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6300A Interleaved

The document evaluates the adequacy of a busbar rated for 6300 Amps, detailing its specifications, including temperature rise, enclosure size, and material. It calculates the rated current under site conditions to be 8575 Amps, confirming that the busbar's temperature rise remains within safe limits. The design is deemed safe as the temperature rise does not exceed the specified maximum of 40 ºC over an ambient temperature of 50 ºC.

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priyapri242002
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87 views1 page

6300A Interleaved

The document evaluates the adequacy of a busbar rated for 6300 Amps, detailing its specifications, including temperature rise, enclosure size, and material. It calculates the rated current under site conditions to be 8575 Amps, confirming that the busbar's temperature rise remains within safe limits. The design is deemed safe as the temperature rise does not exceed the specified maximum of 40 ºC over an ambient temperature of 50 ºC.

Uploaded by

priyapri242002
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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1.

ADEQUACY OF BUSBAR FOR RATED CURRENT


DESCRIPTION DATAS

Rating Amps 6300


Max. Temp. Rise of busbar over the ambient of 50 º C Deg C 40

Enclosure Size (W x H ) mm 850 x 500


Enclosure Material AL. 3 mm Tk.
Busbar size & material - Phase 4 Nos. 200 x 10 mm Alu. Flat

Busbar area per phase Sq.mm 8000


Busbar - Phase spacing mm 130

Still air rating of 1 No.200 x x 10 Alu. Flat Amps 2795


Therefore Equivalent Current rating of 1 No. 2795*(200/200)*(10/10)
200 x 10mm alu Flat will be Amps a1 2795
No of busbars a2 4
Current rating for the selected busbar A=a1*a2 11180
Up scale of Busduct (For Interleaved is 18% ) C=A*18% 2012
Total Amps A+C 13192
CORRECTION FACTORS
Temp.rise factor for 40º C rise over 50º C ambient b1 0.840
Enclosure correction b2 0.800
Enclosure material factor b3 1.000
Correction factor for busbars matt black paint b4 1.200
Proximity factor b5 1.000
Total correction factor (b1 x b2 x b3 x b4 x b5) B 0.650

Rated current rating under site condition (in Amps) Amps AxB 8575
Rated Continuous current rating (in Amps) Amps 6300

2. TEMPERATURE RISE

Temperature rise : ( I 1 / I 2 ) = ( T 1 / T 2 ) ^ 0.61


Where
I 1 :- Calculated rating in Amps. 8575
I 2 :- Specified rating in Amps. 6300
T 1 :- Max. temp. rise specified in o C 40
T 2 :- Calculated temp. rise in o C 24

As the busbar temperature is within limits of 40 º C rise over the ambient of 50º C.
Hence our busbar design is safe.
Copper for Busbars - CDA

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