This paper proves that the changes of pre-compression on the windings have effects on their natural frequencies and derives their relation, which provides the experimental and theories foundation for fault diagnosis of large-scale electric transformers.

• 通过对大型变压器绕组进行振动实验和根据建立的变压器绕组轴向振动数学模型的理论推导，阐明了变压器绕组预紧力的变化与其固有频率变化之间的关系，这为大型变压器的故障诊断提供了理论与实践依据。