10 kV配電網內部過電壓研究
王洪授1，鄒偉1，邱建平1，劉渝根2，駱仁意2，馬晉佩2
1 國網重慶潼南縣供電有限責任公司，重慶 402660；2 重慶大學 輸配電裝備及系統安全與新技術國家重點實驗室，重慶 400044
摘 要：針對某變電站10 kV配電網內部過電壓頻發現狀，利用ATP-EMTP計算了投切電容器組、鐵磁諧振的過電壓水平，提出了相應抑制措施。研究表明：切除電容器組過電壓水平高于投電容器組，其兩相重燃過電壓高達3.6 p.u.，建議加避雷器限制；對地電容較小時系統易發生基頻諧振，大于0.2 μF時發生分頻諧振，采用勵磁特性較好的PT能有效抑制鐵磁諧振。
關鍵詞：配電網；內部過電壓；投切電容器；鐵磁諧振
中圖分類號：TM864 文獻標識碼：A 文章編號：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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