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to start a self excited generator you must remove the load
the residual magnetism is the excitation
starting with a load demagnetizes the all the iron
dc generators are designed to have full field at operating voltage
so voltage is constant over a pretty wide range of speeds
ac can have permanent magnet embedded the shunt feild in the rotor keeps the voltage constant of course the frequency varies with rpm
What else can I help you with?
What is critical speed of dc generator?
the maximum permissible speed above which the generator is likely to damage or may cause circuit to fail.
What would happen if a shunt-excited DC generator was operated at too low a speed?
A shunt generator is a type of DC generator that does not use a permanent magnet. Reducing the speed of the generator will reduce the output, but not the load the generator requires because the currents in the parallel branches are independent.
What is the function of governor in a generator set?
The function of a governor in a generator set is to regulate the speed of the engine. It works by controlling the fuel flow to the engine, adjusting the throttle settings, and maintaining a constant speed regardless of the load demand. The governor ensures that the generator provides a consistent and stable output frequency and voltage.
What determinesthe amount of current produced in the armature of a generator?
The amount of current produced in the armature of a generator is primarily determined by the voltage induced in the armature winding, the resistance of the circuit, and the load connected to the generator. According to Ohm's Law, current (I) is equal to voltage (V) divided by resistance (R) (I = V/R). Additionally, factors such as the speed of rotation of the generator, the strength of the magnetic field, and the number of turns in the coil also influence the induced voltage and, consequently, the current generated.
How do you stabilize or regulate ac three phase voltage and frequency output from natural gas generator?
A natural gas generator connected to the grid has its voltage and speed (frequency) stabilised by being connected to the grid. All generators on a grid run synchronously, and it happens because if one generator has a tendency to lag behind it will produce less power and thereby maintain its speed.
What is Tacho generator?
Taco generator is the one which is attached to the shaft of big rotating machine to find out its speed. It converts the the rpm in to voltage i.e. the voltage generated in the small generator is directly proportional to the speed of the shaft to which it is attached meter attached to this generator is graduated in rpm instead of volts .
Does leg power affect speed of an athlete?
Leg power certainly affects the speed of an athlete. The strength generated by pushing against the ground usually increases speed.
What are the factors that determine the size and direction of the emf generated by the permanent magnet generator.?
number of conductors speed magnitude of the magnetic flux
How does the speed of turning affect the production of electricity in a wooden generator?
The speed of turning affects the production of electricity in a wooden generator by influencing the amount of mechanical energy being converted into electrical energy. Higher speeds generally lead to greater electricity production, but there is a limit to how fast the generator can be turned efficiently without causing damage or reduced performance. The design and efficiency of the generator will also play a role in how speed impacts electricity production.
What is the advantages of doubly fed induction generator?
1- can operate in generator/ motor mode for both sub/ super-synchronies speed mode with four possible operation conditions 2-A speed variation of ±30% around synchronous speed can be obtained by the use of power converter of 30% of nominal generated power 3-it has not necessarily to be magnetised from the power grid since it can be magnetised from the rotor circuit too 4- the size of the converter is not related to the total generator power but to the selected speed range and hence to the slip power
How you control the speed of self excited dc generator?
Easy. By controlling the speed of the motor or whatever is turning the generator's shaft.
Can a synchronous generator be driven on variable speed?
Synchronous generators are traditionally driven at a constant speed to maintain the fixed frequency of the generated electricity. However, with advancements in power electronics and control systems, it is possible to drive a synchronous generator at variable speeds by using technologies like electronic converters to adjust the frequency of the output power to match the grid.
What is the purpose for generator synchronising?
The purpose for generator synchronizing is to match the speed and frequency.
What is critical speed of dc generator?
the maximum permissible speed above which the generator is likely to damage or may cause circuit to fail.
What is relation between speed of generator and its voltage and torque on generator shaft and current produced by generator?
power = torque * rpm
What affects speed?
the brakes affect the speed
What is the effect of pressure and speed in sound waves?
Speed affects the frequency and pressure affects the wavelength.
