CN115015825A - Device body unit, current rising device, temperature rise test system and temperature rise test method - Google Patents
Device body unit, current rising device, temperature rise test system and temperature rise test method Download PDFInfo
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- CN115015825A CN115015825A CN202210719503.9A CN202210719503A CN115015825A CN 115015825 A CN115015825 A CN 115015825A CN 202210719503 A CN202210719503 A CN 202210719503A CN 115015825 A CN115015825 A CN 115015825A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a body unit, a current rising device, a temperature rise measuring system and a temperature rise measuring method, wherein the body unit comprises four iron core elements, four coil elements, a primary current measuring element and an insulating element, the four iron core elements are arranged at intervals, and the magnetic flux density of the iron core elements is 1.2T; the coil elements and the iron core elements are arranged in a one-to-one correspondence mode, and the transformation ratio is 7200/10A; the primary current measuring element is arranged on the low-voltage side; the coil element and the primary current measuring element are sleeved on the insulating element; the voltage current within 20A below 3kV is applied to the low-voltage side, the primary current less than or equal to 6000A is generated at the high-voltage side, and the 350kV high voltage is isolated. The high-voltage transformer has the advantages that a miniaturized high-power 120kVA high-current transformer body capable of isolating 350kV is developed by utilizing a high-voltage transformer production technology; the device is miniaturized, economical and practical, the primary current output range is wide, namely 100-6000A, the primary high-voltage current can be measured simultaneously, and the precision can reach 0.2 level; the four transformers can be used in series and parallel connection, and the measurement requirements of the tested products with different current ratios and primary impedance are met.
Description
Technical Field
The invention relates to the technical field of temperature rise tests of high-voltage current transformers, in particular to a device body unit, a current rising device, a temperature rise test system and a temperature rise test method.
Background
The detection of the temperature rise performance of the current transformer is an important means for quality assurance of the transformer production, manufacturing, development and shaping, and is also a guarantee for ensuring the safe and stable operation of the transformer in a system. The temperature rise test is a type test project which must be done in national standard GB20840-2 and international standard IEC 61869-2.
The international most famous netherlands KEMA laboratory uses two large 550kV cable connectors and a section of 550kV cable, uses a large-structure iron core and a secondary coil, and uses a large voltage to realize high-voltage current rise, and the equipment occupies a large area, is very expensive and is not favorable for storage.
The national transformer quality inspection center laboratory of China utilizes the subordinate of a 1500kV transformer to boost voltage during cascading and simultaneously excites a voltage regulator and a large-current transformer with high voltage and large current, but the voltage regulator and the large-current transformer in the test loop are insulated by utilizing a post insulator and the ground, and are shielded by utilizing a Faraday cage principle by utilizing a metal shield outside, so that corona discharge is avoided, and the voltage regulator is controlled by utilizing optical fiber communication to adjust the large current once.
As can be seen from the above, temperature rise measuring equipment in international and domestic laboratories is very large in size, expensive and complex, and common transformer manufacturers do not have the condition. In addition, the testing costs of third party laboratories are also very expensive.
At present, no effective solution is provided for the problems of large equipment volume, complex structure, high cost, high detection cost and the like in the related technology.
Disclosure of Invention
The invention aims to provide a body unit and an electromagnetic voltage transformer aiming at the defects in the prior art, and aims to solve the problems of large equipment volume, complex structure, high cost, high detection cost and the like in the related art.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, a body unit is provided for a temperature rise test of a 550kV current transformer, comprising:
the four iron core elements are arranged at intervals, and the magnetic flux density of the iron core elements is 1.2T;
the four coil elements are arranged in one-to-one correspondence with the iron core elements, each coil element is sleeved with the corresponding iron core element, the four coil elements can be used in series and parallel connection, and the transformation ratio is 7200/10A;
a primary current measuring element provided on a low voltage side of the body unit and located on one side of the coil element;
the coil element and the primary current measuring element are sleeved with the insulating element;
the transformer body unit comprises a low-voltage side and a high-voltage side, voltage current within 20A below 3kV is applied to the low-voltage side, primary current less than or equal to 6000A is generated at the high-voltage side, and 350kV high voltage is isolated.
In a second aspect, a current rising device is provided for 550kV current transformer temperature rise test, comprising:
the body unit according to the first aspect;
the oil storage unit is sleeved on the body unit;
and the primary conductive unit penetrates through the oil storage unit and the body unit.
In some of these embodiments, the primary conductive element comprises:
a primary conductive rod element disposed through the oil storage unit and the body unit;
primary terminal elements respectively disposed at both ends of the primary conductive bar element.
In some of these embodiments, further comprising:
the anti-explosion unit is arranged at the upper part of the oil storage unit;
the porcelain bushing unit is sleeved on the body unit, and the top end of the porcelain bushing unit is detachably connected with the bottom end of the oil storage unit;
and the base unit is arranged at the bottom of the porcelain sleeve unit and is respectively connected with the porcelain sleeve unit and the body unit.
In a third aspect, a temperature rise test system is provided for temperature rise test of a 550kV current transformer, comprising:
the current rising device of the second aspect is connected with a 550kV current transformer and used for applying primary current less than or equal to 6000A to the 550kV current transformer;
the temperature measuring device is connected with the 550kV current transformer and used for detecting temperature rise data of the high-voltage side at different positions of the 550kV current transformer;
the secondary circuit resistance measuring device is connected with the 550kV current transformer and is used for measuring a resistance change curve of a secondary winding of the 550kV current transformer;
and the control device is respectively connected with the current rising device, the temperature measuring device and the secondary loop resistance measuring device, and is used for acquiring the temperature rise data of the high-voltage side and the resistance change curve of the secondary winding and calculating the temperature rise data of the secondary winding according to the resistance change curve of the secondary winding.
In some of these embodiments, the temperature measuring device comprises:
the temperature measuring unit is connected with the 550kV current transformer and is used for detecting the temperature rise data of the high-voltage side at different positions of the 550kV current transformer;
and the first control unit is respectively connected with the temperature measuring unit and the control device and used for acquiring the temperature rise data of the high-voltage side and transmitting the temperature rise data of the high-voltage side to the control device.
In some of these embodiments, the secondary loop resistance measurement device comprises:
the standard direct current power supply unit is connected with the 550kV current transformer and used for measuring secondary winding current data of the 550kV current transformer;
the multi-path voltage testing unit is connected with the 550kV current transformer and is used for measuring the voltage data of a secondary winding of the 550kV current transformer;
and the second control unit is respectively connected with the standard direct-current power supply unit, the multi-path voltage testing unit and the control device, and is used for acquiring the secondary winding current data and the secondary winding voltage data, calculating to acquire a secondary winding resistance change curve according to the secondary winding current data and the secondary winding voltage data, and transmitting the secondary winding resistance change curve to the control device.
In some of these embodiments, further comprising:
and the optical fiber transmission device is respectively connected with the temperature measuring device and the control device and is used for isolating the high voltage and transmitting the temperature rise data of the high voltage side to the control device.
In some embodiments, the method further comprises:
and the large-current connecting device is respectively connected with the current boosting device and the 550kV current transformer.
In a fourth aspect, a temperature rise test method is provided, wherein the temperature rise test system according to the second aspect is used for performing a temperature rise test on the 550kV current transformer.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
according to the body unit, the current rising device, the temperature rise test system and the temperature rise test method, a miniaturized high-power 120kVA high-current body capable of isolating 350kV is developed by utilizing a high-voltage transformer production technology; the device is miniaturized, economical and practical, the primary current output range is wide, namely 100-6000A, the primary high-voltage current can be measured simultaneously, and the precision can reach 0.2 level; the four transformers can be used in series and parallel connection, and the measurement requirements of the tested products with different current ratios and primary impedance are met.
Drawings
Fig. 1 is a schematic view of a body unit according to an embodiment of the present invention;
FIG. 2 is a schematic view of an upflow device in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a primary conductive element according to an embodiment of the present invention;
FIG. 4a is a schematic diagram of a temperature rise test system according to an embodiment of the present invention;
FIG. 4b is a schematic diagram of a temperature rise test method according to an embodiment of the present invention;
FIG. 5 is a schematic view of a temperature measurement device according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a secondary loop resistance measurement device according to an embodiment of the invention.
Wherein the reference numerals are: 100. an upflow device; 110. a body unit; 111. a core element; 112. a coil element; 113. a primary current measuring element; 114. an insulating member; 120. an oil storage unit; 130. a primary conductive unit; 131. a primary conductive rod element; 132. a primary terminal element; 140. an explosion-proof unit; 150. a porcelain bushing unit;
200. a temperature measuring device; 210. a temperature measuring unit; 220. a first control unit;
300. a secondary loop resistance measuring device; 310. a standard DC power supply unit; 320. a multi-path voltage test unit; 330. a second control unit;
400. and a control device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example 1
The present embodiment relates to a body unit of the present invention.
An exemplary embodiment of the present invention, as shown in fig. 1, a body unit 110 for a 550kV current transformer temperature rise test, includes a four-core element 111, a four-coil element 112, a primary current measuring element 113, and an insulating element 114. Wherein, four iron core elements 111 are arranged at intervals, and the magnetic flux density of the iron core elements 111 is 1.2T; the coil elements 112 and the iron core elements 111 are arranged in a one-to-one correspondence manner, each coil element 112 is sleeved with the corresponding iron core element 111, the four coil elements 112 can be used in series and parallel, and the transformation ratio is 7200/10A; the primary current measuring element 113 is provided on the low voltage side of the body unit 110 and on one side of the coil element 112; an insulating element 114 is provided around the coil element 112 and the primary current measuring element 113; the body unit 110 includes a low voltage side and a high voltage side, a voltage current within 20A below 3kV is applied to the low voltage side, a primary current less than or equal to 6000A is generated at the high voltage side, and 350kV high voltage is isolated.
The core element 111 is an M1H type core.
Wherein, an iron core element 111 and a coil element 112 form a transformer.
The primary current measuring element 113 is an 5000/1A0.2S measuring-level current transformer.
Wherein, the insulating element 114 is oiled paper insulation capable of isolating 350kV high voltage.
The primary current generated by the body unit 110 on the high-voltage side ranges from 100A to 6000A.
Wherein, the capacity of the body unit 110 is 120 kVA.
The invention has the following advantages:
1. the production technology of the high-voltage transformer is utilized to develop a miniaturized high-power 120kVA high-current transformer body capable of isolating 350 kV;
2. the device is miniaturized, economical and practical, the primary current output range is wide, namely 100-6000A, the primary high-voltage current can be measured simultaneously, and the precision can reach 0.2 level;
3. the four transformers can be used in series-parallel connection, and the measurement requirements of the tested products with different current ratios and primary impedance are met.
Example 2
The present embodiment relates to an upflow device of the present invention.
An exemplary embodiment of the present invention, as shown in fig. 2, is an apparatus 100 for temperature rise test of a 550kV current transformer, comprising a body unit 110, an oil storage unit 120 and a primary conductive unit 130 as described in embodiment 1. Wherein, the oil storage unit 120 is sleeved on the body unit 110; the primary conductive unit 130 is provided to penetrate the oil storage unit 120 and the body unit 110.
As shown in fig. 3, the primary conductive unit 130 includes a primary conductive rod member 131 and a primary terminal member 132. Wherein, the primary conductive rod member 131 is disposed to penetrate the oil storage unit 120 and the body unit 110; the primary terminal member 132, the primary terminal member 132 is disposed at both ends of the primary conductive bar member 131, respectively.
Further, the upflow device 100 further includes an explosion-proof unit 140, a porcelain bushing unit 150, and a base unit (not shown in the drawings). Wherein, the explosion-proof unit 140 is disposed at the upper portion of the oil storage unit 120; the porcelain bushing unit 150 is sleeved on the body unit 110, and the top end of the porcelain bushing unit is detachably connected with the bottom end of the oil storage unit 120; the base unit is disposed at the bottom of the porcelain bushing unit 150 and is connected to the porcelain bushing unit 150 and the body unit 110, respectively.
Specifically, the core element 111, the coil element 112, and the primary current measuring element 113 of the body unit 110 are disposed inside the oil reservoir unit 120; the insulating member 114 of the body unit 110 is disposed inside the oil storage unit 120 and the porcelain bushing unit 150; the outlet terminals of the four coil elements 112 of the body unit 110 are connected to the base unit.
Further, the current rising apparatus 100 further includes a secondary wiring unit. The secondary wiring unit is disposed at the bottom of the base unit and connected to the outlet terminal of the body unit 110.
The invention has the following advantages:
1. a high-voltage transformer production technology is utilized to develop a miniaturized high-power 120kVA high-current booster capable of isolating 350 kV;
2. miniaturization, economical and practical, wide primary current output range of 100-6000A, and capability of simultaneously measuring primary high-voltage current, wherein the precision can reach 0.2 level.
Example 3
This example relates to a temperature rise test system of the present invention.
An exemplary embodiment of the present invention, as shown in fig. 4a to 4b, is a temperature rise test system, which includes the current rising device 100, the temperature measuring device 200, the secondary loop resistance measuring device 300, and the control device 400 according to embodiment 2. The current rising device 100 is connected with a 550kV current transformer and is used for applying primary current less than or equal to 6000A to the 550kV current transformer; the temperature measuring device 200 is connected with the 550kV current transformer and used for detecting temperature rise data of the high-voltage side at different positions of the 550kV current transformer; the secondary circuit resistance measuring device 300 is connected with the 550kV current transformer and is used for measuring a resistance change curve of a secondary winding of the 550kV current transformer; the control device 400 is connected to the current rising device 100, the temperature measuring device 200, and the secondary circuit resistance measuring device 300, respectively, and is configured to obtain temperature rise data on the high-voltage side and a resistance variation curve of the secondary winding, and calculate temperature rise data of the secondary winding according to the resistance variation curve of the secondary winding.
As shown in fig. 5, the temperature measuring device 200 includes a temperature measuring unit 210 and a first control unit 220. The temperature measuring unit 210 is connected with the 550kV current transformer and used for detecting temperature rise data of the high-voltage side at different positions of the 550kV current transformer; the first control unit 220 is connected to the temperature measuring unit 210 and the control device 400, respectively, and is configured to obtain the high-side temperature rise data and transmit the high-side temperature rise data to the control device 400.
Specifically, the temperature measuring unit 210 is placed on top of the 550kV current transformer.
The temperature measuring unit 210 comprises a plurality of temperature measuring elements, and the plurality of temperature measuring elements are distributed on the top of the 550kV current transformer, so that the temperatures of different positions on the top of the 550kV current transformer are obtained.
In some of these embodiments, the temperature measuring element is a thermocouple.
The first control unit 220 converts the high-side temperature rise data transmitted by the temperature measuring unit 210 to obtain a digital quantity of the high-side temperature rise data, and then transmits the digital quantity to the control device 400.
As shown in fig. 6, the secondary loop resistance measuring device 300 includes a standard dc power supply unit 310, a multi-path voltage testing unit 320, and a second control unit 330. The standard direct-current power supply unit 310 is connected with a 550kV current transformer and used for measuring secondary winding current data of the 550kV current transformer; the multi-path voltage testing unit 320 is connected with the 550kV current transformer and used for measuring the voltage data of a secondary winding of the 550kV current transformer; the second control unit 330 is connected to the standard dc power supply unit 310, the multi-path voltage testing unit 320, and the control device 400, and is configured to obtain secondary winding current data and secondary winding voltage data, calculate a secondary winding resistance variation curve according to the secondary winding current data and the secondary winding voltage data, and transmit the secondary winding resistance variation curve to the control device 400.
The standard dc power supply unit 310 and the multi-path voltage testing unit 320 can simultaneously measure data related to a plurality of secondary windings.
Further, the temperature rise test system also comprises an optical fiber transmission device. The optical fiber transmission device is respectively connected with the temperature measuring device 200 and the control device 400, and is used for isolating high voltage and transmitting temperature rise data of the high voltage side to the control device 400.
Specifically, the optical fiber transmission device is connected to the first control unit 220 and the control device 400, respectively.
Further, the temperature rise test system also comprises a large-current connecting device. And the large-current connecting device is respectively connected with the current rising device 100 and the 550kV current transformer.
Wherein, the large-current connecting device is a copper bar.
The invention has the advantages that:
1. the temperature rise test requirement of the 550kV current transformer with the rated current reaching 5000A and below is met;
2. the temperature rise of the mutual inductor can be measured under high voltage, and the temperature rise condition of the secondary winding can be calculated and measured according to a resistance method;
3. the temperature measuring points are multiple, 20 groups of temperature data can be measured at the same time of high voltage, and real-time transmission is carried out;
4. the temperature data of the high-voltage position is transmitted to the measuring system by using the optical fiber, the temperature of a measuring point is observed remotely in a telescope or spectrometer mode with high safety, reliability and precision, and special equipment or a special loop is not needed to apply large current to a tested product under a high-voltage electric field.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a body unit for 550kV current transformer temperature rise test, its characterized in that includes:
the four iron core elements are arranged at intervals, and the magnetic flux density of the iron core elements is 1.2T;
the four coil elements are arranged in one-to-one correspondence with the iron core elements, each coil element is sleeved with the corresponding iron core element, the four coil elements can be used in series and parallel connection, and the transformation ratio is 7200/10A;
a primary current measuring element provided on a low voltage side of the body unit and located on one side of the coil element;
the coil element and the primary current measuring element are sleeved with the insulating element;
the transformer body unit comprises a low-voltage side and a high-voltage side, voltage current within 20A below 3kV is applied to the low-voltage side, primary current less than or equal to 6000A is generated at the high-voltage side, and 350kV high voltage is isolated.
2. The utility model provides a rise and flow the device for 550kV current transformer temperature rise test, its characterized in that includes:
the body unit of claim 1;
the oil storage unit is sleeved on the body unit;
and the primary conductive unit penetrates through the oil storage unit and the body unit.
3. An upflow device as in claim 2, in which the primary conductive element comprises:
a primary conductive rod element disposed through the oil storage unit and the body unit;
primary terminal elements respectively disposed at both ends of the primary conductive bar element.
4. An upflow device as in claim 2 or 3, further comprising:
the anti-explosion unit is arranged at the upper part of the oil storage unit;
the porcelain bushing unit is sleeved on the body unit, and the top end of the porcelain bushing unit is detachably connected with the bottom end of the oil storage unit;
and the base unit is arranged at the bottom of the porcelain bushing unit and is respectively connected with the porcelain bushing unit and the body unit.
5. The utility model provides a temperature rise test system for 550kV current transformer temperature rise test, its characterized in that includes:
the current rising device as claimed in any one of claims 2 to 4, connected with a 550kV current transformer, and used for applying a primary current of 6000A or less to the 550kV current transformer;
the temperature measuring device is connected with the 550kV current transformer and used for detecting temperature rise data of the high-voltage side at different positions of the 550kV current transformer;
the secondary circuit resistance measuring device is connected with the 550kV current transformer and is used for measuring a resistance change curve of a secondary winding of the 550kV current transformer;
and the control device is respectively connected with the current rising device, the temperature measuring device and the secondary loop resistance measuring device, and is used for acquiring the temperature rise data of the high-voltage side and the resistance change curve of the secondary winding and calculating the temperature rise data of the secondary winding according to the resistance change curve of the secondary winding.
6. The temperature-rise test system of claim 5, wherein the temperature measuring device comprises:
the temperature measuring unit is connected with the 550kV current transformer and is used for detecting the temperature rise data of the high-voltage side at different positions of the 550kV current transformer;
and the first control unit is respectively connected with the temperature measuring unit and the control device and used for acquiring the temperature rise data of the high-voltage side and transmitting the temperature rise data of the high-voltage side to the control device.
7. The temperature-rise test system of claim 5, wherein the secondary loop resistance measurement device comprises:
the standard direct current power supply unit is connected with the 550kV current transformer and used for measuring secondary winding current data of the 550kV current transformer;
the multi-path voltage testing unit is connected with the 550kV current transformer and is used for measuring the voltage data of a secondary winding of the 550kV current transformer;
and the second control unit is respectively connected with the standard direct-current power supply unit, the multi-path voltage testing unit and the control device, and is used for acquiring the secondary winding current data and the secondary winding voltage data, calculating to acquire a secondary winding resistance change curve according to the secondary winding current data and the secondary winding voltage data, and transmitting the secondary winding resistance change curve to the control device.
8. The temperature rise test system of claim 5, further comprising:
and the optical fiber transmission device is respectively connected with the temperature measuring device and the control device and is used for isolating the high voltage and transmitting the temperature rise data of the high voltage side to the control device.
9. The temperature-rise test system of claim 5, further comprising:
and the large-current connecting device is respectively connected with the current boosting device and the 550kV current transformer.
10. A temperature rise test method, which adopts the temperature rise test system as claimed in any one of claims 5-9, and is used for carrying out temperature rise test on a 550kV current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210719503.9A CN115015825A (en) | 2022-06-23 | 2022-06-23 | Device body unit, current rising device, temperature rise test system and temperature rise test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210719503.9A CN115015825A (en) | 2022-06-23 | 2022-06-23 | Device body unit, current rising device, temperature rise test system and temperature rise test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115015825A true CN115015825A (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210719503.9A Pending CN115015825A (en) | 2022-06-23 | 2022-06-23 | Device body unit, current rising device, temperature rise test system and temperature rise test method |
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| CN (1) | CN115015825A (en) |
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2022
- 2022-06-23 CN CN202210719503.9A patent/CN115015825A/en active Pending
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