Breaker Failure Scheme 1........................................ A.1.152
Figure 1.43 Timing Diagram for Setting BFPU1—Scheme 1........................................................... A.1.154
Figure 1.44 Circuit Breaker Failure Trip and Circuit Breaker Trip DC Connections ....................... A.1.157
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