In the purchase of diesel generator set should fully consider the comprehensive performance and economic indicators of diesel generator set, the supplier’s dedication, geographical location and actual professional degree, whether the supplier has after-sales service means, such as rush repair vehicles, special machinery and tools. Then consider whether the power of the selected unit matches the power of the electricity load. Generally: unit rated power X0.8 = power of electrical equipment to select the unit power as well. If there are large and medium-sized motors, 2-5 times of starting current should be considered. If the unit is mainly used to charge the UPS, the generator rating must be determined after a professional consultation based on the UPS condition.
Before selecting the diesel generator set, we should first clarify the relationship between the five high power parameters of the diesel generator set, that is, the apparent power, active power, rated power, maximum power and economic power, many people will confuse their definition, here to help you sort out for everyone to understand.
(1) The unit of apparent power is KVA, which is used to express the capacity of transformers and UPS in China.
(2) The active power is 0.8 times of the apparent power, and the unit is KW. It is used for power generation equipment and electrical equipment in China.
(3) The rated power of the diesel generator set refers to the power of continuous operation for 12 hours.
(4) The maximum power is 1.1 times of the rated power, but only one hour can be used within 12 hours.
(5) The economic power is 0.75 times the rated power, is the output power of the diesel generator set without time limit can run for a long time. At this power, the fuel is the most economical and the failure rate is the lowest.
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 size.
1. first of all to distinguish the difference between the apparent power and effective power of the diesel generator set, the relationship between them is 1KVA=0.8KW, imported units are generally expressed in KVA power unit, and domestic electrical equipment are generally expressed in KW, so the accounting power should be converted to KVA by 8%.
2. Secondly, the rated power and maximum power of the diesel generator set to be selected need to be determined.
3, in addition, determine the power of the generator set is not a simple sum of all the electrical power, but also need to consider the starting mode of the electrical appliances. General start mode is divided into direct start and step-down start or frequency conversion start, the former start current is about 6 times the working current, instantaneous power will reach 6 times the rated power; The latter start current is about 3 times, instantaneous power is also 3 times rated power. Therefore, when selecting the power of the generator set, in addition to the sum of the power of all the appliances, we also need to consider the starting power of each appliance.
Warm tip: Under normal circumstances, 0.8 times of the output power of the diesel generator set is the output power of the actual generator set. In this way, the generator set can not only keep overload operation, but also ensure that the generator set will not run under long-term load, so as to prolong the service life of the diesel generator set. In addition, the diesel generator set is a non-continuous operation of power generation equipment, if the continuous operation of more than 12 hours, its output power will be lower than the rated power of about 90%. If the user needs a long time of uninterrupted use, it is necessary to configure the common type of generator set, that is, the generator set should take into account the power decline of the long time working unit.
Jiangsu Meiao Power Technology Co., Ltd. is an important manufacturer of diesel generators. Us ao-generator set manufacturers mainly manufacture and sell diesel generator sets, the power of generator sets is 3-3000KW, mobile station is 24-600KW, Marine emergency diesel generator set 24-800KW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, silent speaker, mobile lighthouse, container, etc.) diesel generator Group at the same time engaged in generator set maintenance and generator set accessories after-sales service.
