基于麦克斯韦电桥的互感器负荷箱测试仪的设计

在互感器负荷箱的日常检测工作中发现,其误差往往出现不稳定的现象,这主要与校准装置的工作原理有关.目前互感器负荷箱校准装置的测量原理为“阻抗检测法”或“导纳检测法”,测量结果受电网质量(高次谐波,频率等因素)影响较大,这直接影响着检测结果的可靠性.本文采用麦克斯韦电桥原理,提出独立检测互感器负荷箱内部元件(电阻、电感)的...

A Design of Load-box Calibration Device by Maxwell Bridge

In routine testing of load-box,the error often appears instability which related to the principle of detection.At present,the measuring principle of load-box is "Impedance detection" or "Admittance test" which is greatly affected by the quality of power grid(such as upper harmonics,frequency and other factors).As this point,the error of load-box often appears in unstable phenomenon especially in low impedance.Therefore,this paper designs a device to calibration load-box that based on the theory of Maxwell Bridge,and provides a method by detecting the components(such as resistance and inductance) in the load-box which can not only avoid the effect that comes from the grid,but also can offer a basis for developing more accurate device of load-box calibration.Moreover,a comparative experiment has been made between this device and the tradition one,and it proved that the independent component measuring idea has obvious advantages at stability aspect.