What is “pu” in electrical engineering?

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What is the function of auadag in a cro?

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1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

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WHAT WILL BE THE SPEED OF MOTOR IF NO.OF POLES ON STATOR ARE NOT EQUAL TO NO. OF POLES ON ROTOR.???

4 Answers  

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why do we need the body earth?

4 Answers  

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what is mean by induction & conduction principle ? how they differ from each other ? thank you

1 Answers  

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how the inner and outer body is separated in aircrafts?

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a.c&d.c motor&generator

2 Answers   Vizag Steel,

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what is the potential of 11kv A.B.Switch

1 Answers   Power Grid,

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why reactive power produce in generator? why inductive load absorbe reactive power?

2 Answers  

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Why do we will ground the positive terminal in electrostatic precipitator

1 Answers   JSW,

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what is the difference between grounding and earthing......how can we differentiate each other.....

2 Answers   Wipro,

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