Answer Posted / mike.vikram

Circuit breaker is the device such as ACB's or MCCB's which
trips the entire system if there is a failure. By the entire
system we mean the elements connected to the particular
busbar of that crcuit breaker.
An isolator is used to cut out a portion of a substation
when a fault has occured on a particular portion of the
whole station to rectify it and repair it and in the
meanwhile the other devices operatee without being affected
by the faulty part.

What should be setting for alarm,tripping and cooling fan on for power transformer's oil temp. and winding temp. indicator?

1987

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what irequirment need to be followed when working on live equipment

1845

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Which are resistive loads & which one are inductive loads : Refrigerator, Split air conditioner, ceiling fans, well pump, fluoresecent bulbs, T.V, CRT Monitors, Adsl Routers, C.P.U, Printers, Deep Freezers, Speakers, DVD Players, Microwave oven etc. ? Output Power for these Appliances Would be same like this : P = V * A * P.F Or would be changed ? thanks

4023

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How to detect voltage vector shifting in interconnection protection.

1962

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which types of relay used in acb and vcb?

2795

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What is the function of electron gun assembly used in crt?

1238

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Efficient electrical earthing in hard rock area

1628

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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.

2110

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what is effect of 5amp fuse on 2mva pry protection of transformer

1916

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what are the steps involved in generator load test?

1610

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how we calculate torque ? how we improve it ?where torque will either motor or generator ?

2113

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why the field winding in dc motor is not short circuited eventhough dc supply is applied across the winding

1898

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What is the maximum breakdown voltage of 11KVA and 66 KVA power line and how it is calculated?

2350

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1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve

2053

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hi if anybody got model questions for cpcl Grade'A' electrical engineer position.send it to my mail please krishkumar22@gmail.com

2075

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