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Circuit Breaker PI Test

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    Circuit Breaker PI Test

    Hi guys,
    I hope you all okay. I just wanted to ask do you have any excel sheet to use in Primary Injection test to see the Long time, short time values? If you have i would be glad if you share.
    Stay safe.

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    Quote Originally Posted by changeabilities View Post
    Hi guys,
    I hope you all okay. I just wanted to ask do you have any excel sheet to use in Primary Injection test to see the Long time, short time values? If you have i would be glad if you share.
    Stay safe.
    These values will be dependent on the specific type of trip unit you are testing but as a general reference I would recommend downloading the Utility Relay AC Pro Instruction Book for generic equations. I've included screenshots of the LT and ST formula along with a link to the original manual below, check out page 20.

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    http://www.utilityrelay.com/PDFs/Pro...ion_Manual.pdf

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    Quote Originally Posted by SecondGen View Post
    These values will be dependent on the specific type of trip unit you are testing but as a general reference I would recommend downloading the Utility Relay AC Pro Instruction Book for generic equations. I've included screenshots of the LT and ST formula along with a link to the original manual below, check out page 20.

    Click image for larger version. 

Name:	ac-pro-lt-st-formulas.png 
Views:	0 
Size:	158.1 KB 
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    http://www.utilityrelay.com/PDFs/Pro...ion_Manual.pdf
    Thank you so much for your response.

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    Quote Originally Posted by changeabilities View Post
    Thank you so much for your response.
    No problem, I'd also recommend checking out the table on page 18 it will give you some expected trip times for the LT function along with allowable tolerance for various bands and test currents. Again, this may be different depending on the specific trip unit but it gives you a general idea.

    Click image for larger version. 

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