Cable terminal and gas insulation totally-enclosed combined electric appliance

Abstract

The utility model discloses a cable terminal and a gas insulation totally-enclosed composite apparatus. The cable terminal comprises a shell, a cable accessory, a contact seat and a conductor, and a hand hole structure is arranged on the side wall of the shell; the cable accessory is located in the shell and comprises a cable head and a conductive piece, and the conductive piece is fixed to the cable head; the contact seat is arranged in the shell and is arranged corresponding to the cable accessory; one end of each conductor is detachably connected with the corresponding conductive piece through a fastener, and the other end of each conductor is detachably connected with the corresponding contact seat through a plug-in structure; wherein the conductor can be detached at the hand hole structure, so that the cable accessory is disconnected from a main loop of the gas insulation totally-enclosed combined electric appliance. According to the cable terminal, the cable can be disconnected from a main loop of equipment only by dismounting the conductor, and the conductor can be mounted after a test is finished, so that the process of dismounting a cable head is omitted, the mounting period of the cable terminal during the test is shortened, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power engineering equipment, in particular to a cable terminal and a gas-insulated fully enclosed combined electrical appliance. Background Art

[0002] The full name of GIS is gas-insulated fully enclosed switchgear. During the operation of the national power system, GIS is one of the important equipment in large substations. It is mainly composed of circuit breakers, current transformers, three-position isolating grounding switches, voltage transformers, cable terminals or bushing inlets and outlets, etc. It has the advantages of high reliability, short installation cycle, strong environmental adaptability, and high safety, so it is widely used. Cable terminal is a more common three-phase common box cable inlet and outlet interface form. The cable head is generally installed according to the standard at the equipment site. After the equipment is installed on site, it is necessary to disconnect the cable head when conducting a withstand voltage test. The relevant technology is to open the bottom cover to disassemble the cable head. This operation method is inconvenient to disassemble, has a long installation cycle, is prone to internal foreign matter contamination, and may even have the possibility of insulation failure. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a cable terminal, so that after the gas-insulated fully enclosed combined electrical appliance using the cable terminal is installed on the project site, when the withstand voltage test is carried out, the cable can be disconnected from the main circuit of the equipment by simply removing the conductor, and the conductor can be installed after the test is completed.

[0004] The utility model also provides a gas-insulated fully enclosed combined electrical appliance adopting the cable terminal.

[0005] According to the cable terminal of the first aspect of the utility model, the cable terminal is used for a gas-insulated fully enclosed combination electrical appliance, and the cable terminal includes a shell, at least two cable accessories, at least two contact holders and a conductor, and the side wall of the shell is provided with a hand hole structure; at least two cable accessories are located in the shell, and the cable accessories include a cable head and a conductive member, and the conductive member is fixed to the cable head; at least two contact holders are arranged in the shell and corresponding to the at least two cable accessories; one end of the conductor is detachably connected to the corresponding conductive member by a fastener, and the other end is detachably connected to the corresponding contact holder by a plug-in structure; wherein the conductor can be removed at the hand hole structure to disconnect the cable accessories from the main circuit of the gas-insulated fully enclosed combination electrical appliance.

[0006] The cable terminal according to the embodiment of the utility model has at least the following beneficial effects: the two ends of the conductor of the cable terminal are detachably connected to the cable accessories and the contact seat respectively, and the conductor can be removed along the hand hole structure provided on the shell. After the gas-insulated fully enclosed combination electrical appliance using the cable terminal is installed at the project site, when a withstand voltage test is carried out, it is only necessary to remove the conductor to disconnect the cable from the main circuit of the equipment, and the conductor can be installed after the test is completed, thereby eliminating the process of removing the cable head, shortening the installation period of the cable terminal during the test, and improving the efficiency. In addition, during the process of removing the conductor, external foreign matter will not enter the shell, thereby not causing pollution inside the cable terminal.

[0007] According to some embodiments of the present invention, the position of the connection end between the conductive member and the conductor corresponds to the position of the hand hole structure on the housing.

[0008] According to some embodiments of the utility model, three cable accessories are provided, three contact seats are provided correspondingly, three hand hole structures are provided, and the three hand hole structures are provided correspondingly to the three cable accessories.

[0009] According to some embodiments of the present invention, the three hand hole structures are evenly spaced along the circumference of the shell.

[0010] According to some embodiments of the utility model, the hand hole structure includes a short tube and a transition flange, the short tube is arranged on the shell, the short tube is connected to the inner cavity of the shell, the transition flange is arranged at one end of the short tube away from the shell, the transition flange is provided with an electrical testing device, and one end of the electrical testing device extends into the short tube.

[0011] According to some embodiments of the utility model, a protective cover is provided on the transition flange, and an end of the electrical testing device facing away from the short tube is arranged in the protective cover.

[0012] According to some embodiments of the utility model, a protective device is provided on the shell, and the protective device is used for explosion-proof and / or moisture-proof.

[0013] According to some embodiments of the present utility model, the shell includes a main body and a bottom plate, the bottom plate is installed on the bottom of the main body, and the cable accessories are fixed to the bottom plate.

[0014] According to some embodiments of the utility model, a pot-type insulator is provided on the shell, and the contact seat is provided on the pot-type insulator.

[0015] The gas-insulated fully enclosed combined electrical appliance according to the second embodiment of the utility model comprises the cable terminal described in any one of the above embodiments.

[0016] The gas-insulated fully enclosed combination electrical apparatus according to the embodiment of the utility model has at least the following beneficial effects: after the gas-insulated fully enclosed combination electrical apparatus is installed at the project site, when a withstand voltage test is carried out, it is only necessary to remove the conductor to disconnect the cable from the main circuit of the equipment, and the conductor can be installed after the test is completed, thereby eliminating the process of removing the cable head, shortening the installation period of the cable terminal during the test, and improving the efficiency. In addition, during the process of removing the conductor, external foreign matter will not enter the shell, thereby not causing pollution inside the cable terminal.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 A cross-sectional view of a cable terminal according to an embodiment of the utility model;

[0020] Figure 2 A three-dimensional schematic diagram of a housing of a cable terminal according to an embodiment of the utility model;

[0021] Figure 3 for Figure 2 A top view of a housing of a cable terminal according to an exemplary embodiment is shown.

[0022] Figure Number:

[0023] The cable terminal 100 , the housing 110 , the main body 111 , the bottom plate 112 , the through hole 113 , the cable accessories 120 , the cable head 121 , the conductive member 122 , the contact seat 130 , the conductor 140 , the inflation valve seat 150 , the pot insulator 160 , and the fastener 170 .

[0024] Hand hole structure 200, short pipe 210, transition flange 220, electrical testing device 230, protective cover 240;

[0025] Protective device 300. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the descriptions involving orientation, such as left, right, etc., the orientation or positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] After the gas-insulated fully enclosed combination electrical appliances are installed at the project site, it is necessary to disconnect the cable accessories from the main circuit of the gas-insulated fully enclosed combination electrical appliances during the withstand voltage test. The relevant technology is to open the bottom cover and remove the cable head to achieve this. This operation method is inconvenient to disassemble, has a long installation cycle, is prone to internal foreign matter contamination, and may even have the possibility of insulation failure.

[0031] The specific structure of the cable terminal 100 of the present invention is described in detail below by taking the three-phase common box type cable inlet and outlet interface as an example.

[0032] Reference Figure 1 The cable terminal 100 proposed in the embodiment of the utility model comprises a housing 110, a three-phase cable accessory 120, three contact seats 130 and a conductor 140. The side wall of the housing 110 is provided with three through holes 113, and the three through holes 113 are provided with a hand hole structure 200. In this embodiment, the hand hole structure 200 comprises a short tube 210 and a transition flange 220. The short tube 210 is provided on the housing 110 at the through hole 113, and the short tube 210 is connected with the inner cavity of the housing 110. The transition flange 220 is provided at one end of the short tube 210 away from the housing 110. The aperture size of the through hole 113 and the short tube 210 can allow an adult's arm to pass through. The housing 110 is provided with an inflation valve seat 150, and the inflation valve seat 150 is provided with an inflation valve, and the inner cavity of the housing 110 can be filled with a protective gas such as sulfur hexafluoride through the inflation valve. The three hand hole structures 200 and the inflation valve seat 150 are evenly arranged along the circumference of the shell 110 , and the three hand hole structures 200 are arranged in a one-to-one correspondence with the three-phase cable accessories 120 .

[0033] The cable accessory 120 is located in the housing 110. The cable accessory 120 includes a cable head 121 and a conductive member 122. The conductive member 122 is fixed to one end of the cable head 121 by bolts, and the other end of the cable head 121 is connected to an external cable. Three contact seats 130 are arranged in the housing 110 and correspond to the cable accessories 120 one by one.

[0034] Each cable accessory 120 is connected to the corresponding contact seat 130 via a conductor 140 , and one end of the conductor 140 is detachably connected to the corresponding conductive member 122 via a fastener 170 , and the other end of the conductor 140 is detachably connected to the corresponding contact seat 130 via a plug-in structure.

[0035] After the gas-insulated fully enclosed combination electrical appliance at the project site is installed, it is necessary to disconnect the cable outlet from the gas-insulated fully enclosed combination electrical appliance when conducting a withstand voltage test. When disconnecting, first remove the transition flange 220 with the hand hole structure 200, and use the short tube 210 and the through hole 113 as the hand hole. The operator can disassemble the A, B, and C phases corresponding to the hand hole structure 200. The operator carries a wrench and extends his arm into the housing 110 to remove the fastener 170 between the conductor 140 and the conductive member 122, and then rotates along the top axis of the conductor 140 and pulls it downward, and then the conductor 140 can be taken out through the through hole 113 and the short tube 210, so as to achieve the purpose of disconnecting the cable accessory 120 from the main circuit of the gas-insulated fully enclosed combination electrical appliance.

[0036] The two ends of the conductor 140 of the cable terminal 100 are detachably connected to the cable accessories 120 and the contact seat 130 respectively, and the conductor 140 can be removed along the hand hole structure 200 set on the shell 110. After the gas-insulated fully enclosed combination electrical appliance using the cable terminal 100 is installed at the project site, when a withstand voltage test is carried out, it is only necessary to remove the conductor 140 to disconnect the cable from the main circuit of the equipment. After the test is completed, the conductor 140 can be installed, thereby eliminating the process of removing the cable head 121, shortening the installation period of the cable terminal 100 during the test, and improving the efficiency. In addition, during the process of removing the conductor 140, external foreign matter will not enter the shell 110, thereby not causing pollution inside the cable terminal 100.

[0037] It is understandable that the fastener 170 may be a bolt or the like, and the cable accessory 120 may also be two-phase, which is not limited herein.

[0038] The plug-in structure can adopt a structure in which a plug connector and a slot cooperate. Specifically, Figure 1As shown, a plug connector is provided at one end of the conductor 140, and a slot is provided at the contact holder 130. The plug connector can be inserted into the slot to achieve electrical connection between the conductor 140 and the contact. In order to facilitate the insertion of one end of the conductor 140 into the slot on the contact holder 130, the plug connector at one end of the conductor 140 is provided with a rounded corner, and the opening periphery of the slot can also be provided with a rounded corner.

[0039] It should be noted that when the cross section of the conductor 140 has a sufficient size, the positions of the plug connector and the slot can be swapped, that is, the slot is set on the end surface of the conductor 140 and the plug connector is set on the contact seat 130.

[0040] Reference Figure 1 In some embodiments, the position of the connection end between the conductive member 122 and the conductor 140 corresponds to the position of the hand hole structure 200 on the housing 110. In other words, the height of the connection end between the conductive member 122 and the conductor 140 is substantially equal to the height of the hand hole structure 200 on the housing 110, thereby facilitating the arm to reach into the hand hole to remove the fastener 170 between the conductor 140 and the conductive member 122.

[0041] Reference Figure 2 , Figure 3 In some embodiments, three cable accessories 120 are arranged along the circumference of the shell 110, three contact seats 130 are correspondingly arranged above the cable accessories 120 along the circumference of the shell 110, three hand hole structures 200 are evenly spaced along the circumference of the shell 110, and each hand hole structure 200 is distributed at 120°, and the three hand hole structures 200 are arranged one by one with the three cable accessories 120, so that the corresponding conductors 140 of each phase can be disassembled through different hand hole structures 200, which is convenient and quick.

[0042] Reference Figure 1 The transition flange 220 is provided with an electric test device 230, one end of which extends into the short tube 210. The electric test device 230 can be used to determine whether the power-off equipment has no voltage, so as to ensure the safety of the personnel installing the grounding wire and prevent the occurrence of serious accidents such as installing the grounding wire under power or closing the grounding disconnector under power. A qualified contact electric tester of corresponding voltage level should be used for electric test. In addition, the three phases A, B, and C can be provided with an electric test device 230 to meet the needs of different customers. When not needed, the transition flange 220 can be sealed by a cover plate. The hand hole structure 200 for installing the electric test device 230 can serve as a hand hole and realize the electric test function, so that the cable terminal 100 has a simple structure and perfect functions.

[0043] It can be understood that the joint surfaces of the transition flange 220 all adopt a double-layer sealing structure, which can reduce the risk of leakage of the protective gas in the shell and reduce the leakage of the greenhouse gas sulfur hexafluoride. The connection is tight and the sealing performance is good, which is beneficial to environmental protection.

[0044] Reference Figure 1 In some embodiments, a protective cover 240 is provided on the transition flange 220, and one end of the electrical testing device 230 away from the short tube 210 is provided in the protective cover 240, so that the protective cover 240 can prevent the electrical testing device 230 from being damaged by a harsh environment.

[0045] Reference Figure 1 In some embodiments, a protective device 300 is provided on the shell 110, and the protective device 300 includes an explosion-proof mechanism and / or a moisture-proof mechanism, thereby having explosion-proof and / or moisture-proof functions, and the explosion-proof mechanism and the moisture-proof mechanism can be used alone or in combination.

[0046] Reference Figure 1 , Figure 2 , Figure 3 In some embodiments, the housing 110 includes a main body 111 and a bottom plate 112 , the bottom plate 112 is installed at the bottom of the main body 111 , and the cable accessory 120 is fixed to the bottom plate 112 .

[0047] Reference Figure 1 In some embodiments, a pot-type insulator 160 is provided on the housing 110, and the contact holder 130 is provided on the pot-type insulator 160. The pot-type insulator 160 is generally made of insulating parts (such as porcelain parts) and metal accessories (such as steel feet, iron caps, flanges, etc.) glued or mechanically clamped with adhesive. Insulators are widely used in power systems, generally belong to external insulation, and work under atmospheric conditions. The external live conductors 140 of overhead transmission lines, busbars of power plants and substations, and various electrical equipment must be supported by insulators and insulated from the earth (or grounding objects) or other conductors 140 with potential differences.

[0048] The gas-insulated fully enclosed switchgear proposed in the embodiment of the utility model includes the cable terminal 100 described in any of the above embodiments. Therefore, after the gas-insulated fully enclosed switchgear is installed at the project site, when a withstand voltage test is carried out, it is only necessary to remove the conductor 140 to disconnect the cable from the main circuit of the equipment, and then install the conductor 140 after the test is completed, thereby eliminating the process of disassembling the cable head 121, shortening the installation period of the cable terminal 100 during the test, and improving efficiency.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A cable terminal for a gas-insulated fully enclosed switchgear, characterized in that: include: The shell body has a hand hole structure on the side wall; At least two cable accessories are located in the housing, the cable accessories include a cable head and a conductive member, and the conductive member is fixed to the cable head; At least two contact seats are arranged in the housing and are corresponding to at least two of the cable accessories; A conductor, one end of which is detachably connected to the corresponding conductive member via a fastener, and the other end of which is detachably connected to the corresponding contact seat via a plug-in structure; The conductor can be disassembled at the hand hole structure to disconnect the cable accessories from the main circuit of the gas-insulated fully enclosed switchgear.

2. The cable terminal according to claim 1, characterized in that The position of the connection end between the conductive member and the conductor corresponds to the position of the hand hole structure on the housing.

3. The cable terminal according to claim 1 or 2, characterized in that: The cable accessories are provided in three numbers, the contact seats are provided in three numbers correspondingly, the hand hole structures are provided in three numbers, and the three hand hole structures are provided in correspondence with the three cable accessories.

4. The cable terminal according to claim 3, characterized in that The three hand hole structures are evenly spaced along the circumference of the shell.

5. The cable terminal according to claim 1, characterized in that The hand hole structure includes a short tube and a transition flange. The short tube is arranged on the shell and is connected to the inner cavity of the shell. The transition flange is arranged at one end of the short tube away from the shell. The transition flange is provided with an electrical testing device, and one end of the electrical testing device extends into the short tube.

6. The cable terminal according to claim 5, characterized in that A protective cover is arranged on the transition flange, and one end of the electrical testing device which is away from the short tube is arranged in the protective cover.

7. The cable terminal according to claim 1, characterized in that The housing is provided with a protection device, which is used for explosion-proof and / or moisture-proof.

8. The cable terminal according to claim 1, characterized in that The housing comprises a main body and a bottom plate, wherein the bottom plate is mounted on the bottom of the main body, and the cable accessories are fixed to the bottom plate.

9. The cable terminal according to claim 1, characterized in that A pot-type insulator is arranged on the shell, and the contact seat is arranged on the pot-type insulator.

10. A gas-insulated fully enclosed switchgear, characterized in that: Comprising the cable terminal according to any one of claims 1 to 9.

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