分體式有載分接開關(guān)結(jié)構(gòu)可靠性驗(yàn)證及優(yōu)化

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中圖分類號：TM403.4 文獻(xiàn)標(biāo)志碼：A 文章編號：1007-449X（2025）07-0012-10

Reliability verification and optimization of split-type on-load tap changer structure

LI Yuanqi1， GE Yining1， WANG Li1， SHAO Yuhang2， LI Jinzhong3， WANG Ke4，LIU Xuandong1，LI Gang4，LI Geqi4

（1.State KeyLaboratoryofElectrical InsulationandPower Equipment，Xi’an Jiaotong University，Xi’an71O049，China; 2.State Grid Tianjin Electric Power Company High Voltage Branch， Tianjin 30O232， China; 3.State Grid Corporationof China，Beijing100031，China；4.China Electric Power Research Institute，Beijing 100192，China）

Abstract：The on-load tap changer （OLTC） has a risk of electrical faults during switching，potentially leading to accidents. A new split-type design was proposed，in which the switching oil chamber is isolated from the transformer body，theoretically reducing the likelihood of explosions.To validate this de

收稿日期：2024-12-30

基金項(xiàng)目：國家重點(diǎn)研發(fā)計(jì)劃（2021YFB2402100）

sign—particularly the reliability of key isolation structures such as the lead bushing under arc fault conditions—a simulation model was developed using pressure-acoustic and acoustic-structural coupling methods. The effcts of fault energy，fault location，and extreme scenarios where the arc fault impacts the isolation structure near the lead bushing were analyzed. The results show that increased fault energy and a fault source located further from the pressure relief device lead to higher pressure inside the split oil tank. The auxiliary oil tank provides efective protection for the main tank.In extreme cases，the lead bushing remains reliable，but regions such as the oil chamber base and tank connections are prone to stress concentration and potential damage. Based on these findings，structural optimization is shown to improve stress distribution.

Keywords：on-load tap changer;arc fault； separate arrngement； finite element simulation； distributionof pressure；distribution of stress

0引言

有載分接開關(guān)（on-loadtapchanger，OLTC）作為電力變壓器和換流變壓器的核心部件，能夠通過檔位的調(diào)節(jié)對變壓器的輸出電壓進(jìn)行在線切換，使得變壓器的輸出在不切斷負(fù)荷的條件下保持相對穩(wěn)定，在輸電系統(tǒng)中發(fā)揮著至關(guān)重要的作用[1-3]OLTC的切換過程涉及復(fù)雜的結(jié)構(gòu)聯(lián)動(dòng)以及大量零部件的整體配合[4-5]，其中任何零部件的機(jī)械故障都可能導(dǎo)致切換動(dòng)作的中斷，進(jìn)而引起電氣故障[6-8]。（剩余12832字）