TRICONEX DI3301 
 TRICONEX DI3301 
 TRICONEX DI3301 
變電所TV電壓經常出現不平衡。往往把電壓不平衡總認為是一次系統接地。若并非一次接地，便可能在查找時，分、合斷路器造成對用戶的短時停電，另一方面也可能因為未能及時找到接地點，而引起事故擴大。
1　一般情況下電壓不平衡的分析
　　(1)　中性點不接地系統電壓不平衡，可能是由于熔絲熔斷而造成，即高壓熔絲熔斷，熔斷相電壓降低，由于TV還會有一定的感應電壓，所以其電壓并不為零而其余兩相為正常電壓，其向量角為120°，同時由于斷相造成三相電壓不平衡，故開口三角形處也會產生不平衡電壓，即有零序電壓，如：C相高壓熔絲熔斷，零序電壓大約為33V左右，故能起動接地裝置，發出接地信號。
　　二次側熔絲熔斷時，與一次側熔絲之不同在于：一次側三相電壓仍平衡，故開口三角形開口處沒有電壓，因而不會發出接地信號，其它現象均同一次側熔絲熔斷的情況。

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