Transposition tower

 

Transposition tower


In electrical power transmission, a transposition tower is a transmission tower that changes the relative physical positions of the conductors of a transmission line in a Polyphase system.

A transposition tower allows these sections to be connected together, while maintaining adequate clearance for the conductors.

To maintain balanced conditions of reactance and capacitance on the three phases of a transmission line, at least one transposition barrel should be placed between major terminals. However, it has been determined that for less than 161 km (100 mi) between terminals, the unbalance is not sufficient to affect the operation of the transmission line or the protective relays.

 

     وهي مصممه بترتيب خاص يسمح بتبادل مواقع الموصلات الطورية على الابراج تعود الحاجة إلى تبديل مواقع الموصلات إلى أن قيمه كل من محاثه وسعه الخط الطورية غير متساوية على الأطوار الثلاثة نظرا لعدم التماثل الهندسي بين مواقع تلك الموصلات على الحامل، الأمر الذي يؤدى إلى عدم تماثل الأداء الكهربي لخط  النقل ثلاثي الأطوار. ويمكن على تلك المشكلة عن طريق التبديل لمواقع الموصلات خلال مسار الخط، حيث يتم تبديل المواقع على ابراج خاصة تعرف بأبراج التبادل .

 

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