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‫ﺃﺧﻲ ﺍﻟﻔﺎﺿﻞ ‪ ،‬ﻣﺸﻜﻠﺔ ﺍﶈﺮﻛﺎﺕ ﰱ ﺍﳊﻴﺎﺓ ﺍﻟﻌﻤﻠﻴﺔ ﻫﻰ ﺗﻴﺎﺭ ﺍﻟﺒﺪﺃ ) ‪Starting‬‬ ‫‪ ، ( Current‬ﻓﻬﻮ ﻳﺼﻞ ﺍﱃ ‪ ٧‬ﺃﺿﻌﺎﻑ ﺍﻟﺘﻴﺎﺭ ﺍﻟﻌﺎﺩﻱ‬ ‫ﻭﻛﻠﻤﺎ ﺯﺍﺩﺕ ﻗﺪﺭﺓ ﺍﶈﺮﻙ ﻛﻠﻤﺎ ﻛﺎﻧﺖ ﻣﺸﻜﻠﺔ ﺗﻴﺎﺭ ﺍﻟﺒﺪﺃ ﺃﻛﱪ ‪ ،‬ﻷﻧﻪ ﺗﻴﺎﺭ ﻋﺎﱄ ﺟﺪﺍ‬ ‫ﳑﻜﻦ ﻣﻊ ﺗﻜﺮﺍﺭ ﻋﻤﻠﻴﺎﺕ ﺍﻟﺒﺪﺃ ﻳﺴﺒﺐ ﺷﺮﺍﺭﺓ ﻛﻬﺮﺑﺎﺋﻴﺔ ﻛﺎﻓﻴﺔ ﻷﻧﺼﻬﺎﺭ ﻧﻘﻂ ﺗﻼﻣﺲ‬ ‫ﺍﻟﻜﻮﻧﺘﺎﻛﺘﻮﺭﺍﺕ ﻭﻫﺬﻩ ﻫﻰ ﺍﳌﺸﻜﻠﺔ ‪٠٠٠٠٠‬‬ ‫ﻭﻟﺬﻟﻚ ﻫﻨﺎﻙ ﻃﺮﻕ ﻋﺪﻳﺪﺓ ﻟﺒﺪﺃ ﺍﶈﺮﻛﺎﺕ ﻣﻨﻬﺎ ﺃﻥ ﻳﺒﺪﺃ ﺍﶈﺮﻙ ﺃﺳﺘﺎﺭ ﰒ ﻳﺘﺤﻮﻝ ﺩﻟﺘﺎ ﺑﻌﺪ‬ ‫‪ ٥‬ﺛﻮﺍﱐ ﻭﺗﻌﺮﻑ ﺑﻄﺮﻳﻘﺔ ﺍﺳﺘﺎﺭ ﺩﻟﺘﺎ‬

‫ﻭﳌﺎﺫﺍ ﺍﺳﺘﺎﺭ ﰒ ﺩﻟﺘﺎ ؟‬ ‫ﺍﶈﺮﻙ ﻣﺼﻤﻢ ﻋﻠﻰ ﺍﻧﻪ ﻳﻌﻤﻞ ﺩﻟﺘﺎ ﻋﻠﻰ ﺟﻬﺪ ‪ ٤١٥‬ﻑ ﻣﺜﻼ ﻛﻞ ﻭﺟﻪ ﻑ ﺍﶈﺮﻙ ﻋﻠﻴﻪ‬ ‫ﺟﻬﺪ ‪ ٤١٥‬ﻑ ‪ ،،‬ﻋﻨﺪ ﺗﻮﺻﻴﻠﻪ ﺍﺳﺘﺎﺭ ﻋﻠﻰ ﻧﻔﺲ ﺍﳉﻬﺪ ‪ ٤١٥‬ﺳﻨﺠﺪ ﺃﻥ ﻛﻞ ﻣﻠﻒ ﻋﻠﻴﻪ‬ ‫ﺟﻬﺪ ‪ /٤١٥‬ﺟﺰﺭ ‪ ٢٤٠ = ٣‬ﻑ ﺗﻘﺮﻳﺒﺎ ﻭﺑﺎﻟﺘﺎﱄ ﺍﻟﺘﻴﺎﺭ ﺳﻮﻑ ﻳﻨﺨﻔﺾ ﺍﱃ ﺍﻟﺜﻠﺚ ﺗﻘﺮﻳﺒﺎ‬ ‫ﻭﻫﻮ ﺩﻩ ﺍﳌﻄﻠﻮﺏ‬

‫ﻫﺬﻩ ﺭﺳﻮﻣﺎﺕ ﺗﻮﺿﻴﺤﻴﺔ ﻟﻠﺘﻮﺻﻴﻞ ﺍﺳﺘﺎﺭ ﻭﺩﻟﺘﺎ ﻭﻃﺮﻳﻘﺔ ﺗﻮﺻﻴﻞ ﺍﺳﺘﺎﺭ ﺩﻟﺘﺎ‬

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: ‫ﻣﻠﺤﻮﻇﺔ‬ ‫ اﻟﻘﺎﻃﻊ‬، ‫ﻛﯿﻔﯿﺔ ﺣﺴﺎب ﻣﻘﻄﻊ اﻟﻜﯿﺒﻞ وﺳﻌﺔ اﻟﻜﻮﻧﺘﺎﻛﺘﻮرات‬ ٠٠٠٠٠٠٠٠٠ ‫ اﻷﻓﺮﻟﻮد‬، ‫اﻟﺮﺋﯿﺴﻲ‬ ‫ ( أﻛﺒﺮ ﻣﻦ اﻟﺘﯿﺎر ﻣﻦ ﺟﮫﺔ‬Line ) ‫ﻻﺣﻆ أن اﻟﺘﯿﺎر ﻣﻦ ﺟﮫﺔ اﻟﺨﻂ‬ : ‫ ﻣﺜﺎل‬،،، ‫اﻟﻤﺤﺮك‬ Motor 75 K.w & 440 v & Specify rating Of cables , Contactors , O.L , Main Breaker ?

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SOLUTION : In ( line Current ) = 75000 / 1.73 x 440 x 0.79 = 124 A Line cable carry 1.25 x 124 =155 A From Table Use cable size 35 mm ( From Line To CM ) MCCB = 1.75 x In=1.75 x 124 =217 A ( 225A Standard ) Motor Side : CM & CD = Delta connection Id = In / 1.73 = 124 / 1.73 = 71.6 A Motor Side ( 6 Wire ) cable carry 1.25 x 71.6 =90 A From Table Use cable size 16 mm ( From Motor To CM &CD) & ( 3 wire ) between 3 contactors Contactors Rating : Ic = 1.15 x I ICM = 1.15 x Id = 1.15 x 71.6 =82 A ( Standard 80 A ) O.L.C = ( 60 – 80 A ) ICD = ICM = 80 A ICS = 1.15 x Is IS = Id / 1.73 = 71.6 / 1.73 = 41.4 A ICS = 1.15 x 41.4 = 47.6 A (Standard 50 A ) .................................................................................. : ‫راﺑﻂ اﻟﻤﻠﻒ ع اﻟﻨﺖ‬ ‫؟‬http://www.4shared.com/file/ozRF2zcz/___.html


: ‫وھﺬا ﺟﺪول ﻳﺴﺎﻋﺪك ﻋﻠﻰ ﺗﺤﺪﻳﺪ اﻟﻜﺎﺑﻼت ﻣﺒﺎﺷﺮة‬ ( XLPE ‫ ﻣﺴﻠﺢ‬/ ‫ ﻓﺎز‬٣ ‫) ﻛﺎﺑﻼت‬

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   

   

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