3/2接線中斷路器合閘后電流不平衡問題分析
王耀龍
云南電力試驗研究院(集團)有限公司，云南 昆明 650217
摘 要：3/2接線為500kV變電站的主要接線形式。針對某500kV變電站第2串中間的斷路器在合閘運行后該串3組電流互感器(TA)均產生電流不平衡的問題，構建了電路模型并結合實際回路電阻的情況進行了分析，指出產生三相電流不平衡的原因為站內或電源至站內的三相阻抗不平衡所致，針對不平衡電流造成的影響等因素，提出了運維措施和建議。
關鍵詞：3/2接線；斷路器；合閘；電流不平衡
中圖分類號：TM645 文獻標識碼：A 文章編號：1007-3175(2014)08-0054-03
Analysis of Current Imbalance After Circuit Breaker Switching-In of 3/2 Main Wiring
WANG Yao-long
Yunnan Electric Power Research Institute(Group) Co., Ltd, Kunming 650217, China
Abstract: The 3/2 main wiring is the main connection form of 500kV substation. Aiming at the problem that after the circuit breaker in the second string of 500kV substation closing, the three groups current transformers of the string all generated current imbalance, this paper constructed the circuit model and combined with the actual circuit resistance to analyze the causes of three-phase current imbalance from the inside of substation or from the three-phase impedance imbalance between power supply and the inside of substation. According to the influencing factors caused by imbalance current, maintenance measures and recommendations are proposed.
Key words: 3/2 main wiring; circuit breaker; switching-in; current imbalance
