Air Circuit Breaker, Current Injection Testing

I am sorry my friend but it would take too long to explain all of the above. I suggest you get some help from an experienced commissioning engineer. On your own you are only likely to make things worse, or dangerous. Do this before switching it on.

I am sure others will echo my sentiments.

You can start by buying a book on electrical principles and work up from there.

The ACB manufacturer may also run courses.

you're scaring me

I'm more concerned about the innocent people of Dubai.

A selection from OP's first visit here: "i have completed bachelors in engineering few months back and i joined this company

I am currently working in the construction of a 33KV/11KV substation.

I do not have cable schedule.

How can I create a cable schedule?"

L & T conducts a training course on Air Circuit Breaker Selection, Testing & Maintenance. Please visit their website: www.lntebg.com. Or contact Mr. Bipulkumar

CR4 Admin - removed phone number

"this forum is not that helpful for beginners

i advise you to go to linkedin.com and join electrical engineer group and ask questions there you find more relevant response"

Read the equipment manuals (Test instrument and Breakers), inquire from qualified personnel doing the job and better let you and him do actual tests. Then, all your questions are answered.

mukultyagi:

You have already said everything that was listed in some catalog which you have already read.
There is current and time graph - which means less current takes longer time
There is a maximum operating current up to which nothing happens
There is catastrophic level instantaneous level highest current which makes breakdown instantaneously (or sure to act in minimum possible action time)
You know all these right from catalog in your hand then what else you want these good fellows to help you?

Are you from DAE or DRDO? There people are never sure of anything.

I agree with the sentiments of the other posters. Suggest its not only the complexity of the tests you need to consider but also the safety aspects you are likely to miss. Would you spot an open ended CT. Would it matter? There is more to injection testing than meets the eye - there is usually a shed load of experience.

Time to walk away from this and instead witness test an expert.

Long time pick up - normal over current - Settings between 0.1 to 1 ( 10% to 100%)

Short time - for starting current of motor etc. this can be set as per your load charecterstics, for example 1.5 times, 2 times etc.

Instantaneous trip - for the short circuit current - can be set to 2 to 10 times to the rated current

Anand

Someone should have already done a protection study on this breaker. It will give you the settings so that cables and equipment are correctly protected. Usually these settings are put into the relay by a competant person who is both familiar with the relay and through experience would also see if a figure was horibly wrong through a typing error. With these values in your hand you could think about testing. I think you should also wonder whether you are suitable skilled to undertake the task and give consideration to the lives you could be putting at risk. Fiddling with these knobs and buttons could be that serious.