阅读说明：本技术 一种环网柜电缆终端连接保护装置 (Ring main unit cable termination connection protection device ) 是由 林培斌 于 2021-03-03 设计创作，主要内容包括：本发明提供了一种环网柜电缆终端连接保护装置,包括过渡保护装置,所述过渡保护装置包括同轴安装的绝缘主体和导电金具,所述绝缘主体为具有内孔的套筒形状,所述绝缘主体的一端为母头,与环网柜连接,另一端为公头,与电缆终端连接,所述导电金具固定在所述绝缘主体的内孔上,所述导电金具的一端与环网柜螺纹连接并导通,另一端与电缆终端螺纹连接并导通。本发明的有益效果是：避免了电缆终端与环网柜的直接连接,可实现电缆终端安装时的应力缓冲,又可以实现在电缆终端发生故障时,仅烧损过渡保护装置,不损失环网柜套管,可现场快速更换电缆终端和过渡保护装置就可完成维修恢复供电。(The invention provides a ring main unit cable terminal connection protection device which comprises a transition protection device, wherein the transition protection device comprises an insulation main body and a conductive fitting which are coaxially installed, the insulation main body is in a sleeve shape with an inner hole, one end of the insulation main body is a female head and is connected with a ring main unit, the other end of the insulation main body is a male head and is connected with a cable terminal, the conductive fitting is fixed on the inner hole of the insulation main body, one end of the conductive fitting is in threaded connection and conduction with the ring main unit, and the other end of the conductive fitting is in threaded connection and conduction with the cable terminal. The invention has the beneficial effects that: the direct connection of the cable terminal and the ring main unit is avoided, stress buffering during installation of the cable terminal can be realized, the transition protection device can be burnt only when the cable terminal breaks down, a ring main unit sleeve is not lost, and the cable terminal and the transition protection device can be quickly replaced on site to complete maintenance and power restoration.)

1. The utility model provides a looped netowrk cabinet cable termination connection protection device which characterized in that: including transition protection device, transition protection device includes coaxial arrangement's insulating main part and electrically conductive gold utensil, the sleeve shape of insulating main part for having the hole, the one end of insulating main part is female head, is connected with the looped netowrk cabinet, and the other end is public head, is connected with cable terminal, electrically conductive gold utensil is fixed on the hole of insulating main part, the one end and the looped netowrk cabinet threaded connection of electrically conductive gold utensil switch on, and the other end and cable terminal threaded connection switch on.

2. The ring main unit cable termination connection protection device of claim 1, wherein: one end of the conductive hardware fitting is a male head, the other end of the conductive hardware fitting is a female head, the male head of the conductive hardware fitting is provided with an external thread, and the female head of the conductive hardware fitting is provided with an internal thread.

3. The ring main unit cable termination connection protection device of claim 2, wherein: looped netowrk cabinet cable termination connects protection device still includes the looped netowrk cabinet, the looped netowrk cabinet is connected with the bi-pass sleeve pipe, the bi-pass sleeve pipe includes coaxial arrangement's bi-pass sleeve pipe external insulation cover and bi-pass set intraductal conductive hardware fitting, the tip of bi-pass sleeve pipe external insulation cover inserts within the female head of insulating main body, the internal thread of public head of conductive hardware fitting with the external screw thread of bi-pass set intraductal conductive hardware fitting passes through threaded connection fastening.

4. The ring main unit cable termination connection protection device of claim 3, wherein: an axial limiting structure is arranged between the female head of the insulating main body and the outer insulating sleeve of the bi-pass sleeve.

5. The ring main unit cable termination connection protection device of claim 2, wherein: the ring main unit cable terminal connection protection device is cable terminal still, cable terminal includes cable terminal outer insulation cover and double-end screw, the public head of insulating main part inserts within the cable terminal outer insulation cover, the internal thread of the female head of electrically conductive gold utensil with the external screw thread of double-end screw passes through threaded connection fastening.

6. The ring main unit cable termination connection protection device of claim 5, wherein: an axial limiting structure is arranged between the male head of the insulation main body and the outer insulation sleeve of the cable terminal.

7. The ring main unit cable termination connection protection device of claim 5, wherein: and one end of the cable terminal, which is far away from the transition protection device, is connected with a cable terminal plug.

8. The ring main unit cable termination connection protection device of claim 2, wherein: the conductive hardware fitting is provided with a fixing ring, the fixing ring is completely embedded into the female head of the insulating main body, and the fixing ring is located at one end of the male head of the conductive hardware fitting.

9. The ring main unit cable termination connection protection device of claim 1, wherein: and the conductive hardware fitting is compositely bonded with the insulating main body.

10. The ring main unit cable termination connection protection device of claim 1, wherein: the insulating main body is a rubber elastic sleeve.

Technical Field

The invention relates to a ring main unit, in particular to a cable terminal connection protection device of the ring main unit.

Background

The existing connection mode of the ring main unit and the cable terminal is that a front plug of the cable terminal (a plug-in separable connector) is directly sleeved into an incoming and outgoing line epoxy sleeve of the ring main unit, and a cable crimping terminal is fastened on a middle conductor of the epoxy sleeve through a bolt, so that the cable is in conductive connection with the ring main unit.

The existing connection mode has the following two defects:

1. after the cable terminal is sleeved into the ring main unit epoxy sleeve, the cable crimping terminal is directly fastened on the epoxy sleeve, and a large amount of stress can be formed in the cable laying and fixing process, so that the distortion stress of a large-size cable is very large. The direct attachment of the cable to the epoxy sleeve can place a significant amount of stress on the sleeve, causing epoxy cracking. Meanwhile, the terminal with large stress cannot be locked, so that poor contact between the terminal and the middle conductor of the bushing is caused, and heat is generated. Finally, breakdown short circuit fault occurs, and the ring main unit is burnt.

2. Because cable termination and looped netowrk cabinet epoxy sleeve pipe lug connection, when installing cable termination trouble that factors such as bad interface flashover punctures or conductor contact generates heat, can burn the epoxy sleeve pipe of looped netowrk cabinet. And the epoxy sleeve is connected with the ring main unit inflation air box, and the assembly position is sealed in the air box and can not be dismantled and replaced on the outdoor site. The problems of difficult maintenance of the ring main unit fault, long maintenance and replacement time and large power failure time loss are caused.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a cable terminal connection protection device of a ring main unit.

The invention provides a ring main unit cable terminal connection protection device which comprises a transition protection device, wherein the transition protection device comprises an insulation main body and a conductive fitting which are coaxially installed, the insulation main body is in a sleeve shape with an inner hole, one end of the insulation main body is a female head and is connected with a ring main unit, the other end of the insulation main body is a male head and is connected with a cable terminal, the conductive fitting is fixed on the inner hole of the insulation main body, one end of the conductive fitting is in threaded connection and conduction with the ring main unit, and the other end of the conductive fitting is in threaded connection and conduction with the cable terminal.

As a further improvement of the present invention, one end of the conductive hardware fitting is a male end, the other end of the conductive hardware fitting is a female end, the male end of the conductive hardware fitting is provided with an external thread, and the female end of the conductive hardware fitting is provided with an internal thread.

As a further improvement of the invention, the ring main unit cable terminal connection protection device further comprises a ring main unit, the ring main unit is connected with a two-way sleeve, the two-way sleeve comprises a two-way sleeve external insulation sleeve and a two-way sleeve internal conductive fitting which are coaxially mounted, the end part of the two-way sleeve external insulation sleeve is inserted into the female head of the insulation main body, and the internal thread of the male head of the conductive fitting is connected and fastened with the external thread of the two-way sleeve internal conductive fitting through threads.

As a further improvement of the invention, an axial limiting structure is arranged between the female head of the insulating main body and the double-pass sleeve outer insulating sleeve.

As a further improvement of the invention, the ring main unit cable terminal connection protection device further comprises a cable terminal, the cable terminal comprises a cable terminal outer insulation sleeve and a double-threaded screw, a male end of the insulation main body is inserted into the cable terminal outer insulation sleeve, and an internal thread of a female end of the conductive hardware fitting is connected and fastened with an external thread of the double-threaded screw through threads.

As a further improvement of the invention, an axial limiting structure is arranged between the male head of the insulation main body and the outer insulation sleeve of the cable terminal.

As a further improvement of the present invention, one end of the cable terminal far away from the transition protection device is connected with a cable terminal plug.

As a further improvement of the present invention, a fixing ring is disposed on the conductive hardware, the fixing ring is completely embedded in the female head of the insulating main body, and the fixing ring is located at one end of the male head of the conductive hardware.

As a further improvement of the invention, the conductive hardware is compositely bonded with the insulating main body.

As a further improvement of the present invention, the insulating body is a rubber elastic sleeve.

The invention has the beneficial effects that: through the scheme, the cable terminal is prevented from being directly connected with the ring main unit, stress buffering during installation of the cable terminal can be realized, only the transition protection device is burnt when the cable terminal breaks down, the ring main unit sleeve is not lost, and the cable terminal and the transition protection device can be quickly replaced on site to complete maintenance and power restoration.

Drawings

Fig. 1 is a schematic diagram of a transition protection device of a ring main unit cable terminal connection protection device according to the present invention.

Fig. 2 is a connection schematic diagram of the ring main unit cable terminal connection protection device of the present invention.

Fig. 3 is a schematic connection diagram of a transition protection device of a ring main unit cable terminal connection protection device and a ring main unit according to the present invention.

Fig. 4 is a schematic connection diagram of a transition protection device and a cable terminal of the ring main unit cable terminal connection protection device according to the present invention.

Detailed Description

The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.

As shown in fig. 1 to 4, a looped netowrk cabinet cable termination connects protection device, including transition protection device 1, transition protection device 1 includes coaxial arrangement's insulating main part 11 and electrically conductive gold utensil 12, insulating main part 11 is the sleeve shape that has the hole, the one end of insulating main part 11 is female head 111, is connected with looped netowrk cabinet 2, and the other end is public head 112, is connected with cable termination 3, electrically conductive gold utensil 12 is fixed on the hole of insulating main part 11, the one end of electrically conductive gold utensil 12 and looped netowrk cabinet 2 threaded connection and switch on, the other end and cable termination 3 threaded connection and switch on.

One end of the conductive hardware fitting 12 is a male head 121, the other end of the conductive hardware fitting is a female head 122, the male head 121 of the conductive hardware fitting 12 is provided with an external thread, and the female head 122 of the conductive hardware fitting 12 is provided with an internal thread.

Looped netowrk cabinet cable termination connects protection device still includes looped netowrk cabinet 2, looped netowrk cabinet 2 is connected with bi-pass sleeve pipe 21, bi-pass sleeve pipe 21 includes coaxial arrangement's bi-pass sleeve pipe external insulation cover 211 and bi-pass set intraductal conductive fittings 212, the tip of bi-pass sleeve pipe external insulation cover 211 inserts within insulating main body 11's female head 111, conductive fittings 12's public head 121 the internal thread with the external screw thread of bi-pass set intraductal conductive fittings 212 passes through threaded connection fastening.

Female 111 of insulating main part 11 with be equipped with axial limit structure between the bi-pass sleeve pipe outer insulation cover 211, this axial limit structure adopts stopper and spacing groove to cooperate.

Looped netowrk cabinet cable termination connects protection device and cable termination 3 still, cable termination 3 includes cable termination outer insulating cover 31 and double threaded screw 32, insert public head 112 of insulating main part 11 within the cable termination outer insulating cover 31, the internal thread of female head 122 of electrically conductive gold utensil 12 with the external screw thread of double threaded screw 32 passes through threaded connection fastening.

An axial limiting structure is arranged between the male head 112 of the insulating main body 11 and the cable terminal outer insulating sleeve 31, and the axial limiting structure adopts a limiting block matched with a limiting groove.

And one end of the cable terminal 3, which is far away from the transition protection device 1, is connected with a cable terminal plug 4.

The conductive hardware 12 is provided with a fixing ring 123, the fixing ring 123 is completely embedded in the female head 111 of the insulating main body 11, and the fixing ring 123 is located at one end of the male head 121 of the conductive hardware 12.

The conductive hardware 12 and the insulating main body 11 are combined and bonded into a whole in a mold.

The insulation main body 11 is a rubber elastic sleeve and is formed by rubber through compression molding.

The conductive hardware 12 is machined and molded by using a conductive metal machine.

The invention provides a ring main unit cable terminal connection protection device, which comprises the following installation processes:

firstly, the female head 111 direction of the insulation main body 11 of the transition protection device 1 is sleeved into a two-way sleeve 21 of a ring main unit 2 (note: the two-way sleeve 21 and the ring main unit 2 are installed in a factory, and a cable terminal 3 is to be installed in a use site), the transition protection device 1 is rotated, the thread of a conductive hardware 12 is screwed into the screw hole of the two-way sleeve 21, and the installation is fastened, so that the hardware conduction is realized; then, the cable terminal 3 with the installed cable is sleeved on the male head 112 of the insulation main body 11 of the transition protection device 1, the double-threaded screw 32 matched with the cable terminal 3 is rotated, the double-threaded screw 32 is connected and fastened with the conductive hardware fitting 12, and finally, the cable terminal plug 4 is installed, so that installation is completed.

The ring main unit cable terminal connection protection device provided by the invention has the following advantages:

(1) the invention innovatively adopts the design of the rubber elastic sleeve, is universal, reduces the processing and has low manufacturing cost. The original cable terminal is directly connected with the epoxy sleeve, and is optimized to be excessively connected through the elastic rubber sleeve, so that the interface pressing force is balanced, and the stress is relieved. Meanwhile, the cable terminal is effectively connected with the end face of the sleeve through a transition connecting rod of a large-flow interface. When the cable stress is larger, the excessive connecting rod releases the stress through the deformation in the length direction, and the stress is prevented from directly acting on the brittle epoxy sleeve.

(2) The invention innovatively adopts a field-detachable structure, when the cable terminal is damaged and burnt due to failure, the cable terminal can be rapidly detached and replaced on the field without replacing an epoxy sleeve, and the long-time power failure loss of replacing the ring main unit is reduced.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.