Generally, the emergency generator set should be diesel generator set with high speed, pressurization, low fuel consumption and the same capacity. High speed turbocharged diesel engine has large capacity and small space; The generator set is equipped with electronic or hydraulic speed regulation equipment, with good speed regulation function; Synchronous motors equipped with brushless excitation or phase compound excitation equipment should be selected for the generator set, which have reliable operation, low failure rate and convenient maintenance and repair; When the capacity of a single air conditioner or motor in the load is large, the generator set with third harmonic excitation should be selected; The machine is assembled on a common chassis with shock absorbers; A muffler should be installed at the outlet of the smoke exhaust pipe to reduce the impact of noise on the surrounding environment.

(1)容量的确认:发电机组作应急用，经常处于待机应急起动状态，连续运转的时刻不长，一般不超过8h，因而可按"备用功率"来确认容量。按负荷的容量之和(不计备用容量)，考虑经修正后的机组容量，并能满意负荷中大的一台电动机的起动要求，据此以确认应急发电机组的容量。应急发电机一般选用三相沟通同步发电机，其标定输出电压为400V。

(1) Confirmation of capacity: the generator set is in emergency use, often in standby emergency starting state, and the continuous operation time is not long, generally not more than 8h. Therefore, the capacity can be confirmed according to "standby power". According to the sum of load capacity (excluding standby capacity), the corrected unit capacity is considered, and the starting requirements of a motor with large load can be satisfied, so as to confirm the capacity of emergency generator set. The emergency generator generally adopts three-phase communication synchronous generator, and its rated output voltage is 400V.

(2)台数的确认:一般选用1台自动化、转速1000~1500转/分、无刷励磁、400/230V、三相四线带操控屏、充放电设备及共用底盘的发电机组。可要求共用底盘带日用油箱，以削减管路和占用面积。别的从牢靠性考虑也能够选用2台机组并联进行供电。供给急用的发电机组台数一般不宜超过3台。当选用多台机组时，机组应尽量选用类型、容量相同，调压、调速特性相近的成套设备，所用燃油性质应一致，以便进行修理保养及共用备件。

(2) Confirmation of the number of units: generally, one generator set with automation, rotating speed of 1000 ~ 1500 rpm, brushless excitation, 400 / 230V, three-phase four wire with control panel, charging and discharging equipment and common chassis is selected. Common chassis with daily oil tank can be required to reduce pipeline and occupied area. In addition, in consideration of reliability, two units can also be selected for parallel power supply. Generally, the number of generator units for emergency use should not exceed 3. When multiple units are selected, complete sets of equipment with the same type and capacity and similar pressure regulation and speed regulation characteristics shall be selected as far as possible, and the properties of fuel used shall be consistent for repair and maintenance and sharing of spare parts.

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