Insulation pull rod with voltage sampling function and solid-sealed polar pole

Abstract

The utility model provides an insulating pull rod with voltage sampling and a solid-sealed polar pole, the insulating pull rod with voltage sampling comprises a drawing rod, an insulating shell, a built-in resistor and two conductive plugs, the drawing rod is a tubular structure with a central hole, the built-in resistor is arranged in the central hole of the drawing rod, and the two conductive plugs are arranged in the insulating shell. The two conductive plugs are assembled at the two ends of the center hole of the drawing rod respectively, and the two ends of the built-in resistor are electrically connected with the two conductive plugs respectively. And voltage sampling is transferred to the separable and replaceable insulating pull rod, so that even if the built-in resistor is damaged, only the insulating pull rod needs to be replaced, and the replacement cost is low. Meanwhile, the built-in resistor is stably assembled, so that the size of the insulating pull rod is not increased, and the insulating pull rod is adaptive to an original vacuum arc-extinguishing chamber structure; and the applicability is wider.

Description

Technical Field

[0001] The utility model relates to the field of switchgear, in particular to an insulating pull rod with voltage sampling and a sealed pole. Background Art

[0002] The sealed pole is a key component of outdoor high-voltage vacuum circuit breakers. It is formed by embedding the conductive parts of the vacuum interrupter and circuit breaker simultaneously in a readily curable solid insulating material such as epoxy resin or thermoplastic, making the entire circuit breaker pole a single component. The sealed pole typically also includes an insulating rod, which connects to the moving contact of the vacuum interrupter to drive the moving contact's opening and closing operations.

[0003] Switchgear used outdoors requires voltage sampling for monitoring. Patent application CN113793774A discloses a deep primary-secondary fusion sealed pole, which incorporates a voltage sensor and other sensing components within the vacuum interrupter housing for voltage sampling. This design only applies to the sealed pole itself (i.e., the vacuum interrupter portion), requiring re-evaluation, redesign, and verification of the arc-extinguishing function of the vacuum interrupter portion. This leads to high R&D costs. Furthermore, damage to any internal component renders the vacuum interrupter of the sealed pole unusable, resulting in high replacement costs. Utility Model Content

[0004] Therefore, in order to improve the above-mentioned problem, the present invention provides an insulating pull rod with voltage sampling and a sealed pole.

[0005] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0006] An insulating pull rod with voltage sampling, comprising a pull rod and an insulating shell covering the outside of the pull rod; wherein, it also includes a built-in resistor and two conductive plugs, the pull rod is a tubular structure with a central hole, the built-in resistor is arranged in the central hole of the pull rod, and the two conductive plugs are respectively assembled at the two ends of the central hole of the pull rod, and the two ends of the built-in resistor are respectively electrically connected to the two conductive plugs.

[0007] Furthermore, the length of the pull-out rod is greater than the length of the built-in resistor, one end of the built-in resistor is directly connected to one of the conductive plugs, and the other end is connected to another conductive plug through a conductive wire.

[0008] Furthermore, the central hole of the drawing rod is also filled with an insulating filler.

[0009] Furthermore, the insulating filler is made of silicone.

[0010] Furthermore, an external resistor is included, which is connected to one of the conductive plugs to form a series connection with the built-in resistor.

[0011] Furthermore, the resistance value of the built-in resistor is much greater than the resistance value of the external resistor.

[0012] Furthermore, the sum of the resistance values ​​of the built-in resistor and the external resistor is 100 megohms, and the resistance value of the external resistor is 32.5 kiloohms.

[0013] Furthermore, the conductive plug is a metal plug.

[0014] Furthermore, the insulating shell is a silicone rubber shell, and the insulating shell is provided with a plurality of umbrella skirt structures along its length direction.

[0015] A sealed pole at least comprises the above-mentioned insulating pull rod with voltage sampling function.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] This application incorporates a built-in resistor for voltage sampling on the insulating rod, transferring voltage sampling to the detachable and replaceable insulating rod. Even if the built-in resistor is damaged, simply replace the insulating rod, reducing replacement costs. Furthermore, the lead rod is designed as a tubular structure with a central hole. The built-in resistor is then placed within the central hole of the lead rod and connected via two conductive plugs, achieving a stable assembly without increasing the bulk of the insulating rod, making it compatible with existing vacuum interrupter structures and offering wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows the appearance of the insulating pull rod with voltage sampling in the embodiment;

[0019] Figure 2 The figure shows a schematic diagram of the exploded structure of the insulating pull rod with voltage sampling in the embodiment;

[0020] Figure 3 Shown is a cross-sectional view of an insulating pull rod with voltage sampling in an embodiment;

[0021] Figure 4 The figure shows a schematic structural diagram of an insulating pull rod with voltage sampling when an external resistor is connected in an embodiment. DETAILED DESCRIPTION

[0022] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0023] In the description of the present invention, terms such as "up", "down", "left", "right", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0024] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0025] Reference Figures 1 to 3 As shown, this embodiment provides an insulating pull rod with voltage sampling, including a pull rod 20, an insulating shell 10, a built-in resistor 30, and two conductive plugs 40. The insulating shell 10 covers the outside of the pull rod 20 to provide insulation protection. In this embodiment, the insulating shell 10 is a silicone rubber shell, and the insulating shell 10 is provided with multiple shed structures 11 along its length to increase the creepage distance. The pull rod 20 is a tubular structure with a center hole 21, specifically a circular tube structure in this embodiment. The built-in resistor 30 is disposed in the center hole 21 of the pull rod 20. The two conductive plugs 40 are respectively assembled at both ends of the center hole 21 of the pull rod 20. The two ends of the built-in resistor 30 are respectively electrically connected to the two conductive plugs 40.

[0026] This embodiment also provides a sealed pole, comprising at least the aforementioned insulating rod with voltage sampling. The insulating rod is connected to the moving contact (specifically, the moving conductive rod) of the vacuum interrupter via a conductive plug 40, thereby forming a parallel connection with the load circuit. This allows the voltage of the load circuit to be obtained by sampling the voltage across the built-in resistor 30, thus enabling voltage sampling.

[0027] By transferring voltage sampling to a detachable and replaceable insulating rod, even if the built-in resistor 30 is damaged, simply replace the rod, reducing replacement costs. Furthermore, the draw rod 20 is designed as a tubular structure with a central hole 21. The built-in resistor 30 is then placed within the central hole 21 of the draw rod 20 and connected via two conductive plugs 40. This ensures a stable assembly without increasing the bulk of the insulating rod, making it compatible with existing vacuum interrupter structures and offering wider applicability.

[0028] In this specific embodiment, because the pull rod 20 is longer than the built-in resistor 30, to achieve a better connection, one end of the built-in resistor 30 is directly connected to one of the conductive plugs 40, and the other end is connected to the other conductive plug 40 via a conductive wire 31, ensuring a stable connection. Of course, both ends of the built-in resistor 30 can also be connected to the corresponding conductive plug 40 via a conductive wire 31, and so on, as long as the built-in resistor 30 and two conductive plugs 40 can be connected.

[0029] Furthermore, the conductive plug 40 is preferably made of a metal plug with good conductivity, such as copper or copper alloy.

[0030] Furthermore, in order to make the built-in resistor 30 more stable, in this embodiment, the center hole 21 of the pull-out rod 20 is also filled with an insulating filler, such as silicone (that is, the material of the insulating filler is silicone); after the silicone hardens, the internal components (built-in resistor 30 and conductive wire 31) can be fixed to avoid abnormalities such as unstable connection caused by shaking.

[0031] Since the built-in resistor 30 is located in the center hole 21 of the lead rod 20, and one of the conductive plugs 40 needs to be connected to the movable conductive rod of the vacuum interrupter, the sampling circuit is difficult to layout. Figure 4 As shown, in this embodiment, an external resistor 50 is further provided, and the external resistor 50 is connected to one of the conductive plugs 40 (i.e., the conductive plug 40 that is not connected to the movable conductive rod and is arranged outward), thereby forming a series connection with the built-in resistor 30. Furthermore, the resistance value of the built-in resistor 30 is much greater than the resistance value of the external resistor 50. For example, in this embodiment, the sum of the resistance values ​​of the built-in resistor 30 and the external resistor 50 is 100 megohms, and the resistance value of the external resistor 50 is 32.5 kiloohms. By detecting the voltage value of the external resistor 50, the voltage value of the built-in resistor 30 and the sum of the voltages of the built-in resistor 30 and the external resistor 50 can be obtained; thus, the voltage of the load circuit can be accurately obtained, realizing voltage sampling.

[0032] Furthermore, the resistance value of the built-in resistor 30 is much greater than the resistance value of the external resistor 50 , so that the voltage value allocated to the built-in resistor 30 is much greater than the voltage of the external resistor 50 , thus avoiding potential safety hazards caused by external high voltage.

[0033] Specifically, the external resistor 50 is detachably connected to the conductive plug 40 for easy replacement.

[0034] The above-mentioned method of implementing voltage sensing by providing an external resistor 50 is one of the preferred solutions of the present application. Of course, other embodiments are not limited to this method, such as directly detecting the voltage value of the internal resistor 30 by directly connecting the sampling circuit to the wiring pins extending from the two conductive plugs 40.

[0035] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. An insulating pull rod with voltage sampling, comprising a pull rod and an insulating shell covering the pull rod; characterized in that: It also includes a built-in resistor and two conductive plugs. The pull-out rod is a tubular structure with a central hole. The built-in resistor is arranged in the central hole of the pull-out rod. The two conductive plugs are respectively assembled at the two ends of the central hole of the pull-out rod. The two ends of the built-in resistor are respectively electrically connected to the two conductive plugs.

2. The insulating pull rod with voltage sampling according to claim 1, characterized in that: The length of the pull-out rod is greater than the length of the built-in resistor. One end of the built-in resistor is directly connected to one of the conductive plugs, and the other end is connected to another conductive plug through a conductive wire.

3. The insulating pull rod with voltage sampling according to claim 1, characterized in that: The central hole of the drawing rod is also filled with an insulating filler.

4. The insulating pull rod with voltage sampling according to claim 3, characterized in that: The insulating filler is made of silica gel.

5. The insulating pull rod with voltage sampling according to claim 1, characterized in that: An external resistor is also included, and the external resistor is connected to one of the conductive plugs to form a series connection with the built-in resistor.

6. The insulating pull rod with voltage sampling according to claim 5, characterized in that: The resistance value of the built-in resistor is much greater than the resistance value of the external resistor.

7. The insulating pull rod with voltage sampling according to claim 6, characterized in that: The sum of the resistance values ​​of the built-in resistor and the external resistor is 100 megohms, and the resistance value of the external resistor is 32.5 kiloohms.

8. The insulating pull rod with voltage sampling according to claim 1, characterized in that: The conductive plug is a metal plug.

9. The insulating pull rod with voltage sampling according to claim 1, characterized in that: The insulating shell is a silicone rubber shell, and a plurality of umbrella skirt structures are provided along the length direction of the insulating shell.

10. A sealed pole, characterized in that: At least includes the insulating pull rod with voltage sampling as described in any one of claims 1 to 9.

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