According the application experience of the project such as Nanjing Subway,some characteristics and advantage of Siemens optical longitudinal differential protection device 7SD610 are illustrated an.

• 结合南京地铁一号线等项目的工程应用经验,阐明了7SD610光纤纵差保护装置的一些特点和优势,并提出了一些建议。