基于晶界工程技术提升变压器绕组抗油硫腐蚀性能的研究

Enhancement of Resistance to Sulfur Corrosion for Transformer Copper Windings via Grain Boundary Engineering Technology

基于晶界工程(GBE)技术,通过对铜绕组进行加工(冷轧)及热处理(退火)参数优化,调控铜绕组微观组织结构,提升其抗油硫腐蚀性能,并研究其对绝缘油性能的影响。结果表明:经优化处理后的绕组,其抗腐蚀性能明显提升。腐蚀实验后,铜绕组表面无明显的腐蚀痕迹,绝缘油中Cu含量由原先的3660μg/kg降低至2.47μg/kg,同时腐蚀后绝缘油电气性能均有提升。

Faults for transformer occurred often due to the insulation degradation within the transformer, which is always related with the sulfur induced corrosion of copper winding. Therefore, it is meaningful to enhance the corrosion resistance of the transformer Cu-winding via the so called grain boundary engineering (GBE) technology, namely the microstructure of copper winding was adjusted by appropriately cold rolling and annealing of copper winding, therewith its corrosion resistance was improved. Results show that after such treatment the corrosion resistance of winding may be improved significantly. According to the result of comparative corrosion testing in a insulating oil for Cu-widings before and after GBE treatment respectively, it follows that the residual Cu-content in the insulating oil decreases significantly from 3660 μg/kg for the original winding to 2.47 μg/kg for the GBE treated Cu-winding, thus the quality of insulating oil, as far as taking its physical-, chemical- and electrical-properties into consideration, is far much better for the case in the presence of the GBE treated Cu-winding.