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gauravgauramu
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Join Date: Dec 2008
Location: chennai
Posts: 9

CT Dimensioning for Protection Systems

12/10/2008 1:24 PM

why different manufacturers of relay have different formulas for calculating knee point voltage as all are based on same standard?
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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
#1

Re: CT dimensioning for various protection system

12/10/2008 1:53 PM

These are two different issues. The calculations will depend on mechanical and electrical properties of the relay, while standards ensure that they are safe from shock and fire hazards. Any performance requirements in standards will be minimum threshold levels.

Grae
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Anonymous Poster
#2

Re: CT Dimensioning for Protection Systems

12/11/2008 8:54 AM

Each manufacturer's design (if not exactly the same) will have different "pull in" and "drop out" voltage values because they will have different (calculated) relationships between the mechanical work (pretravel, stroke & overtravel forces) and the electromagnetic properties of the actuator coil & structural materials.
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gauravgauramu
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Join Date: Dec 2008
Location: chennai
Posts: 9
#3
In reply to #2

Re: CT Dimensioning for Protection Systems

12/11/2008 12:15 PM

you all are relaing to electomechanical relays......Nowdays there is numeric relays all have simillar working principle
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