GIS斷路器動作產(chǎn)生的輻射電場的測量與分析
發(fā)布時間：2018-10-15 15:58
【摘要】：隨著電力系統(tǒng)的發(fā)展,在變電站的改造和建設(shè)過程中,GIS變電站(Gas Insulated Substation)憑借其占地面積小、故障率低、維護方便等優(yōu)越性能,逐步取代了傳統(tǒng)敞開式變電站AIS(Air Insulated Substation),但隨之也帶來了一些問題,引起了電力工作者的廣泛關(guān)注。由于GIS變電站占地面積小,導(dǎo)致了原本處于控制小室的二次弱電設(shè)備被迫移放到了距離一次設(shè)備不遠的地方,致使二次弱電設(shè)備暴露在了比較嚴重的電磁干擾環(huán)境中。此外,開關(guān)設(shè)備作為變電站電磁干擾的主要干擾源之一,動作產(chǎn)生的輻射場對一次設(shè)備的絕緣以及二次弱電設(shè)備的正常工作都會造成一定的影響。因此,研究變電站中開關(guān)設(shè)備操作產(chǎn)生的輻射場的相關(guān)規(guī)律,不僅有助于變電站的安全運行,更可以從源頭上緩解變電站的電磁干擾問題。本文現(xiàn)場測量了不同電壓等級GIS中斷路器動作產(chǎn)生的輻射電場,對實驗數(shù)據(jù)進行了處理分析,得到了輻射電場的幅值、頻率、持續(xù)時間等特征量的分布規(guī)律,主要工作如下:首先,研制了一套適合于強電磁環(huán)境下輻射場測量的光纖測量系統(tǒng),頻帶寬為1000Hz～400MHz,測量范圍為800V/m～50kV/m,具有良好的前沿特性,可以滿足絕大多數(shù)環(huán)境下輻射場的測量。其次,借助西安高壓電器研究所特高壓實驗室(下文簡稱西高所)對GIS斷路器進行性能檢測試驗的機會,采用光纖測量系統(tǒng)分別對550kV、1100kVGIS中斷路器動作產(chǎn)生的輻射電場進行了現(xiàn)場測量,前后共計測得十余組實驗數(shù)據(jù)。隨后,借助MATLAB平臺對5組實驗數(shù)據(jù)(3組550kV實驗數(shù)據(jù)、2組1100kV實驗數(shù)據(jù))進行了時域和頻域上的信號處理,以及短時傅里葉變換和小波變換,得到了輻射電場干擾脈沖的特征量分布規(guī)律、頻譜范圍,以及輻射電場頻率隨時間變化的規(guī)律。結(jié)果表明:550kVGIS斷路器動作產(chǎn)生輻射電場的脈沖幅值最大可達0.13kV/m,頻譜范圍為幾MHz至十幾MHz,1100kVGIS斷路器動作產(chǎn)生輻射電場的脈沖幅值最大可達0.78kV/m,頻譜范圍為幾十MHz到上百MHz;GIS斷路器動作產(chǎn)生的輻射電場頻率通常以頻段的形式呈現(xiàn),且高低頻頻段分離明顯:高頻頻段分散,隨時間衰減迅速,持續(xù)時間較短;低頻頻段集中,隨時間衰減緩慢,持續(xù)時間較長。
[Abstract]:With the development of power system, in the process of transformation and construction of substation, GIS substation (Gas Insulated Substation) has the advantages of small area, low failure rate, convenient maintenance and so on. It has gradually replaced the traditional open substation AIS (Air Insulated Substation), but it has brought some problems, which has attracted the attention of power workers. Due to the small area of GIS substation, the secondary weak current equipment which was originally in the control chamber was forced to move to a place not far from the primary equipment, and the secondary weak current equipment was exposed to the more serious electromagnetic interference environment. In addition, as one of the main interference sources of substation electromagnetic interference, the radiation field generated by the operation will have a certain impact on the insulation of the primary equipment and the normal operation of the secondary weak current equipment. Therefore, studying the relevant rules of radiation field caused by switching equipment operation in substation is not only helpful to the safe operation of substation, but also can alleviate the electromagnetic interference problem of substation from source. In this paper, the radiation electric field produced by the circuit breaker action in GIS with different voltage levels is measured, and the experimental data are processed and analyzed. The distribution rules of the amplitude, frequency and duration of the radiation electric field are obtained. The main work is as follows: firstly, an optical fiber measurement system suitable for radiation field measurement in strong electromagnetic environment has been developed. The bandwidth is 1000 Hz / s 400 MHz, and the measurement range is 800 V / m / m ~ (50 kV / m). It can satisfy the measurement of radiation field in most environments. Secondly, with the help of the ultra-high voltage laboratory of Xi'an Institute of High Voltage Electrical Appliances (hereafter referred to as Xigao Institute), we have the opportunity to test the performance of GIS circuit breakers. In this paper, the radiation electric field generated by circuit breaker operation in 550 kV / 1100kV GIS was measured by optical fiber measurement system. More than ten groups of experimental data were measured before and after the measurement. Then, five groups of experimental data (three groups of 550kV experimental data and two groups of 1100kV experimental data) were processed in time domain and frequency domain with the help of MATLAB platform, as well as short time Fourier transform and wavelet transform. The distribution law of the characteristic quantity, the spectrum range and the variation of the frequency of the radiation electric field with time are obtained. The results show that the maximum amplitude of the radiation electric field generated by the operation of 550kVGIS circuit breaker is 0.13kV / m, the frequency spectrum ranges from several MHz to more than ten MHz,1100kVGIS circuit breakers, and the maximum amplitude of the radiation electric field generated by the operation of the MHz,1100kVGIS circuit breaker is 0.78 kV / m, and the spectrum range is tens of MHz to hundreds of MHz;GIS. The frequency of the radiation electric field generated by the operation of the circuit breaker is usually presented in the form of a frequency band. The separation of high and low frequency bands is obvious: the high frequency band is dispersed, the attenuation is rapid with time, the duration is shorter, the low frequency band is concentrated, the attenuation is slow with time, and the duration is longer.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM561
[Abstract]:With the development of power system, in the process of transformation and construction of substation, GIS substation (Gas Insulated Substation) has the advantages of small area, low failure rate, convenient maintenance and so on. It has gradually replaced the traditional open substation AIS (Air Insulated Substation), but it has brought some problems, which has attracted the attention of power workers. Due to the small area of GIS substation, the secondary weak current equipment which was originally in the control chamber was forced to move to a place not far from the primary equipment, and the secondary weak current equipment was exposed to the more serious electromagnetic interference environment. In addition, as one of the main interference sources of substation electromagnetic interference, the radiation field generated by the operation will have a certain impact on the insulation of the primary equipment and the normal operation of the secondary weak current equipment. Therefore, studying the relevant rules of radiation field caused by switching equipment operation in substation is not only helpful to the safe operation of substation, but also can alleviate the electromagnetic interference problem of substation from source. In this paper, the radiation electric field produced by the circuit breaker action in GIS with different voltage levels is measured, and the experimental data are processed and analyzed. The distribution rules of the amplitude, frequency and duration of the radiation electric field are obtained. The main work is as follows: firstly, an optical fiber measurement system suitable for radiation field measurement in strong electromagnetic environment has been developed. The bandwidth is 1000 Hz / s 400 MHz, and the measurement range is 800 V / m / m ~ (50 kV / m). It can satisfy the measurement of radiation field in most environments. Secondly, with the help of the ultra-high voltage laboratory of Xi'an Institute of High Voltage Electrical Appliances (hereafter referred to as Xigao Institute), we have the opportunity to test the performance of GIS circuit breakers. In this paper, the radiation electric field generated by circuit breaker operation in 550 kV / 1100kV GIS was measured by optical fiber measurement system. More than ten groups of experimental data were measured before and after the measurement. Then, five groups of experimental data (three groups of 550kV experimental data and two groups of 1100kV experimental data) were processed in time domain and frequency domain with the help of MATLAB platform, as well as short time Fourier transform and wavelet transform. The distribution law of the characteristic quantity, the spectrum range and the variation of the frequency of the radiation electric field with time are obtained. The results show that the maximum amplitude of the radiation electric field generated by the operation of 550kVGIS circuit breaker is 0.13kV / m, the frequency spectrum ranges from several MHz to more than ten MHz,1100kVGIS circuit breakers, and the maximum amplitude of the radiation electric field generated by the operation of the MHz,1100kVGIS circuit breaker is 0.78 kV / m, and the spectrum range is tens of MHz to hundreds of MHz;GIS. The frequency of the radiation electric field generated by the operation of the circuit breaker is usually presented in the form of a frequency band. The separation of high and low frequency bands is obvious: the high frequency band is dispersed, the attenuation is rapid with time, the duration is shorter, the low frequency band is concentrated, the attenuation is slow with time, and the duration is longer.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM561
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