Patent ID: 8212535

Claim:
A method for compensating a phase error between a primary current and a secondary current of a toroidal core current transformer, particularly for medium high-voltage and high-voltage systems, wherein the toroidal core current transformer comprises a primary conductor that traverses the toroidal core, as well as a secondary winding that is wound around the toroidal core and one of a measuring shunt or a burden that is provided on a secondary side, the method comprising the steps of: calculating a capacitance of a passive compensation circuit necessary to compensate for the phase error in accordance with the equation C =  tan ⁢ ⁢ φ  ω · R Sh ⁢ ⁢ or ⁢ ⁢ C =  tan ⁢ ⁢ φ  ω ·  Z _ b  , respectively, wherein C represents the capacitance of the passive compensation circuit, ω represents a radian frequency, φ represents the phase error between the primary and the secondary current, R sh represents the resistance of the measuring shunt and Z b represents the impedance of the burden, and providing the passive compensation circuit, having the calculated capacitance, on the secondary side in order to compensate for the phase error.