降低变电站工频接地电阻的分析

Brief Discussion on Reducing Power-frequency Ground Resistance of Substation

随着我国经济的飞速发展,人民生活水平不断提高,对电力的需求急剧增加,而且对电能质量、供电可靠性及安全供电提出了更高的要求。目前,一个庞大而坚强的输供电网络已经形成。为了确保电网安全可靠稳定运行,需要采取众多的保护措施,变电站接地装置的设置就是其中非常重要的一项内容。为了降低变电站工频接地电阻,应准确计算各类接地装置的工频接地电阻值,分析影响接地装置工频接地电阻的主要因素,恰当处理高土壤电阻率地区居高不下的工频接地电阻。

With the rapid development of economy and constant improving of the standard of living, it makes the demand of power increase quickly and places greater demands on power quality, supply reliability and supply security. A huge and strong transmissionsupply network has been founded at present. In order to ensure safe operation of power network, we ought to adopt a great many of protection measures. One of the important contents is to set up the grounding device of substation. We should calculate the power - frequency resistance value of grounding devices accurately. We also should analyze the main influencing factors of power - frequency resistance value of grounding devices and deal with high power - frequency ground resistance of high soil resistivity in order to reduce power - frequency ground resistance of substation.