Why Nutral CT rating for Earth Fault Protection of Transformer neutral shall be 20% of Full load Current of Transformer

2 Answers  

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how to reverse the direction of universal motor?

2 Answers   Finolex, JGT, TATA,

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why do we use 25kv supply for traction purpose?

0 Answers   Bhel,

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what is Thermocouple? Type of its.

2 Answers  

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In a panel 2500A ACB is the incoming breaker then what is the size of the bus bar?

1 Answers  

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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

0 Answers   Lupin,

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How can eliminate noise problem inside temperature controller temp. variation due to contactor chattering problem.

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Hi i want to know that in generation station what we are generate either voltage or current

1 Answers  

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Why induction motor is widely used in industry

0 Answers   BARC, Honda,

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what is the unit of current

12 Answers   RRB,

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i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

0 Answers  

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can anyone pls expain me about how can we design a cable tray??suppose if have to draw a 3 nos of 50 sqmm AYFY and 2 nos of 35 SQmm of AYFY cable through the tray..how can we design the tray size?? regards...

3 Answers  

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