0
What else can I help you with?
What is the working principle of Doubly Fed Induction Generator?
The principle of the DFIG is that rotor windings are connected to the grid via slip rings and back-to-back voltage source converter that controls both the rotor and the grid currents. Thus rotor frequency can freely differ from the grid frequency (50 or 60 Hz). By using the converter to control the rotor currents, it is possible to adjust the active and reactive power fed to the grid from the stator independently of the generator's turning speed.
What are precautions to be taken at the time of back charging of generator transformer?
Nothing. If your system can run your house while the main breaker to the power grid is off, then back charging will occur as a byproduct while the main breaker to the power grid is on and you are using less power than you are generating. During times of a power outage, you'll want to cut the main breaker to the power grid, so that your system doesn't try to power the entire neighbor hood.
What is the difference between generator over excitation versus under excitation when attached to the grid?
Over Excitation is a condition when the Excitation System is providing too much field current and as a result, the rotor of the generator will over heat. The Excitation System is equipped with an Over Excitation Limiter. This limiter acts to reduce the Excitation Current if this condition exists Underexcitation is a condition when the generator is not getting enough Excitation Current. If the generator does not get enough Excitation Current, it can be un-synchronized with the grid. We call this slipping a pole. If this occurs, the generator can be severely damaged. Kelly Thompson Engineering Lead Siemens Energy Alpharetta GA
What is reverse power of generator?
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
How do you measure Phase difference?
The easiest way to measure phase difference is with an oscilloscope. Connect one channel to one signal, and connect the other channel to the other signal. Display both channels and trigger off of one. Measure the time difference - best accuracy is at the zero crossing point - and represent that as a percentage of the full period of one signal, normalized to 360 degrees. If you are building circuitry to do this, there are many options but, basically, you are just repeating in circuitry what you do with the oscilloscope. There are some tricks... Assuming you are building a manual synchronizer for a generator, you can place a light bulb between the two phases, grid and generator. The light bulb will be at full brilliancy when the phases are 180 degrees out, and it will be dark when the phases are in sync. Still assuming the synchronization problem, you can connect the two phases to a special meter with two windings - the meter turns 360 degrees - and indicates phase angle - usually 12:00 is in sync - and most generators are designed to take the load when the generator is slightly faster than the grid and it is in the hot zone for being considered in sync.
What is the best generator switch for a house?
The best generator switch for a house is a transfer switch. It safely and seamlessly switches power sources between the utility grid and a backup generator during power outages, ensuring a reliable and efficient power supply to your home.
How does a generator connect to a house to provide backup power during outages?
A generator connects to a house through a transfer switch, which allows it to safely provide backup power during outages. The transfer switch disconnects the house from the main power grid and connects it to the generator, ensuring a seamless transition of power supply.
What conditions must be done before a generator can be connected to a 3 phase system?
Assuming the generator is in good condition and designed to be connected to a power grid. A generator can be connected by ensuring the generator is at very nearly the same speed as the grid (typically very slightly faster) and is generating a similar voltage. When the phases of the generator and grid align, the circuit breakers can be closed and the generator will become locked to the grid. If the generator is connected to the grid without being in phase, the difference in phase will allow significant current to flow and in some situations can actually be worse than a direct short circuit. As a result of this power companies use sophisticated equipment to ensure that generators can be safely connected to the grid without damage. Household, camping and most industrial generators are not designed to be synchronised with the grid and should not be connected to a grid system.
What conditions must be done before a generator can be connected to a 3-phase system?
Assuming the generator is in good condition and designed to be connected to a power grid. A generator can be connected by ensuring the generator is at very nearly the same speed as the grid (typically very slightly faster) and is generating a similar voltage. When the phases of the generator and grid align, the circuit breakers can be closed and the generator will become locked to the grid. If the generator is connected to the grid without being in phase, the difference in phase will allow significant current to flow and in some situations can actually be worse than a direct short circuit. As a result of this power companies use sophisticated equipment to ensure that generators can be safely connected to the grid without damage. Household, camping and most industrial generators are not designed to be synchronised with the grid and should not be connected to a grid system.
How does a generator breaker interlock work to ensure safe operation of a generator and prevent backfeeding into the utility grid?
A generator breaker interlock is a safety device that prevents a generator from backfeeding into the utility grid. It works by physically preventing the generator breaker and the main utility breaker from being turned on at the same time. This ensures that the generator is only supplying power to the home or building it is connected to, and not sending electricity back into the grid, which can be dangerous for utility workers.
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 can I backfeed a house with a generator safely and effectively?
To backfeed a house with a generator safely and effectively, you should use a transfer switch to connect the generator to your home's electrical system. This switch prevents power from flowing back into the grid, reducing the risk of electrical hazards. Make sure to follow all safety guidelines and consult a professional electrician if needed.
How can I back feed a house with a generator safely and effectively?
To safely and effectively back feed a house with a generator, you should use a transfer switch to connect the generator to your home's electrical system. This switch will prevent electricity from flowing back into the grid, which can be dangerous for utility workers. Make sure to follow all safety guidelines and consult a professional electrician if needed.
How can backfeeding a generator be safely prevented to avoid potential hazards and damage to the equipment?
To prevent backfeeding a generator and avoid hazards and equipment damage, install a transfer switch that disconnects the generator from the main power grid. This switch ensures that power flows only from the generator to the home, not back into the grid. This prevents potential dangers to utility workers and damage to the generator.
How does the process of back feeding electricity work in a power grid system?
Back feeding electricity in a power grid system occurs when excess electricity generated by a consumer's own power source, such as solar panels or a generator, is sent back into the grid. This process involves a bi-directional meter that measures the flow of electricity in both directions, allowing the consumer to receive credit for the excess electricity they contribute to the grid.
Would the electricity needed to heat a house come from a generator or a dry cell?
The electricity needed to heat a house typically comes from the grid or a local power plant, not from a generator or a dry cell. Generators are usually used as backup power sources for temporary or emergency situations, while dry cells, like batteries, are not designed to provide the continuous high power output required for heating a house.
Why would an electric meter on your house turn backwards?
Because the utility customer is providing energy to the grid. Usually because of net metering of renewable systems.
