06 九 10 Wind turbine gearbox fault diagnosis
Through different gearbox vibration spectrum analysis of test results, discusses the gear box to judge due to the long those in certain adverse conditions, such as alternating load or lubricant failure, causing the gear and bearing damage detection methods. Analysis of the gear box failure causes and measures to be taken.
Keywords: wind turbine gear box bearing condition monitoring
A wind turbine gearbox structure and operating characteristics
China wind generator installed in most of the import unit. In recent years, a number of gearbox failure, some from the factory replacement, and some by domestic professional factory gear box was repaired. Some wind up gear box failure rate of 40 to 50, very few brands unit gear box replacement rate is almost close to 100. Although the gear box damage occurred not only in our midst, many places around the world as there have been problems, but China’s current wind turbine failures in the operation of a large proportion already, should be carefully analyzed.
1) In the past small-capacity wind turbine generator gearbox to use more parallel growth structure of helical gear, gear box was in order to avoid excessive cost, weight, size too large, 500kW wind turbine over more than for the parallel axis gear wheel and the planet hybrid structure. As the growing wind turbine capacity, hub height increases, the gear box is complicated by force, so that may be causing some gearbox design is defective.
2) Since some parts of our topography, climate characteristics of specificity compared with Europe, the standard design may be the normal operation of gear box has a certain influence. Most of China’s wind farm in the mountainous or hilly areas, especially along the southeast coast and islands, the varied topography topographic effects caused by the occurrence of flow of distortion, resulting in the addition level of the wind round on the outside there are radial air flow component. Significant parts of our country gust factors influenced the airflow, the wind turbine mechanical power transmission system, the often exceed their design limit conditions. As power transmission devices – gear box, due to the instability of air flow, resulting in a complex gearbox long-term working under alternating load. Since the equipment installed in tens of meters high altitude, can not easily take them to the factory maintenance, so you can monitor Jingchang Jinxingzhuangtai promptly identify problems in time processing, Huan Chu Xian failure can be analyzed from the symptom to the total failure of to promptly arrange Jian Xiu.
3) In northern China, winter air temperature is very low, some of the extreme wind (short) minimum temperature reached -40 ℃ below the small wind turbines ‘> generators to run the design minimum temperature at -20 ℃ or more, individual low-temperature wind Motors’> generators low as -30 ℃. If you run a long time at low temperatures, the damage to wind turbine ‘> wind generators in parts, such as gear boxes. The gear must be heated. Gearbox heat longer because when the wind speed lower or stop the wind, the gear oil temperature is too low because of become crowded, especially by splash lubrication part, can not be adequate lubrication, resulting in gear or bearing short lack of lubrication and damage. If the cabin temperature is very low, then the pipeline will occur in the oil flow are not clear, so when the gear box oil pipelines can not reach the radiator, gear oil temperature will rise until the shutdown.
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Tags: wind turbine
