Gas tank for environment-friendly gas-insulated metal-enclosed switchgear and use method

Abstract

The invention discloses a gas tank for an environment-friendly gas insulated metal-enclosed switchgear and a use method, and belongs to the field of medium-voltage switchgears, the gas tank for the environment-friendly gas insulated metal-enclosed switchgear comprises an upper gas chamber, a lower gas chamber, an upper gas chamber main loop and a lower gas chamber main loop, the upper gas chamber main loop is arranged in the upper gas chamber, and the lower gas chamber main loop is arranged in the lower gas chamber. The lower air chamber main loop is arranged in the lower air chamber, the upper air chamber is located above the lower air chamber, an upper and lower air chamber partition plate is arranged between the upper air chamber and the lower air chamber, and communication of the upper and lower air chambers is controlled through opening and closing of an upper and lower air chamber partition plate communicating hole; upper and lower connecting sleeves are arranged in the upper and lower connecting sleeve mounting holes according to phases; the outer surface of one side of the lower air chamber is provided with a plurality of lower air chamber outer conical sleeves used for connecting cables, one side of each lower air chamber outer conical sleeve extends out of the lower air chamber to be connected with the cables, the cables and the lightning arrester are connected at the same time through the lower air chamber outer conical sleeves, the front-back depth and size are reduced, and the space utilization rate is improved.

Description

Technical Field

[0001] The invention belongs to the field of medium voltage switchgear, and in particular relates to a gas box for environmentally friendly gas-insulated metal-enclosed switchgear and a use method thereof. Background Art

[0002] With the rapid development of power systems, electric energy has become an indispensable part of people's daily lives. As the main equipment of the power transmission and distribution system, gas-insulated metal-enclosed switchgear (C-GIS equipment) is the core of the future development of emerging power systems and is widely used in modern power systems. The safety, reliability, versatility and environmental protection of gas-insulated metal-enclosed switchgear are related to whether the power system can operate safely, reliably and in a green economy. At the same time, in order to meet the needs of the current power system operation, the requirements for gas-insulated metal-enclosed switchgear are increasing. At present, the structure of gas-insulated metal-enclosed switchgear is complex, the size is large, and it is not convenient to use;

[0003] In the development trend of modern power systems, a small-sized GIS device can reduce the equipment footprint and the equipment investment cost. However, most gas boxes have a single interface, which is inconvenient to connect and difficult to meet the connection needs of multiple devices. They have poor versatility and the structural design is not dense enough, resulting in a large size. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear and a method of using the same.

[0005] The present invention adopts the following technical solution.

[0006] The first aspect of the present invention discloses a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear, comprising: an upper gas chamber, a lower gas chamber, an upper gas chamber main circuit and a lower gas chamber main circuit, wherein the upper gas chamber main circuit is arranged in the upper gas chamber, and the lower gas chamber main circuit is arranged in the lower gas chamber, the upper gas chamber is located above the lower gas chamber, and an upper and lower gas chamber partition is arranged between the upper and lower gas chambers, and upper and lower gas chamber partition communication holes are arranged on the upper and lower gas chamber partitions, and the communication of the upper and lower gas chambers is controlled by opening and closing the upper and lower gas chamber partition communication holes, and a plurality of upper and lower connecting sleeve installation holes are also arranged on the upper and lower gas chamber partitions, and the upper and lower connecting sleeve installation holes are arranged with upper and lower connecting sleeves according to phases;

[0007] At the same time, multiple lower air chamber outer conical casings for connecting cables are installed on the outer surface of one side of the lower air chamber. One side of the lower air chamber outer conical casing extends out of the lower air chamber to be connected to the cable, and then multiple cables and lightning arresters are connected at the same time through the lower air chamber outer conical casing, thereby reducing the front and rear depth dimensions and improving space utilization.

[0008] Preferably, the upper air chamber main circuit includes: a side expansion bushing, a main busbar, a three-position isolating grounding switch branch busbar and a three-position isolating grounding switch, wherein the lower end of the three-position isolating grounding switch is connected to the upper and lower connecting bushings of the corresponding phase and the upper end is connected to the three-position isolating grounding switch branch busbar of the corresponding phase.

[0009] Preferably, the upper part of the branch busbar of the three-position isolating and grounding switch is connected to the main busbar of the corresponding phase, and the two ends of the main busbar are connected to the side expansion bushings of the corresponding phase.

[0010] Preferably, the lower air chamber main circuit includes: a branch busbar on the vacuum arc chamber and a vacuum arc chamber, the upper part of the branch busbar on the vacuum arc chamber is connected to the upper and lower connecting sleeves of the corresponding phase, the lower end of the branch busbar on the vacuum arc chamber is connected to the vacuum arc chamber of the corresponding phase, and a three-phase vacuum arc chamber static contact terminal is arranged at the end of the vacuum arc chamber, and the three-phase vacuum arc chamber static contact terminal and the lower air chamber inner cone sleeve branch busbar of the corresponding phase are connected to the lower air chamber outer cone sleeve branch busbar.

[0011] Preferably, one end of the lower air chamber inner cone casing branch busbar is connected to the lower air chamber inner cone casing of the corresponding phase, and one end of the lower air chamber outer cone casing branch busbar is connected to the lower air chamber outer cone casing of the corresponding phase.

[0012] Preferably, a three-phase vacuum interrupter moving contact terminal is provided on the upper side of the vacuum interrupter, and the three-phase vacuum interrupter moving contact terminal is connected to the lower end of the upper branch busbar of the vacuum interrupter of the corresponding phase.

[0013] Preferably, the bottom plate of the lower air chamber is installed with an explosion-proof pressure relief device, which is used to release the internal pressure of the air chamber to the pressure relief channel in time when the pressure value in the air chamber exceeds the design pressure, so as to ensure the safety of operating personnel and equipment.

[0014] Preferably, a three-position isolating and grounding switch operating mechanism is arranged on the outer surface of one side of the upper air chamber, a vacuum arc extinguishing chamber operating mechanism is arranged on the outer surface of one side of the lower air chamber, and an upper end plate radiator is arranged on the upper outer surface of the upper air chamber for heat dissipation.

[0015] The second aspect of the present invention discloses a method for using a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear. Based on the gas box for an environmentally friendly gas-insulated metal-enclosed switchgear, the method comprises the following steps:

[0016] The device is connected to different equipment through the side expansion sleeves on both sides;

[0017] The outer cone casing of the lower gas chamber is connected to the external cable and lightning arrester;

[0018] The cone bushing in the lower air chamber is connected to a voltage transformer or a lightning arrester;

[0019] The upper air chamber and the lower air chamber form a complete circuit.

[0020] Preferably, the upper air chamber and the lower air chamber form a complete circuit, including:

[0021] The side expansion bushing is connected to the three-position isolating and grounding switch through the main busbar and the three-position isolating and grounding switch branch busbar in turn;

[0022] The three-position isolating grounding switch is connected to the vacuum interrupter of the lower gas chamber through upper and lower connecting bushings;

[0023] The end of the vacuum interrupter is connected to the branch busbar of the outer cone bushing of the lower gas chamber through the static contact terminal of the three-phase vacuum interrupter, and the branch busbar of the outer cone bushing of the lower gas chamber is connected to the external cable and the arrester through the outer cone bushing of the lower gas chamber to form a complete circuit;

[0024] The end of the vacuum interrupter is connected through the three-phase vacuum interrupter static contact terminal and the lower air chamber inner cone bushing branch busbar, and the lower air chamber inner cone bushing branch busbar is connected through the lower air chamber inner cone bushing and the voltage transformer or lightning arrester to form a complete circuit.

[0025] The beneficial effect of the present invention is that, compared with the prior art, the present invention arranges the outer cone sleeve of the lower gas chamber at the front end of the lower gas chamber, so that the cable is located at the front end of the equipment for connection, thereby reducing the front and rear depth dimensions of the equipment, optimizing the design of the gas box structure, rationalizing the spatial layout, making the cable interface front-mounted, and reducing the distance between the outer cone sleeve of the lower gas chamber and the front and rear plates of the lower gas chamber, thereby reducing the space size of the gas-insulated metal-enclosed switchgear and facilitating the operation of the staff;

[0026] At the same time, the present invention provides an interface for connecting the line voltage transformer by arranging a lower air chamber inner cone bushing for connecting the voltage transformer at the bottom of the lower air chamber, which can better solve the dilemma that small-sized equipment cannot be connected to the line voltage transformer;

[0027] The present invention designs upper and lower air chamber partition connecting holes on the upper and lower air chamber partitions, so that the air box can control the connection of the upper and lower air chamber partition connecting holes according to needs, thereby controlling the device to be a single air box single air chamber structure or a single air box double air chamber structure.

[0028] The present invention further reduces the depth of the equipment and the floor space on the basis of existing product technology. At the same time, a single air chamber or a double air chamber can be selected according to usage requirements, which brings better choices for engineering applications, has good economic benefits, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a side sectional view of a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear of the present invention;

[0030] Figure 2This is a structural diagram of a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear of the present invention;

[0031] Figure 3 It is a structural diagram of the main busbar and the branch busbar of the three-position isolating grounding switch of the present invention;

[0032] Figure 4 It is a structural diagram of the upper and lower air chamber baffles of the present invention;

[0033] Figure 5 It is a structural diagram of the upper branch busbar of the vacuum interrupter of the present invention;

[0034] Figure 6 is a structural diagram of the vacuum interrupter of the present invention;

[0035] Figure 7 It is a structural diagram of the cone sleeve branch busbar in the lower air chamber of the present invention;

[0036] Figure 8 It is a structural diagram of the cone sleeve in the lower air chamber of the present invention;

[0037] Fig. 9 It is a structural diagram of the outer cone casing of the lower air chamber of the present invention;

[0038] Fig.10 It is a structural diagram of the lower air chamber outer cone casing branch busbar of the present invention;

[0039] In the figure: 1. Upper end plate radiator; 2. Side expansion bushing; 3. Main busbar; 3.1. A-phase main busbar; 3.2. B-phase main busbar; 3.3. C-phase main busbar; 4. Three-position isolating grounding switch branch busbar; 4.1. Three-position isolating grounding switch A-phase upper branch busbar; 4.2. Three-position isolating grounding switch B-phase upper branch busbar; 4.3. Three-position isolating grounding switch C-phase upper branch busbar; 5. Three-position isolating grounding switch; 6. Upper and lower connecting bushings; 7. Upper and lower air chamber partitions; 7.1. Upper and lower air chamber partitions are connected Hole; 7.2, upper and lower connecting sleeve installation hole; 7.3, desiccant box fixing stud; 8, vacuum interrupter upper branch busbar; 8.1, A phase vacuum interrupter upper branch busbar; 8.2, B phase vacuum interrupter upper branch busbar; 8.3, C phase vacuum interrupter upper branch busbar; 9, vacuum interrupter; 9.1, A phase vacuum interrupter moving contact terminal; 9.2, B phase vacuum interrupter moving contact terminal; 9.3, C phase vacuum interrupter moving contact terminal; 9.4, A phase vacuum interrupter static contact terminal; 9.5 , B-phase vacuum interrupter static contact terminal; 9.6, C-phase vacuum interrupter static contact terminal; 10, rear end plate heat sink; 11, lower air chamber cone bushing branch busbar; 11.1, lower air chamber A-phase inner cone bushing branch busbar; 11.2, lower air chamber B-phase inner cone bushing branch busbar; 11.3, lower air chamber C-phase inner cone bushing branch busbar; 12, lower air chamber cone bushing; 12.1, lower air chamber A-phase inner cone bushing; 12.2, lower air chamber B-phase inner cone bushing; 12.3, lower air chamber C-phase inner cone bushing; 13, explosion-proof Pressure relief device; 14. Outer cone bushing of lower gas chamber; 14.1. Outer cone bushing of phase A of lower gas chamber; 14.2. Outer cone bushing of phase B of lower gas chamber; 14.3. Outer cone bushing of phase C of lower gas chamber; 15. Branch busbar of outer cone bushing of lower gas chamber; 15.1. Branch busbar of outer cone bushing of phase A of lower gas chamber; 15.2. Branch busbar of outer cone bushing of phase B of lower gas chamber; 15.3. Branch busbar of outer cone bushing of phase C of lower gas chamber; 16. Operating mechanism of vacuum interrupter chamber; 17. Operating mechanism of three-position isolating and grounding switch; 18. Upper gas chamber; 19. Lower gas chamber. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0041] like Figure 1-10As shown, embodiment 1 of the present invention discloses a gas box for environmentally friendly gas-insulated metal-enclosed switchgear and a method of using the same. The device comprises: an upper gas chamber 18, a lower gas chamber 19, an upper gas chamber main circuit and a lower gas chamber main circuit, wherein the upper gas chamber main circuit is arranged in the upper gas chamber 18, and the lower gas chamber main circuit is arranged in the lower gas chamber 19. The upper gas chamber 18 is located above the lower gas chamber 19, and an upper and lower gas chamber partition 7 is arranged between the upper and lower gas chambers. At the same time, an upper and lower gas chamber partition connecting hole 7.1 is arranged on the upper and lower gas chamber partition 7, which is used to control the connection between the upper and lower gas chambers, thereby controlling the gas box to be a single gas box single gas chamber structure or a single gas box double gas chamber structure;

[0042] In another specific embodiment, the upper and lower air chamber partition communication holes 7.1 are not provided on the upper and lower air chamber partitions 7, so that a single air box double air chamber structure is realized, which is convenient for the staff to select the air box type according to the needs;

[0043] Three upper and lower connecting sleeve mounting holes 7.2 are arranged on the same axis on the upper and lower air chamber partitions 7, and an upper and lower connecting sleeve 6 is installed on each of the upper and lower connecting sleeve mounting holes 7.2. The three upper and lower connecting sleeves 6 are used to facilitate the setting of the three-phase circuit. At the same time, a plurality of desiccant box fixing studs 7.3 are symmetrically arranged on both sides of the upper surface of the upper and lower air chamber partitions 7 for connecting and fixing with the dryer box.

[0044] The upper air chamber main circuit includes: a side expansion sleeve 2, a main busbar 3, a three-position isolating grounding switch branch busbar 4 and a three-position isolating grounding switch 5. The three-position isolating grounding switch 5 is provided with three-phase isolating grounding switches A, B and C. The lower end of the three-position isolating grounding switch 5 is connected to the upper and lower connecting sleeves 6 of the corresponding phase and the upper end is connected to the three-position isolating grounding switch branch busbar 4 of the corresponding phase. The upper part of the three-position isolating grounding switch branch busbar 4 is connected to the main busbar 3 of the corresponding phase, and both ends of the main busbar 3 are connected to the side expansion sleeve 2 of the corresponding phase. The three-position isolating grounding switch 5 is used to connect or isolate the load from the main circuit through three different states, and to provide grounding for the cable end.

[0045] like Figure 1 , Figure 2 and Figure 3As shown, the three-position isolating grounding switch branch busbar 4 includes: a three-position isolating grounding switch A-phase upper branch busbar 4.1, a three-position isolating grounding switch B-phase upper branch busbar 4.2 and a three-position isolating grounding switch C-phase upper branch busbar 4.3; the main busbar 3 includes: an A-phase main busbar 3.1; a B-phase main busbar 3.2 and a C-phase main busbar 3.3; the lower end of the three-position isolating grounding switch A-phase upper branch busbar 4.1 is connected to the A-phase of the three-position isolating grounding switch 5 and the upper end is connected to the A-phase main busbar 3.1, the lower end of the three-position isolating grounding switch B-phase upper branch busbar 4.2 is connected to the B-phase of the three-position isolating grounding switch 5 and the upper end is connected to the B-phase main busbar 3.2, the lower end of the three-position isolating grounding switch C-phase upper branch busbar 4.3 is connected to the C-phase of the three-position isolating grounding switch 5 and the upper end is connected to the C-phase main busbar 3.3;

[0046] At the same time, the left and right ends of the main busbar 3 are connected to the side expansion sleeve 2, and the main busbar 3 is connected to the connector of the corresponding equipment through the side expansion busbar 2 to achieve interconnection with other functional interval equipment;

[0047] The main circuit of the lower air chamber includes: a branch busbar 8 on the vacuum interrupter and a vacuum interrupter 9. The upper end of the branch busbar 8 on the vacuum interrupter is connected to the upper and lower connecting sleeves 6 of the corresponding phase to form a circuit. The lower end of the branch busbar 8 on the vacuum interrupter is connected to the vacuum interrupter moving contact terminal of the vacuum interrupter 9 of the corresponding phase. The vacuum interrupter 9 is used to close and disconnect the load current and fault current and provide a complete grounding circuit when performing grounding operations on the load side.

[0048] like Figure 1 and Figure 5 As shown, the upper branch busbar 8 of the vacuum interrupter chamber includes: an upper branch busbar 8.1 of the A-phase vacuum interrupter chamber, an upper branch busbar 8.2 of the B-phase vacuum interrupter chamber, and an upper branch busbar 8.3 of the C-phase vacuum interrupter chamber. The upper end of the vacuum interrupter chamber 9 is provided with a moving contact terminal 9.1 of the A-phase vacuum interrupter chamber, a moving contact terminal 9.2 of the B-phase vacuum interrupter chamber, and a moving contact terminal 9.3 of the C-phase vacuum interrupter chamber. The upper end of the upper branch busbar 8.1 of the A-phase vacuum interrupter chamber is connected to the A phase of the upper and lower connecting sleeves 6, and the lower end is connected to The moving contact terminal 9.1 of the A-phase vacuum interrupter is connected, the upper end of the upper branch busbar 8.2 of the B-phase vacuum interrupter is connected to the B phase of the upper and lower connecting bushings 6, and the lower end is connected to the moving contact terminal 9.2 of the B-phase vacuum interrupter, the upper end of the upper branch busbar 8.3 of the C-phase vacuum interrupter is connected to the C phase of the upper and lower connecting bushings 6, and the lower end is connected to the moving contact terminal 9.3 of the C-phase vacuum interrupter, and all the moving contact terminals of the vacuum interrupters are provided with outer cone insulating bushings for connecting cables and lightning arresters;

[0049] At the same time, a three-phase vacuum arc chamber static contact terminal is also arranged at the end of the vacuum arc chamber 9, and the three-phase vacuum arc chamber static contact terminal is connected to the lower air chamber inner cone bushing branch busbar 11 and the lower air chamber outer cone bushing branch busbar 15 of the corresponding phase, one end of the lower air chamber inner cone bushing branch busbar 11 is connected to the lower air chamber outer cone bushing 12 of the corresponding phase, and one end of the lower air chamber outer cone bushing branch busbar 15 is connected to the lower air chamber outer cone bushing 14 of the corresponding phase, and all the vacuum arc chamber static contact terminals are also provided with inner cone insulating bushings for extending the connection of voltage transformers or lightning arresters to achieve function expansion.

[0050] Three lower air chamber outer cone sleeves 14 for connecting cables are installed on one side of the bottom of the lower air chamber 19. The left side of the lower air chamber outer cone sleeve 14 extends out of the outer surface of the lower air chamber 19 and can be connected to the cable. According to different lower air chamber outer cone sleeves 14 and cable terminals, one or two groups of cables and lightning arresters can be selected for connection. The right side of the lower air chamber outer cone sleeve 14 is connected to the lower air chamber outer cone sleeve branch busbar 15 in the lower air chamber 19, and one end of the upper part of the lower air chamber outer cone sleeve branch busbar 15 is connected to the vacuum arc chamber static contact terminal of the corresponding phase of the vacuum arc chamber 9. One side end face of the vacuum arc chamber 9 is provided with A-phase vacuum arc chamber static contact terminal 9.4, B-phase vacuum arc chamber static contact terminal 9.5 and C-phase vacuum arc chamber static contact terminal 9.6.

[0051] The lower air chamber outer cone casing 14 comprises: a lower air chamber A phase outer cone casing 14.1, a lower air chamber B phase outer cone casing 14.2 and a lower air chamber C phase outer cone casing 14.3, and the lower air chamber outer cone casing branch busbar 15 comprises: a lower air chamber A phase outer cone casing branch busbar 15.1, a lower air chamber B phase outer cone casing branch busbar 15.2 and a lower air chamber C phase outer cone casing branch busbar 15.3, wherein the lower air chamber A phase outer cone casing branch busbar 15.1 and the lower air chamber A phase outer cone casing branch busbar 15.3 are connected. The phase outer cone bushing 14.1 is connected and the upper end is connected to the A phase vacuum interrupter static contact terminal 9.4, the lower end of the lower air chamber B phase outer cone bushing branch busbar 15.2 is connected to the lower air chamber B phase outer cone bushing 14.2 and the upper end is connected to the B phase vacuum interrupter static contact terminal 9.5, the lower end of the lower air chamber C phase outer cone bushing branch busbar 15.3 is connected to the lower air chamber C phase outer cone bushing 14.3 and the upper end is connected to the C phase vacuum interrupter static contact terminal 9.6.

[0052] like Figure 1 and Figure 8 As shown, a plurality of lower air chamber inner conical bushings 12 connected to a voltage transformer or a lightning arrester are installed on the inner surface of the bottom plate of the lower air chamber 19, the upper ends of the lower air chamber inner conical bushings 12 are connected to the lower air chamber inner conical bushing branch busbar 11, and the upper ends of the lower air chamber inner conical bushing branch busbar 11 are connected to the vacuum interrupter static contact terminal of the corresponding phase on the vacuum interrupter 9.

[0053] The lower air chamber cone sleeve branch busbar 11 comprises: a lower air chamber A phase inner cone sleeve branch busbar 11.1; a lower air chamber B phase inner cone sleeve branch busbar 11.2 and a lower air chamber C phase inner cone sleeve branch busbar 11.3; the lower air chamber cone sleeve 12 comprises: a lower air chamber A phase inner cone sleeve 12.1, a lower air chamber B phase inner cone sleeve 12.2 and; a lower air chamber C phase inner cone sleeve 12.3, the upper end of the lower air chamber A phase inner cone sleeve branch busbar 11.1 and the A phase vacuum extinguisher The arc chamber static contact terminal 9.4 is connected and the lower end is connected to the lower air chamber A phase inner cone bushing 12.1, the lower air chamber B phase inner cone bushing branch busbar 11.2 has an upper end connected to the B phase vacuum arc chamber static contact terminal 9.5 and the lower end is connected to the lower air chamber B phase inner cone bushing 12.2, the lower air chamber C phase inner cone bushing branch busbar 11.3 has an upper end connected to the C phase vacuum arc chamber static contact terminal 9.6 and the lower end is connected to the lower air chamber C phase inner cone bushing 12.3.

[0054] A three-position isolating and grounding switch operating mechanism 17 is arranged on the front upper outer surface of the upper air chamber 18 of the device, a vacuum arc extinguishing chamber operating mechanism 16 is arranged on the front lower outer surface of the lower air chamber 19, and an upper end plate radiator 1 is arranged on the upper outer surface of the upper air chamber 18 for heat dissipation.

[0055] like Figure 1 As shown, the outer surface of the bottom plate of the lower air chamber 19 is equipped with an explosion-proof pressure relief device 13, which is used to release the internal pressure of the air chamber to the pressure relief channel in time when the pressure value in the air chamber exceeds the design pressure, so as to ensure the safety of the operating personnel and equipment.

[0056] Preferably, a comb-shaped end plate radiator 1 is provided on the outer side of the upper end plate of the upper air chamber. Whether to configure the end plate radiator 1 can be selected according to the current carrying capacity of the main bus 3 to enhance the heat radiation heat transfer effect and efficiently control the temperature rise of the conductor.

[0057] Preferably, the device is operated by opening and closing the grounding switch of the three-position isolating grounding switch 5 to achieve the effect of isolation or grounding;

[0058] Preferably, the device realizes the opening and closing operation of the vacuum interrupter 9 by moving the three-phase vacuum interrupter moving contact terminal of the vacuum interrupter 9 forward and backward, so as to play the role of conducting and disconnecting the circuit.

[0059] Embodiment 2 of the present invention discloses a method for using a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear, comprising the following steps:

[0060] Step 1: Connect the device to different equipment through the side expansion sleeves 2 arranged on both sides;

[0061] Step 2: Connect the outer cone casing 14 of the lower gas chamber to the cable and the lightning arrester;

[0062] Step 3: The cone bushing 12 in the lower air chamber is connected to a voltage transformer or a lightning arrester;

[0063] Step 4: The upper air chamber 18 and the lower air chamber 19 form a complete circuit;

[0064] Step 4.1: The side expansion bushing 2 is connected to the three-position isolating and grounding switch 5 through the main busbar 3 and the three-position isolating and grounding switch branch busbar 4 in sequence;

[0065] Step 4.2: The three-position isolating and grounding switch 5 is connected to the vacuum interrupter 9 of the lower air chamber 19 through the upper and lower connecting sleeves 6;

[0066] Step 4.3: The end of the vacuum interrupter 9 is connected to the lower gas chamber outer cone bushing branch busbar 15 through the three-phase vacuum interrupter static contact terminal, and the lower gas chamber outer cone bushing branch busbar 15 is connected to the external cable and lightning arrester through the lower gas chamber outer cone bushing 14 to form a complete circuit;

[0067] Step 4.4: The end of the vacuum interrupter 9 is connected to the lower air chamber inner cone bushing branch bus 11 through the three-phase vacuum interrupter static contact terminal, and the lower air chamber inner cone bushing branch bus 11 is connected to the voltage transformer or lightning arrester through the lower air chamber inner cone bushing 12 to form a complete circuit.

[0068] The beneficial effect of the present invention is that, compared with the prior art, the present invention arranges the outer cone sleeve of the lower gas chamber at the front end of the lower gas chamber, so that the cable is located at the front end of the equipment for connection, thereby reducing the front and rear depth dimensions of the equipment, optimizing the design of the gas box structure, rationalizing the spatial layout, making the cable interface front-mounted, and reducing the distance between the outer cone sleeve of the lower gas chamber and the front and rear plates of the lower gas chamber, thereby reducing the space size of the gas-insulated metal-enclosed switchgear and facilitating the operation of the staff;

[0069] At the same time, the present invention provides an interface for connecting the line voltage transformer by arranging a lower air chamber inner cone bushing for connecting the voltage transformer at the bottom of the lower air chamber, which can better solve the dilemma that small-sized equipment cannot be connected to the line voltage transformer;

[0070] The present invention designs upper and lower air chamber partition connecting holes on the upper and lower air chamber partitions, so that the air box can control the connection of the upper and lower air chamber partition connecting holes according to needs, thereby controlling the device to be a single air box single air chamber structure or a single air box double air chamber structure.

[0071] The present invention further reduces the depth of the equipment and the floor space on the basis of existing product technology. At the same time, a single air chamber or a double air chamber can be selected according to usage requirements, which brings better choices for engineering applications, has good economic benefits, and has broad application prospects.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A gas box for environmentally friendly gas-insulated metal-enclosed switchgear, comprising: The upper air chamber (18), the lower air chamber (19), the upper air chamber main circuit and the lower air chamber main circuit are characterized by: The upper air chamber main circuit is arranged in the upper air chamber (18), and the lower air chamber main circuit is arranged in the lower air chamber (19). The upper air chamber (18) is located above the lower air chamber (19), and an upper and lower air chamber partition (7) is arranged between the upper and lower air chamber partitions (7). The upper and lower air chamber partitions (7) are provided with upper and lower air chamber partition communication holes (7.1). The communication between the upper and lower air chambers is controlled by opening and closing the upper and lower air chamber partition communication holes (7.1). The upper and lower air chamber partitions (7) are also provided with a plurality of upper and lower connecting sleeve mounting holes (7.2), and the upper and lower connecting sleeve mounting holes (7.2) are provided with upper and lower connecting sleeves (6) in phase. At the same time, a plurality of lower air chamber outer cone sleeves (14) for connecting cables are installed on the outer surface of one side of the lower air chamber (19), and one side of the lower air chamber outer cone sleeve (14) extends out of the lower air chamber (19) to be connected with the cable, thereby connecting a plurality of cables and lightning arresters simultaneously through the lower air chamber outer cone sleeve (14), thereby reducing the front-to-back depth dimension and improving space utilization.

2. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: The upper air chamber main circuit comprises: a side expansion bushing (2), a main busbar (3), a three-position isolating grounding switch branch busbar (4) and a three-position isolating grounding switch (5), wherein the lower end of the three-position isolating grounding switch (5) is connected to the upper and lower connecting bushings (6) of the corresponding phase, and the upper end is connected to the three-position isolating grounding switch branch busbar (4) of the corresponding phase.

3. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 2, characterized in that: The upper part of the three-station isolating grounding switch branch busbar (4) is connected to the main busbar (3) of the corresponding phase, and the two ends of the main busbar (3) are connected to the side expansion sleeve (2) of the corresponding phase.

4. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: The lower air chamber main circuit comprises: a vacuum interrupter upper branch busbar (8) and a vacuum interrupter (9); the upper part of the vacuum interrupter upper branch busbar (8) is connected to the upper and lower connecting bushings (6) of the corresponding phase; the lower end of the vacuum interrupter upper branch busbar (8) is connected to the vacuum interrupter (9) of the corresponding phase; a three-phase vacuum interrupter static contact terminal is arranged at the end of the vacuum interrupter (9); the three-phase vacuum interrupter static contact terminal is connected to the lower air chamber cone bushing branch busbar (11) of the corresponding phase and the lower air chamber cone bushing branch busbar (15) of the corresponding phase.

5. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 4, characterized in that: One end of the lower air chamber inner cone casing branch busbar (11) is connected to the lower air chamber inner cone casing (12) of the corresponding phase, and one end of the lower air chamber outer cone casing branch busbar (15) is connected to the lower air chamber outer cone casing (14) of the corresponding phase.

6. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 4, characterized in that: A three-phase vacuum interrupter moving contact terminal is arranged on the upper side of the vacuum interrupter (9), and the three-phase vacuum interrupter moving contact terminal is connected to the lower end of the upper branch busbar (8) of the vacuum interrupter of the corresponding phase.

7. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: The bottom plate of the lower air chamber (19) is installed with an explosion-proof pressure relief device (13), which is used to release the internal pressure of the air chamber to the pressure relief channel in time when the pressure value in the air chamber exceeds the design pressure, so as to ensure the safety of operating personnel and equipment.

8. The gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: A three-position isolating grounding switch operating mechanism (17) is arranged on one side outer surface of the upper air chamber (18), a vacuum arc extinguishing chamber operating mechanism (16) is arranged on one side outer surface of the lower air chamber (19), and an upper end plate radiator (1) is arranged on the upper side outer surface of the upper air chamber (18) for heat dissipation.

9. A method for using a gas box for an environmentally friendly gas-insulated metal-enclosed switchgear, based on the gas box for an environmentally friendly gas-insulated metal-enclosed switchgear according to any one of claims 1 to 8, characterized in that: The device is connected to different equipment via the side expansion sleeves (2) on both sides; The lower gas chamber outer cone casing (14) is externally connected to a cable and a lightning arrester; The cone bushing (12) in the lower air chamber is connected to a voltage transformer or a lightning arrester; The upper air chamber (18) and the lower air chamber (19) form a complete circuit.

10. The method for using a gas box for environmentally friendly gas-insulated metal-enclosed switchgear according to claim 9, characterized in that: The upper air chamber (18) and the lower air chamber (19) form a complete circuit, comprising: The side expansion sleeve (2) is connected to the three-position isolating grounding switch (5) through the main busbar (3) and the three-position isolating grounding switch branch busbar (4) in sequence; The three-position isolating grounding switch (5) is connected to the vacuum arc extinguishing chamber (9) of the lower air chamber (19) through upper and lower connecting sleeves (6); The end of the vacuum interrupter (9) is connected to the lower gas chamber outer cone bushing branch busbar (15) through the three-phase vacuum interrupter static contact terminal, and the lower gas chamber outer cone bushing branch busbar (15) is connected to the external cable and lightning arrester through the lower gas chamber outer cone bushing (14) to form a complete circuit; The end of the vacuum interrupter (9) is connected to the lower air chamber inner cone bushing branch busbar (11) through the three-phase vacuum interrupter static contact terminal, and the lower air chamber inner cone bushing branch busbar (11) is connected to the voltage transformer or lightning arrester through the lower air chamber inner cone bushing (12) to form a complete circuit.

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