Signal processing method and device for scratch measurement of steam turbine rotor in nuclear power plant

Abstract

The invention relates to the technical field of steam turbine auxiliary systems in nuclear power plants, in particular to a method and device for processing signals for measuring scratches of steam turbine rotors in nuclear power plants. The measurement signal is collected by a scratch detector; the method includes: sampling the original measurement signal collected by the scratch detector in real time; judging whether the voltage of the original measurement signal meets a preset output standard; if not If the preset output standard is met, it is determined that the original measurement signal is a spike signal; the subsequent output of the spike signal is restricted until the voltage of the spike signal meets the preset output standard; wherein, during the period of limiting the spike signal output, The peak signal is controlled to be output according to the sampling point voltage before limitation. This application identifies and eliminates the peak signal by adopting the method of first judgment and then limitation, and at the same time controls the peak signal to be output according to the sampling point voltage before the limitation during the limitation period, so as to ensure that the measurement signal obtained by the measurement card is more authentic and reliable.

Description

technical field [0001] The invention relates to the technical field of steam turbine auxiliary systems in nuclear power plants, in particular to a method and device for processing signals for measuring scratches of steam turbine rotors in nuclear power plants. Background technique [0002] A steam turbine is an external combustion rotary machine that converts steam heat energy into mechanical energy. Usually, after the steam from the boiler enters the steam turbine, it passes through a series of annular nozzles and moving blades in sequence, converting the thermal energy of the steam into the mechanical energy of the rotation of the steam turbine rotor. [0003] In a nuclear power plant, the steam turbine is used as a nuclear power device, which mainly receives the thermal energy generated by nuclear fission, and then converts the thermal energy into mechanical energy, and the mechanical energy acts on the generator to generate electrical energy through the generator, so as ...

AI Technical Summary

Problems solved by technology

Traditionally, in order to ensure the normal operation of the steam turbine, multiple test points are set on the rotor of the steam turbine to dynamically track the working state of the rotor; As a result, there is a spike in the raw measurement signal detected by the scratch detector during cranking, swiveling and power operation, which occurs once per rotation cycle

Since the peak signal is the same as the rotor rotation frequency, the peak signal cannot be eliminated by using a conventional filter, so that it cannot provide true signal measurement and feedback for the operation of the unit

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