Scotty
Thanks
Weve got the original data sheet for the motor so know quite a bit about it. Its got 2 field windnigs so it could be shunt or compound.
I think we will go with timer start. Do I calculate resistor sizes according to the starting current limit I want to achieve at each of the 3...
Scotty
Thanks for this. Ive got the original motor data sheet, so armature and field resistances. There are 3 stages, the fourth contactor is the last (but first to close) that acts with the overload to protect the motor should that be required. Are the calcs straightforward then?
Cheers
H
Hi Everyone
I've got an old DC motor starter to refurbish (2HP). Photo attached. I'm not sure about the starting arrangement, back emf or timer. Any clues?
Once I've worked out the starting arrangement I need to size the resistors. Again, any clues?
Cheers
H
Dear all
Thank you for the advice. Scotty, there is a CDG14 protecting the same feeder for earth fault, so the CDG34 is probably only doing overcurrent. I've confirmed it's a 5A relay, so a fairly high burden. The sverker unit we have will probably be ok, it can deliver up to 50 single phase...
Hi
I have a one off GEC CDG 34 relay to test, a legacy relay left on a fairly new system, it protects an 11kV transformer feeder. The remainder of the relays are modern digital type.
Can anyone suggest a suitable secondary test set for the high currents involevd?
Guys
I'm running up a new dry cast transformer tomorrow. No load on it yet but it will feed some 11kV pumps in the coming weeks. I'm connecitng a Ranger 7000T power quality analyser to get a feel for it's effect on the system, including harmonics. I'll post the results tomorrow evening (GMT)...
Hi. I'm studying a power system which has a 3.3kV 2500kW Ideal Electric Generator, Frame 21120. I can't get a hold of the information for the impedance model, dynamic model and Q,a,b,c, PMin figures. Has anyone modelled this one before?
Cheers eti
Ah Scotty
That all depends on what side your on?? I'm north, but only just.
Support for GE is a bit of a concern but I've seen their guys quite a bit lately on another project. Not directly employed but part of a good network.
Your spot on about testing. Lots of kit today tests the software...
Hi All. Thanks for your advice, all very useful. It's come down to GE, Siemens and Areva. Integrating the GE relays look like the easiest job to engineer (Yes LOADXFER I'm doing that all by ma wee self and I do know how to engineer it. I fact, I might even fit them myself just for the fun of...
lz5pl
Thanks, very useful. I also like Siemens and Areva and both provide good support. I'll look at the VAMP agan. I've got some experiecne with them and is was all good.
Proven units are the way forward.
Cheers
eti
Dear all. Thank you for your contribution. To answer a frew point;
The installation is heavy industrial and in the UK.
It's mostly protecting 11kV, mainly transformer feeders, but some motors.
We do not require to derive any signal other than basic local alarms. No SCADA for example.
My...
Hi all
I have a large number of old GEC relays to replace and have been looking at the digital relays on offer. I can't see much between them in terms of function. I got a long list down to GE Multilin, Schneider SEPAM, Areva MIDOS and Siemens SIPTOTEC.
Does anyone have experiecne of how...
