变电站直流回路中防交流窜入的直流试验电源设计

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中图分类号：TM721.1 文献标志码：A 文章编号：1003-5168（2025）13-0015-05

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.13.002

Design of DC Test Power Supply for Preventing AC Intrusion in DC Circuitof Substation

ZHANG LiujieWANG Bohan LI Ang ZHANG Wenbo （Super High Voltage Company of State Grid Henan Electric Power Company， Zhengzhou 45Oo00， Chin

Abstract：[Purposes] The DC system of a substation is acrucial part of the power grid operation.It provides energy for secondary equipment and ensures the safe and stable operation of primary equipment. However， the intrusion of AC into the DC system poses a serious safety risk in the operation of substations.This paper elaborates in detail on the development processof a DC test power supplythat can monitor the intrusion of AC into the DC loop.[Methods] In response to the problem of AC intrusion，this study analyzes its hazards and the deficiencies of existing measures，and then proposes a development scheme for the test power supply. By investigating the power supply topology，control and protection circuits，AC intrusion detection，and the switching of DC power supply output，a DC test power supply with innovative features has been designed. It includes detection technologies based on the differential voltage method and the DC-blocking capacitor method，multiple output interfaces and selectable output voltage ranges.[Findings] Test results demonstrate that， the power supply protection response is rapid， the output voltage stability is within ±0.5% ，with the detection accuracy exceeding 99 % . [Conclusions] The proposed power supply is expected to prevent accidents caused by the intrusion of AC，improve the operational safety of the power grid，and provide strong support for the operation and maintenance of substations.

Keywords： DC circuit; AC intrusion; DC test power supply; monitoring and protection

0 引言

变电站二次回路中的直流系统是现代电力系统的重要组成部分，可以为各类测控、继电保护及故障录波等二次设备稳定地提供工作电源，确保这些设备能够正常运行，从而实现对一次设备的精确控制与实时监测[]。（剩余3907字）