油浸式变压器铁心振动特性分析

Analysis of Vibration Characteristics for Oil-immersed Transformer Core

振动信号是反映变压器状态的有效信息,分析变压器铁心振动特性有利于铁心的状态诊断。通过搭建的变压器振动测试平台,测试了不同空载电压、不同铁心材料、不同铁心状态、不同变压器容量以及不同方向下的铁心振动信号。结合铁心振动产生机理,对比分析各条件下振动信号的幅值和频谱分布变化规律。分析结果表明,铁心振动信号主要由100 Hz基频及其倍频组成,不同条件下振动信号的幅值和频谱分布规律呈现不同的特性。对铁心在不同条件下的振动特性分析,对基于振动信号的变压器状态评估具有重要意义。

As effective information,vibration signals can reflect the transformer state,and the analysis of the transformer core vibration characteristics is conductive to the diagnosis of core states.Based on a transformer core vibration test platform constructed in this paper,the core vibration signals were tested under different conditions,such as different no-load voltages,core materials,core conditions,transformer capacities,as well as different directions.Combined with the generation mechanism of core vibrations,the changing characteristics of amplitude and frequency-spectrum distribution of vibration signals under different conditions were compared and analyzed.The analysis result indicated that the transformer core vibration signal was mainly composed of 100 Hz fundamental frequency and its frequency doublings,and the transformer core presented different vibration characteristics under different conditions.The analysis of core vibration characteristics under different conditions is significant for the evaluation on transformer states based on vibration signals.