A high voltage cable termination withstand test insulation connection device

Abstract

The utility model provides a kind of high voltage cable terminal withstand voltage test insulation connecting device, including detachable insulating cover body and insulating cover body, the upper and lower ends of insulating cover body are open, the opening below can make it be sleeved on high voltage cable terminal, insulating cover body can be closed the opening above insulating cover body, high pressure test lead wire is arranged in insulating cover body, the end of high pressure test lead wire is provided with the electrically-conductive clamp for clamping high voltage cable terminal, make high voltage cable terminal and high pressure test lead wire electrically connected. By setting detachable insulating cover body and insulating cover body, the connecting part of high voltage cable terminal and high pressure test lead wire can be completely wrapped in insulation protection structure during test, avoid to cause harm to surrounding equipment and personnel, copper claw in clamp cooperates telescopic ring structure, not only have good conductivity and clamping force, but also can adapt to different size specifications cable terminal, improve the versatility and application range of device.

Description

Technical Field

[0001] This utility model relates to the field of cable testing, and in particular to an insulation connection device for withstand voltage testing of high-voltage cable terminals. Background Technology

[0002] After a certain number of years of operation, high-voltage cables must undergo a withstand voltage test according to the relevant specifications for power cable operation testing. This test aims to verify whether the cable's insulation layer has been damaged during installation and to confirm its ability to withstand the rated voltage and a certain multiple of overvoltage, thereby ensuring the safe and stable operation of the cable system.

[0003] With the continuous upgrading of high-voltage power equipment, existing 10-35kV indoor circuit breaker cabinets are developing towards intelligence and compactness. However, during cable withstand voltage testing, cable terminations need to have sufficient air insulation distance. If the air insulation distance is insufficient, or if the air contains high levels of impurities or water molecules, discharge phenomena may occur to surrounding objects or even people under the test voltage, posing a safety risk of personal injury and equipment damage.

[0004] The common approach is to bind the non-test phase cables with ropes in a confined space before the test to forcibly increase the safe distance between the phase cores. However, this method has significant drawbacks: firstly, operators must perform the binding work in a confined space, which is time-consuming, labor-intensive, and physically demanding; secondly, the binding process can easily cause mechanical damage to the cable sheath, affecting the integrity and service life of the cable itself. Therefore, a high-voltage cable terminal withstand voltage test insulation connection device is proposed to solve the above problems. Utility Model Content

[0005] The main purpose of this utility model is to provide an insulation connection device for withstand voltage testing of high-voltage cable terminals, which solves the problem that existing measures require personnel to tie the phase wires of the cable in a narrow space, which is time-consuming and laborious, and at the same time, it is easy to damage the outer sheath of the cable during the binding process.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a high-voltage cable terminal withstand voltage test insulation connection device, including a detachable insulating cover and an insulating shield. The upper and lower ends of the insulating shield are open. The lower opening allows it to be fitted onto the high-voltage cable terminal. The insulating cover can close the upper opening of the insulating shield. A high-voltage test wire is inserted through the insulating shield. The end of the high-voltage test wire is provided with a conductive clamp for clamping the high-voltage cable terminal, so that the high-voltage cable terminal is electrically connected to the high-voltage test wire.

[0007] The conductive clamp includes a connecting ring fitted onto the end of the high-voltage test lead. The bottom of the connecting ring is provided with multiple copper claws arranged in a ring array. The copper claws have a tapered structure that is wider at the top and narrower at the bottom. A telescopic ring is fitted below the copper claws, and a limiting sleeve fitted outside the telescopic ring is also provided on the outside of the copper claws.

[0008] In a preferred embodiment, the cover includes a top plate and a side ring extending downward around the top plate, the inner diameter of which is adapted to the outer diameter of the insulating cover.

[0009] In the preferred embodiment, the copper claw and the connecting ring are integrally formed, and the bottom of the inner side of the telescopic ring is provided with an insertion guide slope.

[0010] In the preferred embodiment, the copper claw is mounted on the bottom of the connecting ring by means of a hinge.

[0011] In the preferred embodiment, the connecting ring is provided with a retractable copper claw support, which includes a telescopic hole provided on the connecting ring and corresponding to the inner side of the copper claw. A support rod is retractably inserted into the telescopic hole. The support rod can abut against the inner side of the corresponding copper claw. The bottom end of the support rod is provided with an inwardly extending anti-detachment block. The top of the support rod is provided with a top ring. The top of the top ring is provided with an outwardly extending control ring. The outer diameter of the control ring is larger than the outer diameter of the connecting ring.

[0012] In the preferred embodiment, the bottom of the insulating cover is provided with multiple telescopic frames located outside the insulating cover, and the telescopic frames are arranged in a circular array. An inverted L-shaped telescopic groove is formed in the telescopic frame, and a telescopic block that slides with the inverted L-shaped telescopic groove is provided on the outside of the upper part of the insulating cover.

[0013] When the telescopic block slides to the top of the inverted L-shaped telescopic groove, the insulating cover connects with the insulating cap.

[0014] In the preferred embodiment, two elastic abutment parts are provided in the horizontal groove at the top of the inverted L-shaped expansion groove, arranged symmetrically in the upper and lower parts.

[0015] In the preferred embodiment, the elastic contact part includes a telescopic cavity disposed on the inner wall of the inverted L-shaped telescopic groove. Limiting grooves are symmetrically disposed on two opposite inner walls of the telescopic cavity. An abutment head extending to the outside of the telescopic cavity is inserted into the telescopic cavity. A limiting block that slides with the limiting groove is disposed outside the abutment head. A telescopic spring that abuts against the abutment head is also disposed in the telescopic cavity. The end of the abutment head that contacts the telescopic block is tapered.

[0016] In the preferred embodiment, the telescopic ring is a ring-shaped telescopic spring.

[0017] This utility model provides an insulating connection device for withstand voltage testing of high-voltage cable terminals. By setting up a detachable insulating cover and insulating shield, the connection between the high-voltage cable terminal and the high-voltage test conductor can be completely wrapped in the insulating protection structure during the test, significantly improving the electrical safety performance during the test and avoiding damage to surrounding equipment and personnel. At the same time, the detachable structure facilitates the operation of the conductive clamp. In addition, the conductive clamp achieves a reliable electrical connection between the high-voltage cable terminal and the test conductor. The copper claws in the clamp, in conjunction with the telescopic ring structure, not only have good conductivity and clamping force, avoiding partial discharge or test errors caused by poor contact, but also can adapt to cable terminals of different sizes and specifications, improving the versatility and applicability of the device. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a structural diagram showing the connection state between the insulating cover and the insulating shield of this utility model;

[0020] Figure 2 This is a utility model Figure 1 The structure diagram of the separated state;

[0021] Figure 3 This is a utility model Figure 1 A half-section structural diagram;

[0022] Figure 4 This is a structural diagram of the first embodiment of the conductive clamp of this utility model;

[0023] Figure 5 This is a side view of the copper claw structure of this utility model;

[0024] Figure 6 This is a structural diagram of the second embodiment of the conductive clamp of this utility model;

[0025] Figure 7 This is a structural diagram of the copper claw support part of this utility model;

[0026] Figure 8 This is a utility model Figure 6 A half-section structural diagram;

[0027] Figure 9 This is a structural diagram of the connection between the insulating cover and the telescopic frame of this utility model;

[0028] Figure 10 This is a structural diagram of the elastic contact part of this utility model;

[0029] Figure 11 This is a utility model Figure 10 Enlarged view of the A-structure;

[0030] Figure 12 This is a structural diagram of the connection between the conductive clamp and the high-voltage cable terminal of this utility model.

[0031] In the diagram: 1. Insulating cover; 2. Insulating shield; 3. High-voltage test lead; 4. Telescopic frame; 5. Telescopic block; 6. Conductive clamp; 601. Connecting ring; 602. Guide slope; 603. Copper claw; 604. Telescopic ring; 605. Limiting sleeve; 606. Telescopic hole; 607. Support rod; 608. Top ring; 609. Control ring; 610. Anti-detachment block; 7. Elastic contact part; 701. Telescopic cavity; 702. Limiting groove; 703. Telescopic spring; 704. Detailed Implementation

[0032] like Figure 1-12 As shown, a high-voltage cable terminal withstand voltage test insulation connection device includes a detachable insulating cover 1 and an insulating shield 2. The upper and lower ends of the insulating shield 2 are open, and the lower opening allows it to be fitted onto the high-voltage cable terminal. The cover 1 includes a top plate and a side ring extending downward around the top plate. The inner diameter of the side ring is adapted to the outer diameter of the insulating shield 2, so that the insulating cover 1 can close the opening above the insulating shield 2. At the same time, the two can be detachably connected by friction.

[0033] A high-voltage test conductor 3 is installed through the insulating cover 2 and the two are fixed together. The end of the high-voltage test conductor 3 is provided with a conductive clamp 6 for clamping the high-voltage cable terminal, so that the high-voltage cable terminal is electrically connected to the high-voltage test conductor 3. Thus, during the test, the connection between the high-voltage test conductor 3 and the high-voltage cable terminal can be surrounded by the insulating cover 2 and the cover 1, and the insulating cover 2 and the cover 1 play a protective role.

[0034] The conductive clamp 6 includes a connecting ring 601 fitted onto the end of the high-voltage test lead 3 and the two are fixed together. The bottom of the connecting ring 601 is provided with a plurality of copper claws 603 arranged in a ring. In this embodiment, the number of copper claws 603 is preferably eight. The copper claws 603 are tapered structures that are wider at the top and narrower at the bottom. A telescopic ring 604 is fitted below the copper claws 603. A limiting sleeve 605 is also provided on the outside of the copper claws 603 and fitted onto the outside of the telescopic ring 604.

[0035] It should be noted that both the connecting ring 601 and the copper claw 603 are made of copper. In addition, in this embodiment, the telescopic ring 604 is a ring-shaped telescopic spring.

[0036] This design allows the conductive clamp 6 to hold the high-voltage cable terminal, enabling electrical connection between the high-voltage cable terminal and the high-voltage test conductor 3. The insulating cover 1 and insulating shield 2 form an insulating protective structure on its exterior, achieving isolation during testing. During installation, after fitting the cover 1 and insulating shield 2 onto the high-voltage cable terminal, the insulating shield 2 is separated from the cover 1, facilitating the clamping of the conductive clamp 6 onto the high-voltage cable terminal by the operator. Then, the insulating shield 2 is reconnected to the cover 1. The telescopic ring 604 on the outside of the copper claw 603 applies pressure to ensure tight contact between the copper claw 603 and the high-voltage cable terminal. It is also adaptable to high-voltage cable terminals of different shapes and sizes. The conical structure of the copper claw 603 also facilitates inward clamping.

[0037] In the first embodiment of the conductive clamp 6, the copper claw 603 and the connecting ring 601 are integrally formed, and the bottom end of the inner side of the telescopic ring 604 is provided with an insertion guide slope 602. When the telescopic ring 604 applies inward pressure to the copper claw 603, the copper claw 603 forms a clamping action on the high-voltage cable terminal through the deformation below. The insertion guide slope 602 facilitates the insertion of the high-voltage cable terminal into the copper claw 603.

[0038] It should be noted that the telescopic ring 604 is compatible with the deformation range of the copper claw 603.

[0039] In the second embodiment of the conductive clamp 6, the copper claw 603 is mounted on the bottom of the connecting ring 601 by means of hinge. This embodiment enhances the flexibility of the copper claw 603, thereby making it adaptable to high-voltage cable terminals with larger shapes, i.e., size variations.

[0040] In addition, in the second embodiment of the conductive clamp 6, the connecting ring 601 is provided with a retractable copper claw opening part, which is used to keep the copper claw 603 in an open state before the high-voltage cable terminal enters, thereby improving the convenience of installation.

[0041] In the preferred embodiment, the copper claw support part is an integrally formed structure, specifically including a telescopic hole 606 set on the connecting ring 601 and corresponding to the inner side of the copper claw 603. A support rod 607 is telescopically inserted into the telescopic hole 606. The support rod 607 can abut against the inner side of the corresponding copper claw 603. The bottom end of the support rod 607 is provided with an inwardly extending anti-detachment block 610. The top of the support rod 607 is provided with a top ring 608. The top of the top ring 608 is provided with an outwardly extending control ring 609. The outer diameter of the control ring 609 is larger than the outer diameter of the connecting ring 601.

[0042] With this design, the copper claw expansion part can be controlled to extend and retract within the telescopic hole 606 via the control ring 609, thereby adjusting the contact relationship between the support rod 607 and the copper claw 603. Therefore, before the high-voltage cable terminal enters, the copper claw 603 can be opened by the completion of the descent of the support rod 607. After the high-voltage cable terminal enters, it can be raised by the control ring 609, thereby contacting the support of the copper claw 603, so that it can form a clamping shape that is compatible with the high-voltage cable terminal under the action of the telescopic ring 604.

[0043] In the preferred embodiment, the bottom of the insulating cover 1 is provided with a plurality of telescopic frames 4 located outside the insulating cover 2. In this embodiment, there are two telescopic frames 4, and the telescopic frames 4 are arranged in a circular array. An inverted L-shaped telescopic groove is formed in the telescopic frame 4. The inverted L-shaped telescopic groove specifically includes a vertical groove and a horizontal groove connected to the top side of the vertical groove. A telescopic block 5 is provided on the outside of the insulating cover 2 that slides in cooperation with the inverted L-shaped telescopic groove.

[0044] In addition, when the telescopic block 5 slides to the top of the inverted L-shaped telescopic groove, the insulating cover 2 is connected to the insulating cover 1.

[0045] This design allows for the sliding engagement of the telescopic frame 4 and the telescopic block 5 to limit the separation distance between the insulating cover 2 and the insulating cover 1, preventing them from separating freely and causing inconvenience for later installation. In addition, during installation, the telescopic block 5 can be slid into the transverse groove of the inverted L-shaped telescopic groove by rotation, thereby improving the stability of the connection between the insulating cover 2 and the insulating cover 1.

[0046] It should be noted that the length of the telescopic frame 4 should be sufficient to fully expose the conductive clamp 6 so that it can be operated on.

[0047] In the preferred embodiment, two elastic abutment parts 7 are provided in the horizontal groove at the top of the inverted L-shaped expansion groove, which are arranged symmetrically to further improve the stability of the connection between the insulating cover 2 and the insulating cap 1.

[0048] The elastic contact part 7 includes a telescopic cavity 701 disposed on the inner wall of the inverted L-shaped telescopic groove. Limiting grooves 702 are symmetrically disposed on two opposing inner walls of the telescopic cavity 701. An abutment head 704 extending to the outside of the telescopic cavity 701 is inserted into the telescopic cavity 701. A limiting block 705 that slides with the limiting groove 702 is disposed outside the abutment head 704. A telescopic spring 703 that abuts against the abutment head 704 is also disposed in the telescopic cavity 701, so that the abutment head 704 can extend and retract under the action of the telescopic spring 703 and under the restriction of the limiting block 705 and the limiting groove 702.

[0049] In addition, the end of the contact head 704 that contacts the telescopic block 5 is tapered, which makes it easy to apply a certain rotational force so that the telescopic block 5 can be compressed by applying a certain pressure to the contact head 704. This improves the connection stability without affecting the ease of installation.

[0050] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. An insulating connection device for withstand voltage testing of high-voltage cable terminals, characterized in that: It includes a detachable insulating cover (1) and an insulating shield (2). The upper and lower ends of the insulating shield (2) are open. The lower opening allows it to be fitted onto the high-voltage cable terminal. The insulating cover (1) can close the upper opening of the insulating shield (2). A high-voltage test wire (3) is installed through the insulating shield (2). The end of the high-voltage test wire (3) is provided with a conductive clamp (6) for clamping the high-voltage cable terminal, so that the high-voltage cable terminal is electrically connected to the high-voltage test wire (3). The conductive clamp (6) includes a connecting ring (601) fitted onto the end of the high voltage test lead (3). The bottom of the connecting ring (601) is provided with a ring array of multiple copper claws (603). The copper claws (603) are tapered structures that are wider at the top and narrower at the bottom. A telescopic ring (604) is fitted below the copper claws (603). A limiting sleeve (605) fitted onto the outside of the telescopic ring (604) is also provided on the outside of the copper claws (603).

2. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 1, characterized in that: The insulating cover (1) includes a top plate and a side ring extending downward around the top plate, the inner diameter of which is adapted to the outer diameter of the insulating cover (2).

3. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 1, characterized in that: The copper claw (603) and the connecting ring (601) are integrally formed, and the bottom end of the inner side of the telescopic ring (604) is provided with an insertion guide slope (602).

4. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 1, characterized in that: The copper claw (603) is mounted on the bottom of the connecting ring (601) by means of hinge.

5. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 4, characterized in that: The connecting ring (601) is provided with a retractable copper claw support, which includes a telescopic hole (606) provided on the connecting ring (601) and corresponding to the inner side of the copper claw (603). A support rod (607) is retractably inserted into the telescopic hole (606). The support rod (607) can abut against the inner side of the corresponding copper claw (603). The bottom end of the support rod (607) is provided with an inwardly extending anti-detachment block (610). The top of the support rod (607) is provided with a top ring (608). The top of the top ring (608) is provided with an outwardly extending control ring (609). The outer diameter of the control ring (609) is larger than the outer diameter of the connecting ring (601).

6. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 1, characterized in that: The bottom of the insulating cover (1) is provided with multiple telescopic frames (4) located outside the insulating cover (2), and the telescopic frames (4) are arranged in a circular array. An inverted L-shaped telescopic groove is formed in the telescopic frame (4), and a telescopic block (5) that slides with the inverted L-shaped telescopic groove is provided on the outside of the insulating cover (2). When the telescopic block (5) slides to the top of the inverted L-shaped telescopic groove, the insulating cover (2) is connected to the insulating cover (1).

7. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 6, characterized in that: Two elastic abutment parts (7) are provided in the horizontal groove at the top of the inverted L-shaped expansion groove.

8. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 7, characterized in that: The elastic contact part (7) includes a telescopic cavity (701) provided on the inner wall of the inverted L-shaped telescopic groove. Limiting grooves (702) are symmetrically provided on the two inner walls opposite to each other of the telescopic cavity (701). A contact head (704) extending to the outside of the telescopic cavity (701) is inserted into the telescopic cavity (701). A limiting block (705) that slides with the limiting groove (702) is provided outside the contact head (704). A telescopic spring (703) that abuts against the contact head (704) is also provided in the telescopic cavity (701). The end of the contact head (704) that contacts the telescopic block (5) is conical.

9. The high-voltage cable terminal withstand voltage test insulation connection device according to claim 1, characterized in that: The telescopic ring (604) is a ring-shaped telescopic spring.

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