A cable insulation voltage test device

Abstract

The utility model discloses a cable insulation voltage test testing arrangement, with the help of first sealing component, can realize the sealing between the first end of bushing component and cable, especially with the help of first sealing plug, can improve the sealing between the hole wall of first through -hole and the outside wall of cable, at the same time, with the help of second sealing component, can realize the sealing between the second end of bushing component and cable, especially with the help of second sealing plug, can improve the sealing between the hole wall of second through -hole and the outside wall of cable, at the same time, with the help of second pressing plate and press down second sealing plug, can avoid the second sealing plug and fall off.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable test technical field especially relates to a cable insulation voltage test testing arrangement. BACKGROUND

[0002] Power cable is the main element of the main network of the power system, and its main function is to transmit and distribute electric energy. Cross-linked polyethylene cable is widely used in power systems and electrical engineering, and the performance of its insulation material directly determines the safety and reliability of the cable. Breakdown strength is a core index for measuring the electric field resistance of insulation material. In order to ensure the stable operation of the power system, the insulation breakdown strength test is required before the cable is shipped and after installation. In the related art, the sealing effect of the device for testing the insulation breakdown strength of the cable is poor, which can easily reduce the accuracy of the test results, and there is also a great safety hazard. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art. Therefore, the utility model provides a cable insulation voltage test testing arrangement with better sealing effect.

[0004] The cable insulation voltage test testing arrangement according to some embodiments of the utility model comprises: a sleeve assembly, the sleeve assembly has a first end and a second end opposite to the first end; a first sealing assembly, the first sealing assembly is arranged at the first end, the first sealing assembly comprises a first flange, a first sealing plug and a first pressing plate, the first flange is connected to the first end, the first flange is provided with a first through hole for the cable to pass through, the first through hole is communicated with the internal space of the sleeve assembly, at least part of the first sealing plug is inserted into the first through hole and used for abutting against the outer side wall of the cable, the first pressing plate is connected to the first flange and tightly presses the first sealing plug between the hole wall of the first through hole and the outer side wall of the cable; a second sealing assembly, the second sealing assembly is arranged at the second end, the second sealing assembly comprises a second flange, a second sealing plug and a second pressing plate, the second flange is connected to the second end, the second flange is provided with a second through hole for the cable to pass through, the second through hole is communicated with the internal space of the sleeve assembly, at least part of the second sealing plug is inserted into the second through hole and used for abutting against the outer side wall of the cable, and the second pressing plate is connected to the second flange and tightly presses the second sealing plug between the hole wall of the second through hole and the outer side wall of the cable. The cable insulation voltage test testing arrangement according to the embodiments of the utility model has at least the following beneficial effects: The utility model discloses a cable insulation voltage test testing arrangement, with the first sealing component can realize the sealing between the first end of bushing assembly and cable, especially with the first sealing plug can improve the sealing between the hole wall of first through -hole and the outside wall of cable, simultaneously, with the second sealing component can realize the sealing between the second end of bushing assembly and cable, especially with the second sealing plug can improve the sealing between the hole wall of second through -hole and the outside wall of cable, simultaneously, with the second pressing plate pressing the second sealing plug, can avoid the second sealing plug to fall off.

[0005] According to some embodiments of the utility model, the first through -hole gradually reduces along the direction of the first end to the second end; the first sealing plug gradually reduces along the direction of the first end to the second end.

[0006] According to some embodiments of the utility model, the first pressing plate is arranged on the side of the first flange away from the second end, and the first pressing plate abuts on the side of the first sealing plug away from the second end.

[0007] According to some embodiments of the utility model, the first pressing plate is provided with a first via hole arranged opposite to the first through -hole, and the first via hole is used for the cable to pass through.

[0008] According to some embodiments of the utility model, the second through -hole gradually reduces along the direction of the second end to the first end; the second sealing plug gradually reduces along the direction of the second end to the first end.

[0009] According to some embodiments of the utility model, the second pressing plate is arranged on the side of the second flange away from the first end, and the second pressing plate abuts on the side of the second sealing plug away from the first end.

[0010] According to some embodiments of the utility model, the second pressing plate is provided with a second via hole arranged opposite to the second through -hole, and the second via hole is used for the cable to pass through.

[0011] According to some embodiments of the utility model, a first sealing ring is arranged between the first flange and the end wall of the first end; and / or, a second sealing ring is arranged between the second flange and the end wall of the second end.

[0012] According to some embodiments of the utility model, the cable insulation voltage test testing arrangement further includes a stress cone arranged in the bushing assembly and connected with the first flange, and the stress cone is used for sleeving on the cable.

[0013] According to some embodiments of the present application, the first flange or the second flange is provided with an inflation valve, which, when opened, communicates the internal space of the sleeve assembly with the outside.

[0014] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in conjunction with the drawings and embodiments, wherein: Figure 1 is a sectional view of the cable insulation voltage test testing device of an embodiment of the present application; Figure 2 is Figure 1 is an enlarged view of A in the middle; Figure 3 is Figure 1 is an enlarged view of B in the middle.

[0016] REFERENCE NUMERALS 10, cable; 100, sleeve assembly; 200, first sealing assembly; 210, first flange; 211, first through hole; 220, first sealing plug; 230, first pressing plate; 231, first via hole; 240, first sealing ring; 250, first fastener; 260, second fastener; 300, second sealing assembly; 310, second flange; 311, second through hole; 320, second sealing plug; 330, second pressing plate; 331, second via hole; 340, second sealing ring; 350, third fastener; 360, fourth fastener; 400, stress cone; 500, inflation valve; 600, lead-out fitting. DETAILED DESCRIPTION

[0017] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] like Figure 1 As shown, an embodiment of the cable insulation voltage testing device provided by this utility model includes a sleeve assembly 100, a first sealing assembly 200, and a second sealing assembly 300. The sleeve assembly 100 is used for the cable 10 to pass through. The first sealing assembly 200 is used to seal the gap between the first end of the sleeve assembly 100 and the cable 10. The second sealing assembly 300 is used to seal the gap between the second end of the sleeve assembly 100 and the cable 10. The first end and the second end of the sleeve assembly 100 are opposite ends of the sleeve assembly 100.

[0021] Combination Figure 1 and Figure 2 The first sealing assembly 200 is disposed at the first end of the sleeve assembly 100. The first sealing assembly 200 includes a first flange 210, a first sealing plug 220 and a first pressure plate 230. The first flange 210 is connected to the first end of the sleeve assembly 100. The first flange 210 is provided with a first through hole 211 for the cable 10 to pass through. The first through hole 211 communicates with the internal space of the sleeve assembly 100. At least part of the first sealing plug 220 is inserted into the first through hole 211 and is used to abut against the outer side wall of the cable 10. The first pressure plate 230 is connected to the first flange 210 and presses the first sealing plug 220 between the hole wall of the first through hole 211 and the outer side wall of the cable 10.

[0022] The first flange 210 is fixed to the first end of the sleeve assembly 100 and is coaxially arranged with the sleeve assembly 100. The first flange 210 is used to seal a portion of the opening at the first end of the sleeve assembly 100. The first flange 210 is connected to the sleeve assembly 100 by a first fastener 250, which can be a bolt.

[0023] Furthermore, a first sealing ring 240 is provided between the first flange 210 and the end wall of the first end of the sleeve assembly 100. The first sealing ring 240 is used to improve the sealing performance between the first flange 210 and the sleeve assembly 100. Specifically, the first flange 210 has a first annular mounting groove coaxially arranged with the sleeve assembly 100 on the side near the sleeve assembly 100. The first sealing ring 240 is disposed in the first annular mounting groove and abuts against the end wall of the first end of the sleeve assembly 100.

[0024] The first through hole 211 is opened in the middle of the first flange 210 and passes through both sides of the first flange 210. One end of the first through hole 211 is set facing the internal space of the sleeve assembly 100, and the other end of the first through hole 211 is set away from the internal space of the sleeve assembly 100. The cable 10 can be extended into the sleeve assembly 100 through the first through hole 211.

[0025] At least a portion of the structure of the first sealing plug 220 is inserted into the first through hole 211 and abuts against the outer wall of the cable 10 passing through the first through hole 211. The first sealing plug 220 seals the gap between the wall of the first through hole 211 and the outer wall of the cable 10. Specifically, the first sealing plug 220 is sleeved on and abuts against the cable 10 and abuts against the wall of the first through hole 211. The first sealing plug 220 is an elastic member, and its material can be silicone or rubber.

[0026] Furthermore, the diameter of the first through hole 211 gradually decreases along the direction from the first end to the second end of the sleeve assembly 100; the outer diameter of the first sealing plug 220 also gradually decreases along the direction from the first end to the second end of the sleeve assembly 100. In other words, the wall of the first through hole 211 is conical, and the outer wall of the first sealing plug 220 is also conical. When the first sealing plug 220 is inserted between the wall of the first through hole 211 and the outer wall of the cable 10 toward the first end of the sleeve assembly 100, the sealing effect of the first sealing plug 220 is better as the insertion depth of the first sealing plug 220 increases.

[0027] The first pressure plate 230 is used to connect to the first flange 210 and press the first sealing plug 220 between the wall of the first through hole 211 and the outer wall of the cable 10, reducing the risk of the first sealing plug 220 falling off. Specifically, the first pressure plate 230 is disposed on the side of the first flange 210 away from the second end of the sleeve assembly 100, and the first pressure plate 230 abuts against the side of the first sealing plug 220 away from the second end of the sleeve assembly 100. It can be understood that the outer diameter of the end of the first sealing plug 220 away from the second end of the sleeve assembly 100 is larger than the maximum diameter of the first through hole 211. The first pressure plate 230 abuts against the side of the first sealing plug 220 away from the second end of the sleeve assembly 100, which can press the first sealing plug 220 tightly between the wall of the first through hole 211 and the outer wall of the cable 10. More specifically, the first pressure plate 230 is provided with a first through hole 231 opposite to the first through hole 211. The first through hole 231 is used to provide clearance for the cable 10 to pass through. Further, the first pressure plate 230 is detachably connected to the first flange 210, and a portion of the structure of the first sealing plug 220 is exposed on the side of the first through hole 211 away from the second end of the sleeve assembly 100. The first pressure plate 230 is detachably connected to the first flange 210 via a second fastener 260, which can be a bolt. By adjusting the tightness of the bolt, the sealing effect of the first sealing plug 220 can be changed.

[0028] It is understood that in the cable insulation voltage test device of this utility model, the first sealing component 200 can be used to achieve the sealing between the first end of the sleeve component 100 and the cable 10. In particular, the first sealing plug 220 can improve the sealing between the hole wall of the first through hole 211 and the outer wall of the cable 10. At the same time, the first sealing plug 220 can be prevented from falling off by pressing the first pressure plate 230 against it.

[0029] Combination Figure 1 and Figure 3 The second sealing assembly 300 is disposed at the second end of the sleeve assembly 100. The second sealing assembly 300 includes a second flange 310, a second sealing plug 320, and a second pressure plate 330. The second flange 310 is connected to the second end of the sleeve assembly 100 and has a second through hole 311 for the cable 10 to pass through. The second through hole 311 communicates with the internal space of the sleeve assembly 100. At least part of the second sealing plug 320 is inserted into the second through hole 311 and is used to abut against the outer side wall of the cable 10. The second pressure plate 330 is connected to the second flange 310 and presses the second sealing plug 320 between the hole wall of the second through hole 311 and the outer side wall of the cable 10.

[0030] The second flange 310 is fixed to the second end of the sleeve assembly 100 and is coaxially arranged with the sleeve assembly 100. The second flange 310 is used to seal a portion of the opening at the second end of the sleeve assembly 100. The second flange 310 is connected to the sleeve assembly 100 by a third fastener 350, which can be a bolt.

[0031] Furthermore, a second sealing ring 340 is provided between the second flange 310 and the end wall of the second end of the sleeve assembly 100. The second sealing ring 340 is used to improve the sealing performance between the second flange 310 and the sleeve assembly 100. Specifically, the second flange 310 has a second annular mounting groove coaxially arranged with the sleeve assembly 100 on the side near the sleeve assembly 100. The second sealing ring 340 is disposed in the second annular mounting groove and abuts against the end wall of the second end of the sleeve assembly 100.

[0032] The second through hole 311 is opened in the middle of the second flange 310 and passes through both sides of the second flange 310. One end of the second through hole 311 is set facing the internal space of the sleeve assembly 100, and the other end of the second through hole 311 is set away from the internal space of the sleeve assembly 100. The cable 10 can extend out of the sleeve assembly 100 through the second through hole 311.

[0033] At least a portion of the structure of the second sealing plug 320 is inserted into the second through hole 311 and abuts against the outer wall of the cable 10 passing through the second through hole 311. The second sealing plug 320 seals the gap between the wall of the second through hole 311 and the outer wall of the cable 10. Specifically, the second sealing plug 320 is sleeved on and abuts against the cable 10 and abuts against the wall of the second through hole 311. The second sealing plug 320 is an elastic member, and its material can be silicone or rubber.

[0034] Furthermore, the diameter of the second through hole 311 gradually decreases along the direction from the second end to the first end of the sleeve assembly 100; the outer diameter of the second sealing plug 320 also gradually decreases along the direction from the second end to the first end of the sleeve assembly 100. In other words, the wall of the second through hole 311 is conical, and the outer wall of the second sealing plug 320 is also conical. When the second sealing plug 320 is inserted between the wall of the second through hole 311 and the outer wall of the cable 10 toward the second end of the sleeve assembly 100, the sealing effect of the second sealing plug 320 is better as the insertion depth of the second sealing plug 320 increases.

[0035] The second pressure plate 330 is used to connect to the second flange 310 and press the second sealing plug 320 between the wall of the second through hole 311 and the outer wall of the cable 10, reducing the risk of the second sealing plug 320 falling off. Specifically, the second pressure plate 330 is disposed on the side of the second flange 310 away from the first end of the sleeve assembly 100, and the second pressure plate 330 abuts against the side of the second sealing plug 320 away from the first end of the sleeve assembly 100. It can be understood that the outer diameter of the first end of the second sealing plug 320 away from the sleeve assembly 100 is larger than the maximum diameter of the second through hole 311. The second pressure plate 330 abuts against the side of the second sealing plug 320 away from the first end of the sleeve assembly 100, which can press the second sealing plug 320 tightly between the wall of the second through hole 311 and the outer wall of the cable 10. More specifically, the second pressure plate 330 is provided with a second through hole 331 opposite to the second through hole 311. The second through hole 331 is used to provide clearance for the cable 10 to pass through. Further, the second pressure plate 330 is detachably connected to the second flange 310, and a portion of the structure of the second sealing plug 320 is exposed on the side of the second through hole 311 away from the first end of the sleeve assembly 100. The second pressure plate 330 is detachably connected to the second flange 310 via a fourth fastener 360, which can be a bolt. By adjusting the tightness of the bolt, the sealing effect of the second sealing plug 320 can be changed.

[0036] It should be noted that the end of the cable 10 that passes through the sleeve assembly 100 and exits through the second sealing assembly 300 is also connected to the lead-out fitting 600.

[0037] It is understood that in the cable insulation voltage test device of this utility model, the second sealing component 300 can be used to achieve the seal between the second end of the sleeve assembly 100 and the cable 10. In particular, the second sealing plug 320 can improve the sealing performance between the hole wall of the second through hole 311 and the outer wall of the cable 10. At the same time, the second sealing plug 320 can be prevented from falling off by pressing the second pressure plate 330 against it.

[0038] like Figure 2 As shown, in some embodiments, an inflation valve 500 is provided on the first flange 210, which, when opened, connects the internal space of the sleeve assembly 100 with the outside.

[0039] Understandably, the inflation valve 500 has a closed state and an open state. When the inflation valve 500 is closed, outside gas cannot enter the internal space of the bushing assembly 100 through the inflation valve 500, and similarly, gas inside the bushing assembly 100 cannot flow to the outside through the inflation valve 500. When the inflation valve 500 is open, sulfur hexafluoride gas can be injected into the internal space of the bushing assembly 100 through the inflation valve 500 to enhance the insulation protection effect.

[0040] In some other embodiments, the inflation valve 500 is disposed on the second flange 310.

[0041] Combination Figure 1 and Figure 2 In some embodiments, the cable insulation voltage test apparatus further includes a stress cone 400 disposed within the bushing assembly 100 and connected to the first flange 210, the stress cone 400 being fitted over the cable 10.

[0042] During installation of the cable insulation voltage testing device of this utility model: First, the first pressure plate 230, the first sealing plug 220, the first flange 210, and the stress cone 400 are pre-installed onto the cable 10. The stress cone 400 is then fixedly connected to the first flange 210 using bolts. When installing the first sealing plug 220, silicone oil can be applied to the outer wall of the cable 10 to reduce friction. Next, the sleeve assembly 100 is installed onto the cable 10, and the sleeve assembly 100 is fixedly connected to the first flange 210 using the first fastener 250. The two are sealed by the first sealing ring 240. Then, the first pressure plate 230 is fixed to the first flange 210 using the second fastener 260. During the fixing process, the first pressure plate 230 presses the first sealing plug 220 against the first flange 210. The wall of the through hole 211 is sealed. Then, the second flange 310, the second sealing plug 320, and the second pressure plate 330 are fitted onto the cable 10. The second flange 310 and the sleeve assembly 100 are fixed with the third fastener 350. The second flange 310 and the sleeve assembly 100 are sealed with the second sealing ring 340. Then, the second pressure plate 330 is fixed to the second flange 310 with the fourth fastener 360. During the fixing process, the second sealing plug 320 is pressed against the wall of the second through hole 311 of the second flange 310 by the second pressure plate 330 to seal. Finally, the lead-out fitting 600 is pressed onto the conductor of the cable 10 with a crimping tool. After the cable insulation voltage test device is fully assembled, sulfur hexafluoride gas is charged through the one-way gas charging valve 500.

[0043] The cable insulation voltage test device of this utility model continuously applies voltage to the cable 10. When the required test voltage is reached, a long-term withstand voltage test is performed. If the insulation of the cable 10 does not break down after the test, the cable 10 passes the insulation breakdown strength test; if the insulation of the cable 10 breaks down during the test, the insulation breakdown strength of the cable 10 can be determined by recording the voltage value at the time of breakdown.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cable insulation voltage testing device, characterized in that, include: A sleeve assembly having a first end and a second end disposed opposite to the first end; A first sealing assembly is disposed at the first end. The first sealing assembly includes a first flange, a first sealing plug, and a first pressure plate. The first flange is connected to the first end and has a first through hole for a cable to pass through. The first through hole communicates with the internal space of the sleeve assembly. At least a portion of the first sealing plug is inserted into the first through hole and is used to abut against the outer side wall of the cable. The first pressure plate is connected to the first flange and presses the first sealing plug between the hole wall of the first through hole and the outer side wall of the cable. The second sealing assembly is disposed at the second end and includes a second flange, a second sealing plug, and a second pressure plate. The second flange is connected to the second end and has a second through hole for the cable to pass through. The second through hole communicates with the internal space of the sleeve assembly. At least part of the second sealing plug is inserted into the second through hole and is used to abut against the outer wall of the cable. The second pressure plate is connected to the second flange and presses the second sealing plug between the hole wall of the second through hole and the outer wall of the cable.

2. The cable insulation voltage test apparatus according to claim 1, characterized in that, The diameter of the first through hole gradually decreases along the direction from the first end to the second end; the outer diameter of the first sealing plug gradually decreases along the direction from the first end to the second end.

3. The cable insulation voltage test apparatus according to claim 1, characterized in that, The first pressure plate is disposed on the side of the first flange away from the second end, and the first pressure plate abuts against the side of the first sealing plug away from the second end.

4. The cable insulation voltage testing device according to claim 1, characterized in that, The first pressure plate is provided with a first through hole opposite to the first through hole, and the first through hole is used for the cable to pass through.

5. The cable insulation voltage testing device according to claim 1, characterized in that, The diameter of the second through hole gradually decreases along the direction from the second end to the first end; the outer diameter of the second sealing plug gradually decreases along the direction from the second end to the first end.

6. The cable insulation voltage testing device according to claim 1, characterized in that, The second pressure plate is disposed on the side of the second flange away from the first end, and the second pressure plate abuts against the side of the second sealing plug away from the first end.

7. The cable insulation voltage testing device according to claim 1, characterized in that, The second pressure plate is provided with a second through hole opposite to the second through hole, and the second through hole is used for the cable to pass through.

8. The cable insulation voltage testing device according to claim 1, characterized in that, A first sealing ring is provided between the first flange and the end wall of the first end; and / or, a second sealing ring is provided between the second flange and the end wall of the second end.

9. The cable insulation voltage testing device according to claim 1, characterized in that, It also includes a stress cone disposed within the sleeve assembly and connected to the first flange, the stress cone being used to sleeve the cable.

10. The cable insulation voltage testing device according to claim 1, characterized in that, An inflation valve is provided on the first flange or the second flange, and when the inflation valve is opened, it connects the internal space of the sleeve assembly with the outside.

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