Analysis of the Zero-Missing Phenomenon on Mixed Overhead-Underground Cables in 220 kV Transmission Lines
Main Article Content
Abstract
The paper investigates the dynamic behavior of a 220 kV mixed overhead-underground transmission line compensated with a shunt reactor, with a focus on the current zero-missing phenomenon and switching overvoltages. The zero-missing phenomenon, a condition in which the current through the circuit breaker fails to reach zero, can affect breaker operation and system stability, particularly in shunt-compensated systems. Key factors influencing this issue include cable length, cable configuration, reactive power compensation, and switching strategies. Using EMTP/ATP simulations based on a real grid model, the study evaluates various mitigation strategies for the zero-missing phenomenon, such as pre-insertion resistors, compensation ratios, and connections to high-power loads. Transient overvoltages on cable cores and sheaths during switching operations are also analyzed.
Keywords
The zero-missing phenomenon, shunt reactor, mixed transmission lines, switching overvoltage
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
References
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