Answer / naveed

300 v

Answer / nur.asidik

for class 5P, Vkp is function of ALF,Rct, secondary ratio, and Rated burden, we need to know the Rct(CT resistance) 

can we use ACB for HT supply

2 Answers   Reliance,

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WHICH TYPE OF TRANSFORMER USED IN SWITCHYARD IN POWER PLANT?

15 Answers   GE, Lanco, NTPC,

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How to select the cable and voltage drop in circuit?

0 Answers   DEWA,

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what is dc system? how getting pulse from rectifier?

1 Answers   ETA,

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how we provide neutral earth on synchronising panel as per electrical standards?

0 Answers  

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what is the significance of per unit impedance ?

7 Answers   HP,

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what is necessity of using isolation transformer?

4 Answers   NTPC,

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whenever any squirrel or a crow falls on the transformer input line then there is a big explosion and 440 volts of power is being discharged through the neutral line due to which appliances in off mode are also burned.we have earthing for the transformer as well as the bus bar chamber.why is it happening?

1 Answers  

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how to choose cable size with respect to load? how to convert cable size in mm2 to sq.mm?

2 Answers   MSL,

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1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

0 Answers  

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How to calculate earth flat size for 250 Kva DG and transformer?

8 Answers   Deepak Fertilisers,

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why EMF IS INDUCED IN A CONDUCTOR WHEN FLUX LINKING WITH IT CHANGES ACCORDING TO FARADAYS LAW.

0 Answers   Sail,

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