Electrical Transmission and Distribution Reference: Supplement

arrangement associated transformer automatic bulk power source bus fault cable capacitors circuit breakers circulating current conductors consumers cost cuits curves deenergized disconnecting switch distribution substation distribution system distribution transformers E.E.I. Bulletin economical Electrical World equipment fault current fault occurs faulty section feeder breakers feeder fault grid high-voltage breaker impedance installed interlacing interrupting service load area load density load division load growth located low-voltage bus network protectors network system network transformers network units outage overcurrent relays overloaded transformer overloads parallel percent primary fuses primary network primary-feeder breaker primary-network unit radial primary feeders radial system reactance reclosing reclosures secondary circuit secondary faults secondary fuses secondary mains secondary network secondary substation secondary-network system sectionalizing breaker shown in Fig spot network station of Fig subfeeders substation load subtransmission circuits supply circuit three-phase tie-feeder tion trans transformer breaker transformer capacity transformer fault underground unit substation usually volt voltage drop voltage regulation