Answer / mahmood ahmed

Earth affects the calculation of capacitance of three-phase
lines as its presence alters the electric field lines.
Usually the height of the conductors placed on transmission
towers is much larger than the spacing between the
conductors. Therefore the effect of earth can be neglected
for capacitance calculations, especially when balanced
steady state operation of the power system is considered.
However for unbalanced operation when the sum of the three
line currents is not zero, the effect of earth needs to be
considered.

Answer / abbas

what is effect of earth on three phase line capacitance?

Answer / rm

FAILURE OF CT PT

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,

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Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core

0 Answers  

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which fault is severe and why?between lll fault and lllg fault which fault is severe and y?

0 Answers   GE,

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In ht capacitor ckt we are using LBS Panel it having isolator with fuse, one of HT fuse flash over, so what is reason behind this event.

0 Answers  

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Transformer type...??

1 Answers  

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what is the difference between star and delta connection?

3 Answers  

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What are the advantages of DOL starter?

7 Answers  

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length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

2 Answers  

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Why transformer is rated in kva?

4 Answers   L&T, NDPC,

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what is preventive maintenance? and what is predictive maintenance? and what diffrence both?

3 Answers   Volkswagen,

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Brief working principle of stabilizer,application & safety precautions

0 Answers  

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why breaker closing coil gets burnt if supply is continously provided to it.

1 Answers   TATA,

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