مشخصات مقاله:
عنوان فارسی مقاله:
روشی جدید برای تمایز در خطا داخلی از سایر حالت های گذرا در ترانسفورماتور قدرت با استفاده از تبدیل Clarke و تغییر S هایپربولیک اصلاح شده
عنوان انگلیسی مقاله:
A new method for discrimination of internal fault from other transient states in power transformer using Clarke’s transform and modified hyperbolic S-transform
کلمات کلیدی مقاله:
محافظت دیفرانسیل، تبدیل Stockwell بیش از حد تغییر یافته است، خطا داخلی، اشباع فوق العاده، بیش از حد برانگیختگی
کلمات کلیدی انگلیسی:
Differential protection – Modified hyperbolic Stockwell transform – Internal fault – Ultra-saturation – Over-excitation
مناسب برای رشته های دانشگاهی زیر:
مهندسی برق
مناسب برای گرایش های دانشگاهی زیر:
مهندسی کنترل
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Keywords
1. Introduction
2. Modified Hyperbolic S Transform
3. Proposed method
3.1. Feature extraction
3.2. Classification of different types of faults
4. Results
4.1. Power system simulation
5. Conclusion
Declaration of Competing Interest
Appendix A.
Source
Power transformer
Current transformer
Primary side
Secondary side
References
قسمتی از مقاله انگلیسی:
1. Introduction
Since power transformers transmit large amounts of power in electrical power systems, they are among the most important components in power systems. Almost 10% of power system faults occur in transformers, and 70% of these faults are caused by short circuit in transformer windings [1]. Therefore, faults in transformer are usually considered an important disturbance in transmission networks [2]. The outage rate of a power transformer depends on several factors such as the operating condition of the power transformer, the periodical maintenance, the power transformer’s lifetime and the mal-operation of protection [3]. Abnormal conditions that lead to relay mal-operation include internal faults, inrush currents caused by energizing transformers, external faults, over-excitation and ultra-saturation. Accurately discrimination of internal faults from other conditions has long been recognized as a challenge in power transformer protection [4]. Thus, using a suitable protection system is necessary. One of the important reasons for mal-operation in transformer protection is the magnetizing inrush current that is produced during transformer energizing. The inrush current contains a considerable second harmonic component [5]. Thus, the harmonic restraint method as one of the first methods of recognition of inrush current uses the ratio of differential current second harmonic and fundamental frequency. In Ref. [6], some algorithms based on second harmonic are suggested to distinguish between the inrush current from internal faults. This method is based on the fact that in inrush current conditions, second harmonic content is greater compared to internal fault conditions.