why substation ratings are multiple of 11 means 11\33 kv substation

6 Answers  

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i want bhel placement paper for electrical if anybody having pl send to my id kavitha867@myway.com immediately

0 Answers   Bhel,

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what is the maximim current drawn by 1 phase and three phase welding machine

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I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

0 Answers  

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What is UPS and How do you maintain the UPS Maintenance? Brief Description on UPS maintenance.

0 Answers   JLL, Nokia, Uttam Galva,

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I need bhel electrical test pattern & paper

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when transformer oil should be filtered/tested?

3 Answers  

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What is difference between start imitation and start interlock for 3 phase motor protection ?

0 Answers   Siemens,

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what is relay type VDG,CDG,VTT ect?

1 Answers   Bhel,

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hi all, can any one tell me a website or document on basic interview questions on plc for a fresh diploma candidate?

1 Answers  

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We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers  

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What is the phase relationship between the primary and secondary voltages of a transformer?

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