Table Of Contents - GE L90 Instruction Manual

L90 Line Current Differential System

Table of contents

1 INTRODUCTION
2 PRODUCT
DESCRIPTION
L90 LINE CURRENT DIFFERENTIAL SYSTEM - INSTRUCTION MANUAL
1.1 Safety symbols and definitions ..................................................................... 1-1
1.1.1 General cautions and warnings .................................................................................... 1-1
1.2 For further assistance .................................................................................... 1-2
2.1 Product description......................................................................................... 2-1
2.1.1 Overview................................................................................................................................... 2-1
2.1.2 Features.................................................................................................................................... 2-3
2.2 Pilot channel relaying ..................................................................................... 2-5
2.2.1 Inter-relay communications............................................................................................ 2-5
2.2.2 Channel monitor ................................................................................................................... 2-7
2.2.3 Loopback test......................................................................................................................... 2-7
2.2.4 Direct transfer tripping ...................................................................................................... 2-8
2.3 Security.............................................................................................................. 2-8
2.4 Order codes .................................................................................................... 2-11
2.4.1 Order codes with enhanced CT/VT modules.........................................................2-12
2.4.2 Order codes with process bus modules ..................................................................2-19
2.4.3 Replacement modules .....................................................................................................2-26
2.5 Signal processing........................................................................................... 2-28
2.5.1 UR signal processing ........................................................................................................2-28
2.6 Specifications ................................................................................................. 2-30
2.6.1 Protection elements ..........................................................................................................2-31
2.6.2 User-programmable elements ....................................................................................2-40
2.6.3 Monitoring..............................................................................................................................2-42
2.6.4 Metering..................................................................................................................................2-43
2.6.5 Inputs .......................................................................................................................................2-44
2.6.6 Power supply ........................................................................................................................2-45
2.6.7 Outputs....................................................................................................................................2-46
2.6.8 Communication protocols..............................................................................................2-48
2.6.9 Inter-relay communications..........................................................................................2-49
2.6.10 CyberSentry security.........................................................................................................2-50
2.6.11 Environmental......................................................................................................................2-50
2.6.12 Type tests ...............................................................................................................................2-51
2.6.13 Production tests ..................................................................................................................2-51
2.6.14 Approvals ...............................................................................................................................2-52
2.6.15 Maintenance.........................................................................................................................2-52
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