Washing the insulators of the tensile towers of the OHTL of 500 kV

 


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OVERHEAD TRANSMISSION LINES (OHTL) GROUNDING

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The mechanism of the electric flashover of high voltage insulators

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 Insulator Flashover One of the main reasons for flashover of high voltage insulators is the contamination deposited on the insulator surface These particles are of natural origin or may be generated by pollution that often results from industrial, agricultural or construction activities. When the line insulators are contaminated, many insulator flashes occur during light fog unless the bending rings protect the insulators or special fog-type insulators are used   Changes in channel position of contaminated flashover  The mechanism of the electric flashover of the insulator
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Transposition tower

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  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
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