When more than six times the diameter of the body length of the generator set manufacturer, the second critical speed of the rotor will be close to the motor running speed, running a large vibration may occur. Therefore, the size of large high-speed turbo-generator rotors are strictly limited. About 100,000 kilowatts air-cooled motor rotor size has reached its limit size above Weifang generator sets, again increasing the motor capacity only by increasing the electromagnetic motor load to achieve. So we must strengthen the cooling of the motor. So 5 to 10 million kw turbine generator have adopted better cooling hydrogen-cooled or water-cooled technology. Diesel generators can run a single unit can also be incorporated into multiple parallel operation and power system operation. Single units run by many conditions, limitations: if its power to meet the conditions required overloaded generator sets market prices, it will reduce the economics of plant operation at light load operation, and its standby unit also has the same capacity and operation of the unit. Using multiple units operating in parallel to the grid and running, you can expand the supply capacity and improve the reliability of power supply, which can have a spare unit generators, the relative reduction of spare capacity of the unit. Achieve parallel operation must meet the following four conditions: ① terminal voltage equal; ② equal frequency; ③ phase coherent; ④ phase sequence. But also have run protection devices, can automatically adjust the rational allocation and active and reactive power, the FM feature and surge characteristics between units tend to be close to. Weifang generators, turbines, generators, Weifang Huadong provided by Weifang Huadong Engine Co., Ltd. Weifang Huadong Engine Co., Ltd. (www.hdchai.com) strong, credible, Shandong Weifang engine industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve Weifang Huadong innovative ideas will lead into the brilliant and you work for a better future!