Question

A 70.7 (line voltage) three phase star connected source is connected to a balanced delta load having impedance of 14.14 + j14.14 ohms for each phase. Assuming abc sequence, find

a) Line currents

b) Total 3 phase power

Answer #1

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 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 balanced Y-connected 50Hz three-phase source has phase voltage
? ?=400V. Each phase of the load consists of a 0.1-farad
capacitance series with a 50-Ω Find the line currents, and the line
voltages. Assuming that the phase angle of ??? is 5.

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...

Three star-connected coils are drawing line current of 30A from
a three phase supply. Also, total apparent and active powers of
25kVA and 11 kW respectively are absorbed by the coils. By assuming
that the each coil is characterized by equal impedance,
determine:
i. the line and phase voltages
ii. the total reactive power (1 mark) iii. the impedance of each
coil.
c) If the coils in Q2(b) are suddenly reconfigured into delta
connection,
calculate the new line currents and...

The line current of a three-phase engine in delta configuration
is 25 A, connected to a supply network with a line voltage of 240 V
and absorbing a power of 15 kW. The efficiency of the engine is
90%.
Taking as a reference of line voltages V1= V∠0º, and a direct
sequence, find:
a) The phasors of the line voltages
b) The phasors of the line and phase currents
c) The reactive and apparent power
d) The mechanical power (at...

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
three 33 Ω resistances, find the total power delivered.

A three phase balanced resistive load has a line voltage VL =
381.05 V and line current IL = 30 A. Calculate 1) the total power
taken by the load 2) the power taken by each phase of the load.

A wye connected three-phase source is delivering a line voltage
of 480 V at a line current of 25 amperes.
Find
a) the phase voltage
b) the phase current
c) the line voltage
d) the line current
e) the total power delivered.

A Wye-Delta transformer is connected to a 66 kV input
three-phase transmission line. Each transformer is rated at 1000
kVA and has a step-down ratio of 8:1. The bank supplies a balance
load having a power factor of 0.8 lag with a load current of 70 A.
Assume ideal transformer, determine.
The primary line and phase voltages
The secondary line and phase voltages
The secondary line and phase currents
The apparent and active power at the load
Total kVA capacity...

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