Answer / h s sandhu

Since there is oil in the transformer and with the load increasing the temp of oil increases because of more current flowing in HT/Lt windings .We measure the temp of oil with the max limit st as per Is of the transformer.( 90deg above ambient )

Answer / jithendra

 Transformer oil is a medium for Transformer winding to decrease the winding temperature when load increases simultaneously winding temperature increases, so oil is used & also it is insulated oil.

Answer / rutulsoni

in trasformer there is increase in temprature with increase load.we measured temp of transformer to measured insulation resistance of device.it shoud not excedd above 85 C in oil tank and shoud not exceed above 95 C between winding...is this right? pls give me feed back

(1)For 3 No 1500 KVA transformer require on one single bus bar or need to be section through bus coupler means upto 3MVA.(2) 22KV Net work system as ring, How maney I/C required or 0ne I/C and one O/G.(3) What should be rating of VCB for 22 KV line.(4)Electrical/mechanical inter lock, why we need.

0 Answers  

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please send me previose rrb junior engineer qustion papers

0 Answers   RRB,

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PLZ EXPLAIN CORONA,SKIN,BIRD PALE,SPAN,SAG Effects of power cable.

0 Answers  

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what is bus duct and what is differance between bus duct and bus bar

6 Answers  

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where is used dc volage transformer,and what is highest capacity of transformer

2 Answers  

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Why the magneti fields are not passes from southpole to north pole

0 Answers   SGML,

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This is reqd for a 1MW Solar power plant..We have 2DC outputs from the solar panels Connected to 2INVERTOR panels.. Output from invertor is 3ph,280v,500kva,50hz.These are connected to individual ACB.This has to be stepped up to 11KV ,1250KVA SYSTEM.Now can I use (1) one more ACBTO GIVE A COMBINED OUTPUT OF 1000KVA,280V & STEP UP THE OUTPUT BY USING a single two winding 3 ph transformer 11kv/1250kva. or (2)use the two outputs and connect to one three winding transformer of above rating..Pls suggestwith details.

0 Answers  

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what is difference between di electric and insulator?

2 Answers   Greenko,

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What is power factor why we should maintain the power factor unless what will happen

0 Answers  

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Is there any particular formula for sizing the bus bar based on the current rating

1 Answers   Bunt Solar,

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please send me previous year questions of jspl through which i could prepare myself for the test.

0 Answers  

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why do star-delta connection ? why do not connect any circuit direct connection ?

1 Answers   IBM, Sri Biotech,

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