Answer / ramu

surge arrest is nothing but passing surge currents to
ground to protect electric equipment

Answer / d.sanadi.

During switching, especially capacitor banks, there will be
voltage surges at the system, to help protect the feeding
equipment from damage, surge arrestors are connected at
supply end and other end is grounded to bypass any peaks as
specified by the rating of surge diverters.

Answer / sudharvino

it is not surge currents to ground its the over currents or
over voltage upon the limits specified,,,,,,,,

Answer / vamsi

during lightening very high voltage passes through the tallest surfaces above ground level,buildings etc ,so in order to protect the appliances ,from damage, a surge arester is placed,it is nothing but a small rod placed on the peak of building ,when heavy currents flow through the aresters they flow the currents to earth,

what type of oil is used in transformers? a)conduting b) insulating

25 Answers   ABB, LGS,

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How much allowable difference current between on three phases Dear sir, We have a 1870 KW HT motor, 11 Kv supply,FLA-120A,2870 rpm,2-pole squirrel cage induction Motor.And stator is connected in star connection with Liquid resistance stater to limit the starting current.It has coupled with Centrifugal air compressor.My question is it is loading 73% of FLA taking R-phase 86.7 A, Y-phase-85.4A,B-phase- 78.3A.why the B phase current is that much of difference.Is it allowable, or any one tell me how much allowable current.If any method to calculate.

1 Answers  

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Current Transformer's star point must face the protected object for the relay operation?

2 Answers   Siemens,

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Why we oil in tranformer/

5 Answers  

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How many double suspension hardware fittings are required on a double circuit transmission tower?

0 Answers  

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What are the Application of CT & PT ?

2 Answers  

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We have given to 3phase supply to ups system & how can coming netural

0 Answers  

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1KVA transformer of different frequencies of 50hz,100hz,500hz&1000hz. which one of these transformer has big size? Give reason

16 Answers   Ecil, Engineers India, MahaDiscom,

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what are the deffects for failure of PLC?

0 Answers  

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what is fuction static switch in ups and tell me use parts name and fucion

3 Answers   Dalkia,

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who is make controlling in the reactive power that genarted in AS genrator(the exitaion currnt or exitation voltge)

2 Answers  

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What is the similarity and what is the difference between relays and PLC?

3 Answers   NTPC,

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