EasyManuals Logo

GE 845 User Manual

GE 845
552 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #6 background imageLoading...
Page #6 background image
IV 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Output Relays........................................................................................................................................4 - 127
Auxiliary Relay selected for breaker Trip..................................................................................4 - 130
Aux Relay selected for breaker Close.........................................................................................4 - 132
Auxiliary Output Relays ....................................................................................................................4 - 134
Critical Failure Relay #8....................................................................................................................4 - 135
Virtual Outputs ......................................................................................................................................4 - 136
Analog Outputs.....................................................................................................................................4 - 136
Protection....................................................................................................................................... 4 - 138
Percent Differential .............................................................................................................................4 - 140
Transformer Overload .......................................................................................................................4 - 151
Current Elements .................................................................................................................................4 - 153
Inverse Time Overcurrent Curves.................................................................................................4 - 153
Percent of Load-To-Trip....................................................................................................................4 - 160
Phase Time Overcurrent Protection (51P).................................................................................4 - 161
Phase Instantaneous Overcurrent Protection (50P) ............................................................4 - 164
Phase Directional Overcurrent Protection (67P)....................................................................4 - 166
Neutral Time Overcurrent Protection (51N).............................................................................4 - 169
Neutral Instantaneous Overcurrent Protection (50N).........................................................4 - 172
Neutral Directional Overcurrent Protection (67N) ................................................................4 - 175
Ground Time Overcurrent Protection (51G).............................................................................4 - 180
Ground Instantaneous Overcurrent Protection (50G).........................................................4 - 182
Ground Directional Overcurrent Protection (67G) ................................................................4 - 184
Restricted Ground (Earth) Fault (87G) .........................................................................................4 - 188
Negative Sequence Time Overcurrent Protection (51_2)..................................................4 - 193
Negative Sequence Instantaneous Overcurrent Protection (50_2)..............................4 - 195
Voltage Elements .................................................................................................................................4 - 198
Undervoltage Curves .........................................................................................................................4 - 199
Phase Undervoltage Protection (27P).........................................................................................4 - 200
Auxiliary Undervoltage (27X) ..........................................................................................................4 - 203
Phase Overvoltage Protection (59P)............................................................................................4 - 206
Auxiliary Overvoltage Protection (59X) ......................................................................................4 - 209
Neutral Overvoltage Protection (59N) ........................................................................................4 - 212
Negative Sequence Overvoltage Protection (59_2).............................................................4 - 215
Volts per Hertz (24) ..............................................................................................................................4 - 217
Power Elements....................................................................................................................................4 - 223
Directional Power (32)........................................................................................................................4 - 223
Frequency Elements...........................................................................................................................4 - 229
Underfrequency (81U) .......................................................................................................................4 - 229
Overfrequency (81O) ..........................................................................................................................4 - 232
Frequency Rate of Change (81R)..................................................................................................4 - 235
Monitoring...................................................................................................................................... 4 - 239
Transformer............................................................................................................................................4 - 239
Harmonic Derating..............................................................................................................................4 - 239
Thermal Elements................................................................................................................................4 - 242
Tap Changer Failure ...........................................................................................................................4 - 250
Trip and Close Circuit Monitoring .................................................................................................4 - 252
Breaker Arcing Current......................................................................................................................4 - 259
Breaker Health ......................................................................................................................................4 - 262
Functions .................................................................................................................................................4 - 266
Power Factor (55).................................................................................................................................4 - 266
Demand....................................................................................................................................................4 - 272
Pulsed Outputs......................................................................................................................................4 - 281
Digital Counters....................................................................................................................................4 - 284
Harmonic Detection ...........................................................................................................................4 - 287
RTD Temperature.................................................................................................................................4 - 290
RTD Trouble.............................................................................................................................................4 - 295
Loss of Communications..................................................................................................................4 - 296

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the GE 845 and is the answer not in the manual?

GE 845 Specifications

General IconGeneral
BrandGE
Model845
CategoryProtection Device
LanguageEnglish

Related product manuals