عملکرد کاذب رله دیستانس در خطوط کابلی موازی شبکه فوق توزیع به علت اثر جریان معکوس خطا در راستای جریان بار
محورهای موضوعی : مهندسی برق قدرتفرهاد آقاجانیان صباغ 1 , فرزاد حاجی محمدی 2
1 - واحد مطالعات و تحلیل حوادث، امور دفتر فنی، شرکت اختر برق، اصفهان، ایران
2 - واحد مطالعات و تحلیل حوادث، امور دفتر فنی، شرکت اختر برق، اصفهان، ایران
کلید واژه: عملکرد کاذب رله حفاظت دیستانس, خطوط کابلی موازی, شبکه فوق توزیع, زمین کردن شیلد کابل,
چکیده مقاله :
عملکرد کاذب رله دیستانس در سیستم‌های قدرت الکتریکی ممکن است ناشی از مجموعه‌ای از عوامل مانند، اشکال در سخت افزار یا نرم افزار رله، تنظیمات اشتباه و ... ایجاد گردد. در این مقاله موضوع عملکرد کاذب رله دیستانس در خطوط کابلی موازی شبکه فوق توزیع به دلیل پدیده‌‌ای سیستمی تحت عنوان "اثر جریان معکوس خطا در راستای جریان بار بر روی فاز سالم" از جنبه‌های مختلف مورد مطالعه و بررسی قرار می‌گیرد. نوآوری این مقاله تشخیص این پدیده می‌باشد که می‌تواند منجر به عملکرد کاذب رله دیستانس در یکی از فازهای سالم مربوط به خط سالم مجاور و در نتیجه قطع خط مذکور گردد. این در حالی است که خطا تنها بر روی یکی از دو خط کابلی موازی ایجاد شده و بایستی فقط همان خط معیوب از شبکه جدا شود. در این مقاله ابتدا این پدیده به طور کامل توضیح داده شده و اثر آن بر روی فازهای سالم خطوط موازی مجاور نشان داده می‌شود. سپس به منظور بررسی صحت پدیده مذکور، یک شبکه قدرت الکتریکی واقعی به کمک نرم‌افزار DIgSILENT مورد تجزیه و تحلیل و شبیه سازی قرار گرفته است. همچنین عواملی که باعث تشدید و یا تضعیف این پدیده می‌شوند مورد بحث و بررسی قرار می‌گیرد. در پایان راه حل‌هایی برای کاهش اثرات این پدیده جهت جلوگیری از عملکرد کاذب رله دیستانس ارائه خواهد شد.
Mal-operation of distance relays in electric power systems can be caused by a variety of factors, including errors in the relay's hardware or software, incorrect settings, and so on. In this paper, the issue malfunction of distance relay in parallel cable lines of sub-transmission network due to a systemic phenomenon titled "reverse fault current effect in the direction of load flow on the healthy phase" is studied and explored from various aspects. The innovation presented in this article is the detection of described above phenomenon that may cause the distance relay maloperation on a healthy phase of the adjacent line, leading to disconnection of the mentioned line. This is despite the fact that the fault has occurred on only one of the two parallel cable lines, and only that faulted line should be isolated from the network. In this study, we initially provide a comprehensive explanation of this phenomenon and illustrate its impact on the healthy phases of nearby parallel lines. Subsequently, to confirm the occurrence of this phenomenon, a real electrical power network is examined and modeled through DIgSILENT software simulations. Furthermore, we explore and analyze the factors that amplify or mitigate this phenomenon. Concluding the paper, we propose several strategies to mitigate the effects of this phenomenon, thereby preventing the mal-operation of the distance relay.
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