本文選題：局部放電 + GIS��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：局部放電是引起電力設(shè)備產(chǎn)生故障的主要原因之一,局部放電加速了絕緣材料的老化,嚴(yán)重影響電力系統(tǒng)的正常運(yùn)行。針對不同GIS結(jié)構(gòu)局部放電產(chǎn)生電磁波的頻譜分布特征,設(shè)計(jì)了三個(gè)不同工作頻率段的特高頻天線,用于檢測局部放電電磁波信號的泄漏。采用系統(tǒng)仿真軟件建立模型仿真,并根據(jù)仿真模型的結(jié)構(gòu)尺寸制作實(shí)物,最后實(shí)際測試天線的基本性能,結(jié)果表明:設(shè)計(jì)的天線滿足局部放電檢測天線的參數(shù)指標(biāo)。論文主要包含的內(nèi)容如下:1.介紹局部放電的產(chǎn)生機(jī)理和研究背景,闡述現(xiàn)階段檢測局部放電所用的方法及檢測天線的發(fā)展趨勢。針對特高頻天線在局部放電檢測中的應(yīng)用,結(jié)合實(shí)際中GIS結(jié)構(gòu),建立相應(yīng)的等效模型,利用電磁仿真軟件Ansoft HFSS,得到局部放電電磁波信號在不同尺寸縫隙泄漏處的電場輻射分布特征。2.針對GIS波導(dǎo)中縫隙泄漏局部放電信號的輻射頻譜的分布特征,基于蝶形天線的結(jié)構(gòu)及基本性能參數(shù)的分析,設(shè)計(jì)了特高頻寬頻帶蝶形微帶天線,通過進(jìn)一步縮小尺寸得到半圓形天線,最后利用開槽的結(jié)構(gòu)形式及阻抗轉(zhuǎn)換達(dá)到天線的小型化和超寬帶要求。通過仿真優(yōu)化使得三個(gè)天線的工作頻段均與局部放電特高頻信號分布頻段一致,仿真結(jié)果表明天線的基本參數(shù)滿足局部放電檢測的要求。3.使用矢量網(wǎng)絡(luò)分析儀對所制作的蝶形天線、半圓形天線、開槽天線的基本參數(shù)進(jìn)行測量,測量參數(shù)包括有回波損耗、駐波比、特征阻抗圓圖,實(shí)際測量結(jié)果與仿真結(jié)果一致,這三個(gè)天線在其工作頻段內(nèi)阻抗匹配,增益高,頻率覆蓋范圍廣,滿足局部放電檢測天線的設(shè)計(jì)要求。
[Abstract]:Partial discharge (PD) is one of the main causes of power equipment failure. Partial discharge accelerates the aging of insulating materials and seriously affects the normal operation of power system. Aiming at the spectrum distribution characteristics of electromagnetic wave generated by partial discharge in different GIS structures, three UHF antennas with different operating frequencies are designed to detect the leakage of partial discharge electromagnetic wave signal. The system simulation software is used to establish the model simulation, and the material object is made according to the structure size of the simulation model. Finally, the basic performance of the antenna is tested. The results show that the designed antenna meets the parameters of PD detection antenna. The main contents of this paper are as follows: 1. The generation mechanism and research background of partial discharge are introduced. The methods used to detect partial discharge and the development trend of detection antenna are described. Aiming at the application of UHF antenna in PD detection, the equivalent model of UHF antenna is established in combination with GIS structure in practice. By using the electromagnetic simulation software Ansoft HFSS, the characteristics of electric field radiation distribution of PD electromagnetic wave signal at the leak site of different sizes are obtained. Based on the analysis of the structure and basic performance parameters of the butterfly antenna, an UHF wideband butterfly microstrip antenna is designed for the distribution of the radiation spectrum of the slot leakage partial discharge signal in GIS waveguides, based on the analysis of the structure and basic performance parameters of the butterfly antenna. The semicircular antenna is obtained by further reducing the size of the antenna. Finally, the slotted structure and impedance conversion are used to meet the requirements of miniaturization and ultra-wideband (UWB) of the antenna. The simulation results show that the operating frequency bands of the three antennas are consistent with the UHF signal distribution band of PD. The simulation results show that the basic parameters of the antenna meet the requirements of PD detection. The basic parameters of butterfly antenna, semicircle antenna and slot antenna are measured by using vector network analyzer. The measured parameters include echo loss, standing wave ratio, characteristic impedance circle diagram, and the actual measurement results are consistent with the simulation results. The three antennas have high gain and wide frequency coverage due to their impedance matching in their operating band, which can meet the design requirements of PD detection antennas.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN822

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 王鐵軍;基于局部放電的超高頻寬帶天線優(yōu)化設(shè)計(jì)[D];西安電子科技大學(xué);2011年

，

本文編號：2039939