Multi-core cable withstand voltage test terminal isolation assembly and device

Abstract

The utility model relates to a multi-core cable withstand voltage test terminal isolation assembly and device, and belongs to the technical field of cable local withstand voltage test devices, the multi-core cable withstand voltage test terminal isolation assembly comprises an isolation plate made of a conductive material, the isolation plate is provided with no less than two through holes, and the through holes are communicated with the isolation plate. Only one cable core can pass through the through opening, the corresponding cable core is limited to move into other through openings, and one end of the fastener extends into the through opening and abuts against the cable core together with the inner side wall of the through opening. According to the invention, the possibility of short circuit breakdown caused by mutual contact of a plurality of cable cores in the withstand voltage test process can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of cable local withstand voltage test devices, and in particular to a multi-core cable withstand voltage test terminal isolation component and device. Background Art

[0002] Wires and cables can be used to transmit electrical energy, magnetic energy, and information, and to achieve electromagnetic energy conversion. Currently, they are widely used in communications, industrial manufacturing, transportation, and other fields, and are an indispensable component for connecting transmission lines and electrical equipment. Cable heads serve as the starting point and end point of cables. Usually, high-voltage local withstand voltage tests are required on cables when they leave the factory, when they have been stored for a long time, when they become damp, or when they are corroded by acids and alkalis. The high-voltage local withstand voltage test of cables is a test method for evaluating the insulation status of cables. Its main purpose is to detect whether there are defects in the cable insulation system and to evaluate the cable's withstand voltage capability, so as to promptly detect cable faults, prevent accidents, and improve the reliability and safety of the power system.

[0003] In the existing technology, high-voltage local withstand voltage testing mainly involves stripping off the outer shielding semi-conductive layer at the end of the cable, revealing the cable core, and then immersing it in a dedicated oil cup. During the withstand voltage test, the withstand voltage test on a single cable core is inefficient, so it is necessary to conduct withstand voltage tests on multiple cable cores at the same time. When multiple cable cores are close to each other or in contact with each other during the test, the terminal where the outer shield is stripped is where the electric field strength is most concentrated. Even if the cable core is immersed in the oil cup, a short circuit will occur, causing the cable to be broken down multiple times. The broken cable part needs to be manually sawed and stripped before the withstand voltage test can be carried out again, which greatly reduces the efficiency of the cable withstand voltage test. Utility Model Content

[0004] In order to improve the above problems, the present application provides a multi-core cable withstand voltage test terminal isolation component and device.

[0005] In the first aspect, the present application provides a multi-core cable withstand voltage test terminal isolation assembly and device using the following technical solutions:

[0006] A multi-core cable voltage test terminal isolation assembly includes an isolation plate made of conductive material, with a through-hole formed on the isolation plate. The number of the through-holes is not less than 2, and the through-hole is only for one cable core to pass through and restricts the corresponding cable core from moving into other through-holes. One end of the fastener extends into the through-hole and presses against the cable core together with the inner side wall of the through-hole.

[0007] By adopting the above technical solution, the isolation assembly of the installed cable core needs to be placed in the oil cup before the pressure test. The isolation plate with multiple through-holes can effectively isolate and fix multiple cable cores that are undergoing pressure tests at the same time, thereby reducing the possibility of short circuits caused by the cable cores being too close or touching.

[0008] Preferably, the isolation plate is provided with three through-holes.

[0009] By adopting the above technical solution, it is possible to isolate and fix the distance between the three cable cores, thereby improving the efficiency of the withstand voltage test.

[0010] Preferably, an accommodating space for fasteners to penetrate is provided on the edge of the isolation plate.

[0011] By adopting the above technical solution, the weight of the isolation component can be reduced and the assembly space of the fasteners can be optimized.

[0012] Preferably, the fastener is a fastening bolt, and the fastening bolt is threadedly connected to the isolation plate.

[0013] By adopting the above technical solution, the cable core can be installed and fixed by controlling the screwing in and out of the fastening bolts, which has a simple structure and is easy to install.

[0014] Preferably, the fastener is a clamping rod, one end of which is provided with a protrusion, a accommodating cavity is opened in the isolation plate, and a clamping plate is also installed on the isolation plate. The clamping rod passes through the clamping plate and the accommodating cavity in sequence and extends into the through-opening. An elastic part is provided in the accommodating cavity and is sleeved on the clamping rod. One end of the elastic part is in contact with the clamping plate, and the other end is in contact with the protrusion.

[0015] By adopting the above technical solution, the cable core is placed in when the elastic member is tightened, and the cable core is pressed against after the elastic member is loosened, which facilitates the placement and fixation of the cable core and improves installation efficiency.

[0016] Preferably, the isolation plate is detachably connected to a conductive rod.

[0017] By adopting the above technical solution, multiple cable cores can be combined to form a circuit, and voltage withstand tests can be performed on multiple cables at the same time, thereby improving test efficiency.

[0018] Preferably, the outer edge of the isolation plate is arc-shaped.

[0019] By adopting the above technical solution, when the isolation assembly is placed in the oil cup, the friction between the isolation plate and the inner wall of the oil cup can be reduced, making it easier to install and remove the isolation plate.

[0020] In a second aspect, the present application provides a multi-core cable withstand voltage test terminal isolation device, which adopts the following technical solution:

[0021] A multi-core cable withstand voltage test terminal isolation device includes an oil cup and a multi-core cable withstand voltage test terminal isolation component. The isolation component is installed in the oil cup. A conductive seat is provided at the bottom of the oil cup. The conductive seat has an installation groove at one end close to the isolation component and a conductive joint at the other end. The end of the conductive rod away from the isolation plate is installed in the installation groove.

[0022] By adopting the above technical solution, multiple cable cores can be combined to form a circuit, which is connected to the high-voltage circuit, thereby enabling the function of performing voltage withstand tests on multiple cable cores at the same time.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting up the isolation components, the installation distance between multiple cable cores can be limited and fixed, reducing the possibility of short circuit breakdown caused by the cable cores being too close or touching each other.

[0025] 2. The setting of fasteners facilitates the installation and fixation of cable core and isolation plate, thus improving test efficiency.

[0026] 3. Through the setting of the conductive rod, multiple cable cores can be subjected to voltage withstand tests at the same time, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the isolation component used in Example 1 of the present application.

[0028] Figure 2 It is a schematic diagram of the overall structure of the isolation component used in Example 2 of the present application.

[0029] Figure 3 It is a schematic diagram of the overall structure of the test terminal device in the embodiment of the present application.

[0030] Explanation of the accompanying drawings: 1. Isolation plate; 11. Through-hole; 12. Accommodating space; 13. Accommodating cavity; 2. Fastener; 21. Fastening bolt; 22. Clamping rod; 221. Pulling block; 222. Bump; 3. Clamping plate; 4. Elastic member; 5. Conductive rod; 6. Oil cup; 61. Oil cup fixing cover; 62. Cup body; 63. Oil cup base; 64. Conductive seat; 641. Mounting groove; 642. Conductive connector. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] Example 1:

[0033] The first embodiment of the present application discloses a multi-core cable withstand voltage test terminal isolation assembly, referring to Figure 1 The invention comprises a separator 1 and a fastener 2. The separator 1 is made of a conductive material and has an arc-shaped outer edge. The separator 1 has at least two through-holes 11 for the cable cores to pass through. Each through-hole 11 is only suitable for one cable core to pass through. The through-holes 11 can be fully enclosed or have a notch. When the through-hole 11 has a notch, the width of the notch is smaller than the diameter of the cable core.

[0034] Reference Figure 1 The edge of the isolation plate 1 is provided with an accommodation space 12. The fastener 2 can be passed through the accommodation space 12 into the through-opening 11 and pressed against the cable core together with the inner wall of the through-opening 11. The fastener 2 in the embodiment of the present application is a fastening bolt 21, which is threadedly connected to the isolation plate 1. Before the pressure test begins, the fastening bolt 21 is unscrewed away from the through-opening 11. After the cable core passes through the through-opening 11 of the isolation plate 1, the fastening bolt 21 is screwed back in the opposite direction. The screwed-in end of the fastening bolt 21 presses against the inner wall of the through-opening 11 to secure the cable core.

[0035] Reference Figure 1 A conductive rod 5 is threadedly connected to the center of the isolation plate 1, and multiple cable cores are merged into a conductor through the conductive rod 5. The end of the conductive rod 5 away from the isolation plate 1 is connected to the high-voltage circuit, so that multiple cable cores can undergo voltage withstand tests at the same time.

[0036] In this embodiment, the isolation plate 1 is made of copper, and the number of the through openings 11 is preferably three.

[0037] Example 2:

[0038] Reference Figure 2 , Example 2 of the present application discloses a multi-core cable withstand voltage test terminal isolation assembly, which differs from Example 1 in that: the fastener 2 is a clamping rod 22, one end of which is integrally formed with a protrusion 222, and the other end of the clamping rod 22 is threadedly connected to a lifting block 221. An accommodating cavity 13 is provided in the isolation plate 1, and a clamping plate 3 that seals the opening of the accommodating cavity 13 is threadedly connected to the isolation plate 1. The clamping rod 22 passes through the clamping plate 3 and the accommodating cavity 13 in sequence and extends into the through-port 11. An elastic member 4 is provided in the accommodating cavity 13, and the elastic member 4 is a spring. The spring is sleeved on the clamping rod 22 and is located between the lifting block 221 and the protrusion 222. When the lifting block 221 is removed, the spring can be conveniently sleeved on the clamping rod 22.

[0039] In the initial state, the clamping rod 22 is partially located in the through-hole 11. When installing and fixing the cable core, pull the lifting block 221. At this time, the spring will be abutted and compressed by the protrusion 222. The size of the accommodating cavity 13 can allow the protrusion 222 to be completely retracted inside. The cable core is inserted into the through-hole 11 of the isolation plate 1, and the lifting block 221 is released. The spring rebound can push the clamping rod 22 to reset and press the cable core, thereby fixing the cable core.

[0040] Reference Figure 3 The embodiment of the present application also discloses a multi-core cable withstand voltage test terminal device, which includes an oil cup 6, which includes a cup body 62, an oil cup fixing cover 61, a conductive seat 64, and an oil cup base 63 made of insulating material. One end of the cup body 62 is threadedly connected to the oil cup fixing cover 61, and the other end is threadedly connected to the oil cup base 63. The isolation component of Example 1 or Example 2 is placed in the cup body 62. The conductive seat 64 is embedded in the oil cup base 63, and the two are interference fit. A mounting groove 641 is provided on one side of the conductive seat 64 facing the oil cup fixing cover 61, and a conductive connector 642 is provided on the other side. One end of the conductive rod 5 threadedly connected to the isolation plate 1 is inserted into the mounting groove 641 and tightly fitted to achieve electrical conduction between the isolation component and the conductive seat 64.

[0041] The oil cup retaining cover 61 has the same number of openings as the through-holes 11 of the isolation plate 1. Before the withstand voltage test begins, three cable cores are threaded through the oil cup retaining cover 61 and then through the through-holes 11 of the isolation plate 1. The isolation plate 1 and the cable cores are secured using the fasteners 2 on the isolation plate 1. The oil cup 6 is filled with insulating oil. The isolation assembly securing the cable cores is placed within the oil cup 6. The cable cores are now fully immersed in the insulating oil, and the unstripped outer sheath of the cable is in contact with the oil cup retaining cover 61. The conductive rod 5 is connected to the conductive base 64. After the conductive connector 642 on the conductive base 64 is connected to the high-voltage circuit, the withstand voltage test is performed.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A multi-core cable withstand voltage test terminal isolation assembly, characterized by: The invention comprises an isolation plate (1) made of a conductive material and a fastener (2); the isolation plate (1) is provided with a through-hole (11); the number of the through-holes (11) is not less than two; the through-hole (11) is only for one cable core to pass through and restricts the corresponding cable core from moving into other through-holes (11); one end of the fastener (2) extends into the through-hole (11) and presses against the cable core together with the inner side wall of the through-hole (11).

2. A multi-core cable withstand voltage test terminal isolation assembly according to claim 1, characterized in that: The isolation plate (1) is provided with three through openings (11).

3. A multi-core cable withstand voltage test terminal isolation assembly according to claim 2, characterized in that: An accommodating space (12) for the fastener (2) to penetrate is provided on the edge of the isolation plate (1).

4. A multi-core cable withstand voltage test terminal isolation assembly according to any one of claims 1 to 3, characterized in that: The fastener (2) is a fastening bolt (21), and the fastening bolt (21) is threadedly connected to the isolation plate (1).

5. A multi-core cable withstand voltage test terminal isolation assembly according to any one of claims 1 to 3, characterized in that: The fastener (2) is a clamping rod (22), one end of which is provided with a protrusion (222), an accommodating cavity (13) is provided in the isolation plate (1), and a clamping plate (3) is also installed on the isolation plate (1), the clamping rod (22) passes through the clamping plate (3) and the accommodating cavity (13) in sequence and then extends into the through-opening (11), the accommodating cavity (13) is provided with an elastic member (4) sleeved on the clamping rod (22), one end of the elastic member (4) is in contact with the clamping plate (3), and the other end is in contact with the protrusion (222).

6. The multi-core cable withstand voltage test terminal isolation assembly according to claim 1, characterized in that: The isolation plate (1) is detachably connected to a conductive rod (5).

7. The multi-core cable withstand voltage test terminal isolation assembly according to claim 1, characterized in that: The outer edge of the isolation plate (1) is arc-shaped.

8. A multi-core cable withstand voltage test terminal isolation device, comprising an oil cup (6), characterized in that: It also includes the multi-core cable withstand voltage test terminal isolation component as described in claim 6, the isolation component is installed in the oil cup (6), a conductive seat (64) is provided at the bottom of the oil cup (6), a mounting groove (641) is provided on the side of the conductive seat (64) close to the isolation component, and a conductive connector (642) is provided on the other side, and the end of the conductive rod (5) away from the isolation plate (1) is installed in the mounting groove (641).

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