The wind turbine to normal operation, reduce failure, avoid the occurrence of major accidents, box, box transformer protection quality of function status, the box changes and wind turbine facilities has an important relationship.

For the fire accident of electrical fire, first cut off the power supply, to avoid accident expansion and burning accident unit. The fire accident of wind turbine should be based on prevention, comprehensive consideration, to prevent and avoid the malignant accident.

If the frequency converter is arranged in the compartment above, because between the unit and the box substation line to engine room, if the protection function of box substation is not perfect, when the cable breakage, more easy to cause the unit burning accident, box transformer protective effect on unit becomes more and more important.

The wind turbine burning accidents, due to the low pressure side of the circuit breaker box transformer substation has not automatic tripping function, when the transducer can not be off network is normal, the box changes could not timely power generator, thereby causing persistent fever, reached the cabin combustible ignition caused by machine group burnout accident. From the practice of multiple wind farms, if box transformer low-voltage side circuit breaker with automatic tripping function, general will only make the inverter Crowbar (low voltage ride through) burned, power module is damaged, the damage severity and box transformer low-voltage side circuit breaker tripping time degree have much; when the low-voltage side circuit breaker tripping box substation is not timely, can occasionally lead to the damage of generator.

Another example: in February 26, 2010 the 1.5MW wind turbine, wind farm, wind farm duty is found at the top of the wheel hub, engine 59 units of black smoke, sixteen nine arrived at the scene, on February 27th at five twenty in the morning, the flame is extinguished, all burn unit. The cause of the accident in the cabinet at the lower busbar, due to the short connection daily work and maintenance legacy or other conductors caused by 690V bus, the occurrence of inter phase short circuit. If cabin cable when short circuit occurs, the box changes timely trip may avoid burnout accident. The units are arranged in the engine room of inverter power supply line, when on the cabin appear short circuit, the ignition phenomenon, and box transformer low-voltage side circuit breaker and can not be timely trip, will cause the occurrence of wind turbines burn out accident.