【作者】 沈洲鹏； 蔡飞鸿； 张金龙； 吴伟将； 许高俊； 张海龙；

【Author】 SHEN Zhou-peng;CAI Fei-hong;ZHANG Jin-long;WU Wei-jiang;XU Gao-jun;ZHANG Hai-long;Nanjing Normal University School of Electrical and Automation Engineering, Nanjing Normal University;Marketing Service Center, State Grid Jiangsu Electric Power Co., Ltd;

【机构】 南京师范大学电气与自动化工程学院； 国网江苏省电力有限公司营销服务中心；

【摘要】 电力变压器运行时固有的振动特性在电网中出现电能质量问题时会变得异常甚至加剧,从而通过机电耦合又引起新的电能质量问题,危害系统安全稳定运行。为揭示电网电能质量问题对电力变压器振动特性的影响机理,本文以10kV配电变压器为例,在三相不平衡、谐波和电压波动三种典型电能质量问题下,理论推导变压器本体在正常工况下的振动加速度,得出电源电压幅值和电流谐波对铁心和绕组振动加速度的影响关系,进一步建立配电变压器有限元模型,在电磁场和结构场下验证三种情况下的振动问题,揭示了电能质量问题对变压器本体振动的影响机理,为变压器结构设计和减振降噪处理提供理论依据。更多还原

【Abstract】 The inherent vibration characteristics of power transformers during operation will become abnormal or even aggravated, when power quality problems occur in the power grid.Meanwhile, it will bring back new power quality problems through electromechanical coupling,thus endangering the safe of the system. In order to reveal the influence mechanism of power grid power quality problems on the vibration characteristics of power transformer, a 10kV distribution transformer is researched, under three typical power quality problems of three-phase unbalance,harmonic and voltage fluctuation. The vibration acceleration of transformer body under normal working conditions is deduced theoretically, then the influence relationship between power supply voltage amplitude and current harmonic on the vibration acceleration of core and winding is obtained. Further, the finite element model of distribution transformer is established. The vibration problems under three conditions are verified in the electromagnetic field and the structural field.The influence mechanism of the power quality problem on the vibration of the transformer body is revealed, which provides a theoretical basis for the structural design and vibration and noise reduction of the transformer.更多还原