METREL MI 2792 PowerQ4 Plus, Instruction Manual

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MI 2792 PowerQ4 Plus
Table of contents
4
3.13 Events table.....................................................................................................61
3.14 Alarms table ....................................................................................................65
3.15 Memory List.....................................................................................................66
3.15.1 Record......................................................................................................68
3.15.2 Waveform snapshoot ...............................................................................70
3.15.3 Waveform record......................................................................................71
3.15.4 Inrush/Fast logger ....................................................................................71
3.15.5 Transients record .....................................................................................71
3.16 Measurement Setup menu ..............................................................................71
3.16.1 Connection setup .....................................................................................72
3.16.2 Event setup ..............................................................................................74
3.16.3 Alarm setup ..............................................................................................74
3.16.4 Signalling setup........................................................................................76
3.17 General Setup menu .......................................................................................76
3.17.1 Communication ........................................................................................77
3.17.2 Time & Date .............................................................................................79
3.17.3 Language .................................................................................................79
3.17.4 Clear Memory...........................................................................................80
3.17.5 Instrument info .........................................................................................81
3.17.6 Lock/Unlock..............................................................................................81
4 Recording Practice and Instrument Connection ...............................................83
4.1 Measurement campaign ..................................................................................83
4.2 Connection setup ............................................................................................87
4.2.1 Connection to the LV Power Systems ......................................................87
4.2.2 Connection to the MV or HV Power System.............................................90
4.2.3 Current clamp selection and transformation ratio setting .........................91
4.2.4 Temperature probe connection ................................................................95
4.2.5 GPS time synchronization device connection ..........................................96
4.2.6 GPRS modem connection........................................................................97
4.3 Number of measured parameters and connection type relationship ...............98
5 Theory and internal operation ...........................................................................101
5.1 Measurement methods..................................................................................101
5.1.1 Measurement aggregation over time intervals .......................................101
5.1.2 Voltage measurement (magnitude of supply voltage) ............................101
5.1.3 Current measurement (magnitude of supply current) .............................102
5.1.4 Frequency measurement .......................................................................102
5.1.5 Phase power measurements..................................................................103
5.1.6 Total power measurements....................................................................103
5.1.7 Energy....................................................................................................104
5.1.8 Harmonics and interharmonics...............................................................105
5.1.9 Signallling...............................................................................................106
5.1.10 Flicker.....................................................................................................107
5.1.11 Voltage and current unbalance ..............................................................108
5.1.12 Voltage events .......................................................................................109
5.1.13 Alarms ....................................................................................................111
5.1.14 Data aggregation in GENERAL RECORDING .......................................112
5.1.15 Waveform snapshoot .............................................................................116
5.1.16 Waveform record....................................................................................116
5.1.17 Transient recorder ..................................................................................117
5.1.18 Inrush/Fast recorder ...............................................................................117