I know that for three phase, to find the line to ground voltage you have to divide the line to line voltage by the sqrt of 3. Does the same apply for a delta wire configuration?
2006-07-13 08:14:00 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
That depends. There are 3 different delta configurations used for services from power companies in the US.
If it is ungrounded, then there is no fixed voltage, but the phase to ground voltage is considered to be the same as line to line for insulation and the like. Ground fault detectors are needed to detect if a ground fault occurs.
Another option is a corner grounded delta, where one of the 3 phase conductors is grounded. The voltage to ground of the other 2 phases is then the line to line voltage.
Another option, used to be more common (our local power company does not do this for new services) is a hi leg delta or center of one phase grounded. This grounds the center of one phase like a single phase split phase service. For example, with 240V delta this will give 120V phase to neutral. This is not the same neutral as a wye, but it is considered a neutral and is grounded. Two of the phases have 120V to ground or neutral, but the 3rd phase is 208V to ground (that is the hi leg). It is only used as part of 3 phase loads (208V single phase loads are never used for that). The newer way to get 120V from 3 phase is with a 208V wye that has 120V phase to neutral.
2006-07-14 08:51:50 · answer #1 · answered by An electrical engineer 5 · 0⤊ 1⤋
Line To Ground Voltage
2017-01-15 04:31:40 · answer #2 · answered by ? 4 · 0⤊ 0⤋
There isn't a ground for delta configuration.
2006-07-13 09:52:37 · answer #3 · answered by DoctaB01 2 · 0⤊ 0⤋
Was thinking to ask this question too
2016-07-27 04:20:27 · answer #4 · answered by Annetta 3 · 0⤊ 0⤋
OH, OH i know, i know.......ah it left me.
2006-07-13 08:17:30 · answer #5 · answered by mountainboarding1991 3 · 0⤊ 0⤋