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Dołączył: 29 Paź 2010
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 Wysłany: Nie 7:51, 12 Gru 2010 Temat postu: moncler doudoune MOA development _1958 |
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Development of MOA
Tower on the river outside the application using this GMOA, run for many years,[link widoczny dla zalogowanych], well outside the string GMOA and protection in an isolated power grid voltage both have good advantages in normal operation, MOA does not bear the voltage, no voltage stress due to take power to the MOR degradation and thermal stability, while reducing the MOA due to the outer surface of the shell cavity and moisture problems caused by pollution. WGMOA long-running voltage (4643h) test shows that the outer surface of the shell by the formation of different levels of pollution will not only cause the conductive layer of the outer surface flashover, more serious harm is caused WGMOA internal fault \, a string of space outside the grid voltage isolation, synthetic insulation case and no electricity aging. Similarly, the external series gap discharge dispersion shortcomings does not work, as long as the value of external series gap discharge setting higher than the grid voltage and over voltage in the operating Insulation coordination to meet the requirements of range of motion. external series gap discharge conduction, MOR plays a limited role continued flow, arc extinguished immediately. external series gap structure may be different depending on the installation location. synthetic insulation shell MOA, can hang in Figure 2 outside of Japan Series GMOA 500kV installation.: servant Sichuan, [i- =---・-----・-- outside a string ------------~ Figure 2500kV GMOA suspension installation, Italy on the use of medium voltage 20kV electricity shown in Figure 3 illustrates the installation method. This installation method, even in the MOA failure occurs, external series gap structure of solid, has always played a protective role. Figure 3 with horn gap arrester 9 Conclusions (1) MOR-J has a very good feature,[link widoczny dla zalogowanych], so that surge arresters reached a new milestone in the development. made by the MOR stack WGMOA, compared with the S & P valve SiC arresters, electrical characteristics are significantly improved,[link widoczny dla zalogowanych], fast response with a steep wave, flow capacity, residual depression and so on. (2) operating experience shows that, WGMOA damage is mainly caused by mains voltage. (3) Over the last decade, domestic and international adoption GMOA, greatly improving the MOA the ability to withstand the grid voltage,[link widoczny dla zalogowanych], but also has a better level of protection references 1ANSI/1EEEC62.11-1987.IEEEStandardforMeta! OxideSurgeArrestersforA.C.PowerCircuits2 Sun Lin Li Ye Li Xuesi. China's technological progress of MOA and development. Insulators and Arresters, 1993 (6) 3 Yin from the tender. power system neutral point indirectly grounded system metal oxide surge arresters without gaps for AC MOA .1994 Symposium Proceedings. the Chinese Society of Electrical Engineering over-voltage and insulation coordination points of the IPCC will compile, 1994 June 4 Joseph Chang Yu States Liangchen Jia Qian rafters. MOA distribution system development and application of .1994 MOA Symposium Proceedings. the Chinese Society of Electrical Engineering with over-voltage and insulation sub special committee compiled Taiwan , June 1994 No. 6 of 1995 (total 148) Insulators and Surge Arresters .7. temperature on multiple column of zinc oxide arrester device the diameter of a single column arrester valve generally unbearable 500kV or 800kV transmission lines operating impact energy , to be more than two columns in parallel. The performance of the valve of the total column are different, so that the long-term increase in operating voltage or wave load arrester released under the load of each column are different, especially when multi-column parallel to the Electric Power Research Institute temperature of the prospective trial. different manufacturers in parallel valve Double Column Double Column temperature 20 ℃, load imbalance in the 0.3 to 20, while the temperature difference between 1S0 ~ 200 ℃ when the small, therefore, more technology can be used in parallel columns, The difference in manufacturing techniques can cause differences in energy absorption of the column should be noted. (From IEEETrans.ONPowerDelivery. a 1995.10.No.3. a 1276 ~ 1284) Artificial pollution turns HVDC Insulator testing by the International Network Conference launched. IEEE cooperation with the United States from Japan, Canada, the United States, Italy, Sweden, Brazil to participate in the six countries the trial chamber, the ordinary type, fog type suspension insulators and post insulators DC Artificial pollution tests conducted. by clean fog method wheel method and salt spray test. The results show that good reproducibility clean fog method, the test procedures have been standardized salt spray test, I can not satisfactory reproducibility of results, still need to standardize the test procedures in order to get a better reproducibility and repeatability. (From IEEETram.. nPowerDelivery. A 1995,10, No.3. a 1438 ~ 1442)
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