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Several details to pay attention to when the generator is running

发表时间:2018-12-14 Article source: Couch motor manufacturersPublished time: 2018-12-14

The function of the generator is very powerful. In the event of an emergency power failure, the generator helps us. However, when using the generator, there are many details that need attention. Many users do not pay attention to these details. This will cause some failures in the generator, so users must pay attention to details when using the generator.

Generator set refers to a small power generation device that can convert mechanical energy or other renewable energy sources into electrical energy.
Turbine-generator set and steam generator set.
In order to obtain higher power, the steam turbine is generally made of high speed, usually 3000 rpm (frequency is 50 Hz) or 3600 rpm (frequency is 60 Hz). Turbine speeds in nuclear power stations are relatively low, but they are also above 1500 rpm.
In order to reduce the mechanical stress due to centrifugal force and reduce wind friction, high-speed turbogenerators generally have smaller rotor diameters and larger lengths, that is, they use slender rotors. Especially for large-capacity high-speed units above 3000 rpm, the diameter of the rotor is severely restricted due to the connection of the data intensity, and generally cannot exceed 1.2 meters.
The length of the rotor body is restricted by the critical speed. When the length of the body reaches more than 6 times the diameter, the second critical speed of the rotor will be close to the working speed of the motor, and large oscillations may occur during work. Therefore, the size of large high-speed turbo-generator rotors is severely restricted.
The rotor size of an air-cooled motor of about 100,000 kilowatts has reached the above-mentioned limit. To increase the motor capacity, it can only be accomplished by adding the electromagnetic load of the motor. To this end, the cooling of the motor must be strengthened. Therefore, the turbo-generator units of more than 50,000 to 100,000 kilowatts have selected hydrogen cooling or water cooling technology with good cooling effect.
Since the 1970s, the maximum capacity of turbo-generator units has reached 1.3 to 1.5 million kilowatts. Since 1986, major breakthroughs have been made in the study of supercritical data at high critical temperatures. Superconducting skills are expected to be used in turbo-generators, which will make a new leap in the history of turbo-generator sets.
Generator set driven by a water turbine. Because of the different natural conditions of hydropower stations, the capacity and speed of hydro-generators vary greatly.
Generally, small-scale hydropower generators and high-speed hydropower generators driven by impact turbines use horizontal structures, while large and medium-speed generation generators mostly use vertical structures.
Because most hydropower stations are located far away from the city, power is generally required to be supplied to the load through longer transmission lines. Therefore, the power system has higher requirements for the working stability of hydro-generators: careful selection of motor parameters; Large moment of inertia is required. Therefore, the appearance of a hydro-generator is different from that of a turbo-generator. Its rotor has a large diameter and a short length.
The time required for the start-up and grid connection of a hydro-generator unit is short, and the work scheduling is sensitive. In addition to general power generation, it is particularly suitable as a peak shaving unit and a standby unit at the terminal. The maximum capacity of hydro-generators has reached 700,000 kilowatts.
In general, our common generator sets are generally driven by steam turbines, hydro turbines or internal combustion engines (such as gasoline engines, diesel engines and other engines), and in recent years, the renewable new energy sources include nuclear energy, wind energy, solar energy, biomass energy, and ocean energy.

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