Institute, Changchun, Jilin 13002, 4 Jilin University School of Basic Medicine, Jilin Changchun 12 Revised Date: 2009: Chen Yun (957-) male deputy chief physician, mainly engaged in occupational health protection and supervision.
Corresponding author, professor.
(VC), forced vital capacity (FVC), calculation of forced vital capacity in the first second) and terminal flow rate (fef73%). The mean value of the above indicators decreased with the increase of contact time, and the abnormal rate increased with contact time. There was a trend of increase, and the difference was statistically significant compared with the control group. It is suggested that the gas after exposure to the sulfur hexafluoride electrical equipment has a certain influence on the lung ventilation function of the workers.
14: B sulfur hexafluoride (SF6) is a gas material, which is a negatively charged, colorless, odorless, non-toxic inert gas with good chemical stability, insulation and arc extinguishing properties, and has no oxidation. And the advantages of strong electric strength, etc., are widely used in electrical equipment. The relative density of sulfur hexafluoride gas is 6.16. It can be collected in the lower layer of air after being dissipated from the electrical switch. It is difficult to dilute and diffuse. 12.SF6 gas itself is non-toxic and is a simple ventricular gas, but it is connected in the electrical switch. At the moment of high-voltage current, under the high temperature of the arc, a variety of fluorides, such as HFSF4sf2, SF., etc., can be decomposed, and these decomposed fluorides have different degrees of toxic effects on the respiratory tract. To this end, we observed the lung function of the sulphur hexafluoride electrical switch operator in the substation.
1 Objects and methods 1.1 Object observation group selected substation engaged in sulphur hexafluoride electrical equipment operation and testing personnel, no smoking history of 53 people, aged 28 to 53 years, mean age 385 years. According to the contact age group, 1 group of workers > 5 years, 13 people; 1 group of workers 5 to 9 years, 25 people; 111 groups of workers > 10 years, 15 people. In the control group, 47 workers without smoking history who were not exposed to sulphur hexafluoride in the substation were selected, aged 26-52 years, with an average age of 378 years; all were male.
1.2 Determination method using Shanghai-made F-80 single-tube spirometer, according to the conventional method, take the standing position, sequential determination of vital capacity (VC) and forced vital capacity (FVC) according to the forced vital capacity (FVC) to calculate the first second forced vital capacity (FEV) The ratio of the occupational vital capacity (FEV%) and the maximum expiratory flow rate (FEF 23% 75%) of the vital capacity as a percentage of the predicted value (VC%) and the first second forced expiratory volume as a percentage of the predicted value (FEV%) ) and FEV/FVC% abnormal rate, forced exhalation in the middle and final flow rate abnormal rate.
2 Results The data of each group were normally distributed by the homogeneity test of variance, and the difference data of 4 groups of data were tested. The difference between the four groups of observation groups and the control group was statistically significant (P<0.01) by NemnKeuS method. The difference between the mean of each group was significantly tested. There was no significant difference between the control group, the first group and the U group (P>005). There was a difference between the control group, the 1,1丨 group and the 1 group. Statistical significance (P<0.01) See Table 1 for the results of the mi group control group 1 compared with the control group and 1, group, P <0.01 22 indicators abnormal rate comparison according to diagnostic criteria, 4 groups of data with RXC The chi-square test was performed for statistical analysis. The difference between VCFEV, FEV/FVCFEF 23%, and FEF% 83% abnormality was statistically significant between the observation group and the control group (P<0.01). Then the results were compared. The results were VCFEV, FEV. There was no difference between the control group, group 1 and group I (P>0.05), but the difference between the control group, group 1, group I and group 1 was statistically significant (P<0.01) FEF5%, fef There was no difference between the %3% abnormal rate group 1, the I group and the 1 group, but the difference between the control group and the 1 group, the I group and the 111 group was statistically significant ( P<0.01)3 Discussion Sulfur hexafluoride is used as an insulating medium in high-voltage electrical equipment such as transformers and high-voltage electrical switches. Although it is a harmless inert gas, it can be decomposed under the action of high-voltage arc high temperature. Fluoride, such as sulfur oxysulfide, sulfur sulphide, sulfur tetrafluoride and other decomposition products, such substances have a strong stimulating effect. 14. Although these decomposition products are usually sealed in high-voltage electrical switches, but in the accident It may escape during maintenance and cause harm to the contact person. Poisoning accidents caused by exposure to sulphur hexafluoride decomposition have been reported. Workers with poisoning may have difficulty breathing, headache, dizziness, hemoptysis, etc. X-ray examination reveals abnormal changes in lung texture.
85% abnormal number abnormal rate abnormal number abnormal rate abnormal number abnormal number abnormal rate abnormal number abnormal rate abnormal number abnormal number abnormal rate control group 4736. The test results show that VCFEV, FEV/FVCFEF23%75%, ff75% in contact with sulphur hexafluoride There have been significant changes in people over 10 years, especially FEFfFEF% has significant changes in the early stages of exposure. The reason may be that sulphur hexafluoride decomposition products enter the lungs with respiration, chemical reaction with the respiratory mucosa and the surface of the alveolar surface, causing respiratory mucosal and alveolar damage, and sulphur hexafluoride decomposition products can be deposited in the deep respiratory tract to cause small airways. Destruction, injury, or fibrosis affects the ventilatory function of the lungs, and the lung ventilatory function can be significantly altered with prolonged contact time. This survey shows that sulphur hexafluoride does have a certain impact on the lung ventilation function of the exposed personnel, especially the small airway ventilatory function changes. Fef%% and fef%% can be used as indicators for determining the early effects of sulfur hexafluoride decomposition on lung ventilation.
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