基于Gradient-Closing变换的接地故障识别  

Identification of grounding fault using Gradient-Closing transform

作　　者：罗宁昭[1] 张晓锋[1] 刘佳 

机构地区：[1]海军工程大学电器与信息工程学院,湖北武汉430033 [2]海军驻武汉438T军事代表室,湖北武汉430033

出　　处：《电力系统保护与控制》2011年第23期74-78,共5页Power System Protection and Control

摘　　要：无论陆地配电网或是船舶电网中,单相接地所占故障的比例最大。当前采用高电阻接地方式的电网,在发生金属性接地或电缆单次放电时,接地电阻不但不能抑制过电压,反而使故障点电流增加。从单相接地实验出发,提出一种利用数学形态学中的Gradient变换和Closing变换级联的方式识别接地故障类型的方法。该方法能将金属性接地和间歇性接地区分开,并且忽略掉单次放电的情况。通过大量实验和仿真对该方法进行验证,该方法在不同条件下均有良好的故障识别能力。Whether the power distribution network is on land or ship, the single-phase ground faults account for the largest proportion. In the HRGpower grid, when intermittent arc grounding or cable metallic single discharge appeares, grounding resistance will not only fail to suppress over-voltage, but also can increase the fault current. Based on the single-phase fault experiment, this paper proposes a method of using the Gradient Transform and Closing transform cascade to identify the types of ground fault. This method can separate metal grounding and intermittent arc grounding, and ignore the situation of the single discharge. Using experiment and simulation to verify the method, it is found the method has good ability to identify the fault under different conditions.

关 键 词：高电阻接地 金属性接地 间歇性弧光接地 数学形态学 故障识别 

分 类 号：TM862[电气工程—高电压与绝缘技术]