High-altitude power cable alternating current withstand voltage test device

Abstract

The utility model discloses a high altitude power cable AC withstand voltage test device, comprising a fixing frame and a discharge rod, the fixing frame is provided with three groups of support type insulators corresponding to each other front and back, the top ends of the three groups of support type insulators are all fixedly provided with cable buckles, the lower ends of the support type insulators are provided with telescopic support rods, and the lower ends of the support type insulators are provided with the discharge rod. The discharging rod is connected to the fixing frame, and the fixing frame is provided with a total grounding end. The device is compact in structure and convenient to use, simplifies a tedious wiring mode, improves the efficiency of a cable AC voltage withstand test, can effectively cope with a high-altitude complex and severe test environment, and guarantees the safety of the test device.

Description

TECHNICAL FIELD

[0001] The utility model relates to test transformer technical field, concretely relates to a high altitude power cable ac withstand voltage test device. BACKGROUND

[0002] At present, the electric power industry develops rapidly, and the safety and reliability of power cable, as an important carrier of power transmission, are crucial for the stable operation of the power system. Especially in high-altitude areas, due to the particularity of environmental conditions, the insulation performance and voltage withstand capability of power cables face more severe challenges. As the most effective and direct method to identify the insulation strength of electrical equipment, cable ac withstand voltage test is an important means to ensure the safe operation of power equipment. However, in the existing technology, most of the withstand voltage test devices are designed for cables in normal environment, and the special environmental conditions in high-altitude areas are not considered, resulting in insufficient accuracy of test results, poor equipment adaptability, and potential safety hazards. In addition, the existing cable ac withstand voltage test device also has the problems of complicated wiring mode and complex operation steps, resulting in low test efficiency and inaccurate test results. SUMMARY

[0003] In view of the deficiencies in the prior art, the utility model provides a high-altitude power cable ac withstand voltage test device, which has the advantages of convenient use, improved cable ac withstand voltage test efficiency, and effective response to complex and harsh test environments at high altitudes, ensuring the safety of the test device.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A high-altitude power cable ac withstand voltage test device, comprising a fixing frame and a discharge rod, three groups of support type insulators corresponding in front and back are arranged on the fixing frame, cable buckles are fixedly arranged at the top ends of the three groups of support type insulators, telescopic supporting rods are arranged at the lower ends of the support type insulators, the discharge rod is connected to the fixing frame, and a general grounding end is arranged on the fixing frame.

[0006] By adopting the above technical scheme, three groups of support type insulators corresponding in front and back are arranged, buckles are arranged at the top ends, the installation process is simple and fast, and the test efficiency can be effectively improved; the front and back buckles can effectively fix the power cable body and avoid external interference; six independent telescopic supporting rods can effectively respond to complex and harsh test environments at high altitudes, and the length of the supporting rod can be adjusted to respond to the uneven test environment, thereby effectively ensuring the safety of the test.

[0007] Further, the ground blade holder nesting member is installed below the front end support insulator cable buckle, the ground blade holder controller is arranged on the side away from the rear end of the front end support insulator, and the cable outer sheath ground post is arranged on the side close to the front end of the rear end support insulator.

[0008] Further, the ground blade holder controller is composed of a base, a controllable secondary circuit electromagnet, a ground blade holder and a reset member, the controllable secondary circuit electromagnet includes a static contact and a moving contact, the static contact is fixedly connected to the base, the ground blade holder is movably connected to the base, the moving contact is connected to one side of the ground blade holder and matched with the static contact, and the reset member is connected to the ground blade holder at one end and fixedly connected to the base at the other end.

[0009] Further, the three groups of controllable secondary circuit electromagnets control the opening and closing of the A, B and C three-phase ground blade holders through the remote end, the three groups of ground blade holder nesting members are matched with the A, B and C three-phase ground blade holders, and the reset member drives the closed ground blade holder to reset through the remote end.

[0010] By using the above technical scheme, the opening and closing of the ground blade holder are controlled by three independent controllable secondary circuit electromagnets, and the discharge before and after the test is performed. When one phase of the power cable is tested, the other two phases can be individually grounded by independent ground blade holders, and the remote control form avoids the risk of personnel testing and improves the cumbersome wiring mode during the test. After the completion of the single-phase power cable AC withstand voltage test, the ground blade holder is directly controlled by the remote end to discharge, which facilitates subsequent test work. The three groups of ground blade holder nesting members are matched with the A, B and C three-phase ground blade holders, respectively, to ensure that the ground blade holder can be accurately opened and closed.

[0011] Further, the cable outer sheath ground post adopts a double-layer screw design.

[0012] By using the above technical scheme, three independent power cable outer sheath ground posts are arranged to ensure that the cable outer sheath can be reliably grounded to disperse current, prevent electric shock and lightning impact, etc.; the double-layer screw design can increase the connection strength between the ground post and the cable outer sheath, and through the fastening of the two layers of screws, the connection loosening or falling caused by vibration, temperature change or external force can be more effectively prevented, the stability and reliability of the grounding connection are ensured, and at the same time, the interference of external factors in harsh environments can be avoided, the connection loosening or falling caused by corrosion can be more effectively prevented, and thus the service life of the ground post is prolonged and the test efficiency is improved.

[0013] Further, the cable buckle includes a support block and a clamping groove, the support block is provided with an adjusting tooth, and the clamping groove is matched with the adjusting tooth.

[0014] The technical scheme has the beneficial effects that: the design of the adjusting tooth enables the clamping groove to slide and be positioned along the tooth groove on the supporting block, and fine adjustment is made according to the diameter of the cable or the position to be fixed, so that flexible fixing of the cable is realized, and the matching clamping of the adjusting tooth and the clamping groove makes the installation and dismounting process simpler and faster.

[0015] Further, the telescopic supporting rod is combined by an outer supporting shaft and an inner supporting shaft, the outer supporting shaft is provided with a limiting structure, and the inner supporting shaft is provided with a locking structure, and the limiting structure and the locking structure cooperate to realize positioning between the outer supporting shaft and the inner supporting shaft.

[0016] The technical scheme has the beneficial effects that: the limiting structure and the locking structure cooperate to realize accurate positioning and stable support between the outer supporting shaft and the inner supporting shaft.

[0017] Further, the discharge rod is composed of a discharge assembly, a discharge main body and a handle, one end of the discharge main body is connected with the handle, the other end is connected with the discharge assembly, and the other end of the discharge assembly is connected with a discharge electrode.

[0018] The technical scheme has the beneficial effects that: the discharge rod has a reasonable structure and is used for discharging the cable outer sheath grounding column head and the supporting type insulator located at the rear end. This design enables the discharge rod to stably work in a high-altitude complex and harsh test environment, ensures the reliability and consistency of the discharge effect, and helps to protect the cable outer sheath and the supporting type insulator from damage during the discharging process.

[0019] In summary, the utility model has the following beneficial effects:

[0020] (1) The utility model has the advantages of compact structure, convenient use and convenient control. Three groups of front and rear corresponding supporting type insulators are arranged, the top end is designed with a buckle, the installation process is simple and fast, and the test efficiency can be effectively improved; the front and rear corresponding buckle design can effectively fix the power cable body and avoid external interference; six independent telescopic supporting rods can effectively cope with a high-altitude complex and harsh test environment, and when facing a concave-convex test environment, the length of the supporting rod is adjusted to cope with it, which effectively ensures the safety of the test.

[0021] (2) The opening and closing of the grounding knife switch are controlled by three independent controllable secondary circuit electromagnets, and the discharge before and after the test is performed. When one phase of the power cable is tested, the other two phases can be individually grounded by independent grounding knife switches, in the form of remote control to avoid personnel test risks, and the cumbersome wiring mode during the test is improved.

[0022] (3) The three independent cable outer sheath grounding pile heads ensure that the cable outer sheath can be reliably grounded, the double-layer screw design enhances the stability and reliability of the grounding connection, and meanwhile, the interference of external factors in a harsh environment can be avoided, so that the service life of the grounding pile head is prolonged and the test efficiency is effectively improved.

[0023] (4) The discharge rod structure is rationally designed, so that the discharge rod can stably work in a high-altitude complex harsh test environment, the reliability and consistency of the discharge effect are ensured, and meanwhile, the cable outer sheath and the support type insulator are protected from damage in the discharge process. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the overall structure schematic view of the utility model;

[0025] Figure 2 is the structure schematic view of the cable outer sheath grounding column head of the utility model;

[0026] Figure 3 is the cross section schematic view of the cable buckle of the utility model;

[0027] Figure 4 is the cross section schematic view of the telescopic support rod of the utility model;

[0028] Figure 5 is the remote control system schematic view of the three-phase grounding knife switch opening and closing of the utility model embodiment.

[0029] BRIEF DESCRIPTION OF DRAWINGS 1, fixed frame; 11, support type insulator; 12, cable buckle; 121, support block; 1211, adjusting tooth; 122, clamping groove; 13, telescopic support rod; 131, outer support shaft; 1311, limiting structure; 132, inner support shaft; 1321, locking structure; 14, general grounding end; 15, grounding knife switch nesting component; 16, knife switch controller; 161, base; 162, controllable secondary circuit electromagnet; 1621, static contact; 1622, movable contact; 163, A-phase grounding knife switch; 164, B-phase grounding knife switch; 165, C-phase grounding knife switch; 166, reset component; 17, cable outer sheath grounding column head; 171, double-layer screw; 2, discharge rod; 211, discharge assembly; 212, discharge main body; 213, handle; 214, discharge electrode; 3, remote control unit. DETAILED DESCRIPTION

[0030] The embodiments of the utility model are further explained below in combination with the drawings, but the protection scope is not limited by this.

[0031] In the description of the embodiments of the present application, the technical terms "upper", "lower", "front", "back", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0032] Referring to Figures 1-4 The high-altitude power cable AC withstand voltage test device in the embodiment is used for 33kV and 66kV power cable AC withstand voltage test. The device comprises a fixing frame 1 and a discharge rod 2. The fixing frame 1 is 180cm long and 120cm wide, and is made of epoxy resin insulating material. The use of the material can effectively avoid the risk of electric shock and damage to the test product, and avoid the test personnel from being injured by residual charge when the test product is disassembled. The fixing frame 1 is provided with three groups of support type insulators 11 corresponding in front and back. The support type insulator 11 is 70cm long, and a cable buckle 12 is fixedly arranged at the top end. The cable buckle 12 comprises a support block 121 and a clamping groove 122. The support block 121 is 2cm long, and is provided with an adjusting tooth 1211. The clamping groove 122 is matched and clamped with the adjusting tooth 1211. The lower end of the support type insulator 11 is provided with a telescopic supporting rod 13. The six independent telescopic supporting rods 13 are all 60cm high, and are combined by an outer supporting shaft 131 and an inner supporting shaft 132. The outer supporting shaft 131 is provided with a limiting structure 1311, and the inner supporting shaft 132 is provided with a locking structure 1321. The limiting structure 1311 and the locking structure 1321 are matched to realize the positioning between the outer supporting shaft 131 and the inner supporting shaft 132. When facing the complex test environment of high-altitude unevenness, the length of the supporting rod is adjusted to cope with it, which effectively ensures the safety of the test.

[0033] The grounding knife switch nesting member 15 is installed below the cable buckle 12 of the support type insulator 11 at the front end, and the grounding knife switch controller 16 is arranged on the side away from the rear end of the support type insulator 11 at the front end. The grounding knife switch controller 16 is composed of a base 161, a controllable secondary circuit electromagnet 162, a grounding knife switch and a reset member 166. The controllable secondary circuit electromagnet 162 includes two parts of a static contact 1621 and a movable contact 1622. The static contact 1621 is fixedly connected to the base 161, the grounding knife switch is movably connected to the base 161, the movable contact 1622 is connected to the side of the grounding knife switch and matches the static contact 1621, the reset member 166 is connected to the grounding knife switch at one end and is opposite to the movable contact 1622 at the other end, and the other end is fixedly connected to the base 161. The three pairs of controllable secondary circuit electromagnets 162 control the opening and closing of the A, B and C three-phase grounding knife switches through the remote ends respectively. The opening and closing instructions are sent to the controllable secondary circuit electromagnet 162 through the remote control unit 3. The controllable secondary circuit electromagnet 162 generates a magnetic force after receiving the instructions, the movable contact 1622 and the static contact 1621 are in contact, the closing of the grounding knife switch is driven, the discharge before and after the test is performed, and when the single-phase power cable is tested, the other two phases can be separately grounded by the independent grounding knife switch. The remote control form avoids the risk of personnel testing and improves the complicated wiring mode during the test. After the completion of the single-phase power cable AC withstand voltage test, the grounding knife switch is directly remotely controlled to discharge and perform subsequent test work. The three groups of grounding knife switch nesting members 15 are matched with the A, B and C three-phase grounding knife switches respectively to ensure that the grounding knife switch stably and accurately opens and closes after the controllable secondary circuit electromagnet 162 receives the instructions. The reset member 166 drives the closed grounding knife switch to separate and reset through the remote end.

[0034] The cable outer sheath grounding column head 17 is arranged on the side close to the front end of the support type insulator 11 at the rear end. The cable outer sheath grounding column head 17 is designed with double-layer screws 171 to ensure safe and reliable grounding, avoid interference from external factors in harsh environments, prolong the service life of the grounding column head, and effectively improve the test efficiency.

[0035] The discharge rod 2 is composed of a discharge assembly 211, a discharge body 212 and a handle 213, one end of the discharge body 212 is connected with the handle 213, the other end is connected with the discharge assembly 211, the other end of the discharge assembly 211 is connected with a discharge electrode 214, the discharge rod 2 discharges the cable outer sheath grounding column head 17 and the support type insulator 11 at the rear end, the discharge rod 2 is connected with the fixing frame 1, the fixing frame 1 is provided with a total grounding end 14, through the total grounding end 14, the electric charge on the discharge rod 2 can be safely released to the ground, so as to avoid the electric shock risk caused by the electric charge accumulation, and protect the personal safety and equipment safety. The discharge rod 2 can stably work in the high-altitude complex and harsh test environment, ensure the reliability and consistency of the discharge effect, and help to protect the cable outer sheath and the support type insulator 11 from being damaged in the discharge process.

[0036] The specific embodiment is only an explanation of the application, and is not a limitation of the application, and those skilled in the art can make modifications to the embodiment without creative contribution according to the needs after reading the specification, as long as the modifications are within the scope of the claims of the application and are protected by the patent law.

Claims

1. A high-altitude power cable AC voltage withstand test device, characterized by: The utility model relates to a fixed frame (1) and discharge rod (2) are included, the fixed frame (1) is provided with three groups of support type insulator (11) corresponding to front and back ends, the support type insulator (11) top end fixedly arranged cable buckle (12), the support type insulator (11) lower end is connected with telescopic support rod (13), the discharge rod (2) is connected in the fixed frame (1), the fixed frame (1) is provided with total ground terminal (14).

2. The high-altitude power cable AC withstand test device of claim 1, wherein: The cable buckle (12) below the support type insulator (11) of three groups of the support type insulator (11) located in the front end is provided with ground knife switch nest component (15), the ground knife switch nest component (15) is provided with ground knife switch controller (16) on one side, and the support type insulator (11) located in the rear end of three groups of the support type insulator (11) is provided with cable outer sheath ground post head (17) on the side close to the front end.

3. A high-altitude power cable AC voltage withstand test device according to claim 2, characterized in that: The ground knife switch controller (16) is composed of base (161), controllable secondary circuit electromagnet (162), ground knife switch and reset component (166), the controllable secondary circuit electromagnet (162) includes two parts of static contact (1621) and movable contact (1622), the static contact (1621) is fixedly connected on the base (161), the ground knife switch is movably connected with the base (161), the movable contact (1622) is connected on the side of the ground knife switch and is matched with the static contact (1621), one end of the reset component (166) is connected on the ground knife switch, and the other side is opposite to the movable contact (1622), and the other end is fixedly connected with the base (161).

4. The high-altitude power cable AC withstand test device of claim 3, wherein: The three groups of controllable secondary circuit electromagnet (162) are controlled by remote respectively A, B, C three-phase ground knife switch opening and closing, the three groups of ground knife switch nest component (15) are matched with A, B, C three-phase ground knife switch respectively, the reset component (166) is driven by remote and separates reset for the closed ground knife switch.

5. The high-altitude power cable AC withstand test device of claim 2, wherein: The cable outer sheath ground post head (17) adopts double-layer screw (171) design.

6. The high-altitude power cable AC withstand test device of claim 1, wherein: The cable buckle (12) includes support block (121) and clamping groove (122), the support block (121) is provided with adjusting tooth (1211), and the clamping groove (122) is matched with the adjusting tooth (1211) and is clamped.

7. The high-altitude power cable AC withstand test device of claim 1, wherein: The telescopic support rod (13) is inserted and combined by outer support shaft (131) and inner support shaft (132), the outer support shaft (131) is provided with limiting structure (1311), the inner support shaft (132) is provided with locking structure (1321), and the limiting structure (1311) and the locking structure (1321) are matched to realize the positioning between the outer support shaft (131) and the inner support shaft (132).

8. The high-altitude power cable AC withstand test device of claim 1, wherein: The discharge rod (2) is composed of discharge assembly (211), discharge main body (212) and handle (213), one end of the discharge main body (212) is connected with the handle (213), the other end is connected with the discharge assembly (211), and the other end of the discharge assembly (211) is connected with discharge electrode (214).

9. The high-altitude power cable AC withstand test device of claim 1, wherein: The discharge rod (2) discharges the cable outer sheath grounding post (17) and the support type insulator (11) at the rear end.

10. The high-altitude power cable AC withstand test device of claim 1, wherein: The fixing frame (1) is made of epoxy resin insulating material.

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