Rod position measuring device and method

Abstract

The invention relates to the technical field of measuring a control rod of a reactor, in particular to a rod position measuring device and a rod position measuring method. The method comprises a control rod assembly, a loop-chain mechanism, a worm gear and worm speed reducer, a first rotating transformer, a second rotating transformer and a double-channel resolver-to-digital conversion module, wherein the loop-chain mechanism is connected with the control rod assembly; the worm gear and worm speed reducer is connected with the loop-chain mechanism; the first rotating transformer is arranged at the worm shaft end of the worm gear and worm speed reducer; the second rotating transformer is arranged at the worm gear shaft end of the worm gear and worm speed reducer; and the double-channel resolver-to-digital conversion module is connected with the first rotating transformer and the second rotating transformer respectively. By the device and the method, the rod position measuring precisionis improved, the zero-crossing error generated in the signal coupling process is eliminated, the adaptability of the measuring device to an environment is ensured, and the utilization ratio of a power station and the running reliability of the device are improved.

Description

technical field [0001] The invention relates to the technical field of measuring reactor control rods, in particular to a long-stroke and high-precision rod position measuring device for commercial high-temperature gas-cooled reactors. Background technique [0002] The control rod drive mechanism is the executive mechanism of the reactor control and safety protection system. When the reactor is in normal operation, the control rod driving mechanism drags the control rod to move in the reactor at a certain speed, compensates and adjusts the backup reactivity of the core, and realizes the normal start-up, operation and shutdown of the reactor. In the event of a reactor accident, the drive mechanism drives or releases the control rods so that they can be quickly inserted into the core to realize emergency shutdown. In order to achieve the above functions and ensure the effective control of the reactor, it is generally required that the control rod drive mechanism responds quic...

AI Technical Summary

Problems solved by technology

If the rod position measurement method of the modular high-temperature gas-cooled experimental reactor is copied to the commercial high-temperature gas-cooled reactor, the following problems will be encountered: ① Because the reducer amplifies the measurement error once, the rod position measurement error is too large to meet the requirements of the reactor control system. ②The processing accuracy of the worm gear reducer is too high, the processing procedure is complicated, and it is difficult to realize; ③The structure of the integrated angular position measurement sensor is easily damaged when the rod is dropped in an accident, which is not conducive to the reliable operation of the device sex

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