7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

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How to calculate VCB rating for 33KV ,25 MW Power line?

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Name two types of electrical analogous for mechanical system.

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send me any model test paper of clerical post of state bank of india.......

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In EB metering we face problem kva jump even in no load condition.can any one help to control this

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why did the BDV test in transformer?

2 Answers   Jindal Steel and Power,

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To determine the Healthiness of Insulation we will be performing Dielectric tests i.e Insulation Resistance test, Partial Discharge test,Switching Impulse, Lightning impulse, Tan Delta test ...etc why we required to perform this many test, why cant we do only one test. for Transformer, CT's

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Why 15Amp. MCB is suitable to carry load of 1.5Ton Ac please Explain?

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in industrial lighting in each circuit how many lamps can be given? and how much load can be put on each circuit? is there standard for this? please help me with the standard description?

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why the supply frequency in india is 50hz?

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What are disadvantages of capacitor

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is it ok to switch lights from a mcb instead of switches

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