Diesel generator set purchase strategy: how to choose a high-quality diesel generator set?

The standard open-frame diesel generator set is generally composed of four parts: diesel engine, generator, control system and other accessories. At present, diesel generator sets are widely used in various fields, but because diesel generator sets are a relatively complex mechanical equipment, Many users don't know much about diesel generator sets. When they buy diesel generator sets, they don't know how to distinguish them. It is easy to buy fake and inferior products. Therefore, users must know how to choose a high-quality diesel generator set.

Diesel generator sets

 

       The standard open-frame diesel generator set is generally composed of four parts: diesel engine, generator, control system and other accessories. At present, diesel generator sets are widely used in various fields, but because diesel generator sets are a relatively complex mechanical equipment, Many users don't know much about diesel generator sets. When they buy diesel generator sets, they don't know how to distinguish them. It is easy to buy fake and inferior products. Therefore, users must know how to choose a high-quality diesel generator set. Below, Dingbo Power will introduce the purchase strategy of diesel generator sets from the four structural aspects of diesel generator sets.

 

       1. Diesel engine

       The diesel engine is the power output part of the entire unit, accounting for 70% of the cost of the diesel generator set. It is the most falsified link by some unscrupulous manufacturers. Users may buy inferior units such as counterfeit machines or refurbished machines. There are similar brands of machines, which confuse the audience, so users must keep their eyes open and carefully screen.

 

       fake deck

       At present, almost all well-known diesel engines on the market have imitation manufacturers. Some manufacturers use these imitation machines with the same appearance to pretend to be famous brands, and use the means of making fake brand names, printing real serial numbers, and printing fake factory materials to achieve the purpose of greatly reducing costs. . It is difficult for non-professionals to distinguish deck machines.

 

       Refurbished machine

       All brands have refurbished old machines, and it may be difficult for non-professionals to distinguish them.

       However, there are still some flaws in the refurbished machine, such as paint, especially the dead corner paint, which is difficult to be consistent with the original.

 

       Similar brand machine, confusing audiovisual

       These manufacturers are opportunistic, and dare not make counterfeit machines or refurbished machines.

       For example, some manufacturers use pinyin or homophones to register their own brands. XX Cummins generator set company, etc., actually has nothing to do with Cummins engines, but only registered the name of XX Generator Co., Ltd., which has nothing to do with the "Cummins" trademark. The configured generator sets are always called a certain Cummins generator set to the outside world.

 

       small horse-drawn cart

       Confuse the relationship between KVA and KW. Treat KVA as KW to exaggerate power and sell it to customers. In fact, KVA is commonly used abroad, and KW is the effective power commonly used in China. The relationship between them is 1KW=1.25KVA. Imported units are generally expressed in KVA, while domestic electrical equipment is generally expressed in KW, so when calculating power, KVA should be converted into KW at a 20% discount.

       Don't talk about the relationship between common (rated) power and standby power, just say one "power", and sell the standby power as common power to customers. In practice, standby power = 1.1x normal (rated) power. Also, the backup power can only be used for 1 hour out of 12 hours of continuous operation.

 

       2. Generator

       The function of the generator is to convert the power of the diesel engine into electrical energy, which is directly related to the quality and stability of the output power.

 

       stator coil

       The stator coil was originally made of all copper wire, but with the improvement of wire making technology, copper-clad aluminum core wire appeared. Different from copper-plated aluminum wire, copper-clad aluminum core wire is made of copper-clad aluminum when drawing the wire using a special mold, and the copper layer is much thicker than copper-plated. The performance of the generator stator coil using copper-clad aluminum core wire is not much different, but the service life is much shorter than that of the all-copper wire stator coil.

 

       Excitation method

       The excitation mode of the generator is divided into phase compound excitation type and brushless self-excitation type. The brushless self-excitation type has become the mainstream with the advantages of stable excitation and simple maintenance, but there are still some manufacturers who configure phase compound excitation generators in generator sets below 300KW due to cost considerations.

 

       3. Control system

       Ordinary standard units need to be manually switched off, and it generally takes 10 to 30 minutes from the power outage to the start of the diesel generator set.

       Diesel generator set automation control is divided into semi-automatic and fully automatic unattended type. Semi-automatic is the automatic start of the generator set when the power is cut off, and the automatic stop when the power is received. The automatic unattended control panel is equipped with an ATS dual power switch, which directly and automatically detects the mains signal, automatically switches, and controls the automatic start and stop of the generator set, realizing fully automatic unattended operation, and the switching time is 3-7 seconds. tune.

       Hospitals, military, fire fighting and other places that need to transmit electricity in time must be equipped with automatic control panels.

 

       4. Accessories

       The standard accessories of regular diesel generator sets are composed of batteries, battery wires, mufflers, shock absorbers, air filters, diesel filters, oil filters, bellows, connecting flanges, and oil pipes. The accessories can be faked. There are also many.