Abstract: This paper introduces the composition and logic of the circuits of the inter-station block systems based on 64D, focuses on the analysis of the characteristics and design idea of 64D circuits, identifies two typical defects of these circuits, and analyzes the causes and logic of such defects. This paper also puts forward some suggestions on the development of the inter-station block systems to help the next generation of systems remedy these current defects.

Key words: 64D, semi-automatic block, inter-station block, relay circuit

摘要： 介绍基于64D的站间闭塞系统电路的组成和逻辑，着重分析64D电路的特点及其背后的设计思路，发现64D电路目前存在的两个典型缺陷，研究其产生原因与逻辑。为站间闭塞系统的发展提出多项改进建议，有助于下一代系统克服目前64D电路存在的固有缺陷。

关键词: 64D, 半自动闭塞, 站间闭塞, 继电电路