Transient Model of Transformer Winding Multi-conductor Transmission Line with External Distributed Parameter Elements and Its Modular Packaging

The propagation process of the frequency response signal in the substation network must be considered when using the frequency response method to detect the transformer winding deformation on-line. In order to integrate the transformer winding model with the substation network, this paper approximates the discrete difference operation at the model port when building the winding model based on the time domain finite difference method, and proposes a new simplified time Domain finite difference (jianhua, finite-difference, time-domain, JFDTD) algorithm. The algorithm decouples the external network termination characteristics from the multiconductor transmission line model, and can be independently packaged and embedded in the Simulink simulation software, so as to realize the integration of the transformer winding distributed model and the substation network. The error of the JFDTD algorithm can be reduced to about 0.025%, so it has high accuracy. Based on this method, a substation is built to simulate the transient propagation process of the frequency response signal, which verifies its high accuracy and feasibility.