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About the selection of emergency diesel generator sets
Article source:this site | Issuing time：2019-04-09
Emergency diesel generator sets are mainly used in important places. In the event of a power outage or emergency, the emergency generator sets can quickly restore and extend the power supply time. This type of electrical load is called a primary load. Communication equipment, instruments, and computer systems that have strict requirements for power outage time should be equipped with batteries or UPS for power supply in addition to generating sets.
The emergency generator set has two characteristics: one is for emergency use, the continuous working time is not long, generally only needs to run continuously for a few hours (≤12h); the second is for backup, the emergency generator set is usually in shutdown waiting state, only When the main power supply fails, the emergency generator set will start running to supply the emergency power load. When the main power supply returns to normal, it switches to shutdown immediately.
Determination of emergency diesel generating set capacity
The calibrated capacity of emergency diesel generator set is the 12h calibrated capacity corrected by the environment (altitude, atmospheric pressure, air temperature, etc.), and its capacity should meet the total calculated emergency power load, and the generator capacity can meet the first-class load The requirements for starting a single maximum capacity motor are verified. Emergency generators generally use three-phase AC synchronous generators with a calibrated output voltage of 400V.
Determination of the number of emergency diesel generator sets
When there are multiple generator sets in standby, generally only one emergency diesel generator set is set up. In consideration of reliability, it is also possible to select two sets to operate in parallel for power supply. Generally, the number of emergency generating sets should not exceed 3. When multiple diesel generators are selected, the unit should try to select complete sets of equipment with the same model and capacity, 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 there are two emergency generating units, the self-starting device should enable the two units to stand by each other, that is, after the mains power failure and power failure are confirmed after a delay, a self-starting command will be issued. If the first unit automatically starts three times in a row If the startup fails, an alarm signal should be issued and the second unit should be automatically started.
Selection of characteristics of emergency diesel generator set
The emergency unit should be high-speed, pressurized, low fuel consumption, high-reliability, and the same capacity diesel generator set. High-speed supercharged diesel engines have a large single engine capacity and occupy a small space; diesel engines equipped with electronic or hydraulic speed control devices are better, and their speed control performance is better; generators should be equipped with brushless excitation synchronous motors for reliable operation and failure rate Low, maintenance and repair is more convenient, the machine is assembled on a common bottom device with a shock absorber; a muffler should be installed at the outlet of the smoke exhaust pipe to reduce the impact of noise on the surrounding environment.
Control of emergency diesel generator set
The control of emergency diesel generator sets shall have quick self-starting and automatic input devices. When the main power supply fails and the power is cut off, the emergency unit should be able to quickly self-start and restore the power supply. The allowable power-off time for the first-class load ranges from ten seconds to tens of seconds, which should be determined according to the specific conditions. When the main power supply of an important project is cut off, there must be a confirmation time of 3~5s first to avoid instantaneous voltage drop and the time when the city grid is switched on or the standby power is automatically turned on. Generally, large and medium-sized diesel generator sets also need pre-lubrication And the warm-up process, so that the pressure of the total loss system oil (oil), the temperature of the total loss system (oil), and the cooling water temperature during emergency loading meet the requirements of the product technical conditions; the pre-lubrication and warm-up process of the unit can be based on Advance in different situations.
The emergency generator set has two characteristics: one is for emergency use, the continuous working time is not long, generally only needs to run continuously for a few hours (≤12h); the second is for backup, the emergency generator set is usually in shutdown waiting state, only When the main power supply fails, the emergency generator set will start running to supply the emergency power load. When the main power supply returns to normal, it switches to shutdown immediately.
Determination of emergency diesel generating set capacity
The calibrated capacity of emergency diesel generator set is the 12h calibrated capacity corrected by the environment (altitude, atmospheric pressure, air temperature, etc.), and its capacity should meet the total calculated emergency power load, and the generator capacity can meet the first-class load The requirements for starting a single maximum capacity motor are verified. Emergency generators generally use three-phase AC synchronous generators with a calibrated output voltage of 400V.
Determination of the number of emergency diesel generator sets
When there are multiple generator sets in standby, generally only one emergency diesel generator set is set up. In consideration of reliability, it is also possible to select two sets to operate in parallel for power supply. Generally, the number of emergency generating sets should not exceed 3. When multiple diesel generators are selected, the unit should try to select complete sets of equipment with the same model and capacity, 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 there are two emergency generating units, the self-starting device should enable the two units to stand by each other, that is, after the mains power failure and power failure are confirmed after a delay, a self-starting command will be issued. If the first unit automatically starts three times in a row If the startup fails, an alarm signal should be issued and the second unit should be automatically started.
Selection of characteristics of emergency diesel generator set
The emergency unit should be high-speed, pressurized, low fuel consumption, high-reliability, and the same capacity diesel generator set. High-speed supercharged diesel engines have a large single engine capacity and occupy a small space; diesel engines equipped with electronic or hydraulic speed control devices are better, and their speed control performance is better; generators should be equipped with brushless excitation synchronous motors for reliable operation and failure rate Low, maintenance and repair is more convenient, the machine is assembled on a common bottom device with a shock absorber; a muffler should be installed at the outlet of the smoke exhaust pipe to reduce the impact of noise on the surrounding environment.
Control of emergency diesel generator set
The control of emergency diesel generator sets shall have quick self-starting and automatic input devices. When the main power supply fails and the power is cut off, the emergency unit should be able to quickly self-start and restore the power supply. The allowable power-off time for the first-class load ranges from ten seconds to tens of seconds, which should be determined according to the specific conditions. When the main power supply of an important project is cut off, there must be a confirmation time of 3~5s first to avoid instantaneous voltage drop and the time when the city grid is switched on or the standby power is automatically turned on. Generally, large and medium-sized diesel generator sets also need pre-lubrication And the warm-up process, so that the pressure of the total loss system oil (oil), the temperature of the total loss system (oil), and the cooling water temperature during emergency loading meet the requirements of the product technical conditions; the pre-lubrication and warm-up process of the unit can be based on Advance in different situations.
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