Answer / guest

UPS under working(ON) state called online UPS,,,,,,,,,,vice
versa

how braking & making capacity of circuit breaker is calculated?

0 Answers  

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11 kv metering is done in my factory.Meter show PF 1.000 but kvarh lag&lead show 24&94 respectively & Avg.PF is .956 .? is what i do for inproove my PF to 1.000

3 Answers  

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i am getting to neutral earth voltage zero ,is this a perfect earthing ?

3 Answers  

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Which motor runs on both ac and ac? a) dc series motor b) reluctance motor

2 Answers  

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What happens if ac is applied to dc systems and vice versa?

5 Answers  

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what is formula in determining the size of Circuit Breaker for transformer with the following specifications. 7 units of 1600 volts (primary) and 400 volts (secondary). Both Primary and Secondary will have a circuit breaker which is SF6. What should be the Switchgear Main Breaker Size anf the sizes of each brances Circuit Breaker for Primary.

1 Answers   ABB,

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Why are the laminations insulated from each other?

0 Answers  

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selection of conductor in different voltage?

1 Answers   TATA,

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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

0 Answers   Siemens,

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in three phase 11kv transformer (11kv/433v) input( R,Y,B) output (X,Y,Z,N) the connection as follows 1 phase R -open 2phase y connected to both R and y of input] 3phase B- B what is the output voltage X to N ,Y to N , Z to N

2 Answers   Bescom,

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What is gain margin?

0 Answers  

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What is potientiometer.What is the use of it.

1 Answers  

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