Answer / balram raturi

ciruit breaker operates on load but isolaters are operated
on no load or to isolate the healthy system.

Answer / ammajirao

The circuit breaker can operate in both ON load and OFF load
because quenching medium is available to extinguish the arc
but in case of isolator, it should operate in OFF load
only because of no quenching medium.

Answer / koli60

c.b is protective equipment which is used to
protect tran. line in abnormal condition. we can operate
c.b. manualy as well as automaticaly .
while isolater is also protective equipment . but
isolater cant be operated automatically .
in normal condition isolater contacts are closed .
but c.b. is opened ........

Answer / ankit

In the simplest form:

An ISOLATOR is a manual circuit breaker while Circuit
Breaker does this with the help of a relay.

Regarding the arc quenching medium, isolator too have air
as arc quenching medium.

And,

An iso. is an off-load device but a CB is onload.

we have one ups its neutral is not earthed.its one distribution MCB has a earth fault.but we can not put off any MCB.so how to find out that in which circuit is earthed without isolating the breaker.

3 Answers   CFCL,

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what is Use of Stones/Gravel in electrical Switch Yard??

4 Answers   Sanghi,

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we are having 15kw and 3kw motor both can run in same time , instead of using copper we are using ug aluminium cable , 35 sq.mm is suitable for its current carrying capacity..?

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what is megar testing

4 Answers   NASA,

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What happen to alternator if prime mover fails?

4 Answers  

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i karmveer bharti persuing b.tech . plz send me syllabus and name of reference books. for preparation of section eng.

0 Answers  

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what is the rating of power generation in india?

10 Answers   Siemens,

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Based on CPI/CGPA they shortlist the candidates & than directly start Interview so there is no Written Exam or GD Only PI.Interview held @ MNNIT , ALLAHABAD On-Campus on 6th,Aug, 2007 & the Questions asked to me by Interview Board ( 4 People) are from HR/SummerTraining/BTP/Subject-core, POWER SYSTEM & MACHINE. time duration of I/V is about 15-20 Minutes. HR- Q.1 Name,hobbies & About family background ? Q2.What u know abt NTPC ?? Q3.Why u want to choose NTPC as ur Carrier's starting i.e power sector not any other Oragnisation or sector ?? Techincal Questions- Q1.What is the reason for transformer Noise ?? Q2.Which material is used for making Transformer oil & How u measure its dielectric strength & Name the test ? Q.3 Which Machine u will prefer 2 use if flammble gases are coming out at a place & why ?? Q4.What is relation b/w Transmission Lines & Communication Lines ? Q5.What is the maximum capacity Synchronus Machine & total powerGeneration in our country ? Q.6 In india Power generation is at 50Hz while in America its 60 hz ,why so ?? Advantage or disadvantage ?? Q.7 Maximum Generation Voltage in india ? Q8. What is the Voltage regulation & why its required n how much is permissible ? & causes of voltage variation ?? Q.9 Why electric shock is feel ?? n in a Electric Train why we didnt feel that ? Q.10 Have u seen/ experience of any power plant/ industry related to the power sector ? so these are the questions which not too diffcult i think was asked to me.

6 Answers   NTPC,

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Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.

15 Answers   ABC, Kirloskar, Sify,

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In A.C systems, fuse is placed in phase-in order to disconnect the circuit during faulty condition. But, what is the reason for putting "LINK" in neutral istead of connecting through (same) wire.

3 Answers  

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What is time invariant system?

0 Answers  

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Why can't we take NO LOAD TRIAL of motors having V1 mounting??

0 Answers  

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