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light speedd

how to make an earthing certificate

2242

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List the disadvantages of constant k filters?

1666

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What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.

1347

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Is the theorem applicable to ac sources?

1040

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1.what is difference in maintain Hz again Hz in USA ? 2.how to calculate the battery AH? 3.why are yearly maintained in transformer how many tests in required?

2776

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what is subtransient , transient and steady stateac components

2169

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what are the advantage and dis-advantage of 3 phase 4 wire energy meter?

2189

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List examples of voltage source?

1028

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Hi,I am working in abroad for more than 3 years in a company operating with 11kv and 6.4 MW power. I need c licence in India,can I? some other says only i can get if i work for 2 years in india only! anybody kindly clarify by doubt.Thanks

1853

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How does "OUT OF STEP" relay ,for Synchronous motor protection, work?

4343

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how do we calculate length of starting time and repeated starting of a direct online starter?

1978

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how hydrogen cooled alternator undergo maintanence ? that is hydrogen when come in contact with air can result into explosions .

1914

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how to control the speed to switched reluctance motor

1945

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physical identification of HT & LT panel

1675

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What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

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