regarding Induction type over current relay

hello,
why the rotating alluminium disk of induction type over current relay's surface is rough or dotted? and why its shape is spiral?

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hello,
why the rotating alluminium disk of induction type over current relay's surface is rough or dotted? and why its shape is spiral?
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On 30 May 2007 01:27:52 -0700, Hitesh Patel

I don't know about the rough surface, but the shape is to achieve a certain kind of inverse delay (IDMT) characteristics. (Remove the two Roentgen-ray characters to reply.)
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hello,
why the rotating alluminium disk of induction type over current relay's surface is rough or dotted? and why its shape is spiral?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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