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projects:power_quality_analyzer [2019/09/15 15:02] admin [AC sensors] |
projects:power_quality_analyzer [2019/09/15 16:01] (current) admin [Schema] |
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| * USB communication interface | * USB communication interface | ||
| ===== AC sensors ===== | ===== AC sensors ===== | ||
| - | ==== AC voltage sensor ==== | + | ==== AC voltage sensors ==== |
| - | {{ :projects:pq-anal:schema:pqa-acv-divider.png?direct&800 | SPICE simulation of AC voltage divider}} | + | 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 $$v_1 = v_{L1}\frac{R_{12}}{R_{11} + R_{12}}$$ |
| - | {{ :projects:pq-anal:spice:pqa-acv-divider-sim1.png?direct&800 | SPICE simulation - grid ok}} | + | === SPICE simulation === |
| - | {{ :projects:pq-anal:spice:pqa-acv-divider-sim2.png?direct&800 | SPICE simulation - VL3 phase disconnected }} | + | == Voltage divider for measuring phase voltages - SPICE simulation schema == |
| - | {{ :projects:pq-anal:spice:pqa-acv-divider-sim3.png?direct&800 | SPICE simulation - VL2 & VL3 phases disconnected }} | + | {{ :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 ==== | ==== Power supply ==== | ||
| ^ Component ^ Max. consumption [mA] ^ # ^ Total consumption [mA] ^ | ^ Component ^ Max. consumption [mA] ^ # ^ Total consumption [mA] ^ | ||
| | ACS712 | 13 | 4 | 52 | | | ACS712 | 13 | 4 | 52 | | ||
| - | | TL084 | 12 | 2 | 24 | | + | | TL064 (TL084) | 1 (12) | 2 | 2 (24) | |
| | 78xx/79xx | 6 | 3 | 18 | | | 78xx/79xx | 6 | 3 | 18 | | ||
| - | | Total | | | 94 | | + | | Total | | | 72 (94) | |
| ===== Schema ===== | ===== Schema ===== | ||
| - | {{ :projects:projects:pq-anal:pqa-ac-sensors.png?direct&400 |AC sensors}} | + | == AC sensors == |
| + | {{ :projects:pq-anal:schema:pqa-ac-sensors.png?direct&400 |AC sensors}} | ||
