0
It is wise to start thinking of power in DC circuit. If a load is connected to a power source in a DC circuit, the corresponding VOLT CURRENT plot both will be in the positive quadrant. Of course, polarity must be correct. Now if the CURRENT (in the same polarity arrangement) happens to be in the negative quadrant, the power is said to be reversed.
The same can be thought in an AC circuit. Taking a half wave cycle of both VOLT and CURRENT, one can apply the same understanding as in the DC circuit.
If the AC circuit is capacitive or inductive, VOLT and CURRENT waves will be shifted according to the value of the capacitive or inductive load, and here one has to be aware.
Adel Aljassar
adel@al-jassar.net
Wiki User
∙ 14y ago
Wiki User
∙ 10y agoReverse power generally describes a condition where the prime mover of a generator is not supplying sufficient torque to keep the generator rotor spinning at the same frequency as the grid to which the generator is connected. In other words, the generator has actually become a motor and is drawing current from the grid to which is connected and is supplying torque to the prime mover which is supposed to be supplying torque to the generator. I found this answer in another post and is the best and easiest to understand
Wiki User
∙ 12y agoA generator can enter a state called "motoring", where the prime mover is no longer providing the power for the generator, the electric grid is. Under this condition the generator is using power instead of providing power. Reverse power relays are used on generators to trip them if this condition occurs.
Add your answer:
Earn +20 pts
How many times per second does the alternating current generated at large power generator reverse directions?
120
How do you test generator reverse power?
To test the generators reverse power relay to make sure the generator is spinning at the right speed and a fuel issue is not involved. If it is not a fuel issue you need to check the frequency of the electronic load and frequency. If both of these issues are okay check the diesel electronic control unit for dirt and dust. This unit needs to be clean.
Why is it said that generator is a motor working in reverse?
because working principle of both the things are same.The motor converts electrical energy in to mechanical via magnetic induction and generator do the exact opposite of this.And yes,you should use 'electricity generator' not only 'generator'.
What happen when you reverse the direction of rotation in a separately excited dc generator?
When reverse the direction of a seperately excited DC generator,only polarities has been reversed,i.e., (+) becomes (-) and (-) become (+).
How do you calculate power use for a home power generator?
Click the link. There you can figure the size generator you need.
What is reverse power in generator and what happens in couse of reverse power?
Not necessarily. Reverse power simply means that the load is providing power to the generator, instead of the reverse. Its not a good place to be, because you waste the power needed to turn the generator, and you could damage it as well.
How reverse power will occur during synchronizing?
Reverse power flow into a generator can occur during synchronization if the generator is spinning too slowly, or the voltage phase angle is lagging relative to the power system. If the generator is spinning too slowly, power from the system is used by the generator to increase its' speed. If the phase angle is lagging, an initial spike of power will flow into the generator to force it into sync with the system. Typically generator's will match system frequency very closesly, and force the phase angle to leading slightly between the generator and the system. When synchronized, an extra bump of power will flow out while the generator is torqued into phase with the system. This will avoid tripping any reverse power devices.
What is the Operation of reverse power relay in a substation?
Reverse power relays are often used in generator protection to trip breakers if generators are "sucking in" power (since this shouldn't occur, it is a BAD thing when it does). I'm not sure there is a use for reverse power relays beyond this; directional relays looking in a reverse direction are often used in pilotting schemes, though (not "reverse power").
How many times per second does the alternating current generated at large power generator reverse directions?
120
How control the reverspower for diesel generator?
I guess you're thinking that reverse power is a generation error, but it is a change in flow direction. When two generator are running in parallel nd of sudden a generator2 prime is dropped nd due to circuit breaker2 is still in on state Gen2 draws power from Gen1 and acts as a motor. this action will damage the prime mover(engine) nd AVR too. Of course upto 10 amp of reverse current is allowed into a generator as of considering as back emf (while running as generator). So in order to stop thing reverse power, a relay is used which senses the directional flow of power nd immediately turns off the circuit breaker of off prime mover unmatched droop also develops this reverse power flow because of change in voltage nd load sharing
What is a Reverse current relay?
A reverse current relay prevents a generator from discharging the battery when generator output is less than battery voltage. When generator output is greater than battery voltage, the reverse current relay closes and connects generator to electrical bus.
What is a reverse KVAR relay?
The reverse KVAR relay protects a generator from a loss of excitation. When the excitation system is lost, reactive power will flow from the system back into the generator. When this happens, induced currents at twice the system frequency will flow in the rotor windings and rotor structure.
Why does the synchroscope need to be rotating clockwise if it is turning slowly counterclockwise won't that work the same?
because the incoming generator has be connected as a source and not a load to the grid. if the frequency of the incoming generator is lower than the grid frequency then ... it will behave as a motor drawing power from the grid and generator will trip in reverse power protection.
How do you test generator reverse power?
To test the generators reverse power relay to make sure the generator is spinning at the right speed and a fuel issue is not involved. If it is not a fuel issue you need to check the frequency of the electronic load and frequency. If both of these issues are okay check the diesel electronic control unit for dirt and dust. This unit needs to be clean.
Buy a Power Generator?
form_title=Buy a Power Generator form_header=Have a source of power in case of emergency or power outage. What type of power generator do you need?=_ What do you want to keep powered?=_ What is your budget for this power generator?=_
An electric motor is a generator in reverse meaning that it can turn electricity into?
An electrical motor generator in reverse means that it can turn the electrical energy to mechanical and kinetic energy.
What is a reversing relay?
A reverse current relay prevents a generator from discharging the battery when generator output is less than battery voltage. When generator output is greater than battery voltage, the reverse current relay closes and connects generator to electrical bus.
