GE L60 Instruction Manual page 8

9 THEORY OF
OPERATION
10 MAINTENANCE
viii
8.2.7 Sensitivity issues....................................................................................................................8-7
8.2.8 Single-pole tripping applications...................................................................................8-9
8.2.9 Phase distance.................................................................................................................... 8-10
8.2.10 Ground distance.................................................................................................................8-11
8.3 POTT signaling scheme.................................................................................8-11
8.3.1 Overview ................................................................................................................................ 8-11
8.4 Series compensated lines ............................................................................8-12
8.4.1 Distance settings................................................................................................................ 8-12
8.5 Understanding L60 oscillography...............................................................8-14
8.5.1 Overview ................................................................................................................................ 8-14
8.5.2 Two-breaker configuration ........................................................................................... 8-15
9.1 Overview ........................................................................................................... 9-1
9.1.1 Introduction .............................................................................................................................9-1
9.1.2 Fundamental principle of phase comparison .........................................................9-1
9.1.3 Variations in phase comparison schemes................................................................9-7
9.1.4 Phase comparison excitation..........................................................................................9-8
9.1.5 Blocking versus tripping schemes ............................................................................. 9-12
9.1.6 Single versus dual phase comparison ..................................................................... 9-20
9.1.7 Refinements to basic schemes.................................................................................... 9-22
9.1.8 Multi-terminal lines ........................................................................................................... 9-26
9.1.9 Charging current compensation ................................................................................ 9-26
9.1.10 L60 signal processing ...................................................................................................... 9-28
9.2 Single-pole tripping.......................................................................................9-36
9.2.1 Overview ................................................................................................................................ 9-36
9.2.2 Phase selection ................................................................................................................... 9-39
9.3 Fault locator ...................................................................................................9-41
9.3.1 Fault type determination................................................................................................ 9-41
10.1 Monitoring.......................................................................................................10-1
10.1.1 Devices with Site Targets ............................................................................................... 10-1
10.1.2 Data with Modbus Analyzer.......................................................................................... 10-1
10.2 General maintenance ...................................................................................10-3
10.2.1 In-service maintenance.................................................................................................. 10-3
10.2.2 Out-of-service maintenance ........................................................................................ 10-3
10.2.3 Unscheduled maintenance (system interruption) .............................................. 10-3
10.3 Retrieve files ...................................................................................................10-3
10.3.1 CyberSentry security event files.................................................................................. 10-4
10.4 Compare settings ..........................................................................................10-5
10.4.1 Compare against defaults ............................................................................................. 10-5
10.4.2 Compare two devices ...................................................................................................... 10-5
10.5 Back up and restore settings.......................................................................10-6
10.5.1 Back up settings .................................................................................................................10-6
10.5.2 Restore settings .................................................................................................................. 10-8
10.6 Upgrade software........................................................................................10-10
10.7 Upgrade firmware .......................................................................................10-11
10.8 Replace module............................................................................................10-12
10.9 Battery ...........................................................................................................10-14
10.9.1 Replace battery for SH/SL power supply ............................................................. 10-14
10.9.2 Dispose of battery .......................................................................................................... 10-15
10.10 Clear files and data after uninstall...........................................................10-18
10.11 Repairs...........................................................................................................10-19
10.12 Storage ..........................................................................................................10-19
L60 LINE PHASE COMPARISON SYSTEM - INSTRUCTION MANUAL
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