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In a balanced threephase systemdelta load, if we assume the line voltage is V_{RY} = V∠0⁰ as a reference phasor. Then the source voltage V_{YB} is?
As the line voltage V_{RY} = V∠0⁰ is taken as a reference phasor. Then the source voltage V_{YB} is V∠120⁰.
In a deltaconnected load, the relation between line voltage and the phase voltage is?
In a deltaconnected load, the relation between line voltage and the phase voltage is line voltage = phase voltage.
If the load impedance is Z∠Ø, the expression obtained for current (I_{Y}) is?
As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the Y impedance is I_{Y }= V_{YB}∠120⁰/Z∠Ø = (V/Z)∠120Ø.
A threephase balanced delta connected load of (4 + j8) Ω is connected across a 400V, 3 – Ø balanced supply. Determine the phase current I_{R}. Assume the phase sequence to be RYB.
Taking the line voltage V_{RY} = V∠0⁰ as a reference V_{RY }= 400∠0⁰V, V_{YB} = 400 ∠ 120 ⁰V and V_{BR} = 400∠240⁰V. Impedance per phase = (4 + j8) Ω = 8.94∠63.4⁰Ω. Phase current I_{R} = (400∠0o)/(8.94∠63.4o )= 44.74 ∠ 63.4⁰A.
Power is defined as the product of voltage and current. So the power drawn by the load is P = 3V_{Ph}I_{Ph}cosØ = 24kW.
In a balanced threephase systemdelta load, if we assume the line voltage is V_{RY} = V∠0⁰ as a reference phasor. Then the source voltage V_{BR} is?
As the line voltage V_{RY} = V∠0⁰ is taken as a reference phasor. Then the source voltage V_{BR} is V∠240⁰.
If the load impedance is Z∠Ø, the current (IR) is?
As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the R impedance is I_{R} = V_{BR}∠0⁰/Z∠Ø = (V/Z)∠Ø.
If the load impedance is Z∠Ø, the expression obtained for current (I_{B}) is?
As the load impedance is Z∠Ø, the current flows in the three load impedances and the current flowing in the B impedance is I_{B} = V_{BR}∠240⁰/Z∠Ø = (V/Z)∠240Ø.
In wye or star connection _____________ of the three phases are joined together within the alternator.
In wye or star connection, similar ends of the three phases are joined together within the alternator. The common terminal so formed is referred to as the neutral point or neutral terminal.
The voltage between ______________ is called line voltage.
The voltage between line and line is called line voltage. And the voltage between line and neutral point is called phase voltage. The currents flowing through the phases are called the phase currents, while those flowing in the lines are called the line currents.
22 docs274 tests

22 docs274 tests
