what is the meaning of Dd0yn11

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What is meant by inverse definite mean time (IDMT)& definitemean time (DMT)?

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Why is the generator rating always in kVA and motor rating in kW?

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volts=230 c=10mf a=??

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In how we connect watt meter for open & short circuit test of a single phase transformer.

2 Answers   Sail,

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what is doid

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Material commonly used in making transformer core is A cast iron B mild steel C high silicom steel D high carbon steel

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What is domestic transformer? Draw the connection of domestic transformer.

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Hi,Any one has idea regarding the KPTCL Recuirtments for AE'e & JE's for the year of 2009-10???Kindly help in regards..

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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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Which is is best option for 33 kv line incomer.I am Desinging the panel for new projects and i would like to get Your opinion on this Vcb or sf6. Please help me with your replies. Thanks D p singh

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why the supply power frequency is 50hz in india? where as it is 60hz in US?

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