针对特高压电网建设对超长距传输提出的更高要求，提出了新的技术方向——塔内光中继。分析了塔内光中继的理论依据并设计了技术方案，在哈密～郑州特高压直流输电光纤通信工程石城至环县段实现了我国首个塔内光中继实验工程,工程顺利开通，运行稳定，验证了塔内光中继方案的可行性。随着我国电网建设的不断发展，塔内光中继将得到更广泛的应用。

In order to satisfy the increasingly higher requirements for ultralong haul transmission in ultrahigh voltage grid constructions, we propose a new technical approach: optical repeaters on transmission line towers. We analyze the theoretical basis for this approach, design the relevant technical scheme and realize the first pilot project of optical repeaters on transmission line towers in ShichengHuanxian section of the HamiZhengzhou fiberoptic communication project for ultrahigh voltage DC power transmission. The section project has been cut over and operating steadily, verifying the feasibility of this solution. With the constant construction of power grids in China, this solution will find still wider applications.