Answer / vijay raskar

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Why the suply frequency in INDIA is 50HZ

5 Answers   HCL,

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CAN A CD/CLOCK RADIO WITH 110V 60HZ WORK ON A 110V 50HZ FEED.

3 Answers  

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C.S.R. and where are they use in electrical systems

1 Answers  

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Advantage of LT panel vs HT panel

0 Answers  

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What Maximam Gap Taibaar & Bush

0 Answers   Bajaj,

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which safety we have to take when we go for work?

2 Answers  

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Why we use series reactor in power system?

9 Answers   Cadbury, HEG, Uttam,

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DG cranking voltage?

0 Answers  

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why do we connect droop ct{in gensets}in y_phase only

2 Answers  

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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.

0 Answers  

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what is power ratio between star & delta connection of 3 phase induction motor

1 Answers  

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What are the test involved in DG auto synchronizing panel before in manufacturing place before dispatch.

2 Answers   L&T, TCS,

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