發(fā)布時間：2019-05-05 15:12

【摘要】：當前國內(nèi)外缺乏雷電流金屬損傷試驗影響因素的研究,因而采用試驗與理論相結(jié)合的方法研究了雷電流金屬損傷試驗中電極形狀、銅絲引線、試驗距離對試驗結(jié)果的影響。研究結(jié)果表明:模擬首次短時間回擊電流分量、回擊間長持續(xù)時間雷電流分量和末次回擊后的長持續(xù)時間雷電流分量下的金屬損傷試驗中,增大引燃銅絲直徑可加大金屬損傷深度;增加試驗距離會增大模擬雷電流流注發(fā)展區(qū)域半徑,減小電弧單位面積能量,從而使試品損傷面積增大,損傷深度減小;使用尖電極、半橢球電極和半球電極產(chǎn)生的流注初始區(qū)域半徑和發(fā)展區(qū)域半徑依次減小,使用尖電極造成的試品損傷深度和損傷面積最大,其次為半橢球電極和半球電極;相同電極形狀下,減小試驗電極直徑,試品損傷深度增加,損傷面積減小。
[Abstract]:At present, there is no research on the influence factors of lightning current metal damage test at home and abroad. Therefore, the influence of electrode shape, copper wire lead and test distance on the test results in lightning current metal damage test is studied by means of the combination of experiment and theory. The results show that the first short-time lightning current component, the long-duration lightning current component and the metal damage test under the long-duration lightning current component after the last stroke are simulated. The metal damage depth can be increased by increasing the diameter of ignited copper wire. Increasing the test distance will increase the radius of simulated lightning current flow development area and reduce the energy per unit area of arc, which will increase the damage area and decrease the damage depth of the sample. Using pointed electrode, hemispherical electrode and hemispherical electrode, the radius of initial flow region and developing area decreased sequentially, and the damage depth and damage area were the largest when using pointed electrode, followed by hemispherical electrode and hemispherical electrode. Under the same electrode shape, the damage depth of the sample increased and the damage area decreased when the diameter of the test electrode was decreased.
【作者單位】： 上海交通大學電氣工程系;電力傳輸與功率變換控制教育部重點實驗室;中石化股份有限公司青島安全工程研究院化學品安全控制國家重點實驗室;
【基金】：國家自然科學基金(51577117)~~
【分類號】：TG115.5
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本文編號：2469668