تأثير انحراف الجهد على عمل المحركات الكهربائية التحريضية
Abstract
يتزايد استخدام المعدات والأجهزة الكهربائية ذات المميزات غير الخطية، ومع تعدد واختلاف أنواع المستهلكين التي تتغذى من شبكات توزيع كهربائية معقدة تحوي على كابلات وخطوط هوائية ومحولات – كل ذلك يتسبب في حدوث انحراف في الجهد والتردد وعدم اتزان الجهد والتيار وهذا بدوره يؤدي إلى اضطرابات في نظام التغذية الكهربائية.
لقد تم في بحثنا هذا دراسة تأثير أحد عوامل جودة الطاقة الكهربائية وهو انحراف الجهد على عمل المحركات التحريضية، وكيفية تبدل استهلاك الاستطاعة الردية مع انحراف الجهد سلباً أم إيجاباً. كذلك تم توضيح كيفية تغيير الضياع الفعلي بانحراف الجهد وتأثيره على فترة خدمة هذه المحركات، ذات الانتشار الواسع في كل مجالات الحياة. وإن عدم الأخذ بجدية هذه المشكلة سيكلف الاقتصاد الوطني خسائر كبيرة, وهذا ما تم الإشارة إليه وتوضيحه في البحث.
The use of electrical devices and equipment with nonlinear characteristics is increasing along with the variety and difference of investors.
The equipment is fed by complicated electrical distribution networks containing cables, aerial lines, converters (or transformers) and electric devices. All this causes disturbance in the electrical feeding system resulting from the deflection of voltage frequency and non-stability of both voltage and current.
In this research, we have studied one of the factors of the electrical power quality, which results from the effect of voltage deflection on the inductive motors work and the manner of the reactive capacity consumption change with the deflection of voltage negatively and positively. In addition, the mode of actual loss change has also been explained by the voltage deflection and its effect on the period of the service of inductive motors, which have a wide diffusion in all the fields of life.
If this problem is not taken into account seriously, the national economy will suffer heavy losses. This is the point that has been the subject of discussion.
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