Answer / saurabh patel

In power transformer Generally TanDelta Test is carried out To Measure the Insulation Resistance of the Bushing of Transformer ,But You would have Doubt there IR is measures also by a MEGGER but Megger actually (Generally ) as 5KV DC in but in this megger The Insulation is Only Measured But In actually in Tan delta test The Insulation. property of Insulator which have a Capacitance Effect When In Loading Therefore this is Taken out to measures the Loss angle of Dielecrtic . Which is Delta (loss angle of Diectric material) .

can we use transformer for 70 Hz?

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how does the switching of capacitors in a capacitor bank take place when we use them at the load side to reduce the power factor?

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What is mean by retrofitting of machine tool please brief.

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why to use 50hz only in tansmisson and as well as in distribution why not60hz?

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State any two nuclear power stations in India, with their generating capacity.

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List any four conventional sources of energy.

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For example, if I use Star delta transformer for distribution, Can I Connect 230 V lighting load bewteen secondary phase & primary neutarl. What will be the effect, if I connect in this manner?

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why transformer core is eathed?

7 Answers   ECE,

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pf of synchronius motor is unity, is it axact(=one) value. ?

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sir please send me previous year questions of jspl of electrical section through which i could prepare myself fpr the test.

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simple way to find busbar sizes??

1 Answers   SPAC,

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A genarator is connected through a 20MVA ,13.8/138 KV stepdown transformer to a transmission line. at the reciving end of the line a load is supplied through a step down transformer of 10MVA,138/69 KV rating .A 0.72 PU load evaluated on load side transformer ratings as base values ,is supplied from the above system for system base values of 10 MVA and 69 KV in load circuit the value of the load in generator circuit will be ...........

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