| 黄军玲,高 强.27. 5 kV 电缆金属护层雷击特性的建模与仿真[J].电子测量与仪器学报,2020,34(7):210-217 |
| 27. 5 kV 电缆金属护层雷击特性的建模与仿真 |
| Modeling and simulation of lightning feature on the metal sheath of 27. 5 kV cable |
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| DOI： |
| 中文关键词: 27. 5 kV 分布式参数 接地电阻 阻抗 雷击 |
| 英文关键词:27. 5 kV distributed parameters grounding resistance impedance lightning stroke |
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| 中文摘要: |
| 基于行波理论,通过仿真计算不同分段情况下 27. 5 kV 电缆分布式参数等效模型上雷电流波传播的速度,对比验证模
型的准确性。 通过理论计算确定金属护层装设护层保护器的必要性和护层保护器装设在首端的合理性。 在此基础上,采用仿
真软件研究雷电流波经接触网入侵电缆线芯时电缆长度、金属护层末端接地电阻和线芯末端阻抗对金属护层雷击感应电压的
影响。 结果表明,长度约为 800 m 的电缆其金属护层雷击感应电压最大值的平均值最小;接地电阻在 2. 5 ~ 3 Ω 内时,电缆金属
护层雷击感应电压最大值的平均值最小,且均低于 25 kV,当接地电阻超过 5 Ω 时,外护套冲击耐受电压小于电缆金属护层雷
击感应电压最大值,可导致外护套击穿;当接有较大容性阻抗或电缆末端短路,外护套冲击耐受电压远小于金属护层雷击感应
电压,而接有较大感性阻抗或电缆末端开路时,金属护层雷击感应电压低于外护套冲击耐受电压。 |
| 英文摘要: |
| Based on the traveling wave theory, the distributed parameters equivalent model of 27. 5 kV cable was built and verified by
simulating the speed of lightning wave in different segments. Make sure the necessity of the fitted protector on metal sheath and the
reasonableness of protection provided in the first end by theoretical calculations. On this basis, when the lighting current intruded upon
the cable core along the catenary, one software was adopted to simulate and study the influence of the cable length, grounding resistance
of the metal end and impedance of the core end on the lighting induced voltage of cable metal sheath. The results show that the average
of the maximum value of sheath lightning induced voltage may be the smallest when the cable length is 800 m; when the grounding
resistance value is in the range of 2. 5~ 3 Ω, the average of the maximum value of sheath lightning induced voltage may be the smallest,
and they are lower than 25 kV, if the grounding resistance value is more than 5 Ω, the maximum value of sheath lightning induced
voltage may exceed the lightning impulse withstanding voltage of outer sheath, leading to the breakdown of outer sheath; when the cable
end is connected to a short circuit or a larger capacitive impedance, the sheath lightning induced voltage may be very large and may go
far beyond the lightning impulse withstanding voltage of outer sheath, while the cable end is connected to an open circuit or an inductive
impedance, the sheath lightning induced voltage may be smaller. |
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