Toshiba GR200 Series Instruction Manual page 6

Contents
Introduction ......................................................................................................................................... 1
1
Protection functions ...................................................................................................................... 2
Purposes of the protection ..................................................................................................... 2
1.1.1
Requirements in the protection functions ............................................................................ 2
1.1.2
Behavior of backup protections ............................................................................................. 4
1.1.3
Concepts of current differential protection (DIF) function .................................................. 6
1.1.4
Concepts of distance protection (ZS/ZG) function ................................................................ 6
1.1.5
Concepts of carrier command protection (DISCAR/DEFCAR) function ........................... 10
1.1.6
Tripping CB by the protection functions .............................................................................. 10
1.1.7
Autoreclosing CB (ARC) after the operation of the protection functions ........................... 11
1.1.8
Conventional applications .................................................................................................... 11
1.1.9
Control......................................................................................................................................... 12
General control function ...................................................................................................... 12
1.2.1
Control and monitoring application .................................................................................... 12
1.2.2
Monitoring and metering functions ........................................................................................... 13
Hardware overview ..................................................................................................................... 14
Symbols used in logical diagrams .............................................................................................. 15
Abbreviation................................................................................................................................ 19
Function Block (FB), Function ID, Signal number (Data ID) .................................................. 21
Relay application ............................................................................................................................... 23
2
Distance protection (ZS/ZG) ....................................................................................................... 24
Principle of distance measurement .................................................................................... 25
2.1.1
Equations in distance protection function .......................................................................... 29
2.1.2
Element characteristic in distance relay ............................................................................ 36
2.1.3
Common application for ZS and ZG .................................................................................... 50
2.1.4
Extended application ........................................................................................................... 58
2.1.5
Command protection feature .............................................................................................. 60
2.1.6
Scheme logic ........................................................................................................................ 65
2.1.7
Tips to set the main/remote backup relays ........................................................................ 81
2.1.8
Tips to set the distance zones for multi-terminal lines ...................................................... 85
2.1.9
ZS/ZG test ............................................................................................................................ 87
2.1.10
Setting .................................................................................................................................. 88
2.1.11
Data ID .............................................................................................................................. 104
2.1.12
Switch on to fault (SOTF-OC) ................................................................................................... 117
Scheme logic ....................................................................................................................... 118
2.2.1
Setting ................................................................................................................................ 120
2.2.2
Data ID .............................................................................................................................. 120
2.2.3
Distance carrier command protection (DISCAR) .................................................................... 121
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6F2S1915 (0.46)