Abstract ： As the diesel generator set is widely applied in civil building as a standby power ， the scheme of container-type diesel generator and diesel generator room in building are compared and analyzed in terms of floor area ， cost ， transport ， operation and maintenance ； suggestions are proposed for using container-type diesel generator as standby power in civil building.
Key words ： container-type diesel generator ；standby power ； secondary load ； power supply reliability ； civil building ； diesel generator room ；municipal power ； calculated load
According to the Code for Electrical Design of Civil Buildings JGJ 16-2008 (hereinafter referred to as “Civil Code”) and the Code for Design Electric Power Supply Systems GB 50052-2009 (hereinafter referred to as “Code for Supply System”), the first-level load should be powered by the duplicate supply. When a power supply fails, the other one should not be failed at the same time; the power supply system of the second-level load should be powered by the double-loop circuit. Since the power-supply conditions are different in the project area, the civil buildings usually choose the following two types of back-up power supply schemes to ensure the supply reliability of the first-level load and the second-level load: use self-provided diesel generator or apply for the second 10kV municipal power supply.
When using the self-provided diesel generator, the common practice is to set a diesel generator room in the building. The generator room can be set on the first floor, in the first basement or the second basement, and cannot be set in the third basement. The site of the generator room should be close to the first-level load or the substation, and should not be set below or next to the toilet, bathroom or other places that are always filled with water. Since the first floors are usually expensive and the environmental effects should be considered, the generator rooms are usually set in the first basement or the second basement of the building, and that will cause a series of problems. According to the Table 6.1.3-1 The Requirement of the Net Distance (m) between Units and between the Outlines of Units and Walls in Civil Code, the occupied area and the passage area of generators are large. The area of supporting engineering, such as supporting downcast shafts, ventilation shafts, exit flues, oil storage rooms, transportation passageways and evacuation passageways should also be considered. However, the above-ground blinds of the downcast shafts and ventilation shafts will ruin the beauty of the exterior façade of the building, and it is difficult to set the exit flues on the exterior side of the building. Damp-proofing treatment, shock-absorbing treatment and sound-proofing treatment should be considered to protect the generators. The transport passage for equipments is limited, and the oil tank in the oil stora#ge room needs to be matched with the ventilator to the outside. As for designers, the above problems can be time-consuming and energy-consuming during the process of electrical design of civil buildings. In the meantime, it is hard to meet the ideal designed effect, so it needs to be compromised. However, adopting outdoor installation of the diesel generator in a given situation can solve the above problems.
The following is an example of the project designed by the author of this thesis, which compares the two schemes--use container-type generator unit or traditionally set diesel generator room--in the aspects of equipment investment, floor space, operation and maintenance, to analyze how to make the reasonable choice between different schemes about diesel generator unit, thus provide referable and useful methods for electrical engineers in the design of specific types of projects.