Answer Posted / krishnappan

in switchyard first our earth switch should be open.
after that close the bus isolator,then line isolator.
finally close the circuit breaker

What is the emf equation of a transformer?

669

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How to see the inductance in a transmission lines

1669

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What is Long rod insulator and it's applications..? merits over the disc insulator ..?

1436

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what is the maximim current drawn by 1 phase and three phase welding machine

1447

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which is chemical used as in ro water what is difference betweeen multi grade filter&dual media filter

1634

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Its possible to use 3core 2R of 240 sq.mm cable for 3phases & separely 50sq.mm 3core cable fully for Neutral for connection of PCC to MCC 3ph..4wire system?

1685

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what purose of the double circuit transmission line phase of the line phase changed for circuit-1 for Circuit-2 R-Y-B B-Y-R

1818

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Can you tell me more about pu systems (per unit systems )calculation in large power systems? how to get the base for voltage and power in generator, transformator and transmission lines?

1803

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1.why are not using acb 33kv ht side? is there any problem 2.what is difference between acb,vcb,sf6 breackers? 3.what is the function of invertor and convertor in ups?

1687

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What is the difference between diode and a transistor in terms of the direction of current flow?

1681

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what is feeder bay?

1112

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is there any device that works properly accept relay, it may be fuse but if i want fuse of 33kv 300 amp it is avaliable, pls give me details

1569

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What is quadrantal symmetry?

1104

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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?

1776

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why we need to us lenz's law for synchornous motor

2070

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