Selection of common diesel generator sets

Some diesel generators are often used as a common power supply for electrical load at some time or in a long time. This type of generator is called a common generator set. The utility model can be used as a common unit and a standby unit. Away from the grid Township, island, forest, mining, oil and other regions or industrial and mining enterprises, in order to provide students and local residents living electricity plant, need to install diesel generator, the power generation group usually should be carried out continuously.

Important facilities such as national defense engineering, communication hubs, radio stations and microwave relay stations shall be equipped with standby diesel generating sets. Such facilities can be supplied by electricity and electricity mains. However, because of the earthquake, typhoon, war and other natural disasters and man-made factors, the city power grid suffered damage after a power outage, standby unit has been set should be started quickly, and adhere to long-term uninterrupted, in order to ensure these important projects with continuous power supply of power load, the standby generator also belong to the common type of power generation unit. The continuous operation time of the utility unit is long, and the load curve is changed greatly, and the selection of the unit capacity, the number of units and the type of the unit and the control mode of the unit are different from the emergency unit.

Determination of capacity of 1. common diesel generating set

According to the long-term continuous operation of the unit, the output power can satisfy the maximum load calculation of the whole project, and the reserve capacity of the generating set should be determined according to the importance of the load. The continuous output power of a diesel engine is usually 0.9 times the rated power.

Determination of unit number of 2. common diesel generator sets

The number of common diesel generator sets is usually more than 2, so as to ensure the continuity of power supply and the change of power load curve. With many units, it is possible to determine the number of units put into the generator according to the change of the electricity load, so that the diesel engine often operates under the economic load to reduce the fuel consumption and reduce the cost of power generation. The optimum operating state of the diesel engine is between 75%-90% of the rated power. In order to ensure the continuity of power supply, the commonly used unit itself should consider setting up the standby unit, when the unit maintenance or stop check, the generator can still meet the important load uninterrupted continuous power supply.

Determination of rotating speed of 3. common diesel generator set

In order to reduce the wear and tear and increase the service life of the unit, the common generator set should choose the medium speed and low speed units with a calibrated speed of no more than 1000r/min, and the standby units can choose the middle and high speed units. The units of the same power station should use the same type and the same capacity units, so that the same spare parts can be used to facilitate maintenance and management. A series of units with different capacities can also be used in projects with large load changes. The generator output calibration voltage is the same as that of the emergency generator set, usually 400V. The individual power consumption is large and the transmission distance is high. The high-voltage generator set can be used.

Control of 4. common diesel generator set

Commonly used units should be considered in parallel, in order to simplify the main wiring of the power distribution, so that the unit starts and stops rotating operation, through the car, transfer load, switch the unit without interrupting power supply. The unit shall be equipped with the measurement and control unit of the unit, and the speed regulation and excitation regulation of the unit shall be in accordance with the requirements of the parallel connection of the fish. An automatic diesel generator set should be used for the standby power generation unit with an important load. When the external power supply fails, the power supply can be quickly started automatically and the power supply for the important load will be resumed. When the diesel engine is running, the noise in the engine room is very large, and the automation unit is easy to be transformed into a generator set with automatic operation and automatic operation. When the generator unit is operating normally, the operator does not have to enter the diesel engine room, and the diesel generator set can be monitored in the control room.