How to choose an emergency diesel generator group?

There are two features of the emergency diesel generator:
The first feature is to work urgently, and the time for continuous work is not long, and it is generally only necessary to run a few hours (≤ 12h);
The second feature is that the emergency generator set is in a stop-waiting state. Only when the main power is all duplex, the emergency diesel generator set starts operation and supply emergency electricity load. When the main power is returned to normal, then switch Stop.
(1) Determination of generator capacity of emergency diesel generator;
The calibration capacity of the emergency diesel generator set was a calibration capacity after the atmospheric correction, and its capacity should be able to meet the emergency power calculation load, and the capacity of the generator can meet the start of a single zui large-capacity motor in one level of load. Inspection. The emergency generator generally uses a three-phase AC synchronous generator with a calibration output voltage of 400V.
(2) Determination of the number of emergency diesel generator sets;
When there are multiple generator sets, only one emergency diesel generator set is generally set, and the 2 units can be used in parallel to power supply from reliability considerations. The number of generator sets supplied is generally not exceeding 3. When elected in multiple units, the unit should try to use the model, the same capacity, the pressure regulation, and speed control characteristics, the fuel properties used should be consistent for maintenance and common spare parts. When there is 2 sets of generator sets, the self-starting device should make the 2 units can be used alternate, that is, the market power failure is delayed, issued from the start command, if the first unit is 3 consecutive times The startup failed, the alarm signal should be issued and the second diesel generator is automatically started.
(3) Selection of emergency diesel generators;
The emergency unit should be used for high speed, pressurization, low fuel consumption, and diesel generator sets with the same capacity. High-speed supercharged diesel engine has a large single capacity, small space; diesel engine is used with electronic or hydraulic speed regulating device, which is better to speed up the speed; the generator should be used with synchronous motors without brush-free magnetic or phase-free devices, which is more reliable and faulty. Low rate, maintenance and maintenance is more convenient; when a single air conditioner capacity or motor capacity in the first-level load is large, the generator set of three harmonic extensions should be used; the machine is assembled on the shared chassis attached to the damper; The exhaust exit should be installed to reduce the impact of noise on the surrounding environment.
(4) Control of emergency diesel generator set;
The control of the emergency generator set should have a fast self-starting and automatic input device. When the main power failure is powered off, the emergency unit should quickly self-start and restore power, and the level of load allows power-off time from ten seconds to tens of seconds, should be determined depending on the specific situation. When the main power of the important engineering is powered off, the time should be determined by 3-5 s to avoid the time of instantaneous voltage reduction and the time of automatic investment of the city grid closing or the spare power supply, and then issue an instruction of the starting emergency generator set. . From the command, the unit starts starting, and the speed to the full load takes a period of time. Generally, the medium-sized diesel engine also needs pre-lubrication and heater, so that oil chairs, oil temperature, cooling water temperature during emergency loading, in line with the technical conditions of the factory; pre-lubrication and heater processes can be pre-carried out in advance according to different situations. For example, military communications, important foreign affairs activities of large-scale hotels, large-scale mass activities in public buildings, hospitals for important surgical surgery, etc., should be in pre-lubrication and warm-up state, so as to start at any time, try to shorten fault time .
After investing in the emergency unit, in order to reduce the mechanical and current impact of the processes, the emergency load zui increased by time interval. According to national standards and national military standards, the SHOU secondary allowed loading amount after the successful Success of the Automation unit is as follows: For the calibration power of no more than 250KW, the SHOU secondary allows the loading amount of not less than 50% calibration load; for the calibration power greater than 250KW, According to the technical conditions of the factory. If the instantaneous voltage drop and the transition process requires not strict, the general unit of the unloading load should not exceed 70% of the unit calibration capacity.

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