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针对海底交流电缆输电系统发生的单相短路和三相短路故障,在PSCAD/EMTDC平台上搭建仿真模型,仿真计算了短路故障引起的暂态过电压。对于110 kV中性点接地和35 kV中性点不接地海底电缆输电系统,分别对不同输送功率、不同输送距离和不同短路容量等情况下海缆的暂态过电压进行了仿真,计算了海缆线路上产生的最大过电压值,分析了最大过电压与这些变量之间的变化关系以及内在的物理机理。研究结果对于海缆线路和变电站的绝缘水平以及其他系统参数的确定具有参考价值。
Aiming at the single-phase short-circuit and three-phase short-circuit fault occurred in the transmission system of submarine AC cable, a simulation model was built on the platform of PSCAD / EMTDC and the transient over-voltage caused by short-circuit fault was simulated. For the 110 kV neutral point grounding and 35 kV neutral ungrounded submarine cable transmission system, the transient overvoltage of submarine cable under different transmission power, different transmission distance and different short circuit capacity were simulated respectively. The maximum overvoltage value generated on the line analyzes the relationship between the maximum overvoltage and these variables as well as the underlying physical mechanism. The research results have reference value for the insulation level of submarine cables and substations and the determination of other system parameters.