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MCCB KA selection

Created by: PISCEAN 2010 at: 11/19/2010 5:26 AM (27 Replies)

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6/2/2012 11:41 AM
darkknife Posts: 12 Rating: (0)	Good Day, On how to determine the interrupting capacity of the breaker you should cumpute the Isc your network...there is a lot of computation needed to know in interrupting capacity(KAIC). here is the attached file hope that can help you...if you have question and feedback im open to help....
darkknife Posts: 12 Rating: (0)
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6/2/2012 2:35 PM	Rate (0)
darkknife Posts: 12 Rating: (0)	Good Day, On how to determine the interrupting capacity of the breaker you should cumpute the Isc your network...there is a lot of computation needed to know in interrupting capacity(KAIC). here is the attached file hope that can help you...if you have question and feedback im open to help.... Attachment Calculation of short-circuit currents.pdf (629 Downloads)
darkknife Posts: 12 Rating: (0)
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This contribution was helpful to 5 thankful Users Vithani PISCEAN 2010 zzVss Jason85 Sasongko

6/29/2013 1:52 PM	Rate (1)
DILIP_1111 Posts: 43 Rating: (9)	Dear Deep, 25KA or 50KA is s/c withstand capacity of MCCB whatever you will select, this is only depends on your LT transformers fault level, i.e. after clearing upto 25KA or 50KA fault level, your MCCB is still capable for further service.
DILIP_1111 Posts: 43 Rating: (9)
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7/1/2013 12:34 PM	Rate (0)
@nkur Posts: 202 Rating: (16)	Hi there when you move down through the SLD i.e from incomer to various feeder the fault level also decreases hence now yhe fault level depend on the busbar on the incomer(ACB) that is been selected.
@nkur Posts: 202 Rating: (16)
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7/2/2013 7:25 AM	Rate (0)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 8/5/2024 Posts: 1976 Rating: (477)	Hello Deep I was searching from google and found some nice explanation http://mandrelectrical.com.au/karatings.php http://www.electrical-installation.org/enwiki/Selection_of_a_circuit-breaker I think, this will guide you further Hope this will help you Best Regards, Devesh Vithani
	I dont Like people driving Fast, thats the reason I overtake them ;)
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This contribution was helpful to 4 thankful Users PISCEAN 2010 KaRthiNya @nkur zzVss

7/2/2013 7:46 AM	Rate (0)
Valli Posts: 262 Rating: (45)	Hi, In Siemens, we recommend to use the best way of calculating Fault level and that is SIMARIS Software... please refer the below link and download it freely and use extensively... https://www.automation.siemens.com/mcms/electrical-design-software/en/service-support/simaris-software/Pages/default.aspx
Valli Posts: 262 Rating: (45)
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This contribution was helpful to 1 thankful Users PISCEAN 2010

7/17/2013 1:48 PM	Rate (0)
@nkur Posts: 202 Rating: (16)	Hi There Can any tell me how the Fault level for transformer is decided as from that fault level the PCC & MCC panel are designed ???
@nkur Posts: 202 Rating: (16)
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7/17/2013 1:58 PM	Rate (0)
PISCEAN 2010 Diamond Member Joined: 4/23/2010 Last visit: 12/31/2023 Posts: 8092 Rating: (878)	Hello, Transformer s/c capacity is fixed & depends upon voltages, & impedence of transformer & does not depend upon MCC or PCC panel. Designer has to select protective devices in MCC & PCC panel depending upon s/c level of bus, or system

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