An insulating switch device

Abstract

The invention discloses an insulating switchgear, comprising a fixing seat, and a switch room and a transmission room arranged on the top of the fixing seat; the switch room comprises a shell, and a switch assembly arranged on the shell, a power connection terminal and a load connection terminal; the shell adopts a fully enclosed structure, and the interior of the shell adopts dry air or nitrogen as an insulating medium to ensure the insulation performance of the switch assembly; the switch assembly is respectively provided with a power connection copper bar and a load connection copper bar on the upper and lower sides; the power connection copper bar is fixedly connected to the power connection terminal; the load connection copper bar is fixedly connected to the load connection terminal through a connecting copper rod; an apron is provided on the top of the load connection terminal; the apron is provided with a groove to facilitate the installation of the connecting copper rod; the apron on the top of the load connection terminal covers the connecting copper rod therein, which can increase the insulation distance between the connecting copper rod and the shell and the phase line, thereby improving the insulation performance; the transmission room is transmission-connected to the switch assembly.

Description

Technical Field

[0001] The invention relates to the technical field of electrical control equipment, in particular to an insulating switch device. Background Art

[0002] Since SF6 gas has good insulation and arc extinguishing properties, SF6 switches have the advantages of safety, reliability, simple structure and low price. At present, SF6 switches still occupy the mainstream market in 10kV switchgear.

[0003] SF6 gas is a greenhouse gas, and its molecules can remain in the atmosphere for up to 3,200 years. It is one of the six greenhouse gases that are prohibited from being emitted in the Kyoto Protocol. Therefore, in the context of advocating energy conservation and environmental protection, the power switch industry must gradually reduce the use of SF6 gas switchgear. Due to human needs and the guidance of the market, the power industry is committed to finding and developing more environmentally friendly and reliable switchgear products. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an insulating switchgear, which effectively improves the insulation performance of the switchgear.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an insulating switch device, including a fixing base, and a switch room, a transmission room and an instrument room arranged on the top of the fixing base;

[0006] The switch room includes a shell, and a switch assembly, a power connection terminal and a load connection terminal arranged on the shell. The shell adopts a fully enclosed structure, and the interior of the shell adopts dry air or nitrogen as an insulating medium. The switch assembly is respectively provided with a power connection copper bar and a load connection copper bar on the upper and lower sides. The power connection copper bar is fixedly connected to the power connection terminal, and the load connection copper bar is fixedly connected to the load connection terminal through a connecting copper rod. An apron is provided on the top of the load connection terminal, and the apron is provided with a groove. One end of the connecting copper rod is provided in the groove of the apron, and the other end is connected to the load connection copper bar. One end of the power connection terminal and one end of the load connection terminal both extend out of the shell; the transmission chamber is transmission-connected to the switch assembly.

[0007] Furthermore, the connecting copper rod is in a shape of being bent in the middle.

[0008] Furthermore, a first pressure release device is provided at the bottom of the shell.

[0009] Furthermore, the transmission chamber is provided with a density meter for monitoring the gas density of the shell.

[0010] Further, the switch assembly includes a main switch module and a three-position isolating and grounding switch module, the main switch module includes a supporting frame, an insulating protection module arranged in the supporting frame, a main transmission shaft rotatably connected to the front end of the supporting frame, a transmission component for separately connecting the main transmission shaft to the insulating protection module of each phase line, and a grounding static contact fixedly arranged on the supporting frame, the three-position isolating and grounding switch module includes a mounting frame fixedly connected to the supporting frame, a switch transmission shaft rotatably connected to the mounting frame, an isolating switch component fixed on the switch transmission shaft, and an isolating static contact arranged below the isolating switch component, the static end static contact, the isolating static contact and the grounding static contact of the insulating protection module are located on a cylindrical surface with the switch transmission shaft as the axis, the switch transmission shaft drives the isolating switch component to rotate with the switch transmission shaft as the axis, and the isolating switch component is used to respectively connect or disconnect the static end static contact, the isolating static contact and the grounding static contact of the insulating protection module of each phase line of the three phases, the moving end of the insulating protection module is fixedly connected to the power connection copper bar, and the isolating static contact is fixedly connected to the load connection copper bar.

[0011] Furthermore, the isolating switch component includes an isolating knife sleeve and an isolating switch movable knife arranged inside the isolating knife sleeve, and the isolating knife sleeve and the isolating switch movable knife are both in an arc shape, and the middle part of the isolating knife sleeve is fixedly connected to the switch transmission shaft.

[0012] Furthermore, the transmission chamber is provided with a main switch operating mechanism and a three-position isolating and grounding switch operating mechanism, the main switch operating mechanism is transmission-connected to the main transmission shaft, and the three-position isolating and grounding switch operating mechanism is transmission-connected to the switch transmission shaft.

[0013] Furthermore, the transmission chamber is also provided with an observation window for observing the status of the isolating switch components.

[0014] Furthermore, an instrument room is provided on the top of the transmission room, a current transformer is provided at the bottom of the load connection terminal, a control unit, and a display screen and a wireless communication unit electrically connected to the control unit are provided in the instrument room, and the control unit collects the detection signal of the current transformer and sends the detection signal to the display screen and to the background server or mobile terminal through the communication unit in real time.

[0015] Furthermore, the fixing seat is provided with a cable chamber, a cabinet door is provided at the front end of the cable chamber, and a second pressure release device is provided inside the cable chamber.

[0016] The beneficial effects of the present invention are as follows: a connecting copper rod is used between the switch assembly and the load connection terminal, and the connection terminal adopts an apron design to wrap the connecting copper rod, which can increase the insulation distance from the connecting copper rod to the shell and the phase line, effectively improving the insulation performance. The switch room is fully enclosed and filled with dry air or nitrogen as an insulating medium, which improves the security of safe operation. In addition, the switch assembly includes a main switch module using a vacuum arc extinguishing type and a three-position isolating and grounding switch module using a double-break knife switch type, which effectively improves the insulation performance and safety and reliability of the switch assembly. The three-position isolating and grounding switch module integrates the functions of an isolating switch and a grounding switch at the same time, which can make the switch assembly structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 It is a structural schematic diagram of the connecting copper rod of the present invention;

[0021] Figure 4 It is a stereoscopic view of a preferred embodiment of the present invention;

[0022] Figure 5 It is a front view of a preferred embodiment of the present invention;

[0023] Figure 6 is a schematic structural diagram of a switch assembly of the present invention;

[0024] Figure 7 It is a schematic diagram of the isolation and grounding switch opening of the three-station isolation grounding switch module of the present invention;

[0025] Figure 8 It is a schematic diagram of closing the isolating switch of the three-station isolating grounding switch module of the present invention;

[0026] Fig. 9 It is a schematic diagram of closing the grounding switch of the three-station isolating grounding switch module of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention more clear, the concept, specific structure and technical effects of the present invention will be clearly and completely described below in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] Reference Figures 1 to 5 , which is a preferred embodiment, an insulating switchgear comprises a fixing base 1, and a switch room 2, a transmission room 3 and an instrument room 4 arranged on the top of the fixing base 1;

[0029] The switch room 2 includes a shell 21, and a switch assembly 22, a power connection terminal 23 and a load connection terminal 24 arranged on the shell 21. The shell 21 adopts a fully enclosed structure. The interior of the shell 21 adopts dry air or nitrogen as an insulating medium to ensure the insulation performance of the switch assembly 22. The switch assembly 22 is respectively provided with a power connection copper bar 225 and a load connection copper bar 226 on the upper and lower sides. The power connection copper bar 225 is fixedly connected to the power connection terminal 23, and the load connection copper bar 226 is fixedly connected to the load connection terminal 24 through the connecting copper rod 25. An apron 241 is provided on the top of the load connection terminal 24, and the apron 241 is provided with a groove to facilitate the installation of the connecting copper rod 25. The apron 241 on the top of the load connection terminal 24 covers the connecting copper rod 25 therein, which can increase the insulation distance between the connecting copper rod 25 and the shell 21 and the phase line, and improve the insulation performance, that is, one end of the connecting copper rod 25 is set in the groove of the apron 241, and the other end is connected to the load connection copper bus 226. One end of the power connection terminal 23 and one end of the load connection terminal 24 both extend out of the shell 21; the transmission chamber 3 is transmission connected to the switch assembly 22.

[0030] Preferably, an instrument room 4 is also provided on the top of the transmission room 3, a current transformer 26 is provided at the bottom of the load connection terminal 24, a control unit 42, and a display screen and a wireless communication unit electrically connected to the control unit 42 are provided on the instrument room 4, the control unit 42 collects the detection signal of the current transformer 26, and sends the detection signal to the display screen and to the background server or mobile terminal through the communication unit in real time, and a control panel is also provided at the front end of the instrument room 4.

[0031] Preferably, the fixing seat 1 is provided with a cable chamber 5, a cabinet door 11 is provided at the front end of the cable chamber 5, a second pressure release device 12 is provided inside the cable chamber 5, and the cable chamber 5 is also filled with dry air or nitrogen as an insulating medium, thereby improving the insulation performance inside the cable chamber 5.

[0032] Preferably, the connecting copper rod 25 is in a shape of a middle bend, and can be reasonably installed and laid out to increase the insulation distance between the housing 21 and the B phase, thereby improving the insulation performance.

[0033] Preferably, a first pressure release device 27 is provided at the bottom of the housing 21, which can release the internal air pressure of the housing 21 during maintenance or inspection to ensure the reliability of safe operation. In addition, in order to directly determine the state of the gas density inside the housing 21, the transmission chamber 3 is provided with a density meter 34 for monitoring the gas density of the housing 21, thereby preventing the user from opening the switch chamber 2 when the gas inside the housing 21 is not completely released.

[0034] Preferably, refer to Figures 6 to 9 The switch assembly 22 includes a main switch module 221 and a three-station isolating and grounding switch module 222. The main switch module 221 includes a support frame 2211, an insulating protection module 2212 arranged in the support frame 2211, a main transmission shaft 2213 rotatably connected to the front end of the support frame 2211, a transmission component 2214 for separately connecting the main transmission shaft 2213 to the insulating protection module 2212 of each phase line, and a grounding static contact 2215 fixedly arranged on the support frame 2211. The three-station isolating and grounding switch module 222 includes a mounting frame 2221 fixedly connected to the support frame 2211, a switch transmission shaft 2222 rotatably connected to the mounting frame 2221, and an isolating switch component 222 fixed on the switch transmission shaft 2222. 3 and an isolating static contact 2224 arranged below the isolating switch component 2223, the static end static contact 2216, the isolating static contact 2224 and the grounding static contact 2215 of the insulating protection module 2212 are located on a cylindrical surface with the switch transmission shaft 2222 as the axis, the switch transmission shaft 2222 drives the isolating switch component 2223 to rotate with the switch transmission shaft 2222 as the axis, and the isolating switch component 2223 is used to respectively connect or disconnect the static end static contact 2216, the isolating static contact 2224 and the grounding static contact 2215 of the insulating protection module 2212 of each phase line of the three-phase, the moving end of the insulating protection module 2212 is fixedly connected to the power connection copper bus 225, and the isolating static contact 2224 is fixedly connected to the load connection copper bus 226.

[0035] The main switch module 221 adopts a vacuum arc extinguishing method, which is safer and more reliable; the three-position isolation and grounding switch module 222 adopts a double-break knife-type three-position switch, which improves the insulation performance and integrates the functions of the isolation switch and the grounding switch, making the structure of the three-position isolation and grounding switch module 222 more compact.

[0036] The insulating protection module 2212 includes an insulating box 22121 with a U-shaped cavity inside and a vacuum arc extinguishing chamber 22122 fixed in the U-shaped cavity. The static end of the vacuum arc extinguishing chamber 22122 is fixedly connected to the static end static contact 2216 of the insulating protection module 2212, wherein the insulating box 22121 is cast by epoxy resin, and the U-shaped cavity inside it is actually a semi-cylindrical shape. The vacuum arc extinguishing chamber 22122 is wrapped inside by the U-shaped cavity, which can effectively improve the insulation performance between the three phases and further reduce the distance between the phases, so that the switch assembly 22 can be more compact. At the same time, the U-shaped cavity is used, so that the electric field can be radiated evenly along the radius direction of the semi-cylinder, so that the electric field is evenly distributed, and local discharge can be avoided, thereby improving the insulation performance. At the same time, the insulating box 22121 adopts the design of the U-shaped cavity, which can make the overall thickness uniform, thereby effectively reducing the material cost and improving the process performance.

[0037] The transmission component 2214 includes an insulating pull rod 22141, a crank 22142, a rocker arm 22143, a fixing frame 22144 and a transmission rod 22145. The crank 22142 is fixed on the main transmission shaft 2213. The moving end of the crank 22142 is hinged to one end of the insulating pull rod 22141. The other end of the insulating pull rod 22141 is hinged to one end of the rocker arm 22143. The other end of the rocker arm 22143 is hinged to one end of the transmission rod 22145, and the other end of the transmission rod 22145 is fixedly connected to the moving end of the vacuum interrupter 22122. The middle part of the rocker arm 22143 is rotatably connected to the fixing frame 22144, and the fixing frame 22144 is fixed to the top of the insulating box 22121. By rotating the main transmission shaft 2213, the crank 22142 can be driven to rotate, thereby pulling the insulating pull rod 22141 up and down. By utilizing the transmission effect, the rocker arm 22143 is shaken up and down, thereby driving the transmission rod 22145 to move up and down, thereby realizing the closing and opening functions of the vacuum interrupter 22122, that is, realizing the closing and opening functions of the main switch module 221.

[0038] Preferably, the isolating switch component 2223 includes an isolating knife sleeve and an isolating switch moving knife arranged inside the isolating knife sleeve, and the isolating knife sleeve and the isolating switch moving knife are both in an arc shape, the middle part of the isolating knife sleeve is fixedly connected to the switch drive shaft 2222, and the isolating switch moving knife is packaged in an arc-shaped insulating sleeve, which not only improves the insulation performance between the three phases, but also makes the structure more compact because the distance between the isolating switch moving knives between each phase line can be reduced.

[0039] Preferably, refer to Figure 4 , Figures 7 to 9The transmission room 3 is provided with a main switch operating mechanism 32 and a three-position isolating and grounding switch operating mechanism 33. The main switch operating mechanism 32 is in transmission connection with the main transmission shaft 2213, and the three-position isolating and grounding switch operating mechanism 33 is in transmission connection with the switch transmission shaft 2222; the main switch operating mechanism 32 performs transmission operation on the main switch module 221 in the switch room 2 to realize the closing and opening of the main switch module 221; the three-position isolating and grounding switch operating mechanism 33 performs transmission operation on the three-position isolating and grounding switch module 221 in the switch room 2 222 performs transmission operation to realize closing of the isolating switch or the grounding switch of the three-station isolating and grounding switch module 222, and opening of the isolating and / or grounding switch. Since the static end static contact 2216, the isolating static contact 2224 and the grounding static contact 2215 of the insulation protection module 2212 are located on the cylindrical surface with the switch transmission shaft 2222 as the axis, the isolating switch and the grounding switch can be in the open state at the same time, forming a double-break state, which can effectively reduce the probability of high voltage breaking through the air and improve the reliability of safe operation.

[0040] Preferably, refer to Figure 5 An operating panel 31 is also provided at the front end of the transmission chamber 3 , and an observation window 35 for observing the state of the isolating switch component 2223 is also provided in the transmission chamber 3 , and the observation window 35 is provided on the operating panel 31 .

[0041] Preferably, the fixing base 1, the switch assembly 22, the main switch operating mechanism 32, the three-station isolation grounding switch operating mechanism 33, the control unit 42 and other components are produced in a modular manner, which can improve production efficiency and reduce production costs.

[0042] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments. As long as the technical effects of the present invention are achieved by any same or similar means, they should fall within the protection scope of the present invention.

Claims

1. An insulating switchgear, characterized in that: It comprises a fixed seat (1), and a switch chamber (2) and a transmission chamber (3) arranged on the top of the fixed seat (1); The switch room (2) comprises a housing (21), and a switch assembly (22), a power connection terminal (23) and a load connection terminal (24) arranged in the housing (21). The housing (21) adopts a fully enclosed structure. Dry air or nitrogen is used as an insulating medium inside the housing (21). A power connection copper bar (225) and a load connection copper bar (226) are respectively arranged on the upper and lower sides of the switch assembly (22). The power connection copper bar (225) is fixedly connected to the power connection terminal (23), and the load connection copper bar (226) is connected to the load connection terminal (24) via a connecting copper rod (25). 4) fixed connection, the top of the load connection terminal (24) is provided with an apron (241), the apron (241) is provided with a groove, one end of the connection copper rod (25) is arranged in the groove of the apron (241), and the other end is connected to the load connection copper bar (226), one end of the power connection terminal (23) and one end of the load connection terminal (24) both extend outside the housing (21); the transmission chamber (3) is transmission-connected to the switch assembly (22); the connection copper rod (25) is in a shape with a middle bend, and a first pressure release device (27) is provided at the bottom of the housing (21).

2. The insulating switchgear according to claim 1, characterized in that: The transmission chamber (3) is provided with a density meter (34) for monitoring the gas density of the housing (21).

3. The insulating switchgear according to claim 1, characterized in that: The switch assembly (22) comprises a main switch module (221) and a three-station isolating and grounding switch module (222); the main switch module (221) comprises a support frame (2211), an insulating protection module (2212) arranged in the support frame (2211), a main transmission shaft (2213) rotatably connected to the front end of the support frame (2211), a transmission component (2214) for separately connecting the main transmission shaft (2213) to the insulating protection module (2212) of each phase line, and a grounding static contact (2215) fixedly arranged on the support frame (2211); and the three-station isolating and grounding switch module (222) comprises a mounting frame (2221) fixedly connected to the support frame (2211), a switch transmission shaft (2222) rotatably connected to the mounting frame (2221), and an isolating switch component (2224) fixed to the switch transmission shaft (2222). 3) and an isolating static contact (2224) disposed below the isolating switch component (2223); the static end static contact (2216), the isolating static contact (2224), and the grounding static contact (2215) of the insulating protection module (2212) are located on a cylindrical surface with the switch transmission shaft (2222) as the axis; the switch transmission shaft (2222) drives the isolating switch component (2223) to rotate with the switch transmission shaft (2222) as the axis; the static end static contact (2216), the isolating static contact (2224), and the grounding static contact (2215) of the insulating protection module (2212) of each phase line of the three phases are connected or disconnected in pairs by using the isolating switch component (2223); the moving end of the insulating protection module (2212) is fixedly connected to the power connection copper bar (225); and the isolating static contact (2224) is fixedly connected to the load connection copper bar (226).

4. The insulating switchgear according to claim 3, characterized in that: The isolating switch component (2223) comprises an isolating knife sleeve and an isolating switch movable knife arranged inside the isolating knife sleeve, and both the isolating knife sleeve and the isolating switch movable knife are in an arc shape, and the middle part of the isolating knife sleeve is fixedly connected to the switch transmission shaft (2222).

5. The insulating switchgear according to claim 3, characterized in that: The transmission chamber (3) is provided with a main switch operating mechanism (32) and a three-position isolating and grounding switch operating mechanism (33); the main switch operating mechanism (32) is in transmission connection with a main transmission shaft (2213); and the three-position isolating and grounding switch operating mechanism (33) is in transmission connection with a switch transmission shaft (2222).

6. The insulating switchgear according to claim 3, characterized in that: The transmission chamber (3) is also provided with an observation window (35) for observing the state of the isolating switch component (2223).

7. The insulating switchgear according to claim 1, characterized in that: An instrument room (4) is also provided on the top of the transmission room (3); a current transformer (26) is provided at the bottom of the load connection terminal (24); a control unit (42) and a display screen and a wireless communication unit electrically connected to the control unit (42) are provided on the instrument room (4); the control unit (42) collects a detection signal of the current transformer (26) and sends the detection signal to the display screen and to a background server or a mobile terminal via the communication unit in real time.

8. The insulating switchgear according to claim 1, characterized in that: The fixing seat (1) is provided with a cable chamber (5), a cabinet door (11) is provided at the front end of the cable chamber (5), and a second pressure release device (12) is provided inside the cable chamber (5).

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