Answer Posted / raghava235

when a transformer is over heated ,more hydrogen content is
released from the transformer oil when burns when reaches
air at the top of tank ...so conservator is used to allow
hydrogen flow upto it between which a BUCHolz relay get
operated.

in general it is observed in power stations, the tertiary winding is used in higher rating Y-Y auto transformer but not in Y-Y power transformer. is the tertiary winding is compulsory then why it is not using in power transformer 

1810

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what is the benefit of floating our DC source? if i have two floating DC source of which 1 has a ref voltage of -21VDC and the other of -18VDC. can it be connected in parallel to share a common ref voltage? if not, how do i make both sources to be of common ref voltage? tks

1899

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what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY

2205

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Why is the air gap between the pole pieces and the armature kept very small?

1404

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the site measured knee point voltage of protection class CTs should be greater than rated knee point voltage? what about meetering class CTs. Should it be below the rated knee point voltage?

2290

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How generating electric power export to grid from the generating station ?

1883

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what is the requirement regarding earthing of Single conductor with AWA

2253

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what is the relative size of single and three phase?

1893

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What are locations arc protection relay is fixed.

1883

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What is the approximate value of stacking factor?

1161

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induction 3 phase motor terminal connection

2670

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what is strip power factor?

2169

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what is the difference between ups & inverter

7164

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in HT service 3ph 4 wire service Y-phase voltage shows zero . whether it is meter fault? or what be the reason ? if y-ph voltage zero ,can current is recorded? reasons for failure?

1931

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Explain the role of a car driver as one of a feedback mechanism.

1191

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