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Multifunctional steam turbine overspeed protection formwork capable of accurately measuring low revolution speed

A technology of precise measurement and overspeed protection, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as difficult after-sales maintenance, inaccurate templates, single functions, etc., to improve signal processing capabilities, improve integration, and enhance The effect of the function

Inactive Publication Date: 2009-05-27
DONGFANG TURBINE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the functions of common steam turbine overspeed protection templates are relatively simple, and some templates are not accurate in low-speed measurement, and low-speed measurement performance is one of the important indicators to measure its performance. It is an imported product, which is expensive and difficult to maintain after sales

Method used

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  • Multifunctional steam turbine overspeed protection formwork capable of accurately measuring low revolution speed
  • Multifunctional steam turbine overspeed protection formwork capable of accurately measuring low revolution speed
  • Multifunctional steam turbine overspeed protection formwork capable of accurately measuring low revolution speed

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a new multi-functional overspeed protection template for steam turbines that can accurately measure low speed, including a signal processing system and a power supply subsystem, is characterized in that: the signal processing system includes a speed signal conditioning module, a current signal conditioning module, and an ADC module , a DAC module, an MCU module, a CPLD module, a relay control module, and a digital display module; the speed signal conditioning module is provided with a magnetoresistive speed sensor and an eddy current speed sensor signal acquisition and processing circuit, and is connected with the ADC module; The DAC module and the relay control module are connected to the CPLD module; the CPLD module is connected to the MCU module through the SPI full-duplex synchronous communication interface; the current signal conditioning module is connected to the ADC module; the speed signal conditioning module and the ADC module are res...

Embodiment 2

[0045] A new type of multi-function steam turbine overspeed protection template that can accurately measure low speed. In order to realize the newly added function of judging power and load imbalance, the template is equipped with four current signal receiving and conditioning circuits for receiving and transmitting the three signals respectively. The 4-20mA current signal of the middle row pressure and one electric power, and each processing circuit adopts isolation processing, which ensures the independence of its work and improves the reliability. The collected current signal is sent to the MCU after ADC analog-to-digital conversion Make calculations to make judgments.

[0046] In order to improve the overall processing capability and response speed of the template, the template uses a high-performance and fast 16-bit single-chip microcomputer and a high-performance programmable logic array CPLD to form the control core. The port can simplify the template circuit, improve t...

Embodiment 3

[0053] Such as figure 2 As shown, the present invention adopts a set of circuit boards, which are integrated with an isolation amplifier conditioning circuit, a precision amplifier circuit, a rectifying wave circuit, a phase-locked loop circuit, an ADC analog-to-digital conversion circuit, a CPLD circuit, an MCU circuit, and a DAC digital circuit. Analog conversion circuit, relay control circuit, memory expansion circuit, PIC microcontroller and liquid crystal display circuit.

[0054] After the eddy current sensor signal is connected to the template, it needs to be rectified first to obtain a stable waveform that can be processed by other circuits. The specific circuit diagram is shown in Figure 3.

[0055] The template selects whether to process the eddy current sensor signal or the magnetoresistive sensor signal through the jumper J10, and then the signal is amplified by the instrument amplifier AD620, and then the amplified signal is processed by the op amp OP07 and the d...

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Abstract

The invention discloses a new and multi-functional overspeed protection form of the steam turbine which can measure the slow rotational speed precisely. It contains the signal processing system and the power subsystem. It is characterized in that: the signal processing system contains the conditioning modules of rate signal and current signal, ADC, DAC, MCU, CPLD, relay controlling and nixie displaying. The signal collecting and processing system of the magnetic resistant and electric eddy current speed sensors is set in the rate signal conditioning module and connected with the ADC module. The DAC module and the relay controlling module link the CPLD module. The CPLD module links the MCU module through the SPI full-duplex synchronous communication interface. The invention adopts the building block design to improve the form integrated level and anti-interference, which can improve the form performance indexes as avoiding the steam turbine happening the overspeed accidents, enhance the function, improve the integrated level and reduce the working cost.

Description

technical field [0001] The invention relates to the field of steam turbine security systems, in particular to a speed measurement and overspeed protection component in the steam turbine security system, and is a novel multifunctional steam turbine overspeed protection template capable of accurately measuring low rotational speeds. Background technique [0002] Steam turbine overspeed accident is the most destructive accident of steam turbine generator equipment, and the occurrence of overspeed accidents often produces devastating consequences. For this reason, all steam turbines are equipped with overspeed protection devices. After three phases of co-existing emergency breaking device and electrical over-speed protection device adopting DEH high-voltage anti-fuel technology and completely adopting electrical over-speed protection, the current steam turbine over-speed protection system basically adopts both electrical and mechanical over-speed protection. In the electrical ov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D21/02
Inventor 闵泽生曾光明游滔
Owner DONGFANG TURBINE CO LTD