CN106771610A - A kind of superconducting magnet quenches detecting system - Google Patents
A kind of superconducting magnet quenches detecting system Download PDFInfo
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- CN106771610A CN106771610A CN201510832225.8A CN201510832225A CN106771610A CN 106771610 A CN106771610 A CN 106771610A CN 201510832225 A CN201510832225 A CN 201510832225A CN 106771610 A CN106771610 A CN 106771610A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
A kind of superconducting magnet quenches detecting system and is compared two superconducting coils as one group to judge the generation for quenching.It is made up of voltage isolation correction link, calculus of differences circuit, signed magnitude arithmetic(al) circuit, analogue multiplication computing circuit, filter circuit, comparison circuit, realizes and quenches detection with protection to superconducting energy storage hybrid magnet.
Description
Technical field
The present invention relates to detect circuit, a kind of especially superconducting magnet quench-detection circuit.
Background technology
Simultaneously with the growth of electricity consumption, requirement of the society to power quality also more and more higher.And superconductive energy storage system provides new technological approaches to the fast response characteristic of system power demand to improve the stability of power system, while also having good technical advantage to improving the quality of power supply, improving reliability.Because superconducting magnet could only embody superconducting characteristic in the case where specified conditions are met, once condition is destroyed, superconducting magnet will be quenched.The basic process that superconducting magnet is quenched is the process that the electromagnetic energy for storing is changed into heat energy, and the heat energy of transformation is mainly absorbed by the normal area in external shifting energy resistance and coil.After superconducting magnet is quenched, if taking measures not in time, the hot-spot of generation may result in superconducting magnet and be burned out or cause insulation breakdown, influence safety and the stable operation of superconductive energy storage system, it is therefore necessary to quickly and accurately detect quenching for superconducting magnet.The detection method that quenches used both at home and abroad has temperature rise detection, pressure detecting, ultrasound examination, magnetic field detection and voltage detecting, wherein what is be most widely used is voltage detecting, remaining various detection method is actually rare in actual applications.Bridge circuit detection is the improvement of turn-to-turn voltage detecting, and it will conveniently and easily be realized than turn-to-turn voltage detecting, it is not necessary to install voltage sensor.But bridge circuit equally exists the problem of noise jamming, and, for alternating current circuit, outer meeting resistance can consume part energy.
Superconducting magnet is changed into normal state by superconducting state, i.e., so-called to quench.The reason for normality area occurs in winding mainly superconducting magnet operational factor exceedes critical value.As long as superconducting magnet has a basic parameter to exceed critical value in the process of running（Critical magnetic field, critical current and critical-temperature）, the superconducting property of superconductor will disappear, and winding just occurs normality area.
The content of the invention
Regarding to the issue above, the present invention devises a kind of superconducting magnet and quenches detecting system, can exclude noise jamming, and detection is quenched for hybrid magnet.
The technical solution adopted for the present invention to solve the technical problems is：
Two two superconducting coils are compared to judge the generation for quenching by the detecting system that quenches of superconducting magnet as one group.It is made up of voltage isolation correction link, calculus of differences circuit, signed magnitude arithmetic(al) circuit, analogue multiplication computing circuit, filter circuit, comparison circuit.
The voltage isolation correction link includes that coil voltage detects circuit and voltage isolating amplifier circuit, using active power detection method, and voltage difference measurement links is corrected.L1、L2It is two inductance of superconducting coil, r1And r2The resistance produced after being quenched for two superconducting coils.Active power detection method is by measurement
Value is quenched to detect.In L1=L2In the case of, when not quenching, r1And r2Zero is, it is also zero to detect P values, therefore display superconducting coil is not quenched.For L1≠L2Situation, when not quenching, although r1And r2Zero is, but due to L1≠L2, therefore, i.e., erroneous judgement is thus likely to result in the presence of a P value being not zero all the time, accordingly, it would be desirable to be corrected in voltage difference measurement links.Because erroneous judgement is due to induced electricity pressure differenceCause, then need to eliminate induced electricity pressure difference.The induced voltage of coil 1 isL1di/(dt), the induced voltage of coil 2 isL2di/(dt), as superconducting coil L2Output voltage v2Afterwards, to v2Carry out L1/L2Amplify again, i.e.,(L1/L2)v2 , then be compared with v1 by voltage difference measurement links, obtainv1-(L1/L2)v2=0, the influence of induced voltage generation is eliminated, the generation for quenching then is judged according to active power detection method.Adopt this method, for L1=L2 situations, then amplification coefficient(L1/L2)=1, it is equally applicable.
The coil voltage detection circuit selects low-power consumption, high-precision general purpose instrument amplifier INA128.Single non-essential resistance R3 can realize that any gain from 1~10000 is selected.R1 and R2 is current-limiting resistance, and R3 is gain resistor, and it is output as (1+50k/R3) (v1-v2).Adjustment ratio, is capable of achieving linear convergent rate.
The voltage isolating amplifier circuit is kept apart magnet with detection circuit and DSP using isolating device, protects whole detecting system.Its input, output end, therefore have.Its input and output are in a kind of linear relationship, and the gain of its isolated amplifier can be by adjusting R2With R1Ratio realize.Unilateral signal is accessed into voltage isolating amplifier circuit, the purpose of linear convergent rate and isolation is reached.
The calculus of differences circuit is voltage difference measurement links, realizes coil voltage difference function.Using INA128 instrument amplifiers, the induced voltage component on coil is adjusted to consistent, in voltage difference measurement links, acquirement is poor by the resistive voltage that coil quenches resistance generation.Meanwhile, absolute value circuit is added after voltage difference measurement links, degree difference is quenched due to coil, then the voltage of output has just negative, and absolute value processing circuit can cause that output signal is positive voltage signal, so facilitate subsequent conditioning circuit to process.
The signed magnitude arithmetic(al) circuit is made up of two operational amplifiers, because the situation that quenches of two coils for comparing not can determine that, the output of voltage difference measurement links may be on the occasion of being also possible to be negative value, signed magnitude arithmetic(al) takes absolute value to coil voltage difference, output signal is positive voltage signal, facilitate subsequent conditioning circuit to process.
The analogue multiplication computing circuit realizes the multiplication operation of active power detection method coil voltage difference and electric current, and output valve is compared with threshold value.Analog multiplier realizes active powerThe detection of value.Using RC4200 analog multipliers,, current-to-voltage converting circuit is added, by P1Value is exported in the form of a voltage.
The filter circuit is mutually cascaded using two-stage second order Butterworth LPF, Butterworth LPF amplitude-frequency response its amplitude closely ideal situation in low frequency, has steeper amplitude-frequency near cut-off frequency.Characteristic, and there is good attenuation to the high-frequency signal more than 10Hz, and it is little on low frequency signal influence, have by a relatively large margin because signal amplifies by prime, therefore selection low pass filter gain k=1.The cut-off frequency for selecting wave filter is 7.5Hz, takes C1=1 υ F, C2=2 υ F, can obtain R1=R2=15k.In addition to anti-stop signal self-excitation, in resistance R3Two ends and the mica capacitor of upper 56pF.
The comparison circuit uses comparator LM393, set a reference voltage, when superconducting coil is not quenched, the output signal of low pass filter is less than reference voltage, comparator is output as high level, and when superconducting coil is quenched, the output of low pass filter is more than reference voltage, comparator is output as low level, and so output according to comparator just can interpolate that out whether superconducting coil quenches.
The beneficial effects of the invention are as follows：Superconducting magnet quench that detecting system can be used for hybrid magnet quench signal detection, can be very good to solve the problems, such as noise jamming, can in time, the generation that effectively detection superconduction hybrid magnet is quenched.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is to quench signal detection system block diagram.
Fig. 2 is the voltage difference measurement links block diagram of correction.
Fig. 3 is coil voltage detection circuit.
Fig. 4 is voltage isolating amplifier circuit.
Fig. 5 is calculus of differences circuit.
Specific embodiment
In Fig. 1, two two superconducting coils are compared to judge the generation for quenching by the detecting system that quenches of superconducting magnet as one group.It is made up of voltage isolation correction link, calculus of differences circuit, signed magnitude arithmetic(al) circuit, analogue multiplication computing circuit, filter circuit, comparison circuit.
In fig. 2, the voltage isolation correction link includes that coil voltage detects circuit and voltage isolating amplifier circuit, using active power detection method, and voltage difference measurement links is corrected.L1、L2It is two inductance of superconducting coil, r1And r2The resistance produced after being quenched for two superconducting coils.Active power detection method is by measurementValue is quenched to detect.In L1=L2In the case of, when not quenching, r1And r2Zero is, it is also zero to detect P values, therefore display superconducting coil is not quenched.For L1≠L2Situation, when not quenching, although r1And r2Zero is, but due to L1≠L2, therefore, i.e., erroneous judgement is thus likely to result in the presence of a P value being not zero all the time, accordingly, it would be desirable to be corrected in voltage difference measurement links.Because erroneous judgement is due to induced electricity pressure differenceCause, then need to eliminate induced electricity pressure difference.The induced voltage of coil 1 isL1di/(dt), the induced voltage of coil 2 isL2di/(dt), as superconducting coil L2Output voltage v2Afterwards, to v2Carry out L1/L2Amplify again, i.e.,(L1/L2)v2 , then be compared with v1 by voltage difference measurement links, obtainv1-(L1/L2)v2=0, the influence of induced voltage generation is eliminated, the generation for quenching then is judged according to active power detection method.Adopt this method, for L1=L2 situations, then amplification coefficient(L1/L2)=1, it is equally applicable.
In figure 3, the coil voltage detection circuit selects low-power consumption, high-precision general purpose instrument amplifier INA128.Single non-essential resistance R3 can realize that any gain from 1~10000 is selected.R1 and R2 is current-limiting resistance, and R3 is gain resistor, and it is output as (1+50k/R3) (v1-v2).Adjustment ratio, is capable of achieving linear convergent rate.
In fig. 4, the voltage isolating amplifier circuit is kept apart magnet with detection circuit and DSP using isolating device, protects whole detecting system.Its is defeated, output end, therefore has.Its input and output are in a kind of linear relationship, and the gain of its isolated amplifier can be by adjusting R2With R1Ratio realize.Unilateral signal is accessed into voltage isolating amplifier circuit, the purpose of linear convergent rate and isolation is reached.
In Figure 5, the calculus of differences circuit is voltage difference measurement links, realizes coil voltage difference function.Using INA128 instrument amplifiers, the induced voltage component on coil is adjusted to consistent, in voltage difference measurement links, acquirement is poor by the resistive voltage that coil quenches resistance generation.Meanwhile, absolute value circuit is added after voltage difference measurement links, degree difference is quenched due to coil, then the voltage of output has just negative, and absolute value processing circuit can cause that output signal is positive voltage signal, so facilitate subsequent conditioning circuit to process.The signed magnitude arithmetic(al) circuit is made up of two operational amplifiers, because the situation that quenches of two coils for comparing not can determine that, the output of voltage difference measurement links may be on the occasion of being also possible to be negative value, signed magnitude arithmetic(al) takes absolute value to coil voltage difference, output signal is positive voltage signal, facilitate subsequent conditioning circuit to process.
The analogue multiplication computing circuit realizes the multiplication operation of active power detection method coil voltage difference and electric current, and output valve is compared with threshold value.Analog multiplier realizes active powerThe detection of value.Using RC4200 analog multipliers,, current-to-voltage converting circuit is added, by P1Value is exported in the form of a voltage.
The filter circuit is mutually cascaded using two-stage second order Butterworth LPF, Butterworth LPF amplitude-frequency response its amplitude closely ideal situation in low frequency, has steeper amplitude-frequency near cut-off frequency.Characteristic, and there is good attenuation to the high-frequency signal more than 10Hz, and it is little on low frequency signal influence, have by a relatively large margin because signal amplifies by prime, therefore selection low pass filter gain k=1.The cut-off frequency for selecting wave filter is 7.5Hz, takes C1=1 υ F, C2=2 υ F, can obtain R1=R2=15k.In addition to anti-stop signal self-excitation, in resistance R3Two ends and the mica capacitor of upper 56pF.
The comparison circuit uses comparator LM393, set a reference voltage, when superconducting coil is not quenched, the output signal of low pass filter is less than reference voltage, comparator is output as high level, and when superconducting coil is quenched, the output of low pass filter is more than reference voltage, comparator is output as low level, and so output according to comparator just can interpolate that out whether superconducting coil quenches.
Claims (9)
1. a kind of superconducting magnet quenches detecting system and is made up of voltage isolation correction link, calculus of differences circuit, signed magnitude arithmetic(al) circuit, analogue multiplication computing circuit, filter circuit, comparison circuit.
2. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that voltage isolation correction link includes that coil voltage detects circuit and voltage isolating amplifier circuit, using active power detection method, and voltage difference measurement links is corrected.
3. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that coil voltage detection circuit selects low-power consumption, high-precision general purpose instrument amplifier INA128.
4. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that the voltage isolating amplifier circuit is kept apart magnet with detection circuit and DSP using isolating device, protects whole detecting system,
, input is in a kind of linear relationship with output, and the gain of its isolated amplifier can be by adjusting R2With R1Ratio realize.
5. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that the calculus of differences circuit uses INA128 instrument amplifiers, induced voltage component on coil is adjusted to consistent, in voltage difference measurement links, acquirement is poor by the resistive voltage that coil quenches resistance generation；Meanwhile, absolute value circuit is added after voltage difference measurement links, degree difference is quenched due to coil, then the voltage of output has just negative, and absolute value processing circuit can cause that output signal is positive voltage signal.
6. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that the signed magnitude arithmetic(al) circuit is made up of two operational amplifiers.
7. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that the analogue multiplication computing circuit uses RC4200 analog multipliers,, current-to-voltage converting circuit is added, by P1Value is exported in the form of a voltage.
8. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that the filter circuit is mutually cascaded using two-stage second order Butterworth LPF, Butterworth LPF amplitude-frequency response its amplitude closely ideal situation in low frequency, has steeper amplitude-frequency near cut-off frequency.
9. superconducting magnet according to claim 1 quenches detecting system, it is characterized in that the comparison circuit uses comparator LM393, set a reference voltage, when superconducting coil is not quenched, the output signal of low pass filter is less than reference voltage, and comparator is output as high level, when superconducting coil is quenched, the output of low pass filter is more than reference voltage, and comparator is output as low level, and so output according to comparator just can interpolate that out whether superconducting coil quenches.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947114A (en) * | 2017-12-18 | 2018-04-20 | 合肥中科离子医学技术装备有限公司 | A kind of based superconductive magnet degree of balance detection and protection system |
| CN111579904A (en) * | 2020-05-18 | 2020-08-25 | 中国电力科学研究院有限公司 | Quench detection circuit and method for superconducting transformer winding |
| CN111707978A (en) * | 2020-07-09 | 2020-09-25 | 华中科技大学 | Quench detection method, device and equipment for superconducting magnet and storage medium |
| CN112285619A (en) * | 2020-10-28 | 2021-01-29 | 上海交通大学 | System and method for detecting loss of super magnetism of high-temperature superconducting cable |
-
2015
- 2015-11-25 CN CN201510832225.8A patent/CN106771610A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947114A (en) * | 2017-12-18 | 2018-04-20 | 合肥中科离子医学技术装备有限公司 | A kind of based superconductive magnet degree of balance detection and protection system |
| CN111579904A (en) * | 2020-05-18 | 2020-08-25 | 中国电力科学研究院有限公司 | Quench detection circuit and method for superconducting transformer winding |
| CN111707978A (en) * | 2020-07-09 | 2020-09-25 | 华中科技大学 | Quench detection method, device and equipment for superconducting magnet and storage medium |
| CN111707978B (en) * | 2020-07-09 | 2021-09-10 | 华中科技大学 | Quench detection method, device and equipment for superconducting magnet and storage medium |
| CN112285619A (en) * | 2020-10-28 | 2021-01-29 | 上海交通大学 | System and method for detecting loss of super magnetism of high-temperature superconducting cable |
| CN112285619B (en) * | 2020-10-28 | 2022-03-01 | 上海交通大学 | System and method for detecting loss of super magnetism of high-temperature superconducting cable |
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Application publication date: 20170531 |