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Novel differential protection based on the ratio of model error indices in time-domain for transmission cable system

机译：基于时域模型误差指标比的新型差动保护

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摘要

The significant shunt parameters of underground cable (UC) systems, as well as the frequently-used shunt reactor, draw many attentions in the implementation of the differential relay. In this paper, a novel ratio of model error indices (RMEIs) based differential protection (RMEIDP) scheme is proposed. The internal/external faults lead to different fault component networks, from which the proposed RMEIDP distinguishes the fault states by identifying the corresponding fault component models. The RMEIDP scheme, incorporating both the external fault differential model and the internal one, is theoretically unaffected by the cable charging current and weakens the impacts of shunt reactor. What's more, the proposed RMEIDP scheme is adaptive for not only the fault steady state but also the fault transient state, since the time-domain fault information is directly used in the model error index (MEI) computation. DIgSILENT-based EMT simulation results of the UC transmission system prove the effectiveness and merits of the new differential relay scheme.
机译：地下电缆（UC）系统以及常用的并联电抗器的重要并联参数在实施差分继电器时引起了很多关注。本文提出了一种新的基于模型误差指数（RMEI）的比率差动保护（RMEIDP）方案。内部/外部故障导致不同的故障组件网络，所提出的RMEIDP通过识别相应的故障组件模型来区分故障状态。 RMEIDP方案结合了外部故障差分模型和内部故障差分模型，理论上不受电缆充电电流的影响，并削弱了并联电抗器的影响。此外，由于时域故障信息直接用于模型误差指数（MEI）计算中，因此所提出的RMEIDP方案不仅适用于故障稳态，而且适用于故障瞬态。 UC传输系统基于DIgSILENT的EMT仿真结果证明了新型差分中继方案的有效性和优点。

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