Fuzzy logic-based relaying for large power transformer protection
- Resource Type
- Periodical
- Authors
- Myong-Chul Shin; Chul-Won Park; Jong-Hyung Kim
- Source
- IEEE Transactions on Power Delivery IEEE Trans. Power Delivery Power Delivery, IEEE Transactions on. 18(3):718-724 Jul, 2003
- Subject
- Power, Energy and Industry Applications
Fuzzy logic
Protective relaying
Power transformers
Power system harmonics
Relays
Power system relaying
Power system protection
Surge protection
Frequency
Power system faults
- Language
- ISSN
- 0885-8977
1937-4208
Power transformer protective relay should block the tripping during magnetizing inrush and rapidly operate the tripping during internal faults. The frequency environment of power system has been made more complicated and the quantity of 2nd frequency component in inrush state has been decreased because of the improvement of core steel. Then, traditional approaches will likely be maloperated in the case of magnetizing inrush with low second harmonic component and internal faults with high second harmonic component. This paper proposes a new relaying algorithm to enhance the fault detection sensitivities of conventional techniques by using a fuzzy logic approach. The proposed fuzzy-based relaying algorithm consists of flux-differential current derivative curve, harmonic restraint, and percentage differential characteristic curve. The proposed relaying was tested with relaying signals obtained from Salford EMTP simulation package and showed a fast and accurate trip operation.