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When a shunt generator fails to build up the voltage then how to rectify the fault?
Wiki User
∙ 12y ago
It fails to build up because self excited DC motor's armature have only one direction of rotation. So that if the poles of the armature are reversed, then this causes the reduction in the residual magnetism and eventually, it will stop.
Wiki User
∙ 12y ago
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What affect does a leading power factor have on alternator generator excitation currents?
When a leading power factor load is applied, the voltage of the genset or genset bus rises, and the voltage regulation system reduces exciter power, reducing the strength of the magnetic field. If the field fails, the generator set may slip a pole, which results in potentially catastrophic alternator damage. pawan
How do you troubleshoot generator that fails to supply ac voltage?
You first use the schematic diagram in the equipment service manual to understand the flow of the power and signals in the generator. The first thing to check is all of the power supply voltages. If one is missing, the generator can fail in such a way as to produce no output. Then you can use an oscilloscope to trace the problem backwards, from the output connector of the generator to to the source of the signal generation.
What do ground do in a circuit?
Circuits are on the ground for a few reasons one is to prevent contact with dangerous voltage if the electrical insulation fails. Also been on the ground limits the build- up of electricity static.
What is a generator transfer switch used for?
A generator transfer switch is used to switch an electrical load between different sources such as grid power and a standby generator or between multiple generators to allow for maintenance of a generator in a set. These switches can be automatic, switching between sources when a source fails or moves out of specification or they can be manual, requiring operator intervention.
How does AMF panel for generator work?
AMF stand for Auto Mains Failure. Generally a generator/alternator power and normal commercial line switching over is done through it. A normal changeover, if mains fails you have switch the load circuit to generator, and when mains restors, generator supply will be cut off and fed to mains. in AMF this done by contactors and control circuits. if you want to know more......
What is critical resistance of the field circuit of a DC generator?
The value of resistance of shunt field winding beyond which the shunt generator fails to build up its voltage is known as " critical resistance at a given speed it is the maximum field resistance with which the shunt generator excite.
Why a dc shunt generator may fail to self excite?
If there is no residual magnetism in the field poles then there would be no flux too induce the initial voltage for self exitation
What affect does a leading power factor have on alternator generator excitation currents?
When a leading power factor load is applied, the voltage of the genset or genset bus rises, and the voltage regulation system reduces exciter power, reducing the strength of the magnetic field. If the field fails, the generator set may slip a pole, which results in potentially catastrophic alternator damage. pawan
What happens if excitation fails in parallel oprating generator?
when excitation fails,Reactive power will be supplied by the system to which the generator is connected and generator will work as induction generator and its speed will rise a little. generator which was in over excitation mode will work in underexcitation.but there is under excitation limit which should not be reached so we should detect loss of excitation and trip generator
How do you troubleshoot generator that fails to supply ac voltage?
You first use the schematic diagram in the equipment service manual to understand the flow of the power and signals in the generator. The first thing to check is all of the power supply voltages. If one is missing, the generator can fail in such a way as to produce no output. Then you can use an oscilloscope to trace the problem backwards, from the output connector of the generator to to the source of the signal generation.
What do ground do in a circuit?
Circuits are on the ground for a few reasons one is to prevent contact with dangerous voltage if the electrical insulation fails. Also been on the ground limits the build- up of electricity static.
What are the negatives about series circuits?
1) If any component fails, then the whole circuit fails. 2) Voltage across any component may be hard to control.
What happen if a prime mover fails when two generators are in parallel?
It acts as synchronous motor by consuming power from the other generator....
Will a voltage regulator kill a battery?
Two things can happen. 1. the voltage regulator fails so that the alternator doesn't know the battery charge is dropping therefore the battery doesn't get charged. 2. The voltage regulator fails in such a way as to allow the alternator to overcharge the battery which causes the battery to overheat and fail, Sometimes an overcharged battery can explode.
What is a generator transfer switch used for?
A generator transfer switch is used to switch an electrical load between different sources such as grid power and a standby generator or between multiple generators to allow for maintenance of a generator in a set. These switches can be automatic, switching between sources when a source fails or moves out of specification or they can be manual, requiring operator intervention.
How to calculate short circuit protection for transformer?
don't overload it, have a look on the transformer their should be an input voltage and an output voltage if take fails just try and see if u can overload it when you do try and figure out the voltage and get a new transformer;)!!!!!
How do you test both water pumps on a 1949 ford 239 ci and test generator?
Wow! A flathead Ford V8. If you can drive the car, call around to your local parts stores and see if they can check a 6 volts generator. Here are some things to do if no one can test it for you. If you have a voltmeter, here are some easy tests to make: Measure the voltage across the battery. Should be about 6.3 volts with the engine off. As the engine speeds up, the voltage should increase to somewhere around 7 volts. If it does, the generator is working and charging the battery. If the voltmeter does not go up with the engine running, first check to see that the generator brushes are not worn excessively. If you can, apply a little pressure to the brushes while the engine is running and see if the gen light goes out or the voltmeter reading increases. If it does, the brushes may be worn to the point that they don't exert enough pressure on the commutator. If the brushes check OK, do this test: Disconnect the generator from the regulator (probably easiest to simply take the wires off the generator). Connect a jumper from DF on the generator to the generator frame. Now run the engine and measure the voltage from ground to D+ on the generator. NOTE: Some generators have different types of terminals; verify which is DF and which is D+. As you increase the engine speed, the voltage should jump up to +17 volts or so (@3000 RPM). If it passes this test, the generator is good. (Don't run this test longer than necessary as it will overheat the generator.) If it fails that test, the generator may need to be polarized. Leave the jumper wire connected from DF to ground. Remove the fan belt. Connect a wire from the battery + terminal to D+ on the generator. The generator shaft should start to spin. Don't run this way for more than a few seconds to avoid overheating. The generator will now be properly polarized. If the generator did not spin during this motoring test, the generator is likely defective. Put the belt back on and re-test for generator voltage with DF grounded. If the output voltage is still low, the generator is defective. About polarizing Generators, unlike alternators need to be "polarized". Auto generators need some magnetism to get started. This "residual" magnetism remains in the Field pole pieces even after the engine has stopped. The next time the generator starts up, the residual magnetism creates a small voltage in the Armature windings. Not enough to charge the battery, but enough to allow the Field windings to draw current. As the Field current increases, the pole pieces create even more magnetism. That makes even more voltage in the Armature, and the cycle continues until the generator is capable of producing maximum output. A generator which has been stored a long time or is freshly built may have lost the residual magnetism to the point where it can no longer get the generator started producing voltage. In the case of a new generator or one which has been mis-treated, the residual may even be of the wrong direction (North and South poles reversed). Polarization is a simple process used to restore the Field pole residual magnetism and ensure the magnetic direction is correct. As to you water pumps, remove the radiator cap and start the engine. Look for flow. No flow then both pumps are bad. If a pump is leaking at the shaft or through the weep hole, it needs rebuilding or replacement. The only sure fire way to know if the pump is good is to remove it and take a look inside. If the impeller is not broken, it should pump. Good luck, you have a classic.
