How to Select Emergency Generator Sets

May. 30, 2023

1. Selection of emergency diesel generator


The emergency diesel generator is mainly used in important places. In case of emergency or emergency power failure, the power will be cut off immediately, and it will be recovered quickly through the emergency generator set.


The work of emergency diesel generator has two characteristics:

The first characteristic is to respond to urgent needs, and the continuous working time is not long, usually only requiring a few hours of continuous operation (≤ 12H);

The second feature is standby. The emergency generator set is usually in a state of shutdown and waiting. Only when all the main power supply drums are cut off, the emergency diesel generator set can start to operate to supply emergency power load. When the main power supply returns to normal, it will switch to shutdown immediately.


(1) Determination of generator capacity of emergency diesel generator

The calibrated capacity of emergency diesel generator set is the calibrated capacity of 12h after atmospheric correction. Its capacity shall meet the total calculated load of emergency power, and shall be calibrated according to the requirement that the generator capacity can meet the starting requirements of single motor with the largest capacity in the first level load. Emergency generators generally use three-phase AC synchronous generators, with a rated output voltage of 400V.


Shangchai diesel generator


(2) Determination of the number of emergency diesel generator sets

When there are several generator sets for standby, generally only one emergency diesel generator set is set. Considering the reliability, two generator sets can also be used for power supply in parallel. The number of urgently needed power generation units should generally not exceed 3. When selecting multiple units, the unit should try to choose a complete set of equipment with the same model and capacity, similar voltage and speed regulation characteristics, and the properties of the fuel used should be consistent for maintenance and shared spare parts. When there are two generator sets in urgent need, the self starting device shall enable the two units to be standby for each other, that is, after the delay confirmation of mains power failure, the self starting command will be issued. If the first unit fails to self start for three consecutive times, the alarm signal will be issued and the second diesel generator will be started automatically.


High speed, supercharged, low fuel consumption diesel generator set with the same capacity should be selected as emergency generator. The high-speed turbocharged diesel engine has a large single unit capacity and occupies little space; The diesel engine is equipped with an electronic speed control device, which has good speed control performance; The generator should be equipped with a brushless excitation synchronous motor, which is more reliable, has a low failure rate, and is more convenient for maintenance and repair; A muffler should be installed at the outlet of the smoke exhaust pipe to reduce the impact of noise on the surrounding environment.

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