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Power Quality Analyzer
Requirements
- 3-phase voltage, current, frequency, measurement
- active, reactive, apparent power, power factor
- neutral current
- harmonics analysis up to 50th order
- quality - swell, dip, interruption, transient/over voltage, inrush current, unbalance rate
- real-time operation
- USB communication interface
AC sensors
AC voltage sensor
For three-phase balanced system, the sum of instantaneous values of phase voltages (as well as currents) is zero: vL1+vL2+vL3=iL1+iL2+iL3=0 In such case also uN1=uN2=0 and v1=vL1R11R11+R12
Voltage divider for measuring phase voltages - SPICE simulation schema
Normal grid conditions
Phase VL3 disconnected
VL2 & VL3 phases disconnected (only VL1 connected)
Power supply
Component | Max. consumption [mA] | # | Total consumption [mA] |
---|---|---|---|
ACS712 | 13 | 4 | 52 |
TL064 | 1 | 2 | 2 |
TL084 | 12 | 2 | 24 |
78xx/79xx | 6 | 3 | 18 |
Total | 94 |