【摘要】：高壓開關(guān)柜在電力行業(yè)中具有重要作用,是發(fā)展智能電網(wǎng)的關(guān)鍵一環(huán)。隨著國家對電力行業(yè)的愈發(fā)重視,高壓開關(guān)行業(yè)取得了很好的發(fā)展。傳統(tǒng)高壓開關(guān)柜在電流測量方面采用傳統(tǒng)鐵磁互感器,其測量精度低、頻帶窄,具有磁滯現(xiàn)象等問題,不能滿足智能電網(wǎng)下測量數(shù)字化、實時性的要求,因而需要一種新型的、能夠滿足智能電網(wǎng)要求的電流測量技術(shù)。本文針對高壓開關(guān)柜電流測量,利用磁傳感器電流測量方法,設(shè)計出測量拓撲矩陣,推導(dǎo)了磁傳感器測量數(shù)學(xué)模型以及電流求解矩陣。在此基礎(chǔ)上,設(shè)計電流測量實驗,在0~1200A范圍內(nèi),利用磁傳感器對電流進行測量。通過測量數(shù)據(jù)計算分析,確定性能最好的磁傳感器型號MMLP57H,測量精度可以達到2%。完成了高壓開關(guān)柜母線室的三維數(shù)值模型。利用棱邊單元法計算分析母線電磁場分布,探討了磁場隨母線工作電流、母線相間間距、母線高度的變化規(guī)律。設(shè)計了磁傳感器拓撲結(jié)構(gòu)優(yōu)化實驗。對KYN28-10k V高壓開關(guān)柜進行區(qū)域劃分,對母線內(nèi)部磁場進行逐點測量,利用測量數(shù)據(jù)驗證三維仿真模型的正確性,實現(xiàn)磁傳感器測量拓撲結(jié)構(gòu)優(yōu)化。優(yōu)化后的測量拓撲結(jié)構(gòu)方案為距離母線左邊緣a=30~40mm,距離母線上部h=150~300mm,距離母線表面垂直距離d=10~15cm。利用電流測量實驗對比優(yōu)化前后的電流測量效果,優(yōu)化后的電流測量精度達到1.1%。完成了母線室內(nèi)電磁抗干擾設(shè)計。從磁傳感器PCB板、嵌入式系統(tǒng)屏蔽機箱、母線室屏蔽以及弱電系統(tǒng)走線四個方面進行了電磁抗干擾設(shè)計,提出了解決措施。利用實驗數(shù)據(jù),對比了屏蔽板不同擺放方式對于母線室屏蔽前后的效果,引進了屏蔽效能作為衡量屏蔽效果的重要指標。設(shè)計母線室內(nèi)弱電系統(tǒng)布局走線,采用雙層屏蔽線,避免傳輸信號受到電磁干擾影響。
[Abstract]:High voltage switchgear plays an important role in the power industry and is a key link in the development of smart grid. With the increasing attention of the country to the power industry, the high-voltage switch industry has made a good development. The traditional high voltage switchgear adopts traditional ferromagnetic transformer in current measurement. Its measurement accuracy is low, the frequency band is narrow, and it has the phenomenon of magnetic lag. It can not meet the requirements of digitization and real-time measurement under smart grid, so a new type of measurement is needed. Current measurement technology which can meet the requirements of smart grid. In this paper, aiming at the current measurement of high voltage switchgear, the measurement topological matrix is designed by using the current measurement method of magnetic sensor, and the mathematical model of magnetic sensor measurement and the current solution matrix are derived. On this basis, the current measurement experiment is designed, and the current is measured by magnetic sensor in the range of 0 鈮，

本文編號：2473111