With the rapid development of economy, the construction scale of 110 kV substation which is the main power supply of urban power grid is extending. The capacity of the main transformer substation gradually increased from 2 ×40 MVA to 3 ×50 MVA or even larger. In view of the trend, the connection mode of sectionalized single busbar with intermediate transformer can switch to the mode of two section of the bus terminal, which can ensure the power supply of two main transformers at the same time when either of the busbar is out of power. Consequently, the power supply reliability and the power supply capacity can be further improved.%随着经济的快速发展,作为城市电网主力供电电源的110 kV变电站的建设规模也在不断扩大,变电站主变压器容量由2×40 MVA逐步增加至3×50 MVA以至更多.针对这一变化趋势,提出了单母线分段接线+中间变压器可以切换到两段母线的接线方案,该接线型式在任1条母线停电时,能够保证全站2台主变压器同时供电,进一步提高了供电可靠性,提升了供电能力.
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