The most critical parameter of diesel generator is:

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Different models of diesel generator sets have different rated parameters.

1) Rated power (PE): refers to the maximum active power that can be output by the diesel generator set under rated operating conditions, in kilowatts (kW) or megawatts (MW).

2) Rated power factor (COS): refers to the power factor of the motor when it is rated to operate.

3) Rated voltage (UE): refers to the line voltage of the diesel generator set during normal operation, in volts (V) or kilovolts (kV).

4) Rated current (ie): refers to the line current of the diesel generator set when it is running in the rated state, and the unit is ampere (a) or kiloampere (ka).

5) Rated speed (NC): the speed required by the diesel generator set in order to maintain the frequency of alternating current at 50Hz, the unit is rpm (r min).

6) Rated efficiency (e): refers to the efficiency of the diesel generator set when it is running in the rated state. Generally between.

7) Rated frequency (FE): China stipulates that the rated frequency is 50Hz.

8) Rated temperature rise: the number of degrees allowed by the stator winding and rotor winding of the diesel generator set to increase compared with the ambient temperature during operation. In China, the ambient temperature is calculated at 40.

Analysis of noise sources of diesel generator sets.

Diesel engine block noise is a complex sound source composed of multiple sound sources. According to the noise radiation mode, it can be divided into aerodynamic noise, surface radiation noise and electromagnetic noise. According to the cause, the radiated noise on the surface of diesel engine can be divided into combustion noise and mechanical noise.

Among them, aerodynamic noise is the main noise source.

Diesel generator includes base, engine, generator, cooling water tank, the base is dominated by engine and generator, the main parameters of the engine are cylinders and displacement, the main parameters of the generator have the maximum current, for the diesel generator, its main identification parameter is power.

The generator parameters are very critical, mainly power and power factors, but if you have any special requirements, it will be different, such as the voltage of the outlet hz and so on, these must also be considered, otherwise it will not be too troublesome to use it in the place.

I feel that the generator parameters are very critical, mainly depending on what your needs are, the parameters are like a dissecting machine, giving you a clear view of each configuration of the machine, depending on your needs to buy generators with different configurations.

Diesel generator sets are divided into two parts: diesel engine, generator. The important parameters of the diesel engine are: main power, reserve power, speed. The important parameters of the generator are: frequency, voltage, current, power, and protection level.

Unit performance indicators include:

1. Voltage setting range.

It refers to the range of adjusting the voltage setting device to two limit positions, that is, the maximum value and the minimum value, when the generator set is no-load at the rated speed. The no-load voltage setting range is specified as 95% to 105% of the rated voltage.

2. Steady-state voltage regulation.

Refers to the rate of change of steady-state voltage under all loads from no-load to rated load, expressed by δu. It reflects the constant voltage accuracy of the generator. The steady-state voltage regulation of the alternator set should not exceed ;

3. Transient voltage regulation.

It refers to the instantaneous voltage change rate in the whole process of the generator set when the generator set is no-load, the speed and voltage are rated value, the specified load is suddenly added, and then the load is suddenly thrown off.

4. Voltage stabilization time.

Refers to the time it takes for the voltage to change from a sudden change in load to the range of 1 ± 3% of the voltage to a stable voltage.

5. Steady-state frequency regulation.

It refers to the ratio of the difference between the stable frequency of the generator set and the rated frequency before and after the load change, which is expressed as a percentage.

6. Transient frequency regulation.

Refers to the ratio of the difference between the instantaneous frequency and the frequency before the load change and the fixed frequency when the load of the generator set is abruptly changed, expressed as a percentage.

7. Voltage fluctuation.

Refers to the degree to which the voltage fluctuation of the generator set under constant load is expressed as a percentage.

8. Frequency volatility.

Refers to the degree to which the frequency of the generator set fluctuates when the load is constant, expressed as a percentage.

9. Sinusoidal distortion rate of line voltage waveform. Refers to the percentage of the root mean square value of the sum of the square of each harmonic voltage other than the fundamental voltage to the fundamental voltage ratio, expressed as ku. The voltage waveform distortion rate is small, which means that the output voltage is ***.

10. Temperature rise.

Refers to the temperature increase value of each winding when the generator runs to thermal stability under rated working conditions, which is expressed by . The temperature rise is too high. It means that the service life of the generator will be shortened.

11. Voltage deviation during three-phase asymmetric load. Refers to the percentage of the ratio of the difference between the maximum value (or minimum value) of the three-phase voltage and the average value of the three-phase voltage and the average value of the three-phase voltage when the difference between the two-phase current in the three-phase asymmetrical load borne by the generator set does not exceed 25% of the rated current, and the maximum one-phase current does not exceed the rated value. Denoted by af.

12. Voltage changes in hot and cold states.

Refers to the rate of voltage change of the generator set from cold to hot under rated working conditions. with δu; Denote. The small rate of change means good voltage stability from cold to hot.

13. Noise.

Refers to the sound pressure level measured at lm distance from the generator set. The noise of the generator set is assessed according to the sound power level of a count. High noise means that there is a lot of pollution to the environment.

14 vibrations. Refers to the vibration amplitude of the generator set, and the generator set is assessed according to the effective value of vibration speed. The vibration is large, the power generation unit can not operate normally, and the service life of the generator set is also shortened.

1. The rated power P(kW) or S (KVA) :p is the active power output of the generator (P= 3ivcos), and S is the apparent power of the generator (S= 3iv). (Yanan Yanan).

2. Rated voltage V: Generally marked with 400V 230V, that is, the three-phase rated voltage is 400V, and the single-phase rated voltage is 230V.

3. Rated frequency f: the national standard stipulates that the power frequency unit is 50Hz, and the intermediate frequency unit is 400Hz. (Yanan Yanan).

4. Rated current I: refers to the current that the stator winding of the generator is allowed to pass for a long time.

5. Rated power factor COS

hysteresis for three-phase generators), hysteresis for single-phase generators) and.

6. Rated speed n: corresponding to the speed of the generator rotor under the rated power. At present, the three-phase generator set is mostly used 1500r min, and the single-phase generator set is generally used 3000r min.

7. Rated excitation current IR: the DC current passing through the excitation winding when the alternator is under rated load conditions.

8. Rated excitation voltage vf: refers to the DC voltage added to the excitation winding when the rated excitation current is rated.

9. Excitation mode: the power supply that provides the excitation current, the one from the outside of the generator is called other excitation, and the one from the generator itself is called self-excitation. Other excitation and self-excitation are collectively referred to as excitation methods.

The other excitation mode is divided into two types: parallel excitation and compound excitation. The self-excitation method is divided into various types, such as salient pole reverse sequence magnetic field excitation, AC exciter excitation, reactance phase-shifting phase compound excitation, resonant phase complex excitation, third harmonic excitation, and thyristor excitation.

Diesel engine model, motor model, control module model. These are the three main blocks.

Basic parameters of diesel generator set: main power, standby power, unit capacity, rated speed, rated voltage, rated current, rated frequency, rated power factor, number of phases, unit reference weight, unit reference size, etc.

On the general controller, there are voltage, current, water temperature, oil pressure, battery voltage, speed, frequency 、......

The problem ratio is more ambiguous. Preliminary talk: different projects, different capacities, must choose different power generators.

The purpose of your generator is to carry the load, first of all, according to the load size to determine, and secondly, if the load is mostly a motor, the starting current should be considered, and the hard starting current is several times the side power to be multiplied by the corresponding multiple. In addition, if the load is mostly non-linear load, the usual way is to choose a permanent magnet exciter (PMG) generator set. Example load for 50kw motor generator selection:

Generally, the one-time loading capacity of the generator set is not convenient to exceed 60%. Excessive sudden load can cause excessive torque shocks on the generator and engine, as well as excessive voltage fluctuations on the electric ball.

When the motor starts directly, the current is about 7 times, and the generator set must first meet the power of 7 * motor.

It is best to choose a generator set of about 350kw.

The calculation method for other startup methods is the same as above (only the startup multiple can be changed).

The automatic switching cabinet is also called the double power supply cabinet, which plays a bridge role between the diesel generator set power, the mains power and the load. The automatic switching cabinet can ensure that when the mains power supply fails, the generator set will complete the power supply conversion within the set time (3s 10s) after automatic start, so as to realize the power supply to the load, and automatically switch to the mains power supply when the mains power is restored.

The technical performance index of diesel generator is the main basis for measuring the power supply quality and economic indicators of the unit. Its main technical performance usually refers to the performance that should be achieved when the power factor of the unit gradually changes or abruptly changes from the three symmetrical loads in the range of 0 100% or 100% 0 ratings.

1. Stable voltage regulation δu

where u1 is the maximum (or minimum) value of the temperature power supply after the load change; u - no-load setting voltage value.

The δu of the class unit is (1 3)%; The δu of the class unit does not exceed 5%.

2. Steady-state frequency regulation δf

where f1 is the maximum (or minimum) value of the steady-state frequency after the load gradient;

f2 - frequency at rated load;

f – Rated frequency.

The δf of the class unit is; The δF of the class unit does not exceed 5%.

3. Voltage stabilization time.

When a load changes abruptly, the time it takes for the voltage to begin to stabilize is calculated and is usually measured with an oscilloscope.

The voltage stability time of the class unit is; The voltage stability time of the class unit is 3s.

Fourth, the frequency stability time.

The time required from the time of sudden change in load to the time when the frequency begins to stabilize is usually measured with an oscilloscope.

The frequency stability time of class units is 2 5s; The frequency stability time of the class unit is 7s.

5. No-load voltage setting range.

The setting voltage of the unit should be able to adjust and work stably within the range of 95% to 105% of the rated value. For example, the no-load voltage of a unit with a rated voltage of 400V can be adjusted between 380 and 420V.

6. The stability of the operating voltage under the three-phase asymmetric load.

When the power supply of the unit is running under the three-phase asymmetric load, if the current of each phase does not exceed the rated value, and the difference of the current of each phase does not exceed 25% of the rated value, the difference between the voltage of each line and the average value of the three-phase voltage shall not exceed 5% of the average value of the three-phase line voltage.

7. Parallel performance of the unit.

Two three-camera units with the same specifications and models should be able to operate stably in parallel within the range of 20% to 100% of the rated power under the rated power factor. In order to improve the active power and reactive power, reasonable distribution accuracy and operation stability, the diesel engine governor in the unit is required to have a device that adjusts within the range of 2% and 5% of the steady-state regulation rate. The voltage regulating device in the control box (screen) can adjust the steady-state voltage regulation within the range of 5%.