Products At Work: TDM Case Study
The following internal analysis was received from a major western utility company. The company has to date installed temperature differential monitoring on 15% of operating LTC's. The analysis covers the 6-month time period from 1/1/97 through 6/30/97. The vast majority of LTC troubles were identified as shown with TDM system technology. Ignoring the worst case scenario where a rewind would be required, the material and labor cost savings are still significant.
The customer outage information reflects a 4.5% reduction for the six-month time period. Projecting this percentage to include a TDM installation on all LTC's results in an annual outage reduction of 29.97%.
Below is a list of transformers that were removed from service before they failed. Problems were detected by infrared, TDM's, and DGA tests. If left in service, at a minimum, customer outages would have occurred for each failure. Worst case scenario would include a total transformer rewind. On average for a typical 45MVA transformer winding failure, the total costs incurred would be approximately $500K. These costs would include removal and installation of the transformer.
1. Substation #1
2. Substation #2
3. Substation #3
4. Substation #4
5. Substation #5
6. Substation #7
7. Substation #8
8. Substation #9
OUTAGE INFORMATIONTotal Customers = 28,069 customers
System Average Restoration Time = 105 minutes
Estimated Customer Minutes Saved = 2,947,245
Customers in System = 4,756,717
AIDI Saved = 0.62 minutes = 4.5 %
1997 YTD AIDI = 13.11 minutes
Potential AIDI W/O AIDI Saved = 13.73 minutes
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