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What are the major causes of loss of excitation on generators?
Makauremarshall
The major causes of loss of excitation on generators are due to an open circuit or a short circuit in the field winding. This may also be caused by a breakdown of the insulation system.
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∙ 10y ago
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Which relay is used to detect the loss of excitation in generator?
A loss of field relay.
What is loss of excitation in generators?
A loss of excitation will cause the generator to start drawing more and more reactive power over time. Over the first few seconds, and until about thirty seconds after the LOE (depending on the load on the generator before the loss of excitation occurred), active power will stay relatively constant, but reactive power will continue to be absorbed from the rest of the system, and voltage levels will drop. Eventually, the magnetic field between the stator and rotor degrades too much, pole slipping and loss of synchronism will occur. At this point, catastrophic damage will likely have been done to the generator.
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
Why loss of field-protection is important?
loss of field protection is important because when a synchronous generator looses field excitation its acts as an induction generator and draws reactive power from the system which heats and damages rotor so as soon as the loss of field excitation is sensed the generator breaker should be opened as the rotor and the stator would both heat up and could damage. Best Regards, Ayaz Ahmed
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A transformer's excitation current can be resolved into two components. The first is in phase with the primary voltage, and is responsible for the losses. The second lags the supply voltage by 90 degrees, and is responsible for magnetising the core.
Which relay is used to detect the loss of excitation in generator?
A loss of field relay.
What is loss of excitation in generators?
A loss of excitation will cause the generator to start drawing more and more reactive power over time. Over the first few seconds, and until about thirty seconds after the LOE (depending on the load on the generator before the loss of excitation occurred), active power will stay relatively constant, but reactive power will continue to be absorbed from the rest of the system, and voltage levels will drop. Eventually, the magnetic field between the stator and rotor degrades too much, pole slipping and loss of synchronism will occur. At this point, catastrophic damage will likely have been done to the generator.
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
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Reactance certainly causes loss in a transmission system, but I^2R or resistance losses are greater.
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There are a lot of benefits that can come with electric generators. Many people may have a hard time seeing the benefits of buying electric generators, but these people are usually the ones wishing they had one when the need arises. The truth is that electric generators are really something that you have on hand to protect yourself from loss associated with an unforeseeable power outage. In a business environment, these outages can result in a big loss in productivity. However, in the home environment, these outages can result in the loss of hundreds of dollars when your refrigerator and freezer don't have power.
Why loss of field-protection is important?
loss of field protection is important because when a synchronous generator looses field excitation its acts as an induction generator and draws reactive power from the system which heats and damages rotor so as soon as the loss of field excitation is sensed the generator breaker should be opened as the rotor and the stator would both heat up and could damage. Best Regards, Ayaz Ahmed
