【摘要】：為了解雷電過電壓從輸電線到變電站的傳播過程以及過電壓的波形特征和影響因素,采用基于兩級(jí)阻容分壓的10 kV電網(wǎng)過電壓在線監(jiān)測(cè)裝置,采集到變電站10 kV母線上雷電過電壓,并對(duì)反擊雷電過電壓波形進(jìn)行了分析。實(shí)測(cè)反擊雷電過電壓波形包含振蕩,并且幅值≤50 kV。利用PSCAD/EMTDC建立傳輸線和變電站的電磁暫態(tài)模型,仿真分析了母線上并聯(lián)饋線、容性設(shè)備,以及避雷器動(dòng)作對(duì)過電壓波形的影響。仿真結(jié)果表明反擊雷電過電壓波形中的短暫上升沿是由絕緣子閃絡(luò)引起。母線上并聯(lián)容性設(shè)備使過電壓振蕩加強(qiáng),并聯(lián)饋線使過電壓波形產(chǎn)生周期性振蕩,并且饋線數(shù)量越多,振蕩周期越短。受避雷器動(dòng)作的影響,母線上反擊雷電過電壓迅速衰減,過電壓波形包含不規(guī)則周期性振蕩,并且過電壓幅值被限制到50 kV。
[Abstract]:In order to understand the propagation process of lightning overvoltage from transmission line to substation as well as the waveform characteristics and influencing factors of over-voltage, a 10 kV on-line monitoring device for over-voltage of power network based on two-stage resistance-capacitance voltage is adopted. Lightning overvoltage on 10 kV busbar of substation is collected and the waveform of counter lightning overvoltage is analyzed. The measured lightning overvoltage waveform contains oscillations, and the amplitude is 鈮，

本文編號(hào)：2338071