Three identical impedances Z Δ = 30 ∠ 30 ° Ω are connected in Δ to a balanced three-phase 208-V source by three identical line conductors with impedance Z L = ( 0.8 + j 0.6 ) Ω per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance ( − j 60 ) Ω per phase is connected in parallel with the load.
Three identical impedances Z Δ = 30 ∠ 30 ° Ω are connected in Δ to a balanced three-phase 208-V source by three identical line conductors with impedance Z L = ( 0.8 + j 0.6 ) Ω per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance ( − j 60 ) Ω per phase is connected in parallel with the load.
Solution Summary: The line-to-line voltage at the loads terminals is 203.1angle 0.649°V. In Delta -connected network, the phase current is equal to
Three identical impedances
Z
Δ
=
30
∠
30
°
Ω
are connected in
Δ
to a balanced three-phase 208-V source by three identical line conductors with impedance
Z
L
=
(
0.8
+
j
0.6
)
Ω
per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance
(
−
j
60
)
Ω
per phase is connected in parallel with the load.
Practice1
A single-phase step-down transformer of 83 kVA, nominal voltages 24kV/230 V, frequency 60 Hz is available.The following test parameters are available:Pfe = 216 W, Io = 2% Pcc = 1083 W, Vcc = 4%
Determine:a. Parameters Rcc, Xcc and Rfe of the equivalent circuit referring to the secondary.b. Relative voltage drops. εcc, εrcc, εxcc
A single-phase step-down transformer of 83 kVA, nominal voltages 24kV/230 V, frequency 60 Hz is available.The following test parameters are available:Pfe = 216W, Io = 2%, Pcc = 1083W, Vcc = 4%
Determine:
If the transformer is connected to 24 kV, a load Zc, fp = 0.866 in arrears, is installed in the secondary transformer, which consumes the nominal current. Calculate:• Transformer voltage regulation (perform calculations by PU's)• Maximum efficiency.
The magnetic circuit shown in the figure is made of TRAN-COR material, the flow magnetic power on the right arm (BCDE) is 6 x 10 -4 Wb. (disregard marginal effects anddispersion)
Calculate the current in the 200-turn coil
Chapter 2 Solutions
MindTap Engineering for Glover/Overbye/Sarma's Power System Analysis and Design, 6th Edition, [Instant Access], 1 term (6 months)
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