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?

Reply to
Hitesh Patel
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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?

Reply to
Hitesh Patel

hello,

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

Reply to
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.)

Reply to
SeppoX

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