Table of Contents
IdGh - High Set Restricted Ground Fault Protection IdGH...................................................................................673
I - Overcurrent Protection [50, 51,51Q, 51V, 67].................................................................................................. 677
IH2 - Inrush.......................................................................................................................................................... 712
IG - Ground Fault [50N/G, 51N/G, 67N/G]........................................................................................................... 717
I2> and %I2/I1> – Unbalanced Load [46].............................................................................................................744
I2>G – Generator Unbalance Protection [46G]....................................................................................................753
LoE - Loss of Excitation [40]................................................................................................................................ 763
ThR-Protection Module: Thermal Replica [49].....................................................................................................777
V/f> - Volts/Hertz [24].......................................................................................................................................... 786
InEn - Inadvertent Energization [50/27]................................................................................................................ 792
OST – Out of Step Tripping [78]........................................................................................................................... 798
Z – Phase Distance Protection [21]...................................................................................................................... 815
LB – Load Blinder (Load Encroachment)............................................................................................................. 844
PSB – Power Swing Blocking [68]....................................................................................................................... 850
SOTF - Switch Onto Fault.................................................................................................................................... 863
CLPU - Cold Load Pickup.................................................................................................................................... 870
V - Voltage Protection [27,59].............................................................................................................................. 878
VG, VX - Voltage Supervision [27A, 27TN/59N, 59A]..........................................................................................891
f - Frequency [81O/U, 78, 81R]............................................................................................................................ 902
V 012 – Voltage Asymmetry [47].......................................................................................................................... 927
Sync - Synchrocheck [25].................................................................................................................................... 934
Q->&V< Reactive-Power/Undervoltage Protection..............................................................................................958
Reconnection Module.......................................................................................................................................... 969
LVRT – Low Voltage Ride Through [27(t)]........................................................................................................... 997
Intertripping (Remote)........................................................................................................................................ 1013
PQS - Power [32, 37]......................................................................................................................................... 1021
PF - Power Factor [55]....................................................................................................................................... 1041
ExP - External Protection................................................................................................................................... 1050
Ext Temp Superv Protection Module – External Temperature Supervision........................................................1056
Ext Oil Temp Protection Module – External Oil Temperature Protection............................................................1063
Sudden Pressure Protection Module – Sudden Pressure Protection.................................................................1069
RTD Protection Module [26].............................................................................................................................. 1075
URTDII Module Interface................................................................................................................................... 1106
Supervision.................................................................................................................................................. 1116
CBF- Circuit Breaker Failure [50BF*/62BF].......................................................................................................1116
TCS - Trip Circuit Supervision [74TC]................................................................................................................ 1141
CTS - Current Transformer Supervision [60L]...................................................................................................1151
LOP - Loss of Potential...................................................................................................................................... 1157
Phase Sequence Supervision............................................................................................................................ 1169
Self Supervision................................................................................................................................................. 1170
Programmable Logic.................................................................................................................................... 1175
General Description........................................................................................................................................... 1175
Programmable Logic at the Panel...................................................................................................................... 1180
Commissioning ........................................................................................................................................... 1186
Commissioning/Protection Test ........................................................................................................................ 1187
Putting out of Operation – Plug out the Relay....................................................................................................1188
Service and Commissioning Support...........................................................................................................1189
General.............................................................................................................................................................. 1189
Phase Sequence............................................................................................................................................... 1189
Forcing the Relay Output Contacts.................................................................................................................... 1190
Forcing RTDs*................................................................................................................................................... 1193
Forcing Analog Outputs*.................................................................................................................................... 1194
Forcing Analog Inputs*...................................................................................................................................... 1195
8 MCDGV4 DOK-HB-MCDGV4-2E
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