بکارگیری محدودساز جریان خطا برای کاهش زمان عملکرد رله‌ها

نوع مقاله: مقاله برق

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی، دانشگاه شهید چمران اهواز

2 استادیار، گروه برق، دانشکده فنی و مهندسی، دانشگاه زابل

3 دانشجوی کارشناسی ارشد، گروه برق، دانشکده فنی و مهندسی، دانشگاه زابل

چکیده

در شبکه های توزیع با جابه‌جا شدن در سطح شبکه جریان خطا تغییر قابل ملاحظه ای نمی کند و لذا، بهره گیری از رله های اضافه جریان کاهشی در سیستم توزیع چندان کارایی نخواهد داشت. زیرا، اگر در شبکه ای تعداد رله های اصلی و پشتیبان زیاد باشد، سیستم حفاظت با مساله ی انباشتگی زمان عملکرد در رله های بالا دست روبه رو خواهد شد. در این مقاله به نحوه رفع این مشکل با بهره گیری از محدودساز جریان خطا (FCL) در طول فیدر پرداخته شده است و از این نکته استفاده شده است که اگر همزمان با کاهش ضریب تنظیم زمانی (TSM) رله ای، جریان خطای عبوری از آن تغییری نکند، زمان عملکرد رله کاهش خواهد یافت. با توجه به تاثیری که مکان و اندازه ی FCL بر زمان عملکرد رله‌ها دارد، سناریوهای متفاوتی در پیدا کردن مکان و اندازه ی مناسب برای FCL در شبکه بررسی شده است. نتایج شبیه سازی ها در نرم افزار DigSilent به کمک برنامه نویسی DPL کاهش قابل ملاحظه زمان عملکرد رله ها را در صورت انتخاب مناسب مکان و اندازه ی FCL نشان می دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The use of fault current limiter to reduce the operating time of relays

نویسندگان [English]

  • Ehsan Khoob 1
  • Mahdi Ghazizadeh-Ahsaee 2
  • Mehrdad Zandi Dare Gharibi 3
1 ahvaz
2 zabol university
3 zabol university
چکیده [English]

In distribution network with displacement at network level, the fault current does not significantly change and it is not possible to effectively utilize the inverse time over-current relays, since, if the number of primary and backup relays increases, we are faced with problem of time accumulation in the operating of upstream relays. In this paper, using fault current limiter (FCL) along feeder, the problem of the time accumulation has been solved. This is done considering that by reducing the Time Setting Multiplier (TSM) of a relay (while the fault current is not changed), the operating time of the relay is reduced. According to the impact of the location and size of the FCL on the operating time of relays, different scenarios have been studied to find the suitable location and size of FCL. The simulation results show that if the right location and size of FCL are selected, large reduction in operating time of the relays will occur. Simulations have been done in Digsilent software and with its DPL programming.

کلیدواژه‌ها [English]

  • Inverse time over-current relays
  • time accumulation
  • fault current limiter
  • Digsilent software
 

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