GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 6

8. COMMISSIONING
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TABLE OF CONTENTS
7.2.6 CRC-16 ALGORITHM ........................................................................................7-4
7.2.7 MESSAGE TIMING ............................................................................................7-4
7.3 MODBUS FUNCTIONS
7.3.1 SUPPORTED MODBUS FUNCTIONS...............................................................7-5
7.3.2 EXCEPTION RESPONSES................................................................................7-8
7.3.3 READING THE EVENT RECORDER.................................................................7-8
7.3.4 READING TRACE MEMORY .............................................................................7-9
7.3.5 ACCESSING DATA VIA THE USER MAP .........................................................7-9
7.3.6 FUNCTION CODE SUBSTITUTIONS ..............................................................7-11
7.3.7 MEMORY MAP ORGANIZATION.....................................................................7-12
7.4 MODBUS MEMORY MAP
7.4.1 745 MEMORY MAP ..........................................................................................7-13
7.4.2 MEMORY MAP DATA FORMATS....................................................................7-48
7.5 DNP COMMUNICATIONS
7.5.1 DEVICE PROFILE DOCUMENT ......................................................................7-61
7.5.2 IMPLEMENTATION TABLE .............................................................................7-63
7.5.3 DNP POINT LISTS ...........................................................................................7-64
8.1 GENERAL
8.1.1 INTRODUCTION ................................................................................................8-1
8.1.2 TESTING PHILOSOPHY ....................................................................................8-1
8.1.3 SAFETY PRECAUTIONS ...................................................................................8-2
8.1.4 CONVENTIONS .................................................................................................8-2
8.1.5 TEST EQUIPMENT ............................................................................................8-3
8.2 PRELIMINARY WORK
8.2.1 DESCRIPTION ...................................................................................................8-4
8.2.2 DIELECTRIC STRENGTH TESTING .................................................................8-5
8.3 LOGIC INPUTS AND OUTPUT RELAYS
8.3.1 LOGIC INPUTS ..................................................................................................8-6
8.3.2 OUTPUT RELAYS ..............................................................................................8-6
8.4 DISPLAY, METERING, COMMUNICATIONS, AND ANALOG OUTPUTS
8.4.1 DESCRIPTION ...................................................................................................8-7
8.4.2 CURRENT INPUTS ............................................................................................8-7
8.4.3 VOLTAGE INPUT ...............................................................................................8-8
8.4.4 TRANSFORMER TYPE SELECTION ................................................................8-8
8.4.5 AMBIENT TEMPERATURE INPUT ....................................................................8-9
8.4.6 ANALOG OUTPUTS.........................................................................................8-11
8.4.7 TAP POSITION.................................................................................................8-11
8.5 PROTECTION SCHEMES
8.5.1 PRECAUTIONS ................................................................................................8-12
8.5.2 HARMONIC RESTRAINED PERCENT DIFFERENTIAL .................................8-12
8.5.3 INSTANTANEOUS DIFFERENTIAL PROTECTION ........................................8-17
8.5.4 PHASE TIME OVERCURRENT .......................................................................8-17
8.5.5 PHASE INSTANTANEOUS OVERCURRENT .................................................8-19
8.5.6 NEUTRAL TIME OVERCURRENT...................................................................8-20
8.5.7 NEUTRAL INSTANTANEOUS OVERCURRENT.............................................8-21
8.5.8 GROUND TIME OVERCURRENT....................................................................8-22
8.5.9 GROUND INSTANTANEOUS OVERCURRENT..............................................8-24
8.5.10 RESTRICTED GROUND FAULT......................................................................8-25
8.5.11 NEGATIVE SEQUENCE TIME OVERCURRENT ............................................8-27
8.5.12 NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT ......................8-28
8.5.13 FREQUENCY ...................................................................................................8-29
8.5.14 OVEREXCITATION ..........................................................................................8-34
8.5.15 INSULATION AGING........................................................................................8-35
8.5.16 TAP MONITOR FAILURE.................................................................................8-35
8.6 AUXILIARY PROTECTION AND MONITORING FUNCTIONS
8.6.1 THD LEVEL SCHEME ......................................................................................8-36
8.6.2 HARMONIC DERATING FUNCTION ...............................................................8-37
8.6.3 TRANSFORMER OVERLOAD .........................................................................8-37
745 Transformer Management Relay GE Multilin