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The Frequency and Transient Analyses of a High Voltage Bushing/Transformer Cascade
Abstract
This paper investigates the frequency characteristics and electromagnetic transients of a typical system composed of a high voltage bushing and a power transformer connected in cascade. Detailed distributed-parameter Laplace-domain models are adopted for the digital simulations. These parameters include, among others, the transformer winding’s series inductance, its capacitance to ground and the inter-turn capacitances. Moreover, the number, the geometrical data of the capacitively-graded bushing’s conducting foils and the dielectric insulating layers are also taken into account. The results of several case studies indicate that the consideration of the bushing’s parameters will impact the cascade’s frequency characteristics and its time response. On the other hand, the presence of the transformer winding and the treatment of its neutral point will affect the voltage and current spatial and temporal distributions within the bushing.
Keywords: GIS, gas-insulated switchgear, capacitively graded bushings, parametric functions, differential equations, numerical Laplace inversion, transformers, bushing, equivalent circuit, electromagnetic transients, distributed parameters, frequency response, time response, resonance
Cite this Article
Saied Mohamed M. The Frequency and Transient Analyses of a High Voltage Bushing/Transformer Cascade. Journal of Power Electronics & Power Systems. 2019; 9(1): 42–53p.
References
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DOI: https://doi.org/10.37591/.v9i1.1102
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