Case Study and Improving Suggestions for Core Bending and Deformation of Main Transformer in Lingao Nuclear Power Station
Han Qing-hao · Electrical Equipment · 2006
The serious events of core bending and deformation of several transformers in Lingao Nuclear Power Station happened in less than 3 years under the normal operating conditions. The tie tapes of all transformer cores were made to pull tightly again during the overhaul of generator unit, and the two transformers with core bending seriously were returned to the manufactory to retrofit and maintain. To prevent the events of core bending and deformation of main transformer, the possible reasons for core bending and deformation of transformer were analyzed and discussed. It is pointed out that the existent defects, such as structural design of transformer core clip and assembly technology of tie tape, are the prime cause of core bending and deformation of transformer.