How to choose common diesel generators?
The continuous working time of common generator sets, load curve changes, unit capacity, number, type selection and unit control method are different from emergency units.
(1) Determination of capacity: According to the continuous operation output power can meet the engineering calculation load selection, and the capacity of the standby unit of the generator set should be determined according to the importance of the load. The continuous output power of a diesel engine is generally 0.9 times the nominal power.
(2) Determination of the number of units: The general setting is usually more than two units to ensure the continuity of power supply and adapt to changes in the load curve of electricity consumption. Only a large number of units can determine the number of generators to be put into operation based on changes in the power load, so that diesel engines often operate under economic loads to reduce fuel consumption and reduce power generation costs. The economic operation status of the diesel engine is between 75% -90% of the rated power. In order to ensure the continuity of power supply, the common unit itself should consider setting up a standby unit.
(3) Determination of rotation speed: In general, high-speed units with a rotation speed of 1000 to 1500 rpm should be selected, and low-speed units with a rotation speed of 300 to 350 rpm are suitable for use as marine main engines.
(4) Determination of voltage: The determination of the output voltage of the generator is the same as that of the emergency generator set, which is generally 400V. Individual power consumption is different. High-voltage generator sets can be used for projects with long transmission distances.