Wiring method of MBS current transformer
的接线方式按其所接负载运行要求确定。 The wiring method of MBS current transformer is determined according to the operation requirements of the load connected to it. * Common wiring methods are single-phase, three-phase star and incomplete star.
Rated transformation ratio and error of the current transformer wiring mode: The rated transformation ratio of the current transformer KN refers to the rated current ratio of the current transformer. KN = I1N / I2N
When the MBS current transformer's primary current varies within a certain range, it is generally specified as 10 ~ 120% I1N, the secondary current should be proportionally changed, and the primary and secondary voltages (or currents) should be in phase. However, due to the internal impedance, excitation current, and loss of the transformer, errors in the ratio and phase occur, which are called ratio difference and angular difference, respectively.
The ratio difference is the ratio of the difference between the converted secondary current and the primary current magnitude to the latter, that is, fI is the ratio difference of the current transformer. When KNI2> I1, the ratio is positive, otherwise it is negative.
For current transformers without compensation measures, the ratio difference is negative and the angle difference is positive. Both the good value of the ratio difference and the angle difference decrease with increasing current.
The compensation method can reduce the error of the transformer. Generally, it is compensated by winding an additional winding or adding an additional core on the transformer, and inserting the corresponding resistance, inductance, and capacitance elements. Commonly used compensation methods include turn compensation, fractional turn compensation, small core compensation, and parallel capacitor compensation.
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