Abstract
With the rapid development of city construction, contradiction between power supply and demand becomes more marked, so the idea of building 500kV terminal substation is put forward. This paper analyzes the design principle of main electrical connection of 500kV terminal substation, introduces several typical main electrical connection forms and compares the reliability and economy of referred forms between traditional schemes with circuit breakers and disconnecting switches and new schemes with disconnecting circuit breakers (DCB). The new scheme of transformer line block connection with disconnecting circuit breaker is recommended as the prior of 500kV main electrical connection in 500kV smart terminal substation.
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