變電站直流回路中防交流竄入的直流試驗(yàn)電源設(shè)計(jì)

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中圖分類號：TM721.1 文獻(xiàn)標(biāo)志碼：A 文章編號：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

變電站二次回路中的直流系統(tǒng)是現(xiàn)代電力系統(tǒng)的重要組成部分，可以為各類測控、繼電保護(hù)及故障錄波等二次設(shè)備穩(wěn)定地提供工作電源，確保這些設(shè)備能夠正常運(yùn)行，從而實(shí)現(xiàn)對一次設(shè)備的精確控制與實(shí)時監(jiān)測[]。（剩余3907字）