CN115702464A - Gas-insulated transformer, gas-insulated transformer system, and voltage estimation method - Google Patents
Gas-insulated transformer, gas-insulated transformer system, and voltage estimation method Download PDFInfo
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- CN115702464A CN115702464A CN202080102331.XA CN202080102331A CN115702464A CN 115702464 A CN115702464 A CN 115702464A CN 202080102331 A CN202080102331 A CN 202080102331A CN 115702464 A CN115702464 A CN 115702464A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/10—Single-phase transformers
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Abstract
The invention provides a gas-insulated transformer capable of estimating primary voltage with high precision. The transformer includes: a core; a secondary winding (12) wound around the core; a primary winding (11) wound around the outer periphery of the secondary winding coaxially with the secondary winding; a high-voltage shield cover (13) covering the outer periphery of the primary winding; a low voltage shield (14) facing the high voltage shield; a ground terminal (23); and a capacitor (21) having one end connected to the low-voltage shield and the other end connected to the ground terminal.
Description
Technical Field
The present invention relates to a gas-insulated transformer, a gas-insulated transformer system, and a method for estimating a voltage of a primary winding in the gas-insulated transformer and the gas-insulated transformer system.
Background
There is known a gas-insulated transformer which is connected to a bus or a line of a substation or the like to change a voltage and supply the voltage. An example of such a gas-insulated transformer is disclosed in patent document 1.
Documents of the prior art
Patent literature
Patent document 1: japanese laid-open patent publication No. 2004-22557 "
Disclosure of Invention
Problems to be solved by the invention
In a power system to which the gas-insulated transformer is applied, it is desirable to detect a primary voltage supplied to the gas-insulated transformer. In addition, when it is desired to detect the primary voltage, it is desirable to avoid unnecessarily complicating and enlarging the structure of the apparatus. It is desirable to detect the primary voltage without causing an error due to a change in a load connected to the secondary side.
An object of one embodiment of the present invention is to provide a gas-insulated transformer or the like capable of detecting a primary voltage without unnecessarily complicating and enlarging the structure of the apparatus or generating an error due to a change in a load connected to a secondary side.
Means for solving the problems
In order to solve the above problem, a gas-insulated transformer according to an embodiment of the present invention includes: a core; a secondary winding wound around the core; a primary winding wound outside an outer periphery of the secondary winding coaxially with the secondary winding; a high voltage shield cover covering an outer circumference of the primary winding; the low-voltage shielding cover is opposite to the high-voltage shielding cover; a ground terminal; and a circuit element having one end connected to the low-voltage shield case and the other end connected to the ground terminal.
Further, a voltage estimation method according to an embodiment of the present invention is a voltage estimation method for estimating a primary voltage of a gas-insulated transformer, the gas-insulated transformer including: a core; a secondary winding wound around the core; a primary winding wound outside an outer periphery of the secondary winding coaxially with the secondary winding; a high voltage shield cover covering the outer periphery of the primary winding; the low-voltage shielding cover is opposite to the high-voltage shielding cover; a ground terminal; and a circuit element having one end connected to the low-voltage shield case and the other end connected to the ground terminal, the voltage estimation method including: detecting a voltage applied to the circuit element; and estimating a primary voltage based on an electrostatic capacitance between the high-voltage shield case and the low-voltage shield case, a circuit constant of the circuit element, and a voltage applied to the circuit element.
ADVANTAGEOUS EFFECTS OF INVENTION
The gas-insulated transformer according to an embodiment of the present invention can detect a voltage applied to the primary winding without unnecessarily complicating and enlarging the structure of the apparatus or without causing an error due to a change in a load connected to the secondary side.
Drawings
Fig. 1 is a diagram showing a configuration of a gas insulated transformer system according to embodiment 1.
Fig. 2 is a cross-sectional view taken along line X-X in fig. 1.
Fig. 3 is a cross-sectional view taken along line Y-Y in fig. 2.
Fig. 4 is a circuit diagram showing a circuit configuration of a transformer according to embodiment 1.
Fig. 5 is a block diagram showing a configuration of a main part of the primary voltage estimating apparatus.
Fig. 6 is a flowchart showing a process of estimating the primary voltage by the primary voltage estimation device.
Detailed Description
[ embodiment 1 ]
Hereinafter, an embodiment of the present invention will be described in detail.
(Structure of gas insulated transformer system 100)
Fig. 1 is a diagram showing a configuration of a gas insulated transformer system 100 according to embodiment 1. As shown in fig. 1, the gas-insulated transformer system 100 includes a transformer 1 (gas-insulated transformer) and a primary voltage estimation device 9. Fig. 2 and 3 show cross sections of main members disposed inside the container 31 of the transformer 1 at specific cut positions.
Fig. 2 shows a cross section on the X-X line in fig. 1. Fig. 3 shows a cross section on the line Y-Y in fig. 2. Such a gas-insulated transformer system 100 is installed in a power generation station or a power substation for the purpose of converting high-voltage power and supplying the converted power as internal power, for example. Fig. 4 is a circuit diagram showing a schematic configuration of the circuit of the transformer 1.
(Structure of Transformer 1)
The transformer 1 is a single-phase grounding type transformer. The transformer 1 includes a core 10, a primary winding 11, a secondary winding 12, a high-voltage shield case 13, a low-voltage shield case 14, a lead connecting portion 16, a capacitor 21 (circuit element), a voltage detection terminal 22, a ground terminal 23, a voltage detector 24, a container 31, and a terminal box 32.
The core 10 is a core material on which the primary winding 11 and the secondary winding 12 are wound. The core 10 is formed of a material containing a magnetic body. In embodiment 1, the core 10 is formed of iron. The secondary winding 12 is wound around the core 10. The primary winding 11 is wound around the outer periphery of the secondary winding 12 coaxially with the secondary winding 12.
In the transformer 1, a primary voltage V1 is input to input terminals (terminals U and V in the circuit diagram of fig. 4) of the primary winding 11, and a secondary voltage corresponding to a turn ratio of the primary winding 11 to the secondary winding 12 is output from output terminals (terminals U and V in the circuit diagram of fig. 4) of the secondary winding 12. The turn ratio of the primary winding 11 and the secondary winding 12 may be determined as appropriate according to the ratio of the required primary voltage V1 to the secondary voltage.
The high-voltage shield 13 covers the outer periphery of the primary winding 11. The high-voltage shield 13 reduces the influence of an electric field generated by applying the primary voltage V1 supplied from a bus, a line, or the like of a substation to the primary winding 11. The low-voltage shield 14 is disposed at a position facing the high-voltage shield 13. Specifically, the low-voltage shield 14 is disposed between the high-voltage shield 13 and the region of the core 10 not covering the secondary winding 12.
The low-voltage shield 14 is provided at the above-described position, thereby reducing the influence of the edge of the core 10, the fixing member of the core 10, and other members on the electric field formed by the primary winding 11. The axial direction of the secondary winding 12 is longer than the axial direction of the primary winding 11. Therefore, in the transformer 1, the secondary winding 12 also functions as a shield cover to reduce the influence of the edge of the core 10, the fixing member of the core 10, and other members on the electric field formed by the primary winding 11.
The high-voltage shield 13 and the low-voltage shield 14 are each formed of a conductor. The high-voltage shield 13 and the low-voltage shield 14 are not connected to each other by a conductor. Since the low-voltage shield 14 is provided at a position facing the high-voltage shield 13, the transformer 1 has a capacitance C1 between the high-voltage shield 13 and the low-voltage shield 14. In the following description, it is considered that the high-voltage shield 13 and the low-voltage shield 14 are connected to each other via the dummy capacitor 15 having the electrostatic capacitance C1.
The lead connection portion 16 is a member that connects the lead 12a of the secondary winding 12. As shown in fig. 1, in the transformer 1, the low-voltage shield 14 is disposed between the high-voltage shield 13 and the lead connection portion 16. Therefore, the low-voltage shield 14 also reduces the influence of the lead connection portion 16 on the electric field formed by the primary winding 11.
The capacitor 21 is a circuit element having one end connected to the low-voltage shield 14 and the other end connected to the ground terminal 23. The ground terminal 23 is a terminal for grounding the capacitor 21. Therefore, the potential of the low-voltage shield 14 is in a state of floating from the ground potential by the amount of the voltage applied to the capacitor 21.
The voltage detection terminal 22 is a terminal for detecting the voltage Vm applied to the capacitor 21. The voltage detection terminal 22 is connected to one end of the capacitor 21 connected to the low-voltage shield 14. Therefore, in the transformer 1, the voltage Vm applied to the capacitor 21 can be detected by the voltage detection terminal 22 and the ground terminal 23.
The voltage detector 24 detects the voltage Vm applied to the capacitor 21. The voltage detector 24 is connected between the voltage detection terminal 22 and the ground terminal 23. In other words, the voltage detector 24 is connected between one end of the capacitor 21 connected to the low-voltage shield 14 and the ground terminal 23. Thereby, the voltage detector 24 can detect the voltage Vm applied to the capacitor 21. As the voltage detector 24, a known detector may be used. In embodiment 1, since the transformer 1 includes the voltage detector, it is not necessary to separately connect the voltage detector.
The container 31 accommodates the core 10, the primary winding 11, the secondary winding 12, the high-voltage shield 13, and the low-voltage shield 14 in a sealed state. The container 31 is filled with, for example, 0.55MPa of SF 6 As an insulating gas. However, the pressure and type of the gas filled in the container 31 are not limited thereto.
A non-grounded terminal 11a for inputting the primary voltage V1 to the primary winding 11 is provided at a position pulled out from the container 31 via a bushing (bushing) 33. Instead of the bushing 33, an insulating spacer including a main body made of insulating resin and a buried conductor provided so as to penetrate the main body may be used. The terminal 11a is connected to the primary winding 11 through a connection conductor 11 b.
The terminal box 32 also accommodates other input/output terminals for the primary winding 11 and the secondary winding 12. In the terminal box 32, an input terminal (terminal V in the circuit diagram of fig. 4) of the primary winding 11 on the opposite side of the terminal 11a and output terminals (terminal u and terminal V in the circuit diagram of fig. 4) of the leads 12a connected to the secondary winding 12 via the lead connecting portion 16 are housed.
In order to avoid complication, these terminals and lead wires connecting the terminals with the primary winding 11 and the secondary winding 12 are not shown in fig. 1. Unlike the container 31, it is not necessary to fill the terminal box 32 with an insulating gas.
Further, a pull-out member 34 for pulling out the lead wire connected to the low-voltage shield case 14 from the inside of the container 31 into the terminal box 32 is provided in the container 31. Capacitor 21 is disposed in terminal box 32. That is, capacitor 21 is disposed outside container 31. Therefore, in the case where an abnormality occurs in the capacitor 21, the abnormality can be dealt with without opening the container 31 filled with the insulating gas.
(detection of Primary Voltage)
As shown in fig. 4, in the transformer 1, a voltage dividing circuit of the primary voltage V1 induced by the ungrounded high-voltage shield 13 is formed by the dummy capacitor 15 having the capacitance C1 and the capacitor 21 having the capacitance C2.
The value of the capacitance C1 is a known value uniquely determined according to the size and shape of the high-voltage shield 13 and the low-voltage shield 14, the type and pressure of the gas filled in the container 31, and the like. It is needless to say that the value of the electrostatic capacitance C2 is known.
As a result, the voltage Vm applied to the capacitor 21 detected by the voltage detector 24 is a value obtained by assigning the primary voltage V1 induced by the high-voltage shield 13 to the impedance ratio between the dummy capacitor 15 and the capacitor 21. That is, with ω as the angular frequency of the primary voltage V1, the relational expression Vm = V1 × { 1/(j × ω × C2) }/{ 1/(j × ω × C1) + 1/(j × ω × C2) }. Thus, the primary voltage V1 can be calculated by the relational expression V1= Vm × (C1 + C2)/C1. Therefore, in the transformer 1, the voltage Vm applied to the capacitor 21 is measured by the voltage detection terminal 22, whereby the primary voltage V1 applied to the primary winding 11 can be estimated.
Fig. 5 is a block diagram showing a configuration of a main part of the primary voltage estimating device 9. The primary voltage estimating device 9 estimates the magnitude of the primary voltage V1 based on the voltage detected by the voltage detector 24. As shown in fig. 5, the primary voltage estimating device 9 includes a circuit element voltage detecting unit 91 and a primary voltage estimating unit 92.
The circuit element voltage detection unit 91 detects the voltage Vm applied to the capacitor 21 by the voltage detector 24. The circuit element voltage detection unit 91 outputs a signal indicating the voltage Vm to the primary voltage estimation unit 92.
The primary voltage estimating unit 92 calculates the primary voltage V1 from the relational expression based on the capacitance C1 of the dummy capacitor 15, the capacitance (circuit constant) C2 of the capacitor 21, and the voltage Vm applied to the capacitor 21. Therefore, in the gas insulated transformer system 100, the primary voltage V1 can be estimated by the primary voltage estimation device 9.
Fig. 6 is a flowchart showing a process of estimating the primary voltage V1 by the primary voltage estimating device 9. In the process of estimating the primary voltage V1, first, the circuit element voltage detection unit 91 detects the voltage Vm applied to the capacitor 21 (S1). Next, the primary voltage estimating unit 92 estimates the primary voltage V1 (S2).
As described above, in transformer 1 according to embodiment 1, primary voltage V1 can be estimated by measuring voltage Vm applied to capacitor 21. The voltage Vm applied to the capacitor 21 is constant regardless of the load connected to the secondary winding 12.
In a transformer, a study has been made in which a winding for voltage detection is wound around a core independently of a secondary winding for output, and a primary voltage is detected based on a voltage applied to the winding for voltage detection. However, the voltage applied to the voltage detection winding also varies depending on the load current flowing through the secondary winding.
For example, in a method of detecting a primary voltage by providing a voltage detection winding having the same configuration as that of the transformer 1, it is found that an error of about 5% to 10% occurs due to a load under actual use conditions.
However, the transformer 1 of the present embodiment does not generate an error due to the variation of the load because the primary voltage V1 is detected by the above-described method. Therefore, the primary voltage V1 can be estimated with high accuracy in the transformer 1. Furthermore, the transformer can be constructed in a simple manner without the need to include a winding for voltage measurement.
In the transformer, a transformer for measuring the primary voltage V1 is also integrally provided in parallel on the primary side of the transformer 1. However, the transformer having such a structure is complicated and the apparatus is large in size.
Further, it is needless to say that even if a transformer for measuring the primary voltage V1 is arranged on the primary side of the transformer 1 in addition to the transformer, the gas-insulated transformer system 100 is large in size and high in cost. On the other hand, according to the present embodiment, the primary voltage V1 can be detected by a compact and low-cost configuration as the gas-insulated transformer system 100.
In addition, the gas insulated transformer system 100 may include an output device that outputs one or more of the voltage Vm detected by the circuit element voltage detection unit 91 and the primary voltage V1 estimated by the primary voltage estimation unit 92 to a user. As an example of the output device, a display device that displays an image is cited.
The gas-insulated transformer system 100 may further include an alarm device that determines whether or not the primary voltage V1 estimated by the primary voltage estimating unit 92 is within a predetermined range, and that gives an alarm to a user if the voltage is not within the predetermined range. The alarm is formed by an image, light, or sound, for example.
[ embodiment 2 ]
Other embodiments of the present invention will be described below. For convenience of description, members having the same functions as those described in the above embodiment are given the same reference numerals, and description thereof will not be repeated.
As described above, the transformer 1 of embodiment 1 includes the capacitor 21 as a circuit element for detecting the voltage Vm. However, the transformer of the present invention may also include other kinds of circuit elements such as resistors or inductors instead of the capacitor 21.
In this transformer, a voltage dividing circuit is also formed by the dummy capacitor 15 and the circuit element. Therefore, the primary voltage V1 can be estimated based on the voltage Vm applied to the circuit element. However, from the viewpoint of simplifying the calculation of the primary voltage V1 using the above relational expression, it is preferable to use a capacitor as the circuit element in order to avoid the influence of the primary voltage V1 on the exciting current of the core determined by the applied voltage and the load current determined by the magnitude of the load connected secondarily.
[ implementation with software ]
The control block (particularly, the Circuit element voltage detection unit 91 and the primary voltage estimation unit 92) of the primary voltage estimation device 9 may be realized by a logic Circuit (hardware) formed on an Integrated Circuit (IC) chip) or the like, or may be realized by software.
In the latter case, the primary voltage estimating device 9 includes a computer that executes commands of a program as software for realizing the respective functions. The computer includes, for example, at least one processor (control device), and includes at least one computer-readable recording medium storing the program.
The object of the present invention is achieved by the computer reading the program from the recording medium and executing the program. As the processor, for example, a Central Processing Unit (CPU) may be used. As the recording medium, in addition to a "non-transitory tangible medium", for example, a Read Only Memory (ROM), a magnetic tape, a magnetic disk, a card, a semiconductor Memory, a programmable logic circuit, or the like can be used.
Also, a Random Access Memory (RAM) or the like that expands the program may be further included. Further, the program may be supplied to the computer via any transmission medium (a communication network, a broadcast wave, or the like) capable of transmitting the program. Furthermore, an embodiment of the present invention can also be realized by an embodiment using electronic transmission of a data signal embedded in a carrier wave that realizes the program.
[ conclusion ]
The gas-insulated transformer of embodiment 1 of the present invention includes: a core; a secondary winding wound around the core; a primary winding wound outside an outer periphery of the secondary winding coaxially with the secondary winding; a high voltage shield cover covering an outer circumference of the primary winding; the low-voltage shielding cover is opposite to the high-voltage shielding cover; a ground terminal; and a circuit element having one end connected to the low voltage shield and the other end connected to the ground terminal.
According to the above configuration, the voltage divider circuit is formed by the dummy capacitor formed by the high-voltage shield and the low-voltage shield, and the circuit element connected to the low-voltage shield and the ground terminal. By detecting the voltage applied to the circuit element, the primary voltage induced by the high-voltage shield can be calculated. Therefore, the gas-insulated transformer does not have to be increased in size, and a function of estimating the primary voltage can be added without being affected by the load current.
In the gas-insulated transformer according to embodiment 2 of the present invention, in embodiment 1, the axial direction of the secondary winding is longer than the axial direction of the primary winding.
According to the above configuration, the secondary winding functions as a shield case to reduce the influence of the edge of the core, the fixing member, and other members on the electric field formed by the primary winding.
In the gas-insulated transformer according to embodiment 3 of the present invention, in embodiment 2, the low-voltage shield case is disposed between the high-voltage shield case and a region of the core not covering the secondary winding.
According to the above configuration, the influence of the members such as the edge of the core and the fixing member on the electric field formed by the primary winding can be reduced by the low-voltage shield case.
In addition, in example 2 or 3, the gas-insulated transformer according to example 4 of the present invention further includes a lead connecting portion to which a lead of the secondary winding is connected, and the low-voltage shield case is disposed between the high-voltage shield case and the lead connecting portion.
According to the above configuration, the influence of the lead connection portion on the electric field formed by the primary winding 11 can be reduced by the low-voltage shield case.
Further, a gas-insulated transformer according to embodiment 5 of the present invention is the gas-insulated transformer according to any one of embodiments 1 to 4, further comprising a voltage detector connected between the one end of the circuit element and the ground terminal.
According to the above configuration, it is not necessary to separately connect a voltage detector for detecting a voltage applied to the circuit element.
Further, a gas-insulated transformer system according to embodiment 6 of the present invention includes: the gas-insulated transformer of example 5; and a primary voltage estimating device for estimating the magnitude of the primary voltage based on the voltage detected by the voltage detector.
According to the above configuration, the primary voltage can be estimated by the primary voltage estimating device.
A voltage estimation method according to embodiment 7 of the present invention is a voltage estimation method for estimating a primary voltage of a gas-insulated transformer, the gas-insulated transformer including: a core; a secondary winding wound around the core; a primary winding wound outside an outer periphery of the secondary winding coaxially with the secondary winding; a high voltage shield cover covering an outer circumference of the primary winding; the low-voltage shielding cover is opposite to the high-voltage shielding cover; a ground terminal; and a circuit element having one end connected to the low-voltage shield case and the other end connected to the ground terminal, the voltage estimation method including: detecting a voltage applied to the circuit element; and estimating a primary voltage based on an electrostatic capacitance between the high-voltage shield case and the low-voltage shield case, a circuit constant of the circuit element, and a voltage applied to the circuit element.
According to the above configuration, in the voltage estimating method, first, the voltage of the circuit element connected to the low-voltage shield and the ground terminal is detected, and the primary voltage is estimated based on the voltage. Therefore, the primary voltage is not directly measured, but can be detected by estimation.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. Further, by combining the technical means disclosed in the respective embodiments, new technical features can be formed.
Description of the symbols
1: transformer
9: primary voltage estimating device
10: core
11: primary winding
12: secondary winding
13: high-voltage shielding cover
14: low-voltage shielding cover
16: lead wire connecting part
21: capacitor (Circuit component)
22: voltage detection terminal
23: grounding terminal
24: voltage detector
31: container with a lid
100: gas insulated transformer system
Claims (7)
1. A gas-insulated transformer, characterized by comprising:
a core;
a secondary winding wound around the core;
a primary winding wound outside an outer periphery of the secondary winding coaxially with the secondary winding;
a high voltage shield cover covering the outer periphery of the primary winding;
the low-voltage shielding cover is opposite to the high-voltage shielding cover;
a ground terminal; and
and a circuit element having one end connected to the low voltage shield and the other end connected to the ground terminal.
2. The gas-insulated transformer according to claim 1, characterized in that: the axial direction of the secondary winding is longer than the axial direction of the primary winding.
3. The gas-insulated transformer of claim 2, characterized in that: the low voltage shield is disposed between the high voltage shield and an area of the core not covering the secondary winding.
4. The gas-insulated transformer according to claim 2 or 3, characterized in that:
further comprises a lead wire connecting part which is connected with a lead wire of the secondary winding,
the low-voltage shielding cover is configured between the high-voltage shielding cover and the lead connecting part.
5. The gas-insulated transformer of any one of claims 1 to 4, characterized in that: further comprising a voltage detector connected between the one end of the circuit element and the ground terminal.
6. A gas insulated transformer system, comprising:
the gas-insulated transformer of claim 5; and
and a primary voltage estimating device for estimating the magnitude of the primary voltage based on the voltage detected by the voltage detector.
7. A voltage estimation method that estimates a primary voltage of a gas-insulated transformer, the gas-insulated transformer comprising:
a core;
a secondary winding wound around the core;
a primary winding wound outside an outer periphery of the secondary winding coaxially with the secondary winding;
a high voltage shield cover covering the outer periphery of the primary winding;
the low-voltage shielding cover is opposite to the high-voltage shielding cover;
a ground terminal; and
a circuit element having one end connected to the low-voltage shield case and the other end connected to the ground terminal,
the voltage estimation method is characterized by including:
detecting a voltage applied to the circuit element; and
estimating a primary voltage based on an electrostatic capacitance between the high-voltage shield case and the low-voltage shield case, a circuit constant of the circuit element, and a voltage applied to the circuit element.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2020/024974 WO2021260874A1 (en) | 2020-06-25 | 2020-06-25 | Gas insulated transformer, gas insulated transformer system and voltage estimation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115702464A true CN115702464A (en) | 2023-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080102331.XA Pending CN115702464A (en) | 2020-06-25 | 2020-06-25 | Gas-insulated transformer, gas-insulated transformer system, and voltage estimation method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2021260874A1 (en) |
| CN (1) | CN115702464A (en) |
| WO (1) | WO2021260874A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0624991Y2 (en) * | 1988-02-16 | 1994-06-29 | 三菱電機株式会社 | Gas insulated transformer |
| JPH04125424U (en) * | 1991-05-07 | 1992-11-16 | 日新電機株式会社 | Gas insulation test transformer |
| JPH118134A (en) * | 1997-06-13 | 1999-01-12 | Makoto Yamamoto | Transformer for receiving equipment |
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2020
- 2020-06-25 CN CN202080102331.XA patent/CN115702464A/en active Pending
- 2020-06-25 WO PCT/JP2020/024974 patent/WO2021260874A1/en active Application Filing
- 2020-06-25 JP JP2022532172A patent/JPWO2021260874A1/ja active Pending
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| JPWO2021260874A1 (en) | 2021-12-30 |
| WO2021260874A1 (en) | 2021-12-30 |
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