分析一起220kV线路光纤差动保护误动作后的故障录波图及装置报文，并提出防范类似事故的措施。%This essay analyzes the fault recording graph and the message of the device after the malfunction of the dif -ferential protection of the optical fiber of a 220kV line as well as presenting relevant precautionary measures for sim-ilar accidents .
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