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The is a rotary phase converter question
John Rudd:
The rpc in essence seems simple enough....treat it as a 3 phase supply.
Now add a 3 phase generator.....The issue now is how to synchronise the 2 supplies...
My experience with 3ph, we had to sync up a generator to the local supply. This was done by speeding up or slowing the prime mover..( a 3.6 MW gas generator...)
So now to paralleling 2 rpc's.... I would expect there to be a slight phase difference between them due to tolerance allowances in the capacitors and also the motors....the cap values wont be exact and the motor speeds wont be exact....slip, frictional losses etc...
I wouldnt do it...easier just to get a bigger rpc or a diesel gen set...
awemawson:
I've seen pictures of the effect of a large turbine set being loaded onto the National Grid when not in phase. The main turbine shaft was bent then sheared and at a guess it was about 15" diameter !
I assume that their synchronising equipment was faulty.
timby:
I think it would be best to ask the manufacturer, someone will have tried that before.
John Rudd:
--- Quote from: awemawson on February 15, 2019, 11:06:01 AM ---I've seen pictures of the effect of a large turbine set being loaded onto the National Grid when not in phase. The main turbine shaft was bent then sheared and at a guess it was about 15" diameter !
I assume that their synchronising equipment was faulty.
--- End quote ---
I'm surprised any shears pins would have failed at a coupling, if fitted...maybe not.... :doh:
We actually sheared a coupling on one of our 3.6 MW gen sets, starting a 2.1 MW Regrigeration compressor...even though the motor was on an autotransforner starter...something went wrong, I forget what!.. :Doh:
Alphawolf45:
Well I read it on the internet so you know it has to be right :doh:
Anyway you have all convinced me that it can be done but it is beyond my set of skills...
The generator offers bonus that we sometimes lose power to the house and wife has been on me to get a generator......Uhmmm Now can somebody give me a ballpark figure on kilowatts required to feed a healthy 200 amps of 220 3 phase to my shop? Pulling a number out of the air I am guessing that 100 KW would be necessary.
By the way , I have an even dozen 3 phase machines in my shop if I only count the ones that work.. And for those I manage nicely with a 5 hp rotary phase converter aside from that power sucking EDM.
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