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#1
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. -- EA |
#2
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Voltage regulation wrt resistive and inductive loads...
Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Hi, In real world situation you will have hard time finding purely resistive load. Most loads are inductive affecting power factor. IMO, your generator maybe border line under powered for the welder. |
#3
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Jan 12, 5:55*pm, Tony Hwang wrote:
Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. thats actually a real interesting question... with a pure reactive (inductive or capacitive) load, the current flow in the windings will cause a voltage drop but if i'm not mistaken since there is no (or very little) actual power flow, there will not be a load on the engine so the engine speed will not be a factor. with a pure resistive load, the current through the windings will cause a voltage drop AND there will be a load on the engine that will try to slow it down. It is the job of the speed governor on the engine to keep the speed constant. If the speed drops the voltage and frequency will drop due to the engine speed drop. So for a given amps, you may get more of a drop with a resistive load depending on how tight the governor speed control the engine. Mark |
#4
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On 1/12/2013 4:11 PM, Mark wrote:
On Jan 12, 5:55 pm, Tony wrote: Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. thats actually a real interesting question... with a pure reactive (inductive or capacitive) load, the current flow in the windings will cause a voltage drop but if i'm not mistaken since there is no (or very little) actual power flow, there will not be a load on the engine so the engine speed will not be a factor. with a pure resistive load, the current through the windings will cause a voltage drop AND there will be a load on the engine that will try to slow it down. It is the job of the speed governor on the engine to keep the speed constant. If the speed drops the voltage and frequency will drop due to the engine speed drop. So for a given amps, you may get more of a drop with a resistive load depending on how tight the governor speed control the engine. Mark I'd like to see some measurements. We don't know much about the load. If it's a transformer and a stick welder, is there reason to believe that the load voltage/current presented by the arc isn't relatively in phase? Would be interesting to see the V-I curve of a plasma under welding conditions. |
#5
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
Tony Hwang wrote:
Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Hi, In real world situation you will have hard time finding purely resistive load. Most loads are inductive affecting power factor. IMO, your generator maybe border line under powered for the welder. Just get an old electric range top. You can switch the loads on and off as necessary. John |
#6
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Voltage regulation wrt resistive and inductive loads...
"John" wrote in message ... Tony Hwang wrote: Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Hi, In real world situation you will have hard time finding purely resistive load. Most loads are inductive affecting power factor. IMO, your generator maybe border line under powered for the welder. Just get an old electric range top. You can switch the loads on and off as necessary. Infinate burner controls don't present a steady load. |
#7
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
PrecisionmachinisT wrote:
"John" wrote in message ... Tony Hwang wrote: Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Hi, In real world situation you will have hard time finding purely resistive load. Most loads are inductive affecting power factor. IMO, your generator maybe border line under powered for the welder. Just get an old electric range top. You can switch the loads on and off as necessary. Infinate burner controls don't present a steady load. I did say old like in low, medium , high. or you could use a couple of electric baseboard heaters. John |
#8
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
"John" wrote in message ... PrecisionmachinisT wrote: "John" wrote in message ... Tony Hwang wrote: Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Hi, In real world situation you will have hard time finding purely resistive load. Most loads are inductive affecting power factor. IMO, your generator maybe border line under powered for the welder. Just get an old electric range top. You can switch the loads on and off as necessary. Infinate burner controls don't present a steady load. I did say old like in low, medium , high. or you could use a couple of electric baseboard heaters. Or you could wire the elements up directly. |
#9
Posted to alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
"Existential Angst" wrote:
Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. All the generator cares is how much real power it takes to spin. It's not measuring LC, just measuring the final outcome. 1-2 % really surprises me. Greg |
#10
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Voltage regulation wrt resistive and inductive loads...
On Jan 13, 1:30*am, gregz wrote:
"Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. All the generator cares is how much real power it takes to spin. It's not measuring LC, just measuring the final outcome. 1-2 % really surprises me.. Greg Not true. If power factor is bad, ( ie inductive) the generator can be overloaded at below it's rated capacity in Kw. |
#11
Posted to alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Sun, 13 Jan 2013 01:30:53 +0000 (UTC), gregz
wrote: "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. All the generator cares is how much real power it takes to spin. It's not measuring LC, just measuring the final outcome. 1-2 % really surprises me. No, it cares about the current being supplied. Heating is done by the current, not the real power generated. Generators are rated in KVA, not watts. |
#12
Posted to alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Jan 13, 5:50*pm, wrote:
On Sun, 13 Jan 2013 01:30:53 +0000 (UTC), gregz wrote: "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. All the generator cares is how much real power it takes to spin. It's not measuring LC, just measuring the final outcome. 1-2 % really surprises me. No, it cares about the current being supplied. *Heating is done by the current, not the real power generated. *Generators are rated in KVA, not watts. Watts generated (in any conductor = Amps squared X resistance. Poor power factor increases amps which means more heat has to be dissipated in the generator. (in the whole circuit in fact) |
#13
Posted to alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Mon, 14 Jan 2013 00:28:47 -0800 (PST), harry
wrote: On Jan 13, 5:50*pm, wrote: On Sun, 13 Jan 2013 01:30:53 +0000 (UTC), gregz wrote: "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. All the generator cares is how much real power it takes to spin. It's not measuring LC, just measuring the final outcome. 1-2 % really surprises me. No, it cares about the current being supplied. *Heating is done by the current, not the real power generated. *Generators are rated in KVA, not watts. Watts generated (in any conductor = Amps squared X resistance. What about "watts generated"? Is English your first language? Poor power factor increases amps which means more heat has to be dissipated in the generator. (in the whole circuit in fact) ....and your point? |
#14
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Voltage regulation wrt resistive and inductive loads...
On Jan 14, 2:01*pm, wrote:
On Mon, 14 Jan 2013 00:28:47 -0800 (PST), harry wrote: On Jan 13, 5:50*pm, wrote: On Sun, 13 Jan 2013 01:30:53 +0000 (UTC), gregz wrote: "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. All the generator cares is how much real power it takes to spin. It's not measuring LC, just measuring the final outcome. 1-2 % really surprises me. No, it cares about the current being supplied. *Heating is done by the current, not the real power generated. *Generators are rated in KVA, not watts. Watts generated *(in any conductor = Amps squared X resistance. What about "watts generated"? *Is English your first language? Poor power factor increases amps which means more heat has to be dissipated in the generator. (in the whole circuit in fact) ...and your point? The point is that if power factor is poor, the generator will have to be derated you numbskull.. |
#15
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Sat, 12 Jan 2013 17:10:58 -0500, Existential Angst wrote:
Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Depending on what's loading the transformer, a transformer load isn't necessarily substantially inductive. That's the egghead theory. Unfortunately, my knowledge of welders starts with being able to stick weld, then has this long, dark, gap, then gets to the circuits theory that I know as an electrical engineer. So I couldn't tell you just what the power factor of a welder is (PF = how "resistive" it is). I can tell you that it probably varies with the type of welder, what its technology is, and probably by whether it's cheap Chinese or quality late-model 'merican. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com |
#16
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Voltage regulation wrt resistive and inductive loads...
On Jan 12, 5:48*pm, Tim Wescott wrote:
On Sat, 12 Jan 2013 17:10:58 -0500, Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Depending on what's loading the transformer, a transformer load isn't necessarily substantially inductive. That's the egghead theory. *Unfortunately, my knowledge of welders starts with being able to stick weld, then has this long, dark, gap, then gets to the circuits theory that I know as an electrical engineer. *So I couldn't tell you just what the power factor of a welder is (PF = how "resistive" it is). *I can tell you that it probably varies with the type of welder, what its technology is, and probably by whether it's cheap Chinese or quality late-model 'merican. -- Tim Wescott Control system and signal processing consultingwww.wescottdesign.com Looks like the Chinese have made tremendous progress when it comes to inverter welders. This one has gotten good reviews. I have no idea how durable it is. My guess is not great. A quick check didn't turn up any complaints. I would not buy the 3 in 1 unit. (has plasma capabilities) http://www.youtube.com/watch?v=CblpZF54_uM $500 seems like a good way to learn Arc and TIG welding to me. If someone got two years out of it, built their skill set and then tossed it in the trash, I think someone would be ahead of the game. Seems to me it's an affordable little machine idea for someone who has space issues on a tight budget and who wants to learn on the cheap. |
#17
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Voltage regulation wrt resistive and inductive loads...
"Tim Wescott" wrote in message ... On Sat, 12 Jan 2013 17:10:58 -0500, Existential Angst wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, this would require a lot of heaters, a pita to wire up. Depending on what's loading the transformer, a transformer load isn't necessarily substantially inductive. That's the egghead theory. Unfortunately, my knowledge of welders starts with being able to stick weld, then has this long, dark, gap, then gets to the circuits theory that I know as an electrical engineer. So I couldn't tell you just what the power factor of a welder is (PF = how "resistive" it is). I can tell you that it probably varies with the type of welder, what its technology is, and probably by whether it's cheap Chinese or quality late-model 'merican. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com Tim. Just a thought.... Would a large capacitor across the line help the power factor? WW |
#18
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Voltage regulation wrt resistive and inductive loads...
On Jan 12, 10:10*pm, "Existential Angst" wrote:
Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. |
#19
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Jan 12, 5:10*pm, "Existential Angst" wrote:
Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. |
#20
Posted to rec.crafts.metalworking,alt.home.repair
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Voltage regulation wrt resistive and inductive loads...
On Jan 13, 3:40*pm, Transition Zone wrote:
On Jan 12, 5:10*pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? * *I haven't yet tested it with purely resistive loads, *cuz, *well, PURELY resistive? *Where in the heck would you find a PURELY RESISTIVE load? Oh, Attenuators. I didn't know that. I guess that part of the circuit is purely resistive or resistive/inductive. (I just looked up "purely resistive") |
#21
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Voltage regulation wrt resistive and inductive loads...
On Jan 13, 3:44*pm, Transition Zone wrote:
On Jan 13, 3:40*pm, Transition Zone wrote: On Jan 12, 5:10*pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? * *I haven't yet tested it with purely resistive loads, *cuz, *well, *PURELY resistive? **Where in the heck would you find a PURELY RESISTIVE *load? Oh, Attenuators. I didn't know that. *I guess that part of the circuit is purely resistive or resistive/inductive. (I just looked up "purely resistive") An electric heating element, like a range element, toaster, heater without a fan, water heater, light bulb etc are examples. They all have some theoretical small inductance, capacitance, too, but it's so tiny it can be ignored. The voltage and current through those devices is in phase. |
#22
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Voltage regulation wrt resistive and inductive loads...
On Jan 13, 4:02*pm, "
wrote: On Jan 13, 3:44*pm, Transition Zone wrote: On Jan 13, 3:40*pm, Transition Zone wrote: On Jan 12, 5:10*pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? * *I haven't yet tested it with purely resistive loads, *cuz, *well, *PURELY resistive? **Where in the heck would you find a PURELY RESISTIVE *load? Oh, Attenuators. I didn't know that. *I guess that part of the circuit is purely resistive or resistive/inductive. (I just looked up "purely resistive") An electric heating element, like a range element, toaster, heater without a fan, water heater, light bulb etc are examples. They all have some theoretical small inductance, capacitance, too, but it's so tiny it can be ignored. *The voltage and current through those devices is in phase. I mean, you know. To be technical, in DC/AC/Grounding in electrician school, they teach you that nothing is "purely resistive" |
#23
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Voltage regulation wrt resistive and inductive loads...
On Jan 14, 10:04*pm, Transition Zone wrote:
On Jan 13, 4:02*pm, " wrote: On Jan 13, 3:44*pm, Transition Zone wrote: On Jan 13, 3:40*pm, Transition Zone wrote: On Jan 12, 5:10*pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? * *I haven't yet tested it with purely resistive loads, *cuz, *well, *PURELY resistive? **Where in the heck would you find a PURELY RESISTIVE *load? Oh, Attenuators. I didn't know that. *I guess that part of the circuit is purely resistive or resistive/inductive. (I just looked up "purely resistive") An electric heating element, like a range element, toaster, *heater without a fan, water heater, light bulb etc are examples. * *They all have some theoretical small inductance, capacitance, *too, *but it's so tiny it can be ignored. *The voltage and current *through those devices is in phase. I mean, you know. To be technical, in DC/AC/Grounding in electrician school, they teach you that nothing is "purely resistive" True. But electric heaters are near as dammit for practical purposes. |
#24
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Voltage regulation wrt resistive and inductive loads...
On Sun, 13 Jan 2013 12:40:11 -0800 (PST), Transition Zone
wrote: On Jan 12, 5:10*pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, PURELY resistive? Where in the heck would you find a PURELY RESISTIVE load? A heater? |
#25
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Voltage regulation wrt resistive and inductive loads...
A large block of carbon crystal with plates on the outside.
Compression of the plates changes the resistance. Used them in lab experiments. 200 amp switcher supplies. Martin On 1/13/2013 2:40 PM, Transition Zone wrote: On Jan 12, 5:10 pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, PURELY resistive? Where in the heck would you find a PURELY RESISTIVE load? |
#26
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Voltage regulation wrt resistive and inductive loads...
On Jan 14, 2:45*am, Martin Eastburn
wrote: A large block of carbon crystal with plates on the outside. Compression of the plates changes the resistance. Used them in lab experiments. *200 amp switcher supplies. Martin You can buy one. Sewing machine speed foot control. |
#27
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Voltage regulation wrt resistive and inductive loads...
In article ,
Martin Eastburn wrote: A large block of carbon crystal with plates on the outside. Compression of the plates changes the resistance. Used them in lab experiments. 200 amp switcher supplies. Used to be used for speed control in electric trolleys, circa 1910. http://books.google.com/books?id=9zM...PA29&dq=carbon +pile+rheostat&source=bl&ots=G0OU5QxYJv&sig=hMmbFw em2ne9HADMpw6RunAhqOg&h l=en&sa=X&ei=2BX0ULi9KJKD0QHX_IGgCA&sqi=2&ved=0CEQ Q6AEwBA#v=onepage&q=car bon%20pile%20rheostat&f=false Joe Gwinn Martin On 1/13/2013 2:40 PM, Transition Zone wrote: On Jan 12, 5:10 pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. I'm assuming a transformer load is substantially inductive? I haven't yet tested it with purely resistive loads, cuz, well, PURELY resistive? Where in the heck would you find a PURELY RESISTIVE load? |
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Voltage regulation wrt resistive and inductive loads...
On Jan 13, 8:40*pm, Transition Zone wrote:
On Jan 12, 5:10*pm, "Existential Angst" wrote: Awl -- In a portable generator. Does one type of load vs the other make it more difficult for a typical portable generator to maintain constant voltage? Esp at a current approaching the continuous current limit of the generator. I ask bec the mfr claims 1-2% regulation. *A small miller welder is causing 12%+ variation, within the current limitations, with the voltage variation being fairly proportional to load. *I'm assuming a transformer load is substantially inductive? * *I haven't yet tested it with purely resistive loads, *cuz, *well, PURELY resistive? *Where in the heck would you find a PURELY RESISTIVE load? Any electric heater is as near as dammit. |
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