What are protections for dty type transformers

0 Answers  

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why we get 2 differnet values for power factor in 2 watt meter method in 3 phase

0 Answers  

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How to run 1ph motor(230 VOLTS its full load amps is 4.5 ampa))with 480 volts main(we didn hav neutral)Thn we go for step down transformer.Our load 10 amps,so we conisder this amps in primary are secondary side?

1 Answers  

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hi.. i am krishna. i've complide my diploma engg.in electrical.i applied many places for jobs.but i am always fear from written test.ican't get success in it. i think my basic engg. is weak..show me some idea please..!

5 Answers  

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why we are having many type of vector group in the transformer ,what is the use of it?

2 Answers  

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When distance between two pulleys is not fixed, the tension of belt is adjusted by a) driver shaft b) driven shaft c) adjustment screw d) belt

0 Answers   BMRCL,

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what is ICU and ICS in breaker ratings

1 Answers   QAFCO,

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if we convert kva into Ampers,which one formula use by us,pls tell me?

7 Answers   ABB,

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How will calculate the current rating (withstanding capacity)of alumunium and copper cables?

1 Answers  

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Why voltge arev transformed in to 132KV/66/KV/33KV like that

5 Answers   HAL,

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I have 2 Nos of 2500kVA 33/0.415V cast resin transformers. How to decide on ampere rating of HT Panel? Also advise me how many panel RMG i have to consider whether 4 panel ok?

1 Answers  

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Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phase mixed loads. Power room has ammeters connected via CTs for individual phase. Now I know that readings shown on meter for each phase say R,Y and B are line currents. But when I want to know the total on transformer do I need to add the currents of all three phases readings shown on meter or value for anyone phase will give me the correct power load on transformer for that point of time. 2. If ammeter shows unbalanced readings for R,Y, B phases say 150, 250 and 300 respectively so can I assume that 150A i.e average of 3 will be the 3phase load currents and remaining will be 1phase currents. Please clarify my doubt.

4 Answers  

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