Abstract: In order to evaluate the wind turbine fire fighting capacity of the dry powder extinguishing device in extreme low temperature environment，2 m3 small space and 56 m3  large space fire extinguishing test device was established. In the -30 ℃ low temperature environment, the fire extinguishing test was carried out by means of the dry powder extinguishing device. The start-up performance, injection performance and fire extinguishing performance of the fire extinguisher was tested. The test results show that dry powder extinguishing device can start normally discharge under low temperature conditions. The fire extinguishing performance of super fine powder was not affected by low temperature. The super fine powder can put out class A and class B combustibles of the wind turbine. Low temperature has a significant effect on the diffusion characteristics of dry powder. If the fire fighting design uses the total flooding extinguishing way, the simulation fire suppression test should be carried out to verify the effectiveness.

Key words: wind turbine, super fine powder, low temperature condition, fire extinguishing performance, diffusion capacity