What principles need to be followed in the selection of diesel generators

How to choose a diesel generator set manufacturer.

Diesel generator brands include: Cummins generator set, Fujian Yanan generator set, Yuchai generator set, Weichai generator set, etc.

Many people have no understanding of diesel generator sets before buying diesel generator sets, and only know that they can replace mains. I don't know anything about its production process and various configurations. At this time, the most important point is to choose the right manufacturer, because, because the generator set is a high-tech process product of modern industry, the choice of the manufacturer is quite important.

There are several main considerations for choosing a manufacturer:

First, whether it is at the average level of the same industry, you can shop around; If it's too high, it's not good, and if it's too low, it's definitely not okay. The current ** is quite transparent, if the ** is too low, there must be a problem;

The second is the scale of the company, there is a certain scale of the factory, which is relatively reliable in terms of quality, and at the same time can understand the past sales status of the factory, and if necessary, you can ask for some typical customers, and go to the enterprises that have used the company's products to understand the operation of the unit;

The third is after-sales service, the working conditions of the generator set are very harsh, and machine failures are inevitable, therefore, it is very important to understand the after-sales service capabilities of the manufacturer, such as technical equipment, the number of after-sales personnel, after-sales service vehicles, and the service attitude of technical personnel;

Fourth, accessories and consumables, if it is an imported unit, see whether the manufacturer has enough imported accessories and consumables, because some small factories are in the same industry to transfer goods, accessories and consumables are difficult to guarantee; Buyers can choose the right supplier according to these conditions.

There are many matters that need to be paid attention to in the selection of diesel generators, and the following is summarized, hoping to bring reference to users.

First, first of all, we should pay attention to the selection of diesel generator set manufacturers, and pay attention to the first is the first of the manufacturers' units, whether they are at the average level of the same industry, and you can shop around. The second is the scale of the company, which has a certain scale of factories and is relatively reliable in terms of quality. The third is after-sales service.

Fourth, accessories and consumables, if it is an imported unit, see whether the manufacturer has enough imported accessories and consumables.

Second, the selection of diesel generator sets should pay attention to:

1. The purpose of the unit. Because the diesel generator set can be used in 3 situations, such as common, standby and emergency. Therefore, the requirements for diesel generator sets for different purposes are different.

2. The selection of unit power must be based on the specific working situation to choose the appropriate power unit.

3. Select the appropriate unit configuration for the unit according to the use requirements and working environment of the unit.

How to quickly choose the right diesel generator set.

Diesel generator set is a kind of AC power supply equipment of self-provided power station, which is a kind of small and medium-sized independent power generation equipment. Because of its flexibility, low investment, and ready-to-use characteristics, it is widely used in various departments such as communications, mining, road construction, forest areas, farmland drainage and irrigation, field construction, and national defense projects. Since its invention, diesel generators have fully demonstrated their practicality and good adaptability.

However, in the face of more and more choices, how do we choose?

1. Determine the type of use and environment.

When choosing a diesel generator set, the first thing to consider is the operating environment. Whether used as a standby power source or as a mains power supply. Depending on the use, the environment and frequency of use will be different.

As an active power source, diesel generator sets are not only used more frequently, but also maintained more frequently. Standby diesel generator sets are usually only started in the event of a power outage or outage on the main grid. Standby diesel generators require longer time intervals to be used compared to mains power.

To choose a high-quality diesel engine, users also need to consider the use environment. Whether it has the functions of cold resistance, high temperature resistance, moisture resistance, etc., and whether the surrounding environment has requirements for noise value. These conditions will affect the use of generator set equipment;

2.Determine the power.

The capacity of a diesel generator set is limited. When selecting a generator set, the user must consider the starting current of the electrical load. Due to the different starting methods of electrical appliances, the starting current will also be different.

Whether the appliance is loaded or not will directly affect the starting current. Therefore, it is important for the user to have a good understanding of the specific appliance in order to calculate the required diesel power generation more economically. This also avoids the phenomenon that you can't use it if you buy the wrong one.

3. Determine the appearance, size and discharge position of the unit.

Diesel generator sets come in different powers and sizes. In particular, different diesel generator sets have certain differences in appearance. Before buying a unit, you must confirm the size with the manufacturer, whether it can be placed in an ideal position, and make reasonable use of the existing space.

Is it convenient to exhaust air after diesel combustion. And attention needs to be paid to the use of regional emission standards.

4. After-sales maintenance.

When buying a diesel generator set, the last thing to consider is the after-sales and maintenance of the generator set. In fact, the quality of after-sales service is mostly related to the professionalism and degree of the manufacturer.

Diesel generators are divided into foreign brands and domestic brands. Foreign brands include Perkins generator sets, Cummins generator sets, etc.; Domestic brands include Yuchai generator set, Weichai generator set, etc.

For generator sets of the same power, foreign brand diesel generators are higher than domestic brands; The higher the power of the generator set of the same brand, the higher the diesel generator.

When the owner buys the generator set, it can be based on the amount and power of the electrical equipment, the use environment of the generator set, the budget, etc. as reference factors.

So which diesel generator brand is better?

Each brand of diesel generator has its characteristics, foreign brands, many people know, use rest assured; Domestic brand, most reasonable, stable quality. According to the actual needs, the purchase of the right generator set is a good generator set.

Diesel engines should be selected according to the speed, use area and season.

Generally, the diesel engine with a rated speed of more than 1000r min should use light diesel oil and No. 10 light diesel oil, which is suitable for high-speed diesel engines with preheating equipment;

No. 0 light diesel oil is suitable for use in areas with a minimum temperature of 4 or more;

No. 10 light diesel oil is suitable for use in areas with a minimum temperature above -5;

No. 20 light diesel oil is suitable for use in areas with a minimum temperature of -14 or above;

No. 35 light diesel oil is suitable for use in areas with a minimum temperature above -29;

No. 50 light diesel oil is suitable for use in areas with a minimum temperature above -44.

For heavy diesel oil, usually the diesel engine with a rated speed of 500 1000r min is selected as No. 10;

The rated speed is 300 700r min diesel generator selection 20;

No. 30 is selected for diesel engines with rated speed below 300r min.

There is a standard for this, GB252 defines ordinary diesel, and GB19147 defines automotive diesel.

Ordinary ones are mainly used for non-automotive or low-speed diesel engines; Look at the second criterion for car use.

Both define the technical requirements for diesel.

When we choose the generator set, we should not take into account the following factors. The most important thing is the capacity of the load and the mechanical performance, as well as the external conditions of the environment in the use of the unit, such as the climate, temperature, altitude and noise intensity. Generally, generator sets can be divided into three types:

Common-use, standby, and emergency. It can be seen that different generator sets have different requirements and uses. It is a good choice for the use of common generators with long working durations and large loads.

The capacity, quantity and type it involves are very different from those of emergency units. First of all, we need to understand the determination of capacity.

1. Determination of capacity: It is judged according to the power output of the generator team leader after the operation time, so as to meet the maximum load of the project.

2. Determination of the number of generator sets: the general setting is 2 or more units, in order to ensure the continuity of power supply, only when the number of units increases and becomes more, can the circle be determined according to the change of charge to determine how many generator sets should be put in.

3. About the speed: ordinary civilian people can choose a unit with a speed of 1000-1500 rpm, and only a speed of 300-350 rpm is needed for marine use.

4. Need to determine the voltage: the output voltage of the generator should be the same as the voltage of the emergency generator, of course, it is not excluded that individual power consumption is large, and the high-voltage generator set should be selected in general.

1: The performance of automatic diesel generator set is as follows:

1) A single generator set is automated, which is used for emergency power supply. Voltage and frequency are kept constant during operation.

2) The generator set should automatically maintain the emergency standby operation state (the battery is automatically charged; The gas cylinder is automatically inflated), and the diesel engine is automatically pre-lubricated before starting.

3) When the generator set needs to start, run or stop, it can automatically start, run or stop according to the automatic control instructions.

4) During the operation of the generator set, if there are abnormal conditions such as overload, short circuit, overspeed, overfrequency, high water temperature and low oil pressure during the operation of the generator set, it can be automatically protected.

5) The generator set should be equipped with a sound and light signal system that indicates normal operation, and through these indication signals and alarm signals, the operation of the unit is indicated.

6) The generator set should be able to run continuously for 4 hours in the case of unattended

2: In addition to meeting the requirements of a first-class automation unit, the automatic diesel generator set should also have the following functions:

1) The generator set should have the function of automatic replenishment of fuel, oil and cooling water.

2) The generator set can run continuously for 240h in the case of unattended

3: Automatic diesel generator set in addition to satisfying.

In addition to the requirements of the first and second level automation units, they must also have the following functions:

1) When the generator set fails to start automatically, the self-start control program system should be able to automatically transfer the start command to another standby unit.

2) The generator set should be able to complete the automatic parallel and unloading of two generator sets of the same model and specification according to the automatic control command or remote control command.

3) When the generator sets are running in parallel, the output active power and reactive power should be automatically distributed.

4) The generator set has in addition to:

In addition to the protection of the first and second level automatic units, they should also have functions such as reverse power protection.

Diesel engines should be selected according to the speed, use area and season.

Generally, the diesel engine with a rated speed of more than 1000r min should use light diesel oil and No. 10 light diesel oil, which is suitable for high-speed diesel engines with preheating equipment;

No. 0 light diesel oil is suitable for use in areas with a minimum temperature of 4 or more;

No. 10 light diesel oil is suitable for use in areas with a minimum temperature above -5;

No. 20 light diesel oil is suitable for use in areas with a minimum temperature of -14 or above;

No. 35 light diesel oil is suitable for use in areas with a minimum temperature above -29;

No. 50 light diesel oil is suitable for use in areas with a minimum temperature above -44.

For heavy diesel oil, usually the diesel engine with a rated speed of 500 1000r min is selected as No. 10;

The rated speed is 300 700r min diesel generator selection 20;

No. 30 is selected for diesel engines with rated speed below 300r min.