CN109004530A - Outdoor substation and its high pressure protector, high voltage protective unit - Google Patents

Abstract

The present invention relates to a kind of outdoor substation and its high pressure protectors, high voltage protective unit; high voltage protective unit includes fuse and arrester; the leading-out terminal of fuse is provided with protective case; arrester interface is provided on protective case; the arrester conductor being electrically connected for arrester interface with fuse is provided in protective case; while realizing the conductive connection of high voltage protective unit with this; so that connection conductor between the two is without exposed; and then ensure that the leakproofness between fuse and arrester, realize the purpose of the sealed insulation of interface.

Description

Outdoor substation and its high voltage protection device, high voltage protection unit

technical field

The invention relates to an outdoor substation, a high-voltage protection device and a high-voltage protection unit thereof.

Background technique

In my country's distribution network, there are a large number of pole-mounted switchgears, especially in the rural 10kv distribution network. The substation system is composed of fuses, lightning arresters, distribution transformers, low-voltage integrated distribution boxes and connecting cables. The main power supply method in the grid. The lead-out line of the high-voltage line is connected to the inlet end of the fuse, and is divided into two branches through the outlet end of the fuse. One branch is connected to the distribution transformer by the high-voltage incoming cable for subsequent voltage transformation and distribution; the other branch The circuit is connected to the incoming terminal of the lightning arrester, and the lightning arrester is grounded from the outgoing terminal of the lightning arrester through the grounding cable to realize lightning protection. At present, these primary components involved in the substation are assembled through decentralized procurement, on-site assembly and debugging. Due to the large number of domestic manufacturers of substation primary components, the component interfaces are not uniform, such as the inlet and outlet of fuses, the inlet and outlet of lightning arresters, etc. During the on-site assembly and debugging process, due to the large number of primary components, it is very inconvenient to install and assemble on site. Therefore, it is a trend to improve installation efficiency to carry out modular design of each component. For example, in the Chinese patent document CN2476097Y, a kind of lightning arrester and fuse is disclosed, and the lightning arrester is fixed by a rigid bracket. On the insulator of the fuse, the lightning arrester and the fuse constitute a modular design, but the modularization of the combined electrical appliance is not complete, and the fuse and the lightning arrester are still connected by cables with exposed wire ends. Natural factors can easily lead to cable corrosion, resulting in increased contact resistance, increased line loss, etc., which will lead to the inability to achieve closed insulation at the interface; and this combined electrical appliance simply fixes a fuse and a lightning arrester together to form a unit, in the actual installation, it is still necessary to install the three units in sequence to achieve fixation, and the assembly is relatively cumbersome.

Contents of the invention

The purpose of the present invention is to provide a high-voltage protection unit to solve the problem in the prior art that the wiring between the arrester and the fuse is exposed and there is no protection; the purpose of the present invention is also to provide a high-voltage protection unit with the high-voltage protection unit. Protection device; the purpose of the present invention is also to provide an outdoor substation with the high voltage protection device.

In order to achieve the above object, the technical solution of the high voltage protection unit of the present invention is:

The high-voltage protection unit includes a fuse and a lightning arrester. The outlet end of the fuse is provided with a protective shell, the protective shell is provided with a lightning arrester interface, and a lightning arrester conductor for electrically connecting the lightning arrester interface and the fuse is arranged in the protective shell.

The protective shell is also provided with a protective shell socket for plug-in connection with the incoming plug of the high-voltage incoming cable, and a protective shell socket conductor is provided in the protective shell to realize the electrical connection between the fuse and the protective shell socket.

The lightning arrester interface includes a connecting screw sleeve electrically connected to the lightning arrester conductor, and the wire inlet end of the lightning arrester is threadedly connected with the connecting screw sleeve to realize electrical connection with the lightning arrester conductor.

The fuse is a closed fuse with a closed insulator cast on the outer periphery. The inlet end of the fuse is a fuse socket cast in the closed insulator. The protective shell and the insulator are cast integrally. in the casing.

The fuse is vertically arranged at the left end of the protective case, the protective case socket is arranged at the right end of the protective case, and the lightning arrester is vertically arranged at the lower side of the protective case.

The technical scheme of the high voltage protection device of the present invention is:

The high-voltage protection device includes three high-voltage protection units. The high-voltage protection unit includes a fuse and a lightning arrester. Connected arrester conductors.

The protective shell is also provided with a protective shell socket for plug-in connection with the incoming plug of the high-voltage incoming cable, and a protective shell socket conductor is provided in the protective shell to realize the electrical connection between the fuse and the protective shell socket.

The lightning arrester interface includes a connecting screw sleeve electrically connected to the lightning arrester conductor, and the wire inlet end of the lightning arrester is threadedly connected with the connecting screw sleeve to realize electrical connection with the lightning arrester conductor.

The fuse is a closed fuse with a closed insulator cast on the outer periphery. The inlet end of the fuse is a fuse socket cast in the closed insulator. The protective shell and the insulator are cast integrally. in the casing.

The fuse is vertically arranged at the left end of the protective case, the protective case socket is arranged at the right end of the protective case, and the lightning arrester is vertically arranged at the lower side of the protective case.

The high-voltage protection device also includes a connection plate provided with a fixing structure, and three high-voltage protection units are fixed on the connection plate at intervals along the front-rear direction.

The technical scheme of the outdoor substation of the present invention is:

The outdoor substation includes a high-voltage protection device. The high-voltage protection device includes three high-voltage protection units. The high-voltage protection unit includes a fuse and a lightning arrester. Arrester conductors for electrical connection between the arrester interface and the fuse are provided.

The outdoor substation includes a transformer and a high-voltage incoming cable connecting the transformer and the high-voltage protection device. One end of the high-voltage incoming cable is provided with an incoming plug, and the protective shell is also provided with a plug-in connection with the incoming plug of the high-voltage incoming cable. The protective shell socket is provided with a protective shell socket conductor to realize the electrical connection between the fuse and the protective shell socket.

The lightning arrester interface includes a connecting screw sleeve electrically connected to the lightning arrester conductor, and the wire inlet end of the lightning arrester is threadedly connected with the connecting screw sleeve to realize electrical connection with the lightning arrester conductor.

The fuse is a closed fuse with a closed insulator cast on the outer periphery. The inlet end of the fuse is a fuse socket cast in the closed insulator. The protective shell and the insulator are cast integrally. In the protective shell, the cable includes a high-voltage lead-out cable connected between the high-voltage line and the wire-in terminal of the fuse, and the end of the high-voltage lead-out cable is provided with a lead-out cable plug that is mated with the fuse socket .

The fuse is vertically arranged at the left end of the protective case, the protective case socket is arranged at the right end of the protective case, and the lightning arrester is vertically arranged at the lower side of the protective case.

The high-voltage protection device also includes a connection plate provided with a fixing structure, and three high-voltage protection units are fixed on the connection plate at intervals along the front-rear direction.

The other end of the high-voltage incoming cable is provided with an outgoing plug, and the transformer includes a transformer body, and the transformer body is provided with a transformer socket with the end facing upward for plugging and matching with the outgoing plug of the high-voltage incoming cable.

The beneficial effects of the present invention are: compared with the prior art, the high-voltage protection unit involved in the present invention is provided with a protective case at the outlet end of the fuse, and is connected to the arrester through the arrester interface of the protective case to realize the fixation. The lightning arrester conductor that connects the outlet end of the fuse with the lightning arrester interface, so as to realize the conductive connection of the high-voltage protection unit, and at the same time, make the connecting conductor between the two not exposed, thereby ensuring the sealing between the fuse and the lightning arrester, and realizing The purpose of sealing and insulating the interface between the fuse and the arrester is achieved.

Description of drawings

Fig. 1 is a schematic diagram of an assembly structure of an embodiment of an outdoor substation of the present invention;

Fig. 2 is a schematic structural diagram of the high voltage protection module in Fig. 1;

Fig. 3 is a vertical sectional view of Fig. 2;

Fig. 4 is a schematic structural diagram of the distribution transformer in Fig. 1;

Fig. 5 is a schematic structural view of the stand in Fig. 1;

Fig. 6 is a schematic structural diagram of the elbow plug in Fig. 1;

FIG. 7 is a schematic structural diagram of the column plug in FIG. 1 .

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The specific embodiment of the outdoor substation of the present invention, as shown in Figure 1 to Figure 7, the outdoor substation includes a high-voltage protection device 3, a cable module, a transformer module, a low-voltage distribution box module, a bench module, etc., the high-voltage protection device 3 It includes three high-voltage protection units. The high-voltage protection unit includes fuses 32 and lightning arresters 34. The cable module includes high-voltage outgoing cables 2, high-voltage incoming cables 4, low-voltage overhead outgoing cables 10 and low-voltage incoming ground cables 8. The distribution transformer 5 and the low-voltage distribution box 11 are fixedly installed together, each module is fixed on a stand, and the stand provides basic support and installation constraints for each part.

The working principle is that the substation introduces power to the fuse 32 through the high-voltage lead-out cable 2, and then one branch is grounded through the lightning arrester 34, and the other branch is connected to the high-voltage incoming cable 4 to provide over-retention protection and over-current protection for downstream electrical equipment. Voltage protection; the high-voltage incoming cable 4 is electrically connected to the distribution transformer 5, and then divided into two outlets after being distributed by the low-voltage distribution box 11, one of which is the outlet through the overhead line cable, and the other is the outlet through the low-voltage distribution box 11. Incoming ground cable 8 is outgoing.

The bench module consists of two cement poles 9 installed side by side on the ground 7, and a fixed bracket 6 fixed on the cement poles 9. The distribution transformer 5 and the low-voltage distribution box 11 are installed on the fixed bracket 6. The high-voltage protection device 3 is arranged on the upper end of one of the cement poles 9, and the cable is wound on the cement pole 9 and fixed on the bracket on the cement pole 9, and plays the role of installation, fixation and support for other equipment in the outdoor substation through the stand.

The high-voltage protection unit includes a fuse 32 and a lightning arrester 34 electrically connected to the fuse 32. The fuse 32 and the lightning arrester 34 are fixed together by a protective shell 35. The fuse and the lightning arrester 34 are respectively fixedly arranged on the left side of the protective shell 35 and the On the lower side, the wire-in end of the fuse 32 is provided with a fuse socket 31 with the end facing up and mated with the plug of the high-voltage lead-out cable 2. The wire-out end of the fuse 32 is provided with a protective shell 35, and the protective shell 35 has The lightning arrester interface and the shell socket 36, the shell socket 36 is mated with the plug of the high-voltage incoming cable 4, wherein the fuse 32 is a closed fuse, which is different from the traditional drop-out fuse and is a fully enclosed casting Type structure, not easily affected by external weather such as rain, snow, condensation, wind and sand, the outer periphery of the fuse is poured with a closed insulator, and the fuse socket, the shell socket, the shell and the closed insulator are integrally cast; the arrester 34 is a metal Zinc oxide arrester 34, connecting plate 33 is provided with perforation for arrester to pass through; Arrester interface for connecting with arrester 34 is provided on the lower side of protective shell 35, and a conductive copper sheet is provided at the arrester interface, the incoming line of arrester The end is a threaded conductive end, and the lightning arrester 34 passes through the connecting plate 33 and is threadedly connected with the second interface to realize the electrical connection between the lightning arrester 34 and the fuse. The plug realizes quick connection. In actual use, three high-voltage protection units are installed together on a connecting plate 33. Specifically, the protective shell and fuse cast integrally with the closed insulator are installed on the connecting plate 33 first, and then the lightning arrester is passed through the connecting plate 33. The perforation is screwed on the arrester interface on the lower side of the protective shell to complete the assembly of the high voltage protection device. And the high-voltage protection device is installed below the high-voltage lead-out cable and above the transformer to provide over-current and over-voltage protection for downstream electrical equipment.

As shown in the cross-sectional view of the high-voltage protection unit in Figure 3, a copper incoming conductor 321 is arranged in the fuse socket 31 on the upper end of the fuse, and the incoming conductor 321 is welded and fixed to the incoming connecting pipe 322, and there is a concave hole in the incoming connecting pipe 322 Groove, the conductive guide ring 323 is fixed in the groove, and the fuse also includes a fuse tube, which is a removable replaceable part, which is inserted into the hole at the bottom of the fuse for installation and connection, and the fuse tube passes through the conductive The friction force of the guide ring is firmly fixed, and the melting pipe is a hollow structure, including the first melting pipe section 324, the second melting pipe section 325, the third melting pipe section 328, and the fourth melting pipe section 329, wherein the first and third melting pipe sections It is made of copper and plays a conductive role. The second and fourth melting pipe sections are made of insulating material and play an insulating role. Each section of the melting pipe is connected to each other through threads. The interior of the fuse tube is set as a fuse core 326 extending up and down. The upper part of the fuse core 326 is connected to the first melt tube segment 324, and the lower part is connected to the third melt tube segment 328 to realize electrical conduction. It is related to the size of the device fusing current. The fuse also includes a snap ring 327 fixed on the lower part of the fuse core. When the fuse core is blown, the lower part of the fuse core will fall, and the position limiting function of the snap ring 327 can prevent the fuse core from falling out of the fuse.

Outlet connection bar 330 is extended from the outlet end of the fuse. Outlet connection bar 330 can realize the electrical connection between conductive guide ring 323, conductor 331 in the interface of the arrester, and conductor 332 in the socket of the protective shell, and the connection occurs. The interface between the rod and the lightning arrester and the conductor in the socket of the protective shell are welded and fixed.

The cables include a high-voltage lead-out cable 2 connected between the high-voltage line 1 and the fuse 32, a high-voltage incoming cable 4 connected between the fuse 32 and the distribution transformer 5, and a low-voltage cable installed at the outlet end of the low-voltage distribution box 11. An overhead outgoing cable 10 and a low-voltage incoming ground cable 8. In order to ensure the convenience of installation, one end of the high-voltage lead-out cable 2 adopts a cylindrical plug 13, and the two ends of the high-voltage incoming cable 4 adopt an elbow-type plug 12. The fully enclosed and fully insulated structure of plug-in installation and electrical connection ensures that the live conductor is not exposed.

The upper side of the distribution transformer 5 is provided with a transformer socket 51 for plugging and mating with the plug of the high-voltage incoming cable 4, and the side wall of the transformer is provided with a distribution socket for inter-plugging and mating with the low-voltage distribution box 11. The socket 52, wherein the power distribution socket 52 is a cast-type sealed connector, which not only acts as an oil seal for the transformer but also realizes the shortest electrical connection with the low-voltage power distribution module, that is, the low-voltage power distribution box 11 It is bonded to the distribution transformer 5 to reduce the length of the connecting cable between the two. The distribution transformer 5 is a capacity-regulating and voltage-regulating transformer, and can also be replaced by an amorphous alloy transformer, a high overload transformer, or a special transformer.

The low-voltage distribution box 11 is connected back-to-back with the distribution transformer 5, and is fixed on the stand by the fixed bracket 6. There are two kinds of outlets of the low-voltage distribution box 11, one is the outlet through the low-voltage overhead cable 10, and the other is It is the 8 outlets of the low-voltage ground cable.

By replacing the previous exposed cable connectors with the plug-in fit of plugs and sockets at each joint position, the phenomenon of exposed elevators and unreliable insulation sheaths is eliminated from the source, and the reliability is higher; universal plug size The compatibility is stronger, which can significantly reduce the on-site construction time, save construction costs and human resources. And through the modular design of each device, the existing standard substation's component interfaces are not uniform, resulting in complicated wiring, messy wiring, and long construction period. By unifying the plug size and parameters, the high-voltage line 1 and high-voltage protection are realized. The interconnection interface of the device 3, the interconnection interface between the high-voltage protection device 3 and the distribution transformer 5, the interconnection interface between the distribution transformer 5 and the low-voltage distribution box 11, and the generalization and standardization.

In other embodiments, the fuse and the lightning arrester may not be fixed together. By setting sockets at both the outlet end of the fuse and the inlet end of the lightning arrester, and setting plugs at both ends of the connecting cable, it is also possible to realize fully enclosed and fully insulated; The connector of the connection cable between the device and the arrester may not be set through the bottom side of the protective shell, but directly on the mounting base, and the connection between the connecting cable and the arrester is realized through the connection between the mounting base and the arrester; The same side is set on the same side of the mounting base or on other sides; the connection between the distribution transformer and the low-voltage distribution box can also be realized by plugging the cable with the plug and the socket; the protective shell can only be set to connect with the arrester An interface of the fuse, which can be directly connected to the high-voltage incoming cable from the outlet of the fuse; the shield and the fuse can be sealed by screwing; the conductor in the shield can be set as a conductive Connect with the lightning arrester through a conductive cable, and then fix the lightning arrester.

The high-voltage protection device involved in the present invention includes three high-voltage protection units. The embodiment of the high-voltage protection unit is consistent with the above-mentioned embodiment of the high-voltage protection unit of the outdoor substation, and will not be described in detail.

The embodiment of the high-voltage protection unit involved in the present invention is consistent with the above-mentioned embodiment of the high-voltage protection unit of the outdoor substation, and will not be expanded in detail.

Claims (18)

1. A high-voltage protection unit, including a fuse and a lightning arrester, characterized in that: the outlet end of the fuse is provided with a protective shell, the protective shell is provided with a lightning arrester interface, and the protective shell is provided with an electrical connection between the lightning arrester interface and the fuse arrester conductor. 2. The high-voltage protection unit according to claim 1, characterized in that: the protective shell is also provided with a protective shell socket for plug-in connection with the incoming plug of the high-voltage incoming cable, and the protective shell is provided with a fuse to realize A shield socket conductor electrically connected to the shield socket. 3. The high-voltage protection unit according to claim 1 or 2, characterized in that: the lightning arrester interface includes a connecting screw sleeve electrically connected to the lightning arrester conductor, and the incoming line end of the lightning arrester is connected with the connecting screw sleeve thread to realize connection with the lightning arrester conductor electrical connection. 4. The high-voltage protection unit according to claim 2, characterized in that: the fuse is a closed fuse with a closed insulator cast on the outer periphery, and the inlet end of the fuse is a fuse socket cast in the closed insulator, The protective shell and the insulator are cast integrally, and the shell socket is cast in the protective shell. 5. The high voltage protection unit according to claim 2, characterized in that: the fuse is arranged vertically at the left end of the protective case, the protective case socket is arranged at the right end of the protective case, and the arrester is vertically arranged at the lower side of the protective case . 6. The high-voltage protection device includes three high-voltage protection units. The high-voltage protection unit includes a fuse and a lightning arrester. The arrester conductor that is electrically connected to the arrester interface and the fuse. 7. The high-voltage protection device according to claim 6, characterized in that: the protective shell is also provided with a protective shell socket for plug-in connection with the incoming plug of the high-voltage incoming cable, and a fuse is provided in the protective shell to realize A shield socket conductor electrically connected to the shield socket. 8. The high-voltage protection device according to claim 6 or 7, characterized in that: the arrester interface includes a connecting screw sleeve electrically connected to the conductor of the arrester, and the inlet end of the arrester is threadedly connected with the connecting screw sleeve to realize connection with the arrester conductor electrical connection. 9. The high-voltage protection device according to claim 7, characterized in that: the fuse is a closed fuse with a closed insulator cast on the outer periphery, and the inlet end of the fuse is a fuse socket cast in the closed insulator, The protective shell and the insulator are cast integrally, and the shell socket is cast in the protective shell. 10. The high voltage protection device according to claim 7, characterized in that: the fuse is arranged vertically at the left end of the protective case, the protective case socket is arranged at the right end of the protective case, and the lightning arrester is vertically arranged at the lower side of the protective case . 11. The high-voltage protection device according to claim 6 or 7, characterized in that the high-voltage protection device further comprises a connection plate provided with a fixing structure, and three high-voltage protection units are fixed on the connection plate at intervals along the front and rear directions. 12. An outdoor substation, including a high-voltage protection device. The high-voltage protection device includes three high-voltage protection units. The high-voltage protection unit includes a fuse and a lightning arrester. It is characterized in that: the outlet end of the fuse is provided with a protective shell, and the protective shell is provided with The lightning arrester interface is provided with a lightning arrester conductor for electrical connection between the lightning arrester interface and the fuse. 13. The outdoor substation according to claim 12, characterized in that: the outdoor substation includes a transformer and a high-voltage incoming cable connecting the transformer and a high-voltage protection device, one end of the high-voltage incoming cable is provided with an incoming plug, and the protective device The shell is also provided with a shell socket for plug-in connection with the incoming plug of the high-voltage incoming cable, and a shell socket conductor for electrically connecting the fuse to the shell socket is arranged in the shell. 14. The outdoor substation according to claim 12 or 13, characterized in that: the lightning arrester interface includes a connecting screw sleeve electrically connected to the conductor of the lightning arrester, and the incoming line end of the lightning arrester is connected to the connecting screw sleeve thread to realize electrical connection with the lightning arrester conductor. connect. 15. The outdoor substation according to claim 13, characterized in that: the fuse is a closed fuse with a closed insulator cast on the outer periphery, and the inlet end of the fuse is a fuse socket cast in the closed insulator, so The protective shell and the insulator are integrally casted, and the socket of the protective shell is cast in the protective shell. The cable includes a high-voltage lead-out cable connected between the high-voltage line and the incoming end of the fuse, and the high-voltage lead-out cable The end is provided with a lead-out cable plug which is mated with the fuse socket. 16. The outdoor substation according to claim 13, wherein the fuse is vertically arranged at the left end of the protective case, the protective case socket is arranged at the right end of the protective case, and the lightning arrester is vertically arranged at the lower side of the protective case. 17. The outdoor substation according to claim 12 or 13, wherein the high-voltage protection device further comprises a connection plate provided with a fixing structure, and three high-voltage protection units are fixed on the connection plate at intervals along the front and rear directions. 18. The outdoor substation according to claim 13, characterized in that: the other end of the high-voltage incoming cable is provided with an outgoing plug, the transformer includes a transformer body, and the transformer body is provided with an upward end for connecting with the high-voltage incoming line. The outlet plug of the cable is plugged into the matching transformer socket.