大型电力变压器短路事故统计与分析（Statistics and analysis of short circuit faults of large power transformers）.docVIP

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大型电力变压器短路事故统计与分析（Statistics and analysis of short circuit faults of large power transformers）.doc

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大型电力变压器短路事故统计与分析（Statistics and analysis of short circuit faults of large power transformers）

大型电力变压器短路事故统计与分析（Statistics and analysis of short circuit faults of large power transformers） Statistics and analysis of short circuit accident of large power transformer Wang Mengyun Ling min in 1 The power transformer in the power system, short circuit is trying to avoid people and is not absolutely avoid, especially exports (end) short circuit, over current generated huge mechanical force, great harm to the power transformer. Therefore, the national standard GB1094 and the international standard IEC76 have made the corresponding stipulation to the withstanding short circuit capacity of the power transformer. It requests that the power transformer should be able to withstand all kinds of short circuit accidents in the operation. However, nearly five years of national 110kV and above voltage levels of power transformer accident statistics analysis shows that the leading cause of the accident is not enough to cause a short circuit strength has become a power transformer accident, seriously affecting the safe and reliable operation of power transformer. This is due to external short circuit caused by a statistical analysis of power transformer faults, and proposed to reduce this kind of accidents, tried to promote the improvement of the power transformer factory products and perfect, and promote the operation departments to further improve the operation management level. 2 short circuit accident of large power transformer According to incomplete statistics, 1991~1995 years, the 110kV and above voltage levels of power transformer accident occurred 317 times, the total capacity of the accident is 25348.6MVA. The average accident rate per unit is 0.83%, and the average accident rate of capacity meter is 1.10%. In these accidents due to external damage caused by short circuit of power transformer is 93 times, the capacity of 6677.6MVA, accounting for the same period of 29.3% times the total accidents, accidents accounted for the total capacity of 26.3% (see Table 1). Tab