GE PQMII Instruction Manual

Contents

CHAPTER 4: SOFTWAREPQMII POWER QUALITY METER – INSTRUCTION MANUAL 4–134.5 Power Analysis4.5.1 Waveform CaptureTwo cycles (64 samples/cycle) of voltage and current waveforms can be captured anddisplayed on a PC using the EnerVista PQMII Setup Software or third party software.Distorted peaks or notches from SCR switching provides clues for taking corrective action.Waveform capture is also a useful tool when investigating possible wiring problems due toits ability to display the phase relationship of the various inputs. The waveform capturefeature is implemented into EnerVista PQMII Setup Software as shown below.Select the Actual > Power Analysis > Waveform Capture menu item. The EnerVista PQMIISetup Software will open the Waveform Capture dialog box.Select the buttons on the left to display the desired waveforms. The waveform values forthe current cursor line position are displayed to the right of the selected buttons.Numerical values are displayed directly below the button.4.5.2 Harmonic AnalysisNon-linear loads such as variable speed drives, computers, and electronic ballasts cancause harmonics which may lead to problems such as nuisance breaker tripping,telephone interference, transformer, capacitor or motor overheating. For fault diagnosissuch as detecting undersized neutral wiring, need for a harmonic rated transformer oreffectiveness of harmonic filters; details of the harmonic spectrum are useful and availablewith the PQMII and the EnerVista PQMII Setup Software.The EnerVista PQMII Setup Software can perform a harmonic analysis on any of the fourcurrent inputs or any of the three voltage inputs by placing the PQMII in a high speedsampling mode (256 samples/cycle) where it will sample one cycle of the user defined