Resistance-capacitance unit and direct-current voltage transformer

Abstract

The invention relates to a resistance-capacitance unit and a direct-current voltage transformer, the direct-current voltage transformer comprises a gas insulation metal closed shell and a high-voltage arm installed in the gas insulation metal closed shell, the high-voltage arm comprises a resistance-capacitance module, the resistance-capacitance module comprises a plurality of resistance-capacitance units connected in series, and each resistance-capacitance unit comprises a lower conductive seat and an upper conductive seat. A capacitor is arranged between the lower conductive seat and the upper conductive seat, a plurality of resistors are arranged on the periphery of the capacitor, the lower end of each resistor is fixedly connected with the lower conductive seat, and the upper end of each resistor is conductively connected with the upper conductive seat through an elastic conductive part. Therefore, not only can a circuit be connected, the resistor assembly tolerance be adjusted and the manufacturing precision requirement of the resistor and the capacitor in dimension be reduced, but also the vibration of the resistor caused by vibration can be compensated in novel power transmission scenes such as an offshore commutation platform and the like, the resistor is prevented from deviating and even falling off from an initial position due to vibration, and the service life of the resistor is prolonged. And faults of the direct-current voltage transformer are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission high voltage electrical appliances, and in particular to a resistor-capacitor unit and a direct current voltage transformer. Background Art

[0002] DC power transmission has the advantages of large transmission capacity, long transmission distance, and low line loss. It has been rapidly developed in my country, and many UHV DC power transmission projects have been built. Compared with AC systems, DC systems have low line impedance and more complex protection. DC voltage transformers are required to provide control and protection signals for the safe and stable operation of DC power transmission systems.

[0003] However, most of the current DC voltage transformers are open structures with large overall size, high center of gravity, large stray capacitance, and are easily affected by external electromagnetic environment interference.

[0004] In the prior art, a Chinese invention patent application with application publication number CN117995540A and application publication date 2024.05.07 discloses a resistor-capacitor module and a DC voltage transformer. The DC voltage transformer of the invention includes a high-voltage arm unit, and the high-voltage arm unit includes a sealed shell, in which a resistor-capacitor module is installed, and the inner cavity of the sealed shell is filled with an insulating medium that immerses the resistor-capacitor module. The resistor-capacitor module includes a resistor-capacitor unit and an insulating sealed cylinder, and the resistor-capacitor unit is fixedly installed in the insulating sealed cylinder. Both ends of the insulating sealed cylinder are encapsulated with electrical connections connecting the internal resistor-capacitor unit and the external conductor component, and the inner cavity of the insulating sealed cylinder is filled with an insulating medium that immerses the resistor-capacitor unit. The DC voltage transformer of the invention is designed as a closed insulation structure, which can effectively solve the problems of the traditional open DC voltage transformer with large overall size, high center, large stray capacitance, and easy to be interfered by the external electromagnetic environment.

[0005] However, if the DC voltage transformer of the invention is used in new power transmission scenarios such as offshore converter platforms, the DC voltage transformer is easily affected by environmental interference and vibrates due to the harsh environment. This will cause the larger resistors in the internal resistance and capacitance units of the DC voltage transformer to shift from their initial positions or even fall off due to vibration, causing the DC voltage transformer to malfunction. Summary of the invention

[0006] The purpose of the present invention is to provide a resistance-capacitance unit, which is used to solve the problem that when the DC voltage transformer in the prior art is used in new power transmission scenarios such as offshore converter platforms, the resistor with a large mass in the resistance-capacitance unit inside the DC voltage transformer will be offset from the initial position or even fall off due to vibration, causing the DC voltage transformer to malfunction. The purpose of the present invention is also to provide a DC voltage transformer, which is used to solve the above technical problems.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions.

[0008] A resistor-capacitor unit is connected in series up and down when in use. The resistor-capacitor unit comprises a lower conductive seat and an upper conductive seat. A capacitor is arranged between the lower conductive seat and the upper conductive seat. A plurality of resistors are arranged around the capacitor. The lower end of each resistor is fixedly connected to the lower conductive seat and the upper end is conductively connected to the upper conductive seat through an elastic conductive member.

[0009] Furthermore, a downwardly protruding middle protrusion is provided in the middle of the upper conductive seat, and the elastic conductive member is an L-shaped elastic supporting sheet, one side of which is fixed to the side of the middle protrusion and the other side is fixed to the upper end of the resistor, and the capacitor is mounted on the middle protrusion.

[0010] Furthermore, the upper conductive seat comprises a circular fixing plate, and a connecting protrusion for connecting with the lower side surface of the lower conductive seat of the upper adjacent resistor-capacitor unit is arranged on the upper surface of the circular fixing plate.

[0011] Furthermore, there are multiple connecting protrusions and they are evenly arranged in the circumferential direction.

[0012] Furthermore, a unit shielding cover for shielding the connection position of two adjacent resistor-capacitor units is installed on the upper conductive seat or the lower conductive seat.

[0013] Furthermore, the unit shielding cover is installed on the lower conductive seat, which includes a circular fixing plate, and a shielding mounting protrusion is arranged on the upper side of the circular fixing plate. The unit shielding cover is cylindrical and has radially extending connecting ears inside, and the connecting ears are fixedly connected to the shielding mounting protrusion.

[0014] Furthermore, the unit shielding cover has a length sufficient to cover the upper end of the resistor of the RC unit located at the lower side.

[0015] The above technical solution has the following beneficial effects: the present invention innovatively proposes a resistor-capacitor unit, comprising a lower conductive seat and an upper conductive seat, a capacitor is arranged between the lower conductive seat and the upper conductive seat, a plurality of resistors are arranged around the capacitor, the lower end of the resistor is fixedly connected to the lower conductive seat, and an elastic conductive member is arranged between the upper end of the resistor and the upper conductive seat, which can not only connect the circuit, adjust the assembly tolerance of the resistor and reduce the manufacturing accuracy requirements on the size of the resistor and the capacitor, but also compensate for the vibration of the resistor caused by vibration in new power transmission scenarios such as offshore converter platforms, prevent the resistor from shifting from the initial position or even falling off due to vibration, and avoid failure of the DC voltage transformer.

[0016] A DC voltage transformer comprises a gas-insulated metal enclosure and a high-voltage arm installed in the gas-insulated metal enclosure, wherein the inner cavity of the gas-insulated metal enclosure is used to be filled with insulating gas, the high-voltage arm comprises a resistor-capacitor module, the resistor-capacitor module comprises a plurality of resistor-capacitor units connected in series, the resistor-capacitor units comprise a lower conductive seat and an upper conductive seat, a capacitor is arranged between the lower conductive seat and the upper conductive seat, a plurality of resistors are arranged around the capacitor, the lower end of each resistor is fixedly connected to the lower conductive seat and the upper end is conductively connected to the upper conductive seat via an elastic conductive member.

[0017] Furthermore, a downwardly protruding middle protrusion is provided in the middle of the upper conductive seat, and the elastic conductive member is an L-shaped elastic supporting sheet, one side of which is fixed to the side of the middle protrusion and the other side is fixed to the upper end of the resistor, and the capacitor is mounted on the middle protrusion.

[0018] Furthermore, the upper conductive seat comprises a circular fixing plate, and a connecting protrusion for connecting with the lower side surface of the lower conductive seat of the upper adjacent resistor-capacitor unit is arranged on the upper surface of the circular fixing plate.

[0019] Furthermore, there are multiple connecting protrusions and they are evenly arranged in the circumferential direction.

[0020] Furthermore, a unit shielding cover for shielding the connection position of two adjacent resistor-capacitor units is installed on the upper conductive seat or the lower conductive seat.

[0021] Furthermore, the unit shielding cover is installed on the lower conductive seat, which includes a circular fixing plate, and a shielding mounting protrusion is arranged on the upper side of the circular fixing plate. The unit shielding cover is cylindrical and has radially extending connecting ears inside, and the connecting ears are fixedly connected to the shielding mounting protrusion.

[0022] Furthermore, the unit shielding cover has a length sufficient to cover the upper end of the resistor of the RC unit located at the lower side.

[0023] Furthermore, the lower conductive seat of the RC unit at the lowermost side has a leg structure, an insulating support plate is arranged in the gas-insulated metal enclosure, and the lower conductive seat is mounted on the insulating support plate.

[0024] The above technical scheme has the following beneficial effects: the present invention proposes an improved DC voltage transformer, comprising a gas-insulated metal enclosure, and a high-voltage arm installed in the gas-insulated metal enclosure, the inner cavity of the gas-insulated metal enclosure is used to be filled with insulating gas, the high-voltage arm comprises a resistor-capacitor module, the resistor-capacitor module comprises a plurality of resistor-capacitor units connected in series, the resistor-capacitor unit comprises a lower conductive seat and an upper conductive seat, a capacitor is arranged between the lower conductive seat and the upper conductive seat, a plurality of resistors are arranged around the capacitor, the lower end of the resistor is fixedly connected to the lower conductive seat, and an elastic conductive member is arranged between the upper end of the resistor and the upper conductive seat, which can not only connect the circuit, adjust the assembly tolerance of the resistor and reduce the manufacturing accuracy requirements on the size of the resistor and the capacitor, but also compensate for the vibration of the resistor caused by vibration in new transmission scenarios such as offshore converter platforms, prevent the resistor from shifting from the initial position or even falling off due to vibration, and avoid failure of the DC voltage transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a DC voltage transformer of the present invention; Figure 2 It is a structural schematic diagram of a resistor-capacitor module formed by connecting resistor-capacitor units in series according to the present invention; Figure 3 It is a structural schematic diagram of an embodiment of a resistor-capacitor unit of the present invention; Figure 4 A schematic diagram of the upper conductive seat structure of a resistor-capacitor unit according to an embodiment of the present invention; Figure 5 A schematic diagram of a lower conductive seat structure of a resistor-capacitor unit according to an embodiment of the present invention; Figure 6 The figure is a schematic diagram of another lower conductive seat structure of a resistor-capacitor unit according to an embodiment of the present invention.

[0026] In the figure: 1, high voltage arm; 2, top cover plate; 3, cylinder; 4, lower conductive rod; 5, low voltage side insulator; 6, secondary module box; 7, first low voltage side contact seat; 8, upper conductive rod; 9, basin insulator; 10, insulation support plate; 11, bottom plate; 12, low voltage arm; 110, resistor-capacitor unit; 120, top shielding cover; 130, unit shielding cover; 140, bottom shielding cover; 150, second low voltage side contact seat; 16 0. Lower conductive seat of the lowermost RC unit; 111. Upper conductive seat; 112. L-shaped elastic support sheet; 113. Capacitor; 114. Resistor; 115. Lower conductive seat; 13. Middle protrusion; 14. Upper conductive seat capacitor mounting hole; 15. Connecting protrusion; 16. Shielding mounting protrusion; 17. Lower conductive seat connecting hole; 18. Resistor mounting hole; 19. Lower conductive seat capacitor mounting hole; 161. Leg connecting hole. DETAILED DESCRIPTION

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] The present invention proposes a resistor-capacitor unit, which is connected in series up and down when in use, and includes a lower conductive seat and an upper conductive seat, a capacitor is arranged between the lower conductive seat and the upper conductive seat, a plurality of resistors are arranged around the capacitor, and the lower end of the resistor is fixedly connected to the lower conductive seat. By arranging an elastic conductive part between the upper end of the resistor and the upper conductive seat, not only can the circuit be connected, the assembly tolerance of the resistor be adjusted, and the manufacturing accuracy requirements on the size of the resistor and the capacitor be reduced, but also in new power transmission scenarios such as offshore converter platforms, the vibration of the resistor caused by vibration can be compensated, and the resistor can be prevented from being offset or even falling off from the initial position due to vibration, thereby avoiding failure of the DC voltage transformer.

[0029] Based on the above concept, the present invention provides a variety of different embodiments of DC voltage transformers for illustration.

[0030] In a basic embodiment, Figure 1 As shown, the DC voltage transformer includes a gas-insulated metal enclosure, which includes a cylinder 3, a top cover plate 2, a bottom plate 11, a pot-type insulator 9 and a low-voltage side insulator 5. The bottom plate 11 is fixedly installed at the lower end of the cylinder 3, and a high-voltage arm 1 is fixedly installed inside the cylinder 3. The upper end of the cylinder 3 is fixedly connected to the top cover plate 2. A pot-type insulator 9 is also arranged on one side of the cylinder 3 close to the upper end. The upper end of the high-voltage arm 1 is connected to the central inlay of the pot-type insulator 9 through an upper conductive rod 8. A secondary module box 6 is also arranged on one side of the lower end of the cylinder 3. A low-voltage arm 12 is arranged in the secondary module box 6. A low-voltage side insulator 5 is arranged between the cylinder 3 and the secondary module box 6. A first low-voltage side contact seat 7 is also arranged on the side of the low-voltage side insulator 5 relative to the high-voltage arm 1. The lower end of the high-voltage arm 1 is connected to the first low-voltage side contact seat 7 of the low-voltage side insulator 5 through a lower conductive rod 4.

[0031] like Figure 2 The high-voltage arm 1 shown includes a resistor-capacitor module, which is composed of multiple resistor-capacitor units 110 connected in series. A high-voltage side contact seat is provided at the upper end of the high-voltage arm 1, and a second low-voltage side contact seat 150 at the lower end of the high-voltage arm 1 is coaxially aligned with the lower conductive rod 4, and the high-voltage side contact seat is coaxially aligned with the upper conductive rod 8.

[0032] like Figure 3-6As shown, the RC unit 110 includes a lower conductive seat 115 and an upper conductive seat 111, a capacitor 113 is arranged between the lower conductive seat 115 and the conductive seat 111, a plurality of resistors 114 are arranged around the capacitor 113, the lower end of each resistor 114 is fixedly connected to the lower conductive seat 115 and the upper end is conductively connected to the upper conductive seat 111 through an elastic conductive member, and the capacitor 113 and the plurality of resistors 114 of the same RC unit 110 are connected in parallel.

[0033] On the basis of the above embodiment, the upper conductive seat 111 can be set as a rectangular plate, the four corners of the rectangular plate are set as rounded corners, and the rectangular upper conductive seat 111 is set as a flat plate structure, the upper conductive seat 111 is directly connected to the lower conductive seat 115 of another resistor and capacitor unit 110, and the capacitor 113 is installed in the middle of the upper conductive seat 111. In a preferred embodiment, as Figure 4 As shown, the upper conductive seat 111 includes a circular fixing plate, and a connecting protrusion 15 for connecting to the lower side surface of the lower conductive seat 115 of the upper adjacent resistor-capacitor unit 110 is arranged on the upper surface of the upper conductive seat 111. A downwardly protruding middle protrusion 13 is also arranged in the middle of the upper conductive seat 111, and the capacitor 113 is installed in the upper conductive seat capacitor mounting hole 14 on the middle protrusion 13. In this way, there is a certain distance between each adjacent resistor-capacitor unit 110, and the heat dissipation performance is better.

[0034] On the basis of the above embodiment, the elastic conductive member can be set as a metal spring, one end of which is fixedly connected to the upper end of the resistor 114, and the other end is fixedly connected to the lower side of the upper conductive seat 111. In a preferred embodiment, the elastic conductive member is set as an L-shaped elastic support sheet 112, one side of the L-shaped elastic support sheet 112 is fixed to the side of the middle protrusion 13 set on the upper conductive seat 111, and the other side is fixed to the upper end of the resistor 114.

[0035] On the basis of the above embodiment, the upper conductive seat 111 is connected to the lower side of the lower conductive seat 115 of the upper adjacent RC unit 110, and a plurality of connecting protrusions 15 are arranged on the upper side of the upper conductive seat 111, and the plurality of connecting protrusions 15 are evenly arranged in the circumferential direction, and the number of connecting protrusions 15 can be 5 or 10. In a preferred embodiment, as Figure 4 As shown, eight connecting protrusions 15 are evenly arranged in the circumferential direction, so that the gravity of the entire high-pressure arm 1 can be evenly distributed to achieve a balanced pressure.

[0036] On the basis of the above embodiment, the lower conductive seat 115 includes a fixing plate, which can be set as a rectangular plate, the four corners of the rectangular plate are set as rounded corners, the upper side of the rectangular plate is provided with a shielding mounting protrusion 16, and a plurality of resistors 114 are fixedly mounted on the lower fixing plate 115. In a preferred embodiment, as Figure 5As shown, the fixing plate of the lower conductive seat 115 is circular, and a shielding mounting protrusion 16 is provided on the upper side of the circular fixing plate. Four resistors 114 are provided and fixedly installed at four resistor mounting holes 18 respectively. The lower conductive seat 115 is connected to the upper conductive seat 111 at the lower conductive seat connecting hole 17, and the capacitor 113 is installed at the capacitor mounting hole 19 of the lower conductive seat.

[0037] In a preferred embodiment, Figure 1-2 As shown, a unit shielding cover 130 is disposed between every two adjacent RC units 110 , so as to avoid tip discharge.

[0038] Preferably, Figure 4-6 As shown, the unit shielding cover 130 is arranged on the lower conductive seat 115 and is fixedly connected to the shielding mounting protrusion 16 on the lower conductive seat 115. The bottom shielding cover 140 is arranged on the lower conductive seat 115 of the lowermost resistor-capacitor unit 110. The top shielding cover 120 is arranged on the connecting protrusion 15 of the upper conductive seat 111 of the resistor-capacitor unit 110 on the uppermost side of the high-voltage arm 1. There are four shielding mounting protrusions 16 arranged on the lower conductive seat 115, and they are evenly distributed in the circumferential direction. The top shielding cover 120 is fixedly connected to 4 of the 8 connecting protrusions 15. The unit shielding cover 130, the bottom shielding cover 140 and the top shielding cover 120 are all cylindrical and have radially extending connecting ears inside. The high-voltage side contact seat is arranged on one side of the top shielding cover 120, and the second low-voltage side contact seat 150 is arranged on one side of the bottom shielding cover 140.

[0039] Based on the above embodiment, the lower conductive base 115 of the RC unit 110 at the bottom of the high voltage arm 1 can be configured as follows: Figure 5 The lower conductive base 115 shown is fixedly connected to the insulating support plate 10 disposed on the bottom plate 11 of the DC voltage transformer. In a preferred embodiment, the lower conductive base 160 at the bottom of the RC unit has a leg structure, such as Figure 6 As shown, the lower conductive base 160 of the lowermost RC unit and the insulating support plate 10 are fixedly connected at the leg connection hole 161 .

[0040] The DC voltage transformer of the present invention is used in new power transmission scenarios such as offshore converter platforms. When the DC voltage transformer is subjected to a large vibration from the outside, since the resistor 114 in the RC unit 110 in the DC voltage transformer of the present invention is fixedly mounted on the lower fixed plate 115, and an elastic element, i.e., an L-shaped elastic support sheet 112, is fixedly mounted between the upper end of the resistor 114 and the upper fixed plate 111, the vibration from the outside can be buffered to prevent the resistor 114 from being offset or even falling off from the initial position due to the vibration, thereby avoiding failure of the DC voltage transformer.

[0041] The specific structure of the embodiment of the RC unit of the present invention is consistent with the structure of the RC unit in the above-mentioned DC voltage transformer, and will not be further described herein.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A resistor-capacitor unit, characterized in that: When in use, the upper and lower parts are connected in series. The resistor-capacitor unit includes a lower conductive seat and an upper conductive seat. A capacitor is arranged between the lower conductive seat and the upper conductive seat. A plurality of resistors are arranged around the capacitor. The lower end of each resistor is fixedly connected to the lower conductive seat and the upper end is conductively connected to the upper conductive seat through an elastic conductive member.

2. The resistor-capacitor unit according to claim 1, characterized in that: A downwardly protruding middle protrusion is provided in the middle of the upper conductive seat. The elastic conductive member is an L-shaped elastic supporting sheet, one side of which is fixed to the side of the middle protrusion and the other side is fixed to the upper end of the resistor. The capacitor is installed on the middle protrusion.

3. The resistor-capacitor unit according to claim 2, characterized in that: The upper conductive seat comprises a circular fixing plate, on which a connecting protrusion for connecting with the lower side surface of the lower conductive seat of the upper adjacent resistor-capacitor unit is arranged.

4. The resistor-capacitor unit according to claim 3, characterized in that: There are multiple connecting protrusions which are evenly arranged in the circumferential direction.

5. The resistor-capacitor unit according to any one of claims 1 to 4, characterized in that: A unit shielding cover for shielding the connection positions of two adjacent resistance and capacitance units is installed on the upper conductive seat or the lower conductive seat.

6. The resistor-capacitor unit according to claim 5, characterized in that: The unit shielding cover is installed on the lower conductive seat, which includes a circular fixing plate, and a shielding installation protrusion is arranged on the upper side of the circular fixing plate. The unit shielding cover is cylindrical and has radially extending connecting ears inside, which are fixedly connected to the shielding installation protrusion.

7. The resistor-capacitor unit according to claim 6, characterized in that: The unit shielding cover has a length sufficient to cover the upper end of the resistor of the RC unit located at the lower side.

8. A DC voltage transformer, comprising a gas-insulated metal enclosure and a high-voltage arm installed in the gas-insulated metal enclosure, wherein the inner cavity of the gas-insulated metal enclosure is used to fill insulating gas, the high-voltage arm comprises a resistor-capacitor module, the resistor-capacitor module comprises a plurality of resistor-capacitor units connected in series, characterized in that: The RC unit is the RC unit according to any one of claims 1 to 7.

9. The DC voltage transformer according to claim 8, characterized in that: The lower conductive seat of the resistor-capacitor unit at the lowermost side has a leg structure, an insulating support plate is arranged in the gas-insulated metal closed shell, and the lower conductive seat is mounted on the insulating support plate.

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