智能化改造前，午山 变电站已全部采用电子式互感器，220kV系统为室内气体绝缘金属封闭开关(gas insulated switchgear，GIS)组合电器，双母线接线方式。
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介绍了ZFN13-40．5（Z）气体绝缘金属封闭开关设备的使用环境、技术参数、结构布置、产品特点和主要型式试验等内容。
The paper introduces suitable environmental conditions, technical parameters, general layout structure and main type tests of ZFN13-40.5(Z) gas insulated metal-enclosed switchgear (GIS).
为减少气体绝缘金属封闭式开关设备（GIS）产品运行期间的成本，必须改变维护方式，即从设备的定期维护改变到状态维护。
To reduce the cost during operation for gas insulated and metal enclosed switchgear (GIS), it must be changed for the maintenance way from periodic to condition - based.
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