What are the power selection skills of diesel generator sets

1. The selection of the power of the diesel generator set must meet the working requirements of the unit, and the power of the generator set is not simply added to the power of all the electrical appliances, but also the starting mode of the electrical appliances. The general starting mode is divided into direct start and step-down start or frequency conversion start, the former starting current is about 6 times of the working current, and the instantaneous power will reach 6 times of the rated power; The starting current of the latter is about 3 times, and the instantaneous power is also 3 times the rated power.

2. Therefore, when selecting the power of the generator set, in addition to the sum of the power of all electrical appliances, it is also necessary to consider the starting power of each electrical appliance.

3. The power is also divided into long-line (rated) power and standby power, and the long-line power is the power that the generator can run continuously for 12 hours, and the standby power can only run for one hour in 12-hour continuous operation.

Precautions for the selection of the power of the diesel generator set:

1. The upper kva is the apparent power, kw is the effective power, and the relationship between them is ikva=. Imported units generally use KVA to represent the power unit, while domestic electrical equipment is generally expressed in KW, so KVA should be converted into KW by 20% when calculating power.

The general power of diesel generator sets is from 8 to 2000kw, and the brands of diesel generators include Cummins generators, Perkins generators, Volvo generators, Yanan generators, Yuchai generators, Weichai generators, Shangchai generators and other brands. Generally, diesel generators include stationary generators, mobile generators, silent generators, containerized generators and other styles.

When the owner chooses the generator set, the basis for reference is: the amount and power of the electrical equipment, the environmental requirements for the use of diesel generators, the requirements for the automation level of diesel generators, the owner's budget, etc. The generator set purchased according to the actual needs is the appropriate generator set.

With the development of industry, generator sets as emergency backup power supply has become indispensable, what need the owners to pay attention to when purchasing emergency generator sets?

1. The rated power of the generator set is kva and kw, but 1kw =, that is, the power of the 500kva genset is 400kw.

2, to refurbished machine or second-hand pretending to be a new machine, brand diesel engine has a unique serial number in the world, the owner bought the generator set, you can check these serial numbers on the Internet, refurbished machine or second-hand phone will definitely appear use information.

3. The generator set uses inferior or unqualified raw materials.

Diesel generator set in our country is the main power that is continuous power to nominatal, the maximum power that the generator set can be used continuously within 24 hours we call continuous power, and in a certain period of time, the standard is every 12 hours can be overloaded on the basis of continuous power 10, the unit power at this time is what we usually call the maximum power, that is, the standby power, that is, if you buy the main 400kw unit, If you buy a standby 400kw unit, if you don't overload the unit and usually open it at 400kw, in fact, the unit has been open in the overload state (because the actual rated power of the unit is only 360kw), which is very unfavorable to the unit, which will shorten the life of the unit and increase the failure rate. Therefore, the choice of diesel generator set power is to add 10% power reserve on the basis of the user's total load, which is both economical and practical.

In addition, consumers need to be reminded that most of the standby power is used in the world, which is different from the domestic one, so there are often irresponsible manufacturers in the market who will swap the power of the two to introduce and sell units, deceive consumers, and be cautious when buying diesel generator sets.

Diesel generator set is a non-continuous operation of power generation equipment, if continuous operation for more than 12 hours, its output power will be about 90% lower than the rated power. If the user needs to use it for a long time, it is necessary to configure a common generator set, that is, the generator set should take into account the power reduction of the unit for a long time.

First, to choose imported diesel generator set or domestic diesel generator set? Imported units generally use KVA to represent the power unit, while domestic electrical equipment is generally expressed in KW, so KVA should be converted into KW by 20% when calculating power.

2. Pay attention to whether the unit is used as a common power supply or a standby power supply.

3. To determine the power of the generator set, it is not a simple addition of the power of all electrical appliances, but also to consider the starting mode of electrical appliances. Generally, the starting method is divided into direct start and step-down start or frequency conversion start, the former starting current is about 6 times of the working current, and the instantaneous power will reach 6 times of the rated power; The latter starts to roll up the current is about 3 times, and the instantaneous power is also 3 times the rated power. Therefore, when selecting the power of the generator, in addition to the sum of the power of all electrical appliances, it is also necessary to consider the starting power of each electrical appliance.

The generator power is based on the power of the equipment in the home multiplied by 3 times the starting current, for example: the power of the rice cooker is 200w, the induction cooker is 1200w, and the sum is 1400w 1400 times 3 = equal to the power of the generator).

The selection of a generator should be considered from the following points:

Step 1: Determine the power of the electrical equipment, if the power of the electrical equipment is 300kw, then it is not possible to choose a 300kw generator, because a starting current should also be considered. When the electrical equipment is started, it is necessary to overcome the inertia to do work, and the starting current is generally 2-7 times of the actual current.

Step 2: Choose the diesel engine brand of the generator, know the starting current to determine how big the generator to use, and the performance indicators of the generator, the diesel engine accounts for a considerable proportion, because the power of the generator is the diesel engine, the diesel engine is full of power, easy to maintain, and the failure rate is low.

Step 3: The age of the generator, the age of the generator is clearly the cumulative running time, the generator is different from other machines, if it is used as a standby machine, it may not run for ten or eight years. If it is used as a long-lasting power supply, it is 24 hours of continuous operation.

The service life of the diesel engine is generally relatively long, and the machine that has been running continuously for 5 years is still no problem, but there is a big difference between a new machine and an old machine in terms of failure rate, fuel consumption, noise, exhaust emissions, etc., so try to choose a relatively new machine.

This depends on the needs of the family, if you have more electricity for household appliances, you must need a little more power, if there are fewer appliances, you can have a little less power, generally about 3000 can withstand the general household electricity, if there is ** air conditioning and other large electricity, at least 5000 or so power can be afforded.

Generator refers to the mechanical equipment that converts other forms of energy into electrical energy, which is driven by water turbines, steam turbines, diesel engines or other power machinery, and converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator, which then converts it into electrical energy.

Generators have a wide range of uses in industrial and agricultural production, national defense, science and technology, and daily life. There are many forms of generators, but their working principles are all based on the laws of electromagnetic induction and electromagnetic forces. Therefore, the general principles of its construction are:

Magnetic circuits and circuits that use appropriate magnetic and conductive materials to generate electromagnetic power and achieve the purpose of energy conversion.

Diesel Generators:

The diesel engine drives the generator to run, converting the energy of diesel into electricity.

In the cylinder of the diesel engine, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel injected by the fuel injector, and under the extrusion of the piston upward, the volume is reduced, and the temperature rises rapidly to reach the ignition point of the diesel. The diesel fuel is ignited, the gas mixture burns violently, and the volume expands rapidly, pushing the piston downward, which is called 'work'.

The above content refers to Encyclopedia-Generator.

1. Standby power.

In a certain period of time, the standard is that 1 hour out of every 12 hours can be overloaded by 10% on the basis of continuous power, and the unit power at this time is what we usually call the maximum power, that is, the standby power. Equivalent to the time-limited operating power (LTP) in the national standard and ISO standard. Generally, it is suitable for occasional emergency situations where there are many load changes such as communication and buildings.

2. Common power.

Common power is defined as the maximum power that exists in a variable power sequence with an unlimited number of hours of possible operation per year between defined maintenance intervals and under specified environmental conditions, which is equivalent to the basic power (PRP) in the national standard and ISO standard. Generally, it is suitable for factories, mines, military and other regular operating conditions with less load changes.

3. Continuous power.

The maximum power that a generator set can be used continuously within 24 hours is called continuous power. Equivalent to the continuous power (COP) in the national standard and ISO standard. Generally, it is suitable for continuous operation conditions with minimal load change, such as as being used as a power station or connected to the mains grid.

Diesel generator set is a kind of small power generation equipment, which refers to the power machinery that uses diesel as fuel and diesel engine as the prime mover to drive the generator to generate electricity. The whole unit is generally composed of diesel engine, generator, control box, fuel tank, starting and control battery, protection device, emergency cabinet and other components.

When users buy diesel generator sets, it is not enough to pay attention to its performance, fuel consumption and energy, etc., but also to understand the key points of diesel generator set power.

Main power. The main power of diesel generator set is also called continuous power or long line power, in China, the main power is generally used to identify the diesel generator set, and in the international is the use of standby power, also known as the maximum power to identify the diesel generator set, there are often irresponsible manufacturers in the market with the maximum power as continuous power to introduce and sell the unit, resulting in many users misunderstanding in these two concepts.

Continuous power. Diesel generator set in our country is the main power that is continuous power to nominatal, the maximum power that the generator set can be used continuously within 24 hours we call continuous power, and in a certain period of time, the standard is every 12 hours can be overloaded on the basis of continuous power 10, the unit power at this time is what we usually call the maximum power, that is, the standby power, that is, if you buy the main 400kw unit, If you buy a standby 400kw unit, if you don't overload the unit and usually open it at 400kw, in fact, the unit has been open in the overload state (because the actual rated power of the unit is only 360kw), which is very unfavorable to the unit, which will shorten the life of the unit and increase the failure rate.

Consumers need to be reminded that most of the standby power is used in the world, which is different from the domestic one, so there are often irresponsible manufacturers in the market who will swap the power of the two to introduce and sell units, deceive consumers, and be cautious when buying diesel generator sets.

The user needs to calculate the power of each electrical equipment and add it to obtain the total power of all electrical equipment to determine the total power of the diesel generator set. When choosing a diesel generator set, you can calculate the size of the load you need in advance, and then choose the generator set according to the load.

How to choose the power of diesel generator set depends entirely on the power of the equipment you bring!

Note: At present, the generator set for air compressors, welding machines, water pumps, mixers, air conditioners, etc. in the market needs to consider the starting current! Generally between times, Zhang Jialiang answered!

Diesel generator set capacity selection is carried out in two steps:

In the first step, the generator capacity is selected according to the sum of loads, and the voltage drop of the diesel generator under the impact of the load peak current is checked to make it not exceed the allowable value. The second step is to verify the capacity of the diesel engine, that is, under the impact of the load peak power (similar to the effective starting capacity of the motor), the diesel engine shall not stop the engine, but the dragged generator should start the load motor, that is, the power of the diesel engine must be greater than the peak power of the load. After completing the first step, you can find out how many times the peak load current is the load current, check the curve in the figure below, check the voltage drop, and see if the generator can meet the requirements.

In the second step, the peak power acting on the diesel engine shaft needs to be calculated and compared with the diesel engine braking power. This process is illustrated by taking a certain brand of diesel generator as an example (the diesel generator allows an instantaneous voltage drop of 20% at the terminal voltage). Choose a petbo diesel generator to supply power to the asynchronous motor with power of 15kw, 27kw, 27kw, 27kw, 45kw, 55kw, 95kw, and start in three starting sequences, Table 1 is to start according to the power of the motor from small to large, Table 2 is to start according to the power of the motor from large to small, and start in the order of starting current of the motor from large to small.

According to the load current, the primary selection of the main generator power is 360KW, and the model is CV360.