mmpower
Electrical
- Nov 4, 2007
- 1
Have a customer presently being served by utility with a 12.47 primary through step downs distributing/metering at 7200/4160 throughout the facility via aerial distribution. The transformers are overloaded and the current thought is to have utility remove transformers and distribute the 12.47/7.2 throughout, which would then be a direct feed from the utility distribution voltage.
I'm told most existing transformers are 4800/8320Y rated, single phase pole mounted cans, connected phase-gnd primary, with 120/240 1-ph secondary. There are a few 2400x4800 transformers also.
They (facilities electrical group) have the thought that they can retain most of the 4800/8320Y transformers and adjust the tap settings for the new 7200 (L-G) service voltage. Has anyone ever done (or heard of) this? Aren't those xfmr's rated for a maximum L-G nominal voltage of 4800?
There are obviously other issues (such as insulator ratings, cutout and surge ratings, fault current ), but the transformer issue concerned me.
Thanks!
I'm told most existing transformers are 4800/8320Y rated, single phase pole mounted cans, connected phase-gnd primary, with 120/240 1-ph secondary. There are a few 2400x4800 transformers also.
They (facilities electrical group) have the thought that they can retain most of the 4800/8320Y transformers and adjust the tap settings for the new 7200 (L-G) service voltage. Has anyone ever done (or heard of) this? Aren't those xfmr's rated for a maximum L-G nominal voltage of 4800?
There are obviously other issues (such as insulator ratings, cutout and surge ratings, fault current ), but the transformer issue concerned me.
Thanks!