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| Current draw of electric railway compressors https://www.rypn.org/forums/viewtopic.php?f=1&t=26856 |
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| Author: | robertmacdowell [ Thu Dec 25, 2008 10:28 pm ] |
| Post subject: | Current draw of electric railway compressors |
How much current does a typical street railway compressor draw? I realize there's no such thing as "typical", but what about a GE CP-130 or a GE CP-27? Does it demand a large surge of current to start up? |
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| Author: | Randall Hicks [ Fri Dec 26, 2008 10:51 am ] |
| Post subject: | Re: Current draw of electric railway compressors |
At 600V, the continuous current draw should be about 5/4 of the motor's rating in horsepower; an 8 HP motor should draw about 10 amps continuously. The horsepower should be listed on the plate. There will be a large momentary current draw when it starts -- that's why compressors are typically fused at a much higher value than the continuous rating. 30 amp fuses are typical, so they won't blow every time the compressor starts. Hope this helps. |
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| Author: | Gord [ Fri Dec 26, 2008 3:00 pm ] |
| Post subject: | Re: Current draw of electric railway compressors |
A Westinghouse DH-16 compressor, 16cfm, which is roughly equivalent to a GE, CP-27 (15 cfm) should draw about 4.75 Amperes, if in good condtion. It would normally be fused at 10 Amperes. A one-time 600V fuse should be sufficient. If you are blowing 10 Amp fuses on a compressor of this size, there is a problem with your compressor or related wiring. There is no overload protection on these compressors so the fuse only provides overcurrent protection, primarily for the external wiring. Typically, wiring for a compressor this size would be #12 AWG. Gord McOuat MM , Halton County |
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