Answer Posted / john sundararaj

First decide on which type of cable
type of insulation,single core or 3 core
Ans 8 is the right one.Always go by the manufacturers
recommendation.The values differs for each standards and varies for different countries/utilities.Most of them prefer
soak test rather than hipot.

how we control automatic generator i'e with to supply (main supply and local generator) when the main supply was break to supply the local supply automatically to begin supplying power.I now this control circuit is the combination of contactor time delay contactor switch and overload relay .but my question is how we combine those component thank you

1984

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State norton’s theorem?

1090

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With a phasor diagram show the effect of increasing the field current of a generator supplying a constant real power and connected to a grid system.

1948

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What will happen to the protection and metering, if the polarity of a single or two PT/PTs in three phase system is reversed? Please provide reference if any.

2170

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How can get elongation of 2 k.G aluminium, if elongated aluminium dia is 2.5 mm?

2284

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What is the restart inhabit setting in ABB spam150c relay (Motor protection relay)

3634

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what is the difference between gas group b and gas group c electrical equipment construction wise?

1855

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how the inner and outer body is separated in aircrafts?

1078

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IF TVM OF TRANSFORMER SHOWS POWER FACTOR ON 33 KV SIDE AS 0.97 LAGGING AND ON 132 KV SIDE IS 0.75 LEADING.IS THIS CORRECT.WHERE IS PROBLEM.

2348

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What is Tachometer used to measure?

1230

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In dc ckt. 24v or 110v, which one is more efficient and why?

2224

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Why armature rheostat is kept in maximum position?

1089

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which types of relay used in acb and vcb?

2722

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What are the specifications for getting approval of Substation?

1922

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What are the various kind of cables used for transmission?

1082

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