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)容量的確認:發(fā)電機組作應(yīng)急用，經(jīng)常處于待機應(yīng)急起動狀態(tài)，連續(xù)運轉(zhuǎn)的時刻不長，一般不超過8h，因而可按"備用功率"來確認容量。按負荷的容量之和(不計備用容量)，考慮經(jīng)修正后的機組容量，并能滿意負荷中大的一臺電動機的起動要求，據(jù)此以確認應(yīng)急發(fā)電機組的容量。應(yīng)急發(fā)電機一般選用三相溝通同步發(fā)電機，其標定輸出電壓為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)臺數(shù)的確認:一般選用1臺自動化、轉(zhuǎn)速1000~1500轉(zhuǎn)/分、無刷勵磁、400/230V、三相四線帶操控屏、充放電設(shè)備及共用底盤的發(fā)電機組?？梢蠊灿玫妆P帶日用油箱，以削減管路和占用面積。別的從牢靠性考慮也能夠選用2臺機組并聯(lián)進行供電。供給急用的發(fā)電機組臺數(shù)一般不宜超過3臺。當(dāng)選用多臺機組時，機組應(yīng)盡量選用類型、容量相同，調(diào)壓、調(diào)速特性相近的成套設(shè)備，所用燃油性質(zhì)應(yīng)一致，以便進行修理保養(yǎng)及共用備件。

(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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