一种新型TV二次回路多点接地查找方法

A New Searching Method of Multi Grounding Points in the Secondary Circuit of TV

TV二次回路存在多点接地可能会引起保护的不正确动作,因此有必要快速、有效地判断TV二次回路是否存在多点接地。介绍电流法、电压法、电阻法以及分流法等传统TV二次回路多点接地的查找方法,分析了其原理及存在的不足。在此基础上,提出一种基于双铁心多绕组电流互感器的查找方法,并论述了其测试原理及测试方法。理论分析及试验结果表明,该方法能快速、有效地判断TV二次回路是否存在多点接地,并准确查找出接地故障点。同传统方法相比,该方法简单实用,具有良好的使用效果和推广价值。

Multi grounding points in the secondary circuit of TV may cause the incorrect action of protection, so that it is necessary to judge quickly and effectively whether there is multi grounding points in the secondary circuit of TV or not. Traditional finding methods for multi grounding points in the secondary circuit of TV are introduced including current method, voltage method, resistance method and shunt method, and their principles and shortages are analyzed. A new finding method based on dual-core and multi-windings current transformer is proposed. Its test principle and method are introduced. Theoretical analysis and test results show that the method can judge quickly and effectively whether there is multi grounding points in the secondary circuit of TV or not, and find precisely the location of grounding fault. Comparing with the traditional methods, the proposed method is simple and practical, and has better usage effect and popularization value.