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| 折扣與優(yōu)惠：團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘 要: 復(fù)合絕緣子因其重量輕、機械強度高、耐污閃性能好、運行維護方便等優(yōu)點在電力系統(tǒng)中得到了廣泛應(yīng)用。但復(fù)合絕緣子仍不斷發(fā)生污閃，這與現(xiàn)有的人工污穢試驗僅考慮鹽密的影響不無關(guān)系。因此，本文選擇110kV復(fù)合絕緣子為試品，研究了鹽密(ESDD)和灰密(NSDD)對其污閃特性的影響，并分析了復(fù)合絕緣子的閃絡(luò)過程和閃絡(luò)機理。 本文研究表明：人工污穢試驗中，復(fù)合絕緣子污閃電壓Uf與ESDD和NSDD均相關(guān)，但二者的影響是彼此獨立的。隨著ESDD或NSDD的增加，其Uf均按冪函數(shù)規(guī)律降低，ESDD和NSDD對Uf影響的特征指數(shù)分別為0.135、0.139，即對于復(fù)合絕緣子，灰密的影響大于鹽密，這與瓷絕緣子相反。通過對大量試驗數(shù)據(jù)及試驗結(jié)果的分析，本文得到110kV復(fù)合絕緣子污閃電壓可表示為：。 關(guān)鍵詞：復(fù)合絕緣子；鹽密；灰密；閃絡(luò)；憎水性
ABSTRACT:Composite insulator has advantages of less weight, higher mechanical strength, more excellent anti-contaminated characteristic, easier to maintain. Therefore, the composite insulator is widely used by power utilities in many countries. However, as more and more composite insulators are put into service, there are some problems emerging, the unavoidable reason of flashover on composite insulators when contaminated on surface, I think, it may be related with the pollution test method in which the Non-soluble Deposit Density (NSDD) does not be included. Aimed at the problems of composites in operation, in the paper the AC flashover characteristic of polluted composite insulators under the conditions with different ESDD and NSDD is researched by test. Moreover, the AC flashover mechanism and flashover process of composite insulators under the different polluted level is analyzed. According to the test results carried in the artificial fog chamber, this paper analyzes the effects of the equivalent salt deposit density (ESDD) and the non-soluble deposit density (NSDD) on the flashover performance of the 110kV composite insulator. The result shows that the flashover voltage Uf of the 110kV composite insulators decreases with the increase of both ESDD and NSDD by an power function with a negative index that is 0.135 for ESDD and 0.139 for NSDD, which is opposite with a porcelain insulator. By analyze of test data and experimental results, the formula of flashover voltage of 110kV composite insulator can be expressed as: . Keywords: composite insulator；Equivalent Salt Deposit Density (ESDD)；Non-soluble Deposit Density (NSDD)；flashover；hydrophobicity |
