大型发电机组定子接地保护3U_0定值整定的探讨  

Discussion about stator grounded protection 3U_0 setting in large power plant

作　　者：杨文超[1] 张立港 李红军[3] 

机构地区：[1]北京国华电力技术研究中心,河北廊坊065201 [2]北京圣海汇泉电力科技发展有限公司,北京100069 [3]河北国华定洲发电有限责任公司,河北定洲073000

出　　处：《继电器》2007年第4期18-21,共4页Relay

摘　　要：通过对大型发电机组定子接地保护的作用和目前所使用的定子接地保护整定方法进行了介绍,分析计算了中性点经配电变压器接地的发电机接地电流大小与保护范围之间的关系,结合《导则》规定的动作整定原则,提出了发电机定子接地保护3U0定值与出口时限的选择方法,并通过实例计算主变高压侧单相接地故障产生的传递电压对定子接地保护的影响,最后给出了三段式定子接地保护的整定建议。By introducing stator grounded protection and setting method used in large power plant, this paper analyzes and calculates the relationship between current value while grounded fault and range of protection by single transformer at neutral point.Combined with the principle of settings, it firstly provides the selectable method of generator grounding fault protection with operative time, and then calculates the influence to the stator grounded protection by transferred voltage when single phase grounded fault occurs in the main transformer high-voaltage side, at last puts forward a setting suggestion about 3-step stator grounded protection.

关 键 词：发电机组 定子接地保护 3U0 定值 

分 类 号：TM307[电气工程—电机]