Abstract: In practical application, turnouts equipped with DC time-limited protection devices often fail to be operated successfully once, and return to normal after multiple operations, with unknown reasons, causing great trouble to on-site maintenance management and driving safety. This paper conducts an in-depth analysis of the difficult issues in the application of DC time-limited protection, and proposes two improvement schemes: increasing the spacing between relay contacts and connecting the resistance and capacitance components in parallel to the control relay contacts inside the DC time-limited protection device, so as to improve the safety and stability of the DC time-limited protection device.

Key words: DC time-limited protection device, application analysis, improvement plan

摘要： 在实际的运用中，安装有直流限时保护装置的道岔经常会出现一次无法操纵成功的问题，经多次操纵后恢复正常，且原因不明，给现场维护管理及行车安全造成很大困扰。针对直流限时保护在运用中的难点问题进行深入分析，并提出增加继电器接点间距、在直流限时保护器内部控制继电器接点上并联阻容原件的两种改进方案，达到提升直流限时保护装置安全性和稳定性目的。

关键词: 直流限时保护装置, 应用分析, 改进方案