Answer / monika hassan

When the magnetic field through the core changes, the magnetization of the core material changes by expansion and contraction of the tiny magnetic domains it is composed of, due to movement of the domain walls. This is a lossy process, because the domain walls get "snagged" on defects in the crystal structure and then "snap" past them, dissipating energy as heat. This is called hysteresis loss. It can be seen in the graph of the B field versus the H field for the material, which has the form of a closed loop. The amount of energy lost in the material in one cycle of the applied field is proportional to the area inside the hysteresis loop. Hysteresis loss increases with higher frequencies as more cycles are undergone per unit time.

why we are using star connection and delta connection? difference?

5 Answers  

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usually why bettery voltage are 1.5V, even if you open a 9V battery there are six 1.5V batteries in series. is it not possible to increase this voltage other than putting in series

1 Answers  

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how to reduce the initial starting amps which is equal to the running load amps

3 Answers  

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what are feeder pillars & panels?

1 Answers  

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if dc is better then ac...then why we are perfering ac over dc?eg:at home?

2 Answers  

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how can electricity is produced without water

6 Answers   Bescom,

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Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

2 Answers  

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Why transmission line carryiny high voltage and low current?

3 Answers   apspdcl, Universal Power Controls,

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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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which type of amplifiers are used in multimete?

0 Answers   NTPC,

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why can not run two different phase circuit in to the same conduite

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What are the types of the glands and difference between single and double compression type of cable Glands.

0 Answers   ABC, All Trades Electrical,

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