what is diffential relay? testing proceure?and transformer reach Over load thet time differencilal relay operate or not ?

5 Answers  

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What Maximam Gap Taibaar & Bush

0 Answers   Bajaj,

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what is zero sequence curr ent ?

4 Answers  

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how to calculate cable bending angle in a trench?

2 Answers   Eastern Cement,

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r we are using in gas turbine mark (5) frame (6) (made in india Bhel 1997) Ā

0 Answers  

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in the Distribution system .which one is Most Economically used by Power Engineer ? a)3 Phase3 wire System or b) 3Phase -4wire System

6 Answers   APTransco,

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Where do we adjust the setting of thermal over load relay & how cal calulate.

1 Answers   Hilton,

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Differentiate AC and Dc resistance

0 Answers  

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What is system earthing?what are the types?

1 Answers   ABB,

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What is boost transformer in railway??

2 Answers  

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Relation between Sq.mm of wire and Its current carrying capacity?

5 Answers  

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Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

1 Answers  

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