A 40.5 kV switchgear without insulating partition

Abstract

The present application relates to a 40.5 kV switchgear without insulating partitions, wherein the busbar room and the cable room are located at the rear side of the trolley room, a circuit breaker is arranged in the trolley room, a contact box group comprises an intermediate contact box and edge contact boxes symmetrically arranged on both sides of the intermediate contact box, a vertical connecting sleeve is arranged on the intermediate contact box, and each edge contact box is provided with an inclined connecting sleeve, the inclination direction of each inclined connecting sleeve is toward the edge of the cabinet body to which each edge contact box is close, the design of the utility model makes the edge contact boxes on both sides inclined outward, thus ensuring that a minimum safe isolation distance of 300 mm is maintained between the upper ends of the intermediate contact box and the two edge contact boxes, that is, the distance between the connected upper branch busbars is maintained at 300 mm or above; the original horizontal straight line layout is transformed into an inclined improvement on a plane, and the space is reasonably arranged, so that the volume of the entire switch cabinet is further reduced and compacted while ensuring safety, thereby improving the utilization rate of the factory land.

Description

Technical Field

[0001] The present application relates to the field of switchgear, and in particular to a 40.5 kV switchgear without an insulating partition. Background Art

[0002] Switchgear is a common complete set of switchgear. At present, the domestic indoor removable medium-voltage complete set of switchgear adopts the product design concept introduced from abroad in the 1990s. The structural design tends to be conservative and the size is large.

[0003] According to IEC62271-200 "1kV~52kV AC metal-enclosed switches and control equipment";

[0004] Or according to GB / T3906 "3.6~40.5kV AC metal-enclosed switchgear and control equipment";

[0005] The electrical safety distance of 40.5kV metal enclosed switchgear is:

[0006] The net distance between conductor and ground is 300mm; the net distance between conductors of different phases is 300mm;

[0007] According to the above standards, the width of the existing general 40.5kV air switch cabinet is 1818mm. The switchgear is generally used in sets. The overall width of 10-20 devices used in sets needs to be changed urgently under the current trend of tight urban land use and compact modularization of electricity usage scenarios.

[0008] The existing compact 40.5kV switchgear switchgear has a width of 1400mm. Large interphase insulating partitions (busbar room and cable room) are added between each live body to meet the insulation strength standard requirements to reduce the interphase distance, thereby achieving the purpose of compacting the width of the switchgear. Under the actual conditions of uneven distribution room environment in my country, the insulation partition has the risk of reduced insulation strength and even failure breakdown during long-term operation under the influence of strong electric fields, dust, water vapor, etc.

[0009] Therefore, a 40.5 kV switchgear without insulating partitions is required, whose overall structural design meets the standards and whose insulation strength meets the standards and is more compact. Utility Model Content

[0010] Based on this, it is necessary to propose an air-insulated 40.5 kV switchgear without insulating partitions based on the traditional structure and size.

[0011] A 40.5 kV switchgear without an insulating partition, comprising a cabinet, wherein the cabinet is provided with a busbar chamber, a trolley chamber and a cable chamber, wherein the busbar chamber and the cable chamber are located at the rear side of the trolley chamber, wherein a circuit breaker is provided in the trolley chamber, wherein an input end of the circuit breaker is located in the busbar chamber, wherein an output end of the circuit breaker is located in the cable chamber, wherein a busbar group is provided in the busbar chamber, wherein the busbar group is connected to the circuit breaker through an upper branch busbar group;

[0012] The input and output ends of the circuit breaker are both provided with a contact box group, and the contact box group includes an intermediate contact box and edge contact boxes symmetrically arranged on both sides of the intermediate contact box. The intermediate contact box is provided with a vertical connecting sleeve, and each of the edge contact boxes is provided with an inclined connecting sleeve, and the inclination direction of each of the inclined connecting sleeves is toward the edge of the cabinet close to each edge contact box.

[0013] The busbar chamber is provided with a left partition, a lower partition, a right partition and an upper partition. The lower partition is located between the busbar chamber and the cable chamber. Two contact box groups are symmetrically arranged on the upper and lower sides of the lower partition.

[0014] Preferably, the busbar group comprises a first busbar, a second busbar and a third busbar arranged in an L shape.

[0015] Preferably, in each of the edge contact boxes, the inclined connecting sleeve comprises an inclined bottom end, an inclined tube body and an inlet end, and the inclined bottom end is connected to the interior of the edge contact box.

[0016] Preferably, an inclined connecting busbar is arranged in each of the inclined pipe bodies, a vertical connecting busbar is arranged in the vertical connecting sleeve, and the upper branch busbar group includes three upper branch busbars arranged at intervals from each other, the lower end of the inclined connecting busbar is connected to the circuit breaker, and the upper end of the inclined connecting busbar is connected to one of the upper branch busbars.

[0017] Preferably, the distance between two adjacent upper branch busbars is 300 mm or more.

[0018] Preferably, the inclination angle a of the inclined tube body is 75-8 degrees.

[0019] Preferably, the inclination angle of the inclined connecting busbar is the same as the inclination angle of the inclined pipe body.

[0020] Preferably, an insulating protection plate is also provided on the incoming line end.

[0021] Preferably, the cable room is provided with a lower branch busbar group, a current transformer and an output cable. Technical advantages of this application:

[0022] 1. First, the edge contact boxes on both sides are set to face outward, and the inclined connecting busbars inside are also set to be inclined, so that a minimum safe isolation distance of 300mm can be maintained between the middle contact box and the upper ends of the two edge contact boxes, that is, the distance between the connected upper branch busbars is maintained at 300mm or more;

[0023] 2. The bottom of the contact box group is tightly connected together, while the upper part of the edge contact box on both sides gradually extends outward. Under the condition of meeting the standard of safety isolation distance, the volume of the cabinet can be reduced, which is in line with the compact switch cabinet;

[0024] 3. An insulating protection plate is also provided on the incoming line end, which can improve the protection effect of phase-to-phase insulation and is suitable for use in conditions of high humidity or harsh site environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0026] Figure 1 This is the overall structural diagram of the 40.5 kV switchgear without insulating partitions for this application.

[0027] Figure 2 A schematic diagram of the back structure of a 40.5 kV switchgear provided in one embodiment of the present application.

[0028] Figure 3 A schematic diagram of the internal structure of a 40.5 kV switchgear provided in one embodiment of the present application.

[0029] Figure 4 It is a schematic diagram of the side connection relationship of the contact box group in one embodiment of the present application.

[0030] Figure 5 A schematic diagram of the actual layout spacing of a contact box group provided in yet another embodiment of the present application.

[0031] Figure numerals: cabinet 1; busbar room 11; left partition 111; lower partition 112; right partition 113; upper partition 114; trolley room 12; cable room 13; circuit breaker 14; input end 141; output end 142; busbar group 2; first busbar 21; second busbar 22; third busbar 23; contact box group 3; middle contact box 31; vertical connecting sleeve 311; edge contact box 32; inclined connecting sleeve 321; inclined bottom end 3211; inclined tube body 3212; incoming line end 3213; insulating protection plate 3214; upper branch busbar group 4; inclined connecting busbar 401; vertical connecting busbar 402; upper branch busbar 403; lower branch busbar group 5; current transformer 6; output cable 7. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] For the existing compact 40.5KV switchgear, taking air insulation as an example, if calculated according to the minimum safe spacing distance, the existing 1400mm, adding insulating partitions in the middle of each contact box and each upper branch busbar to improve the insulation strength, but under the actual conditions of uneven distribution room environment in my country, the insulating partitions have the risk of reduced insulation strength and even failure breakdown during long-term operation under the influence of strong electric fields, dust, water vapor, etc. Switchgear is generally arranged in multiples. When each 40.5KV switchgear can save 400mm, multiple side-by-side use can save a lot of space, which can save the user a high economic expenditure.

[0037] like Figures 1 to 5 As shown, the present application provides a 40.5 kV switchgear without insulating partitions.

[0038] In one embodiment

[0039] like Figure 1 As shown, the 40.5 kV switchgear without insulating partitions of the present application includes a cabinet 1, in which a busbar chamber 11, a trolley chamber 12 and a cable chamber 13 are arranged. The busbar chamber 11 and the cable chamber 13 are located at the rear side of the trolley chamber 12. A circuit breaker 14 is arranged in the trolley chamber 12. The input end 141 of the circuit breaker 14 is located in the busbar chamber 11, and the output end 142 of the circuit breaker 14 is located in the cable chamber 13. A busbar group 2 is arranged in the busbar chamber 11, and the busbar group 2 is connected to the circuit breaker 14 through an upper branch busbar group 4.

[0040] like Figure 2 As shown: the busbar chamber 11 is provided with a left partition 111, a lower partition 112, a right partition 113 and an upper partition 114, wherein the lower partition 112 is located between the busbar chamber 11 and the cable chamber 13, and two contact box groups 3 are symmetrically arranged on the upper and lower sides of the lower partition 112.

[0041] like Figure 3 As shown: the busbar group 2 includes a first busbar 21, a second busbar 22 and a third busbar 23 arranged in an L shape. In each of the edge contact boxes 32, the input end 141 and the output end 142 of the circuit breaker 14 are provided with a contact box group 3. The contact box group 3 includes an intermediate contact box 31 and edge contact boxes 32 symmetrically arranged on both sides of the intermediate contact box 31. The intermediate contact box 31 is provided with a vertical connecting sleeve 311, and each of the edge contact boxes 32 is provided with an inclined connecting sleeve 321. The inclined direction of each of the inclined connecting sleeves 321 is toward the edge of the cabinet 1 close to each edge contact box 32.

[0042] like Figure 4-5 As shown, the inclined connecting sleeve 321 includes an inclined bottom end 3211 , an inclined tube body 3212 and an inlet end 3213 , and the inclined bottom end 3211 is connected to the interior of the edge contact box 32 .

[0043] like Figure 3-4 Shown: Example 1

[0044] An inclined connecting busbar 401 is arranged in each inclined pipe body 3212, a vertical connecting busbar 402 is arranged in the vertical connecting sleeve 311, the upper branch busbar group 4 includes three upper branch busbars 403 arranged at intervals from each other, and a lower branch busbar group 5, a current transformer 6 and an output cable 7 are arranged in the cable chamber 13.

[0045] Each upper busbar 403 is connected to the first busbar 21, the second busbar 22 and the third busbar 23 in sequence, so that the electricity of the busbar group 2 is transmitted to the input end 141 of the circuit breaker 14, and is isolated and protected by the contact box group 3 in the middle, and then transmitted from the output end 142 of the circuit breaker 14 to the lower busbar group 5, and then transmitted to the transformer from the output cable 7.

[0046] The lower end of the inclined busbar 401 is connected to the circuit breaker 14 , and the upper end of the inclined busbar 401 is connected to one of the upper branch busbars 403 . The distance between two adjacent upper branch busbars 403 is 300 mm or more.

[0047] In order to ensure a safe air insulation isolation distance of 300 mm, the inclination angle a of the inclined tube body 3212 is 75-80 degrees, and the angle can be slightly adjusted according to the length of the inclined tube body 3212 of the edge contact box 32.

[0048] like Figure 5 As shown: In this embodiment, the inclination angle a of the inclined tube body 3212 is 78 degrees, that is, the angle between the inclined tube body 3212 and the horizontal direction, and the inclined connecting busbar 401 maintains a synchronously inclined setting in the inclined tube body 3212, and the inclination angle of the inclined connecting busbar 401 is the same as the inclination angle of the inclined tube body 3212.

[0049] In order to further improve the insulation effect between the upper branch busbars 403, as Figure 3 As shown, an insulating protection plate 3214 may also be provided on both sides of the incoming line end 3213. The insulating protection plate 3214 has two pieces, which are respectively fixed at the connection between the upper branch busbar 403 and the contact box.

[0050] like Figure 3 As shown, the existing 40.5KV switch cabinet in Example 2 is 1818mm

[0051] The 40.5KV switch cabinet is made into a 1400mm compact switch cabinet, which does not require the use of insulating partitions. The upper branch busbar connected to the upper ends of the edge contact box 32 and the middle contact box 31 is an exposed part, and a safety distance of 300mm or more needs to be maintained.

[0052] In order to maintain a safe air insulation distance: the inclination angle a of the two inclined tube bodies 3212 on both sides is 78 degrees, and they are symmetrically arranged with the vertical connecting sleeve 311 as the center.

[0053] The phase distance L10 between the left side incoming line terminal 3213 and the edge of the cabinet 1 is 310mm≥300mm;

[0054] The phase distance L30 between the right side incoming line terminal 3213 and the edge of the cabinet 1 is 310mm≥300mm;

[0055] The distance L12 between the left side inlet terminal 3213 and the vertical connection sleeve 311 is 300mm≥300mm;

[0056] The distance L23 between the right side inlet terminal 3213 and the vertical connection sleeve 311 is 300 mm ≥ 300 mm;

[0057] At the same time, the center distance of the three upper branch busbars 403 is 360mm≥350mm;

[0058] The above safety distances are all greater than or equal to the standard safety air isolation distance of 300mm. The phase spacing of L10 and L30 is much greater than 300mm, and there is still enough space, so the angle a can still be slightly adjusted, and it is not necessary to follow a symmetrical design. The width of the copper busbar is 60mm*3=180mm.

[0059] The overall cabinet width is 310mm+300mm+300mm+310mm+180mm=1400mm, which fully meets the safety index requirements of each phase of the 1400mm model 40.5kV / 1250A / 31.5KA metal-enclosed switchgear, and there is no need to add partition design.

[0060] In summary: the design of the utility model makes the edge contact boxes on both sides tilt outward, so as to ensure that the middle contact box and the upper ends of the two edge contact boxes maintain a minimum safe isolation distance of 300mm, that is, the distance between the connected upper branch busbars is maintained at 300mm and above; the original horizontal straight line layout is transformed into an inclined improvement on the plane, and the space is reasonably arranged. Under the premise of ensuring safety, the volume of the entire switch cabinet is further reduced and compact, thereby improving the utilization rate of factory land.

[0061] The technical features of the above-described embodiments may be arbitrarily combined, and the execution order of the method steps is not limited. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A 40.5 kV switchgear without an insulating partition, comprising a cabinet (1), wherein the cabinet (1) is provided with a busbar chamber (11), a trolley chamber (12) and a cable chamber (13), characterized in that: The busbar chamber (11) and the cable chamber (13) are located at the rear side of the trolley chamber (12); a circuit breaker (14) is arranged in the trolley chamber (12); an input end (141) of the circuit breaker (14) is located in the busbar chamber (11); an output end (142) of the circuit breaker (14) is located in the cable chamber (13); a busbar group (2) is arranged in the busbar chamber (11); the busbar group (2) is connected to the circuit breaker (14) via an upper branch busbar group (4); The input end (141) and the output end (142) of the circuit breaker (14) are both provided with a contact box group (3), the contact box group (3) comprising an intermediate contact box (31) and edge contact boxes (32) symmetrically arranged on both sides of the intermediate contact box (31), the intermediate contact box (31) being provided with a vertical connection sleeve (311), and each of the edge contact boxes (32) being provided with an inclined connection sleeve (321), the inclination direction of each of the inclined connection sleeves (321) being towards an edge of the cabinet (1) to which each edge contact box (32) is close.

2. The 40.5 kV switchgear without insulating partition according to claim 1, characterized in that: The busbar chamber (11) is provided with a left partition (111), a lower partition (112), a right partition (113) and an upper partition (114); the lower partition (112) is located between the busbar chamber (11) and the cable chamber (13); and the two contact box groups (3) are symmetrically arranged on the upper and lower sides of the lower partition (112).

3. The 40.5 kV switchgear without insulating partition according to claim 2, characterized in that: The busbar group (2) comprises a first busbar (21), a second busbar (22) and a third busbar (23) arranged in an L shape.

4. The 40.5 kV switchgear without insulating partition according to claim 3, characterized in that: In each of the edge contact boxes (32), the inclined connection sleeve (321) comprises an inclined bottom end (3211), an inclined tube body (3212) and an inlet end (3213), and the inclined bottom end (3211) is connected to the interior of the edge contact box (32).

5. The 40.5 kV switchgear without insulating partition according to claim 4, characterized in that: An inclined connecting busbar (401) is arranged in each inclined tube body (3212), a vertical connecting busbar (402) is arranged in the vertical connecting sleeve (311), the upper branch busbar group (4) comprises three upper branch busbars (403) arranged at intervals from each other, the lower end of the inclined connecting busbar (401) is connected to the circuit breaker (14), and the upper end of the inclined connecting busbar (401) is connected to one of the upper branch busbars (403).

6. The 40.5 kV switchgear without insulating partition according to claim 5, characterized in that: The distance between two adjacent upper branch busbars (403) is 300 mm or more.

7. The 40.5 kV switchgear without insulating partition according to claim 6, characterized in that: The inclination angle a of the inclined tube body (3212) is 75-80 degrees.

8. The 40.5 kV switchgear without insulating partition according to claim 7, characterized in that: The inclination angle of the inclined connecting busbar (401) is the same as the inclination angle of the inclined tube body (3212).

9. The 40.5 kV switchgear without insulating partition according to claim 4, characterized in that: The line inlet terminal (3213) is also provided with an insulating protection plate (3214).

10. The 40.5 kV switchgear without insulating partition according to claim 1, characterized in that: The cable chamber (13) is provided with a lower branch busbar group (5), a current transformer (6) and an output cable (7).

Images