基于PEA的測(cè)試信號(hào)處理的研究現(xiàn)狀
陳勝科，王偉，顧杰鋒，李富平
華北電力大學(xué) 高電壓與電磁兼容北京市重點(diǎn)實(shí)驗(yàn)室，北京 102206
摘 要： 國(guó)內(nèi)外普遍采用電聲脈沖法(PEA) 來(lái)測(cè)量固體電介質(zhì)中空間電荷的分布。但受固體介質(zhì)的聲學(xué)特性和系統(tǒng)頻帶響應(yīng)的影響，所測(cè)信號(hào)的波形會(huì)產(chǎn)生畸變，一方面，信號(hào)幅值產(chǎn)生衰減，波形脈寬展寬；另一方面，信號(hào)產(chǎn)生過(guò)沖，嚴(yán)重影響對(duì)空間電荷形成機(jī)理及分布的判斷。針對(duì)引起波形畸變的兩個(gè)主要因素：介質(zhì)的衰減和色散及測(cè)量系統(tǒng)的頻帶響應(yīng)引起的非線性相位失真和損耗，綜述了國(guó)內(nèi)外關(guān)于不同固體電介質(zhì)形狀的空間電荷波形恢復(fù)的方法，對(duì)比了不同方法的恢復(fù)效果，并指出了基于PEA 的波形恢復(fù)的發(fā)展方向和要求。 關(guān)鍵詞： 空間電荷；電聲脈沖法；衰減；過(guò)沖；波形恢復(fù)
中圖分類(lèi)號(hào)：TM933.23 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2013)09-0001-06
Study on Present Status of Test Signal Processing Based on Pulsed Electro-Acoustic
CHEN Sheng-ke, WANG Wei, GU Jie-feng, LI Fu-ping
Beijing Key Laboratory of High Voltage & EMC, North China Electric Power University, Beijing 102206, China
Abstract: Both at home and abroad, the pulsed electro-acoustic (PEA) method is commonly adopted to measure the space charge distribution in dielectrics, but the measured signal waveforms will generate distortion because of the impact of acoustic characteristics of solid dielectrics and the system band response. On the one hand, signal amplitude attenuates and pulse width broadens; on the other hand, the signal generates overshooting, which severely affects the judgement of formation mechanism and distribution of space charge. In allusion to the two main factors of dielectric attenuation and dispersion causing waveforms distortion, the nonlinear phase distortion and loss caused by system band response were measured. This paper described the space charge waveforms recovery method of different solid dielectrics shape at home and abroad and compared the recovery effects, pointing out the development direction and requirements of waveforms recovery based on PEA.
Key words: space charge; pulsed electro-acoustic (PEA); attenuation; overshoot; waveform recovery
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