Jun 3, 2003 #1 PERRO Electrical Jul 18, 2002 8 Do you know where I can find the curves of a GEC CDG14 overcurrent relays, or where I can find the B.S. 142:1966 standar?
Do you know where I can find the curves of a GEC CDG14 overcurrent relays, or where I can find the B.S. 142:1966 standar?
Jun 3, 2003 #2 umanmadhan Electrical May 22, 2003 6 you can find them in the GEC PRAG book or in one of the later relays data sheets like MCGG or KCGG. check at the Alstom.com web site Upvote 0 Downvote
you can find them in the GEC PRAG book or in one of the later relays data sheets like MCGG or KCGG. check at the Alstom.com web site
Jun 3, 2003 #3 umanmadhan Electrical May 22, 2003 6 an adder to my previous msg acc to page 139 of PRAG ( where you can see the curves) the formula for the extremely inverse curve is t=80/(Isquare-1) where t is op time in sec and I is current (multiple of plug setting) Upvote 0 Downvote
an adder to my previous msg acc to page 139 of PRAG ( where you can see the curves) the formula for the extremely inverse curve is t=80/(Isquare-1) where t is op time in sec and I is current (multiple of plug setting)
Jun 3, 2003 1 #4 DiscoP Electrical Nov 25, 2002 203 Be careful, the curves for the CDG do not follow a formula. The formulas in the PRAG that you mention are for electronic/numerical relays. If you look at the curve for the CDG14, at 5 times the current setting the relay operates in 2.05 seconds. If you put the same value into the EI formula, the operating time is 3.33 seconds If you don't have a copy of the PRAG, contact ALSTOM for a copy of the CDG14 publication. Upvote 0 Downvote
Be careful, the curves for the CDG do not follow a formula. The formulas in the PRAG that you mention are for electronic/numerical relays. If you look at the curve for the CDG14, at 5 times the current setting the relay operates in 2.05 seconds. If you put the same value into the EI formula, the operating time is 3.33 seconds If you don't have a copy of the PRAG, contact ALSTOM for a copy of the CDG14 publication.
Jun 4, 2003 1 #6 jbartos Electrical Jan 15, 2000 6,440 Suggestion: Also, post it in this Forum under: Switchgear/boards/relays/motors Upvote 0 Downvote
Jun 4, 2003 #7 jbartos Electrical Jan 15, 2000 6,440 Suggestion: Visit thread279-13401 for more info Upvote 0 Downvote
