Answer / mahavir jagdev

The petrochemical industry is susceptible to fire hazards. In DC motors the carbon brushes on the rotor create sparks, which can ignite the petro fumes or vapours. The AC motor speed can be controlled with electronic speed controllers (frequency or voltage type) thus the danger of fire is not there. Even in olden days the coal and other mines which had ignitable gases, had fire proof DC motors and switch gear, which was expensive.

What is basic difference between Soft Starters And VFD drives?

19 Answers   IBM,

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We know that, in case if there is a faulty insulation,or sc, the current is bypassed to earth through the earth wire that has low resistance.Actually, what will happen to that current that flows through gnd?In that case,if we come in contact with that faulty appliance, wont that current flow through us as we form a closed path by standing in gnd?Is grounding a safety measure?

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what is the current limit of lighting arrester ?

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1.what is the reason for transformer and lightning arrester blast in 33kv system

0 Answers   ABB,

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In a HT switchboard where Nos. of Transformers are connected, how to decide Incoming cable size? Whether Cable should be rated for connected load or maximum demand?

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0 Answers  

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HOW TO REDUCE POWER PLANT AUXILIARY POWER CONSUMPTION?

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Which starter can be used for 3 phase verriable speed (2 stator wdg) induction motor ?

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what is the function of potential transformer in s/s

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how the 3phase induction motor is running in 2phase supply with help of capacitor?

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What should do when induction motor take more load in single phase ?

1 Answers  

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