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--- projects:power_quality_analyzer [2019/09/15 15:02]
admin [AC voltage sensor]
+++ projects:power_quality_analyzer [2019/09/15 16:01] (current)
admin [Schema]
@@ Line 9: / Line 9: @@
   * USB communication interface
 ===== AC sensors =====
-==== AC voltage sensor ====
+==== 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}}
-{{ :projects:pq-anal:spice:pqa-acv-divider-sim1.png?direct&800 | SPICE simulation - grid ok}}
+== Normal grid conditions ==
-{{ :projects:pq-anal:spice:pqa-acv-divider-sim2.png?direct&800 | SPICE simulation - VL3 phase disconnected }}
+{{ :projects:pq-anal:spice:pqa-acv-divider-sim1.png?direct | SPICE simulation - grid ok}}
-{{ :projects:pq-anal:spice:pqa-acv-divider-sim3.png?direct&800 | SPICE simulation - VL2 & VL3 phases disconnected }}
+== 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 |
-| TL084 | 12 | 2 | 24 |
+| TL064 (TL084) | 1 (12) | 2 | 2 (24) |
 | 78xx/79xx | 6 | 3 | 18 |
-| Total |  |  | 94 |
+| Total |  |  | 72 (94) |
 ===== Schema =====
+== AC sensors ==
 {{ :projects:pq-anal:schema:pqa-ac-sensors.png?direct&400 |AC sensors}}