Answer / anurag pattanayak

1)check megger value..phase to phase and phase to ground
2) check phase resistance and inductance
3) check phase continuity

how is working the auto transformer?

1 Answers  

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WHAT IS THE MINIMUM IR VALUE FOR CABLE CHARGING

4 Answers   Google,

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What is the meaning of 40X8X2 busbar dimensions for carring load of 400 Amps

0 Answers  

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If not maintained 3 phase clearance,what happened ?

2 Answers  

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a voltmeter shows 100v..wat is to be done to make it read 150v.

7 Answers  

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generally the electrical equipments not to be operated at leading power factor, why?

2 Answers  

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what is the effect of leading power factor on Power transformers in existing in major power utility

2 Answers  

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what is tan delta measurement?..... why that terminal is earthed.....?

4 Answers   Power Grid,

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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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7. A resistance of 30 ohm is connected across 240v supply. If a resistance R ohm is connected in parallel with 30ohm resistor across the same supply, the current drawn becomes triple of original one The unknown resistor R is

2 Answers  

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In a 132KV Grid Station where voltage level is 132KV, here,  why the rating of Surge arrests installed 120KV ? 

1 Answers  

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why the motor running in delta connection ? it can be in star?

13 Answers   NTPC,

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