1、Lessons Learned Entry: 0235Lesson Info:a71 Lesson Number: 0235a71 Lesson Date: 1993-07-02a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Wind Turbine Generator Description of Driving Event: A wind turbine was lowered from its tower and secured to a ground level assembly stand. A
2、 blade tip was then removed and the work crew broke for lunch. After lunch the rotor brake was released. Personnel on the ground realized the unbalanced rotor condition as the blade came rapidly to the ground.The direct cause of the accident was a failure of several knowledgeable personnel in the im
3、mediate area to realize the unbalanced conditions of the rotor. A crane operator was available in the immediate area. The crane should have been used to secure the unbalanced rotor and slowly lower it to the ground. This procedure of lowering an unbalanced rotor has been standard procedure in many b
4、lade, spool piece, and tip changes in the past.Lesson(s) Learned: When servicing wind turbines with unbalanced blades, releasing the rotor brake allows the heavy end to fall, causing blade damage and injury to personnel.Recommendation(s): Secure unbalanced blades with appropriate crane supported sli
5、ngs or tied- off lines before releasing the rotor brake.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Industri
6、al Operationsa71 Lifting DevicesAdditional Info: Approval Info: a71 Approval Date: 1994-04-19a71 Approval Name: Maria Havenhilla71 Approval Organization: LERC/EBASa71 Approval Phone Number: 216-977-1483Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
