Ammeter connected through parallel CT's?
Ammeter connected through parallel CT's?
(OP)
First of all; I'm a tech not an engineer. This doesn't look right to me at all. I'm thinking the ammeter (ACA) is only going to see the unbalance between A and C phases (jumper on right of PFFR relay). I don't know what the formula for this would be, but in the past I've always seen an ammeter on a single phase, or on 3 phases with a switch. I'm thinking it's a drafting mistake, but it is connected like that. I think the meter, and transducer should be on B phase, and the C0/ground jumper on A and C. Your thoughts would be appreciated. See link for drawing.
Operators use this meter to set their flow, and I think they are overheating the motor.
http:// files.engi neering.co m/getfile. aspx?folde r=7726af31 -78fe-4e40 -9241-3e1b bed8db0b&a mp;file=Ex pander.jpg
Operators use this meter to set their flow, and I think they are overheating the motor.
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RE: Ammeter connected through parallel CT's?
This must have some diagnostic value, vs putting the ammeter in just one of the phases. I haven't given much thought yet.
Rafiq Bulsara
http://www.srengineersct.com
RE: Ammeter connected through parallel CT's?
(Remember that Ia + I b + Ic = 0. All current going to the motor on one phase has to go back on the other two.)
The connection is esentially averaging A and C phase currents. It should work if all of the CT's are wired correctly. If one CT is backwards, the reading will always be near zero.
RE: Ammeter connected through parallel CT's?