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what is a bus post insulator? explain its application in a substation.

1 Answers   Enercon, HAL,

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What is cable tray, its type, and its support?

0 Answers  

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sail kaott diploma ece ke interviw me qus.kis parkar ke aate hai aur G.S me kya puchate hai kya sameedyaan me kis parkar ke qu.puchate hai

0 Answers   Sail,

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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 are the main faults of DC generators?

0 Answers   Mercantile Marine Department,

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what should be the resistance valve of healthy earth pit

1 Answers   Reddy Labs,

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how many voltage or current enough to kill a person?

12 Answers  

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hi , i have 150 kw loud and we need 50 m cabil,i want to know wich size cabil we use. thanks

0 Answers  

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How many safety of Disel Generator

5 Answers   Sail,

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When and where resistance earthing is used ? How to calculate the time constant for earth fault

0 Answers  

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What are the advantages and disadvantages of negative feed back?

0 Answers  

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What happen if you keep open the Neutral Grounding Switch in open condition of the HT Generator at starting and again on load if it open then?

1 Answers  

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