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Cross-bonding cable and box model based on pulse reflection measurement

机译：基于脉冲反射测量的交叉连接电缆和盒模型

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摘要

Transients from lightning strikes can enter underground cables at overhead line to power cable transitions. Possible overvoltages on these surges at cross-bonding connections of the cable screens are of major concern. A model is developed for modelling overvoltages from transient signal propagation through a combined cross-bonding cable and box. This model is applied to the first Dutch 400 kV cable connection. Such model incorporates model parameters whose values depend on design details of the cross-bonding box. The values for these model parameters are extracted from the measured transmission and reflection signal on steep pulses injected into the actual cross-bonding box configuration. The model combines transmission line description for the cross-bonding cables with mainly inductive behaviour of the cross-bonding box. The obtained results are verified by measurements. The model is applied to investigate overvoltages induced at the cross-bonding cable and box on 1.2/50 µs impulse voltage injection representing a lightning impulse voltage applied to the core conductor of the cross-bonding cable. Furthermore, the effectiveness of surge arresters to reduce overvoltages at the cross-bonding cable screen is demonstrated by simulations with this model in PSCAD.
机译：雷击产生的瞬变可进入架空线的地下电缆到电源电缆的过渡。在电缆屏蔽层的交叉连接处，这些浪涌可能产生的过电压是主要关注的问题。开发了一个模型，用于对通过组合的交叉键合电缆和盒的瞬态信号传播产生的过电压建模。此模型适用于第一个荷兰400 kV电缆连接。这种模型包含模型参数，其值取决于交叉键盒的设计细节。这些模型参数的值是从注入到实际的交叉键箱配置中的陡脉冲上的测量透射和反射信号中提取的。该模型将交叉粘合电缆的传输线描述与交叉粘合盒的主要电感特性结合在一起。通过测量验证所获得的结果。该模型用于调查在1.2 / 50 µs脉冲电压注入情况下在交叉连接电缆和盒子上引起的过电压，该电压代表施加到交叉连接电缆芯线的雷电冲击电压。此外，通过在PSCAD中使用此模型进行的仿真证明了电涌放电器降低交叉连接电缆屏蔽层过电压的有效性。

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