A lot of observation and reports in the world indicated that flashover voltage of insulator covered with snow or ice descended obviously 國內(nèi)外大量試驗(yàn)觀察和報(bào)告表明,冰雪條件下絕緣子的閃絡(luò)電壓明顯下降,對(duì)電力系統(tǒng)危害極大。
So there is important implication value and academic value to systemic investigation of the effect of the existence of air gap to the flashover voltage along the ice - covered insulators 因此,深入、系統(tǒng)的研究空氣間隙中的放電活動(dòng)對(duì)絕緣子串閃絡(luò)電壓的影響有著重要的工程應(yīng)用價(jià)值和學(xué)術(shù)意義。
On basis of the analysis of the flashover processes in three kinds of icing states , it gives out the flashover mechanism of icing composite insulators and points out the minimum icing flashover voltage is related to the icing states 2 )通過對(duì)覆冰絕緣子三種覆冰狀態(tài)下閃絡(luò)過程的分析,提出了覆冰合成絕緣子的閃絡(luò)機(jī)理,并得到合成絕緣子的閃絡(luò)電壓與覆冰狀態(tài)有關(guān)。
The main tests and researches are as following : to study the ac flashover characteristic of composite insulator in different icing states by imitating tests in multifunctional artificial climate chamber , and analyze the effect of ice amount and icing water conductivity on flashover voltage , put forward a flashover mechanism by analyzing the icing flashover process . to study the ac flashover characteristic of composite insulator in different altitude and icing states together by imitating tests in multifunctional artificial climate chamber , and mainly analyze the effect of altitude ( air pressure ) and ice amount on flashover voltage , and investigate the flashover mechanism . to investigate the effect of high altitude and icing on the hydrophobicity of composite insulators 本文主要進(jìn)行了以下試驗(yàn)研究: 1 )在多功能人工氣候室里模擬不同覆冰程度下合成絕緣子的交流閃絡(luò)特性,主要分析覆冰量和覆冰水電導(dǎo)率對(duì)閃絡(luò)電壓的影響,并對(duì)其覆冰閃絡(luò)過程進(jìn)行機(jī)理分析; 2 )在多功能人工氣候室里模擬不同海拔高度和覆冰程度綜合作用下合成絕緣子的交流閃絡(luò)特性,主要分析海拔高度(即氣壓)和覆冰量對(duì)閃絡(luò)電壓的影響,并進(jìn)行閃絡(luò)機(jī)理分析; 3 )研究高海拔和覆冰對(duì)合成絕緣子憎水性的影響。
The study results show that the minimum ac flashover voltage decreases with the increase of the ice amount accreted on the insulator surface by an exponential law , and the down - trend of the minimum ac flashover voltage will slow gradually with the bridging of the shed of the insulators by icicles , both the average saturated ice amount and the special exponent m of effect of ice amount for different insulators depend on the radius of shed and the air - gaps of the sheds of the insulators , and that the ac ice flashover voltage decrease with the decrease pressure ratio p / p0 ( rise of the altitude ) by power - law for different esdd and icing - states when the altitude is from 4000m to 5500m . the special exponent n , which show the effects of altitude on the flashover voltage , is various with the type of insulator , icing - states and the surface status of iced insulator etc . , and that the minimum ac flashover voltage of iced insulators decreases by power - law with esdd or the freezing water conductivity for different ice amount and atmospheric 研究結(jié)果表明:在不同海拔高度和等值鹽密esdd下,絕緣子的最低交流冰閃電壓均隨覆冰量的增加而呈指數(shù)規(guī)律降低;當(dāng)覆冰量增加到一定程度后,最低交流冰閃電壓隨覆冰量增加而降低的趨勢(shì)趨于飽和;不同絕緣子串的平均飽和覆冰量及閃絡(luò)電壓的覆冰量影響特征指數(shù)m均與絕緣子的盤徑和傘距等因素有關(guān);在海拔4000 5500m之間,不同等值鹽密esdd和覆冰狀態(tài)下,絕緣子的交流冰閃電壓隨海拔高度的增加(氣壓的降低)與p / p0呈乘冪關(guān)系降低,氣壓影響特征指數(shù)n與絕緣子類型、覆冰類型、覆冰表面狀況等因素有關(guān);當(dāng)覆冰量和氣壓一定時(shí),絕緣子的最低冰閃電壓均隨著等值鹽密( esdd )或覆冰水電導(dǎo)率的增加而呈乘冪關(guān)系降低,并逐漸趨于飽和。
flashover voltageとは意味:フラッシュオーバー電圧{でんあつ} flashover voltage meaning:[Electronics] 1. The peak voltage at which FLASHOVER occurs. 2. The voltage at which disruptive discharge occurs between electrodes and across the surface of an insulating material. flashover voltage перевод:1. поверхностное пробивное напряжение 2. напряжение разрушающего пробоя