Answer / ahmed mustafa

Transformers have errors arising from both Watt metric and
magnetizing current losses that cause deviation from the
ideal and the interconnection between them may have unequal
impedance, this can give rise to spill current through the
relay even if no fault has been detected.

Answer / max

current in relay in no-fault condition

Answer / tahsinullah

The current which flow in the Over-Current-Relay during fault is called Spill current.

Answer / shaikh

The ratio of primary to secondary current and produces the
spill current in relay.

Why synchronous motor runs at a fixed speed? what is the name of that fixed speed?

4 Answers  

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the power consumption of perminant magnet moving coil?

1 Answers  

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In our factory so many iron pillors are exists for supporting the shed/Hangar. If do more no of earthings at one piller instead of doing more earth pits in many locations and running earth strip around the hanger, I can save the money. Please suggest this method is acceptable as per Is specifications though the Earth resitance of the farthest piller is with in the limits as per IS specifications.

1 Answers   HAL,

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I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?

1 Answers   US Electrofused Minerals,

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what is priming pump?why it is used ?

2 Answers  

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why mccb is not tripping when phase & neutral terminal are interched ?

4 Answers  

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WHAT ARE THE FACTORS REQUIRED FOR SELECTION OF TRANSFORMER RATING?

13 Answers   Tech Mahindra, Technip,

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How do we find the rating of a transformer, if it got burnt badly.

1 Answers  

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what is the relation between the size of the machine and the frequency? (when the frequency increases the size of machine will increase,why?)

2 Answers  

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What is I to C?

1 Answers   PowerTech,

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What determines the thermal loading on the motor?

0 Answers  

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How test for Ddo vector group test condition?

1 Answers  

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