GIS断路器动作产生的辐射电场的测量与分析
发布时间：2018-10-15 15:58
【摘要】：随着电力系统的发展,在变电站的改造和建设过程中,GIS变电站(Gas Insulated Substation)凭借其占地面积小、故障率低、维护方便等优越性能,逐步取代了传统敞开式变电站AIS(Air Insulated Substation),但随之也带来了一些问题,引起了电力工作者的广泛关注。由于GIS变电站占地面积小,导致了原本处于控制小室的二次弱电设备被迫移放到了距离一次设备不远的地方,致使二次弱电设备暴露在了比较严重的电磁干扰环境中。此外,开关设备作为变电站电磁干扰的主要干扰源之一,动作产生的辐射场对一次设备的绝缘以及二次弱电设备的正常工作都会造成一定的影响。因此,研究变电站中开关设备操作产生的辐射场的相关规律,不仅有助于变电站的安全运行,更可以从源头上缓解变电站的电磁干扰问题。本文现场测量了不同电压等级GIS中断路器动作产生的辐射电场,对实验数据进行了处理分析,得到了辐射电场的幅值、频率、持续时间等特征量的分布规律,主要工作如下:首先,研制了一套适合于强电磁环境下辐射场测量的光纤测量系统,频带宽为1000Hz～400MHz,测量范围为800V/m～50kV/m,具有良好的前沿特性,可以满足绝大多数环境下辐射场的测量。其次,借助西安高压电器研究所特高压实验室(下文简称西高所)对GIS断路器进行性能检测试验的机会,采用光纤测量系统分别对550kV、1100kVGIS中断路器动作产生的辐射电场进行了现场测量,前后共计测得十余组实验数据。随后,借助MATLAB平台对5组实验数据(3组550kV实验数据、2组1100kV实验数据)进行了时域和频域上的信号处理,以及短时傅里叶变换和小波变换,得到了辐射电场干扰脉冲的特征量分布规律、频谱范围,以及辐射电场频率随时间变化的规律。结果表明:550kVGIS断路器动作产生辐射电场的脉冲幅值最大可达0.13kV/m,频谱范围为几MHz至十几MHz,1100kVGIS断路器动作产生辐射电场的脉冲幅值最大可达0.78kV/m,频谱范围为几十MHz到上百MHz;GIS断路器动作产生的辐射电场频率通常以频段的形式呈现,且高低频频段分离明显:高频频段分散,随时间衰减迅速,持续时间较短;低频频段集中,随时间衰减缓慢,持续时间较长。
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM561
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