Power transformer integrity is critical for system reliability as mechanical winding deformations can alter electrical behavior. Sweep Frequency Response Analysis (SFRA) is widely used to detect such alterations; however, fault localization remains challenging due to the terminal nature of conventional measurements. This paper characterizes the distributed electromagnetic behavior of a transformer winding using spatially resolved transfer functions along its axial position. Controlled faults are introduced by modifying inter-disc capacitance, and magnitude and phase data are used to construct three-dimensional representations as a function of frequency and winding position. The proposed framework visualizes how localized perturbations redistribute modal energy within the winding. Selected diagnostic frequencies correspond to spatial electromagnetic modes, providing meaningful features for the classification model. A two-stage Support Vector Machine (SVM) is implemented to localize faults into predefined winding regions using only terminal measurements. The method achieves 94.4% overall classification accuracy. Results demonstrate that conventional SFRA data contain sufficient information for faulty localization when interpreted within a distributed-modal framework.
Sweep Frequency Response Analysis (SFRA) serves as a highly sensitive diagnostic technique for identifying mechanical deformations within power transformer windings. The inherent magnetic and capacitive inter-winding couplings in transformers mean that a fault localized to a single winding can propagate detectable anom...
M. Gojiya, M. Solanki, A. Parmar et al.· ITEGAM- Journal of Engineeri...· 0 citations
Power transformer windings can be damaged by internal faults, such as short-circuit currents and the forces they generate, which can lead to, e.g., internal shorts due to damaged insulation. If these faults are not detected early, they can lead to catastrophic failures. In general, distributed-parameter models can simu...
Amir Ali Kaabi Nejadian, Hamed Moradi Tavasani, Waldemar Ziomek et al.· Electrical Insulation Confer...· 0 citations
The winding structure is a critical component of a power transformer. Assessing its structural condition during operation poses significant challenges for grid maintenance. Unlike static windings, the on-load windings undergo periodic stiffness changes under electromagnetic forces (EMFs). In this study, a novel paramet...
Kaixing Hong, Zichen Zhang, Yichuan Ye et al.· IEEE Transactions on Instrum...· 0 citations
In practical power systems, transformers are continuously involved in voltage conversion and electrical-energy transmission, so once abnormal operating conditions appear inside the equipment, the influence may gradually spread to the stability of the entire grid. Because early-stage transformer faults are usually weak...
Rui Zhu· Applied and Computational En...· 0 citations
Transformer degradation is often accompanied by changes in electrical characteristics. Such changes may originate from insulation defects, winding abnormalities, or local dielectric damage. Detecting these variations at an early stage remains a challenge for condition monitoring. In this work, primary-side and secondar...
Zihao Zhong· Applied and Computational En...· 0 citations
High flux tests are widely employed to diagnose inter-laminar short-circuit faults in generator stator cores. The measurement accuracy and diagnostic reliability primarily depend on the precise assessment of the core flux density via trace windings; however, the physical arrangement of these windings has long been over...
