Title :
Research on Integration of Transformer Protection and On-line Detecting Winding Deformation Based on Equivalent Circuit Equation
Author :
Zhi-guo, Hag ; Bao-Hui, Zhang ; Peng, Li ; Yun, Chu
Author_Institution :
Dept. of Electr. Eng., Xi´´an Jiaotong Univ., Xi´´an
Abstract :
This paper bring forward new algorithms that integrate on-line detecting winding deformation into transformer, which is based on Equivalent Circuit Equation (ECE) of transformer. Firstly, the protection algorithm based on ECE is presented, and the criterion functions are derived for single-phase and three-phase transformer. The leakage inductance is the key parameter in ECE, which is not available and changes follow winding deformation, the least square is adopted to service as parameter identification. The mathematical models for identification are derived. The dynamic simulation experiment data indicates that on-line identification of transformer winding leakage inductance parameter is not only precise but can effectively detect winding deformation. The protection algorithm is theoretically clear and it can correctly and rapidly recognize the various transformer internal short circuits with distinct features.
Keywords :
transformer protection; transformer windings; equivalent circuit equation; on-line detecting winding deformation; parameter identification; single-phase transformer; three-phase transformer; transformer protection; transformer winding leakage inductance parameter; Circuit simulation; Deformable models; Equations; Equivalent circuits; Inductance; Least squares methods; Mathematical model; Parameter estimation; Phase transformers; Protection; Leakage inductance; equivalent circuit equation; least square; parameter identification; transformer protection; winding deformation;
Conference_Titel :
Power System Technology, 2006. PowerCon 2006. International Conference on
Conference_Location :
Chongqing
Print_ISBN :
1-4244-0110-0
Electronic_ISBN :
1-4244-0111-9
DOI :
10.1109/ICPST.2006.321615