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مشخصات کلی کابلها

نویسنده :مرتضی قندی
تاریخ:دوشنبه 8 آبان 1391-11:06 ب.ظ

                    مشخصات کلی کابلها 

ساختمان كابلها:

شناسائی كابلها:

قابلیت تحمل بار كابلها

پلاك خوانی الكترو موتورها:

انواع حفاظتها طبق استاندارد دین 40050

  كابل:

 چند نكته مهم و كوتاه:

 مقاومت: عبارت است از عكس ال عملی كه هر عنصر با توجه به ساختمان اتمی و تعداد الكترون لایه اخر در  مقابل عبور جریان یا حركت الكترونها از خود نشان میدهد  مقاومت با طول هادی نسبت مستقیم و با سطح مقطع نسبت عكس دارد . برای اندازه گیری مقاومت فلزات یك متر از انرا به سطح مقطع یك میلیمتر مربع انتخاب كرده و مقاومت انرا اندازه گیری میكنند (جداول اماده برای همه فلزات وجود دارد) كه به ان مقاومت مخصوص میگویم و برحسب اهم است.

  وقتی میگوییم مقاومت یك فلز با طول ان نسبت مستقیم دارد یعنی هرچه طول بیشتر باشد مقاومت هم بیشتر میشود 

 L1

 و وقتی میگوییم مقاومت با سطح مقطع نسبت عكس دارد یعنی هر چه سطح مقطع بزرگتر باشد مقاومت كمتر است   L1=L2 S1 نتیجه R1

 واحد مقاومت اهم میباشد كه با حرف یونانی امگا نمایش میدهند.

 هدایت الكتریكی عكس مقاومت است هرچه مقاومت بیشتر باشد هدایت كمتر است و واحد ان مو میباشد.

  G=1/R

 مثال: مقاومت یك سیم به طول 100 متر و به سطح مقطع 2 میلیمتر مربع؟

  R=A*L/S

R=0.0175*100/2

مقاومت مخصوص =A طول = L سطح مقطع =S مقاومت مخصوص مس =0.0175




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