摘要
笔者针对近年来频发的铁磁谐振故障事件,分析了消谐失败的原因,提出了一种基于正温度特性材料的消谐器改进与设计方法:一是利用具有更大容量ZnO非线性电阻代替SiC电阻,制成一次消谐器常投于互感器PT一次侧中性点处,弥补了原有消谐器因无法快速消纳铁磁谐振的激发能量而造成互感器保险熔断或互感器炸裂事故,此外,ZnO非线性电阻在小电流时的低阻特性也降低了消谐器对PT的测量精度的影响;二是针对原有的二次消谐器因电阻调节速度不足而致使谐振能量无法及时消纳问题,用ZnO陶瓷电阻取代金属电阻,利用陶瓷电阻本身的物理特性再加上调控措施,能够在系统谐振时快速增大二次消谐电阻阻值,从而及时吸纳谐振能量而免于互感器过载。搭建试验平台对上述所涉及装置功能加以验证,结果表明了装置性能符合设计预期,在实际配电网运行结果表明了基于正温度特性材料ZnO的一、二次消谐器均能快速抑制铁磁谐振,避免了互感器及其他电气设备的损坏。
In view of the ferroresonance fault events in recent years,theauthor analyzes the reasons for the failure of harmonic elimination,and puts forward an improvement and design method of harmonic eliminator based on the material with positive temperature characteristics.First,the primary harmonic eliminator is made of ZnO non-linear resistance with larger capacity instead of Si C resistance,which is put into the neutral point of PT primary side for a long time,making up for the original harmonic eliminator’s inability to absorb ferroresonance quickly.In addition,the low resistance characteristic of ZnO nonlinear resistance at low current also reduces the influence of the detuning device on the measurement accuracy of PT.In view of the problem that the original secondary detuning device can not absorb the harmonic energy in time due to the insufficient speed of resistance adjustment,the ZnO ceramic resistance replaces the metal resistance.The physical characteristics of the system,together with the control measures,can rapidly increase the resistance value of the secondary harmonic elimination resistor when the system is resonant,so as to absorb the resonant energy in time and avoid the overload of the transformer.The test platform is built to verify the functions of the devices mentioned above,and the results demonstrate that the performance of the device meets the design expectations.The operational results of the actual distribution network show that the primary and secondary harmonic eliminators based on the positive temperature characteristic material ZnO can quickly inhibit the ferromagnetic resonance and avoid the damage of the transformer and other electrical equipment.
作者
朱咏明
马金财
赵普志
杜龙基
吴伟丽
刘俊
ZHU Yongming;MA Jincai;ZHAO Puzhi;DU Longji;WU Weili;LIU Jun(State Grid Xinjiang Electric Power Company Changji Power Supply Company,Changji 831100,China;State Grid Xinjiang Electric Power Company,Urumqi 830000,China;Xi'an University of Science and Technology,Xi’an 710000,China;Anhui Zheng Radio and Television Power Technology Co.,Ltd.,Hefei 230000,China)
出处
《电瓷避雷器》
CAS
北大核心
2021年第4期69-75,共7页
Insulators and Surge Arresters
基金
新疆电力公司科技项目(编号:XJKE20191203)。
关键词
主动免谐
谐振能量
铁磁谐振
正温度特性
initiative harmonic elimination
resonance energy
ferroresonance
positive temperature characteristic
作者简介
朱咏明(1976-),男,工程师,长期从事配电网运行与控制工作。Email:4860921@qq.com;通讯作者:吴伟丽(1978-),女,博士,副教授,长期从事大电网安全控制与灾变防治。Email:wwllxm@163.com。
