A method of calibrating the accuracy Rogowski coil

A method of calibrating the accuracy and linearity of a Rogowski coil scale factor, including the following steps:

 Step 1: Calibrate the accuracy of the Rogowski coil scale factor:

 The first Rogowski coil and the standard current transformer to be calibrated are passed through the same power frequency high current I1, and the output voltage 112 of the first Rogowski coil is connected and connected to the secondary output of the standard current transformer. The output voltage m on the standard resistor, the proportional coefficient 仏 is known, and the primary current I1 is obtained according to I1=K1Xm; and according to I1 = K2XU2, the proportional coefficient 1 of the first Rogowski coil at a larger current can be obtained (2, according to the first Roche The product information of the coil and the proportional coefficient 1 (2 obtain the accuracy calibration result of the first Rogowski coil and draw the relationship curve of IdPu2, and obtain the relationship curve of IjPK2;

 Step 2: Calibrate the linearity of the Rogowski coil scale factor:

 Using the primary current conductor of the first Rogowski coil calibrated by the proportional coefficient at the current I1 in step I, passing through the primary loop of the second Rogowski coil to be calibrated linearity, then flowing the primary current through the second Rogowski coil It is equal to N times of the primary current flowing through the first Rogowski coil, S卩N.I1, and the output voltages of the two Rogowski coils are simultaneously collected, and the two output voltages are compared, and the second Rogowski coil under the current of N.I1 is obtained by calculation. The proportional coefficient, changing the different I1, can obtain the proportional coefficient of the second Rogowski coil under different currents, until the proportional coefficient under the maximum measured current of the second Rogowski coil, according to the product information of the second Rogowski coil and the proportional coefficient Kx Test the linearity calibration result of the Rogowski coil and plot the relationship between Ix and Ux, and obtain the relationship between the measured current Ix and the proportional coefficient Kx, and complete the linearity calibration of the Rogowski coil.

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