Answer / k.prakashchandra

Fusing current for a round wire is approximately is equal to
k d^3/2 Amps.d=dia in mm, k=80 for copper, 12.8 for tin and
59 for Al.Fusing factor =minimum fusing current/current
rating of fuse.This value should be more than one and is
usually two.

Answer / karthik_elec

fuse is calculating with fuse factor, for example,
if u want to protect one equipment, that equipment taking 10 amps, if u put 10 amps fuse, that fuse will operate in 14.5 amps 4 hrs continues running, fuse factor is 1.45, fuse operating current = 1.45(fuse factor)*10(fuse rating). that means 14.5A 4hrs continues running. this is from IEC (INTERNATIONAL ELECTRO TECHNICAL COMMISSION)

why we testing the core balance of the transformer before comissioning?

0 Answers  

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WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings?

5 Answers  

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how the calculation is done if the DG set require for the -- -48 to -51v 4000 ah battery set .

1 Answers   BSNL,

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if harmonics is generates on the secondary side of transformer then why we put LC ckt on prim side?(i m talking abt rectiformer transformer)

0 Answers  

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2 Answers   ACC, Al-Jaber, Dubai Group, ECEC,

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0 Answers  

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wat is the difference between BE &BTECH.

8 Answers  

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Why not instal the NGR in 11kv/433kv trasformer?

3 Answers  

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What is PCCB?

3 Answers   ICEL, Schneider,

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what is differance between kvarh $ kvah

1 Answers  

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what is the different types of cable lugs?

2 Answers   Green Power, Kum Yang,

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