Answer / omar aziz

There are many things that need consideration while
protecting a motor. Motor faliures mainly occur due to
winding faliure. This could be due to overcurrent ,
overvoltage, etc... Back in the early days people strongly
relied on fuses but now we have motor protection relays
that monitor tempratures , currents , voltages etc.. ex GE
MULTILIN MOTOR PROTECTION RELAY

Answer / kalolia alap r

depend on the kind of current,i.e both a.c and d.c required
protection.. motor required starters,like basic D.O.L etc.
in small motor we do not required armature resistance but in
large size of motor,we required large armature
resistance..basicaly required component is resistence in
megaohms and some times induction regulator like auto
transformers....

what is d main difference between KVA and KWA

2 Answers   Charoen Pokphand,

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what is the voltage between nutral and earth?

2 Answers  

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why EMF IS INDUCED IN A CONDUCTOR WHEN FLUX LINKING WITH IT CHANGES ACCORDING TO FARADAYS LAW.

0 Answers   Sail,

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I have connected 04nos. earthings to a transformer through 04nos. earthing pits seperately. 02nos. earthings are connected to T/F body, and 02nos. earthings are connected to T/F neutral.T/F capacity is 2000KVA, 11KV/415V. But after completing of 02 years successful operation ,we are facing following problems- 1. CT/PT occured blast one time 2. HT cable box occured blast two times 3. One body earthing strip and one neutral earthing strip of transformer are overlapping at some places. Whenever these two strips are pressed at overlapped points, they made spark. What is the reason of spark? Please explain the reason & rectification of above problems

5 Answers  

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why in the three pin plug all 3 pins are cutted ?

0 Answers  

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What is the formula to calculate a three phase alternator

0 Answers  

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what is inrush current in transformer?

17 Answers   Bhel, Essar, GMR,

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what reactive how to maintain

0 Answers  

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A transformer has negative voltage regulation when its load PF is A zero B unity C lagging D leading

1 Answers  

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why resistive load has unity power factor,inductive load lagging and capacitive load leading power factor?

3 Answers   OEG,

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what is diffrence between neutral and earth wire

23 Answers   Bhel, Esab, MTNL,

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dear all, can any body explain that how to select an induction motor for a specific mechanical load(inertia). is there any formula or calculation then please give me. i shell be very thankful to all of you. Thank,s and Rgard,s.

1 Answers  

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