Abstract
Subsea observation networks have been increasingly used to explore oceans. However, the stability of the entire system remains a crucial problem. In 2015, flashover discharge occurred in a transmission line during a sea trial in the South China Sea, thereby resulting in node destruction and serious losses. This study investigates flashover discharge in the transmission line and aims to determine its influences on the nodes. We use a damaged submarine cable to conduct a flashover discharge fault experiment and analyze the causes of this voltage change law. A cascade of lumped parameter model is adopted for the transmission line, and the optimal segment length is confirmed through simulation. Step response is applied to the study of flashover discharge, and the results agree well with the PSpice simulation results. Then, simulations and experiments on flashover discharge are conducted on the basis of the cascade of lumped parameter model. Results show that voltage surge is generated in the output side with the occurrence of flashover discharges, especially when they are continuous. An effective method of adding silicon stacks at the converter input and connecting transient voltage suppressor (TVS) in parallel at the output is proposed to suppress this oscillation.
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