CN214228770U - Plugging type contact box for 40.5kV high-voltage switch cabinet - Google Patents
Plugging type contact box for 40.5kV high-voltage switch cabinet Download PDFInfo
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- CN214228770U CN214228770U CN202120273447.1U CN202120273447U CN214228770U CN 214228770 U CN214228770 U CN 214228770U CN 202120273447 U CN202120273447 U CN 202120273447U CN 214228770 U CN214228770 U CN 214228770U
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Abstract
The utility model relates to a shutoff type contact box for 40.5kV high tension switchgear, including the insulating part and the double-shielded polar plate of embedding setting in the insulating part lateral wall of seting up the cavity. The double-shielding polar plate comprises a grounding shielding polar plate and a high-voltage shielding polar plate, wherein the grounding shielding polar plate is arc-shaped. An insulating protective cover is arranged at the bottom of the middle section of the insulating part. A busbar outlet is arranged at the right end of the insulating part; the insulating part at the position of the female discharge wire port comprises a first insulating part and a second insulating part, wherein the top end of the first insulating part is provided with an opening, and the second insulating part is arranged above the periphery of the opening at the top end of the first insulating part. The left end of the insulating part at the position of the female discharge line port is embedded with a metal part, and the metal part and the insulating part are integrally cast and molded. And the metal piece is provided with a static contact mounting and fixing insert and a busbar mounting and fixing insert. The contact box can solve the defects in the prior art and has the characteristics of good shielding effect, strong insulating property, reasonable structure, high operational reliability and the like.
Description
Technical Field
The utility model relates to a high tension switchgear technical field, concretely relates to shutoff type contact box for 40.5kV high tension switchgear.
Background
With the continuous development of power grids, high-voltage switch cabinets are widely applied to power systems. The high-voltage switch cabinet is a complete set of power distribution equipment which is formed by fixedly connecting devices such as a high-voltage circuit breaker, a load switch, a fuse, an isolating switch, an earthing switch, a lightning arrester, a mutual inductor, a control device, a measurement device, a protection device and the like, an internal connecting piece, an insulating supporting piece and an auxiliary piece and then installing the devices in one or more earthed metal shells by a manufacturer according to the requirement of a client on primary wiring of a high-voltage distribution line. The high-voltage switch cabinet not only reduces the occupied area and space of power equipment, but also improves the operating efficiency of the transformer substation, and has good economic benefit. In recent years, the problem of insulation failure in a high-voltage switch cabinet is increasingly prominent, and the safe and stable operation of a power system is directly influenced. The contact box is used as a core element in the high-voltage switch cabinet, and the insulation optimization of the contact box is very important.
The current 40.5kV for high tension switchgear contact box mostly all adopt single shield structure, and the internal field intensity of gaseous medium is higher relatively under this structure, and the internal field intensity of solid medium is lower relatively, because gaseous medium dielectric strength obviously is less than solid medium, consequently, under special environmental conditions such as long-pending dirt, can cause the inside risk that takes place partial discharge of contact box. Although a small part of contact boxes for the high-voltage switch cabinet adopt a double-shielding structure, the air gap field intensity inside the contact box is effectively improved, and the risk of partial discharge caused inside the contact box is reduced. However, in the existing double-shielding structure, a high field intensity region is formed between the high-voltage shielding polar plate and the grounding shielding polar plate inside the insulating part of the contact box, and particularly, the field intensities of the high-voltage shielding polar plate and the end part of the grounding shielding polar plate are relatively high and exceed the field intensity control value. In order to enable the surface field intensity of the high-voltage shielding polar plate and the grounding shielding polar plate to meet the field intensity control requirement, part of high-voltage switch cabinet manufacturers adopt a method of increasing the cover depth of the high-voltage shielding polar plate. Although the method achieves the purpose, the distance between the high-voltage shielding polar plate and the valve of the grounding cabinet body of the high-voltage switch cabinet is reduced, the risk of surface flashover exists on the inner surface of the insulating part, and the service life of the contact box is greatly influenced. In addition, the existing contact box for the 40.5kV high-voltage switch cabinet also has the problems that the surface field intensity of an insulating part cannot meet the field intensity control requirement, the internal discharge of the contact box endangers the air chambers connected with the contact box and the creepage distance of a busbar outlet is insufficient, and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a 40.5kV is shutoff type contact box for high tension switchgear, this contact box can solve exist among the prior art not enough, have that the shielding is effectual, insulating properties is strong, rational in infrastructure, characteristics such as operational reliability height.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the blocking type contact box for the 40.5kV high-voltage switch cabinet comprises an insulating part with a cavity and double-shielding polar plates embedded in the side wall of the insulating part; the double-shielding polar plate comprises a grounding shielding polar plate and a high-voltage shielding polar plate, and the grounding shielding polar plate is arc-shaped.
Further, an insulating shield is arranged at the bottom of the middle section of the insulating part; the insulating shield is U-shaped.
Furthermore, a busbar outlet is arranged at the right end of the insulating part; the insulation piece at the position of the female discharge wire port comprises a first insulation part with an opening at the top end and a second insulation part arranged above the periphery of the opening at the top end of the first insulation part; a metal piece is embedded into the left end of the insulating piece at the position of the female discharge line port; and the metal piece is provided with a static contact mounting and fixing insert and a busbar mounting and fixing insert.
Furthermore, an insulating umbrella skirt is arranged on the outer side wall of the upper end of the second insulating part.
Furthermore, an outer annular wall umbrella skirt is arranged on the outer side wall of the left end of the insulating part.
Furthermore, a contact box mounting fixing insert is arranged on the outer side wall of the middle section of the insulating part, and a bolt in the contact box mounting fixing insert is connected with the grounding shielding polar plate.
Furthermore, the high-voltage shielding polar plate is connected with the metal piece through a bolt.
Furthermore, the insulating part, the insulating shield and the metal part are integrally cast.
According to the technical scheme, the utility model discloses a design into arc structure ground connection shielding polar plate, not only increased the distance between high-pressure shielding polar plate and the ground connection shielding polar plate tip, made high-pressure shielding polar plate and ground connection shielding polar plate surface field intensity all satisfy field intensity control requirement, still avoided because of increasing high-pressure shielding polar plate cover depth and lead to between high-pressure shielding polar plate and the high-voltage switchgear grounding cabinet body valve distance reduce the risk that the insulating part internal surface that causes takes place the creeping on along the face flashover, improved the electrical safety of contact box; the insulating shield is arranged at the bottom of the insulating part, so that the highest field strength on the surface of the insulating part is reduced, the field strength control requirement is met, and the service life of the contact box is prolonged; the metal piece is arranged at the busbar outlet of the insulating piece, and the metal piece and the insulating piece are integrally cast, so that the plugging effect is achieved, and the danger that the internal discharge of the contact box endangers the air chamber connected with the contact box is eliminated; the insulating umbrella skirt is additionally arranged on the outer surface of the insulating part at the position of the busbar wire outlet, so that the creepage distance is increased, and the risk of discharging of the busbar to the insulating part is reduced. The contact box has the characteristics of good shielding effect, strong insulating property, reasonable structure, high operational reliability and the like.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic sectional structure of the present invention.
Wherein:
1. the high-voltage switch comprises an insulating part, 2, a high-voltage shielding polar plate, 3, a grounding shielding polar plate, 4, an outer annular wall umbrella skirt, 5, a metal part, 6 and a static contact mounting and fixing insert, 7, a busbar mounting and fixing insert, 8, a bolt, 9, a contact box mounting and fixing insert, 10, an insulating umbrella skirt, 11, an insulating shield, 12, a first insulating part, 13 and a second insulating part.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
the blocking type contact box for the 40.5kV high-voltage switch cabinet shown in the figures 1-2 comprises an insulating part 1 with a cavity and double-shielding polar plates embedded in the side wall of the insulating part 1. The double-shielding polar plate comprises a grounding shielding polar plate 3 and a high-voltage shielding polar plate 2, and the grounding shielding polar plate 3 is arc-shaped. The contact box adopt a double-shielding polar plate structure, effectively improves the air gap field intensity inside the contact box, and reduces the risk of local discharge caused inside the contact box. Through designing into the arc structure with ground connection shielding polar plate 3, not only increased the distance between 3 tip of high pressure shielding polar plate 2 and ground connection shielding polar plate, made high pressure shielding polar plate 2 and 3 surface field intensity of ground connection shielding polar plate all satisfy field intensity control requirements, still avoided because of increasing the high pressure shielding polar plate 2 cover and gone into the degree of depth and lead to between high pressure shielding polar plate 2 and the high tension switchgear grounding cabinet body valve apart from reducing the risk that the insulating part internal surface that causes takes place the face flashover, improved the electrical safety of contact box. The plugging type contact box is suitable for a 40.5kV high-voltage switch cabinet.
Further, an insulating shield 11 is arranged at the bottom of the middle section of the insulating part 1; the insulation shield 11 is U-shaped. Through simulation analysis and experimental verification of an electric field, the arrangement of the U-shaped insulating shield 11 reduces the highest field intensity of the surface of the insulating part 1 by 18.35%, the field intensity of the surface of the insulating part 1 meets the field intensity control requirement, and the service life of the contact box is prolonged.
Further, a busbar outlet is arranged at the right end of the insulating part 1; the insulating part at the position of the female discharge wire port comprises a first insulating part and a second insulating part, wherein the top end of the first insulating part is provided with an opening, and the second insulating part is arranged above the periphery of the opening at the top end of the first insulating part. The left end of the insulating part at the female discharge wire port is embedded with a metal part 5. The metal piece 5 is connected with the high-voltage shielding polar plate 2 through a bolt 8. And a fixed contact mounting and fixing insert 6 and a busbar mounting and fixing insert 7 are mounted on the metal piece 5. And the static contact mounting and fixing insert 6 is used for mounting and fixing the static contact. And the busbar mounting fixing insert 7 is used for mounting and fixing the busbar. The metal piece 5 and the insulating piece 1 are integrally formed, the plugging effect is achieved, the problem that the air gap inside the contact box discharges electricity and endangers a gas chamber connected with the contact box through a busbar outlet is solved, and the electrical safety of the contact box is improved.
Furthermore, the outer side wall of the upper end of the second insulating part is provided with insulating sheds 10 which are uniformly distributed. The insulating umbrella skirt 10 of evenly distributed has increased the creepage distance of female discharge wire mouth department, has reduced female the arranging risk to its discharge, has improved the electrical safety of contact box.
Furthermore, an outer annular wall umbrella skirt 4 which is uniformly distributed is arranged on the outer side wall of the left end of the insulating part 1. The evenly distributed outer annular wall umbrella skirt 4 increases the creepage distance at the opening at the left end.
Furthermore, a contact box mounting fixing insert 9 is arranged on the outer side wall of the middle section of the insulating part 1, and a bolt in the contact box mounting fixing insert 9 is connected with the grounding shielding polar plate 3. The contact box mounting fixing insert 9 is used for mounting a fixed contact box.
Further, the insulating member 1, the insulating shield 11 and the metal member 5 are integrally cast.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (8)
1.40.5kV for high tension switchgear shutoff type contact box, its characterized in that: comprises an insulating part provided with a cavity and a double-shielding polar plate embedded in the side wall of the insulating part; the double-shielding polar plate comprises a grounding shielding polar plate and a high-voltage shielding polar plate, and the grounding shielding polar plate is arc-shaped; an insulating shield is arranged at the bottom of the middle section of the insulating part; a busbar outlet is arranged at the right end of the insulating part; the insulation piece at the position of the female discharge wire port comprises a first insulation part with an opening at the top end and a second insulation part arranged above the periphery of the opening at the top end of the first insulation part; and a metal piece is embedded into the left end of the insulating piece at the position of the female discharge line port.
2. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: the insulating shield is U-shaped.
3. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: and an insulating umbrella skirt is arranged on the outer side wall of the upper end of the second insulating part.
4. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: and an outer annular wall umbrella skirt is arranged on the outer side wall of the left end of the insulating piece.
5. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: and a contact box mounting and fixing insert is arranged on the outer side wall of the middle section of the insulating part, and a bolt in the contact box mounting and fixing insert is connected with the grounding shielding polar plate.
6. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: the high-voltage shielding polar plate is connected with the metal piece through a bolt.
7. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: and the metal piece is provided with a static contact mounting and fixing insert and a busbar mounting and fixing insert.
8. The plugging type contact box for the 40.5kV high-voltage switch cabinet according to claim 1, characterized in that: and the insulating part, the insulating shield and the metal part are integrally cast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120273447.1U CN214228770U (en) | 2021-01-29 | 2021-01-29 | Plugging type contact box for 40.5kV high-voltage switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120273447.1U CN214228770U (en) | 2021-01-29 | 2021-01-29 | Plugging type contact box for 40.5kV high-voltage switch cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN214228770U true CN214228770U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120273447.1U Active CN214228770U (en) | 2021-01-29 | 2021-01-29 | Plugging type contact box for 40.5kV high-voltage switch cabinet |
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| CN (1) | CN214228770U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389153A (en) * | 2022-01-18 | 2022-04-22 | 大连北方互感器集团有限公司 | Assembling method of novel wiring mechanism in electric power system |
-
2021
- 2021-01-29 CN CN202120273447.1U patent/CN214228770U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389153A (en) * | 2022-01-18 | 2022-04-22 | 大连北方互感器集团有限公司 | Assembling method of novel wiring mechanism in electric power system |
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