Selection of emergency generators
Published Time:
2025-07-09
Emergency generators are generally recommended to use high-speed, turbocharged, low fuel consumption, and same capacity generator sets.
Emergency generators are generally recommended to use high-speed, turbocharged, low fuel consumption, and same capacity generator sets. High speed turbocharged diesel engines have a larger single unit capacity and occupy less space; Diesel engines are equipped with electronic or hydraulic speed control devices, which have good speed control performance; The generator should be selected with a synchronous motor equipped with brushless excitation or phase compound excitation device, which is more reliable, has a low failure rate, and is easier to maintain and repair; When the capacity of a single air conditioner or motor is large in the first level load, it is advisable to use a generator set with third harmonic excitation; The machine is assembled on a shared chassis with shock absorbers attached; Silencers should be installed at the exhaust pipe outlet to reduce the impact of noise on the surrounding environment. (1) Capacity determination: The emergency generator set is used for emergency needs and is often in standby emergency starting state. The continuous operation time is not long, generally not exceeding 8 hours. Therefore, the capacity can be determined according to the "standby power". The capacity of the emergency diesel generator set is determined based on the sum of the capacities of the first level load (excluding reserve capacity), taking into account the modified unit capacity and meeting the starting requirements of the largest electric motor in the first level load. Emergency generators are generally selected as three-phase AC synchronous generators, with a calibrated output voltage of 400V. (2) Determination of quantity: Generally, one automatic generator set with a speed of 1000-1500 revolutions per minute, brushless excitation, 400/230V, three-phase four wire with control screen, charging and discharging equipment, and shared chassis is selected. It is possible to request a shared chassis with a daily fuel tank to reduce piping and footprint. In addition, considering reliability, two units can also be connected in parallel for power supply. The number of emergency generator sets should generally not exceed 3. When selecting multiple units, it is advisable to choose complete sets of equipment with the same model and capacity, similar pressure and speed regulation characteristics, and consistent fuel properties for maintenance and shared spare parts.
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