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7UT51 v3
17.4
Mounting the Relay Case ......................................................................................................................... 181
17.5
Wiring ....................................................................................................................................................... 183
17.5.1 Connection Diagrams ...............................................................................................................................184
17.6
Checking Connections.............................................................................................................................. 188
17.7
Replacing the Internal Fuse...................................................................................................................... 188
17.8
Installing or Replacing the Battery ............................................................................................................189
17.9
Changing the Rated Nominal Current of the Current Inputs..................................................................... 189
17.10
Changing the Rated Voltage of the Binary-Signal Inputs ......................................................................... 192
17.11
Changing the Normal Signal Position of the Fiberoptic Data Port ............................................................ 194
18 Field Testing and Commissioning ............................................................................................. 195
18.1
Preparation ............................................................................................................................................... 195
18.1.1 Physical Inspection ................................................................................................................................... 195
18.1.2 Energizing the Relay ................................................................................................................................ 196
18.1.3 Check Matching Factors ........................................................................................................................... 197
18.2
Preparation of Primary Tests .................................................................................................................... 197
18.3
Symmetrical Current Tests, Address Block 4100 ..................................................................................... 198
18.3.1 Tests Related to All Applications .............................................................................................................. 199
18.3.2 Tests Related to Protected Objects with Three Terminals ........................................................................ 201
18.4
Preparation for Zero Sequence Current Tests .......................................................................................... 202
18.4.1 Zero Sequence Tests - Address Block 4100............................................................................................ 202
18.4.2 Current Test for Restricted Ground Fault Protection, Address Block 41 .................................................. 203
18.5
Leaving Test Operation, Address Block 4800........................................................................................... 205
18.6
Checking The Coupling of External Trip Signals ...................................................................................... 205
18.7
Operational Checks .................................................................................................................................. 205
18.8
Energizing the Protected Object ............................................................................................................... 206
18.8.1 In-Service Readings ................................................................................................................................. 206
18.8.2 Operational Measured Values .................................................................................................................. 206
18.8.3 Measured Current Tests - Address Block 4100 ....................................................................................... 206
18.8.4 Waveform Capture during Test Fault Record - Address 4900 ................................................................. 207
18.9
Installation of 7UT51 Relay in Existing Circuit .......................................................................................... 208
18.9.1 Output Connections .................................................................................................................................. 208
18.10
Testing for In-Service Setting Changes .................................................................................................... 208
18.11
Putting the Relay into Operation............................................................................................................... 209
19 Maintenance and Servicing ........................................................................................................ 211
19.1
Troubleshooting Tips ................................................................................................................................ 211
19.2
Routine Checks ........................................................................................................................................ 211
19.3
When to Return a Relay ........................................................................................................................... 212
20 Settings Record ........................................................................................................................... 213
PRIM-2330C
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