CN103363886B - The throw sensor gamut temperature compensation of genset and system - Google Patents
The throw sensor gamut temperature compensation of genset and system Download PDFInfo
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Abstract
The invention discloses a kind of throw sensor gamut temperature compensation and system of genset, a gamut temperature compensation network is increased in the linearity correction network of sensor, comprehensive compensation sensor probe temperature is floated, the electromagnetic parameter temperature drift of tested metallic object, the stiffness of coupling relevant to displacement changes the situation such as temperature drift change and the drift of pre-detector oscillatory circuit device temperature caused, solve the gamut technique for temperature compensation problem of genset throw sensor, and do not need differential winding, do not need the probe coil of special substance, reduce manufacturing cost, applied widely, for different measured bodies, only need to carry out suitably adjusting to reach correspondingly compensating to gamut temperature compensation network relevant parameters, thus the gamut temperature compensation of all kinds of current vortex sensor is applicable to, possesses practicality widely.
Description
Technical field
The present invention relates to turbine-generator units monitoring technical field, be specifically related to a kind of throw sensor gamut temperature compensation of genset.
Background technology
Genset is the key equipment of power plant, the quality of operating states of the units directly affects the safe operation of power plant, genset shaft swing is excessive is one of the most common fault of genset, larger swing directly affects the safe operation of unit, and it is the important indicator evaluating unit operation quality, repair quality.Adopt online throw to monitor, can immediately, the running status of accurate evaluation unit, make maintenance decision according to set state, the time determining to detect, item and techniques, and predict the Residual service time of unit, to guarantee device security economical operation.
At present, market realizes the monitoring of genset throw and mainly adopts eddy current displacement sensor, the advantage of this sensor be can realize non-contact measurement, highly sensitive, response is fast; But its shortcoming is the impact being easily subject to temperature, and along with the increase of displacement, temperature drift is non-linear increase.For improving the measuring accuracy within the scope of current vortex sensor gamut further, need to carry out gamut temperature compensation.Current vortex sensor principle of work is as follows: according to spinulose tree fern time law, when coil in a high-frequency signal injection probe, just produces electromagnetic field of high frequency.When this magnetic fields is in metal conductor measured, then form an induction current on measured body surface, this induction current also produces an alternating magnetic field contrary with magnetic field.Therefore, these two magnetic fields superpose the impedance just changing probe coil mutually.The equiva lent impedance Z that coil is subject to after conductor impact is:
In formula: the real part of R1-coil impedance, it comprises the resistance of coil, and coil is together with magnetic loss electrolytical in skeleton; The inductance of L1-coil self; The equivalent resistance of R2-metal conductor measured, it depends on physical dimension and the resistivity in current vortex path; The equivalent inductance of L2-metal conductor measured; The coefficient of mutual inductance of M-between coil and measured conductor, increases with Distance Shortened between cell winding and measured body; ω-angular frequency.
Visible, current vortex sensor is the entity of current-carrying coil and tested metallic object, and its temperature stability depends primarily on following factor: the 1) temperature drift of sensor probe electrology characteristic, and it is mainly reflected in probe resistance and these two parameters of inductance; 2) resistance, the inductor loss temperature characterisitic of measured body; 3) temperature stability of testing circuit; 4) between probe and measured body, the temperature of stiffness of coupling is floated.
It can thus be appreciated that the factor of eddy current displacement sensor temperature influence almost comprises all parts and the material of sensing system, adopts traditional single parameter temperature compensation, can only meet general requirement, to accurate measurement, is difficult to reach desirable effect.
Be the measuring accuracy improved further within the scope of current vortex sensor gamut in prior art, generally need to carry out gamut temperature compensation; For this kind of sensor, traditional temperature compensation mainly contains two classes: probe coil penalty method (as special substance method, differential winding method) and pre-detector penalty method (as thermosensitive device method), under introducing respectively below:
1) probe coil penalty method, probe coil is manufactured as adopted special substance, adopt the variate temperature compensation etc. of compensating coil (comprising noninductive compensating coil), its object is all reduce probe coil resistance temperature as far as possible to drift about the impact of this factor on sensor temperature drift, and the temperature drift of its cofactor fails to consider, the electricity of tested metallic object in the use of this kind of sensor can not be reduced, parameter of magnetic characteristic, the various temperature drifts that the factors such as testing circuit and the current vortex stiffness of coupling relevant with displacement produce, thus gamut temperature compensation can not be realized,
2) pre-detector penalty method, as output stage thermal sensing element penalty method, it only carries out a temperature variant static compensation value to the output of sensor, reckon without tested metallic object eddy current effect temperature drift effects degree in the use of this kind of sensor to change with change in displacement, compensation rate and displacement have nothing to do, therefore can not realize gamut temperature compensation.
These traditional temperature compensations mainly focus on the compensation of some temperature drift factors, do not consider other factors causing temperature drift, can not realize gamut temperature compensation, cause the monitoring effect of genset throw sensor not good.
Summary of the invention
Mainly focusing on the compensation of some temperature drift factors in order to overcome traditional temperature compensation, not considering other factors causing temperature drift, causing the problem that the monitoring effect of genset throw sensor is not good.The throw sensor gamut temperature compensation of genset of the present invention, a gamut temperature compensation network is increased in the linearity correction network of sensor, the various temperature drift factors of comprehensive compensation sensor, realize amount of temperature compensation with change in displacement respective change, solve the gamut technique for temperature compensation problem of genset throw sensor, and be applicable to the gamut temperature compensation of all kinds of current vortex sensor, possess practicality widely.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A throw sensor gamut temperature compensation for genset, is characterized in that: comprise the following steps,
Step (1) sets up the gamut temperature compensation network of throw sensor;
The gamut temperature compensation network of step (1) is arranged in the pre-detector of genset throw sensor by step (2), is cascaded with the linearity correction network in pre-detector, forms novel linear corrective network;
Step (3) is installation environment temperature variation residing for throw sensor, the resistance value of the automatic regulating networks of gamut temperature compensation network, the novel linear corrective network set up in step (2) utilizes Nonlinear Adjustment characteristic, dynamically changes the amount of temperature compensation of the corresponding displacement point of throw sensor;
Step (4), when step (1) sets up the gamut temperature compensation network of throw sensor, increases output stage temperature compensation network in the output stage of pre-detector, compensates the temperature drift of the amplifying circuit in the power supply of pre-detector and pre-detector;
The gamut temperature influence curve that step (5) exports according to throw sensor, regulates the temperature coefficient of gamut temperature compensation network, obtains the temperature drift compensation substantially mated with each displacement point of gamut, realizes gamut temperature compensation.
The throw sensor gamut temperature compensation of aforesaid genset, is characterized in that: the described gamut temperature compensation network setting up throw sensor is obtained by the linearity correction network Nonlinear Adjustment network characteristic of acquisition throw sensor and the gamut output temperature influencing characteristic of throw sensor.
The throw sensor gamut temperature compensation of aforesaid genset, it is characterized in that: the gamut temperature compensation network that described step (1) is set up is formed in parallel by thermosensitive device R1 and potentiometer R2, described thermosensitive device R1 is linear posistor, the resistance of regulator potentiometer R2, changes the temperature compensation coefficient of gamut temperature compensation network.
The throw sensor gamut temperature compensation of aforesaid genset, is characterized in that: the resistance of described thermosensitive device R1 is 200 Ω ~ 1k Ω, and temperature coefficient is 1500 ~ 3200PPM/ DEG C; The resistance of described potentiometer R2 is 1k Ω ~ 10k Ω.
Run the bucking-out system of the throw sensor gamut temperature compensation of above-mentioned genset, comprise throw sensor probe coil, pre-detector and the rotating shaft of monitoring objective genset, described throw sensor probe coil is by the oscillating quantity of eddy current effect non-contact capture genset rotating shaft, the output terminal of throw sensor probe coil carries out gamut temperature compensation by pre-detector, described pre-detector comprises linearity correction network, oscillator, wave detector, wave filter, output stage temperature compensation network and amplifying circuit, described throw sensor probe coil is connected with linearity correction network with wave detector respectively by oscillator, described linearity correction network is connected with the gamut temperature compensation network for the sensor-based system temperature drift compensation matched with genset rotating shaft to each displacement point of gamut, described wave detector is connected by the input end of wave filter with output stage temperature compensation network, the output terminal of described output stage temperature compensation network is connected with amplifying circuit.
The throw sensor gamut temperature-compensated system of aforesaid genset, it is characterized in that: described gamut temperature compensation network is formed in parallel by thermosensitive device R1 and potentiometer R2, described thermosensitive device R1 is linear posistor, the resistance of regulator potentiometer R2, changes the temperature compensation coefficient of gamut temperature compensation network.
The throw sensor gamut temperature-compensated system of aforesaid genset, is characterized in that: the resistance of described thermosensitive device R1 is 200 Ω ~ 1k Ω, and temperature coefficient is 1500 ~ 3200PPM/ DEG C; The resistance of institute rheme device R2 is 1k Ω ~ 10k Ω.
The invention has the beneficial effects as follows: the throw sensor gamut temperature compensation of genset of the present invention, in the linearity correction network of sensor, increase by a gamut temperature compensation network, comprehensive compensation sensor probe temperature is floated, the electromagnetic parameter temperature drift of tested metallic object, the stiffness of coupling relevant to displacement changes the situation such as temperature drift change and the drift of pre-detector oscillatory circuit device temperature caused, solve the gamut technique for temperature compensation problem of genset throw sensor, and do not need differential winding, do not need the probe coil of special substance, reduce manufacturing cost, applied widely, for different measured bodies, only need to carry out suitably adjusting to reach correspondingly compensating to gamut temperature compensation network relevant parameters, thus the gamut temperature compensation of all kinds of current vortex sensor is applicable to, possesses practicality widely.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the throw sensor gamut temperature compensation of genset of the present invention.
Fig. 2 is the system chart of the throw sensor gamut temperature-compensated system of genset of the present invention.
Fig. 3 is the circuit theory diagrams of the throw sensor gamut temperature-compensated system of genset of the present invention.
Fig. 4 is the circuit theory diagrams of the gamut temperature compensation network of genset of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
The throw sensor gamut temperature compensation of genset of the present invention, comprises the following steps,
The first step, obtain throw linear sensor corrective network to the Nonlinear Adjustment characteristic of output voltage and throw sensor gamut output temperature influencing characteristic, according to Nonlinear Adjustment characteristic and the gamut output temperature influencing characteristic of linearity correction network, set up the gamut temperature compensation network of throw sensor;
Second step, is arranged on gamut temperature compensation network in the pre-detector of genset throw sensor, is cascaded with the linearity correction network in pre-detector, forms novel linear corrective network;
3rd step, installation environment temperature variation residing for throw sensor, the resistance value of the automatic regulating networks of gamut temperature compensation network, the novel linear corrective network of foundation utilizes Nonlinear Adjustment characteristic, dynamically changes the amount of temperature compensation of the corresponding displacement point of throw sensor;
4th step, while setting up the gamut temperature compensation network of throw sensor, increases output stage temperature compensation network in the output stage of pre-detector, compensates the temperature drift of the amplifying circuit in the power supply of pre-detector and pre-detector;
5th step, according to the gamut temperature influence curve that throw sensor exports, by the temperature coefficient of suitable adjustment gamut temperature compensation network, obtains the temperature drift compensation substantially mated with each displacement point of gamut, realizes gamut temperature compensation.
As shown in Figure 2, run the bucking-out system of the throw sensor gamut temperature compensation of above-mentioned genset, comprise throw sensor probe coil 8, pre-detector, the tested metallic object 9 that the rotating shaft of monitoring objective genset is formed, throw sensor probe coil 8 is by the oscillating quantity of the tested metallic object 9 of eddy current effect non-contact capture, the output terminal of throw sensor probe coil 8 carries out gamut temperature compensation by pre-detector, pre-detector comprises linearity correction network 2, oscillator 3, wave detector 4, wave filter 5, output stage temperature compensation network 6 and amplifying circuit 7, described throw sensor probe coil 8 is connected with linearity correction network 2 with wave detector 4 respectively by oscillator 3, linearity correction network 2 is connected with the sensor-based system temperature drift compensation gamut temperature compensation network 1 for matching with tested metallic object to each displacement point of gamut, described wave detector 4 is connected by the input end of wave filter 5 with output stage temperature compensation network 6, the output terminal of output stage temperature compensation network 6 is connected with amplifying circuit 7, relatively existing pre-detector, it adds gamut temperature compensation network 1 in linearity correction network 2 rear end of pre-detector, and linearity correction network 2 is negative feedback networks of oscillator 3, can comprehensively the probe coil 8 of throw sensor temperature drift, the electromagnetic parameter temperature drift of genset rotating shaft and tested metallic object 9, the stiffness of coupling relevant to displacement changes the various factors such as the temperature drift of temperature drift change and the pre-detector oscillator 3 caused.Along with temperature raises, the resistance value of gamut temperature compensation network 1 increases, and then change the resistance value of linearity correction network 2, utilize the Nonlinear Adjustment characteristic of linearity correction network, dynamically change the amount of temperature compensation of corresponding displacement point, by suitable adjustment, obtain the sensor-based system temperature drift compensation matched with measured body at each displacement point of gamut, thus realize gamut temperature compensation, output stage temperature compensation network 6 can compensate the power supply temperature drift of pre-detector and the drift of amplifying circuit 7 temperature, improves the throw accuracy of detection of genset rotating shaft.
As shown in Figure 3, the circuit theory diagrams of the throw sensor gamut temperature-compensated system of genset of the present invention, comprise gamut temperature compensation network I, linearity correction network II, oscillator III, wave detector IV, wave filter V, output stage temperature compensation network VI and amplifying circuit VII, correction resistance R4 wherein in gamut temperature compensation network I and linearity correction network II is cascaded, form novel linear corrective network II, it is a part for the negative feedback network of oscillator III, the characteristic of linearity correction network II is for when resistance increases, the negative feedback of oscillator strengthens, the output voltage of throw sensor is non-linear reduction, and when linearity correction network II resistance reduces, the negative feedback of oscillator III weakens, the output voltage of throw sensor is non-linear increase, the output of throw sensor changes because of the temperature drift of various parameter, when temperature drift raises, exports and presents non-linear growth with displacement increase, be equivalent to linearity correction network resistance and reduce, when the temperature decreases, export and present non-linear reduction with displacement increase, be equivalent to linearity correction network resistance and increase, in conjunction with above feature, when temperature drift raises, by being increased by gamut temperature compensation network I resistance, linearity correction network II resistance is increased, otherwise, when the temperature decreases, by being reduced by gamut temperature compensation network I resistance, linearity correction network resistance II is reduced, the temperature compensation coefficient of suitable adjustment gamut temperature compensation network, just can the temperature drift of each displacement point of compensation sensor, realizes gamut temperature compensation.
Gamut temperature compensation network circuit theory diagrams as shown in Figure 4, be formed in parallel by linear positive temperature coefficient (PTC) thermosensitive device R1 and temperature compensation coefficient regulator potentiometer R2, wherein thermosensitive device R1 preferable temperature coefficient can be the linear posistor of 1500PPM/ DEG C, resistance is 200 Ω ~ 1k Ω, preferred resistance is 470 Ω, the resistance of potentiometer R2 is 1k Ω ~ 10k Ω, preferred 2k Ω.Thermistor R1 is in parallel with potentiometer R2, adjusts different temperatures coefficient by potentiometer R2, to realize more suitable temperature compensation.Its compensation process is as follows, when the temperature increases, sensor exports and increases in non-linear increase with displacement on the one hand, and on the other hand, R1 resistance value increases, the corresponding increase of gamut temperature compensation network resistance value that R1 and R2 parallel connection is formed, makes the resistance of whole linearity correction network increase, thus sensor is exported with displacement increase in non-linear reduction; When temperature reduces, its mechanism is contrary; Thus regulated by suitable temperature compensation coefficient, greatly can weaken the output temperature drift of the even each displacement point of basic neutralisation sensor, thus reach gamut effect temperature compensation.This gamut temperature compensation network combines with the output stage temperature compensation network of pre-detector, the temperature drift coefficient of each for the gamut of sensor displacement point can be controlled lower 0.05%/DEG C within the scope of.
In sum, the throw sensor gamut temperature compensation of genset of the present invention, in the linearity correction network of sensor, increase by a gamut temperature compensation network, comprehensive compensation sensor probe temperature is floated, the electromagnetic parameter temperature drift of tested metallic object, the stiffness of coupling relevant to displacement changes the situation such as temperature drift change and the drift of pre-detector oscillatory circuit device temperature caused, solve the gamut technique for temperature compensation problem of genset throw sensor, and do not need differential winding, do not need the probe coil of special substance, reduce manufacturing cost, applied widely, for different measured bodies, only need to carry out suitably adjusting to reach correspondingly compensating to gamut temperature compensation network relevant parameters, thus the gamut temperature compensation of all kinds of current vortex sensor is applicable to, possesses practicality widely.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. the throw sensor gamut temperature compensation of genset, is characterized in that: comprise the following steps,
Step (1) sets up the gamut temperature compensation network of throw sensor;
The gamut temperature compensation network of step (1) is arranged in the pre-detector of genset throw sensor by step (2), is cascaded with the linearity correction network in pre-detector, forms novel linear corrective network;
The temperature variation of step (3) installation environment residing for throw sensor, the resistance value of the automatic regulating networks of gamut temperature compensation network, the novel linear corrective network set up in step (2) utilizes Nonlinear Adjustment characteristic, dynamically changes the amount of temperature compensation of the corresponding displacement point of throw sensor;
Step (4), when step (1) sets up the gamut temperature compensation network of throw sensor, increases output stage temperature compensation network in the output stage of pre-detector, compensates the temperature drift of the amplifying circuit in the power supply of pre-detector and pre-detector;
The gamut temperature influence curve that step (5) exports according to throw sensor, regulates the temperature coefficient of gamut temperature compensation network, obtains the temperature drift compensation substantially mated with each displacement point of gamut, realizes gamut temperature compensation;
The described gamut temperature compensation network setting up throw sensor is obtained by the linearity correction network Nonlinear Adjustment network characteristic of acquisition throw sensor and the gamut output temperature influencing characteristic of throw sensor;
The gamut temperature compensation network that described step (1) is set up is formed in parallel by thermosensitive device R1 and potentiometer R2, described thermosensitive device R1 is linear posistor, the resistance of regulator potentiometer R2, changes the temperature compensation coefficient of gamut temperature compensation network;
The resistance of described thermosensitive device R1 is 200 Ω ~ 1k Ω, and temperature coefficient is 1500 ~ 3200PPM/ DEG C; The resistance of described potentiometer R2 is 1k Ω ~ 10k Ω.
2. run the bucking-out system of throw sensor gamut temperature compensation of genset according to claim 1, it is characterized in that: comprise throw sensor probe coil (8), tested metallic object (9) that pre-detector, the rotating shaft of monitoring objective genset are formed; Described throw sensor probe coil (8) is by the oscillating quantity of eddy current effect non-contact capture genset rotating shaft, and the output terminal of described throw sensor probe coil (8) carries out gamut temperature compensation by pre-detector; Described pre-detector comprises linearity correction network (2), oscillator (3), wave detector (4), wave filter (5), output stage temperature compensation network (6) and amplifying circuit (7); Described throw sensor probe coil (8) is connected with linearity correction network (2) with wave detector (4) respectively by oscillator (3); Described linearity correction network (2) is connected with the gamut temperature compensation network (1) of the sensor-based system temperature drift compensation for matching with tested metallic object (9) to each displacement point of gamut, described wave detector (4) is connected by the input end of wave filter (5) with output stage temperature compensation network (6), and the output terminal of described output stage temperature compensation network (6) is connected with amplifying circuit (7).
3. the throw sensor gamut temperature-compensated system of genset according to claim 2, it is characterized in that: described gamut temperature compensation network (1) is formed in parallel by thermosensitive device R1 and potentiometer R2, described thermosensitive device R1 is linear posistor, the resistance of regulator potentiometer R2, changes the temperature compensation coefficient of gamut temperature compensation network.
4. the throw sensor gamut temperature-compensated system of genset according to claim 2, is characterized in that: the resistance of described thermosensitive device R1 is 200 Ω ~ 1k Ω, and temperature coefficient is 1500 ~ 3200PPM/ DEG C; The resistance of described potentiometer R2 is 1k Ω ~ 10k Ω.
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| CN104729396A (en) * | 2015-03-24 | 2015-06-24 | 浙江大学 | High-temperature eddy-current displacement sensor temperature compensation method based on temperature online measurement and sensing device |
| US10705162B2 (en) * | 2015-12-03 | 2020-07-07 | Lifeassays Ab | Temperature controlled magnetic permeability detector |
| CN106124797B (en) * | 2016-06-13 | 2020-02-14 | 安徽容知日新科技股份有限公司 | Oscillator drift compensation device and method and rotating speed sensor |
| CN109916285A (en) * | 2018-07-04 | 2019-06-21 | 珠海格力电器股份有限公司 | A kind of wide range eddy current displacement sensor |
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