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介绍了一种新型数字式高压线路电流纵差保护装置的通信技术。给出了不同的通道形式下装置的通信连接整体方案。在评价已有的几种交流采样同步方法和分析电力光纤通信的发展趋势与特点之后，提出了一种改进的交流采样同步方法。该方法是一种自适应型的采样时刻调整法，其通信方式简单，可适应路由变化的通信自愈环网。分析了通信过程中数据出错的原因和特点，然后给出了根据汉明码纠错原理推出的纵差保护数据通信的纠错方法，借以提高保护的动作速度。为了防止误纠错，采用了 Ｃ Ｒ Ｃ 检验与纠错相结合的方法。最后提出了一种通道监视的方法，以方便装置的调试与运行。该技术已应用到实际装置中，效果良好。
A new type of digital HV line current differential protection device communication technology is introduced. The overall scheme of the communication connection of the devices under different channel forms is given. After evaluating several existing AC sampling synchronization methods and analyzing the development trend and characteristics of power optical fiber communication, an improved AC sampling synchronization method is proposed. The method is an adaptive sampling timing adjustment method, the communication method is simple, can adapt to changes in the communication network routing self-healing. The reasons and characteristics of data errors in the communication process are analyzed. Then, an error correction method for data communication of TDOA based on the Hamming code error correction principle is given to improve the speed of protection. In order to prevent error correction, using C R C test and error correction method. Finally, a channel monitoring method to facilitate the commissioning and operation of the device. The technology has been applied to the actual device, the effect is good.