40.5 kV contact box device with enhanced insulating property and air-insulated switchgear

Abstract

The utility model discloses a 40.5 kV contact box device with enhanced insulation performance and an air insulation switch device, the 40.5 kV contact box device comprises a contact box, a bus and a static contact, the static contact is arranged in the contact box, one end of the bus is inserted into the contact box and is electrically connected with the static contact; a first shielding layer and a second shielding layer are arranged in the wall body of the contact box, the first shielding layer and the second shielding layer are respectively of a cylindrical structure, the first shielding layer is located on the inner side of the second shielding layer, the first shielding layer is electrically connected with the bus and / or the static contact, and the second shielding layer is electrically connected with the live display. A capacitance induction unit is formed between the first shielding layer and the second shielding layer, and voltage signals of a main loop where the bus and the static contact are located are inductively output to the live display. The contact box provided by the utility model is integrated with the capacitive sensing unit and has a capacitive voltage dividing function, so that the air insulated switchgear does not need to install an electrified display sensor in a compartment, and the insulation of a tubular branch bus is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of switchgear, in particular to a 40.5kV contact box device and an air-insulated switchgear with enhanced insulation performance. Background Art

[0002] 40.5kV air-insulated high-voltage switchgear is developing in the direction of miniaturization, with the width of the switchgear reduced to a minimum of 1200mm. Composite insulation structure design is widely used in such equipment. The contact box is an important type of insulating component installed in the switchgear, which is used to connect the live conductors between different compartments to ensure the continuity of the live conductors. The contact box is prone to insulation and temperature rise problems during long-term operation. For example, strong partial discharge inside the contact box and heat accumulation from the conductor inside the contact box will accelerate the aging and failure of the insulation.

[0003] In order to facilitate the operation and maintenance of the switch cabinet to monitor the live state of the main circuit, prevent misoperation of electrical equipment, and protect life and property safety, it is necessary to arrange a live display sensor in the busbar room or cable room to monitor the live state of the main circuit and output a live display. However, if a tubular branch bus is used in the switch cabinet, the following problems will occur: installing a live display sensor will damage the insulation of the branch bus; the space size is limited, especially in the busbar room, it is very difficult to install a live display sensor. Utility Model Content

[0004] The utility model mainly aims at the technical problem of difficulty in installing a live display sensor in a compartment (busbar compartment or cable compartment) of a switch cabinet in the prior art, and provides a 40.5kV contact box device and an air-insulated switchgear with enhanced insulation performance.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a 40.5kV contact box device with enhanced insulation performance, including a contact box, a branch bus and a static contact, the static contact is arranged in the contact box, one end of the branch bus is inserted into the contact box and electrically connected to the static contact; a first shielding layer and a second shielding layer are provided in the wall of the contact box, the first shielding layer and the second shielding layer are respectively cylindrical structures, and the first shielding layer is located on the inner side of the second shielding layer, the first shielding layer is electrically connected to the branch bus and / or the static contact, and the second shielding layer is electrically connected to the live display, so that a capacitive sensing unit is formed between the first shielding layer and the second shielding layer, and the voltage signal of the main circuit where the branch bus and the static contact are located is sensed and output to the live display.

[0006] Furthermore, the second shielding layer is connected to a wiring tap, which extends outwardly in the radial direction of the wall of the contact box, and the second shielding layer is electrically connected to the energized display through the wiring tap and the wire connected thereto.

[0007] Furthermore, there are multiple wiring taps, which are distributed along the circumference of the second shielding layer, and the second shielding layer is electrically connected to the powered display through one of the wiring taps and the wire connected thereto.

[0008] Furthermore, a mounting flange is provided on the outer wall of the contact box at the position of the wiring tap, and the wiring tap extends to the mounting flange; and a plurality of first metal inserts for installation and fixation are provided on the mounting flange.

[0009] Furthermore, a circle of bosses is provided on the inner wall surface of the contact box, and one end of the branch bus is inserted into the inner hole formed by the boss; the boss is provided with a plurality of second metal inserts for connecting and fixing the branch bus, and the first shielding layer is connected to a conductive part extending into the contact box, and the conductive part is connected to the second metal insert, so that the first shielding layer is electrically connected to the branch bus through the conductive part and the second metal insert.

[0010] Furthermore, the boss is provided with a heat dissipation hole, which is through-shaped in the axial direction of the contact box; there are multiple heat dissipation holes, which are distributed along the circumference of the boss; and the conductive member is a copper wire.

[0011] Furthermore, both ends of the contact box are respectively provided with axially through openings, one end of the branch bus is inserted into the contact box from the opening at one end of the contact box, and the static contact is installed into the contact box from the opening at the other end of the contact box; the outer wall surface of the contact box is provided with a first skirt at the other end of the contact box, and the outer wall surface of the contact box is provided with a second skirt near one end of the contact box; one end of the contact box is provided with a lead baffle, the lead baffle semi-encloses the branch bus, and the opening direction of the lead baffle is away from the other end of the contact box; the outer wall surface of the lead baffle is provided with a third skirt.

[0012] Furthermore, the first shielding layer and the second shielding layer are respectively mesh structures, and the first shielding layer, the second shielding layer and the contact box are fixed together by insert injection molding.

[0013] Furthermore, the first shielding layer is provided with a plurality of supporting portions, and the plurality of supporting portions are distributed along the circumference of the first shielding layer.

[0014] The utility model further provides an air-insulated switchgear, comprising the 40.5kV contact box device with enhanced insulation performance as described in the utility model.

[0015] Furthermore, it comprises a busbar chamber, in which three 40.5kV contact box devices with enhanced insulation performance are installed, and the three contact boxes are arranged in parallel in the horizontal direction, and the other ends of the three branch busbars are staggered in pairs.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. Since the first shielding layer and the second shielding layer are provided in the wall of the contact box, the first shielding layer and the second shielding layer are respectively tubular structures, and the first shielding layer is located inside the second shielding layer, the first shielding layer is electrically connected to the branch bus and / or the static contact, and the second shielding layer is electrically connected to the live display, so that a capacitive sensing unit is formed between the first shielding layer and the second shielding layer, and the voltage signal of the main circuit where the branch bus and the static contact are located is sensed and output to the live display, so that the contact box of the utility model integrates a capacitive sensing unit and has a capacitive voltage dividing function, so that the air-insulated switchgear does not need to install an electric display sensor in the compartment, overcomes the difficulty of installing an electric display sensor in a compartment with limited space, and also prevents the insulation of the tubular branch bus from being damaged. In addition, the first shielding layer is electrically connected to the branch bus and / or the static contact, so that a high potential is pressed into the contact box with a higher dielectric constant than air, thereby skipping the weak air domain between the high-voltage conductor and the inner wall of the contact box, and also improving the electric field distribution inside and outside the contact box.

[0018] 2. There are multiple wiring taps, and the multiple wiring taps are distributed along the circumference of the second shielding layer, so that the utility model can use the multiple wiring taps to provide strength support during the injection molding process of the second shielding layer and the contact box insert, and prevent the second shielding layer from being impacted and deformed by the plastic liquid during the injection molding process. Similarly, the multiple support parts set on the first shielding layer can also provide strength support for the first shielding layer during the injection molding process, and prevent the first shielding layer from being impacted and deformed by the plastic liquid.

[0019] 3. The boss is provided with heat dissipation holes, which can enhance the convection heat exchange in the front and rear parts of the contact box and reduce the temperature rise there.

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the utility model of a 40.5kV contact box device with enhanced insulation performance and an air-insulated switchgear are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the air-insulated switchgear of the utility model;

[0022] Figure 2 It is an axonometric view of the contact box of the utility model;

[0023] Figure 3It is a front view of the contact box of the utility model;

[0024] Figure 4 It is a left side view of the contact box of the utility model;

[0025] Figure 5 It is a right side view of the contact box of the utility model;

[0026] Figure 6 It is a cross-sectional view of the contact box of the utility model;

[0027] Figure 7 It is an axonometric view of each metal insert and two shielding layers of the utility model;

[0028] In the figure, 1, contact box, 11, mounting flange, 12, boss, 121, heat dissipation hole, 13, lead baffle, 131, third skirt, 14, first skirt, 15, second skirt, 2, branch bus, 3, static contact, 4, first shielding layer, 41, supporting part, 5, second shielding layer, 51, wiring tap, 6, first metal insert, 7, second metal insert, 8, copper wire, 9, cabinet, 91, circuit breaker chamber, 92, branch bus chamber, 93, cable chamber. DETAILED DESCRIPTION

[0029] In the present utility model, the terms "first", "second", etc. are only used to distinguish similar objects, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. In the description, the directions or positional relationships indicated by "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model, rather than indicating or implying that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] In addition, in the description of the present invention, unless otherwise specified, "plurality" refers to two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] See also Figure 1-Figure 7 As shown, a 40.5kV contact box device with enhanced insulation performance of the utility model comprises a contact box 1, a branch busbar 2 and a static contact 3, wherein the static contact 3 is arranged in the contact box 1, and the branch busbar 2 is specifically a copper busbar, one end of which is inserted into the contact box 1 and is electrically connected to the static contact 3. Specifically, both ends of the contact box 1 are respectively provided with axially through openings, one end of the branch busbar 2 is inserted into the contact box 1 from the opening at one end of the contact box 1, and the static contact 3 is installed into the contact box 1 from the opening at the other end of the contact box 1. A first shielding layer 4 and a second shielding layer 5 are provided in the wall of the contact box 1. The first shielding layer 4 and the second shielding layer 5 are respectively cylindrical structures, and the first shielding layer 4 and the second shielding are coaxially arranged. The first shielding layer 4 is located on the inner side of the second shielding layer 5. The first shielding layer 4 is electrically connected to the branch bus 2 and / or the static contact 3, and the second shielding layer 5 is electrically connected to the live display (not shown in the figure), so that a capacitive sensing unit is formed between the first shielding layer 4 and the second shielding layer 5, and the voltage signal of the main circuit where the branch bus 2 and the static contact 3 are located is sensed and output to the live display.

[0032] In this embodiment, the first shielding layer 4 and the second shielding layer 5 are respectively mesh structures, and the first shielding layer 4, the second shielding layer 5 and the contact box 1 are fixed together by insert injection molding. The material of the contact box 1 is preferably epoxy resin.

[0033] The second shielding layer 5 is connected to a wiring tap 51, which extends outward in the radial direction of the wall of the contact box 1. The second shielding layer 5 is electrically connected to the energized display through the wiring tap 51 and the wire connected thereto. There are multiple wiring taps 51, which are distributed along the circumference of the second shielding layer 5, and each wiring tap 51 is approximately located in the middle of the second shielding layer 5 in the axial direction. The utility model can use multiple wiring taps 51 to provide strength support during the insert injection molding process of the second shielding layer 5 and the contact box 1, so as to prevent the second shielding layer 5 from being deformed by the impact of the plastic liquid during the injection molding process. Similarly, the first shielding layer 4 is provided with multiple support portions 41 distributed along its axial direction, and the multiple support portions 41 can provide strength support for the first shielding layer 4 during the injection molding process, so as to prevent the first shielding layer 4 from being deformed by the impact of the plastic liquid. Each support portion 41 is approximately located in the middle of the first shielding layer 4 in the axial direction, and is approximately triangular in shape, such as Figure 6 shown.

[0034] In this embodiment, a mounting flange 11 is provided on the outer wall of the contact box 1 at the position of the wiring tap 51 for mounting and fixing the contact box 1. The mounting flange 11 is approximately located in the middle of the outer wall of the contact box 1, and a plurality of first metal inserts 6 for mounting and fixing are provided on the mounting flange 11. The first metal inserts 6 are tubular and are used to fit the screw or bolt assembly to mount and fix the contact box 1. The wiring tap 51 extends to the mounting flange 11, and there are four wiring taps 51. The mounting flange 11 is square, and the four wiring taps 51 are respectively located in the middle of the four sides of the mounting flange 11, such as Figure 2 , Figure 3 The second shielding layer 5 is electrically connected to the powered display through one of the wiring taps 51 and the wires connected thereto.

[0035] like Figure 4 , Figure 5 As shown, a circle of bosses 12 are provided on the inner wall surface of the contact box 1, and one end of the branch busbar 2 is inserted into the inner hole formed by the bosses 12; the bosses 12 are provided with a plurality of second metal inserts 7 for connecting and fixing the branch busbar 2, and the plurality of second metal inserts 7 are distributed along the circumference of the bosses 12, and the second metal inserts 7 are tubular, and are used to connect and cooperate with the branch busbar 2 clamps that clamp the branch busbar 2 to connect and fix the branch busbar 2. The first shielding layer 4 is connected to a conductive member extending into the contact box 1, and the conductive member is connected to the second metal insert 7, so that the first shielding layer 4 is electrically connected to the branch busbar 2 through the conductive member and the second metal insert 7. The conductive member is specifically a copper wire 8, but is not limited thereto.

[0036] like Figure 4 , Figure 5As shown, the boss 12 is provided with a heat dissipation hole 121, which is through-shaped in the axial direction of the contact box 1, and can enhance the convective heat exchange of the front and rear parts of the contact box 1, and reduce the temperature rise there. There are multiple heat dissipation holes 121, and the multiple heat dissipation holes 121 are distributed along the circumference of the boss 12. Each heat dissipation hole 121 is waist-shaped, but not limited to this. In other embodiments, each heat dissipation hole 121 is a circular hole, etc.

[0037] In this embodiment, the outer wall surface of the contact box 1 is provided with a first skirt 14 at the other end of the contact box 1, and the outer wall surface of the contact box 1 is provided with a second skirt 15 near one end of the contact box 1. The first skirt 14 is a full circle type, and the second skirt 15 is a half circle type, and is located in the upper half of the outer wall surface of the contact box 1. One end of the contact box 1 is provided with a lead baffle 13 extending upward, and the lead baffle 13 is semi-enclosed to the branch bus 2, and the open direction of the lead baffle 13 is away from the other end of the contact box 1. The outer wall surface of the lead baffle 13 is provided with a third skirt 131. The arrangement of the first skirt 14, the second skirt 15, and the third skirt 131 can increase the creepage distance.

[0038] The utility model is a 40.5kV contact box device with enhanced insulation performance. Its first shielding layer 4 realizes the high potential to be pressed into the epoxy resin with a higher dielectric constant than air, thereby skipping the weak air domain between the high-voltage conductor and the inner wall of the contact box 1, and also improving the electric field distribution inside and outside the contact box 1. One of the wiring taps 51 of the second shielding layer 5 is connected to the live display, so that a capacitive sensing unit is formed between the first shielding layer 4 and the second shielding layer 5, which can sense and output the voltage signal of the main circuit where the branch bus 2 and the static contact 3 are located to the live display. Therefore, the contact box 1 of the utility model integrates a capacitive voltage division function, so that the air-insulated switchgear does not need to install a live display sensor in its compartment, thereby overcoming the difficulty of installing a live display sensor in a compartment with limited space, and avoiding damage to the insulation of the tubular branch bus.

[0039] When the utility model does not need to monitor the live state of the main circuit, the wiring tap 51 can also be disconnected from the live display, and one of the wiring taps 51 can be connected to the ground through the shell of the switch device. At this time, the second shielding layer 5 is at zero potential, and the electric field around the outer wall of the contact box 1 is more uniform.

[0040] See also Figure 1-Figure 7As shown, an air-insulated switchgear of the utility model comprises a cabinet 9 and the 40.5kV contact box device with enhanced insulation performance of the utility model. A circuit breaker chamber 91, a busbar chamber 92 and a cable chamber 93 are arranged in the cabinet 9. There are four 40.5kV contact box devices with enhanced insulation performance, wherein the contact boxes 1 of three contact box devices are horizontally mounted in parallel on the first partition wall between the busbar chamber 92 and the circuit breaker chamber 91, and the contact box 1 of another contact box device is mounted on the second partition wall between the cable chamber 93 and the circuit breaker chamber 91. The three contact box devices located in the busbar chamber 92 have a total of three branch busbars 2, and the other ends of the three branch busbars 2 are staggered in pairs, as shown in FIG. Figure 1 As shown, a triangular arrangement is formed, so that after the main busbars of different specifications are installed, the insulation distances between phases and relative to the ground are greater than 300 mm.

[0041] The utility model discloses an air-insulated switchgear, which uses a double-shielded contact box, designs the shape and size of the shielding net, connects the shielding net inside and outside the contact box, and is used as a capacitive sensing unit, without installing a pillar-shaped live display sensor in a busbar room or a cable room, and does not affect the electric field distribution and insulation in the compartment.

[0042] The utility model is an air-insulated switchgear. Regarding the structure and working principle of the 40.5kV contact box device with enhanced insulation performance, please refer to the above description part thereof, which will not be repeated here.

[0043] The utility model provides a 40.5kV contact box device and air-insulated switchgear with enhanced insulation performance, and the uninvolved parts are the same as the prior art or can be implemented by using the prior art.

[0044] The above embodiments are only used to further illustrate a 40.5kV contact box device and air-insulated switchgear with enhanced insulation performance of the utility model, but the utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model fall within the protection scope of the technical solution of the utility model.

Claims

1. A 40.5kV contact box device with enhanced insulation performance, comprising a contact box, a branch bus and a static contact, wherein the static contact is arranged in the contact box, one end of the branch bus is inserted into the contact box and electrically connected to the static contact; characterized in that: A first shielding layer and a second shielding layer are provided in the wall of the contact box, the first shielding layer and the second shielding layer are respectively cylindrical structures, and the first shielding layer is located on the inner side of the second shielding layer, the first shielding layer is electrically connected to the branch bus and / or the static contact, and the second shielding layer is electrically connected to the live display, so that a capacitive sensing unit is formed between the first shielding layer and the second shielding layer, and the voltage signal of the main circuit where the branch bus and the static contact are located is sensed and output to the live display.

2. The 40.5 kV contact box device with enhanced insulation performance according to claim 1, characterized in that: The second shielding layer is connected to a wiring tap, which extends outwardly in the radial direction of the wall of the contact box. The second shielding layer is electrically connected to the live display through the wiring tap and the wire connected thereto.

3. The 40.5 kV contact box device with enhanced insulation performance according to claim 2, characterized in that: There are multiple wiring taps, and the multiple wiring taps are distributed along the circumference of the second shielding layer. The second shielding layer is electrically connected to the powered display through at least one wiring tap and the wire connected thereto.

4. The 40.5 kV contact box device with enhanced insulation performance according to claim 2 or 3, characterized in that: A mounting flange is provided on the outer wall of the contact box at the position of the wiring tap, and the wiring tap extends to the mounting flange; a plurality of first metal inserts for mounting and fixing are provided on the mounting flange.

5. The 40.5 kV contact box device with enhanced insulation performance according to claim 1, characterized in that: A circle of bosses is provided on the inner wall surface of the contact box, and one end of the branch bus is inserted into the inner hole formed by the boss; the boss is provided with a plurality of second metal inserts for connecting and fixing the branch bus, and the first shielding layer is connected to a conductive part extending into the contact box, and the conductive part is connected to the second metal insert, so that the first shielding layer is electrically connected to the branch bus through the conductive part and the second metal insert.

6. The 40.5 kV contact box device with enhanced insulation performance according to claim 5, characterized in that: The boss is provided with a heat dissipation hole, which is through-shaped in the axial direction of the contact box; there are multiple heat dissipation holes, which are distributed along the circumference of the boss; and the conductive member is a copper wire.

7. The 40.5 kV contact box device with enhanced insulation performance according to claim 1, characterized in that: The two ends of the contact box are respectively provided with axially through openings, one end of the branch bus is inserted into the contact box from the opening at one end of the contact box, and the static contact is installed into the contact box from the opening at the other end of the contact box; the outer wall surface of the contact box is provided with a first skirt at the other end of the contact box, and the outer wall surface of the contact box is provided with a second skirt near one end of the contact box; one end of the contact box is provided with a lead baffle, the lead baffle semi-encloses the branch bus, and the opening direction of the lead baffle is away from the other end of the contact box; the outer wall surface of the lead baffle is provided with a third skirt.

8. The 40.5 kV contact box device with enhanced insulation performance according to any one of claims 1 to 3, characterized in that: The first shielding layer and the second shielding layer are respectively mesh structures, and the first shielding layer, the second shielding layer and the contact box are fixed together by insert injection molding; The first shielding layer is provided with a plurality of supporting portions, and the plurality of supporting portions are distributed along the circumference of the first shielding layer.

9. An air-insulated switchgear, characterized in that: A 40.5 kV contact box device with enhanced insulation performance comprising the method according to any one of claims 1 to 8.

10. The air-insulated switchgear according to claim 9, characterized in that: It comprises a busbar chamber, in which three 40.5kV contact box devices with enhanced insulation performance are installed, and the three contact boxes are arranged in parallel in the horizontal direction, and the other ends of the three branch busbars are staggered in pairs.

Images