Answer / guest

we all know that resistance arises due to the collision of
electrons with other atoms n electrons... the molecular
structure of conductor are in such a way that it offers
less resistance to the flow of electrons

what are the different pre- commissioning tests performed on distribution transformer, power cable and switchgear?????

1 Answers   Reliance,

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HT/LT PANEL TEST?ALL TEST

0 Answers  

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What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?

2 Answers  

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please tell me when we start motor without load in star or delta connection whose current above condition,pl write formula

0 Answers   Foxconn,

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what is dyn 11

3 Answers  

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refrigeration cycle?

1 Answers   MAHINDRA, Shapoorji Pallonji Group(SPCL),

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How check electrical motor winding.

4 Answers   DRJ ARDE,

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how many earthing should need for UPS, where its connected

7 Answers   HCL,

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How transformer neutralshould earthed ? Transformer neutral connected to earth mat in substations, right or wrong ?

4 Answers  

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Dear All, In a 400V power system, ratio of three current transformers installed incoming switchgear is 4000/1. Maximum three phases short circuit current of this system is 48kA. One CT is installed on neutral of upstream transformer (6/0.42kV, solidly earthed) for 51G protection. Would you please inform me about the correct CT ratio of this current transformer (on neutral)?? Thanks a million

2 Answers  

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lightning arrester rating selection procedure: (line to line voltage(kV)/(squ.root of 3))*squ.root of 2. now the question is, IS this above formula correct for both STAR and DELTA connected system???

1 Answers  

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assume we are put both df/dt and vector surge relay in same bus the df/dt relay setting is +5 hz an -5HZ. we want operat the vector surge relay before the df/dt how i calculate the setting of the vector surge relay.

1 Answers  

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