Rear-mounted solid-sealed polar pole for primary and secondary deep fusion switch

Abstract

The utility model relates to a back-mounted solid-sealed polar pole for a primary and secondary deep fusion switch, which adopts a split structure and comprises an insulating shell, a wire outlet rod, a voltage sensor, a vacuum arc-extinguishing chamber and a pull rod assembly, the insulating shell is provided with a first assembly cavity, a second assembly cavity and a wire outlet rod sleeve extending outwards, the wire outlet rod sleeve is communicated with the first assembly cavity, and the voltage sensor is arranged in the second assembly cavity. The vacuum arc-extinguishing chamber and the pull rod assembly are fixedly inserted in the first assembly cavity, the voltage sensor is fixedly inserted in the second assembly cavity, and the wire outlet rod is fixedly inserted in the wire outlet rod sleeve. According to the utility model, each primary element and each secondary element of the pole-mounted switch are integrated, so that integration, miniaturization, digitization and intellectualization of the pole-mounted switch are realized, and deep integration of the primary element and the secondary element is realized. The components are of a split structure and can be quickly assembled and formed after being respectively detected to be qualified, so that the qualification rate of a pole post finished product is ensured, when a certain component is damaged or breaks down, only the corresponding component needs to be replaced, and the pole post product cannot be scrapped.

Description

Technical Field

[0001] The utility model relates to a rear-mounted solid-sealed pole for a primary-secondary deep fusion switch, belonging to the technical field of outdoor pole-mounted switches. Background Art

[0002] With the development of smart grids, equipment integration, miniaturization, digitization, and intelligence are becoming the design trends for power grid products. The traditional primary-secondary boundary is gradually being broken down, with primary equipment integrating many secondary components. The concept of primary-secondary integration is maturing. State Grid has established numerous standards for this integration. The concept of primary-secondary integration for pole-mounted switchgear is characterized by high integration and intelligence, integrating sensors with primary equipment, multiple devices, and multiple functions, ultimately achieving the fusion of primary and secondary components. For example, utility model patent publication number CN220382948U discloses a primary-secondary integrated pole with an integrated power supply design. The pole includes an incoming voltage transformer capacitor and an incoming capacitor-type power supply (PT) installed within the pole; an outgoing voltage and current transformer is mounted externally, with the capacitor-type power supply and the voltage transformer capacitor at a 45° angle. By integrating the capacitor-type power supply with the pole, this pole ensures reliable internal wiring and stable power output, reducing the inconvenience, clutter, and unreliability of external wiring. However, the above technology still belongs to the traditional primary and secondary fusion pole-mounted switchgear. The traditional primary and secondary fusion pole-mounted switchgear has the following defects: (1) Each high-voltage component is independently exposed to the air and is greatly affected by the outside world; the voltage sensor and the current sensor are not integrated with the pole, but only a complete combination of primary and secondary components is realized, and the true "fusion" is not realized. The electrical connection points of the sealed pole, voltage sensor, current sensor and other components have high local discharge; (2) The cost is high and the production efficiency is low. For example, the sealed pole molding, current transformer molding, voltage transformer molding, etc. need to meet the insulation requirements of the ground. , the insulation material used is 2 to 3 times that of the integrated one; (3) the structure is loose, the pole-mounted switchgear is installed on the electric pole, and the weight of the switchgear itself directly affects the difficulty of installation; (4) the voltage sensors and poles of some primary and secondary fusion pole-mounted switchgear are formed in one step (for example, a primary and secondary fusion sealed pole disclosed in the invention patent with publication number CN114512367A). If the step-down arm capacitor is damaged during the pole curing process, the pole will be damaged, the production efficiency is low, and the detection and assembly are difficult; (5) the secondary voltage, current and other signals provided are analog quantities, and secondary conversion is required to realize intelligent digital control. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides a rear-mounted sealed pole for a primary and secondary deep fusion switch. The various components are integrated into one, realizing the primary and secondary deep fusion, and the various components can be assembled after being tested and qualified separately, ensuring the qualified rate of the finished pole product.

[0004] The technical solution for achieving the above-mentioned purpose of the present invention is: a rear-mounted sealed pole for a primary and secondary deep fusion switch adopts a split structure, including an insulating shell, a lead-out rod, a voltage sensor, a vacuum interrupter and a pull rod assembly, the insulating shell is provided with a first assembly cavity, a second assembly cavity and an outwardly extending lead-out rod sleeve, the lead-out rod sleeve is connected to the first assembly cavity, the vacuum interrupter and the pull rod assembly are fixedly inserted in the first assembly cavity, the voltage sensor is fixedly inserted in the second assembly cavity, and the lead-out rod is fixedly inserted in the lead-out rod sleeve.

[0005] The insulating shell is preferably made of epoxy resin through APG process. The insulating shell is usually arranged vertically. The first assembly cavity and the second assembly cavity are opened upward and parallel from the bottom end of the insulating shell. The outlet rod sleeve extends laterally outward from the side wall of the insulating shell.

[0006] Preferably, the axial direction of the outlet rod sleeve is perpendicular to the axial direction of the first assembly cavity.

[0007] Preferably, a coil is coaxially sleeved on the outlet rod sleeve to form a current sensor, and a coil protective layer (silicone rubber protective layer) is formed on the outer side of the coil by APG molding, that is, liquid silicone rubber is used to mold and cover the coil through the APG process to form a composite insulation structure, and the silicone rubber protective layer covers the outlet rod sleeve and part or all of the insulating shell to form an umbrella skirt.

[0008] Preferably, a coil outlet hole is provided on the bonding shell, and the outlet wire of the coil is led out of the pole from the coil outlet hole. The coil outlet hole can be reserved between the coil protective layer and the outer wall of the insulating shell when the coil protective layer is formed.

[0009] Preferably, the inner end of the outlet rod is connected to the moving end (or moving contact) of the vacuum interrupter, and necessary flexible connections are provided.

[0010] Preferably, the outer APG of the outlet rod is formed with a stress cone, the stress cone is in the shape of a cone tube, the tube hole of the outlet rod sleeve is conformal to the stress cone, and the stress cone and the tube hole of the outlet rod sleeve are interference fit.

[0011] Preferably, the stress cone is formed by liquid silicone rubber through an APG process.

[0012] Preferably, the axial length of the stress cone is greater than the length of the outlet rod sleeve. After the outlet rod (with the stress cone) is inserted into the outlet rod sleeve, the axial outer end of the stress cone is flush with the axial outer end of the outlet rod sleeve.

[0013] Preferably, the voltage sensor APG is formed with a packaging shell, the packaging shell is conformal to the second assembly cavity, and there is interference fit between the packaging shell and the second assembly cavity.

[0014] Preferably, the packaging shell is formed by liquid silicone rubber through an APG process.

[0015] Preferably, the voltage sensor adopts a thin film capacitor or a high-voltage ceramic capacitor.

[0016] Preferably, the insulating shell is provided with a through hole coaxially connected to the top of the first assembly cavity (that is, the top of the insulating shell is provided with a through hole coaxially connected to the first assembly cavity), and the top of the vacuum arc chamber is fixed with a stud, which extends outward from the through hole and is fixed by screwing a nut.

[0017] Preferably, a conductive member is fixedly disposed within the through-hole, the conductive member contacting the static end (or static contact) of the vacuum interrupter. A terminal is embedded in the top of the second assembly cavity, and a wire connecting the conductive member and the terminal is disposed within the insulating housing. The wire is typically encapsulated within the insulating housing during molding. The conductive member may be a metal ring.

[0018] Preferably, the voltage sensor is provided with a terminal adapted to be connected to the terminal block, and when the voltage sensor is inserted into the second assembly cavity, the terminal of the voltage sensor is connected to the terminal block.

[0019] The bottom end of the insulating shell is provided with a rubber insulating pad.

[0020] The beneficial effects of the present invention are as follows: the present invention integrates the primary and secondary components of the pole switch into one, realizes the integration, miniaturization, digitization and intelligence of the pole switch, and realizes the deep integration of the primary and secondary; the components of the present invention adopt a split structure, which can be quickly assembled and formed after being tested and qualified, ensuring the qualified rate of the finished pole product. When a component is damaged or fails, only the corresponding component needs to be replaced, and the pole product will not be scrapped; the components are assembled in a plug-in manner on the insulating shell, which is convenient for production and processing, easy for overall product assembly, easy for component replacement, and easy for repair and maintenance; when the insulating shell is formed, there are no electronic components inside, which has high production efficiency and high qualified rate of finished products, and is suitable for assembly line production; the setting of the stress cone has high insulation strength and low partial discharge; the voltage sensor is formed with an encapsulating shell, which improves the insulation strength, makes the electronic components not easily damaged, and can withstand high and low temperature impacts of -40°C to 70°C; the voltage sensor adopts a thin film capacitor or a high-voltage ceramic capacitor, which has small temperature drift and high precision; the current and voltage acquisition quantities are directly converted into digital quantities without the need for secondary conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axial cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION

[0022] All directional indications (such as up, down, top, bottom, inside, outside, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship between the various components in a certain specific posture (as shown in the accompanying drawings) and do not constitute a limitation on the actual use direction. If the specific posture changes, the directional indication will also change accordingly.

[0023] See also Figure 1The utility model discloses a rear-mounted sealed pole for a primary and secondary deep fusion switch, which adopts a split structure and includes an insulating shell 1, a lead-out rod 2, a (incoming and outgoing line side) voltage sensor 3 and a vacuum interrupter and pull rod assembly. The vacuum interrupter and pull rod assembly are mainly composed of a vacuum interrupter 4 and a pull rod 5 connected together. The axial end of the pull rod is connected to the moving end (or moving contact) of the vacuum interrupter. The insulating shell is provided with a first assembly cavity 6, a second assembly cavity 7 and an outgoing lead-out rod sleeve 8 extending outward. The lead-out rod sleeve is communicated with the first assembly cavity. The vacuum interrupter and pull rod assembly are fixedly inserted in the first assembly cavity, the voltage sensor is fixedly inserted in the second assembly cavity, the lead-out rod is fixedly inserted in the lead-out rod sleeve, the inner end of the lead-out rod is connected to the moving end (or moving contact) of the vacuum interrupter, and is provided with necessary soft connections. The outer end of the lead-out rod is connected to the wire incoming terminal (for example, the 10kV wire incoming terminal). The utility model integrates the primary and secondary components of the pole-mounted switch into one, realizing the integration, miniaturization, digitization and intelligence of the pole-mounted switch, and realizing the deep integration of the primary and secondary. Each component adopts a split structure and can be quickly assembled and formed after being tested and qualified, ensuring the qualified rate of the finished pole. When a component is damaged or fails, only the corresponding component needs to be replaced, and the pole product will not be scrapped. Each component adopts a plug-in assembly method on the insulating housing, which is convenient for production and processing, easy to assemble the product as a whole, easy to replace components, and easy to repair and maintain.

[0024] The insulating housing is preferably formed using an epoxy resin APG process. During molding, the housing contains no internal electronic components, resulting in high production efficiency and a high yield rate of finished products, making it suitable for assembly line production. The insulating housing is typically arranged vertically, with the first and second assembly cavities extending upward and parallel from the bottom end of the insulating housing. The outlet rod sleeve extends laterally outward from the sidewalls of the insulating housing. The axial direction of the outlet rod sleeve is preferably perpendicular to the axial direction of the first assembly cavity.

[0025] A coil 9 is preferably coaxially sleeved on the outlet rod sleeve to form a current sensor. A coil protective layer (silicone rubber protective layer) 10 is formed on the outside of the coil by APG molding, that is, liquid silicone rubber is used to mold and cover the coil through the APG process to form a composite insulation structure. The silicone rubber protective layer covers the outlet rod sleeve and part or all of the insulating shell to form an umbrella skirt.

[0026] The bonding shell is preferably provided with a coil outlet hole 11 to facilitate the outlet of the coil. The outlet wire of the coil is led out of the pole from the coil outlet hole. The coil outlet hole can be reserved between the coil protective layer and the outer wall of the insulating shell when the coil protective layer is formed, which is convenient for processing.

[0027] The outer side of the outlet rod is preferably formed with an APG-molded stress cone. The stress cone is formed using liquid silicone rubber using the APG process. The stress cone is conical and tubular, and the bore of the outlet rod casing conforms to the stress cone, with an interference fit between the two. The provision of the stress cone helps to form a uniform electric field, improve insulation capability, and reduce partial discharge.

[0028] The axial length of the stress cone is preferably greater than the length of the outlet rod sleeve. After the outlet rod (with the stress cone) is inserted into the outlet rod sleeve, the axial outer end of the stress cone is flush with the axial outer end of the outlet rod sleeve, and the inner end of the stress cone extends into the first assembly cavity, which can not only ensure stable assembly but also improve insulation capacity.

[0029] The APG voltage sensor is molded into a housing that conforms to the second assembly cavity and provides an interference fit. The housing is preferably molded using liquid silicone rubber using the APG process. This molding process does not strain or squeeze the components. Once inserted into the second assembly cavity, it forms a tight, insulating fit, enhancing insulation strength while ensuring the electronic components are resistant to damage and withstand high and low temperature shocks ranging from -40°C to 70°C. The voltage sensor utilizes a capacitive voltage divider principle. The high-voltage step-down and voltage divider arms preferably utilize thin-film capacitors or high-voltage ceramic capacitors, which minimize temperature drift and provide high accuracy. A shielding cover (or screen) is preferably placed over the voltage sensor to help reduce partial discharge.

[0030] The insulating housing is provided with a through-hole coaxially connected to the top of the first assembly cavity. Specifically, the top of the insulating housing is provided with a through-hole coaxially connected to the first assembly cavity. A stud 12 extending upward is fixed to the top of the vacuum interrupter. The stud extends outward (upward) from the through-hole and is screwed in place with a nut 13. The bottom end of the pull rod extends downward from the first assembly cavity. A conductive member is fixed within the through-hole, contacting the static end (or static contact) of the vacuum interrupter. A terminal is embedded in the top of the second assembly cavity. A wire 14 connecting the conductive member and the terminal is provided within the insulating housing. The wire is typically encapsulated within the insulating housing during molding. The conductive member can be a metal ring.

[0031] The voltage sensor is provided with a terminal adapted to be connected to the terminal block. When the voltage sensor is inserted into the second assembly cavity, the terminal of the voltage sensor is connected to the terminal block.

[0032] The bottom end of the insulating shell is provided with a rubber insulating pad 15 to improve insulation performance and ensure safety. The rubber insulating pad seals the first assembly cavity and the second assembly cavity and is provided with a through hole for the bottom end of the pull rod to pass through.

[0033] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different technical solutions.

Claims

1. The rear-mounted solid-sealed pole for primary and secondary deep fusion switches is characterized by It adopts a split structure, including an insulating shell, a lead-out rod, a voltage sensor, a vacuum interrupter and a pull rod assembly. The insulating shell is provided with a first assembly cavity, a second assembly cavity and a lead-out rod sleeve extending outward. The lead-out rod sleeve is connected to the first assembly cavity. The vacuum interrupter and the pull rod assembly are fixedly inserted in the first assembly cavity, the voltage sensor is fixedly inserted in the second assembly cavity, and the lead-out rod is fixedly inserted in the lead-out rod sleeve.

2. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that The axial direction of the outlet rod sleeve is perpendicular to the axial direction of the first assembly cavity.

3. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that A coil is coaxially sleeved on the outlet rod sleeve, and a coil protection layer is formed on the outer side of the coil.

4. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that The inner end of the outlet rod is connected to the moving end of the vacuum interrupter.

5. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that The outer APG of the outlet rod is formed with a stress cone, and the stress cone is in the shape of a cone tube. The tube hole of the outlet rod sleeve conforms to the stress cone, and the stress cone and the tube hole of the outlet rod sleeve are interference fit.

6. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that The voltage sensor APG is formed with a packaging shell, the packaging shell conforms to the second assembly cavity, and the packaging shell and the second assembly cavity are interference-fitted.

7. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that The voltage sensor adopts a film capacitor or a high-voltage ceramic capacitor.

8. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 1 is characterized in that The insulating housing is provided with a through hole coaxially connected to the top of the first assembly cavity, and a stud is fixed on the top of the vacuum interrupter. The stud extends outward from the through hole and is fixed by a nut.

9. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 8, characterized in that A conductive member is fixed in the through hole and contacts the static end of the vacuum interrupter. A terminal is embedded in the top of the second assembly cavity. A wire connecting the conductive member and the terminal is provided in the insulating housing.

10. The rear-mounted sealed pole for the primary and secondary deep fusion switch according to claim 9, characterized in that The voltage sensor is provided with a connection terminal suitable for connecting with the connection terminal.

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