Toroidal Core Current Transformer with Phase Compensation Circuit

摘要

Disclosed is a toroidal core current transformer comprising a primary conductor which penetrates the toroidal core and a secondary winding that is wound around the toroidal core. A measuring shunt (R_Sh) or a load (Z_b) is provided at the secondary end. In order to compensate the phase error (f) between the primary current (I_P) and the secondary current (I_s), a compensation circuit (K) whose capacity (C) is measured substantially according to equation (I) or (II) is provided at the secondary end. In equation (I) or (II), C represents the capacity of the compensation circuit, ω represents the radian frequency, φ represents the phase error between the primary current and the secondary current, R_sh represents the resistance of an optional measuring shunt, and Z_b represents the impedance of an optional load.; $$ \begin{array}{cc}C=\frac{\tan \phi }{\omega ·R_{\mathrm{sh}}}& \left(I\right)\\ C=\frac{\tan \varphi }{\omega ·\underset{\_}{Z}}& \left(\mathrm{II}\right)\end{array}$$