10 kV配电网内部过电压研究 

王洪授1，邹伟1，邱建平1，刘渝根2，骆仁意2，马晋佩2 
1 国网重庆潼南县供电有限责任公司，重庆 402660；2 重庆大学 输配电装备及系统安全与新技术国家重点实验室，重庆 400044 
 

摘 要：针对某变电站10 kV配电网内部过电压频发现状，利用ATP-EMTP计算了投切电容器组、铁磁谐振的过电压水平，提出了相应抑制措施。研究表明：切除电容器组过电压水平高于投电容器组，其两相重燃过电压高达3.6 p.u.，建议加避雷器限制；对地电容较小时系统易发生基频谐振，大于0.2 μF时发生分频谐振，采用励磁特性较好的PT能有效抑制铁磁谐振。
关键词：配电网；内部过电压；投切电容器；铁磁谐振
中图分类号：TM864 文献标识码：A 文章编号：1007-3175(2015)08-0030-06

Research on Internal Over-Voltage of 10 kV Power Distribution Network 

WANG Hong-shou1, ZOU Wei1, QIU Jian-ping1,LIU Yu-gen2, LUO Ren-yi2, MA Jin-pei2 
1 China Chongqing Tongnan County Power Supply Limited Liability Company, Chongqing 402660, China;2 State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China 
 

Abstract: Aiming at the current situation that the over-voltage took place frequently in certain substation of 10kV power distribution network, this paper used software ATP-EMTP to calculate the over-voltage level of switching capacitor bank and ferroresonance, and proposed the corresponding braking measures. Research shows that when the over-voltage level of turn-off capacitor bank was higher than that of turn-on capacitor bank, its two-phase reburning over-voltage was up to 3.6p.u., so as to adopt arrester limitation; when the earth capacitance was small, the fundamental resonance took place in the system easily and if the capacitance was more than 0.2μF, the fractional frequency resonance took place, so as to adopt the voltage transformer with better excitation characteristics to suppress ferroresonance effectively.
Key words: distribution network; internal over-voltage; switching capacitor; ferroresonance

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