Answer / mjk

Transformation ratio is Zsec = a(square) x Zpri

whereas, turn ratio is Ns/Np = Vs/Vp = Ip/Is

Answer / 7anoter4

The transformation ratio of a power transformer it is the ratio between primary
EMF [Electric Magnetic Force-the voltage induced by magnetic flow in a coil] and secondary EMF.This ratio equals the ratio between primary and secondary number of turns.

what is the voltage equation of 240/12 v transformer??

1 Answers  

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Operation of isolators.

0 Answers   KSEB, L&T, Siemens,

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Why electric traction is used ??

3 Answers   IOCL,

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difference between ground,neutral and earth?..

4 Answers  

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why the tapping of transformer on ht side??????

12 Answers   CTS, OPTCL, Visa Steel,

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why is the earthing pin on 3 pin top are big and thick

3 Answers   Marriott,

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Can anyone provide with a SLD for HT panel installation for a 33KV line and distribution end has three 1.5MV transformers. Is it suitable to use OCB or VCB and also provide me the suitable rating and its connection diagram.

0 Answers   TATA,

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what is phase voltage and line voltage? in line voltage how 415v is obtained?

9 Answers  

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What is distance protection relay? where & why we use this relay?

2 Answers   Siemens, UltraTech, Voltech,

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Less cost of delta connection over star connection a. No fourth neautral wire

1 Answers  

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1 HP = how many Kva

5 Answers  

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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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