CN106680531B - A kind of high reliability nuclear power field pump speed measuring device - Google Patents
A kind of high reliability nuclear power field pump speed measuring device Download PDFInfo
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- CN106680531B CN106680531B CN201710049004.2A CN201710049004A CN106680531B CN 106680531 B CN106680531 B CN 106680531B CN 201710049004 A CN201710049004 A CN 201710049004A CN 106680531 B CN106680531 B CN 106680531B
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- power supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses a kind of high reliability nuclear power field pump speed measuring devices, including power supply unit, speed probe, signal conditioning unit and signal processing unit, the counting circuit of power supply, the comparison circuit of signal conditioning unit and signal processing unit all uses redundancy to be arranged, simultaneously, it is additionally provided with amplitude limiter circuit, to improve accuracy, stability, flexibility and the reliability of entire nuclear power field pump speed measuring device.
Description
Technical field
The present invention relates to nuclear power plants to digitize instrument control technical field, and in particular to a kind of high reliability nuclear power field pump speed survey
Measure device.
Background technique
The numerous characteristics parameter of equipment is determined by the functional relation of itself and revolving speed, therefore revolving speed is energy device and power
An important characteristic parameters in measuring mechanical property.Nuclear power plant is equipped with more pumps, and the revolving speed of these pumps is for nuclear power plant
Safety is most important, and nuclear-power reactor rear class safety system needs accurately to obtain the revolving speed of these pumps, meanwhile, pump speed conduct
Nuclear Safety protects the input process amount of equipment, all has very high requirement to its stability and accuracy.
Pump speed is measured using speed probe, current speed probe is divided into contact and contactless, core
What electrical domain was selected is magneto-electric noncontacting proximity sensor.Nuclear-power reactor rear class safety system will be pumped accurately
Speed needs first to improve the nonstandard signal that speed probe exports for industrial standard electric signal, then the key technology that pump speed measures
It is how to handle the nonstandard signal of speed probe output.The prior art usually passes through following two mode: 1, by dedicated
The conditioning of speed probe output signal is first 4mA-20mA current signal corresponding with revolving speed by conditioning module, then by current signal
It is sent into rear class safety level protection system or non-security grade equipment.Sensor signal conditioning module design is standalone chassis by this method
The complexity of design is increased, while being transmitted to the anti-interference of transmitting path using 4mA-20mA analog signals with higher
It is required that being reduced in the measurement accuracy that complicated applications environment is be easy to cause.2, sensor output signal is sent directly into nuclear-power reactor
Rear class protects system, converts pulse signal for pseudo-sine signal by being compared to signal, and using counter to square wave
Corresponding revolving speed amount is converted to after signal-count.This method is compared using fixed threshold comparator, wherein comparator not fellow disciple
The setting of limit influences whether the accuracy of signal judgement, while cannot flexibly be compatible with the sensor of different output amplitudes.In reality
Border application in, in order to adapt to the measurement of dissimilar sensor, turn number, while need measuring device have highly reliable internal circuit
Structure is to meet the reliability of measurement result.
Summary of the invention
The technical problem to be solved by the present invention is to accurate, stable measurement is carried out to nuclear power field pump speed, it is therefore intended that
A kind of high reliability nuclear power field pump speed measuring device is provided, current measuring device measurement inaccuracy, anti-interference ability are solved
Problem weak, stability is poor.
The present invention is achieved through the following technical solutions:
A kind of high reliability nuclear power field pump speed measuring device, including power supply unit, speed probe, signal conditioning unit
And signal processing unit, wherein
The power supply unit is electrically connected with speed probe, signal conditioning unit and signal processing unit, is used for revolving speed
Sensor, signal conditioning unit, signal processing unit power supply；
The speed probe output end is electrically connected with signal conditioning unit input terminal, for obtaining pump speed signal, and will
It is sent to signal conditioning unit；
The signal conditioning unit output end is electrically connected with signal processing unit input terminal, for sending speed probe
Pump speed signal square-wave signal be converted to by pseudo-sine signal be sent to signal processing unit；The signal conditioning unit is specifically wrapped
The first comparison circuit and the second comparison circuit are included, the first comparison circuit input terminal and the second comparison circuit input terminal are all connected with
Speed probe output end, the first comparison circuit output end and the second comparison circuit output end are all connected with signal processing unit input
End；
The square-wave signal that the signal processing unit is used to export signal conditioning unit counts, and count value is turned
It is changed to industrial standard electric signal, as measurement pump speed output.
Particularly, the signal conditioning unit further includes pretreatment unit, and the pretreatment unit includes low-pass filter
And amplitude limiter circuit, successively low-pass filtered device and amplitude limiter circuit input the first comparison circuit and the second ratio to speed probe output end
Compared with circuit.
Particularly, first comparison circuit uses integral contrast circuit, and second comparison circuit is compared using hysteresis
Circuit.
Particularly, the signal processing unit includes AND gate circuit, the first counting circuit, the second counting circuit and processing
Device, AND gate circuit input terminal connection signal conditioning unit output end, AND gate circuit output end connect the first counting circuit input terminal
With the second counting circuit input terminal, the first counting circuit output end and the second counting circuit output end connect processor input terminal,
The external reactor protection group of processor output end.
Particularly, first counting circuit uses integrated chip counting circuit, and second counting circuit is using discrete
Piece count circuit.
Particularly, the power supply unit includes first power source unit and second power source unit, the first power source unit with
Signal processing unit electrical connection, the second power source unit are electrically connected with speed probe and signal conditioning unit.
Particularly, the first power source unit includes the first hot plug module and the first power isolation module, outside first
Power supply is successively powered through first power source unit and the first hot plug module to signal processing unit；The second power source unit includes
Second hot plug module and second source isolation module, the second external power supply is successively through second power source unit and the second hot plug mould
Block is powered to speed probe and signal conditioning unit.
Particularly, the high reliability nuclear power field pump speed measuring device is set in reactor protection system cabinet.
Compared with prior art, the present invention having the following advantages and benefits:
A kind of high reliability nuclear power field pump speed measuring device of the present invention, measurement accuracy is high, and strong antijamming capability can
It is good by property, stability.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is a kind of high reliability nuclear power field pump speed measuring device circuit structure block diagram that the embodiment of the present invention 1 provides.
Fig. 2 is amplitude limiter circuit, the circuit theory of integral contrast circuit and hysteresis comparison circuit that the embodiment of the present invention 1 provides
Figure.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1
As shown in FIG. 1, FIG. 1 is a kind of high reliability nuclear power field pump speed measuring device electricity that the embodiment of the present invention 1 provides
Line structure block diagram.
In the present embodiment, the high reliability nuclear power field pump speed measuring device specifically includes power supply unit, revolution speed sensing
Device, signal conditioning unit and signal processing unit.
The power supply unit includes first power source unit and second power source unit, and the first power source unit includes the first heat
Plug-in module and the first power isolation module, the first external power supply is successively through first power source unit and the first hot plug module to letter
The power supply of number processing unit；The second power source unit includes the second hot plug module and second source isolation module, outside second
Power supply is successively powered through second power source unit and the second hot plug module to speed probe and signal conditioning unit.The power supply list
Member connects external power supply, including the independent power supply of two-way using redundant topology mode, and the common cause fault because of power supply is avoided to lead
Cause measuring device power down.Meanwhile every road independent current source is designed with hot plug module, is managed to external input power, to every
Overcurrent, over-voltage, overpower of road input power etc. are monitored, and when monitoring certain power failure all the way, cut off the road
Power supply, avoids damaging measuring device because of power failure, it is ensured that the stability of power supply in measuring device operation.Further, power supply
Unit divides two-way to give measuring device power supply, wherein power all the way to speed probe and signal conditioning unit, all the way to signal at
Unit power supply is managed, power isolation module is set in the power supply circuit of the road Bing Mei, to input a signal into, at conditioning unit and signal
It manages unit and carries out effective electrical isolation, and then realize being isolated for analog circuit and digital circuit, reduce high in digital circuit
Interference of the frequency signal to analog circuit avoids crosstalk of the signal processing unit to signal conditioning unit.
The speed probe is electrically connected with signal conditioning unit, obtains pump speed signal, and send it to signal condition
Unit.Speed probe is divided into contact and contactless, and what nuclear power field was selected is magneto-electric noncontacting proximity sensor, therefore this
Speed probe described in embodiment uses magneto-electric noncontacting proximity sensor.
Speed probe output signal is sinusoidal signal, and signal conditioning unit input terminal connects speed probe output end,
Signal conditioning unit output end connection signal processing unit input terminal, the pump speed signal that speed probe is sent is by sinusoidal signal
It is converted to square-wave signal and is sent to signal processing unit.The signal conditioning unit includes that the first comparison circuit and the second comparison are electric
Road, the first comparison circuit use integral contrast circuit, and the second comparison circuit uses hysteresis comparison circuit, the input of integral contrast circuit
End and hysteresis comparison circuit input terminal are all connected with speed probe output end, integral contrast circuit output end and hysteresis comparison circuit
Output end is all connected with signal processing unit input terminal.
The preferred embodiment of the present embodiment is speed probe output end and integral contrast circuit input end and hysteresis ratio
Compared with pretreatment unit is additionally provided between circuit input end, the pretreatment unit includes low-pass filter and amplitude limiter circuit, revolving speed
Successively low-pass filtered device connects the first comparison circuit input terminal with amplitude limiter circuit to sensor output and the second comparison circuit is defeated
Enter end.Low-pass filter is the prior art, and amplitude limiter circuit, integral contrast circuit and hysteresis comparison circuit are as shown in Fig. 2, Fig. 2 is
The circuit diagram of amplitude limiter circuit, integral contrast circuit and hysteresis comparison circuit that the embodiment of the present invention 1 provides.
The amplitude limiter circuit, integral contrast circuit and hysteresis comparison circuit include operational amplifier A0, first comparator A1,
Second comparator A2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, capacitor C1 and diode D1.Wherein, all the way through first resistor R1 after the low-pass filtered device filtering of sensor output tach signal
The negative input end of operational amplifier A0 is connected, connects the negative input end of first comparator A1 all the way；First reference voltage passes through all the way
The positive input terminal of second resistance R2 connection operational amplifier A0, the positive input all the way through 3rd resistor R3 connection first comparator A1
End；It is set between the negative input end and output end of operational amplifier A0 after capacitor C1 and diode D1 are in parallel, diode D1's
Anode connects the negative input end of operational amplifier A0, the output end of the cathode connection operational amplifier A0 of diode D1；4th electricity
Resistance R4 is set between the positive input terminal and output end of first comparator A1；Second reference voltage is through the 6th resistance R6 connection second
The negative input end of comparator A2, the 5th resistance R5 are set to the output end of operational amplifier A0 and the positive input of the second comparator A2
Between end, the output end of the output end of first comparator A1 and the second comparator A2 are separately connected in signal processing unit and door electricity
Two input terminals on road.
In the signal conditioning unit, filter circuit filters out the impurity in speed probe output signal, obtains clean
Signal；Amplitude limiter circuit will be more than the signal progress equal proportion decaying for improving range in speed probe output signal, so as to the survey
Amount device can be compatible with different speed probes.Filtering, the signal after clipping are improved by two ways with will be sinusoidal
Signal is converted to square-wave signal.A kind of signal of mode after filtering, clipping starts integral contrast when being greater than the first reference voltage
Circuit, integral contrast circuit acquire and accumulate speed probe in the magnetic flux change amount of speed cycle, reach when variable quantity is accumulative
To setting the second reference voltage when, the second comparator A2 of triggering exports the square-wave signal of corresponding width；Another way wave, limit
Signal after width generates square-wave signal after passing through first comparator A1 compared with the first reference voltage.Wherein, first way mentions
The high effect to noise suppressed in on-site signal, meanwhile, different doors is arranged by the first reference voltage, the second reference voltage
Fiducial value is limited, two ways mutually makes up the accurate judgement reached to signal, only when the output of two ways is all high level
Signal processing unit is just counted when signal, which can effectively filter out external interference signal, is improved
The quality of conditioned signal output, ensure that the measurement accuracy of signal processing unit, and increase device can be high.
The square-wave signal that the signal processing unit sends signal conditioning unit counts, and count value is converted to
Industrial standard electric signal, as measurement pump speed output.The signal processing unit includes AND gate circuit, integrated circuit counting electricity
Road, discrete device counting circuit and processor, two input terminals of AND gate circuit be separately connected integral contrast circuit output end and
Hysteresis comparison circuit output end, AND gate circuit output end connect integrated circuit counting circuit input terminal and discrete device counting circuit
Input terminal, integrated circuit counting circuit output end connect processor input terminal, processor with discrete device counting circuit output end
The external reactor protection group of output end.
The pump speed of nuclear power field is measured as low-frequency test application.In order to guarantee revolving speed conversion accuracy, the present embodiment is using survey
Periodic method, the i.e. two neighboring meter that the high frequency clock signal of selection given frequency generates signal conditioning circuit as baseline
The interval time of number square wave measures, and the revolving speed conversion accuracy of this method can reach 0.1%F.S.
The square-wave signal obtained by two kinds of conditioning modes of integral contrast device and hysteresis loop comparator through AND gate circuit carry out with
Counting pulse signal is generated after logic, respectively by integrated circuit counting circuit and discrete device counting circuit to AND gate circuit
The counting pulse signal of output is counted, and processor reads the count results of two kinds of counting modes simultaneously and handled, and is pressed
Take a mode (1oo2D) to determine count results according to two to ensure the reliability of count value, processor treated data pass through from
The LVDS bus for defining agreement is sent into safety level as pump speed measurement result and protects system.
The preferred embodiment of the present embodiment is that the high reliability nuclear power field pump speed measuring device is set to reactor
It protects in system cabinet, measurement result is sent into protection system by way of core bus (LVDS bus), reduces data biography
The bit error rate and response time during sending, it is ensured that pump speed measurement result is entering nuclear-power reactor protection system or monitoring system
The accuracy of tachometer value when system.
Technical solution of the present invention ensures the stability of equipment operation power supply using redundant power topology and hot plug technology,
The framework of processor and logical process chip is used to carry out data processing and communication task respectively to improve device signal processing
The measurement result of processor is sent into protection system by way of core bus (LVDS bus) by ability, logic chip；Using
Amplitude limiter circuit ensures the compatible speed probe for not allowing type；Two kinds of manner of comparison are compared using integral contrast and hysteresis and improve letter
Number conditioning Stability and veracity；Ensure the reliable of signal processing using two kinds of counting modes of integrated circuit and discrete device
Property；Using by test device be set in reactor protection system cabinet reduce measurement result output during the bit error rate, from
And improve accuracy, stability, flexibility and the reliability of entire nuclear power field pump speed measuring device.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of high reliability nuclear power field pump speed measuring device, which is characterized in that including power supply unit, speed probe, letter
Number conditioning unit and signal processing unit, wherein
The power supply unit is electrically connected with speed probe, signal conditioning unit and signal processing unit, for passing to revolving speed
Sensor, signal conditioning unit, signal processing unit power supply；
The speed probe output end is electrically connected with signal conditioning unit input terminal, for obtaining pump speed signal, and is sent out
It send to signal conditioning unit；
The signal conditioning unit output end is electrically connected with signal processing unit input terminal, the pump for sending speed probe
Fast signal is converted to square-wave signal by sinusoidal signal and is sent to signal processing unit；The signal conditioning unit specifically includes first
Comparison circuit and the second comparison circuit, the first comparison circuit input terminal and the second comparison circuit input terminal are all connected with revolving speed biography
Sensor output end, the first comparison circuit output end and the second comparison circuit output end are all connected with signal processing unit input terminal；
The square-wave signal that the signal processing unit is used to send signal conditioning unit counts, and count value is converted to
Industrial standard electric signal, as measurement pump speed output；First comparison circuit uses integral contrast circuit, and described second compares
Circuit uses hysteresis comparison circuit；The signal processing unit include AND gate circuit, the first counting circuit, the second counting circuit and
Two input terminals of processor, AND gate circuit are separately connected the first comparison circuit output end and the second comparison circuit output end, with
Gate output connects the first counting circuit input terminal and the second counting circuit input terminal, the first counting circuit output end and the
Two counting circuit output ends connect processor input terminal, the external reactor protection group of processor output end.
2. high reliability nuclear power field pump speed measuring device according to claim 1, which is characterized in that the signal condition
Unit further includes pretreatment unit, and the pretreatment unit includes low-pass filter and amplitude limiter circuit, speed probe output end
Successively low-pass filtered device connects the first comparison circuit and the second comparison circuit with amplitude limiter circuit.
3. high reliability nuclear power field pump speed measuring device according to claim 1, which is characterized in that described first counts
Circuit uses integrated circuit counting circuit, and second counting circuit uses discrete device counting circuit.
4. high reliability nuclear power field pump speed measuring device according to claim 1, which is characterized in that the power supply unit
Including first power source unit and second power source unit, the first power source unit is electrically connected with signal processing unit, and described second
Power supply unit is electrically connected with speed probe and signal conditioning unit.
5. high reliability nuclear power field pump speed measuring device according to claim 4, which is characterized in that first power supply
Unit includes the first hot plug module and the first power isolation module, and the first external power supply is successively through first power source unit and first
Hot plug module is powered to signal processing unit；The second power source unit includes that the second hot plug module and second source are isolated
Module, the second external power supply is successively through second power source unit and the second hot plug module to speed probe and signal conditioning unit
Power supply.
6. high reliability nuclear power field pump speed measuring device according to any one of claims 1 to 5, which is characterized in that described
High reliability nuclear power field pump speed measuring device is set in reactor protection system cabinet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710049004.2A CN106680531B (en) | 2017-01-23 | 2017-01-23 | A kind of high reliability nuclear power field pump speed measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710049004.2A CN106680531B (en) | 2017-01-23 | 2017-01-23 | A kind of high reliability nuclear power field pump speed measuring device |
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| Publication Number | Publication Date |
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| CN106680531A CN106680531A (en) | 2017-05-17 |
| CN106680531B true CN106680531B (en) | 2019-07-30 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108152526A (en) * | 2018-02-06 | 2018-06-12 | 中广核研究院有限公司北京分公司 | Nuclear power station main pump rotation-speed measuring device |
| CN112134545B (en) * | 2020-09-25 | 2022-04-22 | 中国核动力研究设计院 | Trapezoidal forming method, system, terminal and medium based on optimal filter |
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| GB2258049B (en) * | 1991-07-20 | 1994-10-19 | Westland Aerostructures Ltd | Vehicle wheel speed sensors,& method of converting a sine wave signal in a counting or measuring device |
| EP0902292B1 (en) * | 1997-08-14 | 2003-12-10 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Method for correcting the signal of a speed sensor |
| CN101324633A (en) * | 2008-07-25 | 2008-12-17 | 清华大学 | Rotary speed sensor with bus interface for automobile |
| CN103869094A (en) * | 2012-12-14 | 2014-06-18 | 中国核动力研究设计院 | Main pump rotation speed measurement signal processing method |
| CN105424966A (en) * | 2015-12-11 | 2016-03-23 | 中国航空工业集团公司西安航空计算技术研究所 | Engine rotating speed measurement circuit and method |
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2017
- 2017-01-23 CN CN201710049004.2A patent/CN106680531B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2258049B (en) * | 1991-07-20 | 1994-10-19 | Westland Aerostructures Ltd | Vehicle wheel speed sensors,& method of converting a sine wave signal in a counting or measuring device |
| EP0902292B1 (en) * | 1997-08-14 | 2003-12-10 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Method for correcting the signal of a speed sensor |
| CN101324633A (en) * | 2008-07-25 | 2008-12-17 | 清华大学 | Rotary speed sensor with bus interface for automobile |
| CN103869094A (en) * | 2012-12-14 | 2014-06-18 | 中国核动力研究设计院 | Main pump rotation speed measurement signal processing method |
| CN105424966A (en) * | 2015-12-11 | 2016-03-23 | 中国航空工业集团公司西安航空计算技术研究所 | Engine rotating speed measurement circuit and method |
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| CN106680531A (en) | 2017-05-17 |
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Effective date of registration: 20201225 Address after: No.3, Hongda South Road, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee after: CHINA NUCLEAR CONTROL SYSTEM ENGINEERING Co.,Ltd. Address before: 610000, No. three, 28 south section of Ring Road, Chengdu, Sichuan Patentee before: NUCLEAR POWER INSTITUTE OF CHINA |
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