Questions tagged [generator]

A generator is a device that generates electricity from mechanical energy via different energy sources such as heat or kinetic energy of water.

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11 views

Is there a difference between average actual load and the sum of all energy used? ~1000MWs unaccounted for

I am learning about energy markets and trying to understand a .csv file that shows multiple types of energy being used on the grid: solar, wind, hydro, nuclear. And the end column is the average ...
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22 views

Alternator's saturation in load and no-load conditions

When a ferromagnetic material is exposed to a magnetic field in which it moves, some voltage is induced in the material. If you increase the magnetic field, the voltage is increased up to a point, and ...
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Internal EMF of a Synchronous Generator Relationship with Load side line Voltage

Say you have a 6-pole, star-connected, 60 Hz, 25 MVA rated, 600 V synchronous generator. After conducting open and short circuit tests you get the equivalent circuit with Xs = 600/(root(3)*14000) (...
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87 views

Making a 12V charger/power supply from a brushless dc motor used as a generator

This is my first question here so if I have done something wrong question-wise iI would like to know. I am building a mini tractor with a small gasoline engine. I want to use a brushless DC motor from ...
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206 views

What can happen if the power factor of one generator becomes leading?

Please help with this. I have a generator which I loaded in parallel with other generators. I noticed that the power factor became exactly one and after a while leading. The other two generators had a ...
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Standard equation for delivered power from synchronous generator wrong for fractional kW machines?

When synchronous machines get to a certain size (in the \$MW\hspace{-0.8mm}s\$) the armature resistance is a lot smaller than the synchronous reactance, \$R_A << X_s\$, because of this \$R_A\$ ...
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The current that an AC3 contactor can support

I am constructing an ATS (Automatic Transfer Switch) for a diesel generator with a max current of 300 A. Now I already have an AC3 contactors with Ith = 100 A and I don't want to waste the money on ...
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Power generation and tuning

I’m building a generator and currently can output 413V AC at 120 Hz. Not sure of wattage or amperage yet. I assume a step down transformer can make 110V. How can I make it 60 Hz without changing ...
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Smart Power Restore Alarm

I have a portable generator I am going to use with an interlock system, which prevents back current to the grid, to power the house during outages. Knowing I would need a power return alarm to notify ...
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83 views

Why a voltage drop at the busbar's generator?

I was testing the effects of distributed generators on our grid. To do so, I inserted a PV generator of 90 MW PURELY ACTIVE (power factor = 1) as in the picture. I performed a quasi-dynamic simulation,...
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Why does the short circuit current increase when we connect a distributed generator?

I read that the short circuit current increases when we connect a generator to the grid. Why? Is this true for any kind of generator? (PV, wind turbine, synchronous generators, etc.)
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How to parallel two generators? [closed]

I want to know if its possible to power a food truck( park trailer) with 2 generators to provide 110/240 with no connection to shore power provided eliminating need for transfer switch... I assume 2 ...
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Motor/Generator Set Using Car Alternator

So I've recently been learning that car alternators are just three phase synchronous motors with external DC field excitation. To access the three phases it may be necessary to take them apart, ...
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Can we tell which way AC power is going through a cable without cutting the cable?

Assume we have a very long cable whose ends are not visible or accessible. One end we know is a generator, and the other a load. Can we determine which end of the cable has the generator attached ...
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Charging a 5v battery bank with 4.2 volt battery

So I wanted to make a hand-cranked battery charger for my power bank, and I figured that if I connect a generator to a lithium battery I had lying around, I could use the output of that lithium ...
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About using the Quad-copter motors as power generator (charging its battery when do nothing)

I am searching the Lego based quadcopter projects via google search it this project, like show below: So some quadcopter combining toughener to do bigger works, for example by combining some number ...
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Generator AVR - blue / yellow wire pairs

I'm replacing the automatic voltage regulator (AVR) on a Suntom 6500T generator (apparently identical to the more common Kipor KDE6500T and other generic Chinese 5.5kW generators). The original AVR ...
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Is it viable to short pitch different windings by different degrees of short pitching in the same synchronous generator?

In the design of a synchronous generator one can chose to eliminate or reduce harmonics at the expense of emf. The pitch factor \$K_p = \cos(\alpha/2)\$, which is always less than or equal to 1, ...
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Using TEG to generate electricity for cooling car interior parked in sun

I am working on how can I cool down or normalise interior temperature of cars parked in sun for too long as they get real hot. So I thought if this could be done by thermoelectric generators. I don't ...
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Effects of low frequency in a genset

I am working in a oversized genset that has 150 kW - 180 kVA capacity but it just has a demand of 20 kW, for this reason the control system try to maintain engine velocity but as the load is so low it ...
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101 views

Disadvantage of low load on a electric generator

I have a generator set that is oversized, it is capable of produce 180 kVA but I just demand 35 kW, it works with propane gas as fuel for primary engine. My question is, which are the disadvantages of ...
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58 views

Total power output a generator is able to produce [closed]

I have an oversized generator, it has 150 kVA and I am only using 25 kW. If the power factor is determined by the load, how can I determine the total surplus of energy that I could generate if I would ...
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98 views

Electric generator fuel consumption while load is increased

I am working on a gas plant that produces its own energy with an electogren group that operates with LPG as fuel. I noticed that this plant is oversized. It has a capacity of 150 kVA but the plant ...
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55 views

Coil generator in practice

I am trying to create something like gyroball. Which features LED lights, so the faster the spinning, the more light LEDs emit. This seems like a simple scenario of a coil generator. As an experiment, ...
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How/where does a generator + motor dissipate heat?

I've got a mystery that I can't wrap my head around. A generator is generating 1 kW of electric power. The current goes through copper cables to a motor, which is consuming say 950 W of electric power....
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DC motor coupled to a DC generator

Consider a separately excited DC motor which is coupled to a shunt dc generator (under no load condition) and acts as a prime mover. If we set the speed of the DC motor to some certain value (for ...
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149 views

How to limit current of a generator?

I have a diesel generator that I’m feeding as backup power to a smart Growatt solar off-grid inverter. The solar inverter accepts up to 100A input AC on 220V but the generator starts failing if it ...
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39 views

Synchronous generator governor

The way I understand the governor of a synchronous generator is as follows: As loads change on the system, the frequency will change. The governor's purpose is to maintain an approximately constant ...
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How power system handle unbalanced load?

how a delta connected primary winding of three phase distribution transformer tackle unbalanced load of three phase 4 wire unbalanced load(unbalanced load is quite common due to supply of single ...
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LTspice: is there a simple way to make pulse voltage source resettable?

I have a circuit in which I have to have a retriggerable one-shot pulse generator. The trigger event is an edge from a comparator. After the edge, a single positive pulse should be generated, duration ...
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170 views

Designing an automotive alternator's voltage regulator - how to avoid magnetic saturation in the rotor?

NB: See final edit. The question is based on a false premise Friends are making a test-bench for automotive ("Lundell") type alternators. They were supplied with an example alternator plus a ...
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38 views

Waveform of induced EMF in a basic AC generator

Consider the following simple generator. A bar permanent magnet is rotating at a constant angular speed by some external means. Two coils of wire are placed in the same plane as the axis of the bar ...
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92 views

Can steel nails be substituted for the silicon steel laminate in a motor/generator/alternator?

This is as diagram of a generator/alternator in which steel nails are used in place of silicon steel laminates:
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FET protection when switching an inductive load with an inductive power supply

I am building a wind powered water heater. The system has a wind turbine that turns a brushless DC motor as a generator. The 3 phase output from the BLDC is rectified and passed to a heater load. A ...
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Generator internal voltage calculation

The question: The answer: However, I think the answer is wrong, it should be: Vi = Vt + IdXd = 1+ 0.971.1j = 1.46 pu So, the voltage is 1.46 * 250 kV = 365.6 kV Do you agree?
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Output phase voltage of wye-connected synchronous generator

The question: The answer: However, theta is the angle difference between the terminal phase voltage and the line current as shown in Figure 20 below So, I think the answer would be 512/12 - 47/-34....
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Does a windmill generator spin faster or slower if no power is being tapped from it? [closed]

Title says it all. I can imagine it spinning faster because the energy that would be driving the generator isn't being tapped. But I could also imagine a scenario where a safety mechanism might ...
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55 views

Conception details for an electric generator (wire diwm. length, magnets size/force)

I'm working my way around electric generator, with a LOT of videos on YouTube, but not very much data, detailed information, so I hoping you will guide me. I know what I need as output. (220v 9000w ...
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73 views

Dynamo connected to ceiling fan to charge a battery

Just a hypothetical scenario : I am thinking of connecting a dynamo to the ceiling fan to charge up a battery which might be later used to power some low power gadgets. Whether this would save my ...
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Simulation of DFIG input voltage to stator

I'm currently looking into the modelling of a DFIG in simulink (however I have seen models in other programs as well) and I'm slightly confused as to why there is a 3-phase voltage input to the stator ...
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107 views

Alternator without permanent magnets and without external power source

From the answers to the following question (1), I gather that it is theoretically possible to operate an alternator / dynamo / generator: Without permanent magnets. With an external energy source ...
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How bad of an idea is it In an emergency to use my PV solar and propane generator together?

Set the stage: Say there is a massive grid disruption like what happened to Puerto Rico after Hurricane Maria. I live somewhere were air conditioning may be needed for some groups to remain healthy. I ...
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Generators with EV motors

I've read several questions/responses about AC generator(s) running EV motors, but they are all talking about gas or diesel-powered generators. My question is along similar lines. My idea is a PTO-...
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Under-excited synchronous generator with leading power factor

Can an under-excited synchronous generator have a leading power factor below is the phasor diagram to explain it The Synchronous generator equivalent circuit is
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41 views

300ns Pulse Generator to Drive LED

I wanted to use a 555 timer in astable mode to generate a 5V signal to flash an LED on and off. This works fine when the pulse length of the LED is in seconds or milliseconds. But this got me thinking ...
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Does this design induce a voltage in coil? Simple generator

Will this concept generate an electric current in coil circuit when wheel is rotating? If yes, how much is it effective if there will be many of these coil around wheel?
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119 views

How do I protect a contactor in arc weld circuit from wear?

I have a load banker (a toaster run by a 100 - 800 amp 10 - 40 V DC welder with non contact amp and volt sensors built in). I am trying to make an arc flash prevention unit for it. Relay control with ...
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3 phase generator coil winding testing [duplicate]

can some one help in testing methods of the stator and coil windings?
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Possible to induce AC power on a DC conductor using Magnetic Induction?

Ok, my science terminology is not good, so just bear with me. I'm not a scientist, or in school for this, I'm just trying to learn independently. I'm trying to make a certain kind of electrical ...
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Generator Power factor Calculation with varying Output Power

We are operating a generator (Stirling engine in particular) that outputs a certain active power in the range of 6.5-8.9 kW. The power output is adjusted with pressure variation. The electrical ...

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