====== 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 sensors ====
For three-phase balanced system, the sum of instantaneous values of phase voltages (as well as currents) is zero: $$v_{L1} + v_{L2} + v_{L3} = i_{L1} + i_{L2} + i_{L3} = 0$$ In such case also $$u_{N1} = u_{N2} = 0$$ and $$v_1 = v_{L1}\frac{R_{12}}{R_{11} +  R_{12}}$$
=== SPICE simulation ===
== Voltage divider for measuring phase voltages - SPICE simulation schema ==
{{ :projects:pq-anal:spice:pqa-acv-divider.png?direct&800 | SPICE simulation of AC voltage divider}}
== Normal grid conditions ==
{{ :projects:pq-anal:spice:pqa-acv-divider-sim1.png?direct | SPICE simulation - grid ok}}
== Phase VL3 disconnected ==
{{ :projects:pq-anal:spice:pqa-acv-divider-sim2.png?direct | SPICE simulation - VL3 phase disconnected }}
== VL2 & VL3 phases disconnected (only VL1 connected) ==
{{ :projects:pq-anal:spice:pqa-acv-divider-sim3.png?direct | SPICE simulation - VL2 & VL3 phases disconnected }}


==== Power supply ====
^ Component ^ Max. consumption [mA] ^ # ^ Total consumption [mA] ^
| ACS712 | 13 | 4 | 52 |
| TL064 (TL084) | 1 (12) | 2 | 2 (24) |
| 78xx/79xx | 6 | 3 | 18 |
| Total |  |  | 72 (94) |
===== Schema =====
== AC sensors ==
{{ :projects:pq-anal:schema:pqa-ac-sensors.png?direct&400 |AC sensors}}