基于FTIR的不同运行条件对复合绝缘子老化特性的影响研究

为研究现场运行复合绝缘子伞裙在不同条件下的老化状态,利用傅里叶变换红外光谱(fourier transform infrared spectroscopy,FTIR)和硬度测试方法,分析同一厂家生产的运行于不同位置不同运行年限的多支复合绝缘子的老化特性,同时对不同电压等级的复合绝缘子进行电场分布仿真。硬度测试结果表明:处于高压端部的伞裙其上下表面的硬度都随着电压等级的提高而增加,而处于绝缘子中部的伞裙,其表面硬度则随着电压等级的升高而减小。同时发现,同一电压等级的复合绝缘子随着运行年限的增加,伞裙上下表面硬度逐渐增加。FTIR测试结果表明:对于伞裙上表面,Si-O-Si主键吸收峰随着运行年限的增加下降越严重,而下表面试样并未呈现出明确的规律性。硅橡胶复合绝缘子伞裙所处电场强度越高,FTIR红外光谱Si-O-Si和Si-CH3官能团对应特征峰下降程度就越大;对不同相别的复合绝缘子而言,B相伞裙各特征官能团对应的特征峰下降程度最小,说明B相较A、C两相老化最轻。

Influence of Different Operating Conditions on Aging Characteristics of Composite Insulators Based on FTIR

In order to study the aging condition of composite insulator under different conditions,Fourier transform infrared spectroscopy(FTIR)and hardness testing method are used to analyze the aging conditions of samples operating different years and in the different positions from the same manufacturer.Meanwhile,the electric field distributions of composite insulators with different voltage levels are simulated.The hardness results show that the hardness of the upper and lower shed surfaces are increased with the voltage level,while the surface hardness of the shed in the middle part decreases with the voltage level.It is found that the hardness of the upper and lower shed surface with the same voltage level increased with the service life.FTIR test shows that the absorption peak of Si-O-Si decreased with the service life,the lower surface sample doesn’t show a clear regularity.The FTIR infrared spectrum characteristic peaks of the Si-O-Si and Si-CH3 functional group decreases with the increase of electric field strength of the silicone rubber composite insulator shed.For the composite insulators with different phases show that the absorption peak of the B-phase shed had the lowest degree of decrease,which indicates that the aging of B phase is the lightest than that of A and C phase.