Some generators are self excited; this means their terminal voltage is fed back to the excitation system to supply power to the rotor of the generator (which makes it into an electromagnet); the more power that is fed back, the stronger the electromagnet becomes, which makes it harder to turn the generator, which causes the generator to push out more power (simplified, really quick version).
If there is a fault electrically near the terminal of a self excited generator, the terminal voltage will sage to near zero; this means the voltage supplied to the excitation system will drop by the same percentage (say the terminal voltage is 30% of what it should be, then the maximum supplied voltage to the excitation system drops to 30% of what it normally is, since P = V*I). Since the input power is less, the output of the generator will decrease (current will decrease). The terminal voltage is determined by the impedance between the generator and the fault such that V = I*Z; As I decreases, V will also continue to fall, causing the terminal voltage to sag even more.
A non-self excited generator gets its' excitation power from the grid, specifically from a location that is electrically separated from its' terminal voltage. If the terminal voltage sagged to 30% (same fault location as above example), the excitation system voltage may be impacted slightly (say 2%) so the excitation system power is near maximum (98% for this example). Since the excitation system is much farther removed from the terminal voltage, it is not dependent upon it, thus the terminal voltage will not continue to sag as with a self excited system.
Terminal voltage is the voltage between the output terminals of a generator.
By Decreasing the excitation voltage the terminal voltage will decrease and similarly by increasing the excitation voltages the terminal voltage will also increases.
scope probes
The function of AVR is to automatically regulate the voltage of Generators. As the terminal voltage of a generators drops the AVR boosts the voltage.
A 400/230-V three-phase generator hase three line terminals, together with a neutral terminal. The line voltage (i.e. the voltage between any pair of line terminals) is 400 V, while the phase voltage (i.e. the voltage between any line terminal and the neutral terminal) is 230 V.
axon terminal
Terminal voltage is the voltage between the output terminals of a generator.
reactance,armature ohmic resistance(Ri) and armature reaction V=E-IaRa-Ia if Ia is small the voltage will be small too It=Ie-IL
only neutral point is gronded not a terminal ,
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flash the armature or "A" post of the generator to the positive terminal of the battery using a peice of wire.
A generator's terminal voltage can be raised by increasing the field current. This will result in an increased load on the generator, which will slow it down unless the governor kicks in to keep the generator at speed.
The generator terminal voltage will increase.
The speed and terminal voltage drastically reduces
A terminal potential difference is the potential difference appearing across the terminals of a voltage source, such as a battery or a generator, which varies according to the load supplied.When the battery or generator is off load (i.e. no load is connected to it), the terminal potential difference is equal to the electromotive force of that battery or generator.The terminal potential difference tends to decrease as the load current increases, due to a corresponding increase in the internal voltage drop of the battery or generator.
By Decreasing the excitation voltage the terminal voltage will decrease and similarly by increasing the excitation voltages the terminal voltage will also increases.
Remove the accessory drive belt. Disconnect the negative battery cable. Disconnect the generator electrical connector. Remove the engine harness terminal from the generator: - Slide the boot back along the cable. - Remove the engine harness cable nut (3). - Remove the engine harness terminal from the stud. Remove the generator bolts and generator. Install the generator. Install the generator bolts. Tighten the generator bolts to 50 N