智能变电站合并单元延时特性现场测试仪的设计

Design of field testing instrument for merging unit delay characteristics in smart substation

分析了智能变电站合并单元的同步问题以及通过现场核相及查看差流这一验证差动保护各侧电流是否同步的方法的局限性。提出了智能变电站合并单元延时特性现场测试仪的设计需求,基于需求分析提出一种现场测试仪的体系结构并进行了详细设计。最后对依据本设计方法实现的测试仪的时间粒度与合并单元的时间响应配合方面进行了详细计算和比较分析。分析表明,该测试仪可有效验证合并单元延时参数的现场正确设置,杜绝误整定,符合现场验收需求。

The synchronization of merging unit in smart substation and limitations of the method of validating whether the current at each side of differential protection is synchronous by using on-site phase and differential current check are analyzed. The design requirements of field testing instrument with merging unit delay characteristics of smart substation is proposed. The system structure and the detailed design of field testing instrument is introduced based on the design requirements. Finally, the detailed calculation and comparative analysis of tester time granularity and the time response with the merging unit is done. Analysis shows that, the tester can validate that the merging unit delay parameters are set correctly, which can prevent incorrect setting and accord with the site acceptance requirements.