Resistance-capacitance voltage divider and electronic voltage transformer

Abstract

The utility model belongs to the technical field of high voltage measuring devices, and discloses a resistance-capacitance voltage divider and an electronic voltage transformer, the resistance-capacitance voltage divider comprises an insulation support cylinder, a resistance-capacitance voltage dividing plate is arranged in the insulation support cylinder, the resistance-capacitance voltage dividing plate comprises a PCB circuit board, a plurality of passive element modules are fixed on the PCB circuit board, and the passive element modules are fixed on the insulation support cylinder. The passive element module is covered with a resistance welding spot shielding block, the top of the insulating supporting cylinder is provided with a high-voltage end wiring terminal, the bottom of the insulating supporting cylinder is provided with a base with a through hole, one end of the passive element module is electrically connected with the high-voltage end wiring terminal, and the other end of the passive element module is electrically connected with a coaxial cable signal wire penetrating out of the base; arc-shaped notches are formed in the two sides of the PCB. According to the utility model, the resistance welding spot shielding block is arranged on the resistance-capacitance voltage-dividing plate, so that the partial discharge of the high-voltage arm is reduced, the stability is improved, and the used space is reduced by arranging the resistance-capacitance voltage-dividing plate in the insulating support cylinder.

Description

A resistive-capacitive voltage divider and an electronic voltage transformer Technical Field

[0001] This utility model belongs to the technical field of high voltage measuring devices, specifically relating to a resistive-capacitive voltage divider and an electronic voltage transformer. Background Technology

[0002] DC voltage transformers, as measuring devices for DC voltage in DC systems, play a crucial role in ensuring the safe and stable operation of DC transmission systems. Resistive-capacitive voltage dividers, acting as sensors, are used in the high-voltage arm of DC voltage transformers. Existing open-type RC voltage dividers use a high-temperature insulating casting method to solidify series-connected resistors onto the wall of an insulating support tube. This open-type RC voltage divider is bulky and difficult to integrate into GIS equipment. Electromagnetic voltage transformers used with GIS have large internal coils, requiring a variable-diameter housing, resulting in a large product size. Existing detachable AC / DC voltage dividers consist of a high-voltage arm unit composed of a resistor assembly and an isolation support assembly. The resistor assembly consists of resistors fixed to an insulating support barrel, with inner flanges at both ends. If used in sections, these sections need to be connected with metal flanges. However, these metal flanges are electromagnetically suspended, and after a period of energized use, charge accumulation can easily occur on these suspended metal flanges, leading to partial discharge.

[0003] Chinese patent publication number CN108181493A, entitled "A Zero-Sequence Voltage Sensor with Resistor-Capacitor Divider," includes an A-phase resistor-capacitor divider, a B-phase resistor-capacitor divider, a C-phase resistor-capacitor divider, and a secondary adjustment and protection unit. The A-phase resistor-capacitor divider is composed of the impedances of the A-phase high-voltage arm and the A-phase low-voltage arm connected in series. The B-phase resistor-capacitor divider is also composed of the impedances of the B-phase high-voltage arm and the B-phase low-voltage arm connected in series. The C-phase resistor-capacitor divider is composed of the impedances of the A-phase high-voltage arm and the C-phase low-voltage arm connected in series. The secondary adjustment and protection unit is composed of an adjustment resistor, an adjustment capacitor, a discharge tube, and a varistor connected in parallel. The low-voltage arm impedances of each phase and the secondary adjustment and protection unit are connected in parallel to form a low-voltage dividing impedance, which outputs a zero-sequence voltage value. This patent application fails to address the following problems: the high-voltage arm is prone to partial discharge, the high-voltage arm is susceptible to external environmental influences, and it occupies a large space. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the purpose of this utility model is to provide a resistive-capacitive voltage divider and an electronic voltage transformer. By setting a resistance solder joint shielding block on the resistive-capacitive voltage divider plate, the partial discharge of the high-voltage arm is reduced and the stability is improved. By setting the resistive-capacitive voltage divider plate in an insulating support cylinder, the space used is reduced.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, this utility model provides a resistive-capacitive voltage divider, comprising: an insulating support cylinder, wherein a resistive-capacitive voltage divider plate is disposed in the insulating support cylinder, the resistive-capacitive voltage divider plate includes a PCB circuit board, a plurality of passive component modules are fixed on the PCB circuit board, a resistance solder joint shielding block is covered on the passive component modules, a high-voltage terminal is disposed at the top of the insulating support cylinder, and a base with a through hole is disposed at the bottom, one end of the passive component module is electrically connected to the high-voltage terminal, and the other end is electrically connected to a coaxial cable signal line passing through the base; and arc-shaped notches are provided on both sides of the PCB circuit board.

[0007] Optionally, multiple passive component modules are staggered on both sides of the PCB circuit board, and the arc-shaped notch is formed between two adjacent passive component modules on the same side of the PCB circuit board; both ends of the passive component module are electrically connected to two adjacent passive component modules on the opposite side.

[0008] Optionally, each end of the passive component module is electrically connected to two adjacent passive component modules on the opposite side through a passive component module.

[0009] Optionally, an intermediate potential shield is provided on the outer side of the middle part of the insulating support cylinder.

[0010] Optionally, the intermediate potential shield is an annular shield, with the top and bottom of the intermediate potential shield being raised arc surfaces, and the raised side of the arc surface facing away from the insulating support cylinder.

[0011] Optionally, the intermediate potential shield is electrically connected to the PCB circuit board of the resistor-capacitor voltage divider via a wire.

[0012] Optionally, a cable connector is connected to the bottom of the resistor-capacitor voltage divider, and a through hole is provided in the cable connector. The coaxial cable signal line passes through the through hole of the cable connector and is electrically connected to the resistor-capacitor voltage divider.

[0013] Optionally, the cable connector is inserted into a resistor-capacitor voltage divider fixing groove, the bottom of the resistor-capacitor voltage divider fixing groove is connected to the base, and the resistor-capacitor voltage divider fixing groove has a through hole.

[0014] Optionally, the side of the resistance solder joint shielding block is provided with a groove communicating with the bottom, the passive component module is soldered on the PCB circuit board, the top surface of the groove is parallel to the PCB circuit board, and the solder joint of the passive component module is located between the top surface of the groove and the PCB circuit board.

[0015] Secondly, this utility model provides an electronic voltage transformer, including a resistive-capacitive voltage divider, a high-voltage arm, a metal-sealed terminal block, and a low-voltage arm. The high-voltage arm is connected to the high-voltage terminal block, and the coaxial cable signal line passes through the metal-sealed terminal block and is connected to the low-voltage arm.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model discloses a resistive-capacitive voltage divider and an electronic voltage transformer. By designing an arc-shaped notch on the resistive-capacitive voltage divider plate, the creepage distance between adjacent resistive and capacitive components is increased. By setting a resistance solder joint shielding block on the resistive-capacitive voltage divider plate, the partial discharge of the high-voltage arm is reduced, and the stability is improved.

[0018] Furthermore, the intermediate potential shield of this invention is fixed in the middle position of the outer wall of the insulating support cylinder, which can improve the electric field, enhance insulation, and prevent the high-voltage arm from being affected by the external environment.

[0019] Furthermore, in signal transmission systems, due to the low voltage of the transmitted signal, it is easily interfered with by other electronic components. In order to reduce signal interference, this invention protects the analog signal transmitted by connecting the signal line at the end of the high-voltage arm to the coaxial cable signal line and then inputting it to the low-voltage arm through a metal-sealed terminal block.

[0020] Furthermore, the voltage potential of the high-voltage arm connected to the resistive-capacitive voltage divider of this invention gradually decreases from the high-voltage end to the low-voltage end, and it has a coaxial electrode structure with the insulating cylinder. This allows the voltage potential of the equipment to decrease uniformly from the high-voltage end to the low-voltage end, improving the potential distribution and providing insulation performance. Compared to electromagnetic and capacitive voltage transformers used with metal-enclosed gas-insulated switches, this invention integrates the resistive-capacitive voltage divider into the metal-enclosed gas-insulated switch, providing ample electrical insulation space. The cylindrical structure of the insulating support cylinder reduces the space required. Attached Figure Description

[0021] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the present invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0022] Figure 1 is a schematic diagram of the resistive-capacitive voltage divider structure of this utility model;

[0023] Figure 2 is a partial enlarged view of point A in Figure 1 of this utility model;

[0024] Figure 3 is a schematic diagram of the resistive-capacitive pressure divider structure of this utility model;

[0025] Figure 4 is a partial enlarged view of section B in Figure 3 of this utility model;

[0026] The components include: 1. High-voltage terminal block; 2. Insulating support cylinder; 3. RC voltage divider plate; 31. PCB circuit board; 311. Arc-shaped notch; 32. Passive component module; 33. Resistance solder joint shielding block; 331. Groove; 332. Connecting platform; 4. Intermediate potential shielding cover; 41. Wire; 5. Cable connector; 51. First hollow shaft; 52. Second hollow shaft; 6. RC voltage divider plate fixing groove; 61. Sleeve; 62. Extension plate; 7. Base; 8. Coaxial cable signal line; 9. Metal-sealed terminal block; 10. Low-voltage arm. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] When an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments. The use of the term "horizontal" does not imply that the component is required to be absolutely horizontal, but rather that it may be slightly tilted. "Horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] The present invention will now be described in detail with reference to the accompanying drawings.

[0034] As shown in Figure 1, the present invention provides a resistive-capacitive voltage divider, comprising: an insulating support cylinder 2, wherein a resistive-capacitive voltage divider plate 3 is disposed in the insulating support cylinder 2, the resistive-capacitive voltage divider plate 3 includes a PCB circuit board 31, wherein a plurality of passive component modules 32 are fixed on the PCB circuit board 31, and a resistance solder joint shielding block 33 covers the passive component modules 32; a high-voltage terminal 1 is disposed at the top of the insulating support cylinder 2, and a base 7 with a through hole is disposed at the bottom; one end of the passive component module 32 is electrically connected to the high-voltage terminal 1, and the other end is electrically connected to a coaxial cable signal line 8 passing through the base 7; and arc-shaped notches 311 are provided on both sides of the PCB circuit board 31.

[0035] The arc-shaped notch 311 of this invention increases the creepage distance between adjacent resistors and capacitors; by setting a resistance solder joint shielding block 33 on the resistor-capacitor voltage divider 3, the partial discharge of the high-voltage arm is reduced and the stability is improved.

[0036] In the signal transmission system, because the voltage of the transmitted signal is low, it is easily interfered with by other electronic components. In order to reduce signal interference, the signal line at the end of the high-voltage arm is connected to the coaxial cable signal line 8, and then input to the low-voltage arm 10 through the metal-sealed terminal block to protect the transmitted analog signal.

[0037] Example

[0038] The specific embodiments of this utility model will be further described below with reference to Figure 1.

[0039] include:

[0040] 1. High-voltage terminal block; 2. Insulating support cylinder; 3. RC voltage divider plate; 4. Intermediate potential shield; 5. Cable connector; 6. RC voltage divider plate fixing groove; 7. Base; 8. Coaxial cable signal line; 9. Metal-sealed terminal block; and 10. Low-voltage arm.

[0041] The resistor-capacitor voltage divider is used in electronic voltage transformers for GIS (Gas Insulation System) applications and can be used for single-phase and three-phase applications.

[0042] The high-voltage terminal 1 and the base 7 are respectively fixed to both ends of the insulating support cylinder 2 by fasteners. Optionally, the fasteners are bolts.

[0043] The high-voltage terminal block 1, the insulating support cylinder 2, and the base 7 form an integrated insulating support structure, thereby fixing the insulating support cylinder 2 between the high and low voltage insulators inside the GIS transformer chamber.

[0044] The RC voltage divider 3 is installed inside the insulating support cylinder 2, and the insulating support cylinder 2 protects the RC voltage divider 3.

[0045] Optionally, the high-voltage terminal 1 and the base 7 are respectively provided with insertion slots that match the top and bottom of the resistor-capacitor voltage divider 3.

[0046] The resistor-capacitor voltage divider 3 includes a PCB circuit board 31, a passive component module 32, and a resistor solder joint shielding block 33. The passive component module 32 and the resistor solder joint shielding block 33 are both fixed on the PCB circuit board 31.

[0047] Specifically, the two ends of the passive component module 32 are fixed to the PCB circuit board 31 by soldering. The soldering point is called the solder joint. Since the solder joint is a raised part, it is easy to generate small burrs, which may cause partial discharge during operation. Therefore, it should also be shielded and protected.

[0048] To address partial discharge at the solder joint locations, resistance solder joint shielding blocks 33 were installed at the solder joint locations and symmetrically fixed to both sides of the PCB circuit board 31 via bolt connections. This reduces the electric field strength of the high-voltage arm, improves insulation, and prevents the high-voltage arm from being affected by the external electromagnetic environment, thus making the equipment operation more stable.

[0049] Optionally, the PCB circuit board 31 is a rectangular board with arc-shaped notches 311 on both sides. By creating arc-shaped structures between the solder joints of the passive component modules 32, the creepage distance between the passive component modules 32 can be increased, and the electric field strength can be reduced.

[0050] Optionally, the passive component module 32 is a capacitor module or a resistor module.

[0051] The passive component module 32 is soldered to both sides of the PCB circuit board 31 via pins at both ends. Specifically, the multiple passive component modules 32 are arranged in a Z-shape.

[0052] The outer surface of the resistance solder joint shielding block 33 is a smooth aluminum surface. The smooth curved surface can effectively reduce partial discharge and play a shielding role.

[0053] The resistance solder joint shielding block 33 is a long strip plate. The side of the resistance solder joint shielding block 33 has a groove 331, which is used to wrap the solder joint and the passive component lead. The passive component module 32 is located below the groove 331. The solder joint of the passive component module 32 is located within the projection range of the groove 331 of the resistance solder joint shielding block 33 on the PCB circuit board 31.

[0054] A connecting platform 332 is provided in the middle of the groove 331. A through hole is provided on the end face of the connecting platform 332. By installing bolts for fixing at the through hole, the resistance solder shield block 33 can be fixed on the PCB circuit board 31. The purpose of this design is to adapt to the connection and arrangement requirements of the passive component module 32 of the high voltage arm.

[0055] Optionally, the intermediate potential shield 4 is connected to the insulating support cylinder 2 by fasteners.

[0056] Preferably, the intermediate potential shield 4 is bolted to the middle of the side of the insulating support cylinder 2. Partial discharge is strongest in the middle of the voltage divider, making it prone to electrical breakdown; therefore, an intermediate potential shield 4 is needed in the middle.

[0057] The intermediate potential shield 4 of this invention is fixed in the middle position of the outer wall of the insulating support cylinder 2, which can improve the electric field, enhance insulation, and prevent the high voltage arm from being affected by the external environment.

[0058] Specifically, the intermediate potential shield 4 is an annular shield, with its top and bottom raised and its middle part connected to the insulating support cylinder 2 by fasteners.

[0059] Furthermore, the top and bottom of the intermediate potential shield 4 are both arc surfaces, and the convex side of the arc surface faces away from the insulating support cylinder 2, which helps to reduce the amount of partial discharge; the smooth arc surface helps to reduce the electric field strength during operation.

[0060] The intermediate potential shield 4 is electrically connected to the PCB circuit board 31 of the resistor-capacitor voltage divider 3 via a wire 41, which can achieve the effect of equalizing the intermediate potential, reducing partial discharge, and improving the stability of operation.

[0061] Specifically, the upper end of the high-voltage terminal 1 has a protruding cylinder, which serves as an insertion structure for connection to the high-voltage side of the transformer. The lower end of the high-voltage terminal 1 has a concave cavity, which matches the top of the resistor-capacitor voltage divider 3, and is used to cover the top of the resistor-capacitor voltage divider 3 inside the high-voltage terminal 1 to produce a shielding effect.

[0062] Specifically, the cable connector 5 is an insert-type vertical coaxial cable connector.

[0063] The bottom of the resistor-capacitor voltage divider 3 is fixedly connected to the cable connector 5. The cable connector 5 is inserted into the resistor-capacitor voltage divider fixing slot 6. The resistor-capacitor voltage divider fixing slot 6 is fixed on the base 7. Fixing the cable connector 5 to the resistor-capacitor voltage divider fixing slot 6 of the base 7 can ensure that the signal output by the cable connector 5 is not subject to external electromagnetic interference, and can also provide a fixed support for the circuit board 3.

[0064] The base 7 has a through hole, and the resistor-capacitor pressure divider plate fixing groove 6 includes a sleeve 61. The bottom of the sleeve 61 has an extension plate 62, and the extension plate 62 of the resistor-capacitor pressure divider plate fixing groove 6 is connected to the base 7 by fasteners. Specifically, the fasteners are bolts.

[0065] The cable connector 5 includes a first hollow shaft 51 and a second hollow shaft 52. The first hollow shaft 51 has a first through hole extending along its axial direction, and the second hollow shaft 52 has a second through hole extending along its axial direction. The first through hole and the second through hole are connected.

[0066] Optionally, the first hollow shaft 51 and the second hollow shaft 52 are vertically connected. The first hollow shaft 51 of the cable connector 5 is inserted into the sleeve 61 of the resistor-capacitor voltage divider plate fixing groove 6. The second hollow shaft 52 is fixed to the PCB circuit board 31 by welding.

[0067] Example 2

[0068] This embodiment provides an electronic voltage transformer, including a resistive-capacitive voltage divider, a high-voltage arm, a metal-sealed terminal block 9, and a low-voltage arm 10. The high-voltage arm is connected to the high-voltage terminal block 1, and the coaxial cable signal line 8 passes through the metal-sealed terminal block 9 and is connected to the low-voltage arm 10.

[0069] Specifically, one end of the coaxial cable signal line 8 passes through the through hole of the base 7, the sleeve 61 of the resistor-capacitor voltage divider plate fixing groove 6, the first through hole and the second through hole of the cable connector 5, and is connected to the resistor-capacitor voltage divider plate 3; the other end passes through the metal sealing terminal plate 9 and is connected to the low-voltage arm 10.

[0070] Specifically, the metal-sealed terminal block 9 is installed between the coaxial cable signal line 8 and the low-voltage arm 10. The metal-sealed terminal block 9 serves to shield and protect the output analog signal and reduce interference.

[0071] This invention relates to a resistor-capacitor voltage divider for dividing AC and DC voltage signals, utilizing the frequency characteristics of resistors and capacitors to achieve the voltage division function. As the voltage increases, the electric field strength on the outer surface of the high-voltage arm and at the solder joints of the resistors and capacitors is high, easily leading to partial discharge. The analog signal output from the end of the high-voltage arm is easily affected by the electric field, especially when the system disconnect switch is opened or closed, causing a rise in the ground potential of the metal casing, resulting in VFTO (Very Fast Transient Overvoltage), which greatly interferes with the transmitted signal. This invention can solve the problems of partial discharge in the high-voltage arm and interference suppression in the transmitted signal.

[0072] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A resistor-capacitor voltage divider, characterized by include: An insulating support cylinder (2) is provided with a resistor-capacitor voltage divider plate (3). The resistor-capacitor voltage divider plate (3) includes a PCB circuit board (31). Several passive component modules (32) are fixed on the PCB circuit board (31). A resistance solder joint shielding block (33) covers the passive component modules (32). A high-voltage terminal (1) is provided at the top of the insulating support cylinder (2), and a base (7) with a through hole is provided at the bottom. One end of the passive component module (32) is electrically connected to the high-voltage terminal (1), and the other end is electrically connected to a coaxial cable signal line (8) that passes through the base (7). Arc-shaped notches (311) are provided on both sides of the PCB circuit board (31).

2. A resistor-capacitor voltage divider according to claim 1, characterized in that Multiple passive component modules (32) are staggered on both sides of the PCB circuit board (31), and the arc-shaped notch (311) is opened between two adjacent passive component modules (32) on the same side of the PCB circuit board (31); both ends of the passive component module (32) are electrically connected to the two adjacent passive component modules (32) on the opposite side respectively.

3. A resistor-capacitor voltage divider as defined in claim 2, characterized in that Both ends of the passive component module (32) are electrically connected to two adjacent passive component modules (32) on the opposite side through one passive component module (32).

4. A resistive-capacitive voltage divider according to claim 1, characterized in that, An intermediate potential shield (4) is provided on the outer side of the middle part of the insulating support cylinder (2).

5. A resistor-capacitor voltage divider according to claim 4, characterized in that The intermediate potential shield (4) is an annular shield. The top and bottom of the intermediate potential shield (4) are raised arc surfaces, and the raised side of the arc surface faces away from the insulating support cylinder (2).

6. A resistive-capacitive voltage divider according to claim 4, characterized in that, The intermediate potential shield (4) is electrically connected to the PCB circuit board (31) of the resistor-capacitor voltage divider (3) via a wire (41).

7. A resistor-capacitor voltage divider as defined in claim 1, wherein, The bottom of the resistor-capacitor voltage divider (3) is connected to a cable connector (5), and a through hole is provided in the cable connector (5). The coaxial cable signal line (8) passes through the through hole of the cable connector (5) and is electrically connected to the resistor-capacitor voltage divider (3).

8. A resistor-capacitor voltage divider according to claim 7, characterized in that The cable connector (5) is inserted into and connected to the resistor-capacitor voltage divider fixing groove (6). The bottom of the resistor-capacitor voltage divider fixing groove (6) is connected to the base (7). The resistor-capacitor voltage divider fixing groove (6) has a through hole.

9. A resistor-capacitor voltage divider as defined in claim 1, wherein, The resistance solder shield block (33) has a groove (331) on its side that communicates with the bottom. The passive component module (32) is soldered on the PCB circuit board (31). The top surface of the groove (331) is parallel to the PCB circuit board (31). The solder joint of the passive component module (32) is located between the top surface of the groove (331) and the PCB circuit board (31).

10. An electronic voltage transformer, characterized in that, The device includes a resistor-capacitor voltage divider as described in any one of claims 1 to 9, a high-voltage arm, a metal-sealed terminal block (9), and a low-voltage arm (10), wherein the high-voltage arm is connected to the high-voltage terminal block (1), and the coaxial cable signal line (8) passes through the metal-sealed terminal block (9) and is connected to the low-voltage arm (10).

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