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#1
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Three phase for a resistance load??
Hello,
The engineers in sci.engr.electrical.sys-protection were useless on this question, so I thought I would ask it here where the *real* knowledge is. The question is regarding the use of 3-phase power. I noticed an electric pottery kiln the other day that used 3-phase power. It was about a 6 or 7 kw model. As I understand it, electric kilns are resistance loads, just like a toaster oven. I had always thought that 3-phase power was an advantage only for induction loads, and had no advantage over single-phase for resistance loads. Is that correct? If so, what would the advantage be for a 3-phase kiln such as those shown at http://www.skutt.com/products/elec_req.htm ? Thanks for any enlightenment. -- To email me directly, remove CLUTTER. |
#2
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Three phase for a resistance load??
Vic Dura wrote:
Hello, The engineers in sci.engr.electrical.sys-protection were useless on this question, so I thought I would ask it here where the *real* knowledge is. The question is regarding the use of 3-phase power. I noticed an electric pottery kiln the other day that used 3-phase power. It was about a 6 or 7 kw model. As I understand it, electric kilns are resistance loads, just like a toaster oven. I had always thought that 3-phase power was an advantage only for induction loads, and had no advantage over single-phase for resistance loads. Is that correct? If so, what would the advantage be for a 3-phase kiln such as those shown at http://www.skutt.com/products/elec_req.htm ? Thanks for any enlightenment. -- To email me directly, remove CLUTTER. The advantage is lighter gauge supply wire and smaller control contactors since you are dividing the load across three wires instead of two with the resulting lower current per wire. You also balance the load across all three power phases in the building as opposed to concentrating the load on only two phases. No other particular advantages. Pete C. |
#3
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Three phase for a resistance load??
On Wed, 20 Sep 2006 12:43:51 GMT, "Pete C."
wrote: Vic Dura wrote: Hello, The engineers in sci.engr.electrical.sys-protection were useless on this question, so I thought I would ask it here where the *real* knowledge is. The question is regarding the use of 3-phase power. I noticed an electric pottery kiln the other day that used 3-phase power. It was about a 6 or 7 kw model. As I understand it, electric kilns are resistance loads, just like a toaster oven. I had always thought that 3-phase power was an advantage only for induction loads, and had no advantage over single-phase for resistance loads. Is that correct? If so, what would the advantage be for a 3-phase kiln such as those shown at http://www.skutt.com/products/elec_req.htm ? Thanks for any enlightenment. -- To email me directly, remove CLUTTER. The advantage is lighter gauge supply wire and smaller control contactors since you are dividing the load across three wires instead of two with the resulting lower current per wire. You also balance the load across all three power phases in the building as opposed to concentrating the load on only two phases. No other particular advantages. Pete C. Exactly. |
#4
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Three phase for a resistance load??
Vic Dura wrote:
Hello, The engineers in sci.engr.electrical.sys-protection were useless on this question, so I thought I would ask it here where the *real* knowledge is. The question is regarding the use of 3-phase power. I noticed an electric pottery kiln the other day that used 3-phase power. It was about a 6 or 7 kw model. As I understand it, electric kilns are resistance loads, just like a toaster oven. I had always thought that 3-phase power was an advantage only for induction loads, and had no advantage over single-phase for resistance loads. Is that correct? If so, what would the advantage be for a 3-phase kiln such as those shown at http://www.skutt.com/products/elec_req.htm ? Thanks for any enlightenment. Looking at the web page you linked to it is obvious to me that the 3-phase kilns are special purpose. They clearly state that they are special order only. I assume they are for use where you only have 3-phase available. Bill Gill |
#5
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Three phase for a resistance load??
you might have trouble getting the amprage out of a single phase
circuit in a normal instalation. Empressess #124457 The best Games a href=http://www.gamestotal.com/Multiplayer Online Games/a a href=http://www.gamestotal.com/Strategy Games/abra href=http://uc.gamestotal.com/Unification Wars/a - a href=http://uc.gamestotal.com/Massive Multiplayer Online Games/abra href=http://gc.gamestotal.com/Galactic Conquest/a - a href=http://gc.gamestotal.com/Strategy Games/abra href=http://www.stephenyong.com/runescape.htmRunescape/abra href=http://www.stephenyong.com/kingsofchaos.htmKings of chaos/abr Vic Dura wrote: Hello, The engineers in sci.engr.electrical.sys-protection were useless on this question, so I thought I would ask it here where the *real* knowledge is. The question is regarding the use of 3-phase power. I noticed an electric pottery kiln the other day that used 3-phase power. It was about a 6 or 7 kw model. As I understand it, electric kilns are resistance loads, just like a toaster oven. I had always thought that 3-phase power was an advantage only for induction loads, and had no advantage over single-phase for resistance loads. Is that correct? If so, what would the advantage be for a 3-phase kiln such as those shown at http://www.skutt.com/products/elec_req.htm ? Thanks for any enlightenment. -- To email me directly, remove CLUTTER. |
#6
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Three phase for a resistance load??
According to Pete C. :
Vic Dura wrote: I had always thought that 3-phase power was an advantage only for induction loads, and had no advantage over single-phase for resistance loads. Is that correct? If so, what would the advantage be for a 3-phase kiln ... The advantage is lighter gauge supply wire and smaller control contactors since you are dividing the load across three wires instead of two with the resulting lower current per wire. You also balance the load across all three power phases in the building as opposed to concentrating the load on only two phases. No other particular advantages. The advantages Pet mentions are relatively minor in a smallish kiln like this. The other advantage is much simpler to understand: "because it interfaces with 3 phase power". Kilns like this are most often situated in light industrial or commercial buildings. Such buildings are usually fed with three phase. Aside from general purpose outlet circuits (and _some_ lighting), the higher power circuits (ones you'd sling 30A at 240V devices on) are virtually all 3 phase (or 2 phase of 3) devices. Which is why, for example, in large commercial wood working shops, even the smaller tools (eg: a 14" bandsaw with a 1HP motor, which'd normally be on a 15A 120V circuit in a home hobbyist's house) are three phase. -- Chris Lewis, Una confibula non set est It's not just anyone who gets a Starship Cruiser class named after them. |
#7
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Three phase for a resistance load??
According to :
you might have trouble getting the amprage out of a single phase circuit in a normal instalation. Not at all. Dryer circuits are 30A/240V circuits (7200W). Stove circuits are up to 12Kw. My garage is 24Kw ;-) -- Chris Lewis, Una confibula non set est It's not just anyone who gets a Starship Cruiser class named after them. |
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