A coil quench detection device based on active power method

Abstract

The present invention provides a superconducting coil quench detection device based on the active power method. The voltage and current acquisition units provided in the coil under test collect the real-time voltage and current results of the coil, the power results of the superconducting coil are obtained in real time through the power metering unit, and the operating status of the superconducting power equipment is detected through a visual display screen. Compared with other detection methods, this method has the advantages of being fast, accurate, and intuitive. At the same time, the detection device has good anti-interference ability and the potential for design and modification in combination with the application object. Since the information of voltage, current and power is integrated by using a combination of multiple sensors, the quench position can be accurately located on the basis of improving the accuracy of quench detection, which is suitable for promotion and application in occasions with high detection speed and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting power devices, and in particular to a quench detection device and a detection method for a high-temperature superconducting coil operating under alternating current conditions. Background Art

[0002] With the widespread application of power equipment such as superconducting transformers, motors, energy storage magnets and maglev trains in industrial production and rail transportation, the power supply system not only requires the power equipment to have efficient production capacity, but also places high demands on its stable operation performance.

[0003] However, superconducting coils can easily lose their superconductivity when subjected to fault voltage, current or temperature rise shocks. When any parameter of the temperature, magnetic field and current at a certain point in the superconducting coil exceeds the critical value of the superconducting state, the superconducting coil will undergo a phase change and lose its superconducting state.

[0004] After the superconducting tape is quenched, a normal zone will appear. At this time, the current is shunted through the base layer and the stable layer, and resistance appears in the superconducting coil. When a large current flows through the resistor, it will generate losses and be transmitted horizontally and vertically at the quench point in the form of heat, thereby inducing the entire coil to quench, causing the coil to burn out or even insulation breakdown, or reducing its critical current to damage the superconducting device, and even affect the reliability of the power system. Therefore, it is of great significance to quickly and accurately detect the state of the coil quench.

[0005] At present, common quench detection methods include temperature rise detection, pressure signal detection, flow rate signal detection, voltage signal detection, grating fiber detection and active power detection, etc. They are based on the phenomenon that the superconducting device produces a sharp temperature rise after the quench, the liquid nitrogen evaporates under the action of heat, causing the pressure in the dewar to increase, and the flow rate of liquid nitrogen or nitrogen gas changes as the quench judgment criteria, but these passive and delayed quench judgments cannot timely and accurately reflect the quench state of the coil and strip. Summary of the invention

[0006] The embodiment of the present invention provides a coil quench detection device based on an active power method, which is used to solve the problems existing in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme.

[0008] A coil quench detection device based on an active power method comprises a cascaded power acquisition module, a quench detection module, and a display alarm module;

[0009] The power acquisition module is used to: acquire instantaneous values ​​of voltage and current of the superconducting coil, calculate the active power value of the superconducting coil based on the acquired instantaneous values ​​of voltage and current of the superconducting coil, and send the active power value to the quench detection module; the quench detection module is used to: compare the received active power value with a preset threshold value, and if the active power value is greater than the preset threshold value, send a quench instruction to the display alarm module; the display alarm module is used to: based on the received quench instruction, display the quench position and power result of the output superconducting coil, and output an alarm signal.

[0010] Preferably, the power acquisition module includes a voltage acquisition unit, a current acquisition unit, a voltage and current transformer unit and a power metering unit; the voltage acquisition unit and the current acquisition unit are used to respectively acquire the instantaneous value of the voltage at both ends of the superconducting coil and the instantaneous value of the current in the superconducting coil; the voltage and current transformer unit is used to convert the instantaneous value of the voltage at both ends of the superconducting coil and the instantaneous value of the current in the superconducting coil, and then input them into the power metering unit;

[0011] The power metering unit includes an active power calculation unit and a voltage-frequency conversion unit, and is used to calculate and obtain the active power value based on the received instantaneous value of the voltage across the superconducting coil and the instantaneous value of the current in the superconducting coil after conversion.

[0012] Preferably, the work power calculation unit obtains two voltage acquisition values ​​and one current acquisition value based on the instantaneous value of the voltage across the superconducting coil after conversion, and calculates the load power value based on the two voltage acquisition values ​​and one current acquisition value; the voltage-frequency conversion unit converts the load power value into a square wave pulse of a corresponding frequency and transmits it to the quench detection module.

[0013] Preferably, the power metering unit comprises a first MCU, and the first MCU is used for:

[0014] The received square wave pulse is converted and calculated to obtain the active power value;

[0015] The quench detection module includes a second MCU, which is used for:

[0016] The active power value is compared with a preset threshold value, and if the active power value is greater than the preset threshold value, the fault position information of the superconducting coil is obtained based on the active power value;

[0017] A quench instruction is generated based on the active power value and the superconducting coil fault location information and sent to the display alarm module.

[0018] Preferably, the received square wave pulse is converted and calculated to obtain the active power value through the formula

[0019]

[0020] Calculated; where P ref is the reference load power, f ref is the pulse frequency of the reference load, P is the power of the load to be measured, and F is the pulse frequency output by the pin of the first MCU corresponding to the load.

[0021] Preferably, the quench detection module further includes an active low-pass filtering unit, which is used to perform low-pass filtering on the received square wave pulses and then transmit them to the second MCU.

[0022] Preferably, the display alarm module comprises an alarm and a display screen; the display screen is used to display the quench position and power result of the output superconducting coil based on the received quench instruction, and the alarm is used to output an alarm signal based on the received quench instruction.

[0023] It can be seen from the technical solutions provided by the embodiments of the present invention that the present invention provides a superconducting coil quench detection device based on the active power method, which collects the real-time voltage and current results of the coil through the voltage and current acquisition unit set in the measured coil, obtains the power results of the superconducting coil in real time through the power metering unit 14, and detects the operating status of the superconducting power equipment through the visual display screen. Compared with other detection methods, this method has the advantages of being fast, accurate, and intuitive. At the same time, the detection device has good anti-interference ability and the potential for design and modification in combination with the application object. Since the information of voltage, current and power is integrated by using a combination of multiple sensors, the quench position can be accurately located on the basis of improving the accuracy of quench detection, which is suitable for promotion and application in occasions with high detection speed and accuracy.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 A logic block diagram of a coil quench detection device based on an active power method provided by the present invention;

[0027] Figure 2 A functional schematic diagram of a coil quench detection device based on an active power method provided by the present invention;

[0028] Figure 3A schematic diagram of a coil circuit based on an active power method in an embodiment of a coil quench detection device based on an active power method provided by the present invention;

[0029] Figure 4 It is a schematic diagram of a superconducting coil in a quench state to be measured;

[0030] Figure 5 A voltage and current unit measurement method for a coil quench detection device based on an active power method provided by the present invention Figure 4 Equivalent distribution diagram of voltage and current of superconducting coil;

[0031] Figure 6 A circuit diagram of a first MCU of a coil quench detection device based on an active power method provided by the present invention;

[0032] Figure 7 A chip function schematic diagram of a first MCU of a coil quench detection device based on an active power method provided by the present invention;

[0033] Figure 8 A schematic diagram of a square wave signal output by a power metering chip of a coil quench detection device based on an active power method provided by the present invention.

[0034] In the figure:

[0035] 1. Power acquisition module 11. Voltage acquisition unit 12. Current acquisition unit 13. Voltage and current transformer unit 14. Power metering unit 141. Power calculation unit 142. Voltage-frequency conversion unit;

[0036] 2. Quench detection module 21. Active low-pass filter unit 22. Embedded MCU processing unit;

[0037] 3. Display the alarm module. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0039] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0040] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0041] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0042] See also Figure 1 The present invention provides a coil quench detection device based on an active power method, comprising a cascaded power acquisition module 1, a quench detection module 2 and a display alarm module 3.

[0043] The power acquisition module 1 is used to acquire the instantaneous values ​​of the voltage and current of the superconducting coil, calculate the active power value of the superconducting coil based on the acquired instantaneous values ​​of the voltage and current of the superconducting coil, and send the active power value to the quench detection module; the quench detection module 2 is used to compare the received active power value with a preset threshold value, and if the active power value is greater than the preset threshold value, send a quench instruction to the display alarm module; the display alarm module 3 is used to display the quench position and power result of the output superconducting coil based on the received quench instruction, and output an alarm signal.

[0044] The main principle of the device provided by the present invention is as follows:

[0045] When a part of a high-temperature superconducting coil is quenched due to a fault current or temperature rise, resistance will appear in the quenched part of the coil. Therefore, by detecting the appearance of resistance, it can be determined that the coil is in a quenched state. Figure 1As shown, the voltage across the mutually induced superconducting coils is the sum of the voltage on the quench resistor, the coil self-inductance voltage and the coil mutual inductance voltage, and the coil end voltage is the superposition of the resistor voltage and the induction coil voltage.

[0046] The voltage drop of the quench resistor in the coil is smaller than the induced voltage, so it is difficult to determine whether the coil has quench resistor based on the voltage change at both ends of the coil. Therefore, it is necessary to eliminate the influence of the induced voltage in the coil, extract the resistive voltage part for judgment, and then judge the quench state based on whether resistance is generated. When the coil is quenched, the voltage is very small and the current in the coil is very large. It is difficult to achieve measurement accuracy by directly measuring the voltage result and it is easy to introduce interference that is much larger than the voltage signal. Therefore, the voltage measurement values ​​at different positions can be multiplied by the same loop current to achieve the amplification of the voltage characteristics, that is, the size of the resistor voltage is reflected by the power measurement value.

[0047] For example Figure 3 As shown in , the structure of the superconducting magnet or coil can be simplified by a circuit diagram. Coil 1 and coil 2 are two mutually inductive superconducting coils, whose inductances are L1 and L2 respectively, and the mutual inductance between the two is M. The currents flowing through coils 1 and 2 are i1 and i2, and i1=i2=i. The voltages Vrc1 and Vrc2 of the two coils are formed by the superposition of their own self-inductance voltages, mutual inductance voltages and resistance voltages. The power acquisition module is used to measure the instantaneous value of the voltage at both ends of the coil and the instantaneous value of the current flowing through the coil. The voltage and current data are collected in real time by evenly setting voltage and current sensor units on the coil. The results are processed by the power metering chip and converted into active power containing only resistive components. When the active power is greater than zero, it means that the resistance consumes power. The coil is generated by the quench resistor. By observing whether the active power is zero, it can be judged whether the superconducting coil generates the quench resistor, and then the quench state of the coil is determined.

[0048] Further Figure 4 As shown, the voltage measurement unit is U i1 and U i2 The voltage measurement unit can be set at both ends of a length of coil to measure the voltage value at both ends of the coil. The current measurement unit is I i , whose function is to measure the current at a certain point in the coil. Figure 5 The circuit structure shown is Figure 4 The equivalent structure of the superconducting coil shown in the figure. The superconducting coil is an equivalent inductor when it is not quenched (i.e. it is still a superconductor and has the characteristic of zero resistance of superconducting materials when working). When the coil has a quench fault, a resistance value will appear in the coil. The value of the resistance is related to the degree of quench propagation. At this time, the equivalent model of the coil is a combination of a coil and a resistor in series. Figure 5 Middle U 21 , U 31 , U 41 , U 51 ………Ui1 For the corresponding Figure 4 The 2nd, 3rd, 4th, 5th…ith measurement unit. I1, I2, I3, I4 are the currents at different positions of the coil, and R1, R2, R3, R4 are the resistances at different positions of the coil. OP is the current across the coil.

[0049] In the embodiment provided by the present invention, a chip for power metering is provided in the power acquisition module, and the collected instantaneous values ​​of voltage and current are converted and calculated into a square wave signal output with a certain frequency, and the frequency of the square wave is proportional to the active power value of the superconducting coil.

[0050] Specifically, in a preferred embodiment of the present invention, the power collection module 1 includes a voltage collection unit 11 , a current collection unit 12 , a voltage and current transformer 13 and a power metering unit 14 .

[0051] The voltage and current sensors of the voltage acquisition unit 11 and the current acquisition unit 12 are connected by leads and evenly arranged at different positions of the coil, and are used to collect the voltage at both ends of the superconducting coil and the current in the coil.

[0052] Voltage and current sensors can be set inside and outside the uninsulated coil. The contact point between the sensor and the coil should be as small as possible to prevent the coil layer spacing from being too large, causing the strip to bend and destroying the coil structure.

[0053] In the preferred embodiment provided by the present invention, the voltage and current transformer unit 13 is used to electrically isolate the large voltage and current input by the superconducting coil collected on the primary side from the power metering unit 14, convert the large current input on the primary side into a standard secondary current that can be input by the power metering chip, and convert the large voltage input on the primary side into a standard secondary voltage that can be input by the power metering chip, ensuring that the chip will not be burned due to excessive input, thereby providing safety protection for the stable operation of the power collection module.

[0054] The power metering unit includes an active power calculation unit and a voltage-frequency conversion unit. The instantaneous values ​​of voltage and current collected by the voltage collection unit 11 and the current collection unit 12 are converted by the voltage and current transformer unit 13 and finally input into the active power calculation unit 141 and the voltage-frequency conversion unit 142 to be converted into effective values ​​and calculate the active power. The output result is the active power, thereby eliminating the inductive voltage and retaining only the resistive part.

[0055] In a preferred embodiment provided by the present invention, the power metering unit includes a first MCU, and the first MCU is used for:

[0056] The received square wave pulses are converted to obtain the active power value.

[0057] The quench detection module includes a second MCU, which is used for:

[0058] The active power value is compared with a preset threshold value, and if the active power value is greater than the preset threshold value, the fault position information of the superconducting coil is obtained based on the active power value;

[0059] A quench instruction is generated based on the active power value and the superconducting coil fault location information and sent to the display alarm module.

[0060] In some preferred embodiments, the first MCU can be a commercially available product, such as HLW8012, whose circuit configuration is as follows: Figure 6 and 7 When the current input channel and the voltage input channel are given an AC signal, the CF and CF1 pins of HLW8012 will output corresponding square wave signals, and the frequency of the square wave is linearly related to the size of the input signal.

[0061] like Figure 6 In the circuit structure shown, the VIP and VIN pins in the first MCU U8 are used to input the instantaneous value of the current of the superconducting coil, the V2P pin is used to input the instantaneous value of the voltage of the superconducting coil, the CF and CF1 pins will output corresponding square wave signals, the SEL pin is used to select the CF1 input current / voltage value, and the VDD pin is used to connect to the power supply.

[0062] One side of the SEL pin is connected to a 5V power supply through a 40th resistor R40, and also has a control circuit, including a third transistor Q3. A 63rd capacitor C63, a 35th resistor R35 and a 37th resistor R37, wherein the collector of the third transistor Q3 is connected between the SEL pin and the 40th resistor R40, the base is connected to the 63rd capacitor C63 and the 35th resistor R35 in parallel, and the emitter is grounded. One end of the 37th resistor R37 is connected to the 63rd capacitor C63 and the 35th resistor R35 in parallel, and the other end is connected to the control port part.

[0063] The CF1 pin and the CF pin respectively output corresponding square wave signals through the rectifier circuit, and the rectifier circuit includes: a forty-third resistor R43, one end of which is connected to the CF1 pin, and the other end is connected to the output end PWM3_V / I of the current and voltage square wave signal; a nineteenth resistor R49, one end of which is connected to the CF pin, and the other end is connected to the output end PWM3_P of the power square wave signal; a sixtieth resistor R60, one end of which is connected between R43 and PWM3_V / I; a fifty-ninth resistor R59, one end of which is connected between R49 and PWM3_P, and the other end is connected in parallel with R60 and then grounded.

[0064] The V2P pin has a voltage input circuit, which includes a voltage transformer T3 (preferably TR3121 type) as a component for obtaining the superconducting coil voltage. Its two IN pins 2 and 3 are used to access the two ends (L3 and L4) of the superconducting coil. The 3rd pin is also provided with a 39th resistor R39 and a 47th resistor R47 connected in parallel. The two OUT pins (1 and 4) of the voltage transformer T3 are also provided with a voltage stabilizing circuit, which includes a 55th resistor R55, a 56th resistor R56, a 48th resistor R48 and a 69th capacitor C69.

[0065] The VIP pin side has a fifty-second capacitor C52 and a fifty-third capacitor C53 connected in parallel, the VIN pin side has a fifty-fourth capacitor C54 and a fifty-fifth capacitor C55 connected in parallel, and the VDD pin side has a forty-ninth capacitor C49, a fiftieth capacitor C50 and a fifty-first capacitor C51 connected in parallel, which serve as filtering circuits respectively.

[0066] The active power value is calculated as follows:

[0067] The period of the pulse frequency output by the CF pin of the power metering chip represents the power value P. The greater the power, the greater the pulse frequency output by the CF pin, and the change is proportional. That is: The active power calculation formula is obtained from this

[0068]

[0069] Where P ref : Reference load power is a given known power. ref : The pulse frequency of the reference load, the actual measured value for the selected CPU. P: The power of the load to be tested. F: The pulse frequency of the load corresponding to the CF pin output.

[0070] The pulse frequency F is calculated as follows:

[0071] The frequency output by the CF pin of the power metering module is between 0-2KHz, and the corresponding minimum period is 0.5ms. If a 50us timer is used to measure the pulse period, the error of a pulse period of more than 5ms can be basically ignored, but when measuring a pulse period of less than 5ms, the error will become larger and larger, even reaching 10% (pulse period 0.5ms). Considering the relationship between measurement accuracy and measurement time, a segmented measurement method is adopted in this embodiment.

[0072] Two external interrupt port software measurement methods: When the measured pulse period is greater than or equal to 100ms, the method of measuring a single period is adopted, and the measurement error = 1ms / T. Because T>100ms, the measurement error is less than 1%; when the measured pulse period is less than 100ms, the counting pulse measurement method is adopted in this embodiment, such as Figure 8 As shown, within a time period of t greater than or equal to 1S, N complete pulse cycles are measured, and the calculation formula is as follows:

[0073] t = N*T, F = 1 / t (2).

[0074] Specifically, the second MCU processing unit 22 is used to provide a quench detection main program and a serial port interrupt service subroutine, configure the GPIO port of the embedded MCU according to the hardware circuit, initialize peripherals such as the display screen and the alarm, compare and judge the active power result input by the power acquisition module with the preset threshold, and control the LED light to flash and trigger a warning when it is judged to be a quench state.

[0075] The embedded MCU processing unit includes but is not limited to embedded processing systems such as ARM series processors, digital signal processors DSP and F series single-chip microcomputers. Designers in this field can choose or modify within the scope of the claims, which does not affect the essential content of the present invention.

[0076] In the embodiment provided by the present invention, the superconducting coil includes any one of the second-generation high-temperature superconducting materials NbTi, NbSn3, MgB2, BSCCO, ReBCO, GdBCO, and YBCO.

[0077] In order to intuitively and accurately detect the quench state of the coil, a multi-channel power acquisition module 1 can be set to collect the coil power results. The voltage and current acquisition units can be arranged along a central axis of the coil, or they can be evenly distributed on the coil. Multiple coil measurement points can reflect the changing rules of voltage, current and power at different positions of the superconducting coil. When a part of it quenches, its quench state can be effectively observed by comparing the parts. Preferably, more measurement points should be arranged at the ends and welding points of the coil where quenching is prone to occur during actual design analysis. The measured coil can be in the form of single-turn or multi-turn winding.

[0078] Furthermore, in some improved embodiments, the quench detection module 2 further includes an active low-pass filtering unit 21 for performing low-pass filtering on the power signal output by the power collection unit 1, which can effectively reduce noise, useless and interference signals and achieve a frequency selection function.

[0079] For example, Figure 2In one embodiment shown, the voltage acquisition unit 11 and the current acquisition unit 12 are evenly arranged on the superconducting coil to sample the terminal voltage of each part of the coil and the current in the coil when the current is flowing under AC working conditions. The collected voltage and current results are isolated, reduced in voltage and current through the voltage and current transformer unit 13 and input into the power acquisition unit 14. The power metering unit 14 converts the collected instantaneous values ​​of voltage and current into effective values ​​through analog-to-digital conversion and calculates the active power through the active power calculation unit 141 and the voltage-frequency conversion unit 142, and the output result is the active power, thereby eliminating the inductive voltage and retaining only the resistive part. The power metering unit 14 converts the sampled current and voltage characteristics through analog-to-digital conversion and power-frequency converter into a square wave pulse number equivalent to the active power and inputs it into the quench detection module 2, and the low-pass filter unit 21 filters the input power and selects the signal with a low signal-to-noise ratio. The embedded MCU processing unit 22 compares and analyzes the obtained power result with the preset threshold voltage result. When the power value is less than the preset power when there is no timeout, and when the power value is greater than the preset power when there is timeout, the embedded MCU processing unit 22 compares the power results sampled from various parts of the coil. When the power collected by the acquisition unit is greater than the threshold power of the normal part of the coil, the occurrence of the quench state and the location of the faulty part can be determined.

[0080] In the preferred embodiment provided by the present invention, the display alarm module 3 is a peripheral device of the embedded MCU processing unit 22, and works under the call of the interrupt service subroutine. When the quench detection module detects the quench state of the coil, the display alarm module 3 responds to the interrupt and sends a warning signal.

[0081] Specifically, the display alarm module 3 is provided with a buzzer / alarm light and an LCD display screen / digital tube. The display screen displays the real-time power result and displays the position of the corresponding quenched part at the quench moment. The alarm sends an alarm signal under the interruption action to achieve the effect of sound and light warning.

[0082] The present invention also provides an embodiment for exemplarily showing the use process of the coil quench detection device based on the active power method provided by the present invention.

[0083] Power collection module distribution step: the power collection units are evenly arranged between the turns of the high-temperature superconducting coil, or arranged in an equidistant distribution manner along the central axis;

[0084] Each power collection module includes two voltage sensors and one current sensor. The voltage sensors are arranged on adjacent single-layer or multi-layer coils to collect coil terminal voltages, and the current sensors are arranged on the coils to collect loop currents.

[0085] Specific quench judgment steps: Arrange the power collection unit at equal distances in the superconducting coil in advance, sample the terminal voltage of each part of the coil and the current in the coil when the current is flowing under AC conditions, and convert it into active power results through the power metering unit. Compare and analyze the power results of each output. When a quench occurs, compare the power results sampled from each part of the coil. If the power collected by the power collection unit on the quenched part of the coil is greater than the preset threshold of the normal part of the coil, it can be judged that a quench has occurred.

[0086] Preferably, when the power detection characteristic of any part of the coil exceeds a set threshold, it is considered that the coil voltage has changed.

[0087] In summary, the present invention provides a superconducting coil quench detection device based on the active power method, which collects the real-time voltage and current results of the coil through the voltage and current acquisition unit set in the measured coil, obtains the power result of the superconducting coil in real time through the power metering unit 14, and detects the operating status of the superconducting power device through a visual display screen. Compared with other detection methods, this method has the advantages of being fast, accurate, and intuitive. At the same time, the detection device has good anti-interference ability and the potential for design and modification in combination with the application object. Since the information of voltage, current and power is integrated by using a combination of multiple sensors, the quench position can be accurately located on the basis of improving the accuracy of quench detection, which is suitable for promotion and application in occasions with high detection speed and accuracy.

[0088] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0089] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention or certain parts of the embodiments.

[0090] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0091] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A coil quench detection device based on active power method, characterized in that: It includes a cascaded power acquisition module, a quench detection module, and a display alarm module; The power acquisition module is used to: collect instantaneous values ​​of voltage and current of the superconducting coil, calculate the active power value of the superconducting coil based on the collected instantaneous values ​​of voltage and current of the superconducting coil, and send the active power value to the quench detection module; the quench detection module is used to: compare the received active power value with a preset threshold value, and if the active power value is greater than the preset threshold value, send a quench instruction to the display alarm module; the display alarm module is used to: based on the received quench instruction, display the quench position and power result of the output superconducting coil, and output an alarm signal; The power acquisition module includes a voltage acquisition unit, a current acquisition unit, a voltage and current transformer unit and a power metering unit; the voltage acquisition unit and the current acquisition unit are used to respectively acquire the instantaneous value of the voltage at both ends of the superconducting coil and the instantaneous value of the current in the superconducting coil; the voltage and current transformer unit is used to convert the instantaneous value of the voltage at both ends of the superconducting coil and the instantaneous value of the current in the superconducting coil, and then input them into the power metering unit; The power metering unit includes an active power calculation unit and a voltage-frequency conversion unit, which is used to calculate and obtain the active power value based on the received instantaneous value of the voltage across the superconducting coil and the instantaneous value of the current in the superconducting coil after conversion; The active power calculation unit obtains two voltage acquisition values ​​and one current acquisition value based on the instantaneous value of the voltage at both ends of the superconducting coil after conversion, and calculates the load power value based on the two voltage acquisition values ​​and one current acquisition value; the voltage-frequency conversion unit converts the load power value into a square wave pulse of a corresponding frequency and transmits it to the quench detection module.

2. The device according to claim 1, characterized in that The power metering unit includes a first MCU, and the first MCU is used for: Converting and calculating the received square wave pulse to obtain the active power value; The quench detection module includes a second MCU, and the second MCU is used for: Comparing the active power value with a preset threshold, and if the active power value is greater than the preset threshold, obtaining superconducting coil fault location information based on the active power value; The quench instruction is generated based on the active power value and the superconducting coil fault position information, and is sent to the alarm display module.

3. The device according to claim 2, characterized in that The received square wave pulse is converted and calculated to obtain the active power value through the formula Calculated; where P ref is the reference load power, f ref is the pulse frequency of the reference load, P is the power of the load to be measured, and F is the pulse frequency output by the pin of the first MCU corresponding to the load.

4. The device according to claim 3, characterized in that The quench detection module also includes an active low-pass filtering unit, which is used to perform low-pass filtering on the received square wave pulses and then transmit them to the second MCU.

5. The device according to claim 1, characterized in that The display alarm module includes an alarm and a display screen; the display screen is used to display the quench position and power result of the output superconducting coil based on the received quench instruction, and the alarm is used to output an alarm signal based on the received quench instruction.

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