Carrier protection has been playing a very important role in normal operation of HV transmission line. It can cut-off the fault quickly to ensure the system operating stably.

高频保护对于高压线路的正常运行起着极其重要的作用，它可以快速切除故障，保障系统的稳定。

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At present, GIS system is the most integrated system to analyze geographic environment, a good carrier to cultivate normal school students in terms of integrate practical activity.

IS系统是目前综合性最强的地域环境综合分析系统，是培养师范生综合实践活动能力的良好载体。

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