高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2009年
10期
2340-2343
,共4页
范建斌%谷琛%殷禹%周军%王伟(小)%李成榕%姜一涛%安冰%王益旭%杨波%樊飞
範建斌%穀琛%慇禹%週軍%王偉(小)%李成榕%薑一濤%安冰%王益旭%楊波%樊飛
범건빈%곡침%은우%주군%왕위(소)%리성용%강일도%안빙%왕익욱%양파%번비
特高压%直流电晕%表面水滴%电晕笼%起晕电压%可听噪声
特高壓%直流電暈%錶麵水滴%電暈籠%起暈電壓%可聽譟聲
특고압%직류전훈%표면수적%전훈롱%기훈전압%가은조성
UHV(ultra high voltage)%DC corona%surface water drop%corona cage%corona onset voltage%audible noise
雨、雾天气情况下导线表面形成的水滴会导致导线周围电场分布发生严重畸变,从而改变导线的电晕特性.我国第1条特高压直流输电工程--云广线处于多雨地区,导线电晕特性需考虑水滴因素的影响.为研究导线表面水滴对特高压输电线路电晕特性的影响程度,划分了导线表面水滴的等级,建立了导线电晕特性测试系统,测量了不同水滴等级下,电晕笼中导线的起晕电压、可昕噪声水平等特征量,获得了导线表面水滴对导线电晕特性的影响规律,并据此对我国特高压直流输电线路的工程设计提出了建议.研究结果表明:导线的起晕电压随导线表面水滴等级的提高迅速下降,最低可降到原来的一半左右;起晕后,导线发生剧烈的舞动,导线表面的水滴在电场的作用下会被"蒸发"或甩掉;水滴会使导线起晕时的可听噪声值降低;在相同的电压作用下,导线的可听噪声水平随导线表面水滴等级的增加而提高.
雨、霧天氣情況下導線錶麵形成的水滴會導緻導線週圍電場分佈髮生嚴重畸變,從而改變導線的電暈特性.我國第1條特高壓直流輸電工程--雲廣線處于多雨地區,導線電暈特性需攷慮水滴因素的影響.為研究導線錶麵水滴對特高壓輸電線路電暈特性的影響程度,劃分瞭導線錶麵水滴的等級,建立瞭導線電暈特性測試繫統,測量瞭不同水滴等級下,電暈籠中導線的起暈電壓、可昕譟聲水平等特徵量,穫得瞭導線錶麵水滴對導線電暈特性的影響規律,併據此對我國特高壓直流輸電線路的工程設計提齣瞭建議.研究結果錶明:導線的起暈電壓隨導線錶麵水滴等級的提高迅速下降,最低可降到原來的一半左右;起暈後,導線髮生劇烈的舞動,導線錶麵的水滴在電場的作用下會被"蒸髮"或甩掉;水滴會使導線起暈時的可聽譟聲值降低;在相同的電壓作用下,導線的可聽譟聲水平隨導線錶麵水滴等級的增加而提高.
우、무천기정황하도선표면형성적수적회도치도선주위전장분포발생엄중기변,종이개변도선적전훈특성.아국제1조특고압직류수전공정--운엄선처우다우지구,도선전훈특성수고필수적인소적영향.위연구도선표면수적대특고압수전선로전훈특성적영향정도,화분료도선표면수적적등급,건립료도선전훈특성측시계통,측량료불동수적등급하,전훈롱중도선적기훈전압、가흔조성수평등특정량,획득료도선표면수적대도선전훈특성적영향규률,병거차대아국특고압직류수전선로적공정설계제출료건의.연구결과표명:도선적기훈전압수도선표면수적등급적제고신속하강,최저가강도원래적일반좌우;기훈후,도선발생극렬적무동,도선표면적수적재전장적작용하회피"증발"혹솔도;수적회사도선기훈시적가은조성치강저;재상동적전압작용하,도선적가은조성수평수도선표면수적등급적증가이제고.
Water drop on conductor line surface caused by rain or fog would distort the voltage gradient around the conductor line and change the corona performance of conductor line. The first UHV DC transmission project, YunGuang transmission line would be in rain fed areas, corona performance of conductor line should consider the effect of water drop. To research the effect of water drop on corona performance of UHV DC transmission line, water drop level was defined, a conductor corona performance test system was set up, corona onset voltage was defined, and the corona inception voltage and audible noise level of DC conductor were measured in different water drop level in corona cage. Moreover, the effect of water drop on DC conductor corona performance was observed, and a reference for engineering design of UHV DC transmission line was suggested. Test results show that corona onset voltage rapidly decreases as the water drop level increases; Conductor would sloshing acutely and water drop will be "vaporized" or throw off from conductor after corona onset; Audible noise level of conductor increases as the water drop level increases at the same voltage; however, Audible noise level of conductor decreases with the water drop level increases at its onset voltage.
