name 3 measuring instrument used in transformers

4 Answers  

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Whats the minimum value for I.R. that can be allowed for HT & LT alternators for operation?

1 Answers  

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why extension in transmission tower is made?

1 Answers  

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why the voltage and current in a long transmission line are called travelling wave?

0 Answers   UIU,

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In hydro plant,generally we install vertical hydro generators..why dont we recommend horizontal one??

1 Answers   Alstom,

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HOW DG WORKS ?

3 Answers  

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in Megger what type of voltage(AC or DC) are produce.how they work.

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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how to decide no of electrodes for 1600A LT Main incomer panel

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Why is ignitor used in sodium vapour lamp

1 Answers  

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What is annunciator ?

1 Answers  

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hey guys i recently saw a long transmission line in which a sort of balloons in red and white color were hanging at each section.do u have any idea why are they kept for?

3 Answers  

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