利用接地网综合测试系统分析接地网故障的研究

来源 :2009年云南电力技术论坛 | 被引量 : 0次 | 上传用户:shalaoshi
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  变电站的地网对电力系统的安全、稳定运行有着极为重要的作用。从各类的事故报告中发现,由于忽略了对接地装置的检查、接地施工技术不完善、外力破坏等原因,使接地装置的电阻升高和接地断线,从而导致直流系统的消失,甚至造成电气一次设备故障。接地不好时。导致设备外壳带有电压、危害设备及人员安全。通过综合测试系统实现变电站异频法小电流测试接地电阻、地表电位分布、接地体导通测试、接触电压和跨步电压的现场测试工作,利用各种电气参数可以科学可靠的对变电站接地网状况进行有效的综合评价,从而提高设备的可靠性和安全性。
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2008年的冰雪灾害对电网的安全稳定运行提出了新的要求。本文针对输电网在遭遇严重故障后的电压稳定裕度评估与恢复策略展开研究,提出了一种新的不依赖于预想故障集的电压稳定裕度和电网最优恢复策略快速计算方法,该方法具有结构简单、计算速度快、精度高的优点,可以应用于未来实用化的电力系统应急调度平台中。通过IEEE118节点系统算例分析,验证了该方法的有效性。