| 摘要 |
The present invention relates to a current transformer system having a current transformer, which detects a current flowing through the current transformer and converts said current into a measurement voltage, and evaluation electronics which, on the basis of the measurement voltage, determine at least one of the characteristic variables from the group G consisting of I, In, Ist, Imin, ITR, IMAX, U, Un, f, fn, PF, where I = electrical current flowing through the current transformer; In = stated reference current intensity for which the current transformer has been designed; Ist = lowest stated value of I at which the current transformer measures electrical active energy with a power factor of one; Imin = value of I above which the deviation is within the error limits; ITR = value of I above which the deviation is within the lowest error limits corresponding to the accuracy class stated for the current transformer system; IMAX = maximum value of I at which the deviation is within the error limits; U = electrical voltage applied to the current transformer; Un = stated reference voltage; f = frequency of the voltage applied to the current transformer; fn = stated reference frequency; PF = power factor = cos&phgr; = cosine of the phase shift &phgr; between I and U. |
