Shielding type plug-in lightning arrester with electricity testing function

Abstract

The utility model 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 utility model, the arranged 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] The utility model relates to a lightning arrester, in particular to a shielded plug-in lightning arrester with an electrical testing function. Background Art

[0002] With the increasing use of C-GIS inflatable switchgear and ring network cabinets in the power industry, the use of shielded pluggable lightning arresters is also increasing.

[0003] The power frequency partial discharge test is one of the important test methods to measure the operational reliability of the arrester. However, the shielded plug-in arresters in the industry are usually not equipped with a partial discharge test interface. When conducting a power frequency partial discharge test on the arrester, the arrester needs to be removed from the system and then tested with a special test tool. The workload is large and the test cost is high. At the same time, both removal and installation require the system to be powered off at high voltage, which has a great impact on the normal operation of the system. On the other hand, the arrester does not have a live display function. Whether the arrester is live when running in the system does not have a direct display function. It can often only indirectly judge whether the arrester is live by connecting the live display device through the test hole set in the matching inner cone casing. If the arrester is not installed in place or the size does not match, resulting in the arrester contact electrode and the conductive rod of the inner cone socket not being reliably connected, although the inner cone casing is live, the arrester is not live. In this case, judging whether the arrester is live by the inner cone is easy to mislead the operation and maintenance personnel. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that the existing shielded plug-in lightning arrester needs to be removed from the system during the power frequency partial discharge test, and then the lightning arrester is tested by special test tooling, which has a large workload and high test cost. At the same time, both removal and installation require the system high voltage power off, which affects the normal operation of the system; on the other hand, the lightning arrester does not have a live display function, and judging whether the lightning arrester is live by the inner cone can easily mislead the operation and maintenance personnel. A shielded plug-in lightning arrester with an electrical test function is provided.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A shielded plug-in arrester with an electrical testing function, comprising an arrester body;

[0007] The arrester body comprises a main insulating layer, a contact electrode, a lower electrode, an outer insulating layer, an inner shielding layer, an upper flange and a connecting shell;

[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 sleeved on the main insulation layer from the inside to the outside. The connecting housing is sleeved on the outer insulation layer, and there is an installation gap between the connecting housing and one end of the outer insulation layer close to the contact electrode. The upper flange is sleeved on the outer insulation layer, one end thereof close to the lower electrode is located at the installation gap, and is connected to one end of the connecting housing far from the lower electrode.

[0009] Its special feature lies in that:

[0010] It further includes a live test terminal.

[0011] The live test terminal is installed on the circumferential side of the upper flange. Its tail end sequentially passes through the upper flange and the outer insulation layer and is electrically connected to the inner shielding layer, and the live test terminal is electrically insulated from the upper flange and the outer insulation layer.

[0012] Alternatively, the live test terminal is installed on the circumferential side of the connecting housing. Its tail end sequentially passes through the connecting housing and the outer insulation layer and is electrically connected to the inner shielding layer, and the live test terminal is electrically insulated from the connecting housing and the outer insulation layer.

[0013] Furthermore, an insulating isolation layer is provided on the circumferential side of the live test terminal. The live test terminal is electrically insulated from the upper flange and the outer insulation layer through the insulating isolation layer, or the live test terminal is electrically insulated from the connecting housing and the outer insulation layer through the insulating isolation layer.

[0014] Meanwhile, the present utility model also provides another shielded plug-in type lightning arrester with a live test function, including a lightning arrester body.

[0015] The lightning arrester body is a rear-insert type shielded plug-in lightning arrester body or a front-insert type shielded plug-in lightning arrester body, and includes a main insulation layer, an outer insulation layer, an inner shielding layer and a connecting housing. The inner shielding layer, the outer insulation layer and the connecting housing are sequentially sleeved on the main insulation layer from the inside to the outside.

[0016] Its special feature lies in that:

[0017] It further includes a live test terminal.

[0018] The live test terminal is installed on the circumferential side of the connecting housing. Its tail end sequentially passes through the connecting housing and the outer insulation layer and is electrically connected to the inner shielding layer, and the live test terminal is electrically insulated from the connecting housing and the outer insulation layer.

[0019] Furthermore, an insulating isolation layer is provided on the circumferential side of the live test terminal. The live test terminal is electrically insulated from the connecting housing and the outer insulation layer through the insulating isolation layer.

[0020] Furthermore, the live testing terminal is installed on the circumferential side of the connection housing at a position corresponding to the front end of the conductive rod in the rear-insert type shielded plug-in lightning arrester body or the front-insert type shielded plug-in lightning arrester body.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. By providing the live testing terminal in the present utility model, it is electrically connected to the internal shielding layer and insulated from the external shielding layer. After the lightning arrester operates live, the voltage induced by the stray capacitance inside the lightning arrester is insulated from the external shielding layer and between the outgoing terminals of the lightning arrester. When the lightning arrester operates normally, a live indicator can be connected at the live testing terminal to indicate whether the lightning arrester is live, which can avoid the deficiency that the existing shielded plug-in lightning arrester judges whether the lightning arrester is live through the inner cone, which is likely to mislead the operation and maintenance personnel.

[0023] 2. When it is necessary to conduct partial discharge testing on the lightning arrester, in the present utility model, without power outage of the system and without power outage of the lightning arrester, a partial discharge tester can be connected at the live testing terminal. The current generated by the partial discharge inside the lightning arrester is collected at the live testing terminal through the inner shield and finally flows into the connected partial discharge tester. The partial discharge tester realizes the detection and display of the partial discharge quantity of the lightning arrester through the processing of the discharge signal, which can avoid the problems that when testing the current shielded plug-in lightning arrester, it is necessary to remove the lightning arrester and then conduct tests on the lightning arrester through a special test tooling, with a large workload, high test cost, and the need for the system to be de-energized at high voltage for both removal and installation, which has a great impact on the normal operation of the system.

[0024] 3. When the lightning arrester operates normally and there is no need to connect a live indicator and a partial discharge tester, it can be electrically connected to the external shield through a conductive part and finally grounded to avoid the floating potential of the inner shield affecting the normal operation of the lightning arrester. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0026] Figure 2 is a schematic structural diagram of Embodiment 2 of the present utility model;

[0027] Figure 3 is a schematic structural diagram of Embodiment 3 of the present utility model;

[0028] Figure 4 is a schematic structural diagram of Embodiment 4 of the present utility model;

[0029] Figure 5 is a schematic structural diagram of Embodiment 5 of the present utility model.

[0030] In the figure: 1 - contact electrode, 2 - conducting rod, 3 - main insulation layer, 4 - inner shielding layer, 5 - voltage detection test terminal, 6 - outer insulation layer, 7 - upper flange, 8 - connection 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 utility model clearer, the following further details a shielded plug-in type lightning arrester with a voltage detection test function proposed by the present utility model in conjunction with the accompanying drawings and specific embodiments. According to the following detailed implementation, the advantages and features of the present utility model will be clearer. It should be noted that: the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the objectives of the embodiments of the present utility model; secondly, the structures shown in the drawings are often part of the actual structures.

[0032] Embodiment 1

[0033] Refer to Figure 1 , a shielded plug-in type lightning arrester with a voltage detection test function in this embodiment includes a lightning arrester body and a voltage detection test terminal 5 installed on the lightning arrester body.

[0034] Specifically, the lightning arrester body mainly includes a contact electrode 1, a conducting rod 2, a main insulation layer 3, an inner shielding layer 4, an outer insulation layer 6, an upper flange 7, a connection housing 8, an upper electrode 9, a voltage-limiting element 10, a lower electrode 11, a lower flange 12, and a protective grounding terminal 13, etc.

[0035] Among them, the contact electrode 1 and the lower electrode 11 are respectively installed at the upper and lower ends of the main insulation layer 3. The conducting rod 2, the upper electrode 9, and the voltage-limiting element 10 are sequentially arranged in the main insulation layer 3 along the direction from the contact electrode 1 to the lower electrode 11. The upper end of the conducting 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 upper plug part of the main insulation layer 3 is conical and matches the size of the matching inner conical socket.

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

[0037] The connecting housing 8 is made of a metallic material. Of course, in other embodiments of the present utility model, the connecting housing 8 can 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 power verification test terminal 5 is made of a conductive material and is installed on the periphery of the upper flange 7. Its tail end sequentially passes through the upper flange 7 and the outer insulating layer 6 and is electrically connected to the inner shielding layer 4. And an insulating isolation layer is provided on the periphery of the power verification test terminal 5, and the power verification test terminal 5 is electrically insulated from the upper flange 7 and the outer insulating layer 6 through the insulating isolation layer.

[0039] Embodiment 2

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

[0041] Embodiment 3

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

[0043] Embodiment 4

[0044] See Figure 4 , a shielding type pluggable lightning arrester with a power verification test function in this embodiment includes a lightning arrester body and a power verification test terminal 5.

[0045] Specifically, the lightning arrester body in this embodiment is a rear-insert type shielding plug-in lightning arrester body, including a conductive rod 2, a main insulating layer 3, an inner shielding layer 4, an outer insulating layer 6, a connecting housing 8, an upper electrode 9 and a lower electrode 11.

[0046] Wherein, the main insulating layer 3 includes a plug section and a main body section; the upper end of the main body section is integrally connected to the periphery of the plug section, and the length direction of the main body section is perpendicular to the length direction of the plug section. The voltage-limiting element 10 is arranged therein along the length direction of the main body section, and the upper electrode 9 and the lower electrode 11 are respectively arranged at the upper and lower ends of the voltage-limiting element 10. The length direction of the conductive rod 2 is arranged along the length direction of the main body section, one end of which is connected to the upper electrode 9, and the other end is connected to the inner hole of the plug section. The inner shielding layer 4, the outer insulating layer 6 and the connecting housing 8 are sleeved on the main insulating layer 3 in sequence from inside to outside.

[0047] The live-line testing terminal 5 is installed on the circumferential side of the connection housing 8 at the plug section of the main insulation layer 3 and at the front end of the conductive rod 2. Its tail end sequentially passes through the connection housing 8 and the outer insulation layer 6 and is electrically connected to the inner shielding layer 4. An insulating isolation layer is provided on the circumferential side of the live-line testing terminal 5, and the live-line testing terminal 5 is electrically insulated from the connection housing 8 and the outer insulation layer 6 through the insulating isolation layer.

[0048] Embodiment 5

[0049] See Figure 5 , the difference between this embodiment and Embodiment 4 is that the arrester body of this embodiment is a front-insertion type shielded plug-in arrester body, and the rest of the structure of this embodiment is the same as that of Embodiment 4.

Claims

1. A shielded plug-in arrester with an electrical test function, comprising an arrester body; The arrester body comprises a main insulating layer (3), a contact electrode (1), a lower electrode (11), an outer insulating layer (6), an inner shielding layer (4), an upper flange (7) and a connecting shell (8); The contact electrode (1) and the lower electrode (11) are respectively mounted on the two ends of the main insulating layer (3); the inner shielding layer (4) and the outer insulating layer (6) are sequentially mounted on the main insulating layer (3) from the inside to the outside; the connecting shell (8) is mounted on the outer insulating layer (6), and a mounting gap is provided between the connecting shell (8) and an end of the outer insulating layer (6) close to the contact electrode (1); the upper flange (7) is mounted on the outer insulating layer (6), and an end of the upper flange (7) close to the lower electrode (11) is located at the mounting gap, and is connected to an end of the connecting shell (8) away from the lower electrode (11); Features: Also includes an electrical test terminal (5); The electrical test terminal (5) is installed on the peripheral side of the upper flange (7), and its tail end passes through the upper flange (7) and the outer insulating layer (6) in sequence, and is electrically connected to the inner shielding layer (4), and the electrical test terminal (5) is electrically insulated from the upper flange (7) and the outer insulating layer (6); Alternatively, the electrical test terminal (5) is installed on the peripheral side of the connecting shell (8), and its tail end passes through the connecting shell (8) and the outer insulating layer (6) in sequence to be electrically connected to the inner shielding layer (4), and the electrical test terminal (5) is electrically insulated from the connecting shell (8) and the outer insulating layer (6).

2. The shielded plug-in arrester with electrical testing function according to claim 1 is characterized in that: An insulating isolation layer is provided on the peripheral side of the electrical test terminal (5), and the electrical test terminal (5) is electrically insulated from the upper flange (7) and the outer insulating layer (6) through the insulating isolation layer, or the electrical test terminal (5) is electrically insulated from the connecting shell (8) and the outer insulating layer (6) through the insulating isolation layer.

3. A shielded plug-in arrester with an electrical test function, comprising an arrester body; The arrester body is a rear-insertion shielded plug-in arrester body or a front-insertion shielded plug-in arrester body, comprising a main insulating layer (3), an outer insulating layer (6), an inner shielding layer (4) and a connecting shell (8); the inner shielding layer (4), the outer insulating layer (6) and the connecting shell (8) are sequentially mounted on the main insulating layer (3) from the inside to the outside; Features: Also includes an electrical test terminal (5); The electrical test terminal (5) is installed on the peripheral side of the connection shell (8), and its tail end passes through the connection shell (8) and the outer insulating layer (6) in sequence to be electrically connected to the inner shielding layer (4), and the electrical test terminal (5) is electrically insulated from the connection shell (8) and the outer insulating layer (6).

4. The shielded plug-in arrester with electrical testing function according to claim 3 is characterized in that: An insulating isolation layer is provided on the peripheral side of the electrical test terminal (5), and the electrical test terminal (5) is electrically insulated from the connection housing (8) and the outer insulating layer (6) via the insulating isolation layer.

5. The shielded plug-in arrester with electrical testing function according to claim 3 or 4, characterized in that: The electrical testing terminal (5) is installed on the peripheral side of the connecting shell (8) at a position corresponding to the front end of the conductive rod (2) in the rear-insertion shielded plug-in arrester body or the front-insertion shielded plug-in arrester body.

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