The PSL641 digital signal processor (DSP) protection measuring control device originally used in a generator unit of Anyang Steel could only reflect the electrical changes on the line side, unable to sufficiently protect the lead-in wire of the generator. After it was re-placed by a PSL646U optical fiber current differential DSP protection measuring control device of the same manufacturer with the same opening size, same network communication protocol and similar control circuit and signal circuit, the protection requirement has been satisfied.%某发电机组原来使用PSL641型数字式线路微机保护测控装置，只能反映线路一侧的电气量变化，无法满足对发电机联络线的保护，将其改为同一生产厂家，且开口尺寸相同、网络通讯规约相同、控制回路、信号回路相近的PSL646U数字式光纤电流差动微机保护测控装置，满足了保护要求。
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