本文關鍵詞： 動態(tài)增容 導線溫度場 導線載流量 ANSYS仿真 徑向溫度分布　出處：《鄭州大學》2017年碩士論文　論文類型：學位論文

【摘要】：近年來,為了滿足日益增加的用電需求,輸電線路的增容技術也得到了越來越廣泛的研究和應用,但是,由此帶來的導線長期高溫工作條件逐漸成為影響線路運行安全性和可靠性的一個不容忽視的因素。目前,已有的動態(tài)增容技術,主要著眼于無線通信技術在導線表面溫度的實時監(jiān)測方面的應用,對于導線本身的工作溫度場的形成原因和分布特點以及影響因素(風速、風向、環(huán)境溫度、日照強度等)研究相對不足。而這些對于準確確定導線的溫度及其載流量有重要影響,因此值得深入研究�；诖�,本文以LGJ300/50為例,研究其在風速、風向、環(huán)境溫度、日照強度等影響下的溫度分布規(guī)律,以期為輸電線路動態(tài)增容技術提供理論支撐,也為后期導線在工作條件下的材性和疲勞分析提供參考。本文的主要研究內容和結論如下:(1)以IEEE規(guī)范為例,詳細介紹了導線的熱平衡方程以及對流散熱量、輻射散熱量、日照生熱量、電阻的計算方法,為有限元數(shù)值模擬提供可靠依據(jù);(2)利用ANSYS軟件建立均質導線模型(不考慮空氣間隙),驗證了ANSYS仿真法的準確性并明確了風速、風向、環(huán)境溫度、日照強度等對導線整體溫度變化情況的影響規(guī)律,為后續(xù)分析提供可靠支持;(3)利用ANSYS軟件建立精細導線模型(考慮導線內空氣間隙對熱傳導的影響及股線間的實際接觸情況),驗證了其分析導線徑向溫度分布規(guī)律的準確性;研究得出,載流量在410A~860A范圍內,隨著風速、風向角、環(huán)境溫度、日照強度等的變化,導線徑向溫差在4~10℃變化,該溫差對載流量的影響可達70A~80A;而現(xiàn)有的溫度監(jiān)測裝置,所測量導線的溫度多是導線的表面溫度,以此來調整線路的輸送容量則是偏于不安全的,結合現(xiàn)有的實時增容技術,可以通過ANSYS分析導線相應環(huán)境條件下的溫度場,從而根據(jù)導線內的各點溫度分布,計算最不利位置的導線允許載流量,在保證線路運行安全的基礎上提高線路輸送容量;(4)結合溫度場的分析結果以及《IEEE規(guī)范》,對架空導線的載流量進行分析,可知風速、風向角、環(huán)境溫度、日照強度對導線載流量的影響程度由大到小。最后,本文提出了導線徑向溫差對導線應力分析的影響,以及溫度熱影響區(qū)對多分裂導線溫度場分析的影響,對后續(xù)工作進行了展望。
[Abstract]:In recent years, in order to meet the increasing demand for electricity, the capacitive technology of transmission lines has been more and more widely studied and applied, but. The long term high temperature working conditions of conductors have gradually become a factor that can not be ignored to affect the safety and reliability of line operation. At present, the existing dynamic compatibilization technology has been developed. This paper focuses on the application of wireless communication technology in the real-time monitoring of wire surface temperature, the formation reasons and distribution characteristics of the wire's working temperature field and the influencing factors (wind speed, wind direction, ambient temperature). The study of sunshine intensity is relatively insufficient, and these have important influence on determining the temperature and carrier flux of wire accurately, so it is worth further study. Based on this, this paper takes LGJ300/50 as an example. The temperature distribution under the influence of wind speed, wind direction, ambient temperature, sunshine intensity and so on is studied in order to provide theoretical support for power transmission line dynamic compatibilization technology. The main contents and conclusions of this paper are as follows: (1) take IEEE Code as an example. The heat balance equation of the conductor and the calculation methods of convection heat dissipation, radiation heat dissipation, sunshine heat generation and resistance are introduced in detail, which provides a reliable basis for the finite element numerical simulation. (2) using ANSYS software to establish homogeneous conductor model (not considering air gap), the accuracy of ANSYS simulation method is verified and the wind speed, wind direction and ambient temperature are determined. The influence of sunshine intensity on the overall temperature change of the conductor provides reliable support for the subsequent analysis. (3) the fine traverse model is established by using ANSYS software (considering the influence of air gap on heat conduction and the actual contact between strands). The accuracy of the radial temperature distribution analysis is verified. The results show that the radial temperature difference of conductors varies at 410 鈩，

本文編號：1479973