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minu
Active Contributor

Join Date: Oct 2008
Location: baroda, india
Posts: 22

electromechanical relays

07/11/2009 6:06 AM

in every electromechanical protective relay that i have seen , there are only 7 taps, watever mayb the range (eg: for and over-current relay range is 50%-200% in 7 steps of 25% each and for an earth fualt relay with range 10%-40%, 7 steps of 5% each). why only 7 taps?

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ca1ic0cat
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Hobbies - Fishing - New Member

Join Date: Jun 2006
Location: Rochester, NY
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#1

Re: electromechanical relays

07/13/2009 8:28 AM

Got a schematic or part number? That would help.

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U NO WHO
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Join Date: Apr 2009
Location: FL USA
Posts: 372
Good Answers: 9
#2

Re: electromechanical relays

07/14/2009 2:09 PM

In a word - COST. It is more cost effective to produce a few relays in volume with multiple input trip taps than many in lower volume with custom input taps (especially when these relays are being replaced in newer equipment with microprocessor controlled functions). Of course, the cost savings has a diminishing return as additional taps are added.

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