CN104392862B - Fuse auxiliary earth switch module - Google Patents

Abstract

The invention relates to a fuse auxiliary grounding switch assembly, which includes a grounding switch electrically connected to the fuse and an insulating base body for sealing the grounding switch, and the outer surface of the insulating base body is coated with a grounding layer; the front end of the insulating base body A connecting part cavity is provided; the grounding switch includes a long conductive rod electrically connected to the outlet end of the fuse and the front end connected to the rear end of the connecting part cavity; The grounding connecting rod inside the rod, the elastic insulating plunger sleeved outside the grounding connecting rod, the grounding end cover located at the outer port of the cavity of the connecting part, and the grounding end cover and the elastic insulating plunger which are movably penetrated and connected with the grounding connecting rod Insulated connecting rods for fixed connections. The object of the present invention is to provide a fuse auxiliary grounding switch assembly with simple structure and reliable operation, so as to ensure that the outlet terminal of the fuse is grounded during the maintenance of the switchgear and ensure safe maintenance.

Description

Fuse Auxiliary Earthing Switch Assemblies

technical field

The invention relates to a fuse auxiliary earthing switch assembly.

Background technique

In recent years, the miniaturization of switchgear is a research hotspot in the industry. At present, most of the domestic 10kV switchgears are made of fixed modules connected by busbars, and the air distance is strictly implemented according to 125mm, so the cabinets are large in size and the use environment is also limited; while most of the miniaturized switchgears use the air-filled cabinet solution to meet the reduction of phases And the relative insulation distance. Since the charged SF6 gas is a greenhouse gas, it is not a promotional product. In order to make up for the shortcomings of SF6 inflatable cabinets such as greenhouse effect and easy air leakage, as well as the shortcomings of large footprint of air-insulated switchgear. At present, it is necessary to develop a new type of switchgear, which can not only meet the requirements of miniaturization, but also meet the requirements of environmental protection without using greenhouse gases. Therefore, solid insulation technology has become one of the research and development directions that can meet the above needs. During the research and development of solid insulation technology, when the combination of load switch and fuse is applied, the grounding switch is required to provide auxiliary grounding for the fuse. The reliability design of the grounding switch is an important technical research and development point to provide a safe maintenance environment for fuses.

Contents of the invention

The object of the present invention is to provide a fuse auxiliary grounding switch assembly with simple structure and reliable operation, so as to ensure that the outlet terminal of the fuse is grounded during the maintenance of the switchgear and ensure safe maintenance.

The purpose of the present invention is achieved through the following technical solutions:

A fuse auxiliary grounding switch assembly, which includes a grounding switch electrically connected to the fuse and an insulating base that seals the grounding switch. The outer surface of the insulating base is coated with a grounding layer; the front end of the insulating base is provided with a connection part cavity; the grounding switch includes a long conductive rod electrically connected to the outlet end of the fuse and the front end connected to the rear end of the connection part cavity; The grounding connecting rod, the elastic insulating plunger sleeved outside the grounding connecting rod, the grounding end cover located at the outer port of the connecting part cavity, and the grounding end cover and the elastic insulating plunger which are movably penetrated and fixedly connected with the grounding connecting rod Insulating connecting rod; when grounding, the grounding end cover and the long conductive rod form an electrical connection through the grounding connecting rod pulled by the insulating connecting rod.

Compared with the prior art, the present invention has the advantages of:

1. The fuse cavity and the grounding switch cavity are injection-molded at one time through insulating materials such as epoxy resin, and the outer surface of the insulating matrix composed of insulating materials is coated with a grounding layer to achieve uniform electric field shielding and reliable grounding. , increase the safety and reliability of personal and equipment operation, and its appearance can be directly touched, and make the insulating base of the two-phase fuse close together without reducing the insulation between phases. The safe insulation distance is greatly shortened, effectively reducing the volume of the switch cabinet;

2. When the isolating switch contact in the switch cabinet is grounded or the fuse is blown, the grounding switch component is driven by the linkage of the operating structure to achieve reliable auxiliary grounding and form a visible fracture to ensure safety;

3. The fuse auxiliary grounding switch assembly can be used in places with harsh environments, and the switch cabinet is truly maintenance-free;

4. The interface size of the conical butt joint of the grounding switch is highly versatile, and the existing universal connector can be used for electrical connection, and it can be reliably connected with other electrical components;

5. The modular design can reduce the number of molds most reasonably, improve product versatility, and facilitate combination and connection.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of an embodiment of the present invention in use state.

Figure 2 is a schematic side view of the embodiment of Figure 1 .

Fig. 3 is a schematic cross-sectional view of a working state of the grounding switch assembly.

Fig. 4 is a schematic sectional view of another working state of the grounding switch assembly.

Reference numerals: 1 main switch assembly, 2 fuse assembly, 21 insulating base, 211 fuse chamber, 212 butt joint insertion chamber, 213 threaded connector accommodation chamber, 214 elastic insulating plug, 215 plug fixing piece, 216 Connection cavity, 217 Tapered butt joint, 22 Grounding layer, 23 Fuse unit, 231 Incoming line conductive shielding seat, 2311 Shielding convex edge, 232 Incoming line conductive joint, 233 Fuse, 234 Outgoing line conductive shielding seat, 2341 Shielding convex edge, 2342 shielding convex edge, 235 outgoing conductive connector, 236 striker, 237 watch strap contact finger, 238 pair of conductive fixed seat, 24 grounding switch, 241 long conductive rod, 2411 live display shielding ring, 242 grounding connecting rod , 243 elastic insulating plunger, 244 grounding end cap, 2441 fixed insert, 2442 conductive terminal, 2443 elastic conductive contact piece, 245 insulating connecting rod, 3 busbar assembly, 4 switch cabinet, 5 operating mechanism.

detailed description

The content of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments of the description:

1 to 4 are schematic diagrams of an embodiment of a fuse auxiliary grounding switch assembly provided by the present invention.

A fuse auxiliary grounding switch assembly, characterized in that it includes a grounding switch 24 electrically connected to a fuse 23 and an insulating base 21 that seals the grounding switch 24, and the outer surface of the insulating base 21 is coated with a grounding layer 22. The front end of the insulating base 21 is provided with a connecting part cavity 216; the grounding switch 24 includes a long conductive rod 241 electrically connected to the outlet end of the fuse 23 and the front end is connected to the rear end of the connecting part cavity 216. The grounding connecting rod 242 in the connecting part cavity 216 and movably connected to the long conductive rod 241, the elastic insulating plunger 243 sleeved outside the grounding connecting rod 242, and the grounding end cap located at the outer port of the connecting part cavity 216 244 and the insulating connecting rod 245 that is movable through the grounding end cover 244 and the elastic insulating plunger 243 and is fixedly connected with the grounding connecting rod 242; The ground link 242 forms an electrical connection. The grounding switch 24 is grounded synchronously with the main switch assembly 1 driven by the operating mechanism 5 . When grounded, the insulating link 245 is pulled out to form a visible fracture.

The outer surface of the insulating substrate 21 is reliably connected to the ground potential by coating with metal particles. The high-voltage conductor forms a voltage-equalizing electrode structure through reasonable design, and forms two potentials of high and low voltage with the external grounding layer 22, and passes through a certain thickness of solid insulation in the middle. The matrix forms a stable and reliable high voltage insulation. Therefore, the solid insulation design reduces the volume of the overall structure by 2/3 compared with the original air-type structure, and the insulation performance does not change due to the influence of altitude and other external environmental factors.

The ground end cover 244 includes a fixed insert 2441 inlaid on the front wall surface of the connecting part cavity 216, a conductive terminal 2442 that is threadedly matched with the fixed insert 2441 and has a hole for the insulating connecting rod 245 to penetrate, and is provided on the insulating The connecting rod 245 passes through the elastic conductive contact piece 2443 in the hole and is electrically connected with the conductive terminal 2442; 2443 is electrically connected to the conductive terminal 2442 .

In order to extrude the air in the connecting portion cavity 216, the conductive terminal 2442 presses against the elastic insulating plunger 243; when the insulating connecting rod 245 is inserted into the elastic insulating plunger 243, the insulating connecting rod 245 and the elastic insulating plunger 243 For interference fit. The outer surface of the elastic insulating plunger 243 has a certain taper. When the insulating connecting rod 245 is inserted into the elastic insulating plunger 243, the part of the insulating rod 245 in contact with the elastic insulating plunger 243 has a certain taper, thereby realizing the insulation of the connecting rod 245. Interference fit with the elastic insulating plunger 243.

The end of the insulating base 21 located at the rear end of the long conductive rod 241 is a tapered butt joint 217 formed of a standard outer cone structure, and the outer surface of the tapered butt joint 217 is not coated with the grounding layer 22 . The bottom of the tapered butt joint 217 is provided with an annular convex edge 218 . Since the conical butt connector 217 adopts a standard outer conical structure, it can be easily connected and expanded with other electrical components such as cable connectors as required. The annular convex edge 218 is disposed at the bottom of the conical butt joint 217 and close to the ground layer 22 , which acts to uniform the electric field at the junction of the ground layer 22 and the uncoated ground layer 22 .

A live display shielding ring 2411 surrounding the long conductive rod 241 and embedded in the insulating base 21 is provided at the joint between the tapered butt joint 217 and the main body of the insulating base 21 . The charging display shielding ring 2411 is used to sense and obtain the capacitance signal to realize the function of detecting the charging situation.

As shown in Fig. 3, in order to ensure the convenient and reliable replacement of the fuse 233, the fuse unit 23 is installed in the fuse cavity 211 of the insulating base 21, and the outgoing conductive shielding seat 234 and the long conductive rod 241 are integrally formed during the casting process. The electrical connection and failure rate between the fuse unit 23 and the grounding switch 24 can be greatly reduced. The action of the grounding switch 24 is linked with the grounding station of the main switch assembly 1 to ensure that both ends of the fuse 233 are grounded at the same time when the fuse 233 is replaced. At the same time, it can also meet the requirement of having a visible fracture when the switchgear is closed and opened, and the safety and reliability are enhanced.

Claims (6)

1. a kind of fuse auxiliary earth switch module, it is characterised in that：The ground connection that it includes electrically connecting with fuse (23) is opened Close (24) and the insulating body (21) of sealing is carried out to earthed switch (24), the outer surface of insulating body (21), which is coated with, to be connect Stratum (22)；Insulating body (21) front end offers connecting portion cavity volume (216)；The earthed switch (24) includes and fusing The connected long conducting rod (241) of leading-out terminal electrical connection and front end and connecting portion cavity volume (216) rear end of device (23), it is arranged in and is connected In portion's cavity volume (216) and ground connection connecting rod (242) that activity is connected in long conducting rod (241), it is sheathed on ground connection connecting rod (242) outside Elastic insulated plunger (243), the ground connection end cap (244) positioned at connecting portion cavity volume (216) external port and being actively located in connects The insulated connecting rod (245) being fixedly connected in ground end cap (244) and elastic insulated plunger (243) and with ground connection connecting rod (242)；Ground connection When, ground connection end cap (244) is formed with long conducting rod (241) by the ground connection connecting rod (242) pulled by insulated connecting rod (245) to be electrically connected Connect.

2. fuse auxiliary earth switch module according to claim 1, it is characterised in that：The ground connection end cap (244) Including be embedded on the wall of connecting portion cavity volume (216) front end fixation inserts (2441), be threadedly coupled with fixed inserts (2441) Coordinate and the conductive termination (2442) with insulated connecting rod (245) perforating and in insulated connecting rod (245) perforating and The elastic conduction contact (2443) electrically connected with conductive termination (2442)；When ground connection connecting rod (242) is drawn out, connecting rod is grounded (242) electrically connected by acting against the elastic conduction contact (2443) on ground connection connecting rod (242) with conductive termination (2442).

3. fuse auxiliary earth switch module according to claim 2, it is characterised in that：The conductive termination (2442) The elastic insulated plunger of top pressure (243)；When insulated connecting rod (245) insert elastic insulated plunger (243) when, insulated connecting rod (245) with Elastic insulated plunger (243) is interference fit.

4. the fuse auxiliary earth switch module according to claim 1-3 any one, it is characterised in that：The insulation Matrix (21), its termination for being located at long conducting rod (241) rear end is the taper butt joint constituted using the outer bevel-type structure of standard (217), the uncoated ground plane in outer surface (22) of taper butt joint (217).

5. fuse auxiliary earth switch module according to claim 4, it is characterised in that：The taper butt joint (217) bottom is provided with convex annular edge (218).

6. fuse auxiliary earth switch module according to claim 4, it is characterised in that：The taper butt joint (217) junction with insulating body (21) main body is provided around long conducting rod (241) and is embedded in insulating body (21) Powered display shading ring (2411).