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Can 3 phase electric motors be reversed by an electrical storm?
Wiki User
∙ 14y ago
Not directly. But if the linemen are reconnecting a three phase line that has been blown down and are not paying attention when the line goes back up the phasing could be changed. All it takes to reverse three phase is the interchange of any two of the three lines. On a job in St. Lucia in the Caribbean we had to put phase reversal monitors on all the equipment we installed as this actually happened once.
Wiki User
∙ 14y ago
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What do you mean lagging in electrical?
Lagging means the current is out of phase, lagging behind, the voltage. This occurs when there is inductive reactance in the circuit, such as with motors and transformers.
What is the principle of a three-phase induction motor?
An electric motor converts electrical energy into a mechanical energy which is then supplied to different types of loads. A.c. motors operate on an a.c. supply, and they are classified into synchronous, single phase and 3 phase induction, and special purpose motors. Out of all types, 3 phase induction motors are most widely used for industrial applications mainly because they do not require a starting device. A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections. The operating principle of a 3 phase induction motor is based on the production of r.m.f.
What is an ac motor?
An AC motor is an electric motor that runs on alternating current, like household electricity, as opposed to a DC motor that runs on direct current from a battery. Most AC motors work from the mains supply, which has a frequency of 50Hz in the UK and 60Hz in the USA. Other types are available that work like stepper motors and need a specialist supply to run them.
What is a generator?
A generator is an electrical machine that produces electricity. It must be turned by a prime mover that can be an internal combustion engine (driven, usually, by diesel oil or gasoline), or it can be a turbine, driven either by superheated steam or by water falling from a reservoir. (The latter is known as "hydro-electric power generation.")Before today's solid-state voltage inverters were invented, electric motors were often used to drive generators to produce a different type of electrical power (for example, to produce dc power from an ac service or to produce 3-phase ac power from a single-phase ac service).For more information, see the answers to the Related Questions shown below.In electricity generation, a generator is a device that converts mechanical energy to electrical energy for use in an external circuit. The source of mechanical energy may vary widely from a hand crank to an internal combustion engine. Generators provide nearly all of the power for electric power grids.The reverse conversion of electrical energy into mechanical energy is done by an electric motor, and motors and generators have many similarities. Many motors can be mechanically driven to generate electricity and frequently make acceptable generators.
Is there a difference between three phase and single phase electrical supplies?
Yes, there a difference between three phase and single phase electrical supply services.
What does P1 stand for in electrical wiring?
P1 is where you hook L1 on electric motors. Typically used on 220v motors in the wiring diagram. P1 (phase 1) gets connected to L1 (power leg)
Why would three phase be used instead of single phase?
Three phase electricity is used instead of single phase for industrial situations. Industries use three phase electricity instead of single phase to operate electric motors driving heavy machinery. Three phase electrical motors produce more power from the same amount of electricity and maintain steadier speed. Small portable motors such as drills and mixers use single phase. Motors used around the house are single phase. Motors used to run large industrial machines use three phase.
What would cause an electric motor to run backwards?
Motors running backwards: A DC motor wired backwards or magnetic field reversed. A 3 phase AC motor with 2 phases reversed A single phase motor will run either way unless it is 'persuaded' by means of a shaded pole or other method to rotate in a particular direction.
What has the author Eugene A Klingshirn written?
Eugene A. Klingshirn has written: 'Analytical and experimental study of high phase order induction motors' -- subject(s): Automobiles, Electric, Electric Automobiles, Electric motor vehicles, Electric motors, Induction, Electric propulsion, Equivalent circuits, Induction Electric motors, Induction motors, Stators
Give three reasons why AC three-phase system is used universally in the electricity public utility supply?
1. 3 phase is more efficient for electric motors. 2. Electric motors start easier with 3 phase. 3. Less current draw 4. Less heat is produced that is waste.
What has the author Lester Eugene Stutz written?
Lester Eugene Stutz has written: 'The design of an induction motor, single phase double current generator set' -- subject(s): Electric motors, Induction, Induction Electric motors
How do you reverse the direction of rotation of a ceiling fan by changing the connections?
You can't. All single phase motors can only rotate in the direction in which they were manufactured. That is either clockwise or counter-clockwise. Only three phase motors can be reversed by changing the connections. Most ceiling fans have two sets of wiring in their motors so that a direction switch determines which way the fan rotates.
Why is electricity generated as 3 phase?
It is more economical especially for running motors. Most motors start much better with 3 phase service. It also takes less current than single phase for a motor to run, therefore the power meter spins less for electrical cost.
What do you mean lagging in electrical?
Lagging means the current is out of phase, lagging behind, the voltage. This occurs when there is inductive reactance in the circuit, such as with motors and transformers.
What are three phase motors?
Three phase motors are motors which operate under three phase supply.Each phase is displaced from one another by 120 degrees.It produces three fluxes which are also 120 degrees displaced.
Is there an advantage to changing to a 3 phase system if we have no 3 phase motors or ACs in our load?
None what so ever. The cost of changing all of your equipment and new service would be high. The electrical bill is based on wattage used be it single phase or three phase.
What is the principle of a three-phase induction motor?
An electric motor converts electrical energy into a mechanical energy which is then supplied to different types of loads. A.c. motors operate on an a.c. supply, and they are classified into synchronous, single phase and 3 phase induction, and special purpose motors. Out of all types, 3 phase induction motors are most widely used for industrial applications mainly because they do not require a starting device. A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections. The operating principle of a 3 phase induction motor is based on the production of r.m.f.
