WO2020155946A1

WO2020155946A1 - Switchgear trolley provided with lightning arrester and switchgear using same

Info

Publication number: WO2020155946A1
Application number: PCT/CN2019/128087
Authority: WO
Inventors: 李军浩; 任建超; 宋曙光; 王焕; 王韶辉; 李铁; 李海洋; 张润堂; 田宇
Original assignee: 河南平高通用电气有限公司; 平高集团有限公司; 国家电网有限公司
Priority date: 2019-01-31
Filing date: 2019-12-24
Publication date: 2020-08-06
Also published as: CN109904778B; CN109904778A

Abstract

A switchgear trolley provided with a lightning arrester and a switchgear using the same. The switchgear trolley provided with a lightning arrester comprises a frame (10). A faceplate (11) is provided at a rear side of the frame (10). The frame (10) is provided with a contact arm (30) positioned at a front side of the faceplate (11). The switchgear trolley further comprises a lightning arrester (20) connected to the contact arm (30). A rear end of the lightning arrester (20) is fixed at the frame (10). A rear end of the contact arm (30) is fixed at a front end of the lightning arrester (20). The switchgear comprises a trolley compartment and the switchgear trolley provided with a lightning arrester. In the above solution, the contact arm (30) is directly installed at the frame (10) by means of the lightning arrester (20), thereby reducing occupied space in a radial direction of the contact arm (30). Compared with existing structures, the trolley of the invention has a compact structure and a smaller size.

Description

Switch cabinet handcart with lightning arrester and switch cabinet using the handcart

Cross references to related applications

This application is filed based on the Chinese patent application with the application number 201910101351.4 and the filing date on January 31, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference into this application.

Technical field

The invention relates to a switch cabinet handcart, in particular to a switch cabinet handcart with a lightning arrester and a switch cabinet using the handcart.

Background technique

At present, domestic and foreign air-insulated high-voltage switchgears generally use voltage transformers (PT) and lightning arresters to be installed in the cable room, and the fuse used to protect the voltage transformer is made into a fuse handcart to be installed on the handcart. However, the voltage transformer is fixedly installed in the cable room, which is inconvenient for operation and maintenance. The fixed installation of the lightning arrester in the cable room also poses the safety hazard of electric shock for maintenance personnel, and the structure is not compact enough. In the prior art, there is also a technical solution for installing a voltage transformer in a cable room, and installing a lightning arrester and a fuse on a handcart, and there are still inconveniences in use. In addition, when the voltage transformer, arrester or fuse fails, the existing arrangement requires power failure for maintenance.

In the prior art, there is also a solution for installing voltage transformers, lightning arresters, and fuses on the handcart. The general structure is for example a 12kV voltage transformer handcart disclosed by the Chinese Patent Authorized Announcement No. CN205921284U, including a frame , The rear side of the frame is provided with a handcart panel, and the front side of the handcart panel is provided with a lightning arrester, a contact arm and a fuse (ie, a fusion tube). The handcart panel is provided with a lightning arrester counter observation hole. The upper part of the frame is horizontally arranged with three insulators corresponding to the three-phase circuit. A U-shaped bent plate is installed on the insulator, and the U-shaped bent plate is covered with an insulating cover, and the contact arms are passed through bolts. Directly fixed on the U-shaped bent plate, the contact arm is covered with an insulating sheath and an insulating cover, the lightning arrester is arranged under the insulator and connected to the contact arm, and the fuse is connected to the U-shaped bent plate and connected to the bottom of the handcart through the copper bar Fixed voltage transformer connection. Chinese patents CN207926043U and CN208078498U also disclose similar structures, and the fuse in CN208078498U is installed in the sleeve of the contact arm.

The above structure installs the voltage transformer, lightning arrester, and fuse on the handcart, which reduces the volume of the cabinet and facilitates the overhaul and maintenance of the switch cabinet. However, the lightning arrester and the contact arm on the existing handcart are arranged side by side, and the space is relatively crowded. In order to ensure the creepage distance and ensure the insulation performance, the volume of the handcart needs to be increased and the structure is not compact enough.

Summary of the invention

The purpose of the present invention is to provide a switch cabinet handcart with a lightning arrester to solve the problem that the existing switch cabinet handcart is not compact enough. At the same time, the embodiment of the present invention also provides a switch cabinet using the switch cabinet handcart, which solves the problem of tight internal space caused by the existing switch cabinet due to the insufficient compact structure of the handcart.

The technical scheme adopted by the switchgear handcart with lightning arrester in the embodiment of the present invention is as follows.

The switch cabinet handcart with lightning arrester includes a frame, the rear side of the frame is provided with a handcart panel, the frame is provided with a contact arm on the front side of the handcart panel, the switch cabinet handcart also includes a contact arm The rear end of the lightning arrester is fixed on the frame, and the rear end of the contact arm is fixed on the front end of the arrester.

Beneficial effects: The embodiment of the present invention adopts the above technical solution, and the contact arm is directly mounted on the frame through the lightning arrester, which can save more space in the radial direction of the contact arm. Compared with the prior art, the structure is more compact, which is beneficial to reduce Small handcart volume.

Further, the arrester includes a valve plate group formed by stacking valve plates back and forth, and conductive connecting pieces arranged at the front and rear ends of the valve plate group, and the valve plate group and the conductive connecting pieces are molded by epoxy resin.

Beneficial effects: Compared with the silicon rubber insulated jacket type zinc oxide arrester in the prior art, the arrester adopts epoxy resin casting molding, which is beneficial to the miniaturization of the arrester and can better meet the air clearance of the three-phase arrester.

Further, the conductive connector at the front end of the arrester is provided with a threaded hole, and the rear end of the contact arm is provided with a screw and is fixed in the threaded hole by the screw.

Beneficial effects: the fixing method is simple in structure and convenient to install.

Further, the conductive connector at the front end of the arrester is provided with a protective cover for shielding the connection part of the arrester and the contact arm.

Beneficial effects: the setting of the protective cover can improve the insulation performance of the connection part of the contact arm and the arrester, and improve the reliability of the switchgear trolley.

Further, the switchgear handcart further includes a fuse for protecting the voltage transformer, the fuse is arranged in the contact arm, and the outer circumference of the contact arm is provided with a slot for disassembling and disassembling the fuse, A detachable cover is provided on the slot.

Beneficial effects: the adoption of the above scheme can facilitate the installation and maintenance of the fuse.

A switch cabinet includes a handcart room and a switch cabinet handcart with a lightning arrester. The switch cabinet handcart includes a frame. The rear side of the frame is provided with a handcart panel, and the frame is arranged on the front side of the handcart panel There is a contact arm, the switch cabinet handcart further includes a lightning arrester connected with the contact arm, the rear end of the lightning arrester is fixed on the frame, and the rear end of the contact arm is fixed to the front end of the arrester.

Beneficial effects: The contact arm is directly mounted on the frame through the lightning arrester, which can save more space in the radial direction of the contact arm. Compared with the prior art, the structure is more compact, which is beneficial to reduce the volume of the handcart, thereby solving the existing problem. The internal space of the switch cabinet is tight due to the insufficient compact structure of the handcart.

Beneficial effects: the fixing method has a simple structure and is convenient to install.

Beneficial effects: it can facilitate the installation and maintenance of the fuse.

Description of the drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of a switchgear handcart with a lightning arrester in an embodiment of the present invention;

Figure 2 is a schematic diagram of the structure of the arrester in Figure 1;

Figure 3 is a schematic diagram of the installation structure of the contact arm and the fuse in Figure 1;

Figure 4 is a schematic diagram of the installation structure of the arrester counter in Figure 1;

Figure 5 is a left side view of Figure 4;

Fig. 6 is a schematic structural diagram of a second embodiment of a switchgear handcart with a lightning arrester in an embodiment of the present invention;

Fig. 7 is a schematic diagram of the switch cabinet handcart in Fig. 6 from another perspective, the frame only retains the handcart panel.

detailed description

An example of the switch cabinet handcart with lightning arrester in the embodiment of the present invention is shown in Figures 1 to 5, including a frame 10, a handcart panel 11 is provided on the rear side of the frame 10, and the frame 10 is placed on the handcart The front side of the panel is provided with a lightning arrester 20, a contact arm 30 and a voltage transformer 50. The lightning arrester 20 and the contact arm 30 are arranged on the top of the frame 10, and the voltage transformer 50 is arranged on the bottom of the frame 10.

The structure of the arrester 20 is shown in Figure 2, which is an epoxy resin cast-type arrester 20, which includes a valve plate made of zinc oxide material. The valve plates are stacked in front and back to form a valve plate group 21. The two ends are respectively provided with conductive connecting pieces, which are respectively the front conductive connecting piece 22 and the rear conductive connecting piece 23. The valve plate group 21 and the conductive connecting piece are poured with epoxy resin as the insulating layer 24, and the insulating layer 24 is provided with an umbrella The skirt is beneficial to increase the creepage distance, reduce the size, and can better avoid the situation that the three-phase arrester 20 does not meet the requirements of the clear air distance between phases. The front conductive connecting piece 22 and the rear conductive connecting piece 23 are both provided with threaded holes 25. The lightning arrester 20 is fixed on the frame 10 through the rear conductive connecting piece 23 and screws. The rear end of the contact arm 30 is provided with a screw rod and passes The screw is fixed in the threaded hole 25 at the front end to form a coaxial structure with the arrester 20. The front conductive connector 22 is also provided with a protective cover 26 for shielding the connection part of the contact arm 30. The terminal of the voltage transformer 50 on the side close to the handcart panel 11 is connected to the protective cover 26 through the connecting copper bar 40 so as to contact The arm 30 is turned on, and the terminal on the side away from the handcart panel 11 is grounded through the frame 10 through a common grounding copper bar.

The structure of the contact arm 30 is shown in FIG. 3, including a contact arm main body 31, a conductive rod 33 and a plum contact 32 arranged at the front end of the contact arm main body 31. The contact arm main body 31 is provided with an inner cavity for accommodating the fuse 60, The conductive rod 33 is connected with the rear end of the inner cavity and the rear end extends out of the contact arm main body 31 to form a screw for connecting with the arrester 20. The fuse 60 can be inserted from the front end opening of the contact arm main body 31.

The installation structure of the arrester counter 27 is shown in Fig. 4 and Fig. 5, which adopts an embedded structure to be installed at the installation hole provided on the handcart panel 11, which is convenient for observation and has a beautiful structure. At the same time, the arrester counter 27 is connected to the rear end of the arrester 20, and it can count when used.

In the above-mentioned embodiment, the arrester 20 is molded with epoxy resin, and the contact arm 30 is connected to the front end of the arrester 20 through the conductive rod 33. In other embodiments, the lightning arrester 20 can also be a lightning arrester in the prior art, and the contact arm 30 can also be connected to the arrester 20 in other ways, for example, through a threaded structure provided on the contact arm 30 for fixing, and then using the method The blue structure is fixed. Similarly, the lightning arrester 20 can also be fixed to the frame 10 in other ways, for example, by a flange structure. In addition, in other embodiments, the fuse 60 and the contact arm 30 can also be arranged separately in the manner in the prior art. Furthermore, in other embodiments, for the switch cabinet in which the voltage transformer is arranged in the cable room, the above-mentioned structure of connecting the contact arm 30 to the arrester 20 can also be adopted.

The embodiment of the switch cabinet in the embodiment of the present invention includes a handcart room and a switch cabinet handcart with a lightning arrester. The structure of the switch cabinet handcart is the same as the switch cabinet handcart in any embodiment of the switch cabinet handcart with a lightning arrester. The structure of the car is the same and will not be described in detail here.

The second embodiment of the switchgear handcart with lightning arrester in the embodiment of the present invention is shown in Figures 6 and 7. In this embodiment, the terminal of the voltage transformer 250 on the side far from the handcart panel 211 and the contact arm 230 pass through The connecting copper bar 240 is turned on, and the terminal on the side close to the handcart panel 211 is grounded through the common grounding copper bar 251. In addition, in this embodiment, the lightning arrester 220 is not provided with a protective cover, and the outer peripheral surface of the contact arm 230 is provided with a detachable cover 231. After the detachable cover 231 is opened, the fuse can be taken out or taken out in the radial direction of the contact arm 230. After the fuse is installed, the front and rear ends of the fuse are respectively connected to the plum contact and the conductive rod at both ends of the contact arm. An observation window 232 is provided on the detachable cover 231, and the observation window 232 is made of glass, which can ensure safety and facilitate observation of the fuse. The detachable cover 231 can be connected to the main body of the contact arm with screws, buckles, slide grooves, etc. The detachable cover is used to facilitate fuse replacement, and can seal the fuse as an explosive element, which can reduce the failure rate And avoid spreading to other components in the event of a failure, which is conducive to improving operational reliability. In other embodiments, the observation window 232 can also be replaced with other materials, such as resin.

Claims

The switch cabinet handcart with lightning arrester includes a frame, the rear side of the frame is provided with a handcart panel, the frame is provided with a contact arm on the front side of the handcart panel, the switch cabinet handcart also includes a contact arm The rear end of the lightning arrester is fixed on the frame, and the rear end of the contact arm is fixed on the front end of the arrester.
The switchgear handcart with a lightning arrester according to claim 1, said lightning arrester comprising a valve plate group formed by stacking the valve plates back and forth and conductive connecting pieces arranged at the front and rear ends of the valve plate group. And the conductive connection piece is molded by epoxy resin.
According to the switchgear handcart with a lightning arrester according to claim 2, a threaded hole is provided on the conductive connector at the front end of the arrester, and a screw is provided at the rear end of the contact arm and is fixed in the threaded hole by the screw.
According to the switchgear handcart with lightning arrester according to claim 2 or 3, a protective cover for shielding the connection part of the lightning arrester and the contact arm is provided on the conductive connector at the front end of the arrester.
The switchgear handcart with lightning arrester according to claim 1 or 2 or 3, the switchgear handcart further comprises a fuse for protecting the voltage transformer, the fuse is arranged in the contact arm, the The outer peripheral surface of the contact arm is provided with a slot for disassembling and assembling the fuse, and a detachable cover is provided on the slot.
Switch cabinet, including handcart room and switch cabinet handcart with lightning arrester, switch cabinet handcart with lightning arrester, including frame, the back of the frame is provided with a handcart panel, and the frame is on the front of the handcart panel A contact arm is arranged on the side, the switchgear trolley further includes a lightning arrester connected with the contact arm, the rear end of the arrester is fixed on the frame, and the rear end of the contact arm is fixed on the front end of the arrester.
The switchgear according to claim 6, the arrester includes a valve plate group formed by stacking the valve plates back and forth, and conductive connectors arranged at the front and rear ends of the valve plate group, and the valve plate group and the conductive connectors pass through the ring Oxygen resin casting molding.
The switch cabinet according to claim 7, wherein the conductive connecting piece at the front end of the arrester is provided with a threaded hole, and the rear end of the contact arm is provided with a screw and is fixed in the threaded hole by the screw.
According to the switchgear according to claim 7 or 8, a protective cover for shielding the connection part of the arrester and the contact arm is provided on the conductive connecting piece at the front end of the arrester.
The switch cabinet according to claim 6 or 7 or 8, the switch cabinet handcart further comprises a fuse for protecting the voltage transformer, the fuse is arranged in the contact arm, and the outer circumference of the contact arm A slot for disassembling and assembling the fuse is provided, and a detachable cover is arranged on the slot.