CN201897633U - Superconducting magnet quench detection device based on active power - Google Patents
Superconducting magnet quench detection device based on active power Download PDFInfo
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- CN201897633U CN201897633U CN201020551342XU CN201020551342U CN201897633U CN 201897633 U CN201897633 U CN 201897633U CN 201020551342X U CN201020551342X U CN 201020551342XU CN 201020551342 U CN201020551342 U CN 201020551342U CN 201897633 U CN201897633 U CN 201897633U
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Abstract
The utility model discloses a superconducting magnet quench detection device based on active power, which comprises a first superconducting coil, a second superconducting coil, a voltage sensor circuit, a differential operational amplifier, an absolute value circuit, an analog multiplication circuit, a low pass filtering circuit, a comparison circuit, an output signal and the like; voltage on the superconducting coil passes through the voltage sensor circuit and is input to a differential operational amplification circuit, the differential operational amplification circuit obtains and amplifies the differential value of the input voltage signal, an output signal is K (u1-u2), an absolute value circuit obtains the absolute value of the output signal, and the active power detection P=(u1-u2)*i is realized through the analog multiplication circuit. The signal P passes through a low pass filter and the comparison circuit to convert the output signal into a high level or low level signal according to the detected P value; when the superconducting coil is not in quench state, the P value is smaller than a gate valve voltage, and the output signal is at high level; when the superconducting coil is in quench state, the P value is larger than the gate valve voltage, and the output signal is at low level; in this way, whether the superconducting is in the quench state or not can be judged according to the output signal.
Description
[technical field]
The utility model relates to a kind of superconducting magnet quench detection system and detection method based on photoacoustic technique, belongs to electrical technology field.
[background technology]
Since China's economy tell the development and the distribution unbalancedness of electric power resource, make China's electric system have the system of characteristics such as huge, complicated, interconnected.A series of challenge and problem occur thereupon.As: increase the cable transmission capacity, reduce grid loss, the complicacy of electric load, security issues become increasingly urgent for electrical network, to raising of the quality of power supply or the like.The combination of superconductor technology and power technology forms the superconducting power technology, can fundamentally tackle above-mentioned challenge, solve an above-mentioned difficult problem.Adopt the superconducting power technology, improve the transmission capacity of single-machine capacity and electrical network, reduce the loss of electrical network, the fault restriction short-circuit current, improve the security of electrical network and improve quality, the stability that improves Operation of Electric Systems and reliability, reduction electric pressure, the security that improves electrical network that the power system dynamic step response improves electric energy, reduce floor area and the cost of electrical network and the improvement cost of electrical network of electrical network, and make the realization of ultra-large electrical network become possibility.
The core of superconducting power technology is the stability design of superconducting magnet, and in a single day it considers mainly how to prevent that the normality district from appearring in superconductor, when perhaps the normality district occurring, how to manage to make the unlikely diffusion in normality district, and finally recovers the superconducting state operation.Because the quench of superconducting magnet is always from certain a bit, diffuse to avalanche type whole magnet rapidly, magnet damages the most at last.Therefore, Ling Min quench detection is necessary.
Quench detection for superconducting magnet had multiple exploration, comprised several different methods such as the temperature rise of cooling off medium, pressure, flow rate detection, voltage detecting, ultrasound examination.Temperature rise, the pressure of cooling medium, the variation of flow velocity must exist with ... the heat that produces on the magnet after the quench, exist one time lag problem; Ultrasonic Detection Method sensitivity is higher, all very sensitive to electric current and temperature variation, can amount of localized heat accumulation or insulation damages occur and observe the variation of transport function when as yet quench not taking place at hyperconductive cable, take certain measure that the quench loss is reduced to minimum in advance.But this method is disturbed by external electromagnetic field easily, and needs an additional cover ultrasound wave generation receiving trap, realizes difficulty at the scene.All there are the problem of noise in voltage detecting method and bridge circuit detection method.
[utility model content]
For overcoming the deficiencies in the prior art, the utility model provides a kind of superconducting magnet quench detection device based on active power, can well solve the problem that bridge circuit exists.It is suitable equally to the AC and DC circuit, and is not subjected to the influence of noise.
The superconducting magnet quench detection device based on active power that the utility model provides comprises first and second superconducting coils, voltage sensor circuit, differential operational amplifier, absolute value circuit, analog multiplication circuit, low-pass filter circuit, comparator circuit and output signal successively; Voltage on first and second superconducting coils as the defeated people of calculus of differences amplifying circuit, is got difference by the calculus of differences amplifying circuit to the voltage signal of input, and it is amplified behind the overvoltage sensor circuit, and the calculus of differences amplifying circuit is with output signal K (u
1-u
2) the input absolute value circuit, absolute value circuit is to output signal K (u
1-u
2) take absolute value, realize that through analog multiplication circuit active power detects P=K (u
1-u
2) * i, the size of K is determined by the concrete parameter in the circuit; According to the active power detection method after improving, additional second order Butterworth LPF, active power signal P is through low-pass filter and make it have the most smooth amplitude-frequency response in free transmission range, has steeper amplitude versus frequency characte near cutoff frequency; Comparator circuit is converted to high level or low level according to the size of detected P value with output signal, and when superconducting coil not during quench, the P value is less than family of power and influence's voltage, and output signal is a high level; When the superconducting coil quench, the P value is greater than family of power and influence's voltage, and output signal is a low level, just can judge whether quench of superconduction according to output signal like this.
The structure of described voltage sensor circuit is: be connected the first Hall voltage sensor after the series connection of first superconducting coil and first current-limiting resistance, the output of the first Hall voltage sensor is through the output terminal of the 3rd sample resistance connecting circuit, be connected the second Hall voltage sensor after the series connection of second superconducting coil and second current-limiting resistance, the output of the second Hall voltage sensor is through another output terminal of the 4th sample resistance connecting circuit, with the input end of this amount output terminal as the calculus of differences amplifying circuit.Through absolute value circuit, not only can obtain the voltage signal that is directly proportional with tested voltage, and can isolate the electromagnetic interference (EMI) in the input signal, improve accuracy of detection.
Differential amplifier circuit during block diagram is described and analog multiplication circuit constitute a difference and amplify and analog multiplication circuit, have realized modular design.In the utility model, the difference amplifier is selected accurate low-power consumption instrument amplifier INA128, R for use
5And R
6Be current-limiting resistance, R
7Be gain resistor, it is output as (1+5OK Ω/R
5) (u
1-u
2).Amplifier A1 and A2 form absolute value circuit, and the output signal of front stage circuits is taken absolute value, and this amplifier should be selected low-power consumption, high-speed integrated operational amplifier for use.Analog multiplier is selected precision height, integrated chip RC4200 that the linearity is good for use, and the electric current on the shunt that port Port1 is with superconducting coil is connected realizes that through analog multiplication circuit active power detects P=(u
1-u
2) * i.
Advantage of the present utility model and good effect:
The utility model provides a kind of novel detection device based on active power; this device can detect the each quench signal of superconducting magnet accurately, fast, in time; guarantee the action promptly and accurately of quench protection device, and then guaranteed the safe and stable operation of superconducting magnet.This device need not on every circle coil voltage sensor to be installed all, improved detection sensitivity, this device can be good at not being subjected to the influence of noise, can well be applied to ac and dc systems, when having overcome bridge circuit electric circuit inspection method and being used for alternating circuit, the shortcoming of outer meeting resistance loss of energy.This output signal can combine with digital signal processing (DSP) technology, through the timely action in software programming control protection loop, for superconducting magnet provides a cover real-time digital quench protection device fast.
[description of drawings]
Fig. 1 is a quench signal detection system block diagram of the present utility model.
The hardware block diagram that Fig. 2 combines with digital signal processing (DSP) technology for the utility model
Fig. 3 is a voltage sensor circuit of the present utility model.
Fig. 4 is that difference of the present utility model is amplified and analog multiplication circuit.
Fig. 5 is the active power detection method, wherein,
The schematic diagram of Fig. 5-1 active power detection method;
Fig. 5-2 is the active power detection method theory diagram after improving.
[embodiment]
Below in conjunction with accompanying drawing the utility model is described further:
The utility model as shown in Figure 1.Fig. 1 has provided quench signal detection system block diagram, and this system is made up of superconducting coil, voltage sensor circuit, differential operational amplifier, absolute value circuit, analog multiplication circuit, low-pass filter circuit, comparator circuit and output signal eight parts.Its course of work is: as the defeated people of calculus of differences amplifying circuit, this circuit is got difference to the voltage signal of input to the voltage on superconducting coil L1 and the L2, and can amplify it behind the overvoltage sensor circuit, and output signal is K (u
1-u
2), absolute value circuit takes absolute value to it, realizes that through analog multiplication circuit active power detects P=K (u
1-u
2) * i, the size of K is determined by the concrete parameter in the circuit.According to the active power detection method after improving, additional low-pass filter circuit is selected the second order Butterworth LPF for use, makes it have the most smooth amplitude-frequency response in free transmission range, has steeper amplitude versus frequency characte near cutoff frequency.Comparator circuit is converted to high level or low level according to the size of detected P value with output signal, and when superconducting coil not during quench, the P value is less than family of power and influence's voltage, and output signal is a high level; When the superconducting coil quench, the P value is greater than family of power and influence's voltage, and output signal is a low level, just can judge whether quench of superconduction according to output signal like this.
Fig. 3 is a voltage sensor circuit of the present utility model.L among the figure
1And L
2Be superconducting coil, R
1And R
2Be current-limiting resistance, R
3And R
4Be sample resistance, in order to obtain good linearty, U
1And U
2Adopt the Hall voltage sensor.Like this through buffer circuit, not only can obtain the voltage signal that is directly proportional with tested voltage, and can isolate the electromagnetic interference (EMI) in the input signal, improve accuracy of detection.
Fig. 4 is that difference of the present utility model is amplified and analog multiplication circuit.In the utility model, the difference amplifier is selected accurate low-power consumption instrument amplifier INA128, R for use
3And R
4Be current-limiting resistance, R
5Be gain resistor, it is output as (1+5OK Ω/R
5) (u
1-u
2).Amplifier A1 and A2 form absolute value circuit, and the output signal of front stage circuits is taken absolute value, and this amplifier should be selected low-power consumption, high-speed integrated operational amplifier for use.Analog multiplier is selected precision height, integrated chip RC4200 that the linearity is good for use, and the electric current on the shunt that port Port1 is with superconducting coil is connected realizes that through analog multiplication circuit active power detects P=(u
1-u
2) * i.
Fig. 2 is the hardware block diagram that the utility model combines with digital signal processing (DSP) technology.Adopted modular design idea, whole hardware unit is divided into quench signal supervisory instrument, digital-to-analog conversion and data processing module, phase-locked loop module, control module and interface module and forms.Wherein the signal condition module is made up of amplifying circuit and filtering circuit; Because selected dsp chip is powerful, therefore comprise that AD D/A converter module and data processing module have also comprised many Peripheral storage devices; Interface module mainly is made up of the control circuit of various peripheral interfaces; Phase-locked loop module and control module are the control circuits of elevator system performance.
The above as can be seen; the utility model is except detecting the quench signal of superconducting magnet accurately, fast, in time; guaranteed the timely action of quench protection device; thereby guarantee outside the safe and stable operation of superconducting magnet; can reflect the change in voltage situation after the superconducting magnet quench fully; electromagnetic interference (EMI) in the input signal is isolated, improve accuracy of detection.And this output signal can combine with digital signal processing (DSP) technology, through the timely action in software programming control protection loop, for superconducting magnetic energy storage provides a cover real-time digital quench protection device fast.
Claims (3)
1. the superconducting magnet quench detection device based on active power is characterized in that this device comprises first and second superconducting coils, voltage sensor circuit, differential operational amplifier, absolute value circuit, analog multiplication circuit, low-pass filter circuit, comparator circuit and output signal successively; Voltage on first and second superconducting coils behind the overvoltage sensor circuit as the defeated people of calculus of differences amplifying circuit, the calculus of differences amplifying circuit is imported absolute value circuit with output signal, the output signal of absolute value circuit is through analog multiplication circuit, low-pass filter circuit input comparator circuit, comparator circuit will judge superconduction whether the testing result of quench export as output signal.
2. the superconducting magnet quench detection device based on active power according to claim 1, the structure that it is characterized in that described voltage sensor circuit is: be connected the first Hall voltage sensor after the series connection of first superconducting coil and first current-limiting resistance, the output of the first Hall voltage sensor is through the output terminal of the 3rd sample resistance connecting circuit, be connected the second Hall voltage sensor after the series connection of second superconducting coil and second current-limiting resistance, the output of the second Hall voltage sensor is through another output terminal of the 4th sample resistance connecting circuit, with the input end of this two output terminal as the calculus of differences amplifying circuit.
3. the superconducting magnet quench detection device based on active power according to claim 1 is characterized in that described differential amplifier circuit and analog multiplication circuit constitute a difference and amplify and analog multiplication circuit, has realized modular design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020551342XU CN201897633U (en) | 2010-10-08 | 2010-10-08 | Superconducting magnet quench detection device based on active power |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020551342XU CN201897633U (en) | 2010-10-08 | 2010-10-08 | Superconducting magnet quench detection device based on active power |
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| Publication Number | Publication Date |
|---|---|
| CN201897633U true CN201897633U (en) | 2011-07-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501740A (en) * | 2016-09-22 | 2017-03-15 | 中国电力科学研究院 | A kind of superconducting magnet quenches detection method and device |
| CN109342504A (en) * | 2018-11-20 | 2019-02-15 | 中国电力科学研究院有限公司 | A kind of device and method for quenching recovery characteristics measuring superconducting tape |
| 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 |
-
2010
- 2010-10-08 CN CN201020551342XU patent/CN201897633U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501740A (en) * | 2016-09-22 | 2017-03-15 | 中国电力科学研究院 | A kind of superconducting magnet quenches detection method and device |
| CN109342504A (en) * | 2018-11-20 | 2019-02-15 | 中国电力科学研究院有限公司 | A kind of device and method for quenching recovery characteristics measuring superconducting tape |
| CN109342504B (en) * | 2018-11-20 | 2022-09-20 | 中国电力科学研究院有限公司 | Device and method for measuring quench recovery characteristic of superconducting tape |
| 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 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110713 |