what effect upon core losses in T/f to change in frequency &supply voltage?
482056
I am not sure I understand your question. Are you asking, what are the effects of core losses in relationship with frequency and supply voltage?\n\nThe total power loss in a transformer is a combination of three types of losses. One is due to the DC resistance in the primary and secondary windings. This is called Copper loss. The two other losses are due to Eddy Currents and Hysteresis in the core of the transformer. Copper loss, Eddy Current and Hysteresis loss result in unwanted conversion of electrical energy into heat energy.
601207
Voltage drops for multiple lighting systems are usually handled by using 277 volt AC. \n\nThe multicore cable is something I have no working knowledge on.  Sorry better to say so than to BS you.
971626
Your question isn't clear.\n\nI suspect that what you mean is "how low can I go before I can't do what I want to with the motor".\n\nDepending on the inverter manufacturer, a typical limit is around 7 hertz. This is because reducing the frequency much lower will cause feedback issues and overheating (due to harmonics) in the drive. Also possible is the cycling frequency of the thyristors.\n\nMost applications will prefer low-end frequencies in excess of 12 hertz - to avoid possible tuning/torsional amplification with the structure to which the motor is mounted. No sense trying to run right on a structural resonance point!\n\nPracitacally speaking, there's also an upper limit on frequency as well, usually imposed by the motor design. Often, this is approximately at 2.2 times line frequency (133 hertz for 60 hertz systems, 110 hertz for 50 hertz systems).
615599
Operating 60Hz appliances at 50Hz or viceversa may result in excessive heat buildup in transformers or in certain types of electric motors. \nIf you wish to safely operate 115V 60Hz appliances at 115V 50Hz then the following steps can be attempted: \n\nContact the manufacturer of the appliance. It may be possible to safely operate at 50Hz with the manufacturer's approval. \n\nSee if an alternate 240V 50Hz or 115V 50Hz power supply or electrical motor is available. Some manufacturers sell the same appliance or electric tool in many countries around the world and may be able to retrofit the power supply or electrical motor to 240V 50Hz. Some regions of Japan have 100V 50Hz supplies while others have 100V 60Hz supplies so it is not uncommon for Japanese manufactured electrical devices to have 50Hz solutions. \n\nIt is possible to purchase 60Hz sine wave power systems that take 240V 50Hz on input and produce 115V 60Hz on output. These solutions are generally very expensive, and it is usually more cost effective just to replace the tool or appliance. See here for a high current frequency conversion solution. \nIf these solutions, for one reason or another, do not work then there are only two further choices: dispose of the appliance or tool, or attempt to operate the appliance or tool at 50Hz and in the process potentially create a situation where the power supply or the motors in the appliance or tool are rendered non-operational.
391098
i am assuming you are trying to minimize losses in a utility distribution system...when i was a system engineer at a utility..the quickest payback items were 1)correcting power factor as close to unity as possible with switched capacitor banks 2)have a policy of sizing distribution transfomers properly in relation to the load (i.e not oversized) to miminimize NL (no load) losses and not undersized too much either to minimize LL (load losses).\n3)size distribution feeder conductors to miminize both NL and LL losses.  The correct point at which you achieve max savings has a good bit to do with your %rate of capital as well as your cost of power both KW and KWH rates.
911276
I would ask at http://tomshardware.com in the forum under overclocking section.
926622
The CT will only work on an AC circuit so I don't see where it would make any difference.  The only thing that would is to have another phase too close and the magnetic fields might cancel each other. Since the current being measured is AC the output from the CT will also be AC and shouldn't matter on the leads.
326554
Disadvantages\nMany of the disadvantages of overclocking can be mitigated or reduced in severity by skilled overclockers. However, novice overclockers may make mistakes while overclocking which introduces many avoidable drawbacks.\n\nGeneral disadvantages\nThese disadvantages are unavoidable by both novices and veterans.\n\nThe lifespan of a processor is negatively impacted by higher operation frequencies, increased voltages and heat. However, the effect of operation frequencies and voltages has not been proven to be a major factor in processor lifespan. An experienced overclocker would have taken steps to ensure operation within safe temperature ranges. Moreover, with the rapid obsolescence of processors coupled with the long life of solid state microprocessors (10 years or more), it is argued that the processor will be replaced before any threat of failure. \nAn increase in clock speeds and sometimes voltages results in higher power consumption and a higher power bill. \nWhile systems may be thoroughly tested for stability before usage, stability problems may surface after prolonged usage due to an unusual workload or untested portions of the processor core. Although this is rare, such incidents may result in data loss. \nAn easy method of managing heat is the use of high performance fans which produces a high amount of noise. A popular make of fan for overclockers, the delta focus flow, can produce 50 decibels or more. This is unacceptably loud for a desktop computer for prolonged use. Properly managed, this issue can be reduced by utilising strategically placed larger fans which deliver more performance with less noise, or by the use of alternate cooling methods. Quieter options for overclockers include liquid and phase-change cooling. \nOverclocking will not necessarily save money. Non-trivial speed increases often require premium cooling equipment or running components at an unacceptably high temperature. It can also become an expensive pastime. Most people who consider themselves overclockers spend significantly more on computer equipment than the average person. As always, it is important to spend money prudently, by purchasing components that would alleviate the greatest bottlenecks or roadblocks to higher frequency operation. \n[edit]\nDisadvantages of overclocking by novices\nIncreasing the operation frequency of a component will increase its thermal output in a linear fashion, while an increase in voltage causes an exponential increase. Furthermore, semiconductor physics dictate that higher temperatures results in a higher resistance. Improperly managed, a novice may cause chip temperatures to rise so quickly that a permanent decrease in life expectancy or irreversible damage is caused to the chip. \nWith the advent of ever wider ranges of voltage options on motherboards, the risk of fire or burns is not tiny. The chip itself, or power mosfets may burn and capacitors may burst. \nMore common than hardware failure is instability. Although the hardware is not permanently damaged, this is inconvenient and could cause data loss. In rare, extreme cases entire filesystem failure may occur, causing the loss of all data. (If specialized recovery tools are not used) \nThe indiscriminate use of powerful fans usually creates a lot of noise. Novices may add too many fans in incorrect positions. Without proper thought to placement, turbulence and vortexes may be created in the computer case, further aggravating the situation without much increase in cooling. In addition, improper mounting may cause rattling or increased vibration. Some people do not mind the extra noise, and it is common for overclockers to have computers much louder than stock machines. Quieter options for overclockers include liquid and phase-change cooling. \nImproper installation of exotic cooling solutions like liquid or phase-change cooling may result in failure of the system, which may result in water damage or damage to the processor due to the sudden l
627352
on newer mainboards no settings have to be changed. assume you want to upgrade from a Pentium 4 630 (3GHz) to a Pentium 4 660 (3.6GHz), the mainboard recognize the new CPU automatically due to the CPUID (this is an identfication code within the CPU). The multiplier of the clock frequency will then automatically be set from 15 to 18 (x 200MHz).
970234
try AC BELL / Thermal Take.\n\nAC BELL's a Power Supply brand specialist for Branded / Home Made CPU, such as MAC, Fujitsu, HP, etc. But I Forgot the exact URL.\n\nBut for thermal take, try this
82587
You guys are both right--good answers.  Junction temperature also can affect the voltage drop.
519299
Lower voltage means less electrical pressure, so likely less power consumption.\n\nProbably what you are seeing is line voltage fluctation due to induction devices coming on-line (motors, fluorescent lights, etc.)  Induction devices cause a power phase shift ("power factor") which definitely cause a negative power impact (higher kWh).\nWhen it gets bad enough, the power company will make you install capacitors to counteract the inductive load.  \n\nWhen the phase shift reaches 90°, all power goes into oscillating the current (and making heat) and none into the load.
346802
Dude U got a faulty UPS n most prbably the primary chipset is goofin up\nU shud definitely go for a new good company UPS that has voltage stablization coz it holds the lifeline for ur PC
913471
In a purely resistive circuit, the power factor (PF) is 1 and you *can't* adjust it.\n\nAnd, since this is the 3'rd time you've asked the question and gotten the same answer from one other person and myself, do you even know what 'Power Factor' *is*?\n\n\nDoug
844366
Hmm, I think it's simple addition. The cores are all identical. So if pushed to the limit, it should perform *close* to three times the original, namely 3.2 x 3.
200572
Do you think those would help?\n\nhttp://scholar.google.com/scholar?q=design%20of%20a%20Lithium%20Niobate%20modulator%2040%20gbps&num=20&hl=en&lr=&safe=off&rls=GGLR,GGLR:2005-38,GGLR:en&oi=scholart
797208
Not the easiest thing to explain via email but the best way to start is to understand clearly the function of the symbols shown in diagram. Once you understand what each item does find a starting point - usually the power supply and walk through it. ANother way is to get the corresponding termination diagram. I find them much easier to understand.