Measuring method for rotate speed of turbine

A measurement method and steam turbine technology, applied in the direction of using a device for measuring the time required to move a certain distance, can solve problems such as inaccurate measurement, jump changes, errors, etc., achieve accurate measurement of rotational speed, eliminate calculation errors, and ensure measurement response time Effect

Active Publication Date: 2011-04-06
GUODIAN NANJING AUTOMATION
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  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method: due to the unequal spacing between the teeth, the result of the measurement frequency jumps and changes.
Disadvantages of this method: due to the error of ±1 teeth in the number of teeth rotated within a certain period of time, the measurement is inaccurate at low speeds

Method used

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  • Measuring method for rotate speed of turbine
  • Measuring method for rotate speed of turbine

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Embodiment Construction

[0016] like figure 1 As shown in the system block diagram of the speed measurement module, the DPU (data processor) sets the number of steam turbine configuration teeth for the FPGA, and the rotation of the steam turbine gear generates a series of sine wave signals through the corresponding photoelectric pulse sensor and transmits them to the OPC module. The shaping circuit shapes the signal Become a square wave signal and transmit it to FPGA through high-speed optocoupler isolation. FPGA starts to fill and count the standard pulse output by the standard frequency at the first rising edge of the square wave, and stops counting after the number of rising edges of the configured tooth. Pass the filled pulse number to DPU, and calculate the steam turbine speed by DPU. This method is used to measure the speed of different steam turbines, especially the speed of the steam turbine with different spacing between the measurement gears. Since the speed of the steam turbine is calculate...

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Abstract

The invention discloses a measuring method for rotate speed of a turbine, which is characterized by comprising the following steps that (1) the number of configuration teeth of the turbine is set for an FPGA (Field Programmable Gate Array) through a DPU (Dispersion Processing Unit); (2) a gear of the turbine rotates to generate a series of positive rotation wave signals through a corresponding a photoelectric pulse sensor, and the signals are transmitted to an OPC (Optical Proximity Correction) module; (3) a shaping circuit shapes the signals into square wave signals and the square wave signals are transmitted to the FPGA after being isolated by a high-speed optical coupler; and (4) standard pulses output by a standard frequency are filled from the first square wave rising edge of the FPGA and are counted from the first square wave rising edge of the FPGA to a plurality of square wave ring edges of the configuration teeth, the number of the filled pulses is transmitted to the DPU, and the rotate speed of the turbine is worked out by the DPU. According to the measuring method provided by the invention, the time spent by the turbine to rotate a whole circle is measured according to the number of teeth of the turbine to work out the rotate speed of the turbine, and because the time spent by the turbine to rotate a circle but not the time spent among the teeth, the calculation error caused by the difference among the gaps of the teeth of the turbine is eliminated.

Description

technical field [0001] The invention relates to a method for measuring the speed of a steam turbine in a steam turbine digital electro-hydraulic regulating system (abbreviated as DEH), and is particularly suitable for overspeed protection modules of steam turbines and feedwater pump steam turbines in 600MW and below thermal power plants. Background technique [0002] The digital electro-hydraulic regulating system (DEH for short) of steam turbines and feedwater pump steam turbines in thermal power plants involves the measurement of steam turbine speed. Turbine Emergency Safety System (ETS) realizes shutdown protection by quickly closing the solenoid valve. [0003] At present, when the steam turbine digital electro-hydraulic control system realizes the measurement of the steam turbine speed, the pulse signal is generated by the photoelectric pulse sensor corresponding to the steam turbine gear rotation, and the current steam turbine speed is calculated after measuring the si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/64
Inventor 田海波吴胜华杨卫民
Owner GUODIAN NANJING AUTOMATION
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