Fecn
06.05.2021 7:30:18
How does one produce and control this magnetic field in a large generator?
See full version: Excitation in Power Plant Generators: Brief Overview
How does one produce and control this magnetic field in a large generator?
In the past, the exciter was a small DC generator coupled to the same shaft as the rotor. Therefore, when the rotor rotates this exciter produces the power for the electromagnet. Control of the exciter output is done by varying the field current of the exciter. This output from the exiter then controls the magnetic field of the rotor to produce a constant voltage output by the generator. This DC current feeds to the rotor through slip rings. more
The rotor or the field coils in a generator produce the magnetic flux that is essential to the production of the electric power. The rotor is a rotating electromagnet that requires a DC ( Direct Current) electric power source to excite the magnetic field. This power comes from an exciter.
During start up, when there is no output from the generator, a large battery bank provides the necessary power for excitation.
These are just a few points to think about when it comes to using a generator and living off the grid. Watch out for an upcoming post on what to do when you're generator won't start. Something we've experienced a few times, usually when it's -30 degrees Celsius or colder out.
There's no easy answer to this question as it depends on a whole lot of things. Your family size and how often you and your family use energy-hungry tools or appliances. How much wind or solar power you get. And also the season. [links]
Some of our favourite electric equipment and tools are just power hogs. Like our lake pump and our washing machine. [links]
And after some time, you'll find that they just don't hold their charge as well or as long as they used to. So you have to equalize them by overcharging them, which takes a lot of power. Often it needs far more than our solar panels can provide. So we use our generator. [links]
We use solar panels to charge the batteries that power our off the grid home. But when we don't get enough sunlight, we use our generator to charge our batteries. here
Generators for home use are usually either emergency/occasional use generators for use during power outages, or generators to use as a regular backup for properties off the grid. more
Most people don’t truly understand generators to the extend they should, especially if they use them on a regular basis. Or, maybe you’re just curious about how generators work. Well, we know a lot of you have questions so we put together this article to explain some of the most common question people are asking, such as:
From the above example, we can look at a generator in the same way as we do a water pump. A pump adds energy to water molecules, causing them to flow. A generator adds energy to electrons, causing them to flow. So how does a generator energize electrons?
How does an inverter generator work? [links]
Generators turn mechanical energy into electrical energy by moving electrical conductors in a magnetic field. Excitation creates the electromagnetic field to make this mechanical to electrical conversion occur. Emerson’s Rich Dennis provided a basics presentation on excitation control at the 2017 Ovation User Group meeting.
A generator has a prime mover like a turbine or diesel generator. The excitation system creates the electromagnetic field in the rotor. The stator has the armature winding that has the electrical energy induced.
Field breakers are used to protect both the AC and DC sides of the generator. Power rectifiers convert AC power to DC power. Cooling systems maintain operating temperatures required for reliable operations. Field discharge system is required to remove the energy from the rotor while the mechanical power source is slowing down. The field flashing equipment is used to generate the initial electromagnetic field until the generator creates enough voltage to self-excite and sustain the mechanical to electrical power conversion. [links]