| 季节因素对发变电站地表高阻层安全效果的影响 |
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| 引用本文： | 孙为民,何金良,曾嵘,高延庆,潘延庆,潘溪渊.季节因素对发变电站地表高阻层安全效果的影响[J].中国电力,2000,33(1):62-64. |
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| 作者姓名： | 孙为民 何金良 曾嵘 高延庆 潘延庆 潘溪渊 |
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| 作者单位： | 1. 山东省电力工业局,山东,济南,250001
2. 清华大学,电机工程与应用电子技术系,北京,100084 |
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| 摘 要： | 发变电站接地系统可通过提高表层土壤电阻率来提高人体允许的跨步电坟和接触电压，处通过人体的电流，但季节因素将影响高阻层的安全性能，导致接触电压和跨步电压的改变，危及电力系统的安全稳定运行。文中采用数值计算绎地表高阻层安全性能的影响。采用ＤＬ－Ｔ６２１－１９９７标准中计算公式得到的允许跨步电压和接触电压过于偏高，高于ＩＥＥＥＳｔｄ８０－１９９７标准推荐公式的值。采用高阻层后，地网表民压在雨季明显减小；
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| 关 键 词： | 接地系统 高阻层 人身安全 发变电站 |
Influence of Seasonal Factor on Safety of Ground Surface High Resistivity Layer in Substations |
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| SUN Wei-min HE Jin-liang,ZENG Rong,et,al.Influence of Seasonal Factor on Safety of Ground Surface High Resistivity Layer in Substations[J].Electric Power,2000,33(1):62-64. |
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| Authors: | SUN Wei-min HE Jin-liang ZENG Rong et al |
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| Abstract: | The permissible step and tonuch voltage of grounding system for human body in suhstatinos may be increased byincrease of surface soil resistivity, and the current through human body may be correspondingly reduced. However, seasonalfactor may affect the safety characteristic of high ground resistivity layer. causing the change of step and touch voltage. Thepermissible step and touch voltage calculated from DI/T621-1997 standard formula seens too high, higher than that byIEEE Std80-1997 standard recommended formula. When using high resistivity layer. the touch voltage will be lower duringrainy season, but during cold season, it will be higher than those without using high resistivity layer.Therefore,the effect ofseasonal factor on safety of grounding system shall be considerde. |
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| Keywords: | grounding system high resistivity layer seasonal factor: safety characteristic step and touch voltage |
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