Question

The symmetrical components of the phase c phase voltages at the load side are given:

zero = 100 +j5 volts

Positive = 100 + j 100 volts

Negative = 100 - j100 V

If the system is a 3phase, 3 wire with loads

Zan = 1.7327 cis (1.6535)

Zbn = 1.7327 cis (-56.654)

Zcn = 3 cis (-29.0452) and

connected to a balanced line impedance of 20 + j15 ohms, with the generating source, determine:

a. The line voltages at the source side.

Answer #1

A balanced ?-connected load has an impedance of 60+ j45 ? per
phase. The load is fed through a line having an impedance of 0.8+
j0.6 ? per line. The phase voltage at the terminals of the load is
???????? = 480 ?? . The sequence is positive. Use AB v as the
reference at the load. The source is required to be calculated for
either Wye or Delta connection. a) Draw the 3-phase system b) Draw
the a-phase equivalent...

A delta connected balanced load with impedance "20 - j15" is
connected to a star connected generator in positive sequence with
Van = "107.43 - j312". Calculate phase and line currents and
voltages, also draw the configuration described with the voltage
and current labels.

A 100 MVA, 13.2 kV three phase generator (G) having a
synchronous reactance of 10% is connected to a three phase Y-Y
transformer T1 which feeds a 132 kV 10 miles transmission line
having an impedance per phase of 2 + j5 ?/mile. At the receiving
end of the transmission line is a Y-Y step down transformer T2.
Three loads are connected to the secondary side of the transformer
T2. Loads are as follows:
Load#1 40 MVA at 0.8 pf...

A balanced wye-connected three-phase source has line-to-neutral
voltages of 400 V rms.
- Find the rms line-to-line voltage magnitude.
- If this source is applied to a wye-connected load composed of
three 33 Ω resistances, find the rms line-current magnitude.
- If this source is applied to a wye-connected load composed of
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The magnitude of the phase voltage of an ideal balanced
three-phase Y-connected source is 110 V . The source is connected
to a balanced Y-connected load by a distribution line that has an
impedance of 0.1+0.8i Ω/ϕ . The load impedance is 20.2+14.8i Ω/ϕ .
The phase sequence of the source is acb. Use the a-phase voltage of
the source as the reference.
Part A: Specify the magnitude and phase angle of the line
current IaA.
Part B: Specify the...

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