CN107478938B - Resistive DC current limiter, and system and method for testing resistive DC current limiter - Google Patents
Resistive DC current limiter, and system and method for testing resistive DC current limiter Download PDFInfo
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- CN107478938B CN107478938B CN201710900867.6A CN201710900867A CN107478938B CN 107478938 B CN107478938 B CN 107478938B CN 201710900867 A CN201710900867 A CN 201710900867A CN 107478938 B CN107478938 B CN 107478938B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- H—ELECTRICITY
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Abstract
The invention provides a resistive direct current limiter, a testing system and a testing method of the resistive direct current limiter, wherein the resistive direct current limiter is made of YBCO double-sided films in a superconducting film, and the application of the resistive direct current limiter in the direct current field is satisfied. Meanwhile, a test system for testing the resistive direct current limiter is provided, which comprises a first direct current power supply, a second direct current power supply, a first switch, a second switch, a third switch, a measuring container and an electric signal measuring device, and a test method applied to the test system of the resistive direct current limiter, so as to realize the tests of the current limiting and the resistance change rule of the resistive direct current limiter.
Description
Technical Field
The invention relates to the technical field of resistive superconducting current limiters, in particular to a resistive direct current limiter, a testing system and a testing method of the resistive direct current limiter.
Background
In the power grid, an increase in instantaneous current caused by a short circuit of the system is an important problem jeopardizing the safe operation thereof. With the rapid price reduction of high-temperature superconducting materials, popularization and application of superconducting technology and rapid development of related researches in recent years, the resistive superconducting current limiter is used for realizing fault current limiting, and a new scheme is provided for solving the problem of short circuit current limiting of a power grid.
The current materials for manufacturing the resistive superconducting current limiter mainly comprise a high-temperature superconducting block, a high-temperature superconducting strip, a high-temperature superconducting film and the like, and the resistive current limiter based on the high-temperature superconducting film has the current-carrying performance with ultralow loss and the rapid and effective current-limiting characteristic, and has the unique advantages of small volume, light weight, high response speed when short-circuit faults occur, large generation resistance and short quench recovery time compared with other resistive superconducting current limiters. However, the conventional resistive superconducting dc current limiter is manufactured by using a high-temperature superconducting tape, and the resistive superconducting current limiter based on the high-temperature superconducting film is limited to an ac current limiter, and lacks of research on the resistive dc current limiter based on the high-temperature superconducting film and the resistive dc current limiter based on the high-temperature superconducting film.
Disclosure of Invention
Based on this, it is necessary to provide a resistive dc current limiter, a test system and a test method for the resistive dc current limiter, for the lack of the resistive dc current limiter based on the high temperature superconducting thin film and for the study of the resistive dc current limiter based on the high temperature superconducting thin film.
The technical scheme provided by the invention is as follows:
a resistive DC current limiter comprises one or more YBCO (Yttrium Barium Copper Oxide yttrium barium copper oxide) double-sided film structures, a first electrode and a second electrode.
The YBCO double-sided film comprises a substrate, a first YBCO film arranged on one surface of the substrate and a second YBCO film arranged on the other surface of the substrate; wherein the substrate is LaAlO 3 (lanthanum aluminate) substrate.
The YBCO double-sided film also comprises CeO arranged between the substrate and the first YBCO film and the second YBCO film 2 (ceria) layer.
The YBCO double-sided film further includes Au (gold) layers disposed on the first YBCO film and the second YBCO film.
The first electrode is connected with the first end of the Au layer of each first YBCO film, the second end of the Au layer of each first YBCO film is connected with the second end of the Au layer of the second YBCO film on the same YBCO double-sided film, and the first end of the Au layer of the second YBCO film is connected with the second electrode.
A test system for testing the resistive dc current limiter, comprising:
the device comprises a first switch, a second switch, a third switch, a measuring container and an electric signal measuring device.
The measuring container comprises a measuring container body, a third electrode and a fourth electrode, wherein the third electrode and the fourth electrode are used for respectively connecting two poles of a resistance type direct current limiter arranged in the measuring container body; the two poles of the resistive direct current limiter are a first electrode and a second electrode.
The electric signal measuring device is used for measuring the voltage and the current of the resistance type direct current limiter in the measuring container body respectively.
The first switch, the second switch, the third electrode and the fourth electrode are used for being connected with the first direct current power supply in series to form a first loop.
The two ends of the second switch are used for being respectively connected with the two ends of the load.
The second direct current power supply, the third switch, the third electrode and the fourth electrode are used for being connected with the second direct current power supply in series to form a second loop.
A testing method of a resistance type direct current limiter is applied to the testing system of the resistance type direct current limiter, and comprises the following steps:
and switching on the first switch within a first preset time threshold, switching off the second switch and the third switch, and acquiring first voltage information and first current information of the resistive direct current limiter measured by the electric signal measuring device within the first preset time threshold.
And switching on the first switch and the second switch within a second preset time threshold after the first preset time threshold, and switching off the third switch. And acquiring second voltage information and second current information of the resistive direct current limiter measured by the electric signal measuring device within a second preset time threshold.
And turning off the first switch and the second switch at the end time of the second preset time threshold, and turning on the third switch at the preset time after the second preset time threshold. And acquiring third voltage information at two ends of the resistive direct current limiter from the end of the second preset time threshold value, and obtaining time required for the third voltage information to become zero.
The invention provides a resistive direct current limiter made of YBCO double-sided films in a high-temperature superconducting film, which meets the application of the resistive direct current limiter in the field of direct current. The test system comprises a first direct current power supply, a second direct current power supply, a first switch, a second switch, a third switch, a measuring container and an electric signal measuring device, and a test method applied to the test system of the resistance type direct current limiter, so that the tests of current limiting, resistance change rules and the like of the resistance type direct current limiter are realized.
Drawings
FIG. 1 is a circuit diagram of a resistive DC current limiter;
FIG. 2 is a YBCO double-sided film diagram;
FIG. 3 is a serpentine trace;
FIG. 4 is an operational circuit of a test system of a resistive DC current limiter;
fig. 5 is a flow chart of a test method of the resistive dc current limiter.
Detailed Description
For a better understanding of the objects, technical solutions and technical effects of the present invention, the present invention will be further explained below with reference to the drawings and examples. Meanwhile, it is stated that the embodiments described below are only for explaining the present invention and are not intended to limit the present invention.
In one embodiment, a resistive direct current limiter is provided that includes one or more YBCO double-sided films, a first electrode, and a second electrode.
The YBCO double-sided film comprises a substrate, a first YBCO film arranged on one surface of the substrate and a second YBCO film arranged on the other surface of the substrate; wherein the substrate is LaAlO 3 A substrate.
The YBCO double-sided film also comprises CeO arranged between the substrate and the first YBCO film and between the substrate and the second YBCO film 2 A layer.
The YBCO double-sided film further includes Au layers disposed on the first YBCO film and the second YBCO film.
The first electrode is connected with the first end of the Au layer of each first YBCO film, the second end of the Au layer of each first YBCO film is connected with the second end of the Au layer of the second YBCO film on the same YBCO double-sided film, and the first end of the Au layer of the second YBCO film is connected with the second electrode. The current direction from the first end to the second end of the first YBCO film and the Au layer on the film is opposite to the current direction from the first end to the second end of the second YBCO film and the Au layer on the film.
The second end of the Au layer of the first YBCO film is connected with the second end of the Au layer of the second YBCO film on the same YBCO double-sided film, so that the front side and the back side of the YBCO double-sided film are connected in series, and according to heat transfer between the first YBCO film and the second YBCO film of the YBCO double-sided film, the first YBCO film and the second YBCO film have the same temperature, and the quench synchronism of the first YBCO film and the second YBCO film is ensured. Meanwhile, the first YBCO film and the second YBCO film which are connected in series on two sides of the YBCO double-sided film can increase the current limiting resistance.
As shown in FIG. 1, a circuit diagram of the operation of a resistive DC current limiter is shown, wherein R is as follows SCAn And R is SCBn And respectively representing the resistances generated by the quench of the two sides of the first YBCO film and the second YBCO film of the n-th YBCO double-sided film.
The YBCO double-sided film structure of the embodiment is disposed in a liquid nitrogen temperature region.
The YBCO double-sided film with the double-sided film structure absorbs more heat, the temperature is easier to rise, so that the quench of the film superconducting layer and the resistance rise of the metal layer are quickened, the resistance value of the generated resistor is increased, the sensitivity to short-circuit current is higher, and the current limiting effect of the resistive direct current limiter is improved.
As shown in FIG. 2, the film is a YBCO double-sided film comprising a surface Au layer 10, a YBCO layer 11 and LaAlO 3 The substrate 12 and the YBCO layer 11 are deposited on two sides, and CeO with a relatively thin interval is conveniently deposited between the two 2 The Au layer 10 is then plated on the surface of the layer, and the connection electrode of the Au layer 10 on one or more of these multilayer thin film structures constitutes a YBCO double-sided thin film based resistive dc current limiter.
Substrate selection LaAlO of YBCO double-sided film 3 The substrate 12 provides a resistive dc current transformer with good thermal conductivity and is easy to manufacture. Due to LaAlO 3 It is difficult to deposit a YBCO film directly on the substrate 12, thus in LaAlO 3 Introducing a buffer layer CeO between the substrate 12 and YBCO 2 The two are separated to improve the preparation effect of the YBCO double-sided film. Meanwhile, a metal Au layer 10 is plated on the YBCO film to serve as a shunt resistor, so that the stability and the conductivity of the resistive direct current device are improved.
The embodiment provides a resistive direct current limiter based on a YBCO double-sided film in a high-temperature superconducting film, which meets the application of the resistive direct current limiter in the direct current field.
Optionally, the thickness of the Au layer 10 on the surface of the YBCO double-sided film is 50-100nm, the thickness of the YBCO layer 11 is 300-500nm, and CeO 2 Layer thickness 50nm, laAlO 3 The substrate 12 has a thickness of 0.5mm. Preferably, the thickness of the Au layer 10 on the surface of the YBCO double-sided film is 100nm, the thickness of the YBCO layer 11 is 300nm, and CeO 2 Layer thickness 50nm, laAlO 3 The substrate 12 has a thickness of 0.5mm to enhance the current limiting effect of the resistive dc current limiter.
Optionally, as shown in FIG. 3, the Au layer is a Au etching layer of the serpentine trace except the film LaAlO 3 Each layer outside the substrate is a serpentine trace etching layer.
Correspondingly, the YBCO layer also samples the same serpentine trace pattern as the Au layer.
The YBCO layers on the front side and the back side of the same YBCO double-sided film are the same as the Au layer conductive patterns, and projections of the conductive patterns on the front side and the back side are completely overlapped in the vertical direction. The YBCO layer and the Au layer of the snakelike wiring conductive pattern are selected, so that the wiring length of the YBCO layer and the Au layer is increased, and the current limiting resistance of the resistive direct current limiter is increased to the greatest extent.
Optionally, the first electrode is connected to a first end of the Au layer on each first YBCO film, a second end of the Au layer on the first YBCO film is connected to a second end of the Au layer on a second YBCO film of the same YBCO double-sided film, and the first end of the Au layer on the second YBCO film is connected to the second electrode. The first end and the second end of the Au layer are two ends of the snake-shaped wiring respectively.
The current direction from the first end to the second end of the Au layer on the first YBCO film is opposite to the current direction from the first end to the second end of the Au layer on the second YBCO film, so that a reverse current carrying mode on the YBCO double-sided film is realized, the magnetic field in the local direction of the YBCO film is prevented from being too strong, the current carrying capacity of the YBCO film during normal current passing is ensured, meanwhile, the overall inductance of a circuit is reduced, and the response speed of the circuit during normal current passing is improved.
Optionally, the first YBCO film and the second YBCO film are rectangular YBCO films, so that the conductive patterns are convenient to process, and waste of film material corners is reduced.
In one embodiment, a system for testing a resistive dc current limiter is provided, which is configured to test the resistive dc current limiter according to any one of the above embodiments, and includes:
the device comprises a first switch, a second switch, a third switch, a measuring container and an electric signal measuring device.
The measuring container comprises a measuring container body, a third electrode and a fourth electrode, wherein the third electrode and the fourth electrode are used for respectively connecting two poles of a resistance type direct current limiter arranged in the measuring container body. The two poles of the resistive direct current limiter are a first electrode and a second electrode.
The measuring container is a liquid nitrogen container to provide a liquid nitrogen working environment of the resistive direct current limiter.
The electric signal measuring device is used for measuring the voltage and the current of the resistance type direct current limiter in the measuring container body respectively.
The voltage of the resistive direct current limiter can be measured through voltmeters connected in parallel to the two ends of the resistive direct current limiter, and the current of the resistive direct current limiter can be measured through ammeter connected in series to the two ends of the resistive direct current limiter. Preferably, a oscillograph is used as an electric signal measuring device, so that waveform changes of voltage and current at two ends of the resistance type direct current limiter can be recorded conveniently, and the voltage and current changes of the resistance type direct current limiter are reflected intuitively.
The first switch, the second switch, the third electrode and the fourth electrode are used for being connected with the first direct current power supply in series to form a first loop.
The two ends of the second switch are used for being respectively connected with the two ends of the load.
The second direct current power supply, the third switch, the third electrode and the fourth electrode are used for being connected with the second direct current power supply in series to form a second loop.
The first direct current power supply is used for conducting short circuit experimental test on the resistive direct current limiter. Optionally, a direct current voltage source with an output voltage of 10-400V being adjustable, a rated current of 50A and an instantaneous peak current of 75A is selected as the first direct current power supply.
The second direct current power supply is a direct current source for supplying power in the quench recovery time test. Optionally, a direct current source with an output current of 20mA and a rated voltage of 12V is selected as the second direct current power supply.
The load is determined according to the output voltage of the direct-current voltage source, and a resistor with a resistance value of 5 omega is selected as the load in order to ensure that the current passing through the YBCO film under the non-short circuit condition is lower than the critical current.
Optionally, the test system of the resistive direct current limiter further comprises a protection resistor, and the protection resistor is connected in series in the first loop. The protection resistor is a resistor with a resistance value of 0.2 omega and is used for limiting the rising speed and the peak value of the short-circuit current.
For the sake of understanding, the present embodiment is explained below by the working circuit of the test system of the resistive dc current limiter, which is illustrated in fig. 4, and includes a first switch S1, a second switch S2, and a third switch S3, and a measuring container LN2 path for multiplying and discharging liquid nitrogen, and the electric signal measuring device is replaced with a voltmeter and an ammeter for the sake of understanding. Wherein the first direct current power supply is DC1, the second direct current power supply is DC2, and the load resistance is R load The protection resistance is R 0 。
The embodiment provides a test system of a resistance type direct current limiter so as to realize accurate and rapid test of quench and resistance current limiting rules of the resistance type direct current limiter. The embodiment aims at the test system of the small-capacity current limiter, and the test of the large-capacity current limiter is performed to increase the capacity of devices such as a power supply
In one embodiment, as shown in fig. 5, a flowchart of a testing method of a resistive dc current limiter is shown, and the testing system applied to the resistive dc current limiter in any of the above embodiments includes the steps of:
s101, turning on a first switch in a first preset time threshold, turning off a second switch and a third switch, and obtaining first voltage information and first current information of the resistive direct current limiter measured by the electric signal measuring device in the first preset time threshold.
Optionally, the first preset time threshold is 20ms, so as to ensure that the current in the conducting loop is smaller than the critical current of the YBCO double-sided film, and the YBCO double-sided film is in a superconducting state.
S102, the first switch and the second switch are turned on and the third switch is turned off within a second preset time threshold after the first preset time threshold. And acquiring second voltage information and second current information of the resistive direct current limiter measured by the electric signal measuring device within a second preset time threshold.
Optionally, the second preset time threshold is 5ms, so that after the S2 is conducted and the load is shorted, the current in the loop can rapidly exceed the critical current of the YBCO double-sided film, and the YBCO double-sided film is quenched.
And S103, turning off the first switch and the second switch at the end moment of the second preset time threshold, turning on the third switch at the preset moment after the second preset time threshold, and obtaining third voltage information at two ends of the resistive direct current limiter from the end of the second preset time threshold to obtain the time required for the third voltage information to become zero voltage.
After the YBCO double-sided film is quenched, the first switch and the second switch are turned off, and the third switch is turned on, so that the YBCO double-sided film is quenched and recovered. And obtaining the time required for the voltage at the two ends of the film to be changed to zero again by measuring the change condition of the voltage at the two ends of the film, and obtaining the quench recovery time.
The electric signal measuring device is used for measuring the change of voltage and current at two ends of the film, and the resistance change rule is obtained by combining the first voltage information, the first current information, the second voltage information, the second current information and the third voltage information and is used for reflecting the current limiting effect of the resistance type direct current limiter.
The embodiment provides a testing method of a resistive direct current limiter, based on the testing system of the resistive direct current limiter, various working states of the resistive direct current limiter are obtained by controlling the on and off of each switch, so that the testing of quench and resistance current limiting rules and the like of the resistive direct current limiter is realized.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The resistive direct current limiter is characterized by comprising one or more YBCO double-sided films, a first electrode and a second electrode;
the YBCO double-sided film comprises a substrate, a first YBCO film arranged on one surface of the substrate and a second YBCO film arranged on the other surface of the substrate; wherein the substrate is LaAlO 3 A substrate;
the YBCO double-sided film also comprises CeO arranged between the substrate and the first YBCO film and between the substrate and the second YBCO film 2 A layer;
the YBCO double-sided film also comprises Au layers arranged on the first YBCO film and the second YBCO film;
the first electrode is connected with the first end of the Au layer of each first YBCO film, the second end of the Au layer of each first YBCO film is connected with the second end of the Au layer of the second YBCO film on the same YBCO double-sided film, and the first end of the Au layer of the second YBCO film is connected with the second electrode;
the first electrodes are connected with the first ends of the Au layers on the first YBCO films, the second ends of the Au layers on the first YBCO films are connected with the second ends of the Au layers on the second YBCO films of the same YBCO double-sided film, and the first ends of the Au layers on the second YBCO films are connected with the second electrodes;
the current direction from the first end to the second end of the Au layer on the first YBCO film is opposite to the current direction from the first end to the second end of the Au layer on the second YBCO film;
the first YBCO film and the second YBCO film are rectangular YBCO films.
2. The resistive direct current limiter according to claim 1, wherein the Au layer has a thickness of 50-100nm, the ybco thin film has a thickness of 300-500nm, ceo 2 Layer thickness of 50nm, laAlO 3 The substrate thickness was 0.5 a mm a.
3. The resistive direct current limiter of claim 1, wherein the thin film LaAlO is eliminated 3 Each layer outside the substrate is a serpentine trace pattern etching layer.
4. A system for testing a resistive dc current limiter according to any one of claims 1 to 3, comprising:
the device comprises a first switch, a second switch, a third switch, a measuring container and an electric signal measuring device;
the measuring container comprises a measuring container body, a third electrode and a fourth electrode, wherein the third electrode and the fourth electrode are used for respectively connecting two poles of a resistive direct current limiter arranged in the measuring container body; wherein, the two poles of the resistance type direct current limiter are the first electrode and the second electrode;
the electric signal measuring device is used for respectively measuring the voltage and the current of the resistance type direct current limiter in the measuring container body;
the first switch, the second switch, the third electrode and the fourth electrode are used for being connected with a first direct current power supply in series to form a first loop;
the two ends of the second switch are used for being connected with the two ends of the load respectively;
the first direct current power supply, the third switch, the third electrode and the fourth electrode are used for being connected with a second direct current power supply in series to form a second loop.
5. The system of claim 4, wherein the measurement vessel is a liquid nitrogen vessel.
6. The system of claim 4, wherein the electrical signal measuring device is a oscillograph.
7. The system of claim 4, further comprising a protection resistor in series with the first loop.
8. A test method of a resistive dc current limiter, applied to a test system of a resistive dc current limiter according to any one of claims 4 to 7, comprising the steps of:
the first switch is turned on within a first preset time threshold, the second switch and the third switch are turned off, and first voltage information and first current information of the resistive direct current limiter measured by the electric signal measuring device within the first preset time threshold are obtained;
the first switch and the second switch are turned on within a second preset time threshold after the first preset time threshold, the third switch is turned off, and second voltage information and second current information of the resistive direct current limiter measured by the electric signal measuring device within the second preset time threshold are obtained;
and turning off the first switch and the second switch at the end time of the second preset time threshold, turning on the third switch at the preset time after the second preset time threshold, and obtaining third voltage information of the resistive direct current limiter from the end of the second preset time threshold to obtain the time required for the third voltage information to become zero voltage.
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|---|---|---|---|---|
| JPH08223790A (en) * | 1995-02-08 | 1996-08-30 | Toshiba Corp | Superconducting current limiter |
| JP2009049257A (en) * | 2007-08-22 | 2009-03-05 | National Institute Of Advanced Industrial & Technology | Superconducting current-limiting element |
| CN202930433U (en) * | 2012-11-02 | 2013-05-08 | 西南交通大学 | Superconductive current limiter unit module with double-sided YBCO film structure |
| CN105160047A (en) * | 2015-04-27 | 2015-12-16 | 国家电网公司 | Resistive-type superconducting fault current limiter digital modeling and simulation method based on YBCO superconducting tape |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08223790A (en) * | 1995-02-08 | 1996-08-30 | Toshiba Corp | Superconducting current limiter |
| JP2009049257A (en) * | 2007-08-22 | 2009-03-05 | National Institute Of Advanced Industrial & Technology | Superconducting current-limiting element |
| CN202930433U (en) * | 2012-11-02 | 2013-05-08 | 西南交通大学 | Superconductive current limiter unit module with double-sided YBCO film structure |
| CN105160047A (en) * | 2015-04-27 | 2015-12-16 | 国家电网公司 | Resistive-type superconducting fault current limiter digital modeling and simulation method based on YBCO superconducting tape |
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