GE L60 Instructions Manual

Also see for L60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

GE L60 Instructions Manual Manual pdf 8 page image

viii L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUALTABLE OF CONTENTS8.1.2 Settings ......................................................................................................................................8-18.1.3 Settings example...................................................................................................................8-38.2 Distance/backup supervision...............................................................................8-48.2.1 Overview ...................................................................................................................................8-48.2.2 Lines with tapped transformers.....................................................................................8-58.2.3 Transformer load currents ...............................................................................................8-68.2.4 Low-voltage-side faults .....................................................................................................8-68.2.5 Transformer inrush current..............................................................................................8-68.2.6 Tractional load .......................................................................................................................8-78.2.7 Sensitivity issues....................................................................................................................8-78.2.8 Single-pole tripping applications...................................................................................8-98.2.9 Phase distance.................................................................................................................... 8-108.2.10 Ground distance.................................................................................................................8-118.3 POTT signaling scheme .......................................................................................8-118.3.1 Overview ................................................................................................................................ 8-118.4 Series compensated lines ...................................................................................8-128.4.1 Distance settings................................................................................................................ 8-128.5 Understanding L60 oscillography .....................................................................8-148.5.1 Overview ................................................................................................................................ 8-148.5.2 Two-breaker configuration ........................................................................................... 8-159 THEORY OFOPERATION9.1 Overview ..................................................................................................................9-19.1.1 Introduction .............................................................................................................................9-19.1.2 Fundamental principle of phase comparison .........................................................9-19.1.3 Variations in phase comparison schemes................................................................9-79.1.4 Phase comparison excitation..........................................................................................9-89.1.5 Blocking versus tripping schemes ............................................................................. 9-129.1.6 Single versus dual phase comparison ..................................................................... 9-209.1.7 Refinements to basic schemes.................................................................................... 9-229.1.8 Multi-terminal lines ........................................................................................................... 9-269.1.9 Charging current compensation ................................................................................ 9-269.1.10 L60 signal processing ...................................................................................................... 9-289.2 Single-pole tripping..............................................................................................9-369.2.1 Overview ................................................................................................................................ 9-369.2.2 Phase selection ................................................................................................................... 9-399.3 Fault locator ..........................................................................................................9-419.3.1 Fault type determination................................................................................................ 9-4110 MAINTENANCE 10.1 Monitoring .............................................................................................................10-110.1.1 Devices with Site Targets ............................................................................................... 10-110.1.2 Data with Modbus Analyzer.......................................................................................... 10-110.2 General maintenance ..........................................................................................10-310.2.1 In-service maintenance.................................................................................................. 10-310.2.2 Out-of-service maintenance ........................................................................................ 10-310.2.3 Unscheduled maintenance (system interruption) .............................................. 10-310.3 Retrieve files ..........................................................................................................10-310.3.1 CyberSentry security event files.................................................................................. 10-410.4 Convert device settings.......................................................................................10-510.5 Copy settings to other device ............................................................................10-710.6 Compare settings .................................................................................................10-710.6.1 Compare against defaults ............................................................................................. 10-710.6.2 Compare two devices ...................................................................................................... 10-810.7 Back up and restore settings .............................................................................10-810.7.1 Back up settings .................................................................................................................10-8