Basin-type insulator and gas insulated switchgear

Abstract

The utility model relates to the technical field of parts of various devices for measuring electrical variables and magnetic variables, in particular to a basin-type insulator and gas insulated switchgear. The basin-type insulator comprises an insulator, the outer edge of the insulator is fixedly connected with a metal flange, a shielding ring is embedded in the insulator, the shielding ring is provided with terminals radiating outwards in the radial direction, and the terminals are divided into a grounding terminal fixedly connected with the metal flange and a detection terminal used for being connected with a high-frequency monitoring device. The metal flange is provided with a radial through hole corresponding to the detection terminal, an adapter conductor insulated relative to the metal flange is fixedly mounted in the radial through hole, one end of the adapter conductor is fixedly connected with the detection terminal, and the other end of the adapter conductor is used for being connected with a high-frequency monitoring device; the basin-type insulator provided by the utility model can prevent the shielding ring from being locally extruded and deformed, and improves the accuracy of partial discharge detection.

Description

Technical Field

[0001] This utility model relates to the technical field of components for various devices for measuring electrical and magnetic variables, and in particular to a basin-type insulator and a gas-insulated switchgear. Background Technology

[0002] Ultra-high frequency (UHF) detection is an advanced partial discharge detection technology, mainly used for condition monitoring and fault diagnosis of power equipment such as gas-insulated switchgear and transformers. Its basic principle is based on the UHF electromagnetic wave signals generated during partial discharge. By using UHF sensors to receive these electromagnetic wave signals, partial discharge can be detected, monitored, and located. For ultra-high voltage (UHV) gas-insulated switchgear, built-in UHF sensors have higher sensitivity than external UHF sensors. Therefore, a side port is often provided on the equipment body to install the UHF sensor inside the equipment, enabling partial discharge detection within the UHV gas-insulated switchgear. As a crucial component of gas-insulated switchgear, the UHF electromagnetic waves generated by partial discharge within the switchgear pass through the basin insulator, which reflects and attenuates the electromagnetic wave signals. To ensure that the UHF sensors within the gas-insulated switchgear can accurately capture the UHF electromagnetic waves generated by partial discharge, a UHF signal extraction device is often connected to the basin insulator to monitor the partial discharge phenomenon.

[0003] Chinese invention patent CN103399179B, with an authorization announcement date of August 26, 2015, discloses an ultra-high frequency signal extraction device for a basin-type insulator's equalizing shield ring. This extraction device includes a conductive lead-out rod, an insulating fixing sleeve, and a metal conductive strip. The conductive lead-out rod is threaded into the insulating fixing sleeve, which is used to install within the bolt mounting hole of the basin-type insulator. The inner end of the conductive lead-out rod extends out of the insulating fixing sleeve and is inserted into the bolt mounting hole, conductively connecting to the equalizing shield ring built into the basin-type insulator. Its outer end extends out from the insulating fixing sleeve and is connected to a plug of an external monitoring device, inserting into the inner conductor of the plug. The insulating fixing sleeve includes a fixed section and a connecting section. The fixed section is threadedly connected to the bolt mounting hole of the basin-type insulator and the conductive lead-out rod, while the connecting section is threadedly connected to the outer conductor of the plug of the external monitoring device. The metal conductive strip is fixedly sleeved outside the insulating fixing sleeve to ensure conductive connection with the plug.

[0004] The above solution involves inserting both the conductive lead-out rod and the insulating fixing sleeve into the bolt mounting holes of the basin-type insulator. When partial discharge measurement is required, the bolts in the bolt mounting holes must first be removed, and then the conductive lead-out rod and the insulating fixing sleeve must be inserted into the bolt mounting holes. At the same time, an external monitoring device is connected via a plug. The assembly process of the basin-type insulator and the signal lead-out device is cumbersome and complicated. During the process of screwing the conductive lead-out rod into the bolt mounting holes, it is easy to apply a pushing force to the equalizing shield ring, causing local deformation of the equalizing shield ring, resulting in poor accuracy of partial discharge detection. Utility Model Content

[0005] The purpose of this invention is to provide a basin-type insulator to solve the problem of localized deformation of the equalizing shield ring. Another purpose of this invention is to provide a gas-insulated switchgear that, by installing the aforementioned basin-type insulator, solves the problem of poor accuracy in partial discharge detection.

[0006] To achieve the above objectives, the basin-type insulator of this utility model adopts the following technical solution:

[0007] A basin-type insulator includes an insulator body, a metal flange fixedly connected to the outer edge of the insulator body, a shielding ring embedded in the insulator body, and terminals radiating radially outward on the shielding ring. The terminals are divided into a grounding terminal fixedly connected to the metal flange and a detection terminal for connection to a high-frequency monitoring device. The metal flange has radial through holes corresponding to the detection terminals, and a transfer conductor insulated relative to the metal flange is fixedly installed in the radial through holes. One end of the transfer conductor is fixedly connected to the detection terminal, and the other end is used to connect to the high-frequency monitoring device.

[0008] Furthermore, an insulating sleeve is fixed to the outside of the adapter conductor, and the insulating sleeve is used to insulate against the metal flange.

[0009] Furthermore, a protective cover is fixedly installed on the metal flange at the end of the insulating sleeve away from the detection terminal. The protective cover includes a bottom wall, a surrounding wall, and a sealing cover. The bottom wall is fixedly connected to the metal flange, and the insulating sleeve is pressed and fixed by the bottom wall of the protective cover.

[0010] Furthermore, the end of the insulating sleeve furthest from the detection terminal is provided with a tapered tip, and the bottom wall is provided with a tapered hole corresponding to the tapered tip.

[0011] Furthermore, the detection terminal is threadedly connected to the adapter conductor.

[0012] Furthermore, the detection terminal is provided with a threaded hole, and the adapter conductor is threadedly engaged with the detection terminal through a screw at its end. A shoulder is provided at the root of the screw to abut against the detection terminal.

[0013] Furthermore, the end of the adapter conductor away from the detection terminal is provided with a connection hole for electrical connection with the connector of the high-frequency monitoring device, and a signal lead-out connector that is plugged into the adapter conductor is fixedly provided in the protective cover.

[0014] Furthermore, the signal lead-out connector is a tee connector, and an overvoltage protection component is connected to one of the ports of the tee connector.

[0015] Furthermore, the tee connector is an N-type connector.

[0016] Beneficial Effects: This utility model's basin-type insulator is an improved invention. By setting a grounding terminal and a detection terminal on the shielding ring, the grounding terminal ensures equipment safety, while the detection terminal can connect to a high-frequency monitoring device to monitor ultra-high frequency electromagnetic wave signals generated by partial discharge. Placing the transition conductor within the radial perforation of the metal flange improves the stability of the transition conductor. Simultaneously, the insulation of the transition conductor relative to the metal flange ensures accurate transmission of ultra-high frequency electromagnetic wave signals. Furthermore, by placing the transition conductor between the detection terminal and the high-frequency monitoring device, the metal flange enhances the connection reliability between the transition conductor and both the detection terminal and the high-frequency monitoring device. The arrangement of the transition conductor and detection terminal also prevents the high-frequency monitoring device from directly entering the basin-type insulator and directly contacting the shielding ring, thus avoiding localized compression deformation of the shielding ring.

[0017] The gas-insulated switchgear of this utility model adopts the following technical solution:

[0018] Gas-insulated switchgear includes a basin-type insulator, which comprises an insulator body. A metal flange is fixedly connected to the outer edge of the insulator body. A shielding ring is embedded in the insulator body. The shielding ring is provided with radially outwardly radiating terminals. The terminals are divided into grounding terminals fixedly connected to the metal flange and detection terminals for connection to a high-frequency monitoring device. The metal flange is provided with radial through holes corresponding to the detection terminals. A transition conductor insulated relative to the metal flange is fixedly installed in the radial through holes. One end of the transition conductor is fixedly connected to the detection terminal, and the other end is used to connect to the high-frequency monitoring device.

[0019] Furthermore, an insulating sleeve is fixed to the outside of the adapter conductor, and the insulating sleeve is used to insulate against the metal flange.

[0020] Furthermore, a protective cover is fixedly installed on the metal flange at the end of the insulating sleeve away from the detection terminal. The protective cover includes a bottom wall, a surrounding wall, and a sealing cover. The bottom wall is fixedly connected to the metal flange, and the insulating sleeve is pressed and fixed by the bottom wall of the protective cover.

[0021] Furthermore, the end of the insulating sleeve furthest from the detection terminal is provided with a tapered tip, and the bottom wall is provided with a tapered hole corresponding to the tapered tip.

[0022] Furthermore, the detection terminal is threadedly connected to the adapter conductor.

[0023] Furthermore, the detection terminal is provided with a threaded hole, and the adapter conductor is threadedly engaged with the detection terminal through a screw at its end. A shoulder is provided at the root of the screw to abut against the detection terminal.

[0024] Furthermore, the end of the adapter conductor away from the detection terminal is provided with a connection hole for electrical connection with the connector of the high-frequency monitoring device, and a signal lead-out connector that is plugged into the adapter conductor is fixedly provided in the protective cover.

[0025] Furthermore, the signal lead-out connector is a tee connector, and an overvoltage protection component is connected to one of the ports of the tee connector.

[0026] Furthermore, the tee connector is an N-type connector.

[0027] Beneficial Effects: This utility model of gas-insulated switchgear is an improved invention. By setting a grounding terminal and a detection terminal on the shielding ring, the grounding terminal ensures the safety of the equipment, while the detection terminal can connect to a high-frequency monitoring device to monitor the ultra-high frequency electromagnetic wave signals generated by partial discharge. Placing the transfer conductor within the radial perforation of the metal flange improves the stability of the transfer conductor. Simultaneously, the insulation of the transfer conductor relative to the metal flange ensures accurate transmission of the ultra-high frequency electromagnetic wave signals. Furthermore, by placing the transfer conductor between the detection terminal and the high-frequency monitoring device, the metal flange enhances the connection reliability between the transfer conductor, the detection terminal, and the high-frequency monitoring device. The placement of the transfer conductor and detection terminal also prevents the high-frequency monitoring device from directly entering the basin-type insulator and directly contacting the shielding ring, avoiding localized compression deformation of the shielding ring and improving the accuracy of partial discharge detection. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the basin-type insulator of this utility model;

[0029] Figure 2 This is a top view schematic diagram of the connection structure between the shielding ring and the lead-out terminal in one embodiment of the basin-type insulator of this utility model.

[0030] Figure 3 This is a schematic diagram showing the positional relationship between the lead-out terminals and the basin insulator in one embodiment of the basin insulator of this utility model.

[0031] Figure 4 This is a schematic diagram showing the connection structure between one embodiment of the signal lead-out device and one embodiment of the basin-type insulator of this utility model.

[0032] In the diagram: 1. Insulator; 2. Metal flange; 3. Shielding ring; 4. Grounding terminal; 5. UHF monitoring device; 6. Detection terminal; 7. Adapter conductor; 8. Insulating sleeve; 9. Bottom wall; 10. Enclosure; 11. Sealing cover; 12. Conical tip; 13. Conical hole; 14. Conical head; 15. Screw; 16. Signal lead-out connector; 17. Overvoltage protection component; 18. Connection hole. Detailed Implementation

[0033] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0034] Because gas-insulated switchgear has a compact internal structure, it is prone to partial discharge. Partial discharge generates ultra-high frequency (UHF) electromagnetic wave signals. These signals pass through the basin-type insulators within the switchgear, where they are reflected and attenuated. To accurately detect UHF signals during partial discharge detection, a shielding ring is typically embedded within the basin-type insulator. A signal lead-out device connects the partial discharge monitoring equipment to this ring, which then transmits the UHF signal. However, the lead-out rod of the signal lead-out device extends into the basin-type insulator, potentially deforming the shielding ring. To prevent this deformation, radially extending terminals are installed on the shielding ring, with a transfer conductor connected to each terminal. This allows the terminal to connect to the UHF monitoring device via the transfer conductor, avoiding direct contact with the shielding ring and enabling partial discharge detection without entering the basin-type insulator. Based on the above inventive concept, this utility model proposes a basin-type insulator and a gas-insulated switchgear. By setting radially extending terminals on the shielding ring built into the basin-type insulator, and connecting the terminals to an ultra-high frequency monitoring device through a transfer conductor, the transmission of ultra-high frequency electromagnetic wave signals and the accurate monitoring of partial discharge can be realized.

[0035] The embodiments of the basin-type insulator of this utility model are as follows:

[0036] See Figures 1 to 4As a basic embodiment of this utility model, the basin-type insulator includes an insulator 1, with a metal flange 2 fixedly connected to the outer edge of the insulator 1. A shielding ring 3 is embedded in the insulator 1, and terminals radiating radially outward are provided on the shielding ring 3. The terminals are divided into a grounding terminal 4 fixedly connected to the metal flange 2 and a detection terminal 6 for connecting to an ultra-high frequency monitoring device 5. The grounding terminal 4 can ensure the safety of equipment and personnel. When a partial discharge occurs inside the gas-insulated switchgear, the detection terminal 6 can transmit the ultra-high frequency electromagnetic wave signal generated by the partial discharge through connection with the ultra-high frequency monitoring device 5. The metal flange 2 is provided with radial through holes corresponding to the detection terminal 6, and a device is fixedly installed in the radial through holes relative to the metal flange 2. The insulated transfer conductor 7 is placed within the radial perforation of the metal flange 2. The radial perforation provides support and restraint for the transfer conductor 7, improving its stability. Furthermore, the relative insulation between the transfer conductor 7 and the metal flange 2 enhances the accurate transmission of UHF electromagnetic wave signals. One end of the transfer conductor 7 is fixedly connected to the detection terminal 6, while the other end is used to connect to the UHF monitoring device 5. In other words, the transfer conductor 7 acts as an intermediary connecting the detection terminal 6 and the UHF monitoring device 5, preventing the UHF monitoring device 5 from directly entering the basin-type insulator and directly contacting the shielding ring 3. This avoids the shielding ring 3 from being squeezed and deformed, thus improving the accuracy of partial discharge monitoring.

[0037] In a preferred embodiment of this utility model, an insulating sleeve 8 is fixed to the outside of the adapter conductor 7, and the insulating sleeve 8 is insulated from the metal flange 2. The insulating sleeve 8 completely covers the adapter conductor 7 along the outer circumference of the adapter conductor 7, providing effective and comprehensive insulation protection for the adapter conductor 7, avoiding the possibility of the adapter conductor 7 conducting with the metal flange 2, ensuring the safety of the equipment, and extending the service life of the equipment. In addition, the insulating sleeve 8 can also provide support and guidance for the adapter conductor 7, ensuring that the relative position between the insulating sleeve 8 and the adapter conductor 7 is fixed.

[0038] In a preferred embodiment of this utility model, a protective cover is fixedly installed on the metal flange 2 at the end of the insulating sleeve 8 away from the detection terminal 6. The protective cover includes a bottom wall 9, a surrounding wall 10, and a sealing cover 11. The bottom wall 9 is fixedly connected to the metal flange 2, and the insulating sleeve 8 is pressed and fixed by the bottom wall 9 of the protective cover. The protective cover can provide support and positioning for the insulating sleeve 8, preventing the insulating sleeve 8 from shifting, affecting the insulation performance and the monitoring of partial discharge.

[0039] In a preferred embodiment of this utility model, the end of the insulating sleeve 8 furthest from the detection terminal 6 is provided with a tapered tip 12, and the bottom wall 9 is provided with a tapered hole 13 corresponding to the tapered tip 12. The tapered tip 12 can fit into the tapered hole 13 and be pressed and fixed by the bottom wall 9. The shape of the transition conductor 7 is similar to that of the insulating sleeve 8, and its end furthest from the detection terminal 6 is also provided with a tapered tip 14. The fit between the tapered hole 13 and the tapered tip 12 can improve the connection reliability between the insulating sleeve 8 and the bottom wall 9, and the connection reliability between the insulating sleeve 8 and the transition conductor 7 is also improved, thereby improving the connection reliability between the transition conductor 7 and the UHF monitoring device 5.

[0040] In a preferred embodiment of this invention, the detection terminal 6 and the adapter conductor 7 are threadedly connected, meaning they are detachably connected. For assembly, the adapter conductor 7 is screwed on; for disassembly, it is twisted in the opposite direction to separate it from the detection terminal 6. In other embodiments, the detection terminal 6 and the adapter conductor 7 can also be connected by a plug-in connection. A socket is provided on the detection terminal 6, and a pin adapted to the socket is provided at the end of the adapter conductor 7. The detachable connection between the adapter conductor 7 and the detection terminal 6 is achieved through the plug-in engagement of the pin and the socket.

[0041] In a preferred embodiment of this utility model, the detection terminal 6 is provided with a threaded hole, and the adapter conductor 7 is threadedly engaged with the detection terminal 6 through a screw 15 at its end. A shoulder is provided at the root of the screw 15 to abut against the detection terminal 6. When assembly is required, the threaded hole on the adapter conductor 7 and the detection terminal 6 are aligned, and the screw 15 at the end of the adapter conductor 7 is screwed until the root of the screw 15 abuts against the shoulder of the detection terminal 6. At this time, the screw 15 and the threaded hole are in place, that is, the adapter conductor 7 and the detection terminal 6 are connected in place.

[0042] In a preferred embodiment of this utility model, the end of the adapter conductor 7 furthest from the detection terminal 6 is provided with a connection hole 18 for electrical connection with the connector of the UHF monitoring device 5. A signal lead-out connector 16 is fixedly provided in the protective cover and inserted into the adapter conductor 7. One end of the signal lead-out connector 16 is inserted into the connection hole 18 of the adapter conductor 7, and the electrical connection between the adapter conductor 7 and the UHF monitoring device 5 is realized through the signal lead-out connector 16.

[0043] In a preferred embodiment of this utility model, the signal lead-out connector 16 is a three-way connector, and an overvoltage protection component 17 is connected to one of the ports of the three-way connector. During the process of the UHF monitoring device 5 monitoring and capturing the UHF electromagnetic wave signal generated by partial discharge and optimizing the gas-insulated switchgear, the overvoltage protection component 17 can provide electrical protection for the entire device and ensure the smooth progress of partial discharge monitoring.

[0044] As a preferred embodiment of this utility model, the tee connector is an N-type connector, which is a general threaded connector. That is, the electrical equipment connected to the tee connector is detachable, which is convenient for assembly and disassembly, as well as replacement and maintenance.

[0045] The process of using the basin-type insulator of this utility model is as follows: First, the grounding terminal 4 of the basin-type insulator is fixedly connected to the metal flange 2. The detection terminal 6 is threadedly connected to one end of the adapter conductor 7. The signal lead-out connector 16 is plugged into and electrically connected to the other end of the adapter conductor 7, so that the adapter conductor 7 can transmit the ultra-high frequency electromagnetic wave signal received on the basin-type insulator. The ultra-high frequency monitoring device 5 connected to the signal lead-out connector 16 can monitor and capture the ultra-high frequency electromagnetic wave signal generated by partial discharge. When partial discharge occurs inside the gas-insulated switchgear, the partial discharge detection device connected to the signal lead-out connector 16 detects, captures and analyzes the generated ultra-high frequency electromagnetic wave signal. The overvoltage protection component 17 connected to the signal lead-out connector 16 provides electrical protection for the partial discharge detection process, ensuring the accuracy of partial discharge detection.

[0046] Implementation methods of the gas-insulated switchgear of this utility model:

[0047] The gas-insulated switchgear monitors partial discharge by installing the aforementioned basin-type insulator inside the equipment. The specific structure of the basin-type insulator will not be detailed here. By connecting the detection terminal 6 inside the basin-type insulator to the UHF monitoring device 5 through the adapter conductor 7, accurate detection of partial discharge occurs inside the gas-insulated switchgear. This avoids deformation caused by compression of the shielding ring 3, and enables the capture and analysis of UHF electromagnetic wave signals generated by partial discharge. This facilitates subsequent optimization of the gas-insulated switchgear, ensures stable transmission of UHF electromagnetic wave signals, and allows the signal lead-out connector 16 to receive UHF electromagnetic wave signals generated by partial discharge, thereby improving the accuracy of partial discharge detection.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A basin-type insulator, comprising an insulator body, wherein a metal flange is fixedly connected to the outer edge of the insulator body, and a shielding ring is embedded in the insulator body, characterized in that: The shielding ring is provided with terminals that radiate outwards radially. The terminals are divided into grounding terminals that are fixedly connected to the metal flange and detection terminals that are connected to the high-frequency monitoring device. The metal flange is provided with radial through holes corresponding to the detection terminals. A transfer conductor that is insulated relative to the metal flange is fixedly installed in the radial through holes. One end of the transfer conductor is fixedly connected to the detection terminal, and the other end is used to connect to the high-frequency monitoring device.

2. The basin-type insulator according to claim 1, characterized in that: An insulating sleeve is fixed to the outside of the adapter conductor, and the adapter conductor is insulated from the metal flange through the insulating sleeve.

3. The basin-type insulator according to claim 2, characterized in that: A protective cover is fixedly installed on the metal flange at the end of the insulating sleeve away from the detection terminal. The protective cover includes a bottom wall, a surrounding wall, and a sealing cover. The bottom wall is fixedly connected to the metal flange, and the insulating sleeve is pressed and fixed by the bottom wall of the protective cover.

4. The basin-type insulator according to claim 3, characterized in that: The end of the insulating sleeve furthest from the detection terminal is provided with a tapered tip, and the bottom wall is provided with a tapered hole corresponding to the tapered tip.

5. The basin-type insulator according to claim 1, characterized in that: The detection terminal is threadedly connected to the adapter conductor.

6. The basin-type insulator according to claim 5, characterized in that: The detection terminal is provided with a threaded hole, and the adapter conductor is threadedly engaged with the detection terminal through a screw at its end. A shoulder is provided at the root of the screw to abut against the detection terminal.

7. The basin-type insulator according to claim 3, characterized in that: The end of the adapter conductor away from the detection terminal is provided with a connection hole for electrical connection with the connector of the high-frequency monitoring device, and a signal lead-out connector that is plugged into the adapter conductor is fixedly provided in the protective cover.

8. The basin-type insulator according to claim 7, characterized in that: The signal lead-out connector is a T-connector, and an overvoltage protection component is connected to one of the ports of the T-connector.

9. The basin-type insulator according to claim 8, characterized in that: The tee connector is an N-type connector.

10. A gas-insulated switchgear, characterized in that: Includes the basin insulator as described in any one of claims 1-9.

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