| Popis: |
Due to the absence of equipment operation parameters or inaccurate input of basic information, it is impossible to accurately grasp the operation status of transformers, resulting in the current situation of group transformers after fault repair became serious rapidly. This paper proposes a general method of grading management, which is easy for operators to accurately diagnose the operation status of the transformers. By supplementing the basic data such as bad operating conditions and family defects of transformers, screened out the transformers that have experienced more than 70% short-circuit current impulse, and the changing trend of historical test data of both capacitance and reactance is selected as the preferred condition for judging the winding deformation position, and constructed the capacitance-reactance models to equivalent the deformation amount. Through the analysis of historical data of group transformers, the latent danger of non-blackout equipment can be found in advance, and the passive situation of transformer maintenance after long-term faults can be changed. |
