Oil generator set is a power supply equipment that uses diesel engine as power to drive three-phase AC synchronous generator for power generation. When normal power supply cannot be realized or sudden power failure occurs, the diesel generator set can provide stable and reliable power. In some special occasions, such as the emergency power failure of the bank and the power relay station, it is not allowed to play a more important role in the backup of the power generation unit in the hospital. At present, it is widely used in field power supply, emergency power supply and backup power supply in many fields such as communication, mining, railway, hospital, finance, scientific research, road construction, industrial and agricultural production, urban construction and life.

目前，国内使用柴油发电机组的功率范围比较广，小到0.5千瓦，大到几千千瓦，据统计，国内使用较多的机组有10kW、20kW、40kW、50kW、75kW、120kW和200kW等。机组的型号多种多样，常用的有柴油发电机组，国产135系列柴油发电机组。

At present, the power range of diesel generator sets used in China is relatively wide, ranging from 0.5KW to thousands of kW. According to statistics, the units used more in China include 10kW, 20kW, 40kW, 50KW, 75kW, 120kw and 200kW. There are many types of units, including diesel generator sets and domestic 135 series diesel generator sets.

目前各行业对柴油发电机组的要求大致相同:操作简单，故障率低，能随时起动、及时供电，运行可靠，油耗低，噪声小，发电机的供电电压和频率应能满足用电设备的要求。若机组不能达到以上技术要求，将影响用电设备的正常工作。例如柴油机在工作中出现转速不稳定的故障时，发电机发出的电压和频率就会时高时低。这会造成许多问题:通信部门使用的UPS会发出警报；照明灯会忽亮忽暗；邮电部门进行电传电报时，会引起变字和传真图像出现严重失真；电压、频率不稳严重时会烧坏用电设备。为满足各行业对柴油发电机组的技术要求，操作人员和维修技术人员掌握柴油发电机组的构造、原理、性能和维修技术知识，熟练地操作使用、维护和修理柴油发电机组。

At present, the requirements of various industries for diesel generator sets are roughly the same: simple operation, low failure rate, starting at any time, timely power supply, reliable operation, low fuel consumption and low noise. The power supply voltage and frequency of the generator should meet the requirements of electrical equipment. If the unit fails to meet the above technical requirements, the normal operation of electrical equipment will be affected. For example, when the speed of the diesel engine is unstable during operation, the voltage and frequency sent by the generator will be high and low. This will cause many problems: the UPS used by the communication department will give an alarm; The lamp will flicker on and off; When the post and Telecommunications Department conducts telex and telegram, it will cause word change and serious distortion of fax image; When the voltage and frequency are unstable, the electrical equipment will be burned out. In order to meet the technical requirements of various industries for diesel generator sets, operators and maintenance technicians master the structure, principle, performance and maintenance technical knowledge of diesel generator sets, and skillfully operate, use, maintain and repair diesel generator sets.

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