DrDrreeeaaa
Electrical
- Apr 25, 2008
- 266
Hi All
My client currently has two 400V points of supply and has requested a third point of supply from the distributor to cater for a planned expansion.
Due to retrospective changes in regulations my client is now required to change his assets to one point of supply only.
Supply at HV is being considered due to the relatively large (about 100m) seperation between major load concentrations on the site. Customer-owned HV distribution on site would reduce cable sizes considerably and therein the overall cost of the works.
I personally do not like the option and would prefer to see 1-off Low Voltage point of supply at a transformer sized to serve the entire site and have the customer pay for the extra cables.
If the HV supply option is taken the distributor will remove his existing transformers and the customer will have to install and maintain new ones. The cost benefits are only obtained if several smaller transformers are used. In addition a new HVMSB would be required in addition to the new LV MSB to cater for the expansion.
In a cursory sense it appears that the capital costs are about even.
There has been some talk about buying the existing xfmrs from the distributor for reuse.
The customer would have to pay for and maintain the new transformers and HV switchgear, for which his maintenance staff have no idea etc.
ATM the issue is pending advice from the distributor
Does anyone have experience in this sort of feasibility that could offer some advice. Cheers.
Michael
My client currently has two 400V points of supply and has requested a third point of supply from the distributor to cater for a planned expansion.
Due to retrospective changes in regulations my client is now required to change his assets to one point of supply only.
Supply at HV is being considered due to the relatively large (about 100m) seperation between major load concentrations on the site. Customer-owned HV distribution on site would reduce cable sizes considerably and therein the overall cost of the works.
I personally do not like the option and would prefer to see 1-off Low Voltage point of supply at a transformer sized to serve the entire site and have the customer pay for the extra cables.
If the HV supply option is taken the distributor will remove his existing transformers and the customer will have to install and maintain new ones. The cost benefits are only obtained if several smaller transformers are used. In addition a new HVMSB would be required in addition to the new LV MSB to cater for the expansion.
In a cursory sense it appears that the capital costs are about even.
There has been some talk about buying the existing xfmrs from the distributor for reuse.
The customer would have to pay for and maintain the new transformers and HV switchgear, for which his maintenance staff have no idea etc.
ATM the issue is pending advice from the distributor
Does anyone have experience in this sort of feasibility that could offer some advice. Cheers.
Michael