A disconnection detection method and system for a steam turbine speed measurement sensor signal
A sensor signal and disconnection detection technology, which is applied in the testing/calibration of speed/acceleration/shock measurement equipment, devices using electric/magnetic methods, speed/acceleration/shock measurement, etc., can solve the problem that the measurement channel does not support multiple Various types of sensor disconnection detection and other problems, to achieve the effect of fast detection speed and easy operation
Active Publication Date: 2022-01-25
XIAN THERMAL POWER RES INST CO LTD +2
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[0004] The purpose of the present invention is to solve the problem that the measurement channel of the speed card in the above-mentioned prior art does not support the disconnection detection of various types of sensors, and to provide a method and system for detecting the disconnection of the sensor signal of the steam turbine speed measurement, which can provide comprehensive active And the detection of the signal of the passive type speed measuring probe, and the detection speed is fast and the operation method is simple
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] see figure 1, the present invention proposes a disconnection detection system for the steam turbine speed measurement sensor signal, including a speed sampling circuit, a disconnection detection circuit and a microcontroller, the speed signal is input into the speed sampling circuit, and the obtained unit speed is sent to the described microcontroller, the microcontroller sends a disconnection detection excitation signal to the disconnection detection circuit, and the disconnection detection circuit detects the power disconnection signal and the speed disconnection signal and reads it back to the micro controller.
[0028] see figure 2 In the figure, U1 is the domestic optocoupler relay HSSR-DA05-2, and U2 is the domestic optocoupler chip TD354. DXJC_KG1 is the abbreviation of the first disconnection detection switch signal. Similar...
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A method and system for detecting disconnection of a steam turbine speed measurement sensor signal. The detection method includes determining an object for disconnection detection according to the sensor type. If the sensor is a magnetoresistive sensor, only the disconnection state of the signal line is judged, and the read speed signal is judged. Whether it is zero, if the speed signal is zero, then judge whether the speed input exceeds the set time and there is no pulse continuously, if there is no pulse signal read beyond the set time, then it is judged that the signal line is broken. If the speed signal is not zero, calculate the speed frequency and judge whether it is not less than the threshold, if the speed frequency is not less than the threshold, execute the first data refresh cycle, and execute the second data refresh cycle when the speed frequency is less than the threshold, and then judge whether the speed input exceeds The set time is continuous without pulse. If it is a magnetoelectric or eddy current sensor, it will judge the disconnection of the signal line and the disconnection of the power line at the same time. The present invention can quickly provide comprehensive detection.
Description
technical field [0001] The invention belongs to the field of speed measurement of steam turbine generator sets, and in particular relates to a method and system for detecting a disconnection of a speed measurement sensor signal of a steam turbine. Background technique [0002] The digital electric industry control system (Digital Electric Hydraulic Control System, DEH) generally adopts the system based on DCS at present. DCS is the English abbreviation of Distributed Control System (Distributed Control System), also known as Distributed Control System, which is a new type of computer control system relative to centralized control system. [0003] The steam turbine digital electro-hydraulic control system (DEH) is an important part of the steam turbine generator set in a thermal power plant. It controls the speed, load, pressure, etc. . In a thermal power plant, the rotor speed of the steam turbine is an important operating parameter. The speed of the steam turbine changes ...
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IPC IPC(8): G01P21/02G01P3/44G01P3/49G01R31/54F01D21/00
CPCG01P21/02G01P3/44G01P3/49G01R31/54F01D21/003
Inventor 李卓樊启祥李辉王宾于在松王珩程国栋管磊冯震震
Owner XIAN THERMAL POWER RES INST CO LTD