CN201057059Y - 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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- CN201057059Y CN201057059Y CNU2007200800996U CN200720080099U CN201057059Y CN 201057059 Y CN201057059 Y CN 201057059Y CN U2007200800996 U CNU2007200800996 U CN U2007200800996U CN 200720080099 U CN200720080099 U CN 200720080099U CN 201057059 Y CN201057059 Y CN 201057059Y
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Abstract
The utility model discloses a novel multi-functional steam turbine overspeed protection template, which comprises a signal processing system and a power supply subsystem. The template is characterized in that the signal processing system comprises a speed signal conditioning module, a current signal conditioning module, 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 sensor signal gathering and processing circuits of a magnetic reluctance type speed sensor and a current vortex speed sensor, which are connected with the ADC module and a phase locked loop circuit; the DAC module and the relay control module are connected with the CPLD module; the CPLD module is connected with the MCU module through an SPI full duplex synchronous communication interface; the digital display module is connected with the MCU module through a UART asynchronous serial communication interface. The utility model adopts modular design, improves the integration level, the interference immunity and the performance indexes of the template, and simultaneously reduces the production cost.
Description
Technical field
The utility model relates to steam turbine security system field, refers to testing the speed and Over speed Protection Unit in the steam turbine security system especially, and 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.
The model utility content
The purpose of this utility model is 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, strengthens function, the raising level of integration reduces cost simultaneously.
The technical solution of the utility model 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; The CPLD module that described DAC module, relay control module and being used to controlled ADC module samples frequency is connected; Described CPLD module is connected by SPI with the MCU module; Described digital display modular links to each other by UART 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, and SPI is exactly the full duplex synchronous communication interface, and UART is exactly an asynchronous serial communication interface.
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.
Described current signal conditioning module is by adopting four modules of isolating the amplification processing to form.
Described relay control module comprises four relays.
Described MCU hardware module comprises the Electrically Erasable Read Only Memory EEROM circuit in growth data space when being used for the MCU software module calculates and is used for the static Nonvolatile ferroelectric memory FRAM circuit of preserving essential running parameter.Rate signal that the MCU hardware module is collected through the CPLD module by the MCU software module and current signal calculate and judge whether speed transfinites, whether acceleration transfinites, the balance of power, load, controls the actuating of relay of output of DAC module and relay control module again.
Described magnetoresistive type velocity transducer and electric convolution velocity transducer are that wire jumper is selected configuration.The magnetoresistive type velocity transducer and the electric convolution speed sensor signal collecting treatment circuit that dispose simultaneously in the rate signal conditioning module, the rate signal that collects is sent into ADC module and phase-locked loop circuit through whole ripple, amplification after handling simultaneously, 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 template is the power supply of two-way 24VDC power supply, and described power subsystem is made up of DC-DC general power conversion module and six isolation DC-DC power modules that two direct currents become direct current (conversions of different DC electrical source values).
Beneficial effect of the present invention is as follows:
What the whole template of the utility model 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 the utility model turbine over template
Fig. 2 is the hardware structure diagram of the utility model turbine over template
Fig. 3 is that the utility model eddy velocity sensor signal is handled physical circuit figure
Fig. 4 handles physical circuit figure for the whole ripple of the utility model tach signal amplifies
Fig. 5 is the phase-locked processing physical circuit of the utility model phaselocked loop frequency division figure
Fig. 6 gathers isolation processing physical circuit figure for the utility model current signal
Fig. 7 is the utility model AD conversion treatment physical circuit figure
Fig. 8 is that the utility model MUC, CPLD, expansion EEROM and expansion SRAM connect physical circuit figure
Fig. 9 is the utility model DA conversion treatment physical circuit figure
Figure 10 drives physical circuit figure for the utility model relay
Figure 11 is the utility model LCD and the indication physical circuit figure that reports to the police
Figure 12 is the utility model software filtering algorithm principle figure
Embodiment
As shown in Figure 1, a kind of Multifunction can accurately be measured slow-revving turbine over template, adopt modular design, form integrated level and anti-interference etc. have been improved, this template comprises signal processing system and power subsystem 10, and described signal processing system comprises rate signal conditioning module 1, current signal conditioning module 2, ADC module 3, DAC module 4, MCU module, CPLD module 5, relay control module 6, digital display modular 7; In order to realize the adaptability of template to dissimilar velocity transducers, improve its signal handling capacity, be provided with magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit in the described rate signal conditioning module 1, and be connected with ADC module 3; The CPLD module 5 that described DAC module 4, relay control module 6 and being used to controlled ADC module 3 sample frequencys is connected; Described CPLD module 5 is connected by SPI with the MCU module; Described digital display modular 7 links to each other by UART with the MCU module.
Described MCU module comprises the MCU hardware module 8 of transmission signal and the MCU software module 9 of processing signals.
Described rate signal conditioning module 1 comprises that frequency signal puts in order wave circuit 11, accurate amplification circuit 12, phase-locked loop circuit 13, and described phase-locked loop circuit 13 is connected with electric convolution speed sensor signal collecting treatment circuit with the magnetoresistive type velocity transducer.
Described current signal conditioning module 2 is by adopting four modules of isolating the amplification processing to form.
Described relay control module 6 comprises four relays.
Described MCU hardware module 8 comprises the Electrically Erasable Read Only Memory EEROM circuit in growth data space when being used for MCU software module 9 calculates and is used for the static Nonvolatile ferroelectric memory FRAM circuit of preserving essential running parameter.Rate signal that collects through CPLD module 5 by 9 pairs of MCU hardware modules 8 of MCU software module and current signal calculate and judge whether speed transfinites, whether acceleration transfinites, the balance of power, load, controls the actuating of relay of 4 outputs of DAC module and relay control module 6 again.
Described magnetoresistive type velocity transducer and electric convolution velocity transducer are that wire jumper is selected configuration.The magnetoresistive type velocity transducer and the electric convolution speed sensor signal collecting treatment circuit that dispose simultaneously in the rate signal conditioning module 1, the rate signal that collects is sent into ADC module 3 and phase-locked loop circuit 13 through whole ripple, amplification after handling simultaneously, directly send into ADC module 3 through the current signal that current signal conditioning module 2 was nursed one's health, again the signal after ADC module 3 and phase-locked loop circuit 13 processing is sent into CPLD module 5.
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 10 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 software module 9 and is calculated and judge after ADC module 3 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 module 5 formation control cores fast, this control core access speed is exceedingly fast, pass through the I/O mouth that CPLD module 5 is enriched simultaneously, 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 MCU software module 9, 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 DAC module 4 circuit simultaneously, can realize the 4-20mA current signal output of corresponding rotating speed, for other assemblies obtaining rotating speed.
The relay control module 6 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 7, 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 10 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 1, DAC module 4, relay control module 6 and template simulation, the digital channel, improved the job security of template.
As shown in Figure 2, the utility model adopts the circuit kit plate, is integrated with to isolate on this circuit board to amplify conditioning circuit (being the current signal conditioning circuit) 2, accurate amplification circuit 11, whole wave circuit 12, phase-locked loop circuit 13, ADC analog to digital conversion circuit 3, CPLD circuit 5, MCU circuit, DAC D/A converting circuit 4, control relay circuit 6, memory expansion circuit, PIC single-chip microcomputer and liquid crystal display circuit (being digital display modular 7).
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 FRAM (FM26640) simultaneously, carries out exchanges data by spi bus between MCU and the CPLD, as Fig. 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 transposition direct
II type structure 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 (8)
1. a Multifunction can accurately be measured slow-revving turbine over template, comprise signal processing system and power subsystem (10), it is characterized in that: described signal processing system comprises that signal processing system comprises rate signal conditioning module (1), current signal conditioning module (2), ADC module (3), DAC module (4), MCU module, CPLD module (5), relay control module (6), digital display modular (7); Be provided with magnetoresistive type velocity transducer and electric convolution speed sensor signal collecting treatment circuit in the described rate signal conditioning module (1), and be connected with ADC module (3); The CPLD module (5) that described DAC module (4), relay control module (6) and being used to controlled ADC module (3) sample frequency is connected; Described CPLD module (5) is connected by SPI with the MCU module; Described digital display modular (7) links to each other by UART 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 comprising: described MCU module comprises the MCU hardware module (8) of transmission signal and the MCU software module (9) of processing signals.
3. according to claim 1ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template; it is characterized in that: described rate signal conditioning module (1) comprises that frequency signal puts in order wave circuit (11), accurate amplification circuit (12), phase-locked loop circuit (13), and described phase-locked loop circuit (13) is connected with electric convolution speed sensor signal collecting treatment circuit with the magnetoresistive type velocity transducer.
4. according to claim 1ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template, it is characterized in that: described current signal conditioning module (2) is amplified four modules handling and is formed by adopting to isolate.
5. according to claim 1ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template, it is characterized in that: described relay control module (6) comprises four relays.
6. according to claim 2ly a kind ofly multi-functionally can accurately measure slow-revving turbine over template, it is characterized in that: described MCU hardware module (8) comprises the Electrically Erasable Read Only Memory EEROM circuit in growth data space when being used for MCU software module (9) calculates and is used for the static Nonvolatile ferroelectric memory FRAM circuit of preserving essential running parameter.
7. 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 velocity transducer are that wire jumper is selected configuration.
8. 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 described power subsystem (10) becomes straight DC-DC general power conversion module and six isolation DC-DC power modules by two direct currents and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200800996U CN201057059Y (en) | 2007-06-27 | 2007-06-27 | Multifunctional steam turbine overspeed protection forwork capable of accurate measuring low revolution speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200800996U CN201057059Y (en) | 2007-06-27 | 2007-06-27 | Multifunctional steam turbine overspeed protection forwork capable of accurate measuring low revolution speed |
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| Publication Number | Publication Date |
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| CN201057059Y true CN201057059Y (en) | 2008-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200800996U Expired - Lifetime CN201057059Y (en) | 2007-06-27 | 2007-06-27 | Multifunctional steam turbine overspeed protection forwork capable of accurate measuring low revolution speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081010A (en) * | 2010-12-29 | 2011-06-01 | 南京科远自动化集团股份有限公司 | 4-channel eddy-current monitoring module |
-
2007
- 2007-06-27 CN CNU2007200800996U patent/CN201057059Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081010A (en) * | 2010-12-29 | 2011-06-01 | 南京科远自动化集团股份有限公司 | 4-channel eddy-current monitoring module |
| CN102081010B (en) * | 2010-12-29 | 2012-08-08 | 南京科远自动化集团股份有限公司 | 4-channel eddy-current monitoring module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SICHUAN ORIENT ELECTRIC AUTOMATIC CONTROL ENGINEER Owner name: DONGFANG TURBINE CO., LTD., DONGFANG ELECTRIC GROU Free format text: FORMER OWNER: SICHUAN ORIENT ELECTRIC AUTOMATIC CONTROL ENGINEERING CO., LTD. Effective date: 20110607 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 618000 NO. 18, SECTION 3 OF LUSHAN SOUTH ROAD, DEYANG CITY, SICHUAN PROVINCE TO: 618000 NO. 666, JINSHAJIANG WEST ROAD, DEYANG HIGH-TECH. INDUSTRIAL PARK, SICHUAN PROVINCE |
|
| TR01 | Transfer of patent right |
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. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20080507 |
|
| CX01 | Expiry of patent term |