CN101082288A - Multifunctional steam turbine overspeed protection forwork capable of accurate measuring low revolution speed - Google Patents
Multifunctional steam turbine overspeed protection forwork capable of accurate measuring low revolution speed Download PDFInfo
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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
The present invention relates to steam turbine security system field, refer to testing the speed and Over speed Protection Unit in the steam turbine security system especially, a kind of Multifunction can accurately be measured slow-revving turbine over template.
Background technique
Steam turbine hypervelocity accident is the accident of Turbo-generator Set damage of facilities maximum; the hypervelocity accident tend to produce destructive consequence; all for this reason steam turbine all are provided with overspeed governor switch; after having experienced traditional mechanical formula emergency trip device, mechanical type emergency trip device and having adopted the electric overspeed governor switch of DEH high pressure fireresistant oil technology and deposit and adopt electric overspeed protection three phases fully, present turbine over system substantially all adopts electric with the mechanical overspeed protection control protection and deposit.In electric overspeed governor switch, the turbine over template is exactly the core component of control.
At present common turbine over template function is all more single; and the template that has is inaccurate when low speed is measured; and the test of low rotating speed performance is one of important indicator of weighing its performance; simultaneously owing to mostly present turbine over template on the market is external imported product; cost an arm and a leg the after-sales service difficulty.
Summary of the invention
The objective of the invention is to compare with similar turbine over template guaranteeing, can reliably realize preventing improving under the prerequisite of steam turbine generation hypervelocity accident the performance index of template, strengthen function, the raising level of integration reduces cost simultaneously.
Technological scheme of the present invention is as follows:
A kind of Multifunction can accurately be measured slow-revving turbine over template, comprise signal processing system and power subsystem, it is characterized in that: described signal processing system comprises rate signal conditioning module, current signal conditioning module, ADC module, DAC module, MCU module, CPLD module, relay control module, digital display modular; Be provided with magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit in the described rate signal conditioning module, and be connected with the ADC module; Described DAC module, relay control module are connected with the CPLD module; Described CPLD module is connected by full duplex synchronous communication interface SPI with the MCU module.
Described ADC module is an analog-to-digital conversion module, and the DAC module is a D/A converter module, and the MCU module is a single-chip microcomputer, and the CPLD module is the programmed logic control module.
Described digital display modular links to each other by asynchronous serial communication interface UART with the MCU module.
Described MCU module comprises the MCU hardware module of transmission signal and the MCU software module of processing signals; Described rate signal conditioning module comprises that frequency signal puts in order wave circuit, accurate amplification circuit, phase-locked loop circuit, and described phase-locked loop circuit is connected with electric convolution speed sensor signal collecting treatment circuit with the magnetoresistive type velocity transducer.
A kind of Multifunction can accurately be measured slow-revving turbine over template, the step that it is characterized in that the processing signals flow process is: the magnetoresistive type velocity transducer of described rate signal conditioning module setting and electric convolution speed sensor signal collecting treatment circuit are simultaneously sent into ADC module and phase-locked loop circuit through whole ripple, amplification after handling with the rate signal that collects, directly send into the ADC module through the current signal that the current signal conditioning module was nursed one's health, again the signal after ADC module and phase-locked loop circuit processing is sent into the CPLD module; Described CPLD module transfers signals to DAC module and relay control module again; Described CPLD module also is transferred to the MCU hardware module by SPI full duplex synchronous communication interface with signal, and is calculated and judged rate signal and the current signal that collects through the CPLD module by the MCU software module; Described MCU software module is transferred to digital display modular to the tachometer value and the alarm signal that calculate by communication interface, finishes the number demonstration of rotating speed and the indication of template status lamp by digital display modular.
The unit of the tachometer value that described MCU software module calculates is: rev/min, rpm.
Totally four of described current signal conditioning module, each module all adopt to isolate to amplify and handle.
The sample frequency of described CPLD module controls ADC module.
Totally 4 relays in the described relay control module are respectively applied for that hypervelocity 103%, 110%, 114%, acceleration transfinite, power, load unbalanced judgement output.
Comprise EEROM, SRAM circuit in the described MCU hardware module, growth data space when the EEROM circuit is used for the calculating of MCU software module, the SRAM circuit is used for the static essential running parameter of preserving.
Described magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit are selected configuration by wire jumper.
Described template is the power supply of two-way 24VDC power supply, and power subsystem is made up of two DC-DC general power conversion modules and six isolation DC-DC power modules.
Beneficial effect of the present invention is as follows:
What the whole template of the present invention adopted is modular design, form integrated level and anti-interference have been improved, can reliably realize preventing improving under the prerequisite of steam turbine generation hypervelocity accident the performance index of template, strengthen function, improve level of integration, also can reduce production costs simultaneously; Guarantee the demand of external variety classes velocity transducer, improved the signal handling capacity of template; Template adopts the power supply of two-way 24VDC power supply, any one road power failure, do not influence the template proper functioning, power subsystem is made up of two DC-DC general power conversion modules and six isolation DC-DC power modules, guarantee the work independence between current signal conditioning module, DAC module, relay control module and template simulation, the digital channel, improved the job security of template.
Description of drawings
Fig. 1 is the structured flowchart of turbine over template of the present invention
Fig. 2 is the hardware structure diagram of turbine over template of the present invention
Fig. 3 handles physical circuit figure for eddy velocity sensor signal of the present invention
Fig. 4 handles physical circuit figure for the whole ripple of tach signal of the present invention amplifies
Fig. 5 is the phase-locked processing physical circuit of phaselocked loop frequency division of the present invention figure
Fig. 6 gathers isolation processing physical circuit figure for current signal of the present invention
Fig. 7 is AD conversion treatment physical circuit figure of the present invention
Fig. 8 is that MUC of the present invention, CPLD, expansion EEROM and expansion SRAM connect physical circuit figure
Fig. 9 is DA conversion treatment physical circuit figure of the present invention
Figure 10 drives physical circuit figure for relay of the present invention
Figure 11 is the LCD of the present invention and the indication physical circuit figure that reports to the police
Figure 12 is software filtering algorithm principle figure of the present invention
Embodiment
As shown in Figure 1, a kind of Multifunction can accurately be measured slow-revving turbine over template, comprise signal processing system and power subsystem, it is characterized in that: described signal processing system comprises rate signal conditioning module, current signal conditioning module, ADC module, DAC module, MCU module, CPLD module, relay control module, digital display modular; Be provided with magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit in the described rate signal conditioning module, and be connected with the ADC module; Described DAC module, relay control module are connected with the CPLD module; Described CPLD module is connected by SPI full duplex synchronous communication interface with the MCU module.
Described digital display modular links to each other by the UART asynchronous serial communication interface with the MCU module.
Described MCU module comprises the MCU hardware module of transmission signal and the MCU software module of processing signals; Described rate signal conditioning module comprises that frequency signal puts in order wave circuit, accurate amplification circuit, phase-locked loop circuit, and described phase-locked loop circuit is connected with electric convolution speed sensor signal collecting treatment circuit with the magnetoresistive type velocity transducer.
A kind of Multifunction can accurately be measured slow-revving turbine over template, the step that it is characterized in that the processing signals flow process is: the magnetoresistive type velocity transducer of described rate signal conditioning module setting and electric convolution speed sensor signal collecting treatment circuit are simultaneously sent into ADC module and phase-locked loop circuit through whole ripple, amplification after handling with the rate signal that collects, directly send into the ADC module through the current signal that the current signal conditioning module was nursed one's health, again the signal after ADC module and phase-locked loop circuit processing is sent into the CPLD module; Described CPLD module transfers signals to DAC module and relay control module again; Described CPLD module also is transferred to the MCU hardware module by SPI full duplex synchronous communication interface with signal, and is calculated and judged rate signal and the current signal that collects through the CPLD module by the MCU software module; Described MCU software module is transferred to digital display modular to the tachometer value and the alarm signal that calculate by communication interface, finishes the number demonstration of rotating speed and the indication of template status lamp by digital display modular.
The unit of the tachometer value that described MCU software module calculates is: rev/min, rpm.
Totally four of described current signal conditioning module, each module all adopt to isolate to amplify and handle.
The sample frequency of described CPLD module controls ADC module.
Totally 4 relays in the described relay control module are respectively applied for that hypervelocity 103%, 110%, 114%, acceleration transfinite, power, load unbalanced judgement output.
Comprise EEROM, SRAM circuit in the described MCU hardware module, growth data space when the EEROM circuit is used for the calculating of MCU software module, the SRAM circuit is used for the static essential running parameter of preserving.
Described magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit are selected configuration by wire jumper.
Described template adopts the power supply of two-way 24VDC power supply, any one road power failure, do not influence the template proper functioning, power subsystem isolates the DC-DC power modules by two DC-DC general power conversion modules and six and several groups of power converting circuits are formed, guarantee the work independence between current signal conditioning module, DAC module, relay control module and template simulation, the digital channel, improved the job security of template.
A kind of Multifunction can accurately be measured slow-revving turbine over template; for realizing newly-increased judge power, load unbalanced function; template configuration four road current signals receive, conditioning circuit is used for receiving the 4-20mA current signal of representing three tunnel row pressure power, one tunnel electric power respectively that transmits; and every road processing circuit all adopts isolation processing; guaranteed the independence of its work; improved reliability, the current signal that collects is sent into MCU and is calculated and judge after the ADC analog-to-digital conversion.
For improving the disposed of in its entirety ability and the speed of response of template, template has adopted high-performance 16 single-chip microcomputers and high performance programmable logic array CPLD formation control core fast, this control core access speed is exceedingly fast, simultaneously by the abundant I/O mouth of CPLD, can simplify the template circuit, improve form integrated level, thereby strengthen the template reliability.
For meeting or exceeding the performance on testing the speed with class template, template adopts special-purpose 16 A/D chips to join MCU inner high speed working cell and signals of rotational speed sensor is sampled and handles, in the MCU software module, adopted simultaneously unique software filtering algorithm, effectively raise the measuring range and the precision of rotating speed, can realize the accurate measurement that 1-5500 changes.
This template has been equipped with the DAC modular circuit simultaneously, can realize the 4-20mA current signal output of corresponding rotating speed, for other assemblies obtaining rotating speed.
The relay control module of template configuration contains No. four relay output circuits altogether, and relay dry contact output mode is all adopted in external connection output, guarantees to provide when dissimilar alarm condition occur different alarm control signals.
For improve template convenience of use and state visuality, template configuration digital display modular, this module adopts 8 PIC single-chip microcomputers at a high speed to carry out exchanges data as control core and template MCU by serial communication, demonstration rotating speed that can be real-time, stable (unit: rev/min, rpm) and the warning light of indication response.
Template adopts the power supply of two-way 24VDC power supply, any one road power failure, do not influence the template proper functioning, power subsystem isolates the DC-DC power modules by two DC-DC general power conversion modules and six and several groups of power converting circuits are formed, guarantee the work independence between current signal conditioning module, DAC module, relay control module and template simulation, the digital channel, improved the job security of template.
As shown in Figure 2, the present invention adopts the circuit kit plate, is integrated with to isolate on this circuit board to amplify conditioning circuit, accurate amplification circuit, whole wave circuit, phase-locked loop circuit, ADC analog to digital conversion circuit, CPLD circuit, MCU circuit, DAC D/A converting circuit, control relay circuit, memory expansion circuit, PIC single-chip microcomputer and liquid crystal display circuit.
Eddy current sensor signals needs to put in order earlier ripple after inserting template handles, and nursing one's health out can be for the stable waveform of other processing of circuit, and physical circuit figure as shown in Figure 3.
It is to handle eddy current sensor signals or handle the magnetoresistive transducer signal that template is selected by wire jumper J10, then signal is amplified through instrument amplifier AD620 and handle, again the signal that amplified is handled by the translation that amplifier OP07 and double operational OPA2364 carry out signal, because the comparative voltage of AD is 2.5V, in order to cooperate modulus conversion chip AD73360 to gather demand, so need be to about the 2.5V the parallel moving of signal that collects, amplify the signal of processing again by double operational OPA2364 through AD620 simultaneously, voltage comparator LM311, buffer 2G34, the circuit that light lotus root TLP115A forms carries out filtering, shaping, translation is handled, export to phase-locked loop circuit then, as shown in Figure 4.
Phase-locked loop circuit is to be transferred to CPU again after carrying out 8 frequency divisions through the signal shaping after the analog circuitry processes and to signal, and when ensuring signal quality, big divider ratio can reduce the load of CPU, and physical circuit figure as shown in Figure 5.
All need to isolate the amplification processing for four road 4-20mA current signals that are input on the template, and then be input to the AD chip, physical circuit figure as shown in Figure 6.
The AD chip carries out analog-to-digital conversion to the signal of treated mistake, is transferred to CPU by CPLD (EPM7128STC100-10) in the spi bus mode again and handles, as shown in Figure 7.
That MCU adopts is 16 single-chip microcomputer XC164CS of top grade of the advanced person of Infineon company, has expanded a slice EEROM (CYZC1021) and a slice SRAM (FM26640) simultaneously, carries out exchanges data by spi bus between MCU and the CPLD, as shown in Figure 8.
The 4-20mA current signal of corresponding tachometer value, through CPLD 16 DA chips of control (AD420) output, physical circuit as shown in Figure 9 by MCU.
The alarm relay signal is controlled the actuating of relay of corresponding driving circuit drives by MCU through CPLD, as shown in figure 10.
By TXD, RXD serial ports corresponding rotating speeds value and warning message are transferred to the display circuit of being made up of pic chip (PIC18F2520) and status indicator lamp etc., circuit as shown in figure 11.
Adopted the principle of IIR type digital filter to carry out software filtering for the calculating of rotating speed and handled, shown in following 2 formulas of principle:
Wherein,
For each divalent radical this section, can the direct II type of transposition structure be realized, schematic diagram as shown in figure 12, represented is that the form of difference equation is as follows: y (n)=a
0Y (n-1)+a
1Y (n-2)+a
2Y (n-3)+b
0X (n)+b
1X (n-1)+b
2X (n-2)+b
3X (n-3).
The present invention is multi-functional can accurately to measure slow-revving turbine over template and compares difference with traditional turbine over template and be: reliably realize under the prerequisite of turbine over function guaranteeing; improved the measuring accuracy of rotating speed; realized the demand of suitable variety classes velocity transducer simultaneously; and increased power, load unbalanced arbitration functions and increased digital Presentation Function, and stable dry contact alarm and protection signal output is provided.
Claims (10)
1, a kind of Multifunction can accurately be measured slow-revving turbine over template, comprise signal processing system and power subsystem, it is characterized in that: described signal processing system comprises rate signal conditioning module, current signal conditioning module, ADC module, DAC module, MCU module, CPLD module, relay control module, digital display modular; Be provided with magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit in the described rate signal conditioning module, and be connected with the ADC module; Described DAC module, relay control module are connected with the CPLD module; Described CPLD module is connected by SPI full duplex synchronous communication interface with the MCU module.
2, a kind of Multifunction according to claim 1 can accurately be measured slow-revving turbine over template, it is characterized in that: described digital display modular links to each other by the UART asynchronous serial communication interface with the MCU module.
3, a kind of Multifunction according to claim 1 can accurately be measured slow-revving turbine over template, it is characterized in that: described MCU module comprises the MCU hardware module of transmission signal and the MCU software module of processing signals; Described rate signal conditioning module comprises that frequency signal puts in order wave circuit, accurate amplification circuit, phase-locked loop circuit, and described phase-locked loop circuit is connected with electric convolution speed sensor signal collecting treatment circuit with the magnetoresistive type velocity transducer.
4, a kind of Multifunction according to claim 3 can accurately be measured slow-revving turbine over template, the step that it is characterized in that the processing signals flow process is: the magnetoresistive type velocity transducer of described rate signal conditioning module setting and electric convolution speed sensor signal collecting treatment circuit are simultaneously sent into ADC module and phase-locked loop circuit through whole ripple, amplification after handling with the rate signal that collects, directly send into the ADC module through the current signal that the current signal conditioning module was nursed one's health, again the signal after ADC module and phase-locked loop circuit processing is sent into the CPLD module; Described CPLD module transfers signals to DAC module and relay control module again; Described CPLD module also is transferred to the MCU hardware module by SPI full duplex synchronous communication interface with signal, and is calculated and judged rate signal and the current signal that collects through the CPLD module by the MCU software module; Described MCU software module is transferred to digital display modular to the tachometer value and the alarm signal that calculate by communication interface, finishes the number demonstration of rotating speed and the indication of template status lamp by digital display modular.
5, can accurately measure slow-revving turbine over template according to claim 1 or 4 described a kind of Multifunctions, it is characterized in that: totally four of described current signal conditioning module, each module all adopt to isolate to amplify and handle.
6, describedly a kind ofly multi-functionally can accurately measure slow-revving turbine over template according to claim 1 or 4, it is characterized in that: the sample frequency of described CPLD module controls ADC module.
7, describedly a kind ofly multi-functionally can accurately measure slow-revving turbine over template according to claim 1 or 4; it is characterized in that: totally 4 relays in the described relay control module are respectively applied for that hypervelocity 103%, 110%, 114%, acceleration transfinite, power, load unbalanced judgement output.
8, according to claim 3ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template; it is characterized in that: comprise EEROM, SRAM circuit in the described MCU hardware module; growth data space when the EEROM circuit is used for the calculating of MCU software module, SRAM circuit are used for the static essential running parameter of preserving.
9, according to claim 1ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template, it is characterized in that: described magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit are selected configuration by wire jumper.
10, according to claim 1ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template; it is characterized in that: described template is the power supply of two-way 24VDC power supply, and power subsystem is made up of two DC-DC general power conversion modules and six isolation DC-DC power modules.
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| CNB2007100493808A CN100491701C (en) | 2007-06-27 | 2007-06-27 | Multifunctional steam turbine overspeed protection formwork capable of accurately measuring low revolution speed |
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| CNB2007100493808A CN100491701C (en) | 2007-06-27 | 2007-06-27 | Multifunctional steam turbine overspeed protection formwork capable of accurately measuring low revolution speed |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551678B (en) * | 2008-04-03 | 2011-03-30 | 新华威尔液压系统(上海)有限公司 | Rotational speed measuring device |
| CN102536349A (en) * | 2010-12-17 | 2012-07-04 | 阿尔斯通技术有限公司 | Steam turbine overspeed protection method and system |
| CN103790814A (en) * | 2014-02-14 | 2014-05-14 | 华电国际电力股份有限公司山东分公司 | Heating network steam-driven circulation water pump system |
| CN104502687A (en) * | 2014-12-19 | 2015-04-08 | 上海发电设备成套设计研究院 | High-withstand-voltage generator excitation current collector based on magnetic isolation |
| CN106990358A (en) * | 2017-05-02 | 2017-07-28 | 国网重庆市电力公司 | A kind of rotating speed criterion computational methods of power load unbalance protection |
| CN110080837A (en) * | 2019-06-06 | 2019-08-02 | 东方电气自动控制工程有限公司 | The control module decided by vote using two from three logic |
-
2007
- 2007-06-27 CN CNB2007100493808A patent/CN100491701C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551678B (en) * | 2008-04-03 | 2011-03-30 | 新华威尔液压系统(上海)有限公司 | Rotational speed measuring device |
| CN102536349A (en) * | 2010-12-17 | 2012-07-04 | 阿尔斯通技术有限公司 | Steam turbine overspeed protection method and system |
| CN103790814A (en) * | 2014-02-14 | 2014-05-14 | 华电国际电力股份有限公司山东分公司 | Heating network steam-driven circulation water pump system |
| CN104502687A (en) * | 2014-12-19 | 2015-04-08 | 上海发电设备成套设计研究院 | High-withstand-voltage generator excitation current collector based on magnetic isolation |
| CN106990358A (en) * | 2017-05-02 | 2017-07-28 | 国网重庆市电力公司 | A kind of rotating speed criterion computational methods of power load unbalance protection |
| CN106990358B (en) * | 2017-05-02 | 2020-04-24 | 国网重庆市电力公司 | Rotating speed criterion calculation method for power load unbalance protection |
| CN110080837A (en) * | 2019-06-06 | 2019-08-02 | 东方电气自动控制工程有限公司 | The control module decided by vote using two from three logic |
| CN110080837B (en) * | 2019-06-06 | 2023-12-08 | 东方电气自动控制工程有限公司 | Control module adopting three-out-of-two logic voting |
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|---|---|
| CN100491701C (en) | 2009-05-27 |
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Effective date of registration: 20110607 Address after: 618000, Deyang hi tech Industrial Park, Sichuan, Jiangxi Road, Jinsha 666 Co-patentee after: Sichuan Orient Electric Automatic Control Engineering Co., Ltd. Patentee after: Dongfang Turbine Co., Ltd., Dongfang Electric Group Address before: 618000 No. three, 18 South Mount Lu Road, Sichuan, Deyang Patentee before: Sichuan Orient Electric Automatic Control Engineering Co., Ltd. |
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Address after: 618000 Jinsha Jiangxi Road, high tech Industrial Park, Deyang, Sichuan, 666 Co-patentee after: Dongfang Electric Automatic Control Engineering Co., Ltd. Patentee after: Dongfang Turbine Co., Ltd., Dongfang Electric Group Address before: 618000 Deyang High-tech Industrial Park, Sichuan Province, 666 Jinsha Jiangxi Road Co-patentee before: Sichuan Orient Electric Automatic Control Engineering Co., Ltd. Patentee before: Dongfang Turbine Co., Ltd., Dongfang Electric Group |
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Granted publication date: 20090527 Termination date: 20190627 |
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| CF01 | Termination of patent right due to non-payment of annual fee |