GE D60 - Commands and Targets; Commands

GE Multilin D60 Line Distance Protection System vii
TABLE OF CONTENTS
7. COMMANDS AND
TARGETS
7.1 COMMANDS
7.1.1 COMMANDS MENU .......................................................................................... 7-1
7.1.2 VIRTUAL INPUTS.............................................................................................. 7-1
7.1.3 CLEAR RECORDS ............................................................................................ 7-2
7.1.4 SET DATE AND TIME ....................................................................................... 7-2
7.1.5 RELAY MAINTENANCE .................................................................................... 7-3
7.1.6 PHASOR MEASUREMENT UNIT ONE-SHOT.................................................. 7-4
7.1.7 SECURITY ......................................................................................................... 7-5
7.2 TARGETS
7.2.1 TARGETS MENU............................................................................................... 7-6
7.2.2 TARGET MESSAGES ....................................................................................... 7-6
7.2.3 RELAY SELF-TESTS......................................................................................... 7-6
8. THEORY OF OPERATION 8.1 DISTANCE ELEMENTS
8.1.1 INTRODUCTION................................................................................................ 8-1
8.1.2 PHASOR ESTIMATION ..................................................................................... 8-1
8.1.3 DISTANCE CHARACTERISTICS ...................................................................... 8-2
8.1.4 MEMORY POLARIZATION................................................................................ 8-6
8.1.5 DISTANCE ELEMENTS ANALYSIS .................................................................. 8-7
8.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
8.2.1 DESCRIPTION................................................................................................. 8-11
8.2.2 EXAMPLE ........................................................................................................ 8-14
8.3 GROUND DIRECTIONAL OVERCURRENT
8.3.1 DESCRIPTION................................................................................................. 8-16
8.3.2 EXAMPLE ........................................................................................................ 8-16
8.4 SERIES COMPENSATED LINES
8.4.1 DESCRIPTION................................................................................................. 8-18
8.5 SINGLE-POLE TRIPPING
8.5.1 OVERVIEW...................................................................................................... 8-21
8.5.2 PHASE SELECTION........................................................................................ 8-24
8.5.3 COMMUNICATIONS CHANNELS FOR PILOT-AIDED SCHEMES ................ 8-26
8.5.4 PERMISSIVE ECHO SIGNALING ................................................................... 8-33
8.5.5 PILOT SCHEME / PHASE SELECTOR COORDINATION.............................. 8-34
8.5.6 CROSS-COUNTRY FAULT EXAMPLE ........................................................... 8-35
8.6 FAULT LOCATOR
8.6.1 FAULT TYPE DETERMINATION..................................................................... 8-36
9. APPLICATION OF
SETTINGS
9.1 APPLICATION GUIDELINES
9.1.1 INTRODUCTION................................................................................................ 9-1
9.1.2 IMPACT OF MEMORY POLARIZATION ........................................................... 9-1
9.1.3 HIGH-SET OVERCURRENT ELEMENTS......................................................... 9-1
9.2 DISTANCE ELEMENTS (STEPPED DISTANCE SCHEME)
9.2.1 PHASE DISTANCE............................................................................................ 9-2
9.2.2 GROUND DISTANCE ........................................................................................ 9-3
9.3 PROTECTION SIGNALING SCHEMES
9.3.1 OVERVIEW........................................................................................................ 9-6
9.3.2 DIRECT UNDER-REACHING TRANSFER TRIP (DUTT) ................................. 9-6
9.3.3 PERMISSIVE UNDER-REACHING TRANSFER TRIP (PUTT)......................... 9-6
9.3.4 PERMISSIVE OVER-REACHING TRANSFER TRIP (POTT) ........................... 9-6
9.3.5 HYBRID POTT SCHEME (HYB-POTT) ............................................................. 9-7
9.3.6 DIRECTIONAL COMPARISON BLOCKING...................................................... 9-8
9.3.7 DIRECTIONAL COMPARISON UNBLOCKING................................................. 9-9
9.4 SERIES COMPENSATED LINES
9.4.1 INTRODUCTION.............................................................................................. 9-11
9.4.2 DISTANCE ....................................................................................................... 9-11
9.4.3 GROUND DIRECTIONAL OVERCURRENT ................................................... 9-12