More on drop-out fuses
More on drop-out fuses
(OP)
What is the experience out there with the failure rate of drop-out fuses? Around half of the drop-out fuse operations in the distribution area I work in are not due to electrical faults - the things just drop open seemingly of their own accord. I have a few ideas, mostly concerned with thermal effects (high percentage tin alloys, tin melts at 220C), poor contacts, contact springs possibly annealing, the cheap (and nasty) construction of the elements, and the efforts of big boofy blokes giving the nut a quick wrench with a 20" shifter to make sure it's tight.
The odd thing about it is that sometimes one particular location will be troublesome for a long while (up to 5 or 6 sets of fuses) before it "settles down".
Any ideas / suggestions, or is that just life with a 10 buck protective scheme? BTW, the fuses are generously rated and are used on 11kV/415V 3-phase distribution transformers at all sizes from 63kVA to 1000kVA.
Bung
The odd thing about it is that sometimes one particular location will be troublesome for a long while (up to 5 or 6 sets of fuses) before it "settles down".
Any ideas / suggestions, or is that just life with a 10 buck protective scheme? BTW, the fuses are generously rated and are used on 11kV/415V 3-phase distribution transformers at all sizes from 63kVA to 1000kVA.
Bung






RE: More on drop-out fuses
http://www.elektrolites.com/dropoutfuses.html
http://www.elektrolites.com/products.html
http://www.energy.com.au/ea/earetail.nsf/AttachmentsByTitle/CIA1146b/$FILE/cia1146B.pdf
http://www.fusegearelectric.com/profile.htm
http://energexdev.indelta.com.au/glossary_D.htm
http://www.yaohua-china.com/yaohua/i3-p3.htm
etc. for more info
RE: More on drop-out fuses
Bung
RE: More on drop-out fuses
The brand we use are S&C, 15kv, 100A.
wbd
RE: More on drop-out fuses
BTW, DO fuses come at 1 buck a pop in my part of the world !!