The Proper Selection of a Distribution Substation Transformer

QUESTION: Assume that one distribution transformer of a substation supplies three primary feeders. The 30-min annual maximum demands per feeder are listed in the table, together with the power factor (PF) at the time of annual peak demand. See Table in Video Assume a diversity factor of 1.15 among the three feeders for both real power (P). a)Calculate the 30-min annual maximum demand on the substation transformer in KW and KVA. b)Find the load diversity LD in KW. c)Select a suitable substation transformer size if zero load growth is expected and if the company permits as much as 25% short-time overloads on the distribution side of substation transformers. Among the standard three-phase transformer sizes, those available are: See List in Video d)Now assume that the substation load will increase at a constant percentage rate per year and will double in 10 years. If the 7500/9375 KVA - rated transformer is installed, in how many years will it be loaded to its fans-on rating? #SubstationTransformers #LoadGrowth #DiversifiedDemand To contact me send message to my WhatsApp: +55 32 999 163 417 Para entrar em contato comigo envie mensagem para meu WhatsApp: +55 32 999 163 417