CN216054208U - Converter transformer with +/-1100 kV on valve side - Google Patents
Converter transformer with +/-1100 kV on valve side Download PDFInfo
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- CN216054208U CN216054208U CN202121410066.XU CN202121410066U CN216054208U CN 216054208 U CN216054208 U CN 216054208U CN 202121410066 U CN202121410066 U CN 202121410066U CN 216054208 U CN216054208 U CN 216054208U
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Abstract
The utility model belongs to the field of transformer manufacturing, and particularly relates to a converter transformer with +/-1100 kV on a valve side. The oil tank comprises a net sleeve, a neutral point sleeve, an iron core with a plurality of core columns, a valve sleeve pipe a and a valve sleeve pipe b, wherein the iron core, the valve sleeve pipe a and the valve sleeve pipe b are arranged in the oil tank; the pressure regulating coil, the net coil and the valve coil are sequentially arranged from the opposite side of the stem; bias coils are arranged on the insulating part at the lower part of the voltage regulating coil and the insulating part at the lower part of the net coil; the outgoing line of the voltage regulating coil is connected with the switch, and the outgoing lead of the switch is connected with the neutral point sleeve; the net coil of each core column is axially led out from an upper outgoing line and is connected with a net sleeve, and the lower axial outgoing line of the net coil is connected with a switch; each valve coil is respectively led out from the upper end part and the lower end part, and is respectively connected with the valve sleeve a and the valve sleeve b after being led out in the radial direction. The utility model adopts a bias coil structure, reduces the number of the voltage regulating leads by half, not only solves the problem of local overheating caused by overlarge voltage regulating current, but also facilitates the arrangement of the voltage regulating leads.
Description
Technical Field
The utility model belongs to the field of transformer manufacturing, and particularly relates to a converter transformer with +/-1100 kV on a valve side.
Background
The highest voltage level of the valve side of the traditional direct current engineering is 800 kV. At present, a plurality of +/-800 kV direct current transmission projects are available, including upward, Hami-Zheng state, Xiludu-Zhe West, Jinbei-Nanjing, Sn Union-Thai state, Zalutte-Qingzhou and the like, and the transmission distance is long because the Changji-ancient spring transmission distance is 3284 km. When the power transmission distance is farther, the direct-current power transmission cost is lower, the valve side voltage is increased, the transmission loss can be greatly reduced, the energy saving and cost reduction are realized, so the cost performance of the +/-1100 kV direct-current power transmission project is far higher than that of the +/-800 kV direct-current project, the northwest power grid of China is 750kV power grid, and the network side voltage of the converter transformer is +/-750 kV and the valve side +/-1100 kV from the energy saving and cost reduction. The development of the +/-1100 kV converter transformer not only fills the blank at home and abroad, but also is beneficial to ultra-long distance transmission for ultra-long distance direct current transmission.
Secondly, because the electric field at the end part of the existing converter transformer is higher, the cooling oil duct cannot be directly led into the coil from the end part of the coil, so that the end part of the coil is damaged; meanwhile, the capacity of the converter transformer is large, and the tapping number of the voltage regulating leads is large, so that large current can be formed when the voltage regulating leads are combined to cause local overheating, and when the tapping leads are large in number, the internal structure is complex, and the assembly of the converter transformer body is not facilitated.
SUMMERY OF THE UTILITY MODEL
Aiming at the problem that a converter transformer with a valve side of +/-1100 kV does not exist in the prior art, the utility model aims to provide the converter transformer with the valve side of +/-1100 kV so as to solve the problems of transmission loss and unreasonable economic effect of over 3000km ultra-long distance transmission.
The technical scheme adopted by the utility model for realizing the purpose is as follows:
the converter transformer with the valve side of +/-1100 KV comprises: the oil tank comprises a net sleeve, a neutral point sleeve, an iron core with a plurality of core columns, a valve sleeve pipe a and a valve sleeve pipe b, wherein the iron core, the valve sleeve pipe a and the valve sleeve pipe b are arranged in the oil tank;
on each stem, a pressure regulating coil, a net coil and a valve coil are sequentially arranged from the opposite side of the stem; bias coils are arranged on the insulating part at the lower part of the voltage regulating coil and the insulating part at the lower part of the net coil;
the outgoing line of the voltage regulating coil of each stem is connected with a switch, and the outgoing lead of the switch is connected with a neutral point sleeve on the oil tank;
the net coil of each core column is axially led out from an upper outgoing line and is connected with a net sleeve on the oil tank, and the lower end part of the net coil of each core column is axially led out and is connected with a switch;
each valve coil is respectively led out from the upper end part and the lower end part, and is respectively connected with the valve sleeve a and the valve sleeve b after being led out in the radial direction.
The voltage regulating coil of each stem and the lower part of the net coil are respectively connected with the switch through a bias coil.
The switch is an on-load tap-changer.
And the outlet end of the outgoing line of the valve coil is provided with outgoing line insulation.
After the valve coils of each stem are connected in parallel, the valve coils are insulated through outlet wires, led out from the valve side lifting seat through the outlet wire device and the lifting seat outlet wire device in sequence and connected with the valve side sleeve.
And a shielding ring for uniformly distributing the electric field of the converter transformer is arranged at the joint of the lower part of the valve side lifting seat and the top of the tank cover of the oil tank.
The wire outlet device and the wire outlet device of the lifting seat are coaxially arranged with the valve side lifting seat; and the wire outlet device of the lifting seat are internally provided with pressure equalizing balls.
The cooler group is fixed on the short shaft side of the oil tank through a support, the cooler group is connected with the oil tank through an oil pipeline, after entering the oil tank through the cooler group, transformer oil respectively flows into the pressure regulating coil, the mesh coil and the valve coil through internal insulation oil guide pipes, is introduced from the corresponding side surfaces of the pressure regulating coil, the mesh coil and the valve coil, and is introduced into the coil from the middle lower part beside the pressure regulating coil, the mesh coil and the valve coil and then is led out from the middle upper part beside the other side of the coil; the internal insulation oil guide pipe is of a snake-shaped bent structure.
The voltage regulating coil is connected with the switch wiring terminal through a voltage regulating lead of the switch, so that the switch rotates through the tapping selector to realize the access of the bias coil at the lower part of the voltage regulating coil.
The utility model has the following beneficial effects and advantages:
1. the coil arrangement mode of the converter transformer adopts a pressure regulating coil-net coil- +/-1100 kV valve coil structure in sequence from an iron core, a +/-1100 kV outgoing line is radially and horizontally led out from the upper end part and the lower end part of the valve coil, a 'hand-in-hand' structure is adopted between each column, the +/-1100 kV outgoing line is led out to the outer side of a side column of a transformer body in an oil tank, then is vertically led out through a tank cover and is connected to a +/-1100 kV valve casing terminal through a +/-1100 kV valve outgoing line device; the valve side coil end is axially led out, so that the distance from the valve side lead-out wire to the ground is ensured, structural damage caused by upper insulating parts such as a pressing plate is avoided, and the mechanical strength and short circuit resistance of the pressing plate are ensured. The design and operation difficulty of the main insulation structure is reduced while the performance parameters are met, and the safety and reliability of the product are improved.
2. The utility model adopts a bias coil structure, reduces the number of the voltage regulating leads by half, not only solves the problem of local overheating caused by overlarge voltage regulating current, but also facilitates the arrangement of the voltage regulating leads. If the subsequent products have excessive voltage-regulating tapping and larger transformer capacity, a bias coil structure can be adopted to avoid the problem.
3. The utility model develops a main longitudinal insulation structure of a +/-1100 kV valve coil, and because the electric field at the end part is higher, a cooling oil duct cannot directly lead in the coil from the end part of the coil, thereby developing a cooling structure which enters the coil from the middle part of the valve coil assembly and flows out from the middle part of the valve coil assembly.
4. The utility model effectively solves the problem of over 3000km direct current transmission, and the voltage lifting can effectively reduce the loss of the direct current transmission, greatly improves the transmission efficiency and improves the economic benefit.
5. The valve side +/-1100 kV converter transformer is developed and designed for the first time, is the converter transformer with the highest voltage grade and insulation level at home and abroad at present, and fills the blank of international and domestic technologies and manufacturing in the field of converter transformers.
Drawings
FIG. 1 is a diagram of the external structure of a converter transformer according to the present invention;
FIG. 2 is a schematic diagram of the arrangement of the internal windings and the internal wiring of the converter transformer according to the present invention;
FIG. 3 is a schematic diagram of the internal structure of the converter transformer according to the present invention;
FIG. 4 is a schematic diagram of the converter transformer wiring of the present invention;
FIG. 5 is a schematic diagram of the structure of the cooling gallery of the present invention;
FIG. 6 is a graph of transmission distance versus cost for the present invention versus a converter transformer;
the device comprises a pressure regulating coil 1, a net coil 2, a valve coil 3, an outgoing line insulator 4, an outgoing line device 5, a box cover 6, a shielding ring 7, a valve side lifting seat 8, a lifting seat outgoing line device 9, a net sleeve 10, a neutral point sleeve 11, a valve side sleeve 12, an iron core 13, a cooler group 14, an oil tank 15, a switch 16 and a bias coil 17.
Detailed Description
The utility model is further elucidated with reference to the accompanying drawings.
The valve side +/-1100 kV converter transformer is a single-phase on-load voltage regulation converter transformer and is the converter transformer with the highest voltage level at the valve side at present. Fig. 1 is a diagram showing the external structure of the converter transformer according to the present invention. The net sleeve 10(A) and the neutral point sleeve 11(B) are arranged on the top of the box cover 6, and the +/-1100 kV valve sleeve a and the +/-1100 kV valve sleeve B are arranged on the top of the box cover 6; the cooler package 14 is arranged on the other side of the minor axis of the oil tank 15.
As shown in figure 2, the arrangement mode of the valve side +/-1100 kV converter transformer adopts a structure that a voltage regulating coil 1-a net coil 2- +/-1100 kV valve coil 3 is sequentially arranged from an iron core 13, the +/-1100 kV valve coil 3 is led out horizontally in a radial direction from an upper outgoing line 17 of the valve coil and a lower outgoing line 18 of the valve coil, is led to the outer side of a side column of a transformer body in an oil tank 15, is led out vertically through a +/-1100 kV outgoing line device at a tank cover 6, enters a valve side lifting seat 8 after being led out, and is installed on a valve side sleeve 12 after passing through an internal outgoing line device 9 of the 1100kV valve lifting seat; the cooler package 14 is arranged on the stub shaft on the other side of the oil tank 15.
The following description is respectively given with reference to the schematic diagram of the arrangement and wiring of the internal winding of the converter transformer in fig. 2 and the schematic diagram of the arrangement and the wire outlet of the ± 1100kV valve in the converter transformer in fig. 3 as follows:
an iron core 13 is arranged in the oil tank 15, and a pressure regulating coil 1, a net coil 2 and a valve coil 3 are sequentially arranged on each iron core column from the iron core 13; a bias coil 17 is arranged on the lower insulation part of the voltage regulating coil 1 and the net coil 2;
the outgoing line of the voltage regulating coil 1 of each iron core column is connected in parallel and then is connected with a switch 16, and the outgoing line of the switch 16 is connected with a neutral point sleeve 11 on a tank cover 6 of an oil tank 15;
the net coils 2 of each iron core column are mutually connected through an axial outgoing line at the upper end part and are connected with a net sleeve 10 on a tank cover 6 of an oil tank 15, and the axial outgoing line at the lower end part of the net coil 2 of each iron core column is connected with a switch 16;
the upper end part and the lower end part of the valve coil 3 are respectively led out to form a leading-out wire, and the leading-out wires are respectively connected with the valve sleeve a and the valve sleeve b after being led out in the radial direction.
The lower parts of the voltage regulating coil 1 and the net coil/2 of each stem are respectively connected with a switch 16 through a bias coil 17.
The internal winding arrangement of the utility model is as follows:
the valve side +/-1100 kV converter transformer adopts an iron core 13-voltage regulating coil 1-network coil 2-valve coil 3-oil tank 15 structure from inside to outside. As shown in fig. 2 to 3, the voltage regulating coil 1 is arranged at the innermost side near the iron core 13, and then the mesh coil 2, and the ± 1100kV valve coil 3 is placed at the outermost side. The +/-1100 kV valve coil 3 with high voltage grade is placed outside the grid coil 2, the end part of the valve coil 3 is radially led out, the distance from a valve side lead-out wire to the ground is ensured, structural damage caused by upper insulating parts such as a pressing plate is avoided, and the mechanical strength and the short circuit resistance of the pressing plate are ensured. The structure meets performance parameters, reduces the design and operation difficulty of the main insulation structure, and improves the safety and reliability of products.
The internal wiring of the utility model is as follows:
the net coils 2 and the valve coils 3 between the iron core columns are of a parallel structure, leading-out wires between the same coils are connected together and then led out to the sleeve, leading-out wires of the voltage regulating coils 1 are led to the switch 16 to be connected in parallel in the switch 16, the net side neutral point sleeve 11 on one side of the switch 16 is connected, and the other side of the switch is connected with the tail end of the net coil.
The end part of the net coil 2 is axially led out, and the head end and the tail end of the net coil are respectively led out from the box cover 6 and connected to a net sleeve 10 and a neutral point sleeve 11.
As shown in fig. 3, which is a schematic structural diagram of the interior of the converter transformer of the present invention, after the valve coils 3 of each main column are connected in parallel, and pass through the outlet insulation 4, the valve coils are led out from the valve side lifting seat 8 through the outlet device 5 and the lifting seat outlet device 9 in sequence, and are connected with the valve side sleeve 12;
the outlet device 5 and the outlet device 9 of the lifting seat are arranged concentrically with the valve side lifting seat 8; the wire outlet devices 5 and 9 are internally provided with pressure equalizing balls; the valve side lead wires sequentially penetrate through the pressure equalizing ball of the wire outlet device 5 and the pressure equalizing ball of the wire outlet device 9 of the lifting seat and are connected with the valve side sleeve 12. An insulating outgoing line block (4) is arranged at the outlet of the lead of the valve coil (3), and the outgoing line insulation (4) can divide an oil gap and play a role in fixing the outgoing line.
The head end and the tail end of the valve coil 3 are led out horizontally in a radial direction, are connected with a valve sleeve pipe a and a valve sleeve pipe b through upper and lower leading-out wires, are led to the outer side of a side column of the device body in an oil tank 15 through an insulated leading-out wire 4, then are led out vertically into a valve side lifting seat 8 through a wire outlet device 5 and a box cover 6, and are connected to a valve side sleeve pipe 12 through a lifting seat wire outlet device 9.
The outlet device 5 and the outlet device 9 of the lifting seat are coaxially arranged with the valve side lifting seat 8; and the wire outlet device 5 and the wire outlet device 9 of the lifting seat are internally provided with pressure equalizing balls.
In order to make the electric field distributed evenly, a shielding ring 7 is arranged at the joint of the box cover 6 and the valve side lifting seat 8, the upper part and the lower part of the valve coil 3 are led out in the radial direction, the lead-out wire at the upper part of the valve coil 3 and the lead-out wire at the lower part of the valve coil 3 enter the valve side lifting seat 8 through a lead-out device 5, and a lifting seat lead-out device 9 is arranged at the joint of the valve side lifting seat and a valve side sleeve 12.
As shown in fig. 5, is a 1100kV valve coil oil flow line. The cooler group 14 is fixed on the short shaft side of the oil tank 15 through a bracket, the cooler group 14 is connected with the oil tank 15 through an oil pipeline, after the transformer oil enters the oil tank through the cooler group 14, the transformer oil respectively flows into the pressure regulating coil 1, the net coil 2 and the valve coil 3 through internal insulation oil guide pipes, because the insulation level of the end part of the valve coil 3 is high, if the oil flow flows into the coil from the end part, the oil flow is damaged, in order to ensure that the end insulation is not damaged, the oil pipeline is led in from the side surface of the coil, the oil flow is led to the middle lower part of the valve coil 3, enters the coil from the middle lower part of the valve coil 3 and is led out from the side of the middle upper part of the valve coil 3; the internal insulation oil guide pipe is of a snake-shaped bent structure.
As shown in fig. 4, it is a schematic diagram of the converter transformer wiring of the present invention;
the switch 16 is an on-load tap-changer, and the tail end of the network coil 2 and each tap section of the voltage regulating coil 1 are led to the switch 16, so that on-load voltage regulating connection and tap regulation are realized; the voltage regulating coil 1 is connected with a connecting terminal of the switch 16 through a voltage regulating lead of the switch 16, so that the switch 16 rotates through a tapping selector to realize the access of a bias coil 17 at the lower part of the voltage regulating coil 1.
The bias coil 17 is located in the insulation end ring at the lower part of the voltage regulating coil 1 and the network coil 2 and connected with the tapping switch 16, after the voltage regulating coil 1 is connected with the wiring terminal with the corresponding number of the switch 16 through the voltage regulating lead, the switch 16 can select whether the bias coil 4 is connected or not through the selector of the switch, the number of turns of 1 tapping of the bias coil 17 and the voltage regulating coil 1 is the same, the tapping voltage of the bias coil 17 is 2 times of the voltage of each stage of the voltage regulating coil 1, so that the number of the voltage regulating lead is reduced, and after the bias coil 17 is connected in series, at least one voltage regulating tapping is increased or reduced. When the bias coil 17 is connected, a tap is added on the voltage regulating coil 1, so that the voltage regulating function is realized;
both ends of the bias coil 17 are connected into the switch 16, the number of turns of the bias coil is exactly equal to that of one tap of the voltage regulating coil, therefore, whether the bias coil is connected or not is selected through the switch tap selector to adjust the tap, the connection mode is as shown in fig. 4, and the switch 16 is positioned at the position of a network side neutral point of the converter transformer and is connected with the network side neutral point sleeve 11. The adjusted tap line is led out by the switch 16 to the neutral bushing 11.
In addition, as shown in fig. 5, it is a schematic diagram of the structure of the cooling oil passage of the present invention; the conventional converter transformer product cooling oil circuit enters a coil from the end part of the coil for cooling, while the other side of the short shaft side of an oil tank 15 is provided with a cooler group 14, the cooler group 14 is fixed together through a bracket and then is connected to the oil tank 14 through an oil pipeline, and transformer oil enters the oil tank through the cooler 14, then enters the whole body of the transformer through an internal insulation oil guide pipe and respectively flows into a pressure regulating coil 1, a net coil 2 and a valve coil 3. Because the electric field at the end part of the valve coil 3 is higher, in order to not damage the electric field structure at the end part of the coil, after oil flow enters a high electric field area, the oil flow is introduced from the corresponding side surfaces of the pressure regulating coil 1, the net coil 2 and the valve coil 3, the oil flow is introduced to the middle lower parts beside the pressure regulating coil 1, the net coil 2 and the valve coil 3, enters the coil and then is led out from the middle upper part beside the other side of the coil; the cooling oil duct is of a snake-shaped bent structure.
The converter transformer shown in the attached figures 2 and 4 of the embodiment of the utility model has a structure with two main columns and two side columns, and the utility model is also suitable for a structure with three main columns and two side columns. The coils on the added main column are also in a parallel configuration.
As shown in fig. 6, a comparison graph of transmission distance versus cost is shown between the present invention and a converter transformer;
when the power transmission distance is farther, the direct-current power transmission cost is lower, the valve side voltage is increased, the transmission loss can be greatly reduced, the energy saving and cost reduction are realized, so that the cost performance of the +/-1100 kV direct-current power transmission project is far higher than that of the +/-800 kV direct-current project, the northwest power grid of China is 750kV power grid, the network side voltage of the converter transformer is +/-750 kV from the energy saving and cost reduction point, and the valve side voltage of the converter transformer is +/-1100 kV. And for the ultra-long distance direct current transmission, the +/-1100 kV direct current transmission is beneficial to the ultra-long distance transmission.
As shown in fig. 1-5, the utility model adopts the structure that a converter transformer coil arrangement mode starts from the opposite side of each core column of an iron core 13, a pressure regulating coil 1-a net coil 2- +/-1100 kV valve coil 3 is sequentially adopted, the +/-1100 kV valve coil 3 is led out horizontally from an upper outgoing line 17 of the valve coil and a lower outgoing line 18 of the valve coil in the radial direction, is led out to the outer side of a side column of a transformer body in an oil tank 15, is vertically led out through a +/-1100 kV outgoing line device at a tank cover 6, enters a valve side elevating seat 8 after being led out, and is arranged on a valve side sleeve 12 after passing through an internal outgoing line device 9 of the 1100kV valve elevating seat;
arranging a cooler group 14 on a short shaft at the other side of an oil tank 15, enabling the cooler group to enter the whole body of the oil tank through an internal insulation oil guide pipe, enabling the cooler group to respectively flow into the pressure regulating coil 1, the net coil 2 and the valve coil 3, guiding oil flow to the middle lower parts of the pressure regulating coil 1, the net coil 2 and the valve coil 3, enabling the oil flow to enter the coil from the middle lower parts and then to be led out from the side of the middle upper part; the bias coil 17 is connected in the insulating end ring at the lower part of the voltage regulating coil 1 and the net coil 2, and is positioned in the insulating end ring at the lower part of the voltage regulating coil 1 and the net coil 2 and connected with the tap switch 16.
Claims (9)
1. Converter transformer of valve side 1100kV, characterized by, include: the valve comprises a net sleeve (10), a neutral point sleeve (11), an iron core (13) which is arranged in an oil tank (15) and is provided with a plurality of core columns, a valve sleeve pipe a and a valve sleeve pipe b;
on each stem, a pressure regulating coil (1), a net coil (2) and a valve coil (3) are sequentially arranged from the opposite side of the stem; bias coils (17) are arranged on the insulating part at the lower part of the voltage regulating coil (1) and the insulating part at the lower part of the net coil (2);
the outgoing line of the pressure regulating coil (1) of each stem is connected with a switch (16), and the outgoing lead of the switch (16) is connected with a neutral point sleeve (11) on an oil tank (15);
the net coil (2) of each core column is axially led out from an upper outgoing line and is connected with a net sleeve (10) on an oil tank (15), and the axial outgoing line of the lower end part of the net coil (2) of each core column is connected with a switch (16);
each valve coil (3) is respectively led out from the upper end part and the lower end part and is respectively connected with the valve sleeve a and the valve sleeve b after being led out in the radial direction.
2. Converter transformer of ± 1100kV on valve side according to claim 1, characterized in that the lower parts of the regulating coil (1) and the grid coil (2) of each stem are respectively connected with the switch (16) through a bias coil (17).
3. Converter transformer of valve side ± 1100kV according to claim 1, characterized in that said switch (16) is an on-load tap changer.
4. The converter transformer of +/-1100 kV at the valve side of claim 1, wherein an outlet insulation (4) is arranged at the outlet of an outlet wire of the valve coil (3).
5. The converter transformer of +/-1100 kV at the valve side of claim 1, wherein after being connected in parallel, the valve coil (3) of each core column is led out of a valve side lifting seat (8) through a wire outlet device (5) and a lifting seat wire outlet device (9) in sequence and is connected with a valve side sleeve (12) through a wire outlet insulation (4).
6. The converter transformer of ± 1100kV on the valve side according to claim 5, characterized in that the junction of the lower part of the valve-side elevating seat (8) and the top of the tank cover (6) of the oil tank (15) is provided with a shielding ring (7) for making the electric field distribution of the converter transformer uniform.
7. The converter transformer of +/-1100 kV on the valve side of claim 5, wherein the outlet device (5) and the lifting seat outlet device (9) are coaxially arranged with the valve side lifting seat (8); and the wire outlet device (5) and the wire outlet device (9) of the lifting seat are internally provided with pressure equalizing balls.
8. Converter transformer of ± 1100kV on the valve side according to claim 1, characterized by further comprising a cooler group (14); the cooler group (14) is fixed on the short shaft side of the oil tank (15) through a support, the cooler group (14) is connected with the oil tank (15) through an oil pipeline, after the transformer oil enters the oil tank through the cooler group (14), the transformer oil respectively flows into the pressure regulating coil (1), the net coil (2) and the valve coil (3) through internal insulation oil guide pipes, is introduced from the corresponding side surfaces of the pressure regulating coil (1), the net coil (2) and the valve coil (3), and the oil flow is introduced to the middle lower part of the side of the pressure regulating coil (1), the net coil (2) and the valve coil (3), enters the coil and is then led out from the side of the middle upper part of the other side of the coil; the internal insulation oil guide pipe is of a snake-shaped bent structure.
9. The converter transformer of +/-1100 kV at the valve side of claim 1, wherein the voltage regulating coil (1) is connected with a terminal of the switch (16) through a voltage regulating lead of the switch (16), so that the switch (16) is rotated through a tapping selector to realize the connection of a bias coil (17) at the lower part of the voltage regulating coil (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121410066.XU CN216054208U (en) | 2021-06-24 | 2021-06-24 | Converter transformer with +/-1100 kV on valve side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121410066.XU CN216054208U (en) | 2021-06-24 | 2021-06-24 | Converter transformer with +/-1100 kV on valve side |
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| Publication Number | Publication Date |
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| CN216054208U true CN216054208U (en) | 2022-03-15 |
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| CN202121410066.XU Active CN216054208U (en) | 2021-06-24 | 2021-06-24 | Converter transformer with +/-1100 kV on valve side |
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| Country | Link |
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| CN (1) | CN216054208U (en) |
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2021
- 2021-06-24 CN CN202121410066.XU patent/CN216054208U/en active Active
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