CN112332222A - Through type contact box - Google Patents
Through type contact box Download PDFInfo
- Publication number
- CN112332222A CN112332222A CN202011322275.9A CN202011322275A CN112332222A CN 112332222 A CN112332222 A CN 112332222A CN 202011322275 A CN202011322275 A CN 202011322275A CN 112332222 A CN112332222 A CN 112332222A
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- CN
- China
- Prior art keywords
- contact box
- box body
- polar plate
- contact
- busbar
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/14—Shutters or guards for preventing access to contacts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Patch Boards (AREA)
Abstract
The through type contact box comprises a box body, wherein an inner annular wall umbrella skirt surrounding the inner wall of the box body extends downwards from the top end inside the box body, and the thickness of the inner annular wall umbrella skirt is different from that of an outer annular wall umbrella skirt surrounding the outer wall of the box body and extending downwards from the top end outside the box body. According to the invention, the risk of surface flashover at the upper end inside the contact box is effectively avoided by arranging the inner annular wall umbrella skirt; the vertical distance between the high-voltage shielding polar plate and the grounding shielding polar plate is 35-40 mm, so that the electric field distribution at each key position of the contact box is ensured to be uniform, the highest field intensity meets the field intensity control requirement, and the electrical safety of the contact box is improved; carry out the silicon rubber shutoff to the female outlet that arranges of contact box, effectively avoided inside flashover or take place partial discharge and can endanger other air chambers that link to each other with it through the female outlet that arranges of contact box and lead to female arranging the danger of discharging to female outlet because of female arranging the slope, improved the life of contact box.
Description
Technical Field
The invention relates to the technical field of contact boxes for high-voltage switch cabinets, in particular to a through type contact box.
Background
The high-voltage switch cabinet is one of the most important devices in a power system, and has the characteristics of compact structure, small occupied space, easiness in overhauling and maintenance and the like. As the connection junction between the power grid and the user, once a fault occurs, serious consequences such as equipment damage or user power failure are possibly caused. In the field of high-voltage electrical appliances, a ring sleeve insulating part of a high-voltage switch cabinet mainly comprises a contact box, a bent partition plate, a sleeve and other elements, wherein the contact box is used as a core element in the high-voltage switch cabinet and is mainly used for supporting and fixing a fixed contact of a circuit breaker in the switch cabinet, keeping the circuit breaker insulated from a cabinet body and simultaneously having a wire inlet and outlet transition function. Therefore, the contact box is an essential element of the high-voltage switch cabinet.
At present, most of contact boxes of the existing high-voltage switch cabinet adopt a single-shielding structure, namely only one high-voltage shielding is adopted, and no grounding shielding is adopted. However, although the double-shielding structure design adopted by the current high-voltage switch cabinet contact box effectively improves the air gap field intensity inside the contact box, the partial discharge risk caused by special environmental conditions such as dirt accumulation inside the contact box can be reduced, and the safety and reliability of the operation of the contact box are improved. However, a high field intensity region is formed between the grounding shield and the high-voltage shield in the insulating part of the contact box, and the field intensities of the high-voltage shielding polar plate and the end part of the grounding shielding polar plate are relatively high. And because the distance between the upper end of the high-voltage shielding polar plate and the valve of the grounding cabinet body of the high-voltage switch cabinet is smaller, the upper end inside the contact box is subjected to surface flashover, and the safety and reliability of the operation of the contact box are influenced. Meanwhile, in order to ensure that the electric field distribution at each key position of the contact box is uniform and the highest field intensity, namely the field intensity on the surface of the grounding shield polar plate, the field intensity on the surface of the high-voltage shield polar plate and the field intensity on the surface of the insulating part of the contact box all meet the field intensity control requirement, under the condition that the covering depth of the high-voltage shield polar plate is not changed, the vertical distance between the high-voltage shield polar plate and the grounding shield polar plate needs to be reasonably set to ensure that the distance between the end part of the high-voltage shield.
At present, the contact box of the existing high-voltage switch cabinet does not seal the silicon rubber of the outlet of the contact box busbar, so that once flashover or partial discharge occurs inside the contact box, other air chambers connected with the contact box are endangered by the outlet of the contact box busbar. Meanwhile, at the busbar outlet, if the busbar is not fixed, the busbar is easy to incline due to the busbar, so that the busbar is too close to the outlet to discharge the outlet, and the insulation aging of the epoxy material of the contact box body is accelerated.
In summary, the prior art has the following technical disadvantages:
1. although the field intensity of an air gap inside the contact box is effectively reduced by adopting a double-shielding structure design of the existing high-voltage switch cabinet contact box, the distance between a high potential generated at the upper end of a high-voltage shielding polar plate and a valve of a grounding cabinet body of the high-voltage switch cabinet is smaller, so that the upper end inside the contact box is subjected to surface flashover, and the safety and reliability of the operation of the contact box are influenced;
2. the distance between the end part of a high-voltage shielding polar plate and the end part of a grounding shielding polar plate in the insulating part of the contact box of the existing high-voltage switch cabinet is unreasonable, the electric field distribution at each key position of the contact box is uniform, and the highest field intensity, namely the field intensity of the surface of the grounding shielding polar plate, the field intensity of the surface of the high-voltage shielding polar plate and the field intensity of the surface of the insulating part of the contact box, can not meet the field intensity control requirement, so that the safety and;
3. at present, the contact box of the existing high-voltage switch cabinet does not seal the silicon rubber of the outlet of the contact box busbar, and once flashover or partial discharge occurs inside the contact box, other air chambers connected with the contact box are endangered through the outlet of the contact box busbar. Meanwhile, at the busbar outlet, if the busbar is not fixed, the busbar is easy to incline due to the busbar, so that the busbar is too close to the outlet to discharge the outlet, and the insulation aging of the epoxy material of the contact box body is accelerated.
Disclosure of Invention
The through type contact box provided by the invention has the advantages of good shielding effect, reasonable structure, strong insulating property and high safety.
In order to achieve the purpose, the invention adopts the following technical scheme:
a through type contact box comprises a box body, wherein the box body is cylindrical, a busbar outlet for mounting a busbar is formed in the lower portion of the box body, and the busbar outlet is sealed by silicon rubber; a double-shielding polar plate is arranged in a solid insulating part of the box body, a high-voltage shielding polar plate of the double-shielding polar plate is connected with a metal insert in the contact box and extends to the position near an insulating hanging plate at the tail part of the contact box, and a grounding shielding polar plate of the double-shielding polar plate is respectively connected with a bolt through four metal parts and is fixed with a vertical metal partition in the switch cabinet; and an inner annular wall umbrella skirt which surrounds the inner wall of the contact box body extends downwards from the top end inside the box body, and the thickness of the inner annular wall umbrella skirt is different from that of an outer annular wall umbrella skirt which surrounds the outer wall of the box body and extends downwards from the top end outside the box body.
Preferably, the silicone rubber for plugging the busbar outlet is completely attached to the busbar outlet of the box body, and the silicone rubber central opening is completely attached to the busbar outlet of the contact box body.
Preferably, vertical distance between high pressure shielding polar plate and the ground connection shielding polar plate is 35 ~ 40mm, and through the simulation analysis and the experimental verification of electric field, the setting that reachs this distance scope makes the distance between the inside high pressure shielding polar plate tip of solid insulation and the ground connection shielding polar plate tip set up rationally, has guaranteed that each key position electric field of contact box distributes evenly and the highest field intensity promptly ground connection shielding polar plate surface field intensity, high pressure shielding polar plate surface field intensity and contact box solid insulation surface field intensity all satisfy the field intensity control requirement.
Preferably, the inner ring wall umbrella skirt is distributed inside the contact box body and surrounds the inner wall of the contact box body for a circle, the thickness of the inner ring wall umbrella skirt is 13mm, simulation analysis and experiment verification of an electric field prove that the thickness of the inner ring wall umbrella skirt does not affect the installation of a fixed upper static contact on the fixed insert for installing the internal static contact of the contact box body and the heat dissipation effect of the contact box, the sufficient creepage distance between the upper end of the high-voltage shielding polar plate and the valve of the grounding cabinet body of the high-voltage switch cabinet is ensured, the risk of surface flashover at the upper end inside the contact box is avoided, and the electrical safety is improved.
According to the technical scheme, the through-type contact box effectively avoids the risk of surface flashover at the upper end inside the contact box due to the fact that the inner annular wall umbrella skirt is additionally and reasonably arranged inside the contact box body; the vertical distance range between the high-voltage shielding polar plate and the grounding shielding polar plate is reasonably set through simulation analysis and experimental verification of the electric field, so that the electric field distribution at each key position of the contact box is effectively ensured to be uniform, the highest field intensity meets the field intensity control requirement, and the electrical safety of the contact box is improved; carry out reasonable silicon rubber shutoff to the female outlet that arranges of contact box, effectively avoided the inside flashover that appears of contact box or take place partial discharge and can endanger other air chambers that link to each other with it through the female outlet that arranges of contact box and lead to female arranging the danger of discharging to female outlet because of female arranging the slope, improved the life of contact box.
Drawings
FIG. 1 is a schematic cross-sectional view of a cartridge according to the present invention;
fig. 2 is a schematic diagram of a three-dimensional partial structure of the present invention.
In the figure: the high-voltage shielding type bus bar comprises an inner ring wall umbrella skirt 1, an outer ring wall umbrella skirt 2, a busbar 3, silicon rubber 4, a grounding shielding polar plate 5, a high-voltage shielding polar plate 6, a static contact 7, a cabinet body valve 8, a solid insulating part 9, an installation and fixation insert 10, an installation and fixation insert 11, a static contact installation and fixation insert 12, a box body 13, a busbar outlet 14 and a high-voltage shielding polar plate 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1 and 2, the through-type contact box provided by the invention comprises a contact box body 13, wherein a busbar outlet 14 for mounting a busbar 3 is formed in the lower part of the contact box body 13, and the busbar outlet 14 is sealed by silicon rubber 4; and the inside of the solid insulating part 9 of the box body 13 is provided with high-voltage shielding polar plates 6 and 15 and a grounding shielding polar plate 5; and extend the interior rampart full skirt 1 of a contact box body 13 downwards at the inside top of this box body 13, 2 thickness variation sizes that the rampart full skirt 1 and the outside top of this contact box body 13 extend downwards, the difference in thickness setting of interior rampart full skirt 1, 2 is in order to guarantee under the prerequisite of enough creepage distance, the reliable installation of static contact 7 to and guarantee the contact box radiating effect.
As shown in fig. 1 and fig. 2, as a preferred embodiment, in the specific implementation, the silicone rubber 4 for plugging the busbar outlet 14 is completely attached to the busbar outlet 14 of the contact box body 13, and the central opening of the silicone rubber 4 is completely attached to the busbar outlet 3 of the busbar outlet 14 of the contact box body 13. The arrangement effectively avoids the risk that flashover or partial discharge in the contact box body 13 can endanger other air chambers connected with the contact box body through the busbar outlet 14 of the contact box and the discharge of the busbar 3 to the busbar outlet 14 caused by the inclination of the busbar 3, and prolongs the service life of the contact box.
As shown in fig. 1 and fig. 2, as a preferred embodiment, in a specific implementation, a vertical distance between the high-voltage shielding pole plate 6 and the ground shielding pole plate 5 is 37mm, the high-voltage shielding pole plate 15 is connected to the breaker contact box and the busbar 3 through the fixed contact mounting insert 12, the ground shielding pole plate 5 is connected to the bolt on the fixed mounting insert 10 through four metal pieces, and the fixed mounting insert 10 and the fixed mounting insert 11 both have a function of fixing the contact box. Through simulation analysis and experimental verification of an electric field, the distance between the end part of the high-voltage shielding polar plate 6 inside the solid insulating part 9 and the end part of the grounding shielding polar plate 5 is set reasonably by obtaining the distance, and the uniform distribution and the highest field intensity of the electric field at each key position of the contact box are ensured, namely the field intensity on the surface of the grounding shielding polar plate 5, the field intensity on the surface of the high-voltage shielding polar plate 6 and the field intensity on the surface of the solid insulating part 9 of the contact box all meet the field intensity control requirement.
As shown in fig. 1 and fig. 2, as an optimal solution, in the specific implementation, the inner annular wall umbrella skirt 1 is distributed inside the contact box body 13 around the inner wall of the box body 13 for a circle, and the thickness of the inner annular wall umbrella skirt 1 is 13mm, and through simulation analysis and experimental verification of an electric field, the thickness of the inner annular wall umbrella skirt 1 does not affect the installation of the fixed contact 7 on the fixed insert 12 for installing the internal fixed contact of the contact box body 13 and the heat dissipation effect of the contact box, and the sufficient creepage distance between the upper end of the high-voltage shielding polar plate 6 and the grounding cabinet body valve 8 of the high-voltage switch cabinet is ensured, so that the risk of the surface flashover at the upper end inside the contact box is avoided, and the electrical safety is improved.
In conclusion, compared with the prior art, the inner annular wall umbrella skirt is additionally and reasonably arranged inside the box body of the contact box, so that the risk of surface flashover at the upper end inside the contact box is effectively avoided, and the electrical safety of the contact box is improved; because the vertical distance between the high-voltage shielding polar plate and the grounding shielding polar plate is reasonably set through simulation analysis and experimental verification of the electric field, the contact box effectively ensures that the electric field at each key position of the contact box is uniformly distributed and the highest field intensity meets the field intensity control requirement, and improves the electrical safety of the contact box; the reasonable silicon rubber plugging is carried out on the busbar outlet of the contact box, so that the danger that flashover or partial discharge occurs in the contact box and can endanger other air chambers connected with the contact box through the busbar outlet of the contact box and the busbar discharges the busbar outlet due to the inclination of the busbar is effectively avoided, and the service life of the contact box is prolonged.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A through type contact box comprises a box body (13), wherein a busbar outlet (14) for mounting a busbar (3) is arranged at the lower part of the box body (13), and a double-shielding polar plate is arranged inside a solid insulating part (9) of the box body (13) and comprises a high-voltage shielding polar plate and a grounding shielding polar plate (5);
the method is characterized in that:
an inner annular wall umbrella skirt (1) surrounding the inner wall of the box body (13) extends downwards from the top end of the inner part of the box body (13), and the thickness of the inner annular wall umbrella skirt (1) is different from that of an outer annular wall umbrella skirt (2) surrounding the outer wall of the box body (13) and extending downwards from the top end of the outer part of the box body (13).
2. A pass-through contact box according to claim 1, wherein: the high-voltage shielding polar plate is connected with the metal insert inside the contact box and extends to the insulating hanging plate at the tail part of the contact box;
and the grounding shielding polar plate (5) is respectively connected with the bolts through four metal pieces and is fixed with the vertical metal partition plate in the switch cabinet.
3. A pass-through contact box according to claim 2, wherein: the busbar outlet (14) is plugged by adopting silicon rubber (4).
4. A pass-through contact box according to claim 3, wherein: the silicon rubber (4) for plugging the busbar outlet (14) is completely attached to the busbar outlet (14), and the central opening of the silicon rubber (4) is completely attached to the busbar (3) of the busbar outlet (14).
5. A pass-through contact box according to claim 2, wherein: the vertical distance between the high-voltage shielding polar plate (6) and the grounding shielding polar plate (5) is 35-40 mm.
6. A pass-through contact box according to claim 1, wherein: the inner annular wall umbrella skirt (1) is distributed in the box body (13) and surrounds the inner wall of the box body (13) for a circle;
the thickness of the inner annular wall umbrella skirt (1) is 13 mm.
7. A pass-through contact box according to claim 1, wherein: the box body (13) is cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011322275.9A CN112332222A (en) | 2020-11-23 | 2020-11-23 | Through type contact box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011322275.9A CN112332222A (en) | 2020-11-23 | 2020-11-23 | Through type contact box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112332222A true CN112332222A (en) | 2021-02-05 |
Family
ID=74320960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011322275.9A Pending CN112332222A (en) | 2020-11-23 | 2020-11-23 | Through type contact box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112332222A (en) |
-
2020
- 2020-11-23 CN CN202011322275.9A patent/CN112332222A/en active Pending
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