What Should Enterprise Buying Emergency Diesel Generator Sets Pay Attention to

by Dieselgenerator Tech ***

Emergency diesel generator sets are mainly used for continuous working time not long, generally only need to run continuously for a few hours (maximum 12 hours), or only use emergency diesel generator sets for emergency use when the power supply fails. At present, some large industrial enterprises and civil construction projects should be equipped with emergency diesel generator sets for units or projects powered by electric loads. Do you know what issues should be paid attention to when companies choose to purchase emergency diesel generator sets?


1. Determining the capacity of emergency power station generator set.


The rated capacity of the emergency diesel generator set is the 12h calibrated capacity after atmospheric correction, and its capacity should be able to meet the total calculation load of the emergency power consumption of the whole project, and the capacity of the generator set can meet the requirements of a single motor with the largest capacity in the first-class load. A verification is required.The rated output voltage of emergency generators is usually selected as three-phase 400V. High-voltage generators should not be used. High-voltage generators can be considered for projects with large power loads and long transmission distances.


2. Determining the number of emergency power station generator sets.


Most emergency power stations generally only have one emergency diesel generator set. For reliability considerations, two units can also be operated in parallel for power supply. Generally, the number of units of each emergency power station should not exceed three. When multiple diesel generator sets are selected, the sets should try to select complete sets of equipment with the same model and capacity, and similar pressure and speed regulation characteristics, and the nature of the fuel used should be the same for operation, maintenance, and sharing of spare parts.When an emergency power station is equipped with two generating units, the self-starting device should enable the two units to be mutually backup, that is, the mains power supply fails and the power is cut. After the delay is confirmed, the self-starting command will be issued. If the first unit is three consecutive times If self-starting fails, an alarm signal should be issued and the second unit should be started automatically.

What Should Enterprise Buying Emergency Diesel Generator Sets Pay Attention to

3. Diesel generator set selection.


Emergency diesel generator sets should use high-speed diesel generator sets with supercharger and low fuel consumption. Compared with diesel generator sets of the same capacity, the higher the rated speed, the lighter the weight, the smaller the volume, and the smaller the space occupied. It can save the construction area of the power station; the diesel engine with a supercharger has a larger single unit capacity and a smaller volume;Choose a diesel engine with electronic or hydraulic speed control device, which has better speed control performance; generator should choose a synchronous motor with brushless excitation or phase compound excitation device, which is more reliable in operation, low in failure rate, and more convenient for maintenance and repair; when used as a first-class load When the capacity of a single maximum motor is larger than the capacity of the generator, a generator set with third harmonic excitation should be used: diesel engine and generator should be assembled on a common chassis with shock absorber for installation in the power station: exhaust pipe outlet A muffler should be installed to reduce the impact of noise on the surrounding environment.


4. Control of emergency diesel generator set.


The control of emergency diesel generator sets shall have quick self-starting and automatic switching-in devices. When the main power supply fails and the power is cut off, the emergency unit should be able to quickly self-start to restore the power supply. The allowable power-off time for the class load ranges from ten to several tens of seconds, which should be determined according to the specific conditions. When the main power supply of an important project is cut off, the confirmation time of 3~5s should be passed first to avoid the instantaneous voltage drop and the time of reclosing of the city grid or automatic input of the backup power supply, and then send out the emergency diesel generator set. instruction. It takes some time from the time the command is issued, the unit starts to start, and the speed increases until it can carry the load.Generally, large and medium-sized diesel engines also need pre-lubrication and warm-up processes, so that the oil pressure, oil temperature, and cooling water temperature during emergency loading meet the requirements of product technical conditions. The pre-lubrication and warm-up process can be carried out in advance according to different situations. For example, when there are important foreign affairs activities in large hotels, large-scale mass gatherings at night in public buildings, and important surgical operations in hospitals, etc. The emergency power stations of some important factories or projects usually keep the emergency diesel generator set in the pre-lubrication and warm-up state, so as to prevent the time and start quickly, and try to shorten the time of failure and power failure.


After the emergency unit is put into operation, in order to reduce the mechanical and current impact when the load is suddenly added, the emergency load should be increased in steps according to the time interval when the power supply requirements are met. According to national standards, the first allowable load capacity of an automated diesel generator set after a successful start is not less than 50% of the rated load for those with a rated power of not more than 250kW; for those with a rated power of more than 250kW, it shall be specified in accordance with the product technical conditions. If the requirements for the instantaneous voltage drop and the transition process are not strict, the general load capacity of the unit suddenly added or unloaded should not exceed 70% of the unit's rated capacity.


The above are some precautions for the selection of emergency diesel generator sets. To purchase emergency diesel generator sets, welcome to Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. Dingbo Power has an outstanding technical team led by several experts. In recent years The company continuously introduces advanced technology and equipment, and actively absorbs the latest achievements in machinery, information, materials, energy, environmental protection and other high-tech and modern system management technologies, and comprehensively applies them to product development and design, manufacturing, testing, and management The whole process of manufacturing and after-sales service, so as to realize the high-quality, high-efficiency, low-consumption, and agile manufacturing of diesel generator sets, and ranks among the forefront of the diesel generator industry.


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Created on Jul 21st 2023 19:53. Viewed 96 times.


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