Shielding type plug-in lightning arrester with electricity testing function

Abstract

The invention belongs to the field of lightning arresters, and particularly relates to a shielding type plug-in lightning arrester with an electricity testing function. The lightning arrester is provided with an electricity testing terminal; the electricity testing terminal is installed on the peripheral side of the upper flange, the tail end of the electricity testing terminal sequentially penetrates through the upper flange and the outer insulating layer to be electrically connected with the inner shielding layer, and the electricity testing terminal is electrically insulated from the upper flange and the outer insulating layer. According to the invention, the electricity testing terminal is electrically connected with the internal shielding layer and is insulated from the external shielding layer. When the lightning arrester operates normally, the live-line indicator can be connected to the live-line testing terminal so as to display whether the lightning arrester is live-line or not. In addition, a partial discharge tester can be connected to the electricity verification test terminal, the partial discharge capacity of the lightning arrester can be detected without dismounting the lightning arrester, the workload is small, and the test cost is low.

Description

Technical Field

[0001] This invention relates to a surge arrester, specifically a shielded pluggable surge arrester with voltage detection function. Background Technology

[0002] With the increasing use of C-GIS gas-insulated switchgear and ring main units in the power industry, the demand for shielded pluggable surge arresters is also growing.

[0003] Power frequency partial discharge testing is one of the important testing methods for evaluating the operational reliability of surge arresters. However, currently, shielded pluggable surge arresters in the industry typically do not have partial discharge test interfaces. When conducting power frequency partial discharge tests on surge arresters, it is necessary to remove the surge arrester from the system and then test it using specialized testing fixtures, which is labor-intensive and costly. Furthermore, both removal and installation require a high-voltage power outage, significantly impacting the normal operation of the system. On the other hand, surge arresters lack a liveness indicator function; whether the surge arrester is energized during system operation cannot be directly displayed. Often, it can only be indirectly determined by connecting a liveness indicator device to a voltage detection hole in the matching inner cone sleeve. If the surge arrester is not installed correctly or its dimensions are mismatched, resulting in a reliably disconnected electrical connection between the surge arrester contact electrode and the conductive rod of the inner cone socket, although the inner cone sleeve may be energized, the surge arrester itself may not be. In such cases, judging the surge arrester's liveness based on the inner cone can easily mislead maintenance personnel. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of existing shielded plug-in surge arresters, which require removing the surge arrester from the system and then testing it with special testing fixtures for power frequency partial discharge tests. This is labor-intensive and costly, and both removal and installation require high-voltage power outages, affecting normal system operation. Furthermore, the surge arresters lack a liveness indicator function, and relying on the inner cone to determine whether the surge arrester is live can easily mislead maintenance personnel. Therefore, this invention provides a shielded plug-in surge arrester with a liveness detection function.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A shielded pluggable surge arrester with voltage detection function, comprising a surge arrester body;

[0007] The surge arrester body includes a main insulation layer, contact electrodes, a lower electrode, an outer insulation layer, an inner shielding layer, an upper flange, and a connecting housing;

[0008] The contact electrode and the lower electrode are respectively installed at both ends of the main insulation layer. The inner shielding layer and the outer insulation layer are sequentially fitted onto the main insulation layer from the inside to the outside. The connecting housing is fitted onto the outer insulation layer, and an installation gap is provided between the connecting housing and the end of the outer insulation layer near the contact electrode. The upper flange is fitted onto the outer insulation layer, and its end near the lower electrode is located at the installation gap and is connected to the end of the connecting housing away from the lower electrode.

[0009] Its special feature is:

[0010] It also includes voltage testing terminals;

[0011] The voltage testing terminal is installed on the periphery of the upper flange, and its tail end passes through the upper flange and the outer insulation layer in sequence, and is electrically connected to the inner shielding layer. The voltage testing terminal is electrically insulated from the upper flange and the outer insulation layer.

[0012] Alternatively, the voltage testing terminal is installed on the periphery of the connecting housing, with its tail end passing through the connecting housing and the outer insulation layer in sequence, and electrically connected to the inner shielding layer, and the voltage testing terminal is electrically insulated from the connecting housing and the outer insulation layer.

[0013] Furthermore, an insulating layer is provided around the voltage testing terminal, and the voltage testing terminal is electrically insulated from the upper flange and the outer insulating layer through the insulating layer, or the voltage testing terminal is electrically insulated from the connecting housing and the outer insulating layer through the insulating layer.

[0014] Meanwhile, the present invention also provides another shielded pluggable surge arrester with voltage detection function, including the surge arrester body;

[0015] The surge arrester body is a rear-insertion shielded plug-in surge arrester body or a front-insertion shielded plug-in surge arrester body, including a main insulation layer, an outer insulation layer, an inner shielding layer and a connecting shell; the inner shielding layer, the outer insulation layer and the connecting shell are sequentially fitted onto the main insulation layer from the inside to the outside;

[0016] Its special feature is:

[0017] It also includes voltage testing terminals;

[0018] The voltage testing terminal is installed on the periphery of the connecting housing, and its tail end passes through the connecting housing and the outer insulation layer in sequence, and is electrically connected to the inner shielding layer. The voltage testing terminal is electrically insulated from the connecting housing and the outer insulation layer.

[0019] Furthermore, an insulating layer is provided around the voltage testing terminal, and the voltage testing terminal is electrically insulated from the connecting housing and the outer insulating layer through the insulating layer.

[0020] Furthermore, the voltage testing terminals are installed on the periphery of the connecting housing at positions corresponding to the front end of the conductive rod in the rear-mounted shielded surge arrester body or the front-mounted shielded surge arrester body.

[0021] The beneficial effects of this invention are:

[0022] 1. This invention uses a voltage detection terminal that is electrically connected to the internal shielding layer and insulated from the external shielding layer. After the surge arrester is energized, the voltage induced by stray capacitance inside the arrester is insulated from the external shielding layer and the arrester's output terminals. During normal operation, a voltage indicator can be connected to the voltage detection terminal to show whether the arrester is energized. This avoids the shortcomings of existing shielded plug-in surge arresters that rely on the internal cone to determine energization, which can easily mislead maintenance personnel.

[0023] 2. When partial discharge testing of a surge arrester is required, this invention allows for the connection of a partial discharge tester to the voltage detection test terminal without interrupting system and surge arrester power supply. The current generated by partial discharge inside the surge arrester is collected at the voltage detection test terminal through the internal shield and ultimately flows into the connected partial discharge tester. The partial discharge tester detects and displays the partial discharge quantity of the surge arrester through discharge signal processing. This avoids the problems of current shielded plug-in surge arrester testing, which requires removing the surge arrester and testing it with special testing fixtures, resulting in a large workload, high testing costs, and the need to disconnect the system high voltage for both removal and installation, which significantly impacts the normal operation of the system.

[0024] 3. When the surge arrester is operating normally and does not require connection to the live indicator and partial discharge tester, it can be electrically connected to the outer shield through conductive parts and finally grounded to avoid the inner shield potential floating and affecting the normal operation of the surge arrester. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0027] Figure 3 This is a structural schematic diagram of Embodiment 3 of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0029] Figure 5 This is a structural schematic diagram of Embodiment 5 of the present invention.

[0030] In the diagram: 1-Contact electrode, 2-Conductive rod, 3-Main insulation layer, 4-Inner shielding layer, 5-Voltage testing terminal, 6-Outer insulation layer, 7-Upper flange, 8-Connecting housing, 9-Upper electrode, 10-Voltage limiting element, 11-Lower electrode, 12-Lower flange, 13-Protective grounding terminal. Detailed Implementation

[0031] To make the objectives, advantages, and features of the present invention clearer, the following detailed description of a shielded pluggable surge arrester with voltage detection function, in conjunction with the accompanying drawings and specific embodiments, is provided. The advantages and features of the present invention will become clearer according to the following specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, used only to facilitate and clarify the explanation of the embodiments of the present invention; furthermore, the structures shown in the drawings are often part of the actual structure.

[0032] Example 1

[0033] See Figure 1 This embodiment describes a shielded pluggable surge arrester with voltage detection function, including a surge arrester body and voltage detection test terminals 5 installed on the surge arrester body.

[0034] Specifically, the surge arrester body mainly includes contact electrode 1, conductive rod 2, main insulation layer 3, inner shielding layer 4, outer insulation layer 6, upper flange 7, connecting shell 8, upper electrode 9, voltage limiting element 10, lower electrode 11, lower flange 12, and protective grounding terminal 13, etc.

[0035] The contact electrode 1 and the lower electrode 11 are respectively installed at the upper and lower ends of the main insulating layer 3. The conductive rod 2, the upper electrode 9, and the voltage limiting element 10 are sequentially arranged within the main insulating layer 3 along the direction from the contact electrode 1 to the lower electrode 11. The upper end of the conductive rod 2 is connected to the inner side of the contact electrode 1, and the lower side of the voltage limiting element 10 is connected to the inner side of the lower electrode 11. The plug portion at the upper end of the main insulating layer 3 is tapered, matching the size of the matching inner tapered socket.

[0036] The inner shielding layer 4, outer insulation layer 6, and connecting housing 8 are sequentially fitted onto the main insulation layer 3 from the inside out. The outer insulation layer 6 provides electrical insulation between the inner shielding layer 4 and the metal housing and upper flange 7. An installation gap is provided between the upper end of the connecting housing 8 and the upper end of the outer insulation layer 6. The upper flange 7 is installed on the outer insulation layer 6, with its lower end located at the installation gap and connected to the upper end of the connecting housing 8. The lower flange 12 is installed at the lower end of the connecting housing 8, and the protective grounding terminal 13 passes through the lower flange 12 and connects to the lower electrode 11.

[0037] The connecting housing 8 is made of a metallic material. Of course, in other embodiments of the present invention, the connecting housing 8 may also be made of a conductive non-metallic material. The inner shielding layer 4 is made of a metallic material or a conductive non-metallic material.

[0038] The voltage testing terminal 5 is made of conductive material and is installed around the upper flange 7. Its tail end passes through the upper flange 7 and the outer insulation layer 6 in sequence, and is electrically connected to the inner shielding layer 4. An insulating isolation layer is provided around the voltage testing terminal 5, and the voltage testing terminal 5 is electrically insulated from the upper flange 7 and the outer insulation layer 6 through the insulating isolation layer.

[0039] Example 2

[0040] See Figure 2 The difference between this embodiment and Embodiment 1 lies in the installation position of the voltage testing terminal 5. Specifically, in this embodiment, the voltage testing terminal 5 is installed on the periphery of the connecting housing 8, with its tail end passing through the connecting housing 8 and the outer insulating layer 6 in sequence, and electrically connected to the inner shielding layer 4. The voltage testing terminal 5 is electrically insulated from the connecting housing 8 and the outer insulating layer 6 through an insulating isolation layer. The remaining structure of this embodiment is the same as that of Embodiment 1.

[0041] Example 3

[0042] See Figure 3 The difference between this embodiment and Embodiment 1 is that the plug portion at the upper end of the main insulating layer 3 is configured as a right-angle plug. Of course, in other embodiments of the present invention, it can also be configured as a plug of any other angle. The remaining structure of this embodiment is the same as that of Embodiment 1.

[0043] Example 4

[0044] See Figure 4 This embodiment describes a shielded pluggable surge arrester with voltage detection function, comprising an arrester body and voltage detection test terminals 5.

[0045] Specifically, the surge arrester body in this embodiment is a rear-insertion shielded plug-in surge arrester body, including a conductive rod 2, a main insulation layer 3, an inner shielding layer 4, an outer insulation layer 6, a connecting shell 8, an upper electrode 9, and a lower electrode 11.

[0046] The main insulating layer 3 includes a plug segment and a main body segment. The upper end of the main body segment is integrally connected to the periphery of the plug segment, and the length direction of the main body segment is perpendicular to the length direction of the plug segment. A voltage limiting element 10 is disposed within the main body segment along its length direction, and an upper electrode 9 and a lower electrode 11 are respectively disposed at the upper and lower ends of the voltage limiting element 10. The conductive rod 2 is disposed along the length direction of the main body segment, with one end connected to the upper electrode 9 and the other end connected to the inner hole of the plug segment. The inner shielding layer 4, the outer insulating layer 6, and the connecting housing 8 are sequentially fitted onto the main insulating layer 3 from the inside out.

[0047] The voltage testing terminal 5 is installed on the periphery of the plug section of the main insulation layer 3 on the connecting housing 8 and at the front end of the conductive rod 2. Its tail end passes through the connecting housing 8 and the outer insulation layer 6 in sequence and is electrically connected to the inner shielding layer 4. An insulating isolation layer is provided on the periphery of the voltage testing terminal 5. The voltage testing terminal 5 is electrically insulated from the connecting housing 8 and the outer insulation layer 6 through the insulating isolation layer.

[0048] Example 5

[0049] See Figure 5 The difference between this embodiment and embodiment four is that the surge arrester body in this embodiment is a front-plug shielded plug-in surge arrester body, while the rest of the structure in this embodiment is the same as that in embodiment four.

Claims

1. A shielded pluggable surge arrester with voltage detection function, comprising a surge arrester body; The surge arrester body includes a main insulation layer (3), a contact electrode (1), a lower electrode (11), an outer insulation layer (6), an inner shielding layer (4), an upper flange (7), and a connecting housing (8); The contact electrode (1) and the lower electrode (11) are respectively installed at both ends of the main insulating layer (3). The inner shielding layer (4) and the outer insulating layer (6) are sequentially fitted onto the main insulating layer (3) from the inside to the outside. The connecting housing (8) is fitted onto the outer insulating layer (6), and an installation gap is provided between the connecting housing (8) and the end of the outer insulating layer (6) near the contact electrode (1). The upper flange (7) is fitted onto the outer insulating layer (6), and its end near the lower electrode (11) is located at the installation gap and is connected to the end of the connecting housing (8) away from the lower electrode (11). Its features are: It also includes voltage testing terminals (5); The voltage testing terminal (5) is installed on the periphery of the upper flange (7), and its tail end passes through the upper flange (7) and the outer insulation layer (6) in sequence, and is electrically connected to the inner shielding layer (4). The voltage testing terminal (5) is electrically insulated from the upper flange (7) and the outer insulation layer (6). Alternatively, the voltage testing terminal (5) is installed on the periphery of the connecting housing (8), with its tail end passing through the connecting housing (8) and the outer insulation layer (6) in sequence, and electrically connected to the inner shielding layer (4), and the voltage testing terminal (5) is electrically insulated from the connecting housing (8) and the outer insulation layer (6).

2. The shielded pluggable surge arrester with voltage detection function according to claim 1, characterized in that: An insulating layer is provided around the voltage testing terminal (5). The voltage testing terminal (5) is electrically insulated from the upper flange (7) and the outer insulating layer (6) through the insulating layer. Alternatively, the voltage testing terminal (5) is electrically insulated from the connecting housing (8) and the outer insulating layer (6) through the insulating layer.

3. A shielded pluggable surge arrester with voltage detection function, comprising a surge arrester body; The surge arrester body is a rear-insertion shielded plug-in surge arrester body or a front-insertion shielded plug-in surge arrester body, including a main insulation layer (3), an outer insulation layer (6), an inner shielding layer (4) and a connecting shell (8); the inner shielding layer (4), the outer insulation layer (6) and the connecting shell (8) are sequentially fitted onto the main insulation layer (3) from the inside to the outside; Its features are: It also includes voltage testing terminals (5); The voltage testing terminal (5) is installed on the periphery of the connecting housing (8), and its tail end passes through the connecting housing (8) and the outer insulation layer (6) in sequence, and is electrically connected to the inner shielding layer (4). The voltage testing terminal (5) is electrically insulated from the connecting housing (8) and the outer insulation layer (6).

4. The shielded pluggable surge arrester with voltage detection function according to claim 3, characterized in that: An insulating layer is provided around the voltage testing terminal (5), and the voltage testing terminal (5) is electrically insulated from the connecting housing (8) and the outer insulating layer (6) through the insulating layer.

5. The shielded pluggable surge arrester with voltage detection function according to claim 3 or 4, characterized in that: The voltage testing terminal (5) is installed on the periphery of the connecting housing (8) at the position corresponding to the front end of the conductive rod (2) in the rear-mounted shielded plug-in surge arrester body or the front-mounted shielded plug-in surge arrester body.

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