The built-in capacitance control rod position sensor can be applied to the control rod hydraulic drive system(CRHDS).Aiming at the four-helix electrode capacitance control rod position sensor,the static characteristics of control rod position measurement by the method of double capacitance values are studied in this paper.Through the principle experiment of the sensor,the calculation model of the sensor is established,and the numerical simulation results are verified by experiments.Assuming that the measured rod is eccentric as a whole,the functional relationship between two groups of capacitance values and rod position of control rod is established by numerical simulation method.The error analysis of the function is conducted,and the applicability of the function to different deflection directions and tilt states of the measured rod is analyzed.The results show that according to the rod position measurement method of double capacitance values,the maximum measuring error of rod positions can be limited within±6 mm.The sensitivity of the sensor can be improved to the order of 0.05 pF/mm,which can meet the actual requirements of control rod position measurement.
Control rod hydraulic drive systemControl rod positionCapacitance sensor
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