工作票制度是保证电力系统安全生产的根本制度，是电力运行管理中一项防止误操作的有效安全措施。
The rule of electric work tickets is an essential rule to assure electric Power system safe production, is a effective safe measure to prevent wrong operation.
“我们所学到的主要经验之一就是，需要开发安全措施时，发布挑战要比下达命令更为有效，”塞格·瑞恩说道。
"One of the main lessons we learned is that issuing challenges is more effective than giving orders when there is a need to develop security measures," Sagarin said.
在初始评估中经济有效地实现的安全措施可能需要替换为更佳方案，以节省资金。
The safeguard that was cost-effectively implemented in the original assessment may need to be replaced with a better one for less money.
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