Selection methods for emergency diesel generator sets:
Emergency diesel generators are mainly used in important places. After an emergency or accident power outage, they can quickly restore power and extend the power supply time for a period of time through emergency generator sets. This type of electrical load is called a first-level load. For equipment, instruments and computer systems with strict requirements for power-off time, in addition to being equipped with generators, batteries or UPS power supply should also be provided.
The operation of emergency diesel generators has two characteristics:
The first feature: It is used for emergency purposes and does not require continuous operation for a long time. Generally, it only needs to run continuously for a few hours (≤12 hours).
The second feature: As a backup, the emergency generator set is usually in a state of shutdown and waiting. Only when the main power supply is completely blocked and power is cut off will the emergency diesel generator set start to supply the emergency power load. Once the main power supply returns to normal, it will immediately switch and shut down.
A. Determination of generator capacity; The rated capacity of the emergency diesel generator set is the 12-hour rated capacity after atmospheric correction. Its capacity should be able to meet the total calculated load of the emergency power supply and be verified according to the requirement that the generator capacity can meet the starting requirements of a single rated capacity motor in the first-level load. Emergency generators generally choose three-phase AC synchronous generators, with a rated output voltage of 400V.
B. Determination of the number of emergency diesel generator sets; When there are multiple generator sets on standby, generally only one emergency diesel generator set is set up. Considering reliability, two generator sets can also be connected in parallel for power supply. The number of urgently needed generator sets should generally not exceed three. When multiple generator sets are selected, they should be chosen as many as possible.
For complete sets of equipment with the same model and capacity and similar voltage regulation and speed regulation characteristics, the nature of the fuel used should be consistent to facilitate maintenance and repair as well as the sharing of spare parts. When there are two urgently needed generator sets, the self-starting device should enable the two units to serve as backups for each other. That is, after a delay confirmation due to a power failure of the municipal power supply, a self-starting command should be issued.
For more questions about the generator set, please call the Beidou Power team. More than ten years of professional production and sales of power generation equipment experience, more professional engineer team to serve you, choose Beidou power is to choose rest assured, welcome on-site factory inspection.
Post time: Sep-26-2025