EVT lower-connection shielding type separable connector

Abstract

The utility model discloses an EVT lower-connection shielding type separable connector, and relates to the field of cable accessories, in particular to an EVT lower-connection shielding type separable connector. Comprising a front plugging device and a rear plugging device, and the rear end of the front plugging device is detachably plugged with the front end of the rear plugging device; the outer walls of the front insertion device and the rear insertion device are completely wrapped with external semi-conductive layers; a detachable voltage sensor is arranged at the bottom end of the rear plug-in device; the rear end of the rear insertion device is provided with a detachable rear plug and a rear sealing cap. A fixing structure is arranged on the surface of the inner wall of the rear sealing cap, the fixing structure is connected with the electricity testing point of the rear plug, and the outer wall semi-conductive layer of the rear plug device is electrically communicated with the rear sealing cap. The rear sealing cap can be prevented from falling off, the structure is simple, the safety and the stability are high, and a full-shielding function can be formed. Meanwhile, the voltage sensor is used for high-voltage measurement protection and providing voltage signals of a power grid, and has the effects of simple and convenient installation, low power consumption and high accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cable accessories, in particular to an EVT lower connection type shielding separable connector. BACKGROUND

[0002] In 2016, State Grid proposed the concept of realizing power grid primary and secondary integration, (the first step is complete set, and the second step is integration) in order to achieve the purpose of complete set, a voltage sensor (EVT) was developed and put into the market and widely used. The EVT voltage sensor is a kind of sensing device for high voltage measurement and protection, which mainly provides voltage signals of the power grid for measurement and protection devices and power automation systems. The EVT voltage sensor has the advantages of simple installation, low power consumption, high accuracy, etc. The secondary side of the sensor outputs a small voltage signal, and there is no need for secondary PT conversion. It can be directly input into the secondary device through A / D conversion. It meets the needs of the development of digital and intelligent power grid equipment.

[0003] The EVT is usually installed at the rear plug position of the ring net cabinet separable connector. This installation method requires a large installation space to be reserved for the ring net cabinet, which is not suitable for small-sized ring net cabinets and cannot adapt to the current trend of miniaturization.

[0004] At present, the shielding separable connector produced by various manufacturers in the related art is divided into front insertion devices and rear insertion devices. The front insertion device and the rear insertion device are both composed of an inner shielding layer, an insulating layer and an outer shielding layer in a whole. A rear cap is installed at the rear end of the shielding separable connector during use. The rear cap may stick to the silicone grease in the shielding separable connector during installation of the rear cap, or the elastic force generated by the insulating layer in the shielding separable connector under certain conditions may act on the rear cap. These conditions can all cause the rear cap to fall off from the rear end of the shielding separable connector, affect the full shielding function, and exist certain safety hazards. Content of the utility model

[0005] In view of the above problems, the present application provides an EVT lower connection type shielding separable connector which has reasonable structure, high safety and stability and can form a full shielding function.

[0006] The present application adopts the following technical solutions:

[0007] An EVT lower joint type shielding separable connector comprises a front plug device and a rear plug device, the outer wall of the front plug device is provided with a first semi-conductive layer, the outer wall of the rear plug device is provided with a second semi-conductive layer, the rear end of the front plug device is separably plugged with the front end of the rear plug device; a detachable rear plug and a rear cap are arranged on the rear end of the rear plug device, and a voltage sensor is arranged on the bottom end of the rear plug device; the rear plug and the rear cap cooperate to prevent the rear cap from falling off; the rear plug comprises an electricity testing point, a third insulating layer and a threaded insert; the rear cap comprises a rear cover panel and a mounting wall fixedly connected with the inner side of the rear cover panel, a fixing structure is arranged on the mounting wall, the fixing structure is connected with the electricity testing point of the rear plug, and the second semi-conductive layer of the rear plug device is in electrical conduction with the rear cap.

[0008] Further, a first cable main channel and a first cable auxiliary channel are formed in the inner cavity of the front plug device in communication, the first cable main channel is arranged in a horizontal direction, and the first cable auxiliary channel is arranged vertically at the lower part of the first cable main channel; a second cable main channel and a second cable auxiliary channel are formed in the inner cavity of the rear plug device in communication, the second cable main channel is arranged in a horizontal direction, and the second cable auxiliary channel is arranged vertically at the lower part of the second cable main channel; the threaded insert of the rear plug is arranged in the second cable main channel close to the front plug device, the electricity testing point is arranged in the second cable main channel close to the rear cap, and the third insulating layer is arranged between the threaded insert and the electricity testing point.

[0009] Further, the fixing structure is provided with a circular groove, and a circular ring-shaped first limiting protrusion is arranged on the inner wall of the circular groove.

[0010] Further, the electricity testing point of the rear plug is provided with a circular ring-shaped second limiting protrusion which can tightly cooperate with the fixing structure.

[0011] Further, the first semi-conductive layer comprises a first inner shielding layer, a first insulating layer and a first outer shielding layer from inside to outside, the second semi-conductive layer comprises a second inner shielding layer, a second insulating layer and a second outer shielding layer from inside to outside, and the outer wall of the second outer shielding layer of the front end of the rear plug device abuts against the outer wall of the first outer shielding layer of the rear end of the front plug device.

[0012] Further, a first grounding device is arranged on the first outer shielding layer.

[0013] Further, a second grounding device is arranged on the second outer shielding layer.

[0014] Further, the voltage sensor is arranged at the lower part of the second cable auxiliary channel.

[0015] Further, a conductive metal pipe is fixedly sleeved on the inner side of the front end of the rear plug device, one end of the conductive metal pipe is sleeved on the second inner shielding layer of the rear plug device, and the other end of the conductive metal pipe is connected with the first inner shielding layer of the front plug device.

[0016] Further, the conductive metal pipe is an aluminum pipe.

[0017] The application provides an EVT lower connection type shielded separable connector, which has the following beneficial effects:

[0018] 1. The application is provided with a fixing structure on the inner wall surface of the rear cap, and the rear cap is fixed on the voltage detection point of the rear plug through the fixing structure, thereby effectively preventing the rear plug from falling off; and an EVT voltage sensor is detachably installed on the bottom end of the rear plug device, thereby effectively saving installation space, being more suitable for miniaturization, and meeting the needs of digitalization and intelligentization of power grid equipment.

[0019] 2. The conductive metal pipe can further shield the induced electric field generated by the cable terminal, and the inner shield layer is connected to the conductive metal pipe, so that the interiors of the rear plug device and the front plug device are completely shielded, the shielding effect is further improved, and the application has higher safety. The aluminum pipe makes the shielding effect of the application better. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the application, the drawings needed in the following embodiment description will be briefly introduced as follows:

[0021] FIG. 1 is a sectional view of the separable connector according to the application. Figure 1 FIG. 2 is an enlarged view of position A in FIG. 1.

[0022] FIG. 3 is a sectional view of the separable front plug device and the separable rear plug device according to the application. Figure 2 FIG. 4 is a sectional view of the EVT lower connection type separable rear plug device according to the application. Figure 1 FIG. 5 is an enlarged view of position A in FIG. 4.

[0023] FIG. 6 is a sectional view of the EVT lower connection type separable rear plug device according to the application. Figure 3 FIG. 7 is a sectional view of the EVT lower connection type separable rear plug device according to the application.

[0024] FIG. 8 is a sectional view of the EVT lower connection type separable rear plug device according to the application. Figure 4 FIG. 9 is a sectional view of the EVT lower connection type separable rear plug device according to the application.

[0025] FIG. 10 is a sectional view of the EVT lower connection type separable rear plug device according to the application. DETAILED DESCRIPTION

[0026] The application will be described in detail below with reference to the drawings.Figures 1-4 The present application will be further described in detail with reference to specific embodiments.

[0027] This application discloses an EVT bottom-mounted shielded detachable connector 100, with reference to... Figures 1-3 It includes a front insertion device 1 and a rear insertion device 2. The rear end of the front insertion device 1 is detachably inserted into the front end of the rear insertion device 2, and the front end of the rear insertion device 2 can be inserted into the rear end of the front insertion device 1. The outer wall of the front insertion device 1 is provided with a first semiconducting layer, and the outer wall of the rear insertion device 2 is provided with a second semiconducting layer. The inner cavity of the front insertion device 1 forms a first main cable channel and a first secondary cable channel that are connected. The first main cable channel is set in a horizontal direction, and the first secondary cable channel is set vertically at the lower part of the first. The inner cavity of the rear insertion device 2 forms a second main cable channel and a second secondary cable channel that are connected. The second main cable channel is set in a horizontal direction, and the second secondary cable channel is set vertically at the lower part of the second.

[0028] A rear sealing cap 3 and a rear plug 4 with sealing function can be detachably installed on the rear end of the rear insertion device 2. The rear plug 4 and the rear sealing cap 3 cooperate to prevent the rear sealing cap 3 from falling off.

[0029] The rear plug 4 includes a voltage detection point 41, a third insulating layer 42, and a threaded insert 43. The threaded insert 43 of the rear plug 4 is disposed within the second main cable channel near the front insertion device 1, and the voltage detection point 41 is disposed within the second main cable channel near the rear cap 3. The third insulating layer 42 is disposed between the threaded insert 43 and the voltage detection point 41. In this embodiment, the third insulating layer 42 is an epoxy resin insulating layer.

[0030] The rear cap 3 includes a rear sealing panel 31 and a mounting wall 32 fixedly connected to the inner side of the rear sealing panel 31. A fixing structure 33 is provided on the mounting wall 32. The fixing structure 33 is connected to the voltage testing point 41 of the rear plug 4. The outer wall semiconducting layer of the rear insertion device 2 is electrically connected to the rear cap 3.

[0031] Reference Figure 1 and Figure 2 The fixing structure 33 is provided with a circular groove, and the inner wall of the circular groove is provided with a first annular limiting protrusion 37. The voltage testing point 41 of the rear plug 4 is provided with a second annular limiting protrusion 47, which can fit tightly with the fixing structure 33. After the installation of the rear plug 4 and the rear cap 3 is completed, the first annular limiting protrusion 37 increases the rebound force, so that the rear cap 3 is tightly fixed on the voltage testing point 41 of the rear plug 4. This ensures long-term stability and prevents it from falling off. Moreover, the rear cap 3 is fully shielded and sealed to the outer wall of the rear end of the rear insertion device 2, avoiding incomplete shielding and sealing caused by the rear cap 3 falling off during rainy seasons, humid climates, and when the moisture content in the air is high. This avoids the potential for accidents caused by creepage and flashover.

[0032] Reference Figure 1 and Figure 3 The first semiconductor layer comprises, from the inside out, a first inner shielding layer 13, a first insulating layer 12, and a first outer shielding layer 11. The second semiconductor layer comprises, from the inside out, a second inner shielding layer 23, a second insulating layer 22, and a second outer shielding layer 21. The outer wall of the second outer shielding layer 21 at the front end of the rear insertion device 2 abuts against the outer wall of the first outer shielding layer 11 at the rear end of the front insertion device 1. This design ensures that even if the front insertion device 1 and the rear insertion device 2 are not properly installed or are subjected to thermal expansion and contraction, the first outer shielding layer 11 remains connected to the second outer shielding layer 21, preventing the formation of an electrical gap and eliminating safety hazards during routine live maintenance or live insertion / removal.

[0033] Reference Figure 3 A first grounding device 14 is provided on the first outer shielding layer 11. In this embodiment, the first inner shielding layer 13, the first insulating layer 12, and the first outer shielding layer 11 are respectively injection molded from three different materials of EPDM rubber. The three-layer injection process effectively ensures the interface performance, avoids interlayer gaps, minimizes partial discharge, and ensures the reliable operation of the power supply system.

[0034] Reference Figure 1 , Figure 3 and Figure 4 A second grounding device 24 is provided on the second outer shielding layer 21, and a voltage sensor 25 for high voltage measurement and protection can be detachably installed on the bottom end of the rear insertion device 2. In this embodiment, the voltage sensor is set as an EVT voltage sensor, and the voltage sensor 25 is set at the lower part of the second cable sub-channel. The voltage sensor 25 is installed at the bottom of the rear insertion device 2, which effectively saves installation space, is more suitable for the trend of miniaturization, and meets the needs of the digital and intelligent development of power grid equipment.

[0035] Reference Figure 3 A conductive metal tube 26, which is made of aluminum, is fixedly sleeved on the inner side of the front end of the rear insertion device 2. One end of the conductive metal tube 26 is sleeved on the second inner shielding layer 23 of the rear insertion device 2, and the other end is connected in parallel with the first inner shielding layer 13 of the front insertion device 1. The conductive metal tube 26 can further shield the induced electric field generated by the cable terminal, and its connection with the second inner shielding layer 23 and the first inner shielding layer 13 enables complete shielding of the interior of the rear insertion device 2 and the front insertion device 1, further improving the shielding effect and giving this application higher security. The use of the aluminum tube further enhances the shielding effect of this application.

[0036] Reference Figure 1The second outer shielding layer 21 extends from the end face of the first outer shielding layer 11. When the rear insertion device 2 is connected to other connecting devices, the second outer shielding layer 21 can cover the other connecting devices, thereby further improving the security of this application.

[0037] In this embodiment, after the rear plug 4 and the rear cap 3 are installed, they fit tightly together. The rear cap 3 is fully shielded and sealed to the outer wall of the rear end of the rear insertion device 2, avoiding incomplete shielding and sealing caused by the rear cap 3 falling off. Even if the front insertion device 1 and the rear insertion device 2 are not installed properly or under thermal expansion and contraction, the first outer shielding layer 11 is always connected to the second outer shielding layer 21, and no electrical gap will be formed. The semiconductor layer consists of three layers forming a whole. The three-layer injection process effectively ensures the interface performance, avoids interlayer gaps, and minimizes partial discharge. The setting of the voltage sensor 25 effectively saves installation space and is more suitable for the trend of miniaturization. The conductive metal tube 26 can further shield the induced electric field generated by the cable terminal and is connected to the second inner shielding layer 23 and the first inner shielding layer 13 to achieve complete shielding of the interior of the rear insertion device 2 and the front insertion device 1.

[0038] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. An EVT bottom-mounted shielded detachable connector, comprising a front insertion device (1) and a rear insertion device (2), wherein the outer wall of the front insertion device (1) is provided with a first semiconducting layer, and the outer wall of the rear insertion device (2) is provided with a second semiconducting layer, wherein the rear end of the front insertion device (1) and the front end of the rear insertion device (2) are detachably inserted; wherein the rear end of the rear insertion device (2) is provided with a detachable rear plug (4) and a rear cap (3), characterized in that, A detachable voltage sensor (25) is provided at the bottom of the rear insertion device (2); the rear plug (4) and the rear cap (3) cooperate to prevent the rear cap (3) from falling off; the rear plug (4) includes a voltage testing point (41), a third insulating layer (42) and a threaded insert (43); the rear cap (3) includes a rear sealing panel (31) and a mounting wall (32) fixedly connected to the inner side of the rear sealing panel (31), a fixing structure (33) is provided on the mounting wall (32), the fixing structure (33) is connected to the voltage testing point (41) of the rear plug (4), and the second semiconducting layer of the rear insertion device (2) is electrically connected to the rear cap (3).

2. The EVT bottom-mounted shielded detachable connector according to claim 1, characterized in that, The inner cavity of the front insertion device (1) forms a first main cable channel and a first secondary cable channel, the first main cable channel is set in the horizontal direction, and the first secondary cable channel is set vertically at the lower part of the first; the inner cavity of the rear insertion device (2) forms a second main cable channel and a second secondary cable channel, the second main cable channel is set in the horizontal direction, and the second secondary cable channel is set vertically at the lower part of the second; the threaded insert (43) of the rear plug (4) is set in the second main cable channel near the front insertion device (1), the voltage detection point (41) is set in the second main cable channel near the rear cap (3), and a third insulating layer (42) is set between the threaded insert (43) and the voltage detection point (41).

3. The EVT bottom-mounted shielded detachable connector according to claim 1, characterized in that, The fixing structure (33) is provided with a circular groove, and the inner wall of the circular groove is provided with a first annular limiting protrusion (37).

4. An EVT bottom-mounted shielded detachable connector according to claim 1 or 3, characterized in that, The voltage testing point (41) of the rear plug (4) is provided with a circular second limiting protrusion (47), which can be closely matched with the fixing structure (33).

5. The EVT bottom-mounted shielded detachable connector according to claim 2, characterized in that, The first semiconductor layer includes, from the inside out, a first inner shielding layer (13), a first insulating layer (12), and a first outer shielding layer (11). The second semiconductor layer includes, from the inside out, a second inner shielding layer (23), a second insulating layer (22), and a second outer shielding layer (21). The outer wall of the second outer shielding layer (21) at the front end of the rear insertion device (2) abuts against the outer wall of the first outer shielding layer (11) at the rear end of the front insertion device (1).

6. The EVT bottom-mounted shielded detachable connector according to claim 5, characterized in that, A first grounding device (14) is provided on the first outer shielding layer (11).

7. The EVT bottom-mounted shielded detachable connector according to claim 5, characterized in that, A second grounding device (24) is provided on the second outer shielding layer (21).

8. The EVT bottom-mounted shielded detachable connector according to claim 2, characterized in that, The voltage sensor (25) is located at the lower part of the second cable sub-channel.

9. The EVT bottom-mounted shielded detachable connector according to claim 5, characterized in that, A conductive metal tube (26) is fixedly sleeved on the inner side of the front end of the rear insertion device (2). One end of the conductive metal tube (26) is sleeved on the second inner shielding layer (23) of the rear insertion device (2), and the other end is connected in parallel with the first inner shielding layer (13) of the front insertion device (1).

10. The EVT bottom-mounted shielded detachable connector according to claim 9, characterized in that, The conductive metal tube (26) is an aluminum tube.

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