while selecting transformers for 33 kva feeder normally we ask for 33/433 kv why not 33/415

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3phase lt motor winding how to checking with megger

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

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in slip ring motor if motor specification is given how we calculate its rotor resistance in starting

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Define coil span?

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What is a Servo Stabliser.

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In EHV transmission line a neutral grounding reactor is often placed at neutral point of shunt reactors. What is the recommended protection for this neutral grounding reactor? Should I use a fast closing switch to bypass neutral grounding reactor when this protection operates?

0 Answers   TATA,

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3phase cable calculation formula by motor load

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Is there thumb rule to calculate how many Insulators to be used for Transmission line of different volatges

3 Answers   CS,

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what is POTT and PUTT explain?

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What about electrical Units. discrive in detail

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What will happen when more than one star neutral points at same voltage level are connected to earth by metallic conductor?

1 Answers   TCS,

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