Materials Performance

DEC 2014

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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64 DECEMBER 2014 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 53, NO. 12 MATERIALS SELECTION & DESIGN A Air pollution has destructive effects on power pole insulators and electri- cal fttings. Usually, ferrous electrical fttings on power distribution poles are galvanized. Unfortunately, in highly polluted atmospheres, galvanized lay- ers have a limited lifetime. This article presents some of the destructive ef- fects of air pollution on electrical ft- tings and explains strategies to coun- ter the resulting corrosion. Air pollution creates destructive effects on power di stribution syst ems. It can decrease the durability of concrete power poles, 13 and also cause corrosion of electri cal fittings such as power line clamps and metal cross arms, which allows electrical current creep across insulator surfaces. In some cases, the effects of air pollution have caused electrical power outages; destroyed insulators; increased the occurrence of fault currents; and released power lines from their clamps, permitting power lines to fall to the ground. Isfahan, one of the largest cities in Iran, has a high level of air pollution caused by brick furnaces, and industrial and waste water facilities. Air pollution is higher in two suburbs, Dolatabad and Habibabad, than in other parts of the city, and many serious power line problems there have been caused by air pollution. In several Iranian cities, there are spe cial devices for measuring air pollution. Isfah an h a s th e se d e v i c e s, w hi ch are located in various areas of the city. They measure the air quality index (AQI) by first determining the average concentration of air pollutants per hour, including sulfur dioxi d e (S O 2 ), nitrogen dioxi d e (NO 2 ), ozone (O 3 ), and carbon monoxide (CO), and the average concentration of solid particles suspended in the air (in a 24h period) with a size of <2.5 µm (PM 2.5 ) and <10 µm (PM 10 ). Then the device automatically converts the measurements into the AQI, which has six levels: 050 (excellent), 51100 (good), 101 150 (lightly polluted), 151200 (moderately polluted), 201300 (heavily polluted), and >300 (severely polluted). Figure 1 shows a typical air pollution measurement device used in Isfahan. Effects of Highly Polluted Atmospheres on Power Distribution Systems a. aghajani, Subsea R&D Center of Isfahan University of Technology, Isfahan, Iran m. Urgen, Istanbul Technical University, Istanbul, Turkey FIGURE 1 A typical air pollution measurement device used in Isfahan.

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