Answer / rakesh jha

A 3-phase transfomer required it's neutral to be grounded.
In delta-delta connection, neutral is not grounded. we use
small star-delta transformer to connect with delta-delta
transfomer and neutral will be grounded.

Answer / zizo

In cases where the neutral point of three phase system is
not accessible like the system connected to the delta
connected side of a electrical power transformer, an
artificial neutral point may be created with help of a
zigzag connected earthing transformer.

Sir, how to calculate the voltage drop and short circuit current of cable. please give me example and formulas.

1 Answers  

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1,Building containing 25 flats how much Amp 3 pole MCCB are required? 2, For the safey of each flat how many Amp RCCB can install -loaded with A/C

1 Answers   L&T,

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In MEP Services what are parts of STP and what are there function?

0 Answers   Tenon,

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what you mean by transformer neutral earthig

1 Answers   IOCL,

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what is the difference between arc and spark

2 Answers  

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what is the ideal earth resistance

11 Answers   Amit Enterprises, Enercon,

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Why in metering Ct for ammeters ct secondary side is grounded for each Ct but not in case of CBCT (Core balance current transformer)..kindly some1 highlights the reason..is it because net flux is zero?

0 Answers  

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0 Answers   Bhel,

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what is derated current of power cable & what is formule to find derated current?

1 Answers   Thermon,

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When we need start the motor by method of star delta which size (KW or HP)motor should must be operate in Star Delta Method,

3 Answers  

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What are steps to be taken while designing of DYN11 distribution transformer to achieve magnetising balance?

0 Answers  

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why transformer is rated in kva?

2 Answers  

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