This paper Introduces the performance automated testing system of transformer cooling fan.The system supports WinXP operating system,in line with the latest national standards GB/T1236-2000.It uses Lab windows/CVI virtual instrument development tools,automatic data collection,calculation,as well as the fans running condition of the automatic control points.It also can achieve the performance chart automatic drawing,utomatic generation of test reports and other functions.It can greatly increase the efficienc...