The detection of dissolved gases in transformer oil by gas chromatography with helium ionization detector

[摘要] The GC-PDD with the technology of valve cutting and helium ionization detector was used to analyze the dissolved gases in ultra-high voltage(UHV) and extra-high voltage(EHV) transformer oil. The detection limit(DL) reached ppb grade, especially for the featuring gas - C2H2and H2, whose DL could reach 5ppb and 11ppb respectively. The test reproducibility of the instrument was about 1% and the correlation coefficient of standard curve-r is greater or equal to 0.99, which showed obvious advantage compared with normal GC. In addition, the auxiliary gas of H2was not used in this instrument, which completely improved the safety performance. Thus, the application of GC-PDD has significant meaning in warning potential malfunction inside the ultra-high voltage transformer in advance.

[发布机构] State Grid Shanghai Electric Power Research Institute, Shanghai; 200437, China^1;Shanghai Huaai Chromatography Analysis Co. Ltd, Shanghai; 200437, China^2

[效力级别] 无线电电子学

[关键词] Correlation coefficient;Detection limits;Dissolved gas;Extra high voltage;Ionization detectors;Safety performance;Test reproducibility;Ultra high voltage