Answer / e.saravanan

KVA = SQRT(3)X V X I

What is the role of the 50 STUB protection at a GIS 400KV substation with SIEMENS protection relays?

0 Answers   Power Plant,

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I want d.g.set our company

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diff. between tension mode & speed mode

0 Answers   BSL,

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define digital electronic

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basic princple of induction and synchronous motor

1 Answers  

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please send me jindal previous aptitude and technical question and answer.my email id is deep_raj@live.com

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What is a commutator?

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What is the difference between Earthing & grounding

4 Answers  

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What is harmonics and how the 1st,2nd,3rd etc harmonic levels

2 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?

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after syncnhronistion how generator speed controlled by grid

3 Answers  

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what is the role of impedance in transformer?based on secondary f.l.current(139 amps) and impedance(4.07) of 415/415v of 100 kva transformer. what is the primary current?

1 Answers  

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