A Rod Position Measuring Device with Double Helical Coil Cascade Structure

Abstract

The invention relates to a rod position measuring device with a double-spiral coil cascade structure, which belongs to the technical field of rod position measurement and control of reactors, and is characterized by comprising a series of measuring double-spiral coils for rod position measurement, a reference double-spiral coil, a measuring mandrel formed by staggered arrangement of a magnetic conductive material section and a non-magnetic conductive material selection and coaxially connected with a driving shaft of a control rod, a reference mandrel with the same natures, material and structure with the non-magnetic conductive material section in the measuring mandrel, a field wiring terminal block box, an excitation signal generating unit, a signal conditioning unit and an information processing unit, wherein an industrial computer in the information processing unit determines the state of each measuring double-spiral coil by judging the signal voltage difference between each measuring double-spiral coil and the reference double-spiral coil under the action of the same excitation signal, combines and obtains the corresponding position information of the rod position. The rod position measuring device has the advantages of high reliability, high signal-to-noise ratio and on-line fault diagnosis of the coils.

Description

technical field [0001] The invention belongs to the technical field of reactor rod position measurement and control, and relates to a reactor rod position measurement device, in particular to a rod position measurement device with a double helical coil cascade structure. Background technique [0002] Control rods and their driving mechanisms are important components to ensure the safe operation of the reactor. Under normal working conditions, by adjusting the position of the control rods, the normal start-up and shutdown of the reactor can be realized, and the reactor can be maintained at a given power level and the power can be adjusted; under accident conditions, by quickly inserting the control rods Reactor core to achieve emergency shutdown. The rod position measurement device is one of the most important devices in this component, and its reliability and safety are directly related to the normal operation and safety of the entire reactor. [0003] At present, the exis...

AI Technical Summary

Problems solved by technology

However, the design still has the following deficiencies: 1. Each self-inductance measurement coil generates an amplified excitation signal by an independent corresponding auxiliary signal circuit. Due to physical phenomena such as temperature drift in the long-term operation of multiple amplifying circuits, each self-inductance measurement There is relative parameter drift in the long-term operation of the coil signal

2. There are parameter differences between multiple amplifying circuits, and it is difficult to debug the consistency between the circuits in use and maintenance

3. In the event of a single coil failure, only the location of the failure can be identified, but the working characteristics of the rod position measuring device cannot be guaranteed

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