Since most airplanes use Hz power, their devices and components can be easily replaced. Airplanes use Hz power because it reduces their total weight while also providing standardization of their electrical devices and components. When researching some of the different types of washers used in the aerospace industry, you may We use cookies to improve your experience.
By your continued use of this site you accept such use. For more information, please see our privacy policy. Monroe is committed to customer satisfaction, we strive for Continuous Improvement in our products and our people. Read More. Call Us: Skip to content. Large aircraft electrical systems usually use Hz alternating current AC , while common household electrical outlets deliver AC at 50 or 60 Hz. Why the difference? Induction motors turn at a speed proportional to frequency, so a high frequency power supply allows more power to be obtained for the same motor volume and mass.
Transformers and motors for Hz are much smaller and lighter than at 50 or 60 Hz, which is an advantage in aircraft and ships. Transformers can be made smaller because the magnetic core can be much smaller for the same power level. So why not use Hz everywhere? Such high frequencies cannot be economically transmitted long distances, since the increased frequency greatly increases series impedance due to the inductance of transmission lines, making power transmission difficult.
Consequently, Hz power systems are usually confined to a building or vehicle. Further discussion of aircraft electrical systems. Further, further discussion of aircraft electrical systems. Added: cool discussion of the use of hz with Cray supercomputers on another S.
Sign up to join this community. The best answers are voted up and rise to the top. Centralised power systems while cheaper to construct, do have several disadvantages. These include the balancing of the system, maintaining adequate voltage drops amongst others. Where fixed ground power is not available, mobile power units can be deployed.
These are typically towed or mounted on vehicles and deliver power by utilising diesel generators. The amount of kVA required is dependant on the aircraft type and size.
During design processes, the amount of power required is calculated and suitable equipment installed. For point of use converters see blow , these are often standardised as 90 kVA units. For HZ systems, the impedance will be around eight times larger than normal mains systems and consequently voltage drop becomes a major issue.
In addition for normal four core cables, the distance between the centres of each phase is not equal [due to the neutral conductor taking up space in the image a3 is larger than a1 or a2 ].
This creates an imbalance and consequently the inductance of each phase varies. This variation of inductance between phases, while not that important at mains frequency, become more pronounced at Hz and can lead to imbalanced voltages.
To reduce any imbalance in inductive reactance, often special symmetrical seven core cables are used - with interspersed phases wrapped evenly around a neutral conductor. Generators providing Hz power use less copper in their windings and smaller magnetic cores than those of 50 or 60 Hz - making them lighter. Given the relative short transmission distances in aircraft, the negative aspects of larger voltage drops at Hz are not so serious.
The reduction in weight of equipment more than compensates for this. Maintaining V at the aircraft plug in connector can be difficult; this is especially so where each phase is unbalanced.
Several methods exist for ensuring the correct voltage level at the aircraft. Two methods which yield reliable results for point of use converters are:. Commercial mains power at most airports operates on either 50 or 60 Hz. Frequency converters are required to change this to the Hz required for aircraft operation. No break power transfer: most modern aircraft operate a no-break power transfer. The special circumstances in airport: aircraft generators require small size, light weight, the only way to meet the power requirements is to increase the frequency, so the corresponding electrical equipment on airplanes should be Hz, and aircraft-related power supplies is Hz , military uses even higher frequency.
Aircraft power supply uses Hz is in order to reduce the size and weight, it is a complex system. In case of same voltage, what are the differences of 50Hz, 60Hz and Hz power supplies in transmission and efficiency? The reason of not using Hz or Hz is due to the high frequency, on the one hand, the transmission will be difficult; on the other hand, it's inadvisable to increase the speed or poles of the generator and electro motor.
You have no items in your shopping cart. Blog Tags. Why we use 50Hz, 60Hz or Hz frequency? Leave your comment Registered user only.
So pleace correct list Norway 50hz. Thank you! Frequency, a wave that cuts one second into a regulated space and then attends to count the highs and lows within a frequency. I can image this occurring, and thus I grow! What is the benefits if we use HZ motors?
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