how to calculate the lightning arrester conductor @ no of earth pits required

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Sir, I need a power supply at 380V. The supply I get in three phase is rated 415V. The total supply I have from the supply company is 70KW. Kindly inform if it is better to use a voltage stabiliser for this purpose or a transformer

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I had applied for JE in PSEB, Can you pls send me the Question bank for related to my field

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What will be the direction of rotation of a Alternator in case it goes in motoring action when connected with grid ?

6 Answers   DVC, NTPC,

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A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3

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circuit breaker work alone during fault condition or need any relays ?

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a 3 phase slip ring induction motor is wound for 4 poles on stator and 6 poles on rotor; when 3 phase balanced voltage source at 50 hz is applied to motor it will run at a)1500rpm b)1000rpm c)750 rpm d)zero rpm

13 Answers   Essar, PSPCL, PSTCL,

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What is oscillator circuit?

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Are you connected Transformer neutral eathing with it's body earthing or earthing met of switch yard.? Yes or No ? why ?

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what is the effect of change in supply frequency on load angle of synchronous motor,all other parameters remaining same?

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if only one generator is running in droop mode parrallel with grid and suddenly grid breaker off what will happen? It will trip o/u freq or stay as it is? (urgent)

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please send the IS strandard for electrical to sakthi_murugan86@yahoo.co.in

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