Is there a problem with the generator exceeding the rated power?

Rated power: 600kva 1=600kva*, if the rated power is exceeded, it will have an impact on the motor and the engine, the motor is easy to burn out the electronic components on the motor for a long time, and more seriously will cause the motor to burn out, the engine will be overloaded for a long time will cause black smoke from the exhaust pipe, the carbon deposition in the combustion chamber will increase, the grease nozzle is easy to block, and the increase in carbon deposition in the valve will cause the valve to leak, which will lead to a decrease in power, and will also cause the engine to overheat, thereby accelerating the wear and tear between the various parts of the engine, Generally, overloading within 1 minute will not have a big impact on the motor and engine.

For example, the capacity of the diesel generator is 600kva, kva is the apparent power, when the power factor is 1, it is 600kw, the capacity of the diesel generator refers to the power of 1 hour, not the power of 24 hours, the power of 12-24 hours can only use 80% of the rated power, too large diesel will affect mechanical fatigue, manifested in the cylinder, flying car, etc.; The generator will overheat and burn out when running at full load for a long time.

Generally, the rated power is marked on the generator. When the power factor is 1 and full load, the actual power is the rated power. There will be no problem with the generator exceeding the rated power for a short time, but the heat will increase and the temperature will be high. If it does not work for a long time, it may burn out due to overload.

Answer] When the power factor of :d is lower than the rated value, the active power of the generator will be reduced, that is, the PG will be reduced and the response will be small. Because the lower the power factor, the greater the reactive power distribution of the stator current, because the inductive reactive power plays a demagnetizing role, the greater the effect of weakening the main magnetic flux, in order to maintain the generator terminal voltage unchanged, the rotor current will exceed the rated value, the corresponding loss increases, and the efficiency of the generator decreases.

Therefore, when the generator is running lower than the rated value, the active power PG (force) decreases, the reactive power QG increases, but the total apparent power SN decreases.

The difference between generator rated capacity and rated power is that the rated capacity of a generator is greater than or equal to the rated power.

The rated capacity of the generator is equal to the rated power.

The maximum voltage of the generator shall not be greater than 110% of the rated value.

Generator voltage variation within 5% of the rated value is allowed. However, if the voltage of the generator is too high, it will have the following effects on the generator

1) The temperature of the rotor winding rises beyond the rated value.

2) Make the stator.

The temperature of the iron core increases.

3) The structural parts of the stator may have local high temperatures, which will destroy the insulation of the stator windings.

The output voltage of the generator is not said in this way, it is stipulated in the national standard.

Three-phase 380V generator, rated output line voltage 400V, phase voltage 400.

Why not 380V and 220V, because there is line loss from the power supply side to the load side.

This is how the power transformer outputs: 10kV is 10kV line voltage becomes 400V line voltage.

Line loss can be calculated using Ohm's law: u=

The voltage fluctuation of the generator should be controlled within 10% of the rated voltage.

The output power of the generator does not match the rated power, because the rated power is the maximum power consumed by the generator when it is working, and the output power = the total power consumed by the output power - the thermal power of the resistance, that is, a part of the thermal resistance will consume a part of the power.

Output power"Explanation in academic literature: For other electrical appliances, nominal power, also known as nominal output power, refers to the maximum value of output power that can work for a long time under the premise that the electrical appliance is not distorted, and the maximum power refers to the maximum value of instantaneous power without damaging the electrical appliance, that is, the maximum load capacity that the electrical appliance can bear. Output power = input power The power of useless work.

There is no effect on the generator, but the output reactive power is a little less, the excitation current of the generator is smaller, the noise immunity of the generator is a little lower, and the stability coefficient of the generator is reduced when the system fluctuates.

1. The power factor of the generator is ahead of the generator, and the generator runs in phase, and the generator emits active power to absorb the reactive power in the power grid to reduce the system voltage.

2. The power factor lag means that the generator runs late, and the generator emits active power and reactive power.

3. From the perspective of the generator, the power factor mainly determines whether the generator is running in the late phase or in the advanced phase, and the normal working state of the generator is the late phase (over-excited state, the power factor is positive), and the active and reactive power are emitted to the system.

4. If the excitation current of the generator is relatively small and turns to under-excitation, it becomes a phase-in operation (the power factor is negative), and absorbs reactive power from the system; Generally, when the system has no reactive power, the power plant will be required to enter the phase operation, but the phase operation will cause the end heating and static stability to decrease.

Increase the excitation current.

An inductive component can be added to reduce the power factor.

Is it a stand-alone generator or a grid-connected generator?

Agree with the ground floor. It's very detailed.

Just increase the excitation.