System and method for linearly measuring position of control rod

Abstract

The invention discloses a system for linearly measuring position of a control rod. According to the system, two leading-out ends of a primary coil are connected with a power panel to receive exciting current output by the power panel; a digital conversion module and a filter and amplification unit are arranged on a signal conversion circuit board; the power panel is also connected with the digital conversion module to output a reference voltage to the digital conversion module; one end of the digital conversion module is connected with two leading-out ends of a secondary coil, and the other end of the digital conversion module is connected with a processor; the digital conversion module is used for converting induction voltage of the secondary coil into a digital signal and performing isolation transformation on the digital signal to obtain voltage to be output to the processor; one end of the filter and amplification unit is connected with the two leading-out ends of the primary coil, and the other end of the filter and amplification unit is connected with the processor; the filter and amplification unit is used for performing filter and amplification processing on the voltage of the primary coil and outputting the voltage to the processor; the processor is used for calculating a rod position of the control rod. Fewer lead wires are arranged in a detector, the failure rate is low, and the measurement accuracy of the rod position is high. The invention also discloses a method for linearly measuring position of the control rod.

Description

technical field [0001] The invention relates to the technical field of pressurized water reactor nuclear power plants, in particular to a linear measurement system and a measurement method for the position of a control rod of a pressurized water reactor nuclear power plant. Background technique [0002] In a pressurized water reactor nuclear power plant, the control rod assembly is in the high temperature and high pressure reactor pressure vessel, and the position of the control rod in the reactor core reflects the working condition of the reactor, so it is necessary to measure the position of the control rod; and the position of the control rod The measurement system is generally arranged outside the pressure vessel, and indirectly measures the position of the control rod by measuring the top position of the driving rod at the upper end of the control rod assembly through the principle of electromagnetic induction. [0003] At present, in PWR nuclear power plants, there are...

AI Technical Summary

Problems solved by technology

However, under actual working conditions, the temperature of the pressurized water reactor will rise from normal temperature to a high temperature of about 300°C. The change in temperature will change the magnetic permeability and resistivity of the drive rod and coil, thus affecting the relationship between the primary coil and the secondary coil. The coupling strength between them, which affects the induced voltage of the secondary coil, so the detector accuracy is still not high enough

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