交直流混杂环境下Y/Δ变压器铁芯振动研究

Research on Core Vibration of Y/Δ Transformer Under AC/DC Hybrid Environment

针对三相Y/Δ变压器遭受直流扰动时的励磁饱和与铁芯振动问题,提出了一种励磁-振动谐响应分析方法。建立直流入侵状态方程,通过电磁耦合迭代辨识励磁电流,以表征直流偏磁下变压器的饱和程度,同时建立振动谐响应模型分析铁芯振动。仿真计算变压器在交直流混杂环境下的电磁特性,研究不同直流水平下励磁电流的变化情况及铁芯振动特性,同时将三相组式变压器与三相三柱式变压器在直流扰动下的励磁-振动特性进行对比并总结规律。搭建Y/Δ变压器动模实验平台,利用励磁电流辨识模块监测电流波形,利用振动监测模块采集振动信号,通过实验数据验证仿真结果的正确性。

In this paper,an excitation-vibration harmonic response analysis method is proposed to solve the problem of excitation saturation and core vibration of Y/Δtransformer disturbed by DC.Moreover,a DC invasion state equation is established,and the excitation current is identified through electromagnetic coupling to characterize the saturation degree of DC biased transformer.Meanwhile,a vibration harmonic response model is established to analyze the core vibration.Electromagnetic characteristics of transformer in AC/DC hybrid environment are simulated and calculated.The variation of excitation current and core vibration characteristics at different DC levels are studied.The excitation-vibration characteristics of a three-phase group transformer and a three-phase three-limb transformer are compared,and the law is summarized.An experimental platform of Y/Δtransformer is built,the excitation current is monitored by an excitation current identification module,and the vibration signal is collected through a vibration monitoring module.The correctness of the simulation results is verified by the experimental data.