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Lancer
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Join Date: Jan 2008
Posts: 3

Creepage Block

01/24/2008 9:40 AM

When looking at the drawing of generator field wiring slot, I see "creepage block" between coil wedge and the coil. I suppose, its purpose is to create ventilation passage for the coil. Why is it called "creepage"?
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TVP45
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Join Date: Jul 2007
Posts: 4448
Good Answers: 143
#1

Re: creepage block

01/24/2008 10:42 AM

Creepage is the shortest distance ALONG THE SURFACE of an insulator between two conductors at differing potentials. Creepage distance is important in order to prevent surface tracking due to breakdown from moisture, dirt, etc. Frequently, designers will even put blocks that look like corrugations in to make that distance as long as possible. Excuse my caps use; my italics button isn't working.

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rdyhas
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Join Date: Jan 2008
Posts: 4
#5
In reply to #1

Re: creepage block

01/25/2008 12:20 AM

how to determine a creepage distance beetwen to conductors at differing potentials?

what is need consideration for determine a creepage distance?

thanks
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Graebeard
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Engineering Fields - Electrical Engineering - New Member

Join Date: Aug 2007
Location: Toronto
Posts: 239
Good Answers: 9
#2

Re: creepage block

01/24/2008 1:55 PM

Further to TVP45, minimum creepage distances are specified in the construction and design standards to which the equipment is built. The higher the voltage in the equipment, the larger the creepage dimension will be. I guess they chose "creepage" since electrical arcs appear to "creep" across a surface between two conductors.

Either that or the fellow who coined the term was named Harry Creep (just kidding!)

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TVP45
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Join Date: Jul 2007
Posts: 4448
Good Answers: 143
#3
In reply to #2

Re: creepage block

01/24/2008 2:05 PM

And, when you asked him how old he was, he always said "Oh, one Creepage" groan

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SEABEE
Associate

Join Date: Jan 2008
Posts: 30
#4

Re: Creepage Block

01/24/2008 11:32 PM

Great info, thanks all.
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Lancer
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Posts: 3
#6

Re: Creepage Block

01/27/2008 3:04 AM

Thanks, it is more clear now.
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Graebeard (1); Lancer (1); rdyhas (1); SEABEE (1); TVP45 (2)

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