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Fuses and Links
5

Fuses and Links

Fuses and Links

(OP)
I am a relatively new engineer working in the transmission and distribution of electricity.  When preparing wiring schemes i know that electrical equipment is protected by a fuse and link.  I know that a fuse blows when the supply exceeds a certain limit but can someone give me a good explanation of what the link is there for.

RE: Fuses and Links

In most cases a 'link', as in 'fused link' is merely a wire made of similar materials as a fuse, and used for the same purpose, but only in low-voltage applications (maybe <50V).

RE: Fuses and Links

check this out- www.sandc.com - then products & tech support for an explanation

RE: Fuses and Links

Normally the fuses are used in the current path to isolate the system, when there be any abnormal / high current. Whereas the Links are generally used in the neutral path just to isolate, where the current flow is very low during normal operating condition, and very high during earth fault conditions. In other words the neutral and earth will be in same potential and no current will flow in the circuit. High current carrying strips are used in links whereas thin wires are used in fuses.

In simple, Fuses are used to protect the equipment and link are used to isolate the equipment.

RE: Fuses and Links

All links are fuses, not all fuses are links.  
Fuse links when melted open a fuse cutout switch.
Here's an ABB cutout switch.

http://library.abb.com/GLOBAL/SCOT/scot235.nsf/VerityDisplay/5AD1D3E2ABA3CB0B85256E0C007388F2/$File/ICX%20%20%20DB38-631.pdf

Thats a very long link- you can find similar information by googling up "fused cutouts"
Below is another good link -worth gettin if your into T&D.

http://library.abb.com/GLOBAL/SCOT/scot235.nsf/VerityDisplay/91AD3A29A50978BF85256C550053DB0D/$File/Hard.To.Find.6th.pdf

If that one doesn't work google up "ABB, Hard to Find Information About Distribution Systems."

RE: Fuses and Links


BJC - Red star for the last link!

paulclayton1:
Highly recomended files (downloadable) worth a read from Areva (It is the old PRAG-book):
http://www.areva-td.com/servlet/ContentServer?pagename=TDE/AGF_Product/Product_Detail&amp;c=AGF_Product&cid=1056536208199&amp;rid=1018348589697&amp;lid=en&pid=1017999014820&tab=Chapters&amp;id=1056536208254

As a last note a just want to say that this site (www.eng-tips.com) is one of the best places to visit to find some info regarding engineering. Defenitely worth a visit every day. It helped me quite a lot with some problems I've encountered in my workplace.


Best Regards
Ralph

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