Siemens 7UT51 User Manual

7UT51 v3 Contents
PRIM-2330C 9
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

Siemens 7UT51 Specifications

General

Brand	Siemens
Model	7UT51
Category	Relays
Language	English