Answer / tariq

DC Series motor has high starting torque. We can not start
the Induction motor and Synchronous motors on load, but can
not start the DC series motor without load....

Answer / khursid allam khan

DC series motor has high starting torque..but it is not that
we cant start it without load,it is that we dont start it
without load beacuse its high speed will severly damage the
motor and may harm its sorrounding by breaking the parts..it
is very high speed..thats why it is used in traction where
high load is given to it

Answer / wayne king

SERIERS-WOUND

Answer / felixraj

IM > SM

Answer / dipak roy

It seems from the information available in the intenet that I have invented AC 3-phase squirrel cage Induction motor which has highest Starting Torque at its rated capacity, which may be from less than 1 KW to more than 1000 Kw. A prototype motor 1450 rpm of 7.5 Kw rated capacity has been tested on Test Bench to find that when such a motor is tested with Load Vs Speed graph produces 6.1 Kg.Mtr torque at 1200 rpm or 20% slip and average phase curren being 9.2 amp.,Under Locked Rotor Condition, 0 rpm, torque developed being 3.8 Kg.mtr, the average phase curren was 30.1 amp. But when the prototype motor was tested on the bench under Locked Rotor Condition (LRC) it produced torque of 7.3 Kg.mtr, average phase current being 27.8 amp. and at 1200 rpm it produced 3.1 Kg.mtr torque with average phase current of 9.4 amp. So AC 3-phase squirrel cage induction motor can very well be started with full load along with reduced Stator current or electrical consumption by about 8%. The prptotype was made and was being tested for development of 1000 hp traction motor for the locomotives of the Indian Railways

how to find out cable size if load is 2800 watts, 230 volts AC supply and load distance is 1800 meters

0 Answers  

what is the concept of directional power?

0 Answers  

What are the different pre-commissioning tests that are performed on the distribution transformer, power cable and switchgear (11kv)?

1 Answers   Hitech, Reliance,

Please clarify, 1. Is it required to lay two runs of GI wire along with Armoured LT cable if it is laid between one big mains (63Amps TPN SDF) to small main (32A TPN SDF) with proper glanding termination? 2. If the armoured cable with proper glanding is laid from DB to CNC machine, is it required to run two runs of body earthing to the Machine from DB? 3.If the armoured cable with proper glanding is laid from Substation to Hangar, distance is approx. 100 mtrs, is it required to do earthing at shop area though the primary termination at substation is earthed through gland.

0 Answers   HAL,

how to calculate differential current when we testing differential relay..suppose we have 1000kw generator,630amp VCB,what value we should put /inject so that relay trip the VCB? PLLZ justify ur comment

0 Answers  

which is chemical used as in ro water what is difference betweeen multi grade filter&dual media filter

0 Answers   Dalkia,

how a.c. genarator control power factor when its conected to grid supply by incrising or decresing excitation voltage.

1 Answers  

Can you use step up generator transformer of voltage ratio 16.5kv/420kv in place of step up generator transformer 15.75kv / 420 kv

1 Answers  

how u select control transformer for a mccb panels or any panels?for expample we hav 440 volts maim supply and control volts is 230v?

0 Answers  

how we calculate the 30 KW 3phase electric motor current on noload

23 Answers   Monnet, Siemens, SSR, Supermac Industries,

Hoe to calculate body earthing conductor size ?

1 Answers   IES,

What is grid collapse? what is the reason for it?

0 Answers