I'm new to the boards so let me first introduce myself. I work as a telecommunications engineer, particularly with central office-type exchange equipment at the network level. As such I'm inherently involved with inside plant power from a functional standpoint. Most of my power work is in the -48VDC realm, as well as DC microelectronics. I am not quite as familiar with AC, and have a few questions that I thought would best be addressed by the members of this forum.
Say I have equipment that needs 220 VAC single phase @ 50 Hz, and the inside plant AC is wired as 208Y/120. From a functional and theoretical point of view, is there any way to generate single-phase 208 V or 240 V from a three phase configuration, not necessarily wye? The equipment has some tolerance built in to accept anywhere from 190 to 250 V single phase. My initial assumption is that L-L voltages will still be three phase and won't work. The only single-phase is 120 V L-N, but this is not sufficient. I have seen the split-phase delta configuration that will generate 240 V but this is a line to line (L-L) measurement so it is still three phase correct? The equipment expects single phase so the 240 V it's expecting is measured from line to neutral (single phase) opposed to line to line (three phase).
Am I getting that correctly? In other words, does L-L measurement versus L-N measurement bear any indication on the number of phases involved? 120 V L-N is single phase, but 240 V L-L is still single phase?
My assumption is that the only solution would be to run 240 V single phase from two 120 V single phase legs - ignoring the discrepancy in line frequency for this discussion. This 240 VAC single phase is still measured line to line, correct? The phase angles would be 180 degrees off between the two 120 V legs that make up the 240 V. This would seem to the novice learning AC theory that there are two phases here, but it is classified as single phase.
I do need to read a bit more on three phase power, so if you could recommend a good resource I would appreciate it. I hope this isn't too basic for this particular forum, and if so I apologize.
Say I have equipment that needs 220 VAC single phase @ 50 Hz, and the inside plant AC is wired as 208Y/120. From a functional and theoretical point of view, is there any way to generate single-phase 208 V or 240 V from a three phase configuration, not necessarily wye? The equipment has some tolerance built in to accept anywhere from 190 to 250 V single phase. My initial assumption is that L-L voltages will still be three phase and won't work. The only single-phase is 120 V L-N, but this is not sufficient. I have seen the split-phase delta configuration that will generate 240 V but this is a line to line (L-L) measurement so it is still three phase correct? The equipment expects single phase so the 240 V it's expecting is measured from line to neutral (single phase) opposed to line to line (three phase).
Am I getting that correctly? In other words, does L-L measurement versus L-N measurement bear any indication on the number of phases involved? 120 V L-N is single phase, but 240 V L-L is still single phase?
My assumption is that the only solution would be to run 240 V single phase from two 120 V single phase legs - ignoring the discrepancy in line frequency for this discussion. This 240 VAC single phase is still measured line to line, correct? The phase angles would be 180 degrees off between the two 120 V legs that make up the 240 V. This would seem to the novice learning AC theory that there are two phases here, but it is classified as single phase.
I do need to read a bit more on three phase power, so if you could recommend a good resource I would appreciate it. I hope this isn't too basic for this particular forum, and if so I apologize.