基于同一化原理和串联附加电感的绕组参数测量方法

A New Method for Dynamic Measurement of Windings Parameters Based on Identity Principle and Serial Additional Inductance

提出了一种快速测量发电机、电力变压器等电力设备绕组参数的方法,能够对绕组的直流电阻和电感同时进行测量。测量回路由直流电源、外接大电阻、附加电感和被测绕组串联组成。测量前对测量回路按同一化原理进行调整,使测量回路的时间常数是定值并使绕组的稳态电流值相同,可使不同的测量绕组具有相同的测量精度;同一化后采用动态法进行测量,可避免电流微小变化产生的直流电阻的测量误差;附加电感的引入,使得在绕组电感的动态测量过程中,无需求解电流导数值,消除了由于采用离散采样的数值微分法近似求解带来的误差。

A new method for fast measuring the inductive winding parameters of electrical equipments such as electric transformers, generators etc is proposed. The measuring circuit is composed of several serial connected devices such as： a dc power supply, an external large resistance, an additional inductance and the measured windings. Before measuring, the measuring circuit is adjusted based on the ＇identity＇ principle to make time constants fixed values and steady state currents of the measuring circuit of different apparatuses identical, so that the same measuring accuracy for different measured windings can be obtained. Then the winding is measured by dynamic method, which can avoid measuring error of direct current resistance caused by little change in the current. The introduction of additional inductance makes it unnecessary to solve derivative value of the current, thereby, the error caused by solving numerical differentiation of discrete sampling can be eliminated.