numerical protection造句

nanjing nari-relays electric co ., ltd is a state high-tech enterprise, key software enterprise, chinese top 100 software enterprises and top 100 electrical enterprises specialized in the research and manufacturing of numerical protection, automation and control system for both hvac and hvdc power systems
南京南瑞继保电气有限公司是专业从事电力系统保护和控制领域的技术研究、产品开发、生产销售和工程服务，是国家级重点高新技术企业、国家规划布局内重点软件企业、中国软件百强企业和中国电气工业百强企业。
It's difficult to find numerical protection in a sentence. 用numerical protection造句挺难的