Answer / anil kumar goyal

there is no difference between neutral and earth
in both the cases the potential is zero

WHY TRANSFORMER IS MEASURED IN KVA?

10 Answers  

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why electron not flow in open loop,how they know path is open ?

3 Answers  

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Define branch?

0 Answers  

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What is mean by powerfactor. What is the difference between leading and lagging power factor?

2 Answers   HCL,

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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what is power transformer?

2 Answers  

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how to synchronize 3 phase slip ring induction motors of different ratings.

0 Answers   GMR,

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what do you mean by the "bay" in a switchyard? how to determine exact number of bays in a substation?

8 Answers   Essar, L&T,

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Dear all: Recently we got a question about Interface between PMS and SAP-PM.once we got a update message from PMS.we should set the deletional flag for functional location in SAP system.Is there any FM or BAPI to use?There are only functional location create and change provided by SAP. Best regards!

0 Answers  

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how to reduce power loss when the tranmission under long distance?

19 Answers  

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what you mean ct ratio? why use 400/5a,200/5a,150/5a ?

1 Answers  

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This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

2 Answers  

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