Answer / k.prakashchandra

The iron core of metering CT is smaller compared to that of
protection scheme, for accuracy. Its core reaches magnetic
saturation , if the current exceeds the rated value by a
certain value. After the saturation is reached, the
secondary current wii not incease with the primary
current .

why using in cable mm square which is mm & which is square why using mm & square.

1 Answers   Airtel,

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Can any one provide the inspection procedure of MIMIC for VFD panel? Details: If someone wants to have a mimic in the VFD panel what are inputs considered for the mimic(like on,off,trip) whether we are able to add speed variation in the mimic(if so how can we get) and what are the parameters to be checked in the MIMIC during inspection?

0 Answers  

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Explain the experiment on ward leonard method of speed control of a dc shunt motor.

2 Answers  

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what is the difference b/w permitivity and permeability

1 Answers  

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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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IN Electric train which type of motor is used,for what reason they uses?

3 Answers   L&T,

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What are the commonly used schemes for the bus zone protection?

0 Answers  

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What is pole slipping relay? When it is operated?

2 Answers   Aditya Birla,

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Who are the manufactures those manufacturing 3Cx2.5sqmm FRLS cables. I heard about FRLS technology adopted only in wires useful for wirings

0 Answers  

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what are the C&D CHECK OF DG set

1 Answers   HCL,

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A 200W,230V lamp is connected across 115V supply.The lamp will draw power?

6 Answers   SJVN, TCS,

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Residual voltage & residual current used in which protection?

5 Answers   Qatar Gas, Reliance, Transformers and Electricals,

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