This paper presents three schemes of relay protection after transformation and analyzes the advantages and disadvantages of each scheme, and selects the best one so as to offer the best service.

• 本文提出了三种炉变继电保护设计方案；并对各方案优劣进行了一一分析、论述；从中优选也最佳方案；为生产提供最佳服务.