Electrical Engineering

Ohm's Law states that Voltage = Resistance (Ohms) * Current (Ampere).

So when you increase voltage, you increase current.

trefoil arrangements of same phase mimimise stray loss

the north pole magnet and straight rod present in the moter .the current flow in the rod and rod rotate on the magnetic force.And the moter run.

V=I*R OR

R=V/I OR

I=V/R

AT constant temperature

Clutter Improvement factor is defined, formally, as the ratio of output SCR to input SCR which works out to be a product of clutter attenuation and signal gain. It is a measure of a systems rejection capabilities of clutter power as a function of Doppler frequency.

High frequency power transformer as a product (ie goods) starting, that its design principles and requirements, and describes its design process. Keywords: High frequency power transformer; design principles; located Abstract: The high-frequency power transformer as a product (ie goods) starting, that its design principles and requirements, and describes its design process. Keywords: High frequency power transformer; design principles; design requirements; design process features a foreword power transformer is the power transfer, voltage transformation and isolation isolation, as a major soft magnetic components, power supply and power electronics technology been widely used. Transmission power according to the size, power transformers can be divided into several files: 10kVA or more for the power, 10kVA ~ 0.5kVA is in power, 0.5kVA ~ 25VA for the low-power, 25VA Following is a micro-power. Different transmission power, the power transformer design are not the same, should be self-evident. It was based on its primary function is the power transfer, the English name "Power Transformers" into "power transformer", in many documents and data are still in use. What is called "power transformer" or called "power transformer" is good? Science and technology terminology to be authority to select the decision. With an English name "Power Transformer", also translated as "power transformer." Power transformers used for power transmission and distribution system from the power transmission, voltage transformation and isolation insulating effect than the primary voltage is 6kV high-voltage, power minimum 5kVA, the largest over the million kVA. Power transformers and power transformers, although the working principle is based on the principle of electromagnetic induction, but both stressed the power transmission transformer big, but also stressed the high isolation voltage insulation, both in the **** coil, or the insulation structure design, with the power to send small , insulation and low voltage power transformer isolated significant differences, but can not be designed to optimize the design of power transformer condition mechanically applied to the power transformer to go. Power transformers and power transformer design method is not the same, it should be self-evident. High frequency power transformer is the operating frequency over frequency (10kHz) power transformers, high frequency switching power supply is mainly used for high frequency switching power transformers, but also for high-frequency and high frequency inverter power supply for high-frequency inverter welding machine inverter transformer. According to the level of the operating frequency can be divided into several grades: 10kHz ~ 50kHz, 50kHz ~ 100kHz, 100kHz ~ 500kHz, 500kHz ~ 1MHz, 1MHz or more. Larger transmission power, the operating frequency is relatively low; transmission power is relatively small, the operating frequency is relatively high. Thus, both the frequency difference, there are differences in transmission power, frequency of different grades of power transformer design is different, it should be self-evident. As noted above, of the high-frequency power transformer design principles, requirements and procedures are error concept, but in early July 2003, read "Application of Power" 2003 No. 6 specifically recommend two high-frequency magnetic components Design article, had doubts and felt some issues worthy of further discussion, it was to write this article. As the "power technology," Editorial put it: "concrete analysis of concrete situations," the purpose of writing is to try to detail and selection of the most difficult component of the magnetic high-frequency power transformer design to clarify . The place where it is wrong, please correct me by several authors and readers. 2 high-frequency power transformer high frequency power transformer design principles as a product of natural products with the properties, so high-frequency power transformer design principles and other commodities, is done under the specific conditions of use in the pursuit of specific performance of the functions price than the best. Emphasis on performance and efficiency may sometimes, sometimes emphasis on price and cost. Now, light, thin, short and small, to become the development direction of high frequency power supply is that of cost. Which became a major difficulty of the high-frequency power transformers, but more efforts in this regard. Therefore, high-frequency power transformer "design features" a text, talk about performance, not talk about the cost, can not be said to be a major shortcoming, if you will seriously consider the principle of high-frequency power transformer design, the pursuit of better performance and low cost to send less than 10VA the chip switching power supply high frequency transformers, should be designed lighter, thin, short, small programs. Cost aside, the market value of the law is merciless! Many properties of a good product, often because the price can not be accepted by the market who were left out and eliminated. Often the cost of a new product was finally rejected. Some "saving money is not festival" products why not open the market to promote worth pondering. Product cost, including not only material costs, production costs, including research and development costs, design costs. Therefore, in order to save time, based on past experience, high-frequency power transformer iron loss ratio of copper losses, leakage inductance and magnetizing inductance ratio, primary and secondary winding loss ratio, the current density to provide some reference data, the extent of the window fill winding wires and structure to some of the programs, what is wrong? Why must progressively projected back and forth and simulation, it is not the concept of error? Of 80 years in the 20th century to develop high-frequency magnetic amplifier switching power supply to the lowest temperature conditions, optimized high-frequency power transformer design. Difficult to determine the thermal resistance, a far cry from the sample results and trial had again amended. Now some of the company's **** product specifications in order to reduce the user time high-frequency power transformer, and some simplified design formulas are listed, some with the table lists the **** operating frequency in a certain transmission power. This not only for the sake of users, but also to promote the company's products win-win behavior is entirely consistent with the behavior of market rules, not what is needed misconceptions Analysis. The problem is to provide reference data, the recommended solution is a summary of experience? There is no universal? Including the "Analysis" article to some of the claims, we need proven to hold water. In short, do keep in mind: high-frequency power transformer is a product (ie, commodities), the design principle is to be completed under the specific conditions of use of specific functions in the pursuit of best price performance. The sole criterion for testing the design is to design products that can withstand the test of the market. 3 high-frequency power transformer design requirements to design principles as a starting point, you can make four high-frequency power transformer design requirements: Conditions, completion, improve efficiency and reduce costs. 3.1 Conditions of Use Conditions of Use, including two aspects: reliability and electromagnetic compatibility. Previously only pay attention to reliability, since the increased awareness of environmental protection, must pay attention to electromagnetic compatibility. Reliability refers to the specific conditions of use, high-frequency power transformer can work to life so far. General Conditions of Use of High Frequency Power Transformer is the biggest environmental temperature. Some soft magnetic materials, relatively low Curie point, temperature sensitive. For example: Mn-Zn ferrite, the Curie point only 215 ? the magnetic flux density, permeability and loss changes with the temperature, so the addition to the normal temperature of 25 ? but also gives the 60 ? 80 ? 100 ? a variety of reference data. Therefore, Mn-Zn ferrite **** of the operating temperature limits below 100 ? which is the ambient temperature is 40 ? the temperature rise of only less than 60 ? the equivalent of A-temperature insulating materials. Mn-Zn ferrite cores with the matching pieces of magnet wire and insulation, are generally used E-class and B class insulation material, the use of triple H class insulation magnet wire and polyamide insulating film, is not overkill? Costs how much? H class insulation is not because of the high-frequency power transformer design optimization can make the volume reduced by 1 / 2 to 1 / 3 the reason? If yes, please give specific examples of data. Development of the H class insulation has frequency 50Hz, 10kVA dry-type transformers, and insulation class B frequency 50Hz, 10kVA dry-type transformers compared to volume decreased 15% to 20%, is already quite substantial. Have been relatively small volume of high-frequency 100kHz10VA high frequency power transformers, such as the secondary windings are triple insulated wire, can reduce the size of 1 / 2 to 1 / 3, it must be a very valuable experience. Detailed information about optimal design of programs for readers to learn.

That is an open line.

short circuite means phase to phase,three phase short, phase to earth, three phase to earth, this is all short circuite

application of multi door calling bell

See the related links for two ways to do it.

In an induction motor, a rotating magnetic field is sent sideways through the walls of a copper cylinder. The field cuts the copper, generating a current in it, and also a powerful magnetic field, and the magnetic field in the copper repels the rotating field. This 'pushes' the copper forward, making the coper try to move. If the copper cylinder is able to spin freely, it will coast along at a slightly slower speed than the rotating field, as the moving magnetic field has to keep 'cutting' the copper to create the other magnetic field. In this case the rotating cylinder is not doing any work, since no energy is being used to drive a load. It's just coasting frictionlessly.

If we place a friction load upon the motor shaft, (add a washing machine,) then the copper cylinder will slow down in the magnetic field moving through it. In this case the magnetic field is cuts the copper faster, generates more current and flux, and pushes the copper along harder, so the device becomes a motor. Energy from the rotating magnetic field sets up an opposite field in the copper cylinder, and drives it forward.

If instead we *drive* the copper cylinder forward, making it spin at a faster speed than the moving magnetic field, then the copper cylinder will push the field forward, creating a rotating field in the copper, and this generates electrical energy in the coils.

So for a 2-pole motor running at 60Hz, it becomes a motor if it spins slower than 3600RPM, and it becomes a generator if it's spun faster.

Here's a second way to visualize things: the rotating copper cylinder generates its own trapped magnetic field. This means that the copper cylinder is itself a magnet. If this magnet is allowed to spin freely, then it will turn at exactly the same rate as the magnetic field from the coils. Then if we grab the motor shaft to try to slow down the spinning "copper magnet," the poles of the magnet within the copper will lag behind the moving magnetic poles from the coils, and the coils will pull the copper strongly forward. The "copper magnet" doesn't need to slow down, but instead it will suck energy out of the coils as its gets dragged forward by the moving poles from the coils. On the other hand, if we try to spin the "copper magnet," it won't turn faster. Instead its poles will get ahead of the moving poles of the coils, and it will inject electrical energy into them, and drive the mains with this energy. In other words a moving magnet can generate a current in a nearby coil, *OR* a current in a coil can force a nearby magnet to start moving. All motors are generators and all generators are motors. It just depends on which side is driving forward and which side is being dragged along.

If induction motors and generators make your brain hurt, just remember that there's a good reason for this. They weren't invented by a bunch of engineers. Instead they sprang from the twisted mind of Nikola Tesla, who no doubt could ride along with his mental squirrel-cage rotor while seeing how the fields and currents behaved.

NO! NO! NO! The circuit breaker must be rated for the line voltage used. Exceeding this limit can cause catastrophic failure! If you are really working on a 1600A bus, stop right now, ang go hire a professional! Your question indicates you are not qualified to work on this gear. YOU ARE GOING TO KILL SOMEBODY. I'm not kidding about this. A breaker that is applied beyond its rating can arc over, and the resulting arc-flash can punch right through the panel cover, spraying vaporized metal on anyone unfortunate enough to be standing there. A 1600A bus can have a fault current of 20,000A OR MORE. This is not something to even think about working on unless you are trained and absolutely know what you are doing!

Its is a type of Variable frequency drive which uses concept of dynamic braking to generate a feeding back power , once the brakes are applied to a electric motor , the energy is usually dissipated as heat inside the electric motor in all the regular VFD's but instead this Regenerative unit passes on this energy into a resistor , from which it is converted into electricity, which is of fen fed back to the system , resulting huge power saving , but this also depends on the load and the number of time brakes are used in an application ,

this is of fen called in different names like Regenerative AC drives, Regenerative VFD'S (in short form)

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Usually the way you play the notes are different. so the answer would be yes the note is different.

An impedance triangle has resistance (always positive) in the x axis and reactance (at a right angle to resistance) in the y axis. The line that completes this triangle (the hypotenuse) is the absolute value of the impedance.

Circuits need 3 things to work. They need a load, (what the power goes on) power source, (the battery) and connectors (the wire inbetween). Circuits use electrons to flow from the negative side of the battery and around the circuit back to the battery. This repeats until the circuit breaks.

OLTC - INSTALLED IN THE PRIMARY SIDE OF A POWER TRANSFORMER TO SELECT OR ADJUST VOLTAGE. THE ADVANTAGE OF THIS IS FOR SOLVING THE VOLTAGE DROP ISSUES IN THE SECONDARY OUTPUT IN THE FARTHEST LOCATION. FOR EXAMPLE YOUR SECONDARY VOLTAGE REQUIREMENT IS 380 VOLTS AND YOU CAN ADJUST TO 400 VOLTS FOR LONG CABLE RUNS.

No. You can help fire proof a building. But there is always a chance it can catch on fire somehow. Fire sprinklers are only used to keep the fire under control so it doesn't spread...they are not used to put the fire entirely out. Firefighters are for that. Anything that you use to fire proof a building is only used to keep the fire under control until the Firefighters arrive.

The closest you can get to a fireproof building is a brick one with a terracotta tile roof.

Gang capacitors are a series of capacitors that are mounted to a common location. When they are mounted in series, they can be controlled by a single switch instead of multiple ones.

J = ρ.u

Where

J = Current Density (Ampere per meter square) ρ = Charge Density (Coulombs per cubic meter) u = Particles average drift velocity (meters per second)

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