How to Calculate KA Rating of Main LT Panel

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stand by earth fault protection (51G) for transformer rating 2000 kVA,Dyn11,33/0.400 V. LV NCT ratio and necessary resistor and metrosil values how to calculate

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If we need4× 50mm sq cable but it's not available so we can pull 4×25mm sq 2cables

0 Answers   ABC,

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how do u gauge the size of the cable ?for eg. consider a 300 sqmm L.T Cable.How do u determine the size of the cable seeing it pratically?

0 Answers   Bhel, Jai Balaji, Rashmi Group,

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In our plant we are having 6.6 v motor wih MV drive running frm last two years.udenly at some speed motor getting vey vibrations what is the problem

2 Answers   ITC Infotech,

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If you don’t have coal, salt and copper, then how would you earth your connection temporarily at a camp site.?

1 Answers   Focus,

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In a single phase converter, the no. of SCR conducting during overlap? a.1 b.2 c. 3 d. 4

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Why only mesh earthing is used in G.S.S.?

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Any body can help me in getting LT panel test procedure.

0 Answers   TATA,

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Why we find the sensitivity for the CT's to check?

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What is auto reclose system in Circuit breakers

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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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