Application shows that the telecontrol channel based on PSTN provides an applicable method of real-time data transmission for remote mountainous area, area obsessed by fund shortage, and newly-constructed substations and switching stations.

• 这为边远山区，资金紧张的地区和新建变电站、开关站实现实时数据传输的要求提出了一种可行的方案，有一定的推广实用价值。