Efficient high current dc relay for High-Risk Applications
Reliable high current dc relay Designs for Industrial and Industrial Applications
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ChunkyMunky asked Does alternating current move or just rotate in the same location?
Electricity is transmitted with AC since it is more efficient than DC over long distances. Alternating current consistently and symmetrically(is it symmetrical?) changes direction, how does it get anywhere? How does the energy get from the source to the user if it is constantly retracing it's steps? Or are the electrons merely the carriers and the voltage applied passed along to the next set of electrons? Thanks for the help.
And got the following answer:
Actually, that opening statement is incorrect. Alternating current is not necessarily more efficient than DC at long distances. AC is used for a similar, but actually different reason. It is HIGH VOLTAGE that makes for long distance transmission of electric power, and of course you need LOW VOLTAGE at the destination. The CLASSICAL advantage of AC is that it functions with transformers, which can step up and step down the voltage level. Think of transformers as "electrical gears", that trade the voltage/current properties of an electric signal as needed. The product of voltage and current yields power, and this product is (roughly) preserved across the transformer, but the voltage level is traded for current. DC does not function with transformers, simply due to the nature of Faraday's law of induction relying upon CHANGES in magnetic field. If you attempt to send DC through a transformer, you will get nothing on the secondary side, and you will get a short-circuit on the primary side. In modern times, there exist DC equivalents of transformers. However, it is very costly to replace our grandfathered infrastructure with a DC overhaul. ------------------------------------- The deal with AC signals is that you shouldn't think of the actual charge carriers needing to get from source to load. That is a naive way to think about electricity. It isn't the charge carriers that carry the electrical power. It is rather the interaction between them that does. In otherwords, it is a RELAY. Electron A makes its move, and repels electron B. Electron B moves and repels electron C. On and on and on, until the circuit is complete. This is true for both AC and DC. Even in DC, if you actually follow the AVERAGE electron from source to load, you will notice that just to get through a meter worth of wire length, that it could take a month for the circuit to complete. Electron drift speeds (as calculated from current, wire size, and charge carrier concentration) are so slow that they are on the order of millimeters per hour. Why then can the circuit function? Because there are so many of them, and they relay the energy and information through electric repulsion. Think of sound waves as being analogous. When I talk, the air from my throat doesn't make it all the way to my listener. Otherwise he'd be thinking, "good lord that guy has bad breath". Instead, my vocal system pushes and pulls on the air in cycles of audio frequency, and these pushes and pulls propagate to push and pull on neighboring air masses. Same thing with AC. The AC source is pushing and pulling on the electrons at one of its terminals (and doing the reverse at the other terminal). These pushes and pulls of electrons propagate down the wire, and that is what delivers the energy and the information. "is it symmetrical?" In the case of a pure signal, yes. In principle, the voltage as a function of time takes a sinusoidal waveform, with equal amplitude and equal duration on both sides of zero voltage across the source. However, if the signal is distorted, which it indeed can be, there will be a roughness to the waveform. There could also be a duty cycle of more time spent on positive than on negative. There can also be a DC offset, which changes the midline voltage of the AC, and this can usually be accomplished by stacking a DC source in series with an AC source. If you get a function generator and an oscilloscope, you can see numerous variations on the simple pure sinusoidal AC signal.
The high current dc relay work really nicely with distinct applications which are particular to energy distribution and protection. The relays come with wide adjustment ranges having a scale that is definitely simple to study either in three or four digits in line with the model. These high current dc relay enable in escalating the flexibility on the applications, lessen the overall power and maintenance fees. There are relays which are utilized for common purposes which are available in reliable designs with rapid replacement selections. And you’ll find models which might be utilised for industrial applications and heavier duty applications that operate on big loads. These items are produced to meet the lifetime industrial handle wants with the applications.
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