Answer Posted / nidal rafeeque

Specifically, these curves denotes the instantenous
tripping current, if fault current crosses the designated
mark.

B : 2-5 times the rated current.
C: 5-10 " " " "
D : 10-15 " " " "


C- curves type are used for heavy currents in normal
working.(e.g. Heaters, Gyesers, Irons)

D-curves types are used for heavy inrush currents.(Motors
etc)

temp of cast resin 1500kva tx formerwent up to 138.c but came down very fast to about 100.c within 20 mins when load was reduced from 70% to 60%

1913

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in my industry we are using 3 step up transformers for induction heaters..i.e 415/580v and other are 11/440v.in power consumption does a step trnsformer makes any difference compared to step up?? plz explain

1845

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Why the efficiency of generator is more than motor in swinburne's test

2013

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WHAT IS MEANT BY DERATING OF THYRISTOR?

2956

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1.what is the funtion of chiller primary & scondary pumps. 2.what is the use of distribution lines & Types. 3.what is the use the thermal power stations & how much capacity.

1971

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what is the concept of directional power?

2009

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Where voltage are high and current to be interrupted is low the breaker preferred is:

2279

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What is “pu” in electrical engineering?

1127

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HOW TO CALCULATE THE VT SIZING?

3127

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if we have 320KVA Genset kindly advice how much load we can put it.

1517

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If the feeder rating is 7.5 kw or 10 HP star-delta feeder, MCCB is taken as 63 a, contactors-32 a, how much will be the OLR rating or which range OLR should be considered when we concern about type-2 coordination?

2310

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33kv Rated output avilable in market (any where in india)

2073

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who can measure the size of power cable?

2144

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i have flexible wire. size of conductors is 0.190 mm & no.of conductors are 48. then size of wire comes 1.37 sqmm instead of 1.5 sqmm . the what is tolerance for this size.

1782

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if in 3-phase system voltage=440V,frequency=60Hz, current=400A. then if it is single phase then current=? and if it is single phasing then current=?

2544

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