Outline

  • I. Introduction
  • II. Assessment of Transformer Oil Parameters
  • III. Application of Fuzzy Logic
  • IV. Development of the Oil Indicator
  • V. Case Study

رئوس مطالب

  • چکیده
  • کلیدواژه ها
  • 1.مقدمه
  • 2. ارزیابی پارامترهای روغن ترانسفورماتور
  • 3. کاربرد منطق فازی
  • الف) بررسی کلی منطق فازی
  • ب) تشخیص مبدل با استفاده از منطق فازی
  • 4. توسعه شاخص روغن
  • 5. مطالعه موردی
  • 6. نتیجه گیری

Abstract

Risk assessment for power transformers has long been an effective tool to analyze transformer conditions in order to prevent damage on transformers, extend transformer’s life time and reduce maintenance costs. Various parameters can be evaluated, and decision can be made manually or with the help of mathematical model. A new mathematical risk-assessment model for power transformers is being developed for power system in Latvia, based on specific maintenance features and 4 indicators: dissolved gas analysis; oil analysis, electrical measurements and operation history. This paper specifies oil analysis as one of the indicators of regular risk assessment of power transformers. Development of this indicator is presented based on traditional binary evaluation algorithm combined with fuzzy logic, and as a case study results of oil parameters from different transformers are analyzed and discussed.

Keywords: - -

Conclusions

Survey of the literature allows concluding that each power system has to develop its own individual strategy for power transformer risk assessment and development of risk matrix is a common global practice.

To determine numerical values of the indicator based on oil analysis combined approach of binary and fuzzy logic proved to be successful since it allows evaluating risk based on several oil parameters as a single entity. Results from the case study confirms that higher output value corresponds to the transformers that have already attracted-engineers’ attention.

Further development of the risk assessment methodology continues with the indicator for power transformer electrical measurements.

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