There has been a growing demand of electric power in many urban agglomerations. To address this demand, 110-kV power networks are regularly expanded inside and around cities in Poland. These power networks are often constructed as underground cable lines. The 110-kV cable lines are usually designed as three single-core cables laid in a common route. In case of long 110-kV cable lines, the cross-bonding method is applied to the connection of metal sheaths of these cables. Additionally, one or more earth continuity conductors are laid along the main cable line and earthed at both their ends. These earth continuity conductors can be uninsulated and can cause electric shock hazard (danger step voltages). The problem defined in this paper consists of an attempt to calculate the expected step voltages for different considered earth continuity conductor arrangements in 110-kV cable lines and to compare the obtained results to admissible values of the voltages found in an appropriate standard. Protection against electric shock, calculation of earthing resistance, and step voltages, as well as simulation studies in case of sample 110-kV cable lines have been described in the paper. The results show the analyzed layouts of 110-kV cable lines have significant impact on the values of voltages occurring in and around earth continuity conductors. The maximum values of earth electrode voltage (and in this way expected touch voltages), as well as step voltages occur in the layout of single cable line and single earth continuity conductor arranged in parallel.

中文翻译：

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评估来自 110 kV 电缆线路中接地连续导体的电击危险

许多城市群对电力的需求不断增长。为了满足这一需求，110 kV 电网定期在波兰城市内部和周围扩展。这些电力网络通常构建为地下电缆线路。110 kV 电缆线路通常设计为三根单芯电缆铺设在一条公共路线上。在110kV长电缆线路的情况下，这些电缆的金属护套的连接采用交叉连接方法。此外，一根或多根接地连续导体沿主电缆线路敷设，并在其两端接地。这些接地连续导体可能是非绝缘的，可能会导致电击危险（危险阶跃电压）。本文中定义的问题包括尝试计算 110 kV 电缆线路中不同考虑的接地连续性导体布置的预期阶跃电压，并将获得的结果与适当标准中的允许电压值进行比较。论文中描述了电击保护、接地电阻的计算和阶跃电压，以及在 110 kV 电缆线路示例的情况下的模拟研究。结果表明，分析的 110 kV 电缆线路布局对接地连续导体内部和周围的电压值有显着影响。接地电极电压的最大值（以及以这种方式预期的接触电压）以及阶跃电压出现在平行布置的单根电缆线和单根接地连续导体的布局中。