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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23 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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2answers
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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2answers
148 views

Power system - Economic dispatch

Quick concept related question, I have a system with 5 generation units and I have to find the maximum demand that the system can support and still be N-1 secure. their max outputs are: Unit A= 155, ...
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13k views

Diesel generator consumption formula

I am working on a project to monitor a power meter parameters like voltage, frequency, current and so on and this monitoring for both AC and DC. For DC we are using Cummins diesel generator, now I ...
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21 views

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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3answers
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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3answers
2k views

Using Electric Motor/Generator Instead of Inverter to Deliver AC Mains from Batteries / Solar

I am exploring/researching Solar PV systems and the possibility of setting up a solar installation company. DC/AC inverters are very expensive and I am trying to find a cheaper solution. Question: ...
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171 views

Connecting a medium sized 1 kVA Inverter with a 2 kVA Generator

I have a 1 kVA inverter which is using a 12 V battery to generate 220 V AC (battery is connected to a charge controller and is being charged by a PV). In addition I've got a 2 kVA generator. ...
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167 views

Induced EMF in electrical machines

I am currently working with machines and when I try to understand their principles in-depth, specifically in machines, I got to know that EMF is induced because of any of the two reasons: 1) Time-...
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51 views

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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61 views

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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4answers
575 views

Generating electricity: Does wire thickness for magnetic induction matter?

I know that the strength of the magnetic field and the speed by which the conductor passes the magnetic field have an effect on magnetic induction for the voltage output on a generator. I also know ...
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40 views

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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1answer
188 views

Generated current in a \$3\times450\$ VAC \$60\$ Hz \$1150\$ kVA generator

Let's say I've a \$3\times450\$ VAC \$60\$ Hz \$1150\$ kVA generator. How much current will there be generated when it runs at maximum capacity? MY WORK: The total Active power over a three-fase ...
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1answer
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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27 views

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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188 views

nanosecond electronic pulser circuit - up to 100MHz

I would like to create a circuit which creates nanosecond pulses for a trigger signal with a frequency from 20 to 80 MHz, at 3.3V. I have created the following cricuit as can be seen in the attatched ...
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4answers
283 views

What happens to the generator if we don't consume the generated electricity from generator? Only theoretical explanations, please

As all we know, there are different ways of generating electricity such as solar cells, wind turbines, dams, etc... I'm gonna pick wind turbines as a metaphor to tell what is on my mind. Let the wind ...
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6answers
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Square wave generator

Can you explain what for is resistance R101 on next schematic: I understand why we need R105 (open collector) and R102 (positive feedback). But R101? and C11? Thank you.
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1answer
90 views

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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42 views

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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5k views

How to control the output voltage for the different types of the DC generator?

Generally DC generators are classified according to the ways of excitation of their fields. There are three methods of excitation. Field coils excited by permanent magnets – Permanent magnet DC ...
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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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1answer
30 views

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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6answers
122 views

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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2answers
89 views

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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41 views

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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48 views

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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64 views

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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2answers
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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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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1answer
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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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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1answer
85 views

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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1answer
192 views

I found a motor/generator thing at my school's storage. I was wondering if anyone could identify it

Im not sure what this is because it has both a commutator and a stator. It didnt have anything else with it. Im guessing it has something to do with ac generation.
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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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85 views

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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3answers
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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1answer
42 views

Generator data for synchronizing

I have two DG sets which are to be synchronized on to the same AC bus and needless to say, they must share load. I have gathered some parametric data which I felt would decide how well these can work ...
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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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37 views

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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67 views

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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1answer
873 views

How to Find Angle of Armature Current

Two identical three-phase, Y-connected, synchronous generators are connected in parallel to equally share a load of 900 kW at 11 kV and 0.8 pf lagging. The synchronous impedance of each generator is 0....
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245 views

Why does rotor of synchoronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during fault in lines that ...
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224 views

How can a DFIG have total control of reactive and active power?

I'm confused with the power flow of the rotor to the grid, specifically the both-way direction
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301 views

What makes the generator practical?

"A student tried to make an AC generator consists of a coil of one turn, and cross sectional area of (\$7.54 × 10^{-3} m²\$), and rotates in magnetic flux density (\$2.5 × 10^{-2} T\$), and when ...
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Calculating for Load Resistance given a T network in between the source and the load

Problem: Calculate the value of load resistance (Rl) for which maximum transfer occurs. Attempt: What I know is that for the maximum transfer to occur, the load resistance must be equal to the source ...
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101 views

Wind Turbine - Current vs Power trend

I'm looking at wind turbine current - power trends, and there is a phenomenon I need help to explain! The data I'm analysing is from a 3-phase generator. Below is a scatter plot of current (x axis) ...
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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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