Answer / anil pareek

bypass diode-to eliminate shading effect and hot spots are
avoided on modules.
blocking diodes-To avoid reverse flow of current.

What is disadvanage if power factor goes to in leading..?

0 Answers  

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AMF (auto mains failure) control for DG sets at home.

1 Answers  

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who is make controlling in the reactive power that genarted in AS genrator(the exitaion currnt or exitation voltge)

2 Answers  

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why protection and metering CT's are always connected in star why not in delta?

5 Answers   Reliance,

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Can u tell me design of switch yard

0 Answers   NTPC,

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how to calculate unit consumption on 3phase 380-415 v0lt kilowatt motor eg ( 55kw,380v,3phase 50-60hz)

1 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.

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what is hormonics. how it is generated & what are the problem faced by that.

5 Answers   APC,

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What is force on a conductor in a magnetic field ?

0 Answers  

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what is the preventive @ predective maintenance

2 Answers  

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how much test voltage should applied for tan delta test.

2 Answers   Electrical, TATA,

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Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632

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