Statistical Analysis of 220kV Operating Transformer Chromatographic Test Data

In this paper, the distribution law and 95% quantile value of each gas content are analyzed based on the chromatographic test data of 220 kV operating transformer in Guangzhou power grid. It is obtained that H2, C2H6, C2H4 and total hydrocarbons all obey the approximate lognormal distribution, CH4, CO and CO2 obey the approximate weibull distribution, and the 95% quantile values of H2, CH4, C2H6, C2H4, CO, CO2and total hydrocarbons are 39.1uL/L, 34.8uL/L, 18.4uL/L, 22.2uL/L, 1092uL/L, 5964uL/L and 73uL/L respectively. By analyzing the influence of operating years, it is found that alkane gases, CO and CO2 increase with the increase of operating years, while H2 shows the opposite law.