3상 전력용 변압기 보호를 위한 Fuzzy 의사결정 방법 = Fuzzy Decision Making Method for 3-Phase Power Transformer Protection

다국어 초록 (Multilingual Abstract)

The two crisp and two fuzzy criteria to distinguish the internal fault from the inrush for the power transformer protection have been identified. They are based on the fundamental of terminal voltage, the fundamental and second harmonic components of differential current. A systemetic way to determine the associated fuzzy membership function is also proposed. MDS(Modified Dempster-Shafer's rule of combination us used for the inference method to decide the state of a transformer. The proposed algorithm immunes to the disturbances.

목차 (Table of Contents)

• 1.서론
• 2.변압기 과도 현상 모의
• 2.1 변압기 선형 모델링
• 2.2 변압기 포화 모델링
• 3.변압기 모의 분석
• 3.1 전압 데이터 결과 분석
• 3.2 전류 데이터의 결과 분석
• 4.변압기 외란 판단 RuleBase
• 4.1 Crisp Rule
• 4.2 Fuzzy Rule
• 5.Fuzzy Membership 함수와 Bpa 산출 방법
• 5.1 Fuzzy Membership 함수
• 5.2 Bpa 산출 방법
• 6.Fuzzy Inference[5]
• 7.Flow Chart
• 8.사례연구