Answer / suresh

diffrential relay used in generator for sense the winding
fualt

Answer / saad

That works on difference of two current thats why known as
diffrential relay for example two cts one on generator
phase ct and other r on neutral side both cts passing for
example 5amps but the direction of current iz opposite so
the resultant iz zero that senses the relay if there is any
fault in the generator so the current increase on fault
side and the dirrence current increase and relay trip the
CB that iz the protection of generator transformer winding

Answer / musa

diffrential relay main protection for generator and
transformer ,between protection area not for outage short
circuit

Answer / ashish umrao

the diffrential relay used in which position when proctect
the specfice jone like feeder ,tranfromer ,bus bar,has a not
fluctuate the voltage .but generator has a variable load so
voltage are up and down so dose not use the this relay.

What is P.F? Formula for calculating PF in HT side?

1 Answers  

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what is diff. between earthing grid,earthing mess, earting grid?

0 Answers   Century Rayon, Emco, Tailor Solution,

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difference between cable and conductor?

6 Answers   TransOcean,

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If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.

0 Answers   MEIL,

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Sir,In our company there are 3 caterpillar make(capacity:(1) 3.3KV,2.5MW(2)3.3KV,2.5MW & (3)3.3KV,1.9MW) & 1 deutz make (capacity:11KV,3.8MW)gas engines utilised,all are running in paralell. There are three transformer utilised,(1) 6.25MVA,3.3KV/22KV,Impedence voltage:6.7% used for two generator,both are 2.5MW(2)5.5MVA,3.3KV/22KV,Impedence voltage:7.2% used for one generator of 2.5MW & (3) 5.5MVA,11KV/22KV,Impedence voltage:7.8% used for one generator of 2.5MW.all generator breakers capacity of 1250Amps. Sir,I want the details of fault level calculation of generator,transformer individually & for whole system. If you require any information from me.feel free for contact me sir.pl.send the answer of my question as the earliest as possible.

0 Answers   Piramal Healthcare,

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Where the Dry type tranformers are used.

5 Answers  

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Basic philosophy of applying 3P tripping for uptill 132KV switchyards & for 132KV & above 1P/3P tripping is used.

1 Answers   L&T,

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2 Answers  

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is 60hz freq better than 50 hz?&why?

1 Answers  

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Comparative difference between 33Kv & 66KV for transmitting the load of 7 MW at a distance of 34 Km.

6 Answers   NHPC,

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why t/f are rated in kva. is it conserned with p.f.

3 Answers  

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How to calulate cable size for 200KVA,160KVA& 40KVA load?

1 Answers   ABB,

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