Answer / iamdon

AC generator(alternator) can be designed for higher voltage
as compared to DC generator for following reasons.

Large rated alternators are of rotating field
type.i.e,armature is placed on stator which is stationary
and DC field winding is placed on rotor which is moving at
synchronous speed at steady state.

1)Insulation required for armature, is not subjected to any
mechanical stresss because of no rotation of armature.So
insulation for higher voltage is possible.
2)Armature is placed on stator which is outside.There are
more spaces available on armature.So it is easier to
provide more insulation for higher voltage withstanding
capabilty.

DC generator are of rotating armature type due to which above
mentoined beauty is less effective.So insulation for higher
voltage is not easier.

Author:arbelectbit@yahoo.com

which motor have relatively high power factor and what is reason for have high pf? 1.capacitor run motor 2.shaded pole motor 3.capacitor start motor 4.split phase motor

0 Answers  

---

 where the Motorized mccb to be used? In Motor control center panel starters ,it is use full. please answer  

1 Answers   Voltas,

---

How can get elongation of 2 k.G aluminium, if elongated aluminium dia is 2.5 mm?

0 Answers  

---

What is different between MCB & MCC & isolator switch

1 Answers   Standard Chartered,

---

any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?

0 Answers  

---

can any one help me out by posting something related to rvnl interview for site engineer electrical.? what is the procedure? what kinda question they ask us? how long the interview goes? and any tips? and any thing you want to share?

1 Answers   RVNL,

---

what is a universal motor? how it works?

4 Answers  

---

how to calculate the current if i know power in MW and voltage 11kv/415v and also want to know that incoming cables for trnsformer

6 Answers   Daikin, KOC, Reliance,

---

4-Why we measure the insulation resistance of main core and frame in spite of that must be connected with ground before energize the transformer?

3 Answers  

---

which protection used in power plant?

0 Answers  

---

Is the installation of the filter cloths necessary before spreading the gravels at the transformer yards?

0 Answers  

---

Can we calculate the P.F if we know the only load on alternator .

1 Answers   Medha, Medha Servo,

---