An integrated deep fusion solid-sealed pole structure suitable for 20kV and above

Abstract

The utility model discloses an integrated depth fusion solid seal pole structure suitable for 20kV and above, including insulating casing, incoming line terminal, outgoing line terminal and set up in the arc-extinguishing chamber of insulating casing, the static contact side of arc-extinguishing chamber is connected incoming line terminal through incoming line rod, and the movable contact of arc-extinguishing chamber connects movable contact finger ring, the recess is set up in movable contact finger ring outer wall, and spring contact finger is set up in recess, and the static contact finger ring is fixed in insulating casing, and static contact finger ring is sleeved in movable contact finger ring recess, and spring contact finger and static contact finger ring slide fit, and static contact finger ring is connected outgoing line terminal through outgoing line rod, movable contact finger ring, arc-extinguishing chamber dynamic end and insulating pull rod are fixedly connected through screw thread. On the function satisfies the requirement of traditional primary and secondary fusion solid seal pole, and simultaneously has made the brand -new design in high voltage partial discharge, endures outdoor extreme temperature condition etc. aspect, has made the comparatively big promotion in electrical performance and reliability etc. aspects.

Description

Technical Field

[0001] This utility model relates to medium-voltage switchgear, specifically to an integrated, deeply fused, solid-sealed pole structure suitable for 20kV and above. Background Technology

[0002] Outdoor primary and secondary integrated solid-sealed terminals are highly integrated units comprising a primary conductor, arc-extinguishing device, insulator, and acquisition sensor. They are functional components integrating conductivity, arc extinguishing, and signal acquisition. Conventional primary and secondary integrated solid-sealed terminals above 20kV often employ a secondary potting process to pot the voltage sampling sensor, and the primary flexible conductive connection typically uses a soft connection structure. Their capacitors are primarily organic thin-film dielectric capacitors. After the above components are assembled, the overall system exhibits significant problems in areas such as partial discharge and resistance to extreme outdoor temperature conditions.

[0003] The main drawbacks are as follows:

[0004] 1. Low partial discharge arc extinguishing voltage: Traditional electrode posts use pre-installed voltage sensors. There is an assembly gap between the sensor body and the pre-installed cavity of the solid electrode post. This gap has different discharge characteristics under different temperature and humidity conditions, which has a certain impact on the overall electrical performance of the electrode post.

[0005] 2. Unstable temperature and weather resistance characteristics of capacitors: Traditional solid-sealed terminals use thin-film capacitors made of organic materials as the capacitor dielectric. They are prone to aging and other problems under high and low temperature, overvoltage and other environments, which will have a certain impact on their accuracy and insulation strength over a long period of time. Utility Model Content

[0006] Purpose of the utility model: In view of the above-mentioned shortcomings, this utility model provides an integrated, deeply fused, solid-sealed pole structure suitable for 20kV and below, which improves electrical performance and reliability.

[0007] Technical Solution: To solve the above problems, this utility model adopts an integrated deep-fusion solid-sealed pole structure suitable for 20kV and above, including an insulating shell, an inlet terminal, an outlet terminal, and an arc-extinguishing chamber disposed within the insulating shell. The stationary contact of the arc-extinguishing chamber is connected to the inlet terminal via an inlet rod, and the moving contact of the arc-extinguishing chamber is connected to a moving contact ring. A groove is provided on the outer wall of the moving contact ring, and a spring contact finger is disposed within the groove. A stationary contact ring is fixed inside the insulating shell, and the stationary contact ring is sleeved on the outside of the moving contact ring, with the spring contact finger slidingly contacting the stationary contact ring. The stationary contact ring is connected to the outlet terminal via an outlet rod, and the moving contact ring is fixedly connected to an insulating pull rod.

[0008] Furthermore, the inlet rod connects to the inlet-side voltage sensor, and the guide ring connects to the outlet-side voltage sensor. The inlet-side and outlet-side voltage sensors are embedded within an insulating housing using a single encapsulation process. The bottom of the insulating housing is provided with an inlet voltage divider plate mounting hole, an outlet voltage divider plate mounting hole, and an annular sealing hole. An inlet bolt is installed in the inlet voltage divider plate mounting hole, an outlet bolt is installed in the outlet voltage divider plate mounting hole, and a sealing ring is installed in the annular sealing hole. A voltage sensor voltage divider plate is connected to the bottom of the insulating housing. The voltage sensor voltage divider plate includes an inlet voltage divider plate and an outlet voltage divider plate. Each plate is equipped with a voltage divider circuit. A sealing ring is located between the voltage sensor voltage divider plate and the insulating housing for sealing between the voltage sensor voltage divider plate and the insulating housing. The inlet bolt is connected to the low-voltage side of the inlet voltage sensor, and the outlet bolt is connected to the low-voltage side of the outlet voltage sensor. The inlet voltage divider plate includes a first contact corresponding to the inlet voltage divider plate mounting hole, and the outlet voltage divider plate includes a second contact corresponding to the outlet voltage divider plate mounting hole. The voltage divider circuit of the inlet voltage divider plate is electrically connected to the inlet bolt through the first contact, and the voltage divider circuit of the outlet voltage divider plate is electrically connected to the outlet bolt through the second contact.

[0009] Furthermore, an equalizing ring is provided below the stationary touch finger ring and embedded in the insulating shell. The bottom of the equalizing ring is rolled outward and the upper end of the equalizing ring is in close contact with the stationary touch finger ring.

[0010] Furthermore, the input-side voltage sensor includes three capacitor groups connected in series, and the output-side voltage sensor includes three capacitor groups connected in series.

[0011] Furthermore, both the input-side voltage sensor and the output-side voltage sensor employ ceramic capacitors.

[0012] Furthermore, it also includes a current sensor, which has a ring structure and surrounds the outside of the outlet rod. The current sensor is led out through a low-voltage side lead.

[0013] Furthermore, the insulating housing includes an epoxy resin layer and a silicone layer sleeved on the outside of the epoxy resin layer. The insulating housing at the current sensor mounting location has a process hole, within which a fixing process plate is installed. The current sensor and the silicone layer are fixed together by the fixing process plate. The silicone layer has a skirt.

[0014] Furthermore, an inner cavity is provided within the insulating housing, and an insulating pull rod is installed within the inner cavity. One end of the insulating pull rod is connected to the movable contact finger ring, and the other end is connected to the contact spring guide rod. The other end of the contact spring guide rod is connected to the contact spring pressure rod, and the other end of the contact spring pressure rod is connected to the overtravel connecting rod. A contact spring is sleeved on the contact spring guide rod. An insulating sleeve is sleeved on the outside of the contact spring, and one end of the insulating sleeve is fixedly connected to the insulating pull rod.

[0015] Beneficial effects: Compared with the prior art, the advantages of this utility model are that by adopting an integrated encapsulation structure and using a high-temperature resistant series ceramic capacitor bank as a voltage acquisition device, it meets the functional requirements of traditional primary and secondary fusion solid-sealed poles. At the same time, it has made new designs in terms of partial discharge, resistance to extreme outdoor temperature conditions, sliding conductive connection of the moving end of the arc extinguishing chamber, and capacitor dielectric form, and has made significant improvements in electrical performance and reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the solid-sealed pole of this utility model.

[0017] Figure 2 This is a cross-sectional view of the solid-sealed pole of this utility model.

[0018] Figure 3 This is a first cross-sectional view of the solid-sealed pole removing the insulating pull rod of this utility model.

[0019] Figure 4 This is a second sectional view of the solid-sealed pole removing the insulating pull rod of this utility model.

[0020] Figure 5 This is a bottom view of the solid-sealed pole of this utility model.

[0021] Figure 6 This is a cross-sectional view of the insulating tie rod of the solidified pole of this utility model. Detailed Implementation

[0022] like Figure 1 As shown in the figure, this embodiment provides an integrated deep-fusion solid-sealed pole structure suitable for 20kV and above, including a solid-sealed pole 5, an insulating tie rod assembly 6, an inlet terminal 1 disposed on the inlet end of the solid-sealed pole, and an outlet terminal 3 disposed on the outlet end of the solid-sealed pole. The inlet terminal 1 is connected to the solid-sealed pole 5 by an inlet terminal fastening screw 2, and the outlet terminal 3 is connected to the solid-sealed pole 5 by an outlet terminal fastening screw 4.

[0023] like Figures 1 to 5As shown, the solid-sealed electrode 5 includes an insulating shell, an arc-extinguishing chamber 5-5 disposed within the insulating shell, an incoming voltage sensor 5-10, an outgoing voltage sensor 5-22, and a current sensor (CT) 5-16. The insulating shell includes an epoxy resin layer 5-4 and a silicone layer 5-3 sleeved on the outside of the epoxy resin layer. An inner cavity is formed within the epoxy resin layer 5-4, located at one end of the moving contact of the arc-extinguishing chamber. The inner cavity is funnel-shaped from top to bottom, with its cross-sectional area gradually increasing, and the inner wall of the cavity is corrugated. The arc-extinguishing chamber 5-5, the incoming voltage sensor 5-10, the outgoing voltage sensor 5-22, and the current sensor 5-16 are integrally cast within the epoxy resin layer. Preferably, the silicone layer 5-3 has a skirt. This integrated encapsulation structure of the silicone layer 5-3 improves the electrical performance and reliability of the solid-sealed electrode.

[0024] The inlet rod 5-12 of the solid-sealed pole 5 is connected to the stationary contact of the arc-extinguishing chamber 5-5 via a double-ended set screw 5-14. The inlet rod 5-12 is fixedly connected to the fixing sleeve 5-1 via a set screw 5-13. One end of the inlet side voltage sensor 5-10 is connected to the fixing sleeve 5-1 via an inlet side sensor connecting wire 5-6. The inlet side sensor connecting wire 5-6 is fixed to the fixing sleeve 5-1 via an inlet side sensor connecting wire fixing nut 5-2. The other end of the inlet side voltage sensor 5-10 is connected to the inlet bolt via an inlet side sensor low-voltage side connecting wire 5-11. One end of the outgoing line voltage sensor 5-22 is fixedly connected to the stationary contact ring 5-7 via the outgoing line sensor connecting wire 5-21. The outgoing line sensor connecting wire 5-21 is fixedly connected to the stationary contact ring 5-7 via the outgoing line sensor connecting wire fixing nut 5-20. The other end of the outgoing line voltage sensor 5-22 is connected to the outgoing line bolt via the outgoing line sensor low-voltage side connecting wire 5-23. In this embodiment, both the incoming line voltage sensor 5-10 and the outgoing line voltage sensor 5-22 include three capacitors connected in series. Both the incoming line voltage sensor and the outgoing line voltage sensor use ceramic capacitors.

[0025] The bottom of the epoxy resin layer 5-4 is provided with an inlet voltage divider hole, an outlet voltage divider hole, and an annular sealing hole. An inlet bolt is installed in the inlet voltage divider hole, an outlet bolt is installed in the outlet voltage divider hole, and a sealing ring 12 is installed in the annular sealing hole. The bottom of the insulating housing is connected to the voltage sensor voltage divider plate 11. The sealing ring 12 is located between the voltage sensor voltage divider plate 11 and the epoxy resin layer 5-4 and is used for sealing between the voltage sensor voltage divider plate 11 and the insulating housing. The voltage sensor voltage divider plate 11 includes an inlet voltage divider plate and an outlet voltage divider plate. Both the inlet voltage divider plate and the outlet voltage divider plate are provided with voltage divider circuits. The inlet voltage divider plate includes a first contact corresponding to the inlet voltage divider plate mounting hole, and the outlet voltage divider plate includes a second contact corresponding to the outlet voltage divider plate mounting hole. The voltage divider circuit of the inlet voltage divider plate is electrically connected to the inlet bolt through the first contact, and the voltage divider circuit of the outlet voltage divider plate is electrically connected to the outlet bolt through the second contact. The voltage sensor voltage divider plate 11 has mounting nut posts 5-24 at the bottom for installing the sealing pole.

[0026] The inlet rod 5-12 of the solid-sealed pole 5 is connected to the stationary contact of the arc-extinguishing chamber 5-5. The moving contact of the arc-extinguishing chamber 5-5 is connected to the moving contact ring 7. The outer wall of the moving contact ring 7 is provided with a groove, and a spring contact finger 8 is provided in the groove. A stationary contact ring 5-7 is fixed in the epoxy resin layer 5-4. The stationary contact ring 5-7 is sleeved on the outside of the moving contact ring 7, and the spring contact finger 8 slides with the stationary contact ring 5-7. A guide ring 10 is provided on the moving contact ring 7. The stationary contact ring 5-7 is connected to the outlet terminal through the outlet rod 5-17. The stationary contact ring 5-7 is fixedly connected to the outlet rod 5-17 through the lower outlet copper rod locking screw 5-18. The moving contact ring 7 is fixedly connected to the insulating pull rod. The equalizing ring 5-9 is fixed to the epoxy resin layer 5-4 by the equalizing ring fixing screw 5-8. The bottom of the equalizing ring is rolled outward, and the upper end of the equalizing ring is close to the static contact ring. The equalizing ring is used to shield the high voltage irregular potential points and optimize the local electric field.

[0027] An insulating pull rod assembly 6 is installed inside the cavity of the solid-sealed pole 5. The insulating pull rod 6-1 of the insulating pull rod assembly 6 is connected to the moving contact ring 7, and an anti-loosening washer 9 is provided between the insulating pull rod and the moving contact ring. The stationary contact ring 5-7 is fixedly connected to the outlet rod 5-17 by a lower outlet copper rod locking screw 5-18. The outlet rod 5-17 extends perpendicularly to the insulating pull rod 6-1. The inlet end of the outlet rod 5-17 is connected to the stationary contact ring 5-7 by the lower outlet copper rod locking screw 5-18, and the outlet end of the outlet rod 5-17 extends out of the insulating housing. In this embodiment, the outlet rod 5-17 is made of copper rod.

[0028] The current sensor 5-16 adopts a ring structure, surrounding the lead rod 5-17, and is led out through the low-voltage side lead wire 5-19. A process hole is present in the epoxy resin layer 5-4 at the mounting location of the current sensor 5-16, and a fixing process plate 5-15 is installed inside the process hole. The fixing process plate 5-15 is used to fix the current sensor 5-16 and the silicone layer 5-3.

[0029] like Figure 6 As shown, the insulating pull rod assembly 6 includes an insulating pull rod 6-1, a contact spring guide rod, and a contact spring pressure rod 6-4. One end of the insulating pull rod 6-1 is connected to the moving contact finger ring 7, and the other end is connected to the contact spring guide rod. The other end of the contact spring guide rod is connected to the contact spring pressure rod 6-4, and the other end of the contact spring pressure rod 6-4 is connected to the overtravel connecting rod 6-7. Two contact spring guide sleeves 6-2 are provided on the outer sleeve of the contact spring guide rod, and a contact spring 6-3 is provided between the two contact spring guide sleeves 6-2. The contact spring 6-3 is sleeved on the outer sleeve of the contact spring guide rod. An insulating sleeve is provided on the outer sleeve of the contact spring 6-3 for electrical shielding. The insulating sleeve is fixed to the insulating pull rod 6-1. A contact spring limiting pin 6-5 is provided on the end of the contact spring pressure rod 6-4 near the contact spring guide rod for limiting the contact spring guide sleeve 6-2. The other end of the contact spring pressure rod 6-4 is connected to the overtravel connecting rod 6-7 through a locking nut 6-6.

Claims

1. An integrated, deeply fused, solid-sealed pole structure suitable for 20kV and above, comprising an insulating shell, an inlet terminal, an outlet terminal, and an arc-extinguishing chamber disposed within the insulating shell, characterized in that, The stationary contact of the arc-extinguishing chamber is connected to the incoming terminal via an incoming rod. The moving contact of the arc-extinguishing chamber is connected to a moving contact ring. A groove is provided on the outer wall of the moving contact ring, and a spring contact finger is provided in the groove. A stationary contact ring is fixed inside the insulating shell. The stationary contact ring is sleeved on the outside of the moving contact ring, and the spring contact finger slides in contact with the stationary contact ring. The stationary contact ring is connected to the outgoing terminal via an outgoing rod. The moving contact ring is fixedly connected to the insulating pull rod.

2. The integrated deep fusion deadfront pole structure suitable for 20 kV and above of claim 1, wherein, The inlet rod connects to the inlet-side voltage sensor. A guide ring is provided on the moving contact ring, which connects to the outlet-side voltage sensor. The inlet-side and outlet-side voltage sensors are embedded within an insulating housing using a single encapsulation process. The bottom of the insulating housing has an inlet voltage divider plate mounting hole, an outlet voltage divider plate mounting hole, and an annular sealing hole. An inlet bolt is installed in the inlet voltage divider plate mounting hole, an outlet bolt is installed in the outlet voltage divider plate mounting hole, and a sealing ring is installed in the annular sealing hole. A voltage sensor voltage divider plate is connected to the bottom of the insulating housing. The voltage sensor voltage divider plate includes an inlet voltage divider plate and an outlet voltage divider plate. Each output voltage divider plate is equipped with a voltage divider circuit. A sealing ring is located between the voltage sensor voltage divider plate and the insulating housing for sealing between the voltage sensor voltage divider plate and the insulating housing. The input bolt is connected to the low-voltage side of the input voltage sensor, and the output bolt is connected to the low-voltage side of the output voltage sensor. The input voltage divider plate includes a first contact corresponding to the mounting hole of the input voltage divider plate, and the output voltage divider plate includes a second contact corresponding to the mounting hole of the output voltage divider plate. The voltage divider circuit of the input voltage divider plate is electrically connected to the input bolt through the first contact, and the voltage divider circuit of the output voltage divider plate is electrically connected to the output bolt through the second contact.

3. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and above as described in claim 1, characterized in that, Below the static touch ring is an equalizing ring embedded in the insulating shell. The bottom of the equalizing ring has an outwardly rolled edge, and the upper end of the equalizing ring is in close contact with the static touch ring.

4. The integrated deep fusion deadfront pole structure suitable for 20 kV and above of claim 2, wherein, The incoming voltage sensor includes three capacitor banks connected in series, and the outgoing voltage sensor includes three capacitor banks connected in series.

5. The integrated deep fusion deadfront pole structure suitable for 20kV and above of claim 4, wherein, Both the incoming line voltage sensor and the outgoing line voltage sensor use ceramic capacitors.

6. The integrated deep fusion deadfront pole structure suitable for 20 kV and above of claim 5, wherein, It also includes a current sensor, which has a ring structure and surrounds the outlet rod. The current sensor is led out through a low-voltage side lead.

7. The integrated deep fusion deadfront pole structure suitable for 20 kV and above of claim 6, wherein, The insulating housing includes an epoxy resin layer and a silicone layer sleeved on the outside of the epoxy resin layer. The insulating housing at the current sensor mounting location has a process hole, and a fixing process plate is set in the process hole. The current sensor and the silicone layer are fixed together by the fixing process plate.

8. The integrated deep fusion deadfront pole structure suitable for 20kV and above of claim 7, wherein, The silicone layer has an umbrella-shaped skirt.

9. The integrated deep fusion deadfront pole structure suitable for 20kV and above of claim 1, wherein, The insulating shell has an inner cavity, and an insulating pull rod is installed inside the inner cavity. One end of the insulating pull rod is connected to the moving contact finger ring, and the other end is connected to the contact spring guide rod. The other end of the contact spring guide rod is connected to the contact spring pressure rod, and the other end of the contact spring pressure rod is connected to the overtravel connecting rod. The contact spring guide rod is fitted with a contact spring.

10. The integrated deep fusion deadfront pole structure suitable for 20 kV and above of claim 9, wherein, An insulating sleeve is fitted on the outside of the contact spring, and one end of the insulating sleeve is fixedly connected to the insulating pull rod.

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