Electrical Engineering

36 months may be optimistic, but it is believable from the point of starting construction to going critical. The reason a lot of plants took a long time was due to weaknesses in the licensing process allowing for interruptions and delays at many junctures. This increases construction time and drives up costs substantially.

New regulatory procedures are in place to hopefully reduce this occurrence. For instance, the reactor design is licensed separately and before the plant is built, and there are set time periods for public debate.

Let me just elaborate some on what BCRion has said.

The licensing process in the USA is a two step process. First the utility applies to build
the plant; an action that can be, and frequently is; challenged in court. After a protracted
period of lawsuits and public comment - the construction permit is granted and the utility
can build the plant. After the plant is constructed, the utility has to apply for an
operating license; and the whole process - lawsuits and all, questioning whether the plant
should even exist; starts all over again.

Can you imagine building your home in such circumstances? You convince all the zoning
boards and planning boards that your house will be acceptable to the community and
obtain your building permit. Then after properly construction the house as per the permit,
and as verified by the building inspector; you would then have to apply for a permit to
actually inhabit the house. During this second permitting process; anybody can challenge
any of the features and siting of the now completed house.

That's the way nuclear power used to be licensed in the USA. The Congress has done
some reform of the laws. Hopefully they have instituted a sensible process for licensing
new reactors.


Added- All said and done it takes about/at least 10 years, beginning to end. Including all the licences and permits.

Moisture causes problems in transformers, and is not desired. Pulling a vacuum causes the moister in the oil impregnated paper and nonmetallic supports to evaporate, and as the vacuum is held, this moister can be removed.

economy of force

Yes, a 415V motor can typically operate on a 440V system, as the voltage difference falls within an acceptable range for many industrial motors. However, running the motor at a higher voltage can increase its speed and torque, and may lead to overheating or reduced lifespan if not properly managed. It's essential to check the motor's specifications and consult with a professional to ensure safe and efficient operation.

5 hp equals 3730 watts, and on a 3 phase 480 v system the line voltage is 277, so the current times 277 times 3 equals 3730. The answer in theory is 4.5 amps.

But you have to allow for 10% power-loss in the motor, and also the power factor, which could be 0.8.

Therefore the current is probably 6 to 6½ amps. Maybe 10 amps on starting up.

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The formula you are looking for when amperage is desired when horsepower is shown is - I = HP x 746 / 1.73 x volts x % efficiency x power factor.

A standard motor's efficiency between 5 to 100 HP is .84 to .91.

A standard motor's power factor between 10 to 100 HP is .86 to .92.

Amps = 5 x 746 = 3730/1.73 x 480 = 3730/830 x .84 x .84 = 3730/586 = 6.37 amps. Starting current will be 300% of the motors run current.

Double circuits can carry more power. Also, double circuits introduce a level of redundancy, so that if a single circuit (half of the double circuit) fails, the other half is still intact.

called an insulator

10V

Before you can understand how electrical energy is supplied by your electric company, you need to know how it is produced. A magnet and a conductor, such as a wire, can be used to induce a current in the conductor. The key is motion. An electric current is induced in a conductor when the conductor moves through a magnetic field. Generating an electric current from the motion of a conductor through a magnetic field is called electromagnetic induction. Current that is generated in this way is called induced current. To induce a current in a conductor, either the conductor can move through the magnetic field or the magnet itself can move.

You have to wire both the run and start windings. The start windings will automatically be removed from the circuit once the motor is at 75% of normal speed. The start winding gives you more torque to start the motor.

A current checks less resistance path to flow. When one of parallel branches is shorted, it becomes have less resistance and whole the current will flow through it, means current before parallel branches and current after parallel branches becomes same, and all branches become short.

To measure high voltage use suitable instrument transformer (potential transformer)

Very carefully. It can kill you. The higher the voltage the more the danger or arcing over even when two conductors are not touching. Voltage meters are rated and the rating should not be exceeded. Depending on the voltage you will need the proper meter and a high voltage probe rated for the voltage you are measuring. If you don't know what you are doing, don't mess with high voltage. Leave to the pros.

Yes! A socket is a part of a circuit. Usually there are a number of sockets and lights associated with a specific circuit. The wiring of the circuit and the circuit breaker are limited to a specific amperage. If you exceed the amperage, you can blow the breaker. If the wire is rated for 15 amps and the circuit breaker is rated for 20 amps, the wires can overheat and cause fires.

current in series depends on values of resistors. more resistance less current will flow through and viceversa

The speed of DC motors need to be controlled because that is what the application needs. In some cases, it is to protect the motor or the attached equipment. In toys and robots, you'd want different speeds. Electric cars such as golf carts would need to control the speed of a DC motor so you can easily drive it like driving a car with a gasoline engine.

Tape recorder motors contain a flywheel and a governor to regulate their speed so the tape will move at an even and standard rate. If the motor starts to get a little too fast, its contacts inside open up to briefly power down the motor and when it is slow enough, the contacts close again. So this helps to compensate for different amounts of battery charge and for different operating conditions.

Record players have a simpler job of regulating their speed since most use alternating current and a simple induction motor. Since the voltage and frequency is constant, no governors are needed. Unless the bearings go bad, the motor will run at that fixed rate.

The heart of a nuclear power plant is the nuclear reactor.

Xc(capacitive reactance) = 1/(2piFC)
XL(inductive reactance) = 2piFL
Where pi=3.14etc.,
F=frequency and C and L are capacitance and inductance.
Please pardon lack of proper symbology.

Step down transformer, potentiometer or rheostats can all be used to reduce voltage.

The live wire in the supply cable carries current from the power station to the electrical device that you want to use. The current returns to the power station through the neutral wire in the supply cable.

For safety reasons, on some electrical equipment there is also a ground wire - also known as an earth wire. It is connected to any metal parts on the outside of the unit, such as a metal case, and to any internal metal chassis, motor framework, etc. The ground wire is necessary to conduct away the current which could otherwise kill someone if a fault or an accident happens which damages the insulation of the live wire so that it touches any of those metal parts and gives them a high voltage. That would be very dangerous to the human users of the equipment.

The spinning magnet in generators.

Add up your amps to calculate your breaker size.

Add up your loads (amps), divide by 0.8, and choose that size breaker. If that number does not correspond to a standard size breaker you go to the next higher standard size breaker.

The formula for the electric current can be given as I= Qt where Q refers to coulomb charge and t= amount of time in second . By applying this formula the amount of current passing through the conductor can be known foor any instant of time. For any conductor the amount of charge is always constant.

Current measures the flow of moving charge per unit time. Therefore the formula for current is I=Q/t as the unit of current is C/s (Coulomb's per sec) or amps (A).

Three Phase conversion from KW to Amps, but you have not supplied enough info. Use whatever formula below works with the rest of the data you have.

E =VOLTS P =WATTS R = OHMS I =AMPS HP = HORSEPOWER

PF =POWER FACTOR KW = KILOWATTS KVA = KILOVOLT-AMPS

EFF = EFFICIENCY (decimal)

When P, E and PF are known: P / E x PF x 1.73

When HP, E, EFF and PF are known: HP x 746 / E x EFF x PF x 1.73

When KW, E and PF are known: KW x 1000 / E x PF x 1.73

When KVA and E are known: KVA x 1000 / E x 1.73