3P AC Circuits

For an unbalanced load which connection is suitable?

A 200 V, three-phase source is connected to two equal impedances of 7.07 + j7.07 ohms in parallel, with both connected in wye. What is the current per phase of the combination?

Two-wattmeters can be used to measure three-phase power for a

Three 40 Ω non-inductive resistances are connected in delta across 200 V, 3-phase lines. Calculate the power taken from the mains if one of the three resistors is disconnected.

Power in a balanced three-phase system is measured by the two wattmeter method and it is found that the ratio of the two readings is 2:1. What is the power factor of the system?

For a three phase unbalanced load

The phase b line voltage and the phase a line current of a balanced three phase system are \(v = 220\sin(\omega t + 210^\circ)\) and \(i = 10\sin(\omega t - 30^\circ)\), respectively. What is the power of the system?

Three 40 Ω non-inductive resistances are connected in wye across 200 V, 3-phase lines. If one of the resistors is disconnected, what would be the power taken from the mains?

A 220 V, 3-phase supply has a balanced delta connected load with impedance of 15 + j20 Ω/phase. What is the total real power of the load in watts?

A delta connected load of 9 + j12 Ω/phase is supplied by a 230 V, 3-phase source through a line with an impedance of 0.06 + j0.12 Ω/conductor. Find the load voltage in volts.

A balanced wye-connected load with resistance of 8 Ω/phase and no reactance is supplied by a 240v, 3-phase source. Find the real power of the load in watts.

In a balanced three phase wye connected circuit, the line voltages are equal

In a wye connected system, line current is

A balanced delta load of 3+j4 ohms per phase is connected to a balanced 110v source. Find the line current.

Three identical resistors are connected in wye across 220 v, 3-phase lines. The line current is12.7 A. To what value in volts should the line voltage be changed the same line current with the resistors connected in delta?

A delta 3Φ, 4-wire secondary 230/115 V would have a high-leg to neutral voltage of ________.

Convert the delta connected impedance of \(12\angle 36^\circ\) Ω to a balanced wye connected impedance.

The type of ac distribution system commonly used to supply both light and power is the

In a balanced 3-phase voltage source with phase sequence abc, the phase A voltage is \(127\angle 0^\circ\) volts. Find the phase C voltage.

A 220 V, 3-phase, 4-wire abc system supplies unbalanced wye-connected resistances of 10 Ω, 15 Ω, and 20 Ω. Determine the total power of the system in watts.