摘要
本文通过对35 k V电容式电压互感器(CVT)高压侧熔断器熔断时刻故障录波数据的分析,发现高压熔断器熔断的主要原因不是铁磁谐振产生的过电压。利用Matlab/Simulink仿真平台,建立了35 k V母线CVT仿真模型,对并联电容器组投入时刻CVT一次侧的暂态电压和电流进行了仿真分析。得出结论:电容器组投入时CVT一次侧流过的暂态高频电流是导致熔断器频繁熔断的主要原因,且该电流大小与合闸时刻电压的相位角有关。最后根据工程实践,给出了增大熔断器额定电流或取消熔断器保护的建议。
In this paper,through the analysis of the fault record data at the fusing moment in 35 kV CVT HV side,the main reason of fuse of HV fuse has been found that it is not due to the ferroresonance overvoltage. CVT simulation model of 35 kV busbar is set up by way of Matlab/Simulation platform and the transient voltage and current of the primary side of CVT at the switching of capacitor bank is simulated and analyzed. It is concluded that the main reason of frequent fuse of fuse is due to the transient high frequency current passing through the primary side of CVT in the switching of capacitor bank ,and the current magnitude is related to the phase angle of voltage at the moment of closing operation. Finally, such suggestion as increase of rated current of fuse or elimination of fuse pro- tection is given in accordance with the engineering practice.
出处
《电力电容器与无功补偿》
北大核心
2016年第4期58-61,共4页
Power Capacitor & Reactive Power Compensation
