An integrated deep fusion sealed pole structure suitable for 20kV and below

Abstract

This utility model discloses an integrated, deeply fused, solid-sealed pole structure suitable for 20kV and below, including an insulating shell, an inlet end, an outlet end, and an arc-extinguishing chamber disposed within the insulating shell. The inlet end connects to an inlet-side voltage sensor, and the outlet end connects to an outlet-side voltage sensor. Both the inlet and outlet-side voltage sensors are embedded within the insulating shell. The bottom of the insulating shell has an inlet voltage divider hole, an outlet voltage divider hole, and an annular sealing hole. An inlet voltage divider capacitor and an outlet voltage divider capacitor are disposed within the inlet voltage divider hole, and a sealing ring is disposed within the annular sealing hole. A voltage sensor voltage divider plate is connected to the bottom of the insulating shell, and the sealing ring is located between the voltage sensor voltage divider plate and the insulating shell. The voltage sensor voltage divider plate includes a first protrusion and a second protrusion corresponding to the inlet and outlet voltage divider holes. By adopting an integrated encapsulation structure and using a high-temperature resistant series ceramic capacitor as the voltage acquisition device, it functionally meets the requirements of traditional primary and secondary fused solid-sealed poles.

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 below. Background Technology

[0002] Outdoor primary and secondary integrated solid-sealed pole-type capacitors are highly integrated devices comprising a primary conductor, arc-extinguishing device, insulator, and data acquisition sensor. They are functional components integrating conductivity, arc extinguishing, and signal acquisition. Conventional primary and secondary integrated solid-sealed pole-type capacitors below 20kV often use post-mounted capacitor bars as the voltage acquisition carrier. Through post-mounting and other assembly structures, some designs also use post-mounted structures for components such as the arc-extinguishing chamber to cooperate with the main body. The capacitors are primarily organic thin-film dielectric capacitors. After the above devices are assembled through mechanical structures, the overall system exhibits significant problems in terms of electric field distribution, partial discharge, small air gap discharge, and tolerance to extreme outdoor temperature conditions.

[0003] Traditional primary and secondary fusion solid-sealed poles have the following main drawbacks:

[0004] 1. The electric field distribution between the breaks has a significant impact: In traditional pre-reserved cavity fusion poles, considering the universality of the acquisition sensor, the pre-reserved cavity generally adopts a uniform size, which causes the pre-reserved high-voltage ends of the incoming and outgoing lines to be on the same horizontal plane. This arrangement of high-voltage ends has a significant adverse effect on the insulation effect between the breaks.

[0005] 2. Obvious local small air gap discharge phenomenon: Traditional poles use pre-assembled structure voltage sensors. There is an assembly gap between the sensor body and the pre-assembled cavity of the solid-sealed pole. This gap has different discharge characteristics under different temperature and humidity conditions, which has a certain impact on the overall electrical performance of the pole.

[0006] 3. 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

[0007] 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.

[0008] Technical Solution: To solve the above problems, this utility model adopts an integrated, deeply fused, solid-sealed pole structure suitable for 20kV and below, including an insulating shell, an inlet end, an outlet end, and an arc-extinguishing chamber disposed within the insulating shell. The inlet end is connected to an inlet-side voltage sensor, and the outlet end is connected to an outlet-side voltage sensor. The inlet-side and outlet-side voltage sensors are embedded within the insulating shell. The bottom of the insulating shell is provided with an inlet voltage divider hole, an outlet voltage divider hole, and an annular sealing hole. An inlet bolt is disposed within the inlet voltage divider hole, and an outlet voltage divider hole is disposed within the outlet voltage divider hole. The outlet bolt has a sealing ring installed inside the annular sealing hole. The bottom of the insulating housing is connected to the voltage sensor voltage divider plate, which has a voltage divider circuit. The sealing ring is located between the voltage sensor voltage divider plate and the insulating housing for sealing between them. The inlet bolt is connected to the inlet-side voltage sensor, and the outlet bolt is connected to the outlet-side voltage sensor. The voltage sensor voltage divider plate includes a first contact and a second contact corresponding to the inlet and outlet voltage divider holes, respectively. The first and second contacts are electrically connected to the inlet bolt and the outlet bolt, respectively.

[0009] Furthermore, the input-side voltage sensor includes two capacitors connected in series, and the output-side voltage sensor includes two capacitors connected in series.

[0010] Furthermore, both the input-side voltage sensor and the output-side voltage sensor employ ceramic capacitors.

[0011] Furthermore, it also includes an outgoing conductive rod, the inlet end of which is connected to the moving contact of the arc-extinguishing chamber via a flexible connection, and the outlet end of which extends out of the insulating housing.

[0012] Furthermore, it also includes a current sensor, which has a ring structure and surrounds the outgoing conductive 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.

[0014] Furthermore, the insulating housing at the current sensor mounting location has process holes, 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.

[0015] Furthermore, an inner cavity is provided within the insulating housing, and an insulating pull rod is installed within the inner cavity. The insulating pull rod is connected to the moving contact of the arc-extinguishing chamber. One end of the insulating pull rod is connected to the moving contact of the arc-extinguishing chamber, and the other end is connected to a contact spring guide rod. The other end of the contact spring guide rod is connected to a contact spring compression rod, and the other end of the contact spring compression rod is connected to an overtravel connecting rod. A contact spring is sleeved on the contact spring guide rod.

[0016] Beneficial effects: Compared with the prior art, the advantages of this utility model are that by adopting an integrated encapsulation structure and using high-temperature resistant series ceramic capacitors as voltage acquisition devices, it meets the functional requirements of traditional primary and secondary integrated solid-encapsulated terminals. At the same time, it has made a completely new design in terms of primary acquisition capacitor gradient arrangement, primary encapsulation structure, and capacitor material selection, which has greatly improved electrical performance and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the solid-sealed pole of this utility model.

[0018] Figure 2 This is a cross-sectional view of the solid-sealed pole of this utility model.

[0019] Figure 3 This is a first cross-sectional view of the solid-sealed pole removing the insulating pull rod of this utility model.

[0020] Figure 4 This is a second sectional view of the solid-sealed pole removing the insulating pull rod of this utility model.

[0021] Figure 5 This is a bottom view of the solid-sealed pole of this utility model.

[0022] Figure 6 This is a cross-sectional view of the insulating tie rod of the solidified pole of this utility model. Detailed Implementation

[0023] like Figure 1 As shown in the figure, this embodiment provides an integrated deep-fusion solid-sealed pole structure suitable for 20kV and below, 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.

[0024] like Figures 1 to 5 As 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 5-7, an outgoing voltage sensor 5-15, and a current sensor (CT) 5-11. 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 provided within the epoxy resin layer 5-4, located at one end of the moving contact of the arc-extinguishing chamber. The arc-extinguishing chamber 5-5, the incoming voltage sensor 5-7, the outgoing voltage sensor 5-15, and the current sensor 5-11 are integrally cast within the epoxy resin layer. Preferably, the silicone layer 5-3 is provided with a skirt. The integrated encapsulation structure of the silicone layer 5-3 improves the electrical performance and reliability of the solid-sealed electrode.

[0025] The inlet end of the sealed terminal 5 is fixedly connected to the fixing sleeve 5-1 by a set screw 5-9. One end of the inlet-side voltage sensor 5-7 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 5-7 is connected to the inlet bolt via an inlet-side sensor low-voltage side connecting wire 5-8. One end of the outlet-side voltage sensor 5-15 is fixedly connected to the outlet conductive rod 5-12 via an outlet-side sensor connecting wire 5-14. The other end of the outlet-side voltage sensor 5-15 is connected to the outlet bolt via an outlet-side sensor low-voltage side connecting wire 5-16. In this embodiment, both the inlet-side voltage sensor 5-7 and the outlet-side voltage sensor 5-15 include two capacitors connected in series. Both the inlet-side and outlet-side voltage sensors are ceramic capacitors.

[0026] The epoxy resin layer 5-4 has an inlet voltage divider hole, an outlet voltage divider hole, and an annular sealing hole at its bottom. 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 11 is installed in the annular sealing hole. A voltage sensor voltage divider plate 10 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, both of which have voltage divider circuits. The sealing ring 11 is located between the voltage sensor voltage divider plate 10 and the epoxy resin layer 5-4, used for sealing between the voltage sensor voltage divider plate 10 and the insulating housing. The inlet voltage divider plate includes a first contact corresponding to the inlet voltage divider hole, and the outlet voltage divider plate includes a second contact corresponding to the outlet voltage divider 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. A mounting nut post 5-17 is provided at the bottom of the voltage sensor voltage divider plate 10 for installing the sealing electrode post.

[0027] The inlet end of the solid-sealed pole 5 is connected to the stationary contact of the arc-extinguishing chamber 5-5. An insulating pull rod assembly 6 is installed inside the cavity, and the insulating pull rod 6-1 of the insulating pull rod assembly 6 is connected to the moving contact of the arc-extinguishing chamber. The moving contact of the arc-extinguishing chamber is connected to the outgoing conductive rod 5-12 through a flexible connection 8. The outgoing conductive rod 5-12 extends perpendicularly to the insulating pull rod 6-1. The inlet end of the outgoing conductive rod 5-12 is connected to the moving contact of the arc-extinguishing chamber through the flexible connection 8, and the outgoing end of the outgoing conductive rod 5-12 extends out of the insulating shell. In this embodiment, the outgoing conductive rod 5-12 is made of copper rod. The flexible connection 8 is fixed to the outgoing conductive rod 5-12 by a flexible connection fastening screw 7, and an anti-loosening washer 9 is provided between the flexible connection 8 and the moving contact.

[0028] The current sensor 5-11 adopts a ring structure, surrounding the outgoing conductive rod 5-12, and is led out through the low-voltage side lead wire 5-13. A process hole is present in the epoxy resin layer 5-4 at the mounting location of the current sensor 5-11, and a fixing process plate 5-10 is installed inside the process hole. The fixing process plate 5-10 is used to fix the current sensor 5-11 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 compression rod 6-4. One end of the insulating pull rod 6-1 is connected to the moving contact of the arc-extinguishing chamber, 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 compression rod, and the other end of the contact spring compression rod is connected to the overtravel connecting rod. Two contact spring guide sleeves 6-2 are provided on the outer sleeve of the contact spring guide rod, and a contact spring 6-4 is provided between the two contact spring guide sleeves 6-2. The contact spring 6-4 is sleeved outside the contact spring guide rod. A contact spring limiting pin 6-5 is provided on one end of the contact spring compression 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 compression 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 below, comprising an insulating shell, an inlet terminal, an outlet terminal, and an arc-extinguishing chamber disposed within the insulating shell, characterized in that, The input terminal is connected to an input-side voltage sensor, and the output terminal is connected to an output-side voltage sensor. Both the input-side and output-side voltage sensors are embedded within an insulating housing. The bottom of the insulating housing is provided with an input voltage divider hole, an output voltage divider hole, and an annular sealing hole. An input bolt is installed in the input voltage divider hole, an output bolt is installed in the output voltage divider 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 input voltage divider plate and an output voltage divider plate, both of which are configured with voltage dividers. The circuit has a sealing ring located between the voltage sensor voltage divider plate and the insulating housing for sealing between them. The inlet bolt is connected to the inlet-side voltage sensor, and the outlet bolt is connected to the outlet-side voltage sensor. The inlet voltage divider plate includes a first contact corresponding to the inlet voltage divider hole, and the outlet voltage divider plate includes a second contact corresponding to the outlet voltage divider 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.

2. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 1, characterized in that, The input-side voltage sensor includes two capacitors connected in series, and the output-side voltage sensor includes two capacitors connected in series.

3. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 2, characterized in that, Both the incoming line voltage sensor and the outgoing line voltage sensor use ceramic capacitors.

4. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 1, characterized in that, It also includes an outgoing conductive rod, the inlet end of which is connected to the moving contact of the arc-extinguishing chamber via a flexible connection, and the outlet end of which extends out of the insulating housing.

5. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 4, characterized in that, It also includes a current sensor, which has a ring structure and surrounds the outgoing conductive rod. The current sensor is led out through a low-voltage side lead.

6. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 5, characterized in that, The insulating shell includes an epoxy resin layer and a silicone layer sleeved on the outside of the epoxy resin layer.

7. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 6, characterized in that, The insulating housing at the current sensor mounting location has a process hole, and a fixing process plate is installed in the process hole. The current sensor and the silicone layer are fixed together by the fixing process plate.

8. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 6, characterized in that, The silicone layer has an umbrella-shaped skirt.

9. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 1, characterized in that, The insulating housing has an inner cavity, and an insulating rod is installed inside the inner cavity. The insulating rod is connected to the moving contact of the arc-extinguishing chamber.

10. The integrated deep-fusion solid-sealed pole structure suitable for 20kV and below as described in claim 9, characterized in that, One end of the insulating pull rod is connected to the moving contact of the arc-extinguishing chamber, 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.

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