Air insulation structure of 10KV high-voltage cabinet

Abstract

The utility model discloses an air insulation structure of a 10KV high-voltage cabinet in the technical field of high-voltage cabinet insulation, which comprises a vacuum circuit breaker, the vacuum circuit breaker is arranged in a cabinet body, an A-phase wire inlet end of the vacuum circuit breaker is connected with an A-phase wire inlet switching bar, a C-phase wire inlet end of the vacuum circuit breaker is connected with a C-phase wire inlet switching bar, and the A-phase wire inlet end of the vacuum circuit breaker is connected with the C-phase wire inlet switching bar. The A-phase incoming line switching bar, the C-phase incoming line switching bar and the B-phase incoming line end of the circuit breaker are respectively connected with an incoming line branch busbar, the A-phase outgoing line end of the vacuum circuit breaker is connected with the A-phase outgoing line switching bar, and the C-phase outgoing line end of the vacuum circuit breaker is connected with the C-phase outgoing line switching bar. And the A-phase outgoing line switching bar, the C-phase outgoing line switching bar and the B-phase outgoing line end of the circuit breaker are respectively connected with an outgoing line branch busbar. The air insulation requirement is met, an SMC insulation plate is omitted, and the problem that the insulation performance is reduced due to aging of the outlet SMC insulation plate is solved.

Description

Technical Field

[0001] This utility model relates to the air insulation structure of a 10KV high-voltage switchgear in the field of high-voltage switchgear insulation technology. Background Technology

[0002] The existing design scheme for a 10kV 650mm wide high-voltage switchgear includes a 150mm phase distance between vacuum circuit breakers, current transformers, and grounding switches. The branch copper busbars are 40mm wide, resulting in an air insulation distance of 110mm between phases, which fails to meet the national requirement of 125mm. Therefore, a composite insulation method is needed, adding 5mm thick SMC insulation boards between phases in the busbar compartment and cable compartment to solve this problem. However, the insulation boards age rapidly, reducing insulation performance. In humid environments, the reliability of the insulation will also decrease, leading to low safety performance. The equipment requires regular inspection and replacement of the insulation boards, increasing maintenance costs (e.g., ...). Figure 1 ). Utility Model Content

[0003] The purpose of this invention is to provide an air insulation structure for a 10KV high-voltage switchgear that can meet the requirement of an air insulation spacing of 125mm without the need for SMC insulation boards.

[0004] To achieve the above objectives, this utility model provides an air-insulated structure for a 10kV high-voltage switchgear, including a vacuum circuit breaker. The vacuum circuit breaker is installed inside the switchgear. The A-phase incoming terminal of the vacuum circuit breaker is connected to the A-phase incoming transfer busbar, and the C-phase incoming terminal of the vacuum circuit breaker is connected to the C-phase incoming transfer busbar. The A-phase incoming transfer busbar, the C-phase incoming transfer busbar, and the B-phase incoming terminal of the circuit breaker are each connected to an incoming branch busbar. The A-phase outgoing terminal of the vacuum circuit breaker is connected to the A-phase outgoing transfer busbar, and the C-phase outgoing terminal of the vacuum circuit breaker is connected to the C-phase outgoing transfer busbar. The A-phase outgoing transfer busbar, the C-phase outgoing transfer busbar, and the B-phase outgoing terminal of the circuit breaker are each connected to an outgoing branch busbar.

[0005] Compared with the prior art, the beneficial effects of this utility model are that by expanding the air insulation distance between the incoming branch busbars of phase A and phase B, and between phase C and phase B, through the A-phase incoming transfer busbar and the C-phase incoming transfer busbar, and by expanding the air insulation distance between the outgoing branch busbars of phase A and phase B, and between phase C and phase B, through the A-phase outgoing transfer busbar and the C-phase outgoing transfer busbar, the air insulation distance can be met in all cases, thus satisfying the air insulation requirements. Moreover, it eliminates the need for SMC insulation boards, avoiding the problem of reduced insulation performance due to aging of the outgoing SMC insulation boards.

[0006] As a further improvement of this utility model, the A-phase incoming line adapter includes an A-phase incoming line long row, the lower end of which is connected to the outer end of the A-phase incoming line short row. The C-phase incoming line adapter includes a C-phase incoming line long row, the lower end of which is connected to the outer end of the C-phase incoming line short row. The A-phase incoming line adapter and the C-phase incoming line adapter are symmetrical to each other, wherein the inner end of the A-phase incoming line short row and the inner end of the C-phase incoming line short row are directly opposite each other. The upper ends of the A-phase incoming line long row and the C-phase incoming line long row are respectively connected to an incoming line branch busbar.

[0007] In this way, the A-phase incoming line transfer busbar and the C-phase incoming line transfer busbar are processed into an L-shape and are symmetrical to each other. This moves the position of the long incoming line busbar closer to both sides of the cabinet, increasing the distance between the long incoming line busbars. This also increases the spacing between the connected incoming line branch busbars, thereby increasing the air insulation spacing between the incoming line branch busbars.

[0008] As a further improvement of this utility model, the A-phase outgoing line transition bus includes an A-phase outgoing line long bus, the upper end of which is connected to the outer end of the A-phase outgoing line short bus. The C-phase outgoing line transition bus includes a C-phase outgoing line long bus, the upper end of which is connected to the outer end of the C-phase outgoing line short bus. The A-phase outgoing line transition bus and the C-phase outgoing line transition bus are symmetrical to each other, wherein the inner end of the A-phase outgoing line short bus and the inner end of the C-phase outgoing line short bus are directly opposite each other. The lower ends of the A-phase outgoing line long bus and the C-phase outgoing line long bus are respectively connected to an outgoing line branch bus.

[0009] In this way, the A-phase outgoing line transfer busbar and the C-phase outgoing line transfer busbar are processed into an inverted L-shape and are symmetrical to each other. This moves the position of the outgoing line long busbar closer to both sides of the cabinet, thereby increasing the distance between the outgoing line long busbars. This also increases the spacing between the outgoing line branch busbars connected to them, thereby increasing the air insulation spacing between the outgoing line branch busbars.

[0010] As a further improvement of this utility model, the width of the A-phase incoming line busbar, the C-phase incoming line busbar, and the incoming line branch busbar is 40mm, the center distance between the A-phase incoming line branch busbar and the B-phase incoming line branch busbar is 165mm, and the center distance between the C-phase incoming line branch busbar and the B-phase incoming line branch busbar is 165mm.

[0011] In this way, the phase-to-phase air gap of the incoming branch busbars of phases A and B can reach exactly 125mm, and the phase-to-phase air gap of the incoming branch busbars of phases C and B can also reach 125mm, which can meet the national standard requirements and effectively control the production and processing costs.

[0012] As a further improvement of this utility model, the width of the A-phase outgoing line long row, the C-phase outgoing line long row and the outgoing line branch busbar is 40mm, the center distance between the A-phase outgoing line long row and the phase branch busbar is 165mm, and the center distance between the C-phase outgoing line long row and the B-phase branch busbar is 165mm.

[0013] In this way, the phase-to-phase air gap of the outgoing branch busbars of phases A and B can reach exactly 125mm, and the phase-to-phase air gap of the outgoing branch busbars of phases C and B can also reach 125mm, which can meet the national standard requirements and effectively control the production and processing costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the existing technology.

[0015] Figure 2 This is a schematic diagram of the structure of the utility model.

[0016] Figure 3 This is a schematic diagram of the incoming and outgoing line adapters of this utility model.

[0017] Among them, 1 is the incoming branch busbar, 2 is the outgoing branch busbar, 3 is the insulation board, 4 is the A-phase incoming transfer busbar, 5 is the C-phase incoming transfer busbar, 6 is the A-phase outgoing transfer busbar, 7 is the C-phase outgoing transfer busbar, 8 is the A-phase incoming long busbar, 9 is the C-phase incoming long busbar, 10 is the C-phase incoming short busbar, 11 is the A-phase incoming short busbar, 12 is the C-phase outgoing short busbar, 13 is the A-phase outgoing short busbar, 14 is the C-phase outgoing long busbar, and 15 is the A-phase outgoing long busbar. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] like Figure 2-3 The air insulation structure of a 10kV high-voltage switchgear shown includes a vacuum circuit breaker, which is installed inside the cabinet. The A-phase incoming terminal of the vacuum circuit breaker is connected to the A-phase incoming transfer busbar 4, and the C-phase incoming terminal of the vacuum circuit breaker is connected to the C-phase incoming transfer busbar 5. The A-phase incoming transfer busbar 4, the C-phase incoming transfer busbar 5, and the B-phase incoming terminal of the circuit breaker are each connected to an incoming branch busbar 1. The A-phase outgoing terminal of the vacuum circuit breaker is connected to the A-phase outgoing transfer busbar 6, and the C-phase outgoing terminal of the vacuum circuit breaker is connected to the C-phase outgoing transfer busbar 7. The A-phase outgoing transfer busbar 6, the C-phase outgoing transfer busbar 7, and the B-phase outgoing terminal of the circuit breaker are each connected to an outgoing branch busbar 2.

[0020] Phase A incoming line transition busbar 4 includes a long A-phase incoming line 8, the lower end of which is connected to the outer end of a short A-phase incoming line 11. Phase C incoming line transition busbar 5 includes a long C-phase incoming line 9, the lower end of which is connected to the outer end of a short C-phase incoming line 10. Phase A incoming line transition busbar 4 and Phase C incoming line transition busbar 5 are symmetrical to each other. The inner end of the short A-phase incoming line 11 and the inner end of the short C-phase incoming line 10 are directly opposite each other. The upper ends of the long A-phase incoming line 8 and the long C-phase incoming line 9 are respectively connected to an incoming line branch busbar 1.

[0021] Phase A outgoing line transition busbar 6 includes a long phase A outgoing line 15, the upper end of which is connected to the outer end of a short phase A outgoing line 13. Phase C outgoing line transition busbar 7 includes a long phase C outgoing line 14, the upper end of which is connected to the outer end of a short phase C outgoing line 12. Phase A outgoing line transition busbar 6 and phase C outgoing line transition busbar 7 are symmetrical to each other. The inner end of the short phase A outgoing line 13 is directly opposite to the inner end of the short phase C outgoing line 12. The lower ends of the long phase A outgoing line 15 and the long phase C outgoing line 14 are respectively connected to an outgoing line branch busbar 2.

[0022] The width of the A-phase incoming line busbar 8, the C-phase incoming line busbar 9, and the incoming line branch busbar 1 is 40mm. The center distance between the A-phase incoming line branch busbar 1 and the B-phase incoming line branch busbar is 165mm. The center distance between the C-phase incoming line branch busbar 1 and the B-phase incoming line branch busbar is 165mm.

[0023] The width of the A-phase outgoing line 15, the C-phase outgoing line 14, and the outgoing branch busbar 2 is 40mm. The center distance between the A-phase outgoing line 15 and the B-phase branch busbar 2 is 165mm. The center distance between the C-phase outgoing line 14 and the B-phase branch busbar 2 is 165mm.

[0024] In this utility model, since the phase distance of the vacuum circuit breaker is 150mm, and the A phase and C phase of the vacuum circuit breaker are located on both sides, and the B phase is located between the A phase and C phase, that is, the phase distance between the A phase and B phase and between the C phase and B phase of the vacuum circuit breaker is 150mm.

[0025] The three phases of the vacuum circuit breaker are further divided into incoming and outgoing terminals. The A-phase incoming terminal is connected to the A-phase incoming transition busbar 4, the C-phase incoming terminal is connected to the C-phase incoming transition busbar 5, and the B-phase incoming terminal is normally connected to the incoming branch busbar 1. The A-phase incoming transition busbar 4 is composed of the A-phase incoming short busbar 11 and the A-phase incoming long busbar 8, forming an L-shape. The C-phase incoming transition busbar 5 is composed of the C-phase incoming short busbar 10 and the C-phase incoming long busbar 9, also forming an L-shape. The A-phase incoming short busbar 11 and the C-phase incoming short busbar 10 are connected to the A-phase incoming terminal and the C-phase incoming terminal, respectively. With the inner ends of 0 facing each other, the center distance between the A-phase incoming line long busbar 8 and the B-phase incoming line branch busbar 1 can be increased to 165mm, and the center distance between the C-phase incoming line long busbar 9 and the B-phase incoming line branch busbar 1 can be increased to 165mm. Since the width of the A-phase incoming line long busbar 8, the C-phase incoming line long busbar 9, and the incoming line branch busbar 1 is 40mm, the air gap between the A-phase incoming line branch busbar 1 and the B-phase incoming line branch busbar 1 is 125mm, and the air gap between the C-phase incoming line branch busbar 1 and the B-phase incoming line branch busbar 1 is 125mm, which meets the national standard requirements.

[0026] The A-phase outgoing line transition busbar 6 is composed of the A-phase outgoing line short busbar 13 and the A-phase outgoing line long busbar 15, forming an inverted L shape. The C-phase outgoing line transition busbar 7 is composed of the C-phase outgoing line short busbar 12 and the C-phase outgoing line long busbar 14, also forming an inverted L shape. The A-phase outgoing line short busbar 13 and the C-phase outgoing line short busbar 12 are connected to the A-phase outgoing line end and the C-phase outgoing line end, respectively. The inner ends of the A-phase outgoing line short busbar 13 and the C-phase outgoing line short busbar 12 are opposite each other. This reduces the center distance between the A-phase outgoing line long busbar 15 and the B-phase outgoing line branch busbar. The center distance between the C-phase outgoing line busbar 14 and the B-phase outgoing line branch busbar 2 is increased to 165mm. Since the width of the A-phase outgoing line busbar 15, the C-phase outgoing line busbar 14, and the outgoing line branch busbar 2 is 40mm, the air gap between the A-phase outgoing line branch busbar 2 and the B-phase outgoing line branch busbar 2 reaches 125mm, and the air gap between the C-phase outgoing line branch busbar 2 and the B-phase outgoing line branch busbar 2 also reaches 125mm, meeting the national standard requirements.

[0027] This invention directly expands the interphase air gap between phases A and B, and between phases C and B, to 125mm by connecting corresponding transition buses to the incoming and outgoing terminals of phases A and C of the vacuum circuit breaker. This eliminates the need for additional 5mm thick SMC insulation boards 3 between phases A and B, and between phases C and B, thus meeting the air insulation requirements and avoiding safety issues caused by the aging of the SMC insulation boards 3. This improves the safety and reliability of the cabinet and reduces maintenance costs.

[0028] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. An air-insulated structure for a 10kV high-voltage switchgear, comprising a vacuum circuit breaker, wherein the vacuum circuit breaker is installed inside the switchgear, the A-phase incoming terminal of the vacuum circuit breaker is connected to an A-phase incoming transfer busbar, the C-phase incoming terminal of the vacuum circuit breaker is connected to a C-phase incoming transfer busbar, the A-phase incoming transfer busbar, the C-phase incoming transfer busbar, and the B-phase incoming terminal of the circuit breaker are each connected to an incoming branch busbar, the A-phase outgoing terminal of the vacuum circuit breaker is connected to an A-phase outgoing transfer busbar, the C-phase outgoing terminal of the vacuum circuit breaker is connected to a C-phase outgoing transfer busbar, and the A-phase outgoing transfer busbar, the C-phase outgoing transfer busbar, and the B-phase outgoing terminal of the circuit breaker are each connected to an outgoing branch busbar.

2. The air insulation structure of a 10KV high-voltage switchgear according to claim 1, characterized in that: The A-phase incoming line transition busbar includes a long A-phase incoming line, the lower end of which is connected to the outer end of a short A-phase incoming line. The C-phase incoming line transition busbar includes a long C-phase incoming line, the lower end of which is connected to the outer end of a short C-phase incoming line. The A-phase and C-phase incoming line transition busbars are symmetrical to each other, with the inner ends of the short A-phase and short C-phase incoming lines facing each other. The upper ends of the long A-phase and long C-phase incoming lines are each connected to an incoming line branch busbar.

3. The air insulation structure of a 10kV high-voltage switchgear according to claim 2, characterized in that: Phase A outgoing line transition busbar includes a long phase A outgoing line, the upper end of which is connected to the outer end of a short phase A outgoing line. Phase C outgoing line transition busbar includes a long phase C outgoing line, the upper end of which is connected to the outer end of a short phase C outgoing line. The phase A outgoing line transition busbar and the phase C outgoing line transition busbar are symmetrical to each other, with the inner ends of the short phase A outgoing line and the inner ends of the short phase C outgoing line facing each other. The lower ends of the long phase A outgoing line and the long phase C outgoing line are each connected to an outgoing line branch busbar.

4. The air insulation structure of a 10kV high-voltage switchgear according to claim 2, characterized in that: The width of the A-phase incoming line busbar, the C-phase incoming line busbar, and the incoming line branch busbar is 40mm. The center distance between the A-phase incoming line branch busbar and the B-phase incoming line branch busbar is 165mm, and the center distance between the C-phase incoming line branch busbar and the B-phase incoming line branch busbar is 165mm.

5. The air insulation structure of a 10kV high-voltage switchgear according to claim 3, characterized in that: The width of the A-phase outgoing line bar, the C-phase outgoing line bar, and the outgoing line branch busbar is 40mm. The center distance between the A-phase outgoing line bar and the phase branch busbar is 165mm, and the center distance between the C-phase outgoing line bar and the B-phase branch busbar is 165mm.

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