2006-09-29 05:33:34 · 3 answers · asked by lito 1 in Science & Mathematics ➔ Engineering
there is a problem of word definitions here.
Distribution is the act of delivering something (energy or information) from a source to (usually several) endpoints.
Any lines used to that end could be considered "distribution" lines.
However transmission is the act of delivering something also, usually (but not always) from point.
In electrical energy, transmission lines are the big high voltage lines that carry power from generation to cities, and distribution lines are the local branches.
In communications, there is a special meaning for transmission lines, meaning coax, biax, waveguide, and similar structures designed to propigate signals optimally. For example 75 ohm COAX cable is used to carry Video signals, video drivers generate a signal with a source impedence of 75 ohms, and the reciever TERMINATES the line with 75 Ohms.
2006-09-29 05:46:12 · answer #1 · answered by disco legend zeke 4 · 0⤊ 1⤋
Voltage, typically. However there is some overlap. Most utilities consider nomial system voltage of 69 kV the division point between transmission and distribution.
A better answer is that Transmission lines deliver bulk power from a source (generation or another source) to a substation. Distribution lines carry this stepped-down voltage from the substation to the customers.
2006-09-29 05:46:20 · answer #2 · answered by Anonymous · 0⤊ 1⤋
transmission lines comes from the generation plant to a substation and distribution lines comes from the substation to homes,schools etc....with the help of transformers.Transmission lines don't use transformers.
2006-09-29 07:16:37 · answer #3 · answered by The Apostle 2 · 0⤊ 0⤋