We have a project coming up to replace 5 padmount transformers which feed power to a mall. Each trx is rated 1 MVA, transformers and cables are more than 40 years old. In summer months the trxs are lightly loaded, max load is 500kva. Each transformer secondary cables are connected to individual panel, 600y/347v. While changing the transformers ( one by one) we have to provide temporary power to the part which is connected to the trx being replaced. We have two options-option 1 -bring a temporary generator rated of 500kw and connect to the panel, it will take approximately 5 days to replace one transformer as we have to complete other civil work associated with that. So the temp gen will run for 5 days. option 2- Since the transformers are lightly loaded (just over 50% of their rated loads) we can possibly connect one panel to another one with cables and ckt breaker. This option would be cheaper but it poses some unknowns- we have to see if there is way to connect the panels, one with next one…since it is a mall it would be challenging..the panels are approximately 100ft away from each other. But the main concern is- those transformers and the secondary cables will be operated at 100% load for the first time in last 40 year ( the winter max load is about 60-70% of rated capacity.
Does anyone have any experience with this type of situation or similar projects.
The general option looks easy but to run a general 24 hr 5 days continuous raises questions about general reliability and noise complaints.
Does anyone have any experience with this type of situation or similar projects.
The general option looks easy but to run a general 24 hr 5 days continuous raises questions about general reliability and noise complaints.