End of Life
End of Life
(OP)
All,
Is there an IEEE standard that says, TYPICALLY with ongoing maintenance and normal use, a unit substation, dry type transformer(from 1000kVA to 5000kVA) is End of Life after??? I seem to recall a figure of 30 years, but I'm not finding it.
Mike
Is there an IEEE standard that says, TYPICALLY with ongoing maintenance and normal use, a unit substation, dry type transformer(from 1000kVA to 5000kVA) is End of Life after??? I seem to recall a figure of 30 years, but I'm not finding it.
Mike






RE: End of Life
RE: End of Life
RE: End of Life
RE: End of Life
You get a star jwerthman..
Mike
RE: End of Life
Looking for 4160 to 13.8kV types
RE: End of Life
One reference is Appendix G — Report of transformer reliability survey in IEEE Std 493-1997 …Design of Reliable Industrial and Commercial Power Systems [Gold Book] but it looks primarily based on liquid-filled transfomers. Drytype transfomers seem to be “newer” than oil in the listed range, so it may be more difficult to find significant reliability data. With more recent improvements in materials and processes, newer dry designs may also have increasing lifespan.
An example of one undesirable rating combination sometimes found in drytypes of this range are 15kV-class primaries with 60kVBIL ratings, where 95kVBIL is standard for oil-dielectric equivalents.
RE: End of Life
http://www.usace.army.mil/publications/armytm/tm5-811-1/chap4.pdf
for:
Complete coordination should be performed to ensure proper
protection for electrical equipment and systems, to obtain the required degree of availability, reliability and maintainability, and to achieve the most cost effective billing, construction, operation and maintenance costs during a station life of 25 years or less.
RE: End of Life
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RE: End of Life
http://www.copper.org/applications/electrical/energy/trans_efficiency.html
for:
Most transformers are designed to operate for a minimum of 20-30 years at the nameplate load, if properly sized, installed and maintained. Transformers loaded above the nameplate rating over an extended period of time may have reduced life expectancy.
http://oee.nrcan.gc.ca/egi/english/dry_type/dry_save.cfm?PrintView=N&Text=N
for: 30 years of useful life-expectancy