Answer / rachuri_sree

The cuurrent in the secondary of the arc furnace will be
very high i.e. in kA. Hence the secondary will be devided
into no. of small bus bars and will be connected to the 3
electrodes to form a Delta, using copper hollow tubes and
flexible hoses. Water will be circulating in the copper
tubes for providing cooling. There will be a provision to
change the primary connection either in star or in delta.
Three single phase transformers can also be used instead of
only one 3 phase transformer.

Sir, My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50mm2. Now client asking us to reduce cable size by increasing runs. Sir, My question now when my mind strikes with 2 options 1) Divide load 74/2 = 36 and calculate cable for 36+36 making it 2 runs or 2) Simply i can divide 50mm2 /2 ie. 2 runs of 25mm2 Please suggest me sir

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if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?

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Why we are designed only 11Kv and 6.6Kv Alternators, not 33Kv Alternators and Power Transmission side we are designed only 220kv, 120kv, 66kv, 33kv, 11kv, and 440volts, not 20kv, 50kv, 100kv.

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how to check the continuity of a cable with a megger

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what voltage generated earth tester meter when we testing the Earth point ?

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why transmission voltages are in multiple of 11kv?

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Thermal withstand capability under full short circuit conditions, in terms of number of times of occurrence of short circuit and corresponding anticipated percentage reduction in transformer life.

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What should be the value of earth resistance for an instrumentation/electronic circuit? As per which IS/IEC Code?

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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?

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what is different between IP55,IP54 and IP66?

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we have taken HV test of 2.5 k and Megger test on 11 kv HT cable.here it shows no fault but when we are charging the same cable with 11 kv supply why the VCB 11 kv gets tripped can anybody define the possible cause of fault ?

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if we going for high voltage usages what are the considering factors, why those factors are effected.... please give me an answer related motor factors like wnidnig, frame, temp etc

1 Answers   ABB,

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