Using hydrogen for cooling armature
Using hydrogen for cooling armature
(OP)
Why do some generators use hydrogen for cooling of the armature windings.
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Using hydrogen for cooling armature
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RE: Using hydrogen for cooling armature
RE: Using hydrogen for cooling armature
Unfortunately, a fatal accident happened on Jan. 8, 2007 involving hydrogen cooling at an AEP (American Electric Power) plant. I think it is way too early to draw any conclusions from this newspaper article. http
RE: Using hydrogen for cooling armature
RE: Using hydrogen for cooling armature
1. Reduction of windage loss by 90%
2. Increase in machine output
3. Lower oxidation of insulation
Disadvantages
1. Since Hydrogen-air mixture of between 5/95 to 75/25 is explosive, the hydrogen content inside the casing must over 95%
2. Sealing system to prevent air ingress
3. Explosion proof stator frame (though this doesn't seem to work in many cases)
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RE: Using hydrogen for cooling armature
As mentioned it's primarily due to the much better heat transfer capability of hydrogen versus air.
Also, pure hydrogen actually reduces the fire hazard inside the machine since no oxygen is present.
RE: Using hydrogen for cooling armature
RE: Using hydrogen for cooling armature
Also the friction at high rotating speed is significantly less than air.
Paraphrasing Yogi Berra, engineering is 90% technical and the other half is administrative.
RE: Using hydrogen for cooling armature
Is density the determining factor?
RE: Using hydrogen for cooling armature
There are a lot of air cooled units too.
The surface of the rotor ( the blocks that retain the copper bars) have inlet and outlet scoops that pump cooling gas into the passages in the copper bars to the center of the rotor and back out. Then there is a fan at either one end or both that circulates the heated gas from the gap space through coolers to remove the heat.
RE: Using hydrogen for cooling armature
RE: Using hydrogen for cooling armature
This thread is five months old, so probably not much point in adding to it.