CN209070020U - A kind of device of Measurement of Superconducting Magnet A.C.power loss - Google Patents
A kind of device of Measurement of Superconducting Magnet A.C.power loss Download PDFInfo
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- CN209070020U CN209070020U CN201821329157.9U CN201821329157U CN209070020U CN 209070020 U CN209070020 U CN 209070020U CN 201821329157 U CN201821329157 U CN 201821329157U CN 209070020 U CN209070020 U CN 209070020U
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Abstract
The utility model discloses a kind of devices of Measurement of Superconducting Magnet A.C.power loss, and the device mainly includes data acquisition module and processing and display modules.The core component of data acquisition module is data collecting card, uses it to acquire voltage and current signal when superconducting magnet to be checked work；By the online control of software and hardware of LabVIEW software realization data collecting card and processing and display module, collected voltage and current signal is transmitted in processing and display module；Energy balane formula is utilized in processing and display module, i.e. voltage and current integral formula handles the data received, the total energy variation of calculated superconducting magnet subtracts the energy variation of superconducting magnet equivalent inductance to be checked, it can obtains the A.C.power loss measurement result of superconducting magnet to be checked.By the utility model solve existing A.C.power loss measurement method speed it is slow, it is complicated for operation, the problems such as small coil can only be measured.
Description
Technical field
The utility model belongs to Superconducting Power Technology field, more particularly, to one kind in any current waveform work
Under the conditions of work, the measuring device of high-temperature superconducting magnet A.C.power loss.
Background technique
Superconducting Power Technology is realizing the lightweight of electric device, miniaturization, low energy consumption and the safety for improving electric system
Property, stability and power quality etc. are of great significance and broad prospect of application, extensive use will bring conventional electric power
The significant innovation of industry.
The superconductor for transmitting DC current, without joule thermal losses.When superconductor is in the magnetic field that changes over time, or
When transmitting the electric current changed over time, superconductor can generate loss, and this loss is known as the A.C.power loss of superconductor.A.C.power loss
Be problem inevitable in application of high temperature super-conductive power: superconducting magnet of the work under communicational aspects can generate A.C.power loss；
Work the superconducting magnet under quasi-static, and such as superconducting magnetic energy storage can generate A.C.power loss during fast charging and discharging；I.e.
Just A.C.power loss can also be generated during flowing up and dropping stream for stable state magnet, such as high-intensity magnetic field magnet.
A.C.power loss can aggravate the burden of refrigeration system, if thermal losses the system of being cooled cannot be taken away in time, will lead to
Magnet temperature increases, and temperature rise can cause the reduction of critical current, and then increase A.C.power loss, finally makes magnet local temperature rapid
Rise, generates normal state (often leading state) to induce in superconducting conductor.If the heat that normal state generates cannot be effective
Cooling and dispersion absorbs, and the temperature of normal state constantly increases, and generates adjacent superconducting state along the heat of conducting wire conduction new
Normal state, i.e. conducting wire cannot stablize in superconducting state.When its operating parameter is more than critical to superconducting magnet under the conditions of thermal agitation
Parameter will lead to superconductor and lose superconducting characteristic, i.e. superconducting magnet quenches.Fig. 1 shows thermal agitation bring in superconducting device
Stability problem.
Existing A.C.power loss measurement method includes electrical measuring method, magnetic survey method and thermal method；Wherein, electrical measuring method has sensitivity
It is high, measurement range is wide, the relatively simple advantage of equipment, therefore be widely used.When transmitting alternating current, the voltage of superconducting magnet
It can be analyzed to differ 90 ° of perceptual voltage and the resistive voltage with current in phase with current phase；Superconducting magnet inductance is larger,
Perceptual voltage is far longer than resistive voltage, when using lock-in amplifier Measurement of Superconducting Magnet, due to the maximum of lock-in amplifier
Input is 1V, for the resistive component of voltage of precise measurement and meets lock-in amplifier to the input restrictive condition of voltage, it is necessary to
The perceptual voltage for the compensation magnets that take measures.There is following limitation with the A.C.power loss of such method Measurement of Superconducting Magnet: (1)
Superconducting magnet often has biggish inductance value, therefore its perceptual component of voltage is often very big, is difficult during actual measurement
It can be compensated, therefore the coil of some low values can only be measured；(2) since the signal in compensation process is all sinusoidal letter
Number, so this measurement method is only used for the A.C.power loss that Measurement of Superconducting Magnet works under sinusoidal current operating condition；(3) it uses
When lock-in amplifier measures resistive component, need to lead to reference signal and superconducting magnet voltage signal in the input of lock-in amplifier
Road is toggled, and operating process is very complicated；(4) compensation circuit be all it is direct or indirect accessed in main circuit, it is difficult
Exempt from that burden can be increased to system or brings other trouble.
Utility model content
Aiming at the above defects or improvement requirements of the prior art, the utility model provides a kind of Measurement of Superconducting Magnet exchange
The device of loss, thus solving electrical measuring method Measurement of Superconducting Magnet A.C.power loss there is technical issues that.
To achieve the above object, the utility model provides a kind of device of Measurement of Superconducting Magnet A.C.power loss, comprising: electricity
Source module, current divider R, the first divider resistance R1, the second divider resistance R2, data acquisition module and processing and display module；
The power module, for providing power supply for described device；
The current divider R, for being connected in parallel on the both ends of the power module after connecting with superconducting magnet to be checked, to measure line
Electric current in road；
The first divider resistance R1With the second divider resistance R2For being connected in parallel on the superconducting magnet to be checked after series connection
Both ends, with the total voltage at the superconducting magnet both ends to be checked be more than the data acquisition module maximum range voltage when,
Voltage division processing is carried out to the total voltage of the superconducting magnet to be checked；
The first end of the data acquisition module is connect with the first end of the current divider R；The data acquisition module
Second end is connect with the second end of the current divider R；The third end of the data acquisition module and the second divider resistance R2
First end connection；4th end of the data acquisition module and the second divider resistance R2Second end connection, use
The form of Differential Input, it is respectively that the magnet voltage value of the voltage value at the both ends the current divider R and the superconducting magnet to be checked is defeated
Enter in two channels of the data collecting card of the data acquisition module, with obtain the superconducting magnet to be checked voltage signal and
Current signal；
The processing and display module are connect with the data acquisition module, for being transmitted according to the data acquisition module
The superconducting magnet to be checked voltage signal and current signal obtain the superconducting magnet to be checked gross energy variation, Jin Eryou
The gross energy variation subtracts the energy variation of the equivalent inductance of the superconducting magnet to be checked, obtains the superconducting magnet to be checked
A.C.power loss, and show measurement result.
Preferably, the power module includes: signal generator, power amplifier and protective resistance R3；
The signal generator is connect with the power amplifier, for controlling the output of the power amplifier, so that
The power amplifier provides power supply for described device；
The protective resistance R3The both ends of the power amplifier are connected in parallel on, for protecting the power amplifier.
Preferably, the processing and display module include human-computer interaction interface；
The human-computer interaction interface includes that channel creation, sample rate setting, time interval input and current divider coefficient are set
It sets.
Preferably, the total voltage at the superconducting magnet both ends to be checked is more than the maximum range electricity of the data acquisition module
When pressure, the magnet voltage value of the superconducting magnet to be checked is the total voltage value at the superconducting magnet both ends to be checked at described second point
Piezoresistance R2The partial pressure value at both ends, the total voltage at the superconducting magnet both ends to be checked are not above the data acquisition module
When maximum range voltage, the magnet voltage value of the superconducting magnet to be checked is the total voltage value at the superconducting magnet both ends to be checked.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Column the utility model has the advantages that
1, the utility model only needs the voltage and current of Measurement of Superconducting Magnet that the friendship of superconducting magnet can be calculated
Stream loss does not use the condition for being necessarily less than 1V for voltage when lock-in amplifier to limit, does not need the electricity to superconducting magnet
Pressure compensates, operating process very simple.
2, the utility model is not necessarily less than the voltage of superconducting magnet the limitation of 1V, as long as therefore superconducting magnet it is total
The maximum value of voltage is less than the maximum input range of data collecting card, and such the utility model, which can measure to possess, to be compared
The A.C.power loss of the superconducting magnet of big inductance value, is worth with very big practical engineering application, and traditional measurement method can only
The A.C.power loss for measuring small magnet, can only be used as laboratory research.
3, traditional measurement method requires compensation device since superconducting magnet voltage is too high, can only measure sinusoidal electricity
When flowing the A.C.power loss under operating condition, but actually using superconducting power device, device is not often work in standard sine electric current
Under operating condition, the utility model evaded conventional method can only Measurement of Superconducting Magnet work in A.C.power loss under sinusoidal current,
But it can be measured under the electric current even operating condition of aperiodic current of random waveform.
To sum up, provided by the utility model for measuring superconduction for the various aspects such as operation, speed, application scenarios
The new method of magnet alternating-current loss has been above traditional measurement method.
Detailed description of the invention
Fig. 1 is a kind of survey based on integration method principle Measurement of Superconducting Magnet A.C.power loss provided by the embodiment of the utility model
Measure the structural schematic diagram of device；
Fig. 2 is a kind of NI data collecting card provided by the embodiment of the utility model and the online schematic illustration of host computer；
Fig. 3 is a kind of host computer operating software implementation method flow diagram provided by the embodiment of the utility model；
Fig. 4 is that a kind of device and lock-in amplifier difference Measurement of Superconducting Magnet work provided by the embodiment of the utility model produces
The comparative result figure of raw A.C.power loss.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below
The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.
The utility model provides a kind of device that A.C.power loss under random waveform is worked in for detecting superconducting magnet,
The A.C.power loss of superconducting magnet can be directly and quickly measured, and avoid operation cumbersome when measuring using lock-in amplifier
Process.Using the A.C.power loss of the detection device Measurement of Superconducting Magnet of the utility model, when superconducting magnet is due to A.C.power loss mistake
When hot, utility model device can measure excessively high A.C.power loss in time and alarm, and be the reliable work of superconducting magnet
Provide the foundation guarantee.
It is the measuring device based on integration method principle Measurement of Superconducting Magnet A.C.power loss that embodiment provides shown in Fig. 1
Schematic illustration；In the present embodiment, superconducting magnet to be measured is indicated by the L in Fig. 1；This superconducting magnet that embodiment provides is handed over
Flowing loss measurement device includes signal generator, power amplifier, data acquisition module, current divider R, divider resistance R1And R2, protect
Protect resistance R3；Wherein, signal generator is used to control the output of power amplifier, and power amplifier provides electricity to entire circuit
Source；Protective resistance R3The both ends of power amplifier are connected in parallel on for protection power source；After current divider R connects with superconducting magnet L to be checked
The both ends of protective resistance are connected in parallel on, for measuring the electric current in route；When the total voltage on superconducting magnet L to be checked is adopted more than data
When the maximum range voltage of truck, need to the total voltage progress voltage division processing on superconducting magnet L to be checked to acquire, R1And R2
For divider resistance, after partial pressure operation, voltage value U that actual acquisition arrives1It is calculated with following formula:
Wherein, ULFor the total voltage of superconducting magnet L to be checked, to be checked surpass is acquired by integral formula in processing and display module
Only need to be multiplied by corresponding ratio (R after the A.C.power loss of magnetizer1+R2)/R2It can be obtained by actual loss value；It needs
It is noted that if the voltage U of superconducting magnet to be checkedLIn measurement range, R1And R2Investment circuit will not be used.
Data acquisition module uses the form of Differential Input, respectively by the voltage value and magnet voltage value at the both ends current divider R
In two channels of (or voltage after partial pressure) access data collecting card (PXIE4305 can be used), so that it may respectively
Obtain the voltage and current signals of superconducting magnet L to be checked；Then need by collected data be sent into processing and display module into
Row processing, it is preferable that the control software selected in the utility model embodiment can be LabVIEW, and Fig. 2 show NI data and adopts
The online schematic illustration of truck and processing and display module, it is only necessary to the NI-DAQmx in LabVIEW Calling Fig. 2
Software-driven can realize online, the realization data communication of processing and display module and data acquisition module.
Wherein, use the programmed method flow chart of LabVIEW as shown in figure 3, in flow chart in processing and display module
The creation basic programs such as equipment and initialization operation can call directly；It can wrap in the man-machine interface write using LabVIEW
Include: " file name ", " sample rate setting ", " channel selecting ", " Memory adjustments ", " maximum value and minimum value ", " time interval ",
" current divider parameter " and " loss result " display unit.
Wherein, " file name " is used to input the filename that user wants preservation on interface, and " sample rate setting " is for controlling
The sample rate of data collecting card processed, " channel selecting " are used to create the channel that user thinks acquisition equipment to be used, " memory tune
It is whole " for opening up the spatial cache of an interim storing data in processing and display module, " maximum value and minimum value " is used for
The maximum voltage value that selection data collecting card can input, " time interval " for inputting above-mentioned integral duration T, that is, what is measured is
A.C.power loss of the superconducting magnet to be checked in T time section, " current divider parameter " are used to input between the current divider voltage and current used
Conversion coefficient, will finally calculate the A.C.power loss of resulting superconducting magnet as the result is shown in " loss result ".
In the utility model embodiment, processing and display module are believed according to the voltage signal and electric current of superconducting magnet to be checked
The gross energy variation of superconducting magnet to be checked number is obtained, and then subtracts by gross energy variation the energy of the equivalent inductance of superconducting magnet to be checked
Amount variation, obtains the A.C.power loss of superconducting magnet to be checked, can pass through the classical formulas of energy balane --- voltage and current integral
Formula is used for after measurement obtains superconducting magnet voltage and current signal to be checked, further calculates to obtain the friendship of superconducting magnet to be checked
Stream loss, specifically:
It is used for after measurement obtains superconducting magnet voltage and current signal to be checked using voltage and current integral formula, into one
The A.C.power loss of superconducting magnet to be checked is calculated in step.A.C.power loss is generated when superconducting magnet to be checked works under AC Condition
When, superconducting magnet to be checked is equivalent to an inductance and an extremely small resistance is series in route, since inductance only has electricity
The exchange of magnetic energy, the loss without being converted into thermal energy, so the measurement of the active power of superconducting magnet to be checked is asked at this time
Topic has reformed into the power measurement problem of the small resistance.In order to measure the power of the small resistance, it is assumed that superconducting magnet to be measured
Total active energy is W, and the energy variation of the small resistance is WR, the energy variation in equivalent inductance is WL, superconducting magnet to be checked
Voltage is u (t), and the component of voltage of inductance is u in equivalent circuitL(t), the resistive component of voltage of small resistance is uR(t), in route
Electric current be i (t), then available following formula:
Wherein, τ is integral start time, and T is total mark duration.Particularly, when the operating current of superconducting magnet to be checked is
When periodic current, it sets T to the cycle length of electric current, at this time due to the characteristic of inductance, the energy variation of inductance is 0 i.e. WL=
0, the voltage and current of superconducting magnet to be checked is subjected to integral operation according to formula (2) at this time, so that it may directly obtain superconducting magnetic to be checked
The A.C.power loss of body is as a result, be that the energy variation of superconducting magnet to be checked at this time is equal to the energy quantitative change of the equivalent small resistance of superconducting magnet
Change W=WR..If superconducting magnet to be checked works in aperiodic current operating condition, the energy variation of superconducting magnet to be checked is by two parts
It constitutes, a part is the energy for storing or discharging in equivalent inductance, and another part is then the A.C.power loss of superconducting magnet to be checked.It is logical
Superconducting magnet to be checked energy variation total in period T can be readily available by crossing formula (2), it is only necessary to acquire inductance in this section
Energy variation in time, it can subtract inductance energy with gross energy and change to obtain A.C.power loss, following calculating can be passed through
Formula calculates the energy variation of inductance and the A.C.power loss of superconducting magnet.
L is the inductance of superconducting magnet to be checked, I in formulaaAnd IbFirst and last electricity of the superconducting magnet respectively to be checked in period T
Flow valuve needs after the electric current for obtaining superconducting magnet to be checked to reduce due to noise bring measurement error in current signal
Carry out software filtering to it, it is hardware filtering bring phase in order to prevent that hardware filtering why is not had to using software filtering
Drift.
When measuring Ac Losses of Superconducting Magnet to be checked in the utility model embodiment, due in superconducting magnet voltage to be checked
Perceptual weight is smaller, it is therefore desirable to the higher data acquisition module of precision.Preferred American National in the utility model embodiment
Core of the PXIE4305 data collecting card of instrument company's production as the data acquisition module of superconducting magnet to be checked, this is adopted
Truck possesses 32 channels, 24 bit resolutions, 51.2KS/s sample rate and ± 42 volts of input voltage ranges.Such data acquisition
Card can only measurement voltage signal, so needing to be converted into voltage signal, this reality when measuring the electric current of superconducting magnet to be checked
With this function is realized in new embodiment using current divider.Current divider and superconducting magnet to be checked series connection simultaneously are entered into main line
In, since the voltage of current divider is directly proportional to its electric current, and its electric current is equal with the electric current of superconducting magnet to be checked.And it because shunts
The resistance value of device is very small and is noninductive, so will not bring adverse effect, nothing to system having sealed in current divider
Perception also makes the electric current of the current signal measured and route not have a phase drift, thus by current divider voltage can obtain to
Examine the electric current of superconducting magnet.
The utility model is described in detail with specific example below.
The superconducting magnet turned in the present embodiment using superconducting tape will use traditional lock-in amplifier in embodiment
It measures the A.C.power loss of the superconducting magnet respectively with measuring device provided by the utility model, and its result is compared.For
Meet the input voltage demand of lock-in amplifier, superconducting magnet the number of turns used in the present embodiment is the critical electricity of self-fields under 25,77K
Stream is 95A, and superconducting magnet is soaked in liquid nitrogen (77K) when measuring, and is measured using measuring device provided by the utility model
The A.C.power loss method of above-mentioned superconducting magnet is specific as follows:
(1) processing is input to by LabVIEW man-machine interface firstly the need of the parameter for needing data acquisition module operation
And display module, key parameter in the present embodiment are as follows: sample rate is set as 20000KS/s, and opening up memory headroom size is 20000
It is a, selection be data collecting card 0 channel and 1 channel, time interval is set as being passed through the period of superconducting magnet electric current, text
The input of part title is " shiyan ", and input signal maximum value and minimum value are set as positive and negative 5V, and current divider coefficient is 206.2；
(2) it controls power amplifier by signal generator to be exported, between the time in frequency 50Hz, namely (1)
Every being set as 20ms, the operation button of program is pressed after power amplifier output, internal calculation obtains the exchange damage of superconducting magnet
Consumption measurement result can be shown on window.
Power amplifier is controlled by signal generator and is gradually increased output electric current, and Measurement of Superconducting Magnet is in different operating
A.C.power loss under electric current compares the measurement result of traditional measurement method and the utility model measuring device, comparison diagram
As shown in Figure 4.It can be seen that the A.C.power loss of superconducting magnet with the increase of running current by the Comparative result in Fig. 4
Quickly increase, and the registration of the measurement result of measuring device provided by the utility model and traditional lock-in amplifier method is very
Height, illustrate the utility model proposes measuring device validity.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principle of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of device of Measurement of Superconducting Magnet A.C.power loss characterized by comprising power module, current divider R, first point
Piezoresistance R1, the second divider resistance R2, data acquisition module and processing and display module；
The power module, for providing power supply for described device；
The current divider R, for being connected in parallel on the both ends of the power module after connecting with superconducting magnet to be checked, to measure in route
Electric current；
The first divider resistance R1With the second divider resistance R2For being connected in parallel on the two of the superconducting magnet to be checked after series connection
End, with the total voltage at the superconducting magnet both ends to be checked be more than the data acquisition module maximum range voltage when, to institute
The total voltage for stating superconducting magnet to be checked carries out voltage division processing；
The first end of the data acquisition module is connect with the first end of the current divider R；The second of the data acquisition module
End is connect with the second end of the current divider R；The third end of the data acquisition module and the second divider resistance R2?
One end connection；4th end of the data acquisition module and the second divider resistance R2Second end connection, use difference
The voltage value at the both ends the current divider R and the magnet voltage value of the superconducting magnet to be checked are inputted institute respectively by the form of input
It states in two channels of the data collecting card of data acquisition module, to obtain the voltage signal and electric current of the superconducting magnet to be checked
Signal；
The processing and display module are connect with the data acquisition module, the institute for being transmitted according to the data acquisition module
The voltage signal and current signal for stating superconducting magnet to be checked obtain the gross energy variation of the superconducting magnet to be checkedAnd then the energy variation of the equivalent inductance of the superconducting magnet to be checked is subtracted by gross energy variationObtain the A.C.power loss of the superconducting magnet to be checkedAnd show measurement result；Wherein, τ is integral start time, and T is
Total mark duration, u (t) are the voltage of superconducting magnet to be checked, and i (t) is the electric current in route, and L is the inductance of superconducting magnet to be checked,
IaAnd IbFirst and last current value of the superconducting magnet respectively to be checked in period T.
2. the apparatus according to claim 1, which is characterized in that the power module includes: signal generator, power amplification
Device and protective resistance R3；
The signal generator is connect with the power amplifier, for controlling the output of the power amplifier, so that described
Power amplifier provides power supply for described device；
The protective resistance R3The both ends of the power amplifier are connected in parallel on, for protecting the power amplifier.
3. device according to claim 1 or 2, which is characterized in that it is described processing and display module include human-computer interaction circle
Face；
The human-computer interaction interface includes channel creation, sample rate setting, time interval input and the setting of current divider coefficient.
4. device according to claim 3, which is characterized in that the total voltage at the superconducting magnet both ends to be checked is more than institute
When stating the maximum range voltage of data acquisition module, the magnet voltage value of the superconducting magnet to be checked is the superconducting magnet to be checked
The total voltage value at both ends is in the second divider resistance R2The partial pressure value at both ends, the total voltage at the superconducting magnet both ends to be checked
When being not above the maximum range voltage of the data acquisition module, the magnet voltage value of the superconducting magnet to be checked be it is described to
Examine the total voltage value at superconducting magnet both ends.
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| CN110988488A (en) * | 2019-12-11 | 2020-04-10 | 广东电网有限责任公司 | High-temperature superconducting winding alternating current loss testing device |
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| CN110988488A (en) * | 2019-12-11 | 2020-04-10 | 广东电网有限责任公司 | High-temperature superconducting winding alternating current loss testing device |
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