摘要
为降低变压器空载合闸过程中,产生幅值很大的励磁涌流,避免引起继保装置的误动作、电能质量下降、甚至系统瘫痪。根据变压器的工作原理,推导出了剩磁的计算公式,然后采用选相关合技术,在系统电压即将产生的预感应磁通与剩磁的大小和方向一致时投入变压器。选相关合技术是有效抑制电力系统操作过电压和涌流以及全面提高电能质量的关键技术。并通过ATP-EMTP建立仿真模型,验证了选相关合技术。结果表明:选相关合技术能够有效地削弱变压器空载投入时的励磁涌流。
In the process of reducing the high-amplitude excitation inrush current during the no-load loss in transformer close-brake, which may cause the wrong action of relay protective instrument, decrease of electricity quality, even the system breakdown. Based on the working theory of transformer, the formulate of residual magnetism was deduced, and then by adopting the related technology, while they have the same power and direction, they were put into use. Choosing the related technology is one of the key technologies to properly control the switching over voltage and to wholly improve the power quality. By ATP-EMTP to establish the simulation model,some related technologies are tested. The results showed that choosing the related technologies can effectively weaken the excitation inrush current in no-load transformer.
出处
《电力学报》
2010年第1期37-39,共3页
Journal of Electric Power
关键词
变压器
选相关合
励磁涌流
剩磁
ATP—EMTP
transformer
related technology
excitation inrush current
residual magnetism ATP-EMTP
