Answer / yusuf

> Opening and Closing Coil Resistance measurement
> Contact Resistance Measurement. (This Ensures minimum
Voltage drop)
> Timing Test(Ensures Fault clearance time)
> IR Measurement(Ensure proper Isolation from Ground and
between Phases)
Other than these, H.V, Flash Test, Tan Delta are also done
in the factory

Answer / manisand1

Above all some more test is to included i will clear this
in next time.

present we are having 0.8pf but I want increase it up to 0.99 so what is the formula for it and how can i calculate?

3 Answers   ABB,

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why HV test for cables?.why 0.7times?

1 Answers   Bosch, Prince Food Products,

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In 110V DC supply,if a closed circuit gets open, How can we identify the voltage which is measured after the resistor(4KOhm) which is open with negative.it shows 55V +ve when measured, also the actual positive source is 55V +ve .Because there is no voltage drop in open circuit. How can we identify whether this is the voltage which is series with the resistor or the DC source direct +ve.

1 Answers   GE,

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how will calculate the safe starting current of 3-phase squirrel cage induction motor?

0 Answers  

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which motor gives constant speed?

7 Answers  

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What are the testing to be done before the installation of 1000 KVA Transformer?

3 Answers   L&T,

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What happen if we give resistance to the armatuure of a dc motor?a

1 Answers  

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why transformer core is eathed?

7 Answers   ECE,

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why does make gain margin and phase margin on same plot.?

0 Answers  

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Battery is a voltage source? give one example of current source and why?

0 Answers   Suzlon,

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AVR

2 Answers  

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What is the difference between phase, neutral wire and earth cable. if neutral is connected to ground, y we need earthing cable? what difference in hot and cold wire? do neutral wire carry current?

1 Answers  

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