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how did they get the scaled phasor diagram? how did they get the scales? break down simply really confused.

how did they get the scaled phasor diagram? how did they get the scales? break down simply really confused.

Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter6: Power Flows
Section: Chapter Questions
Problem 6.61P
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Q4 (Unbalanced Delta) R 12-j3 9+j0 Z t VAN Vay V=400V V, N VYN BN Y 8+j5 VRY 400230" IRY = = 44.4230" 920" ZRY 4002-90 9.43432 VYR Iya = 42.42-122" 4004150° VaR IBR = ZaR = 32.2Z164 12.42-14° Draw scaled phasor diagram to determine line currents IR, ly and la -lyB IRY VRY -lBR VRN w1 Scale: 1cm=10A w2 VRB VYN -IRY VyB Measured from the scaled phasor diagram:
Transcribed Image Text:Q4 (Unbalanced Delta) R 12-j3 9+j0 Z t VAN Vay V=400V V, N VYN BN Y 8+j5 VRY 400230" IRY = = 44.4230" 920" ZRY 4002-90 9.43432 VYR Iya = 42.42-122" 4004150° VaR IBR = ZaR = 32.2Z164 12.42-14° Draw scaled phasor diagram to determine line currents IR, ly and la -lyB IRY VRY -lBR VRN w1 Scale: 1cm=10A w2 VRB VYN -IRY VyB Measured from the scaled phasor diagram:
IR = 71210° Ir = 842-137" Is = 442100° The total real power (W) in the three phase load can be calculated as follows: PTotal = IRY.RRY+ IYE.RYa+ IsR.RBR Protat = 44.4 x9 +42.4 x8+32.2 x12 PTotal = 17.7kW +14.4kW +12.4kW PTotal = 44.5kW The total real power (W) can be calculated using the 2 Wattmeter method as follows: PTotal = Using values measured from the phasor diagram: PTotal = 400x71x Cos 40° + 400x84 x Cos 47° PTotal = 21.7 kW + 22.9kW PTotat = 44.6kW ie PRETTY CLOSE!!!! how did they get the scaled phasor diagram? how did they get the scales? break down simply really confused.
Transcribed Image Text:IR = 71210° Ir = 842-137" Is = 442100° The total real power (W) in the three phase load can be calculated as follows: PTotal = IRY.RRY+ IYE.RYa+ IsR.RBR Protat = 44.4 x9 +42.4 x8+32.2 x12 PTotal = 17.7kW +14.4kW +12.4kW PTotal = 44.5kW The total real power (W) can be calculated using the 2 Wattmeter method as follows: PTotal = Using values measured from the phasor diagram: PTotal = 400x71x Cos 40° + 400x84 x Cos 47° PTotal = 21.7 kW + 22.9kW PTotat = 44.6kW ie PRETTY CLOSE!!!! how did they get the scaled phasor diagram? how did they get the scales? break down simply really confused.
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