CN112018652B - Environment-friendly inflatable switch cabinet - Google Patents
Environment-friendly inflatable switch cabinet Download PDFInfo
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- CN112018652B CN112018652B CN202010873449.4A CN202010873449A CN112018652B CN 112018652 B CN112018652 B CN 112018652B CN 202010873449 A CN202010873449 A CN 202010873449A CN 112018652 B CN112018652 B CN 112018652B
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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
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
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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
- H02B1/015—Boards, panels, desks; Parts thereof or accessories therefor
- H02B1/04—Mounting thereon of switches or of other devices in general, the switch or device having, or being without, casing
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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
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention provides an environment-friendly inflatable switch cabinet, which solves the problem that insulating gas used in a C-GIS switch cabinet generates a greenhouse effect environment and is not beneficial to environmental protection. The intelligent cabinet comprises a cabinet body, a circuit breaker solid-sealed polar pole, a three-station device, a wire inlet and outlet sleeve and a top expansion sleeve or a side expansion sleeve; the top expanding sleeve or the side expanding sleeve is arranged on the cabinet body of the bus chamber; the three-station device is arranged on a metal partition plate between the bus chamber and the breaker chamber; the circuit breaker solid-sealed polar pole and the wire inlet and outlet sleeve are both arranged on the cabinet body of the circuit breaker chamber; the top expanding sleeve or the side expanding sleeve is electrically connected with the upper end of the three-station device through a connecting conductor; the lower end of the three-station sleeve is electrically connected with a movable end connecting hardware fitting of the circuit breaker solid-sealed polar pole through a connecting conductor; the static end connecting hardware fitting of the circuit breaker solid-sealed polar pole is electrically connected with the wire inlet and outlet sleeve through the connecting conductor; the circuit breaker solid-sealed polar pole, the three-station device, the wire inlet and outlet sleeve and the insulating sleeve of the top expansion sleeve or the side expansion sleeve are all provided with climbing-increasing structures.
Description
Technical Field
The invention belongs to the technical field of medium and high voltage power systems, and particularly relates to an environment-friendly inflatable switch cabinet.
Background
At present, the insulating gas in C-GIS switch cabinets of 40.5kV (36kV) and below at home and abroad is SF6The gas has excellent insulating property, strong arc extinguishing capability and reliable stability, is the mainstream insulating gas used in high-voltage C-GIS switch cabinets at home and abroad at present, but SF6But is a greenhouse effect gas, SF is clearly known from the book of the Jingdu protocol6The gas is listed as one of 6 gases that are globally restricted for use. SF6The greenhouse effect generated by gas is a global problem which cannot be ignored, China promises the climate change in Paris in 2015, actively assumes international responsibility in international society, and fully plays a constructive role in solving the problem of international climate change. Therefore, we should also respond to the industry call to develop the C-GIS switchSF in cabinet6The substitute gas is an environmentally friendly gas such as dry air, nitrogen, etc. since the environmentally friendly gas is mixed with SF6The insulating property is weak compared with that of gas, so that the prior SF6The insulating part used in the gas can not be directly applied to the environment-friendly gas C-GIS switch cabinet with limited space, otherwise, the risks of flashover, creepage and the like can occur. Therefore, there is a need to make an environmentally friendly gas-filled switch cabinet meeting performance requirements so as to truly realize replaceability.
Disclosure of Invention
The invention aims to solve the problem that the insulating gas used in the C-GIS switch cabinet in the prior art generates a greenhouse effect environment and is not beneficial to environmental protection, and provides an environment-friendly inflatable switch cabinet.
In order to achieve the purpose, the technical solution provided by the invention is as follows:
an environment-friendly inflatable switch cabinet comprises a cabinet body, wherein the cabinet body is divided into a bus chamber, a breaker chamber and a cable chamber from top to bottom by a metal partition plate; the device is characterized by also comprising a breaker solid-sealed polar pole, a three-station device, a wire inlet and outlet sleeve and a top expansion sleeve or a side expansion sleeve;
the top expanding sleeve or the side expanding sleeve is arranged on the cabinet body of the bus chamber; namely: a top expanding sleeve pipe can be adopted, and a side expanding sleeve pipe can also be adopted;
the three-station device is arranged on a metal partition plate between the bus chamber and the breaker chamber, the upper end of the three-station device is positioned in the bus chamber, and the lower end of the three-station device is positioned in the breaker chamber;
the circuit breaker solid-sealed polar pole and the wire inlet and outlet sleeve are both arranged on the cabinet body of the circuit breaker chamber; the top expansion sleeve or the side expansion sleeve is electrically connected with the upper end of the three-station device through a connecting conductor; the lower end of the three-station sleeve is electrically connected with a movable end connecting fitting of the circuit breaker solid-sealed polar pole through a connecting conductor; the static end connecting hardware fitting of the circuit breaker solid-sealed polar pole is electrically connected with the wire inlet and outlet sleeve through the connecting conductor; the wire inlet and outlet casing is usually externally connected with a cable, a lightning arrester or a voltage transformer (PT) and the like; the connecting conductor can be made of copper materials or aluminum materials, but when the connecting conductor is selected, copper materials such as copper bars or copper pipes are mostly used;
the circuit breaker seals utmost point post admittedly, three station devices, business turn over line sleeve pipe and top expand the sheathed tube or incline and expand sheathed tube insulating sheathe in and all be provided with the increase that is used for increasing along the face creepage distance and climb the structure, can promote the dielectric strength of each insulating part.
Further, the climbing structure is designed according to the following method:
1) determining the structural size of each insulating part in the environment-friendly type gas-filled switch cabinet:
for the insulating piece vertically installed in the bus chamber, the height of the insulating piece is determined to be less than or equal to the internal height h of the bus chamber1Is determined to have a maximum outer diameter of less than or equal to the bus compartment internal width b1And inner depth d1One fifth (the maximum outer diameter when the insulator is installed should also take into account the inner width b1And an internal depth d1Satisfies both requirements, i.e. not more than the inner width b1One fifth of and an internal depth d of less than or equal to1One fifth of the total); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
for the insulating piece horizontally arranged in the bus chamber, the height of the insulating piece is determined to be less than or equal to the internal width b of the bus chamber1Is determined to have a maximum outer diameter of less than or equal to the bus compartment internal width b1And inner depth d1One fifth (the maximum outer diameter when the insulator is installed should also take into account the inner width b1And an internal depth d1Satisfies both requirements, i.e. not more than the internal width b1One fifth of and an internal depth d of less than or equal to1One fifth of the total); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the limited insulating part;
for the insulating part vertically installed in the breaker chamber, the height of the insulating part is determined to be less than or equal to the height h of the interior of the breaker chamber2One fifth of; determining the maximum outer diameter of the breaker chamber to be less than or equal to the inner width b of the breaker chamber2And insideDepth d2One fifth (the maximum outer diameter when the insulator is installed should also take into account the inner width b2And an internal depth d2Satisfies both requirements, i.e. not more than the inner width b2One fifth of and an internal depth d of less than or equal to2One fifth of the total); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the limited insulating part;
for the horizontally installed insulating member in the breaker chamber, the height of the insulating member is determined to be less than or equal to the width b of the interior of the breaker chamber2One fifth of; determining the maximum outer diameter of the breaker chamber to be less than or equal to the inner width b of the breaker chamber2And inner depth d2One fifth (the maximum outer diameter when the insulator is installed should also take into account the inner width b2And an internal depth d2Satisfies both requirements, i.e. not more than the inner width b2One fifth of and an internal depth d of less than or equal to2One fifth of the total); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
among the insulators, the insulator insulation thickness t at the position of the maximum outer diameter of the high-voltage conductor1More than or equal to 25mm and less than or equal to 40 mm; insulation thickness t of insulation part at outer shielding ring corresponding to maximum outer diameter of high-voltage conductor2More than or equal to 25mm and less than or equal to 40 mm;
the insulation field intensity on the surface of the insulation piece is less than or equal to 1.2 kV/mm;
2) determining the creepage increasing structure of each insulating part:
determining the creepage distance according to the standard that every kilovolt is more than or equal to 5mm and less than or equal to 10mm, and designing a creepage increasing structure meeting the requirement according to the creepage distance; the climbing structure is at least one layer of climbing skirts, the climbing skirts are arranged at the end parts, located in the air chamber, of the insulating sleeves of the insulating parts from inside to outside in the radial direction, and climbing grooves are formed between the adjacent climbing skirts;
under the condition that the whole insulation height of the insulation part is not changed, the climbing skirt is added according to each timeDielectric level U of insulating memberPThe number of layers of the climbing skirts is determined by improving the standard of 5-10%, and the insulation piece along-surface voltage-resistant level U is improved by increasing the number of layers of the climbing skirts in consideration of the requirement of the space size of the cabinet bodyP300V per millimeter or more and 400V per millimeter or less.
Further, in the step 2), when the climbing-increasing skirt is provided with one layer, a climbing-increasing groove is formed between the climbing-increasing skirt and the high-voltage conductor or between the climbing-increasing skirt and the inner wall of the insulating sleeve;
when the climbing skirts are provided with multiple layers, climbing grooves are formed between the innermost climbing skirt and the high-voltage conductor or between the outermost climbing skirt and the inner wall of the insulating sleeve, the end face of the high-voltage conductor, which is positioned at the same end as the climbing skirts, is used as a reference surface, and the distance between the top end of the outer climbing skirt and the reference surface is 10-50 mm longer than the distance between the top end of the inner climbing skirt and the reference surface;
defining: the height of the climbing skirt is H from inside to outsidenWherein n is the number of the layers of the climbing skirt; the maximum width of the climbing groove is K; the round angle at the top end of the climbing skirt is R1(ii) a The chamfer angle at the bottom of the climbing groove is R2；
Considering the limit of the cabinet space, the HnThe range of (A) is 10-50 mm, and K is more than or equal to 2K and less than or equal to 2K;
the R is1The range of (1.5) to (4) mm;
the R is2The range of (1) is 2-5 mm.
Furthermore, the circuit breaker solid-sealed polar pole comprises a vacuum bulb, a static end connecting hardware fitting, a movable end connecting hardware fitting and a movable end sliding hardware fitting which are positioned in the same insulating sleeve;
the insulating sleeve comprises a vertical insulating cylinder and a middle transverse insulating cylinder which are communicated with each other;
the static end connecting hardware fitting, the vacuum bulb and the movable end sliding hardware fitting are sequentially arranged in the vertical insulating cylinder from top to bottom; the movable end connecting hardware fitting is positioned in the transverse insulating cylinder, and one end of the movable end connecting hardware fitting extends into the vertical insulating cylinder;
one end of the static end connecting hardware fitting is electrically connected with the static end of the vacuum bulb;
one end of the movable end sliding hardware fitting is electrically connected with the movable end of the vacuum bulb;
one end of the movable end connecting fitting extends into the vertical insulating cylinder and is electrically connected with the conductive contact fingers on the circumference of the movable end sliding fitting;
two layers of climbing skirts are arranged on the inner walls of the insulating sleeves wrapping the end part of the other end of the static end connecting hardware fitting, the end part wrapping the other end of the movable end connecting hardware fitting and the other end of the movable end sliding hardware fitting;
wherein, a climbing groove is formed between the static end connecting hardware fitting and the inner side climbing skirt wrapping the static end connecting hardware fitting; a climbing groove is formed between the movable end connecting hardware fitting and the inner side climbing skirt wrapping the movable end connecting hardware fitting; an increasing climbing groove is formed between the outer increasing climbing skirt at the position of the movable end sliding hardware fitting and the inner wall of the insulating cylinder.
Further, the three-position device comprises a bus connecting piece and a three-position sleeve;
the bus connecting piece comprises a first high-voltage conductor and a first insulating sleeve; the three-station sleeve comprises a second high-voltage conductor and a second insulating sleeve; the first insulating sleeve and the second insulating sleeve connect the bus connecting piece with the three-station sleeve through the third insulating sleeve;
the second high-voltage conductor is T-shaped and comprises a transverse hardware fitting and a vertical hardware fitting, the transverse hardware fitting is a functional part of the three-station device, and the end part of the vertical hardware fitting is connected with a movable end connecting hardware fitting of the circuit breaker solid-sealed polar pole; the second insulating sleeve comprises a transverse insulating sleeve and a vertical insulating sleeve which are matched with the second high-voltage conductor; a layer of climbing skirt is arranged at the end part of the vertical insulating sleeve, and a climbing groove is formed between the climbing skirt and the vertical hardware fitting;
the first insulating sleeve, the transverse insulating sleeve of the second insulating sleeve, the vertical insulating sleeve of the second insulating sleeve and the third insulating sleeve can be independently molded and assembled into a whole, and can also be cast and molded into a whole at one time; and the respective insulating sleeve may also be processed more optimally, e.g. the part of the first insulating sleeve outside the first high voltage conductor may be omitted optimally.
Furthermore, two layers of climbing-increasing skirts are arranged on the wire inlet and outlet sleeve and the end insulating sleeves connected with the connecting conductors on the top expanding sleeve or the side expanding sleeve, wherein climbing-increasing grooves are formed between the inner side climbing-increasing skirts and the high-voltage conductors of the sleeves.
Furthermore, a grading ring and a shielding ring are arranged on the wire inlet and outlet sleeve;
shielding rings are arranged on the top expanding sleeve and the three-station sleeve;
and equalizing rings are arranged in the insulating cylinder at the joint of the static end connecting fitting and the vacuum bulb, and/or in the insulating cylinder between the movable end connecting fitting and the vacuum bulb, and/or in the insulating cylinder in the movable area of the movable end sliding fitting.
Further, in step 1), the t is1Is 30mm, t2Is 30 mm.
In the step 2), considering the space size requirement of the cabinet body, determining the creepage distance s according to the standard that every kilovolt is greater than or equal to 6mm and less than or equal to 8 mm; insulating part edge surface voltage-resistant horizontal U with increased number of layers of climbing skirtsPIs 350V per mm.
Furthermore, the chamfer angle of the connecting conductor is 4-6 mm, and the distance between the connecting conductor and the cabinet body is 160-180 mm; the chamfer angle of the shielding ring is 16-20 mm; the cabinet body outside is provided with the radiator.
Further, considering that the closer the adhesive force between the insulating gas and the surface of the insulating part is, the higher the insulating strength of the surface of the insulating part is, a mold closing seam cannot be arranged along the creepage distance direction of the surface when the circuit breaker solid-sealed polar pole, the three-station device, the wire inlet and outlet sleeve and the top expansion sleeve or the side expansion sleeve are manufactured.
The invention has the advantages that:
the environment-friendly gas-filled switch cabinet can meet the performance requirements of C-GIS switch cabinets of 40.5kV and below (for example, rated voltage is 36kV, 24kV or 12kV), and the insulation strength of each insulation part is improved in a limited space so as to adapt to the insulation property with weak environment-friendly gas, fill up the blank of the industry and respond to the call of the industry.
Drawings
FIG. 1 is a schematic view of an environmentally friendly gas-filled switchgear according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a two-environment protection type gas-filled switchgear according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a top-expanded casing according to the present invention;
FIG. 4 is a schematic structural view of a three-station apparatus according to the present invention;
FIG. 5 is a schematic structural view of a circuit breaker embedded pole of the present invention;
FIG. 6 is a schematic structural view of the wire inlet/outlet sleeve of the present invention;
FIG. 7 is a cloud of the electric field intensity of the high voltage conductor when the conductor chamfer R6 is connected;
FIG. 8 is a cloud of the electric field intensity of the high voltage conductor when the shielding ring is chamfered at R20;
FIG. 9 is a first cloud of electric field strengths for the insulator used in FIG. 1;
FIG. 10 is a second cloud of electric field strengths for the insulation used in FIG. 1;
the reference numbers are as follows:
1-bus chamber, 2-circuit breaker chamber, 3-metal partition, 4-top expanded sleeve, 5-three-station device, 6-circuit breaker solid-sealed pole, 7-wire inlet and outlet sleeve, 8-connecting conductor, 9-side expanded sleeve, 10-radiator mounting rack, 11-cabinet, 12-hardware, 13-insulating sleeve, 14-climbing skirt, 15-climbing groove, 16-voltage-equalizing ring, 17-shielding ring, 18-climbing surface, 19-mounting fixing hole, 20-bus connecting piece, 21-first high-voltage conductor, 22-first insulating sleeve, 23-second high-voltage conductor, 24-second insulating sleeve, 25-third insulating sleeve, 26-transverse hardware, 27-vertical hardware, 28-transverse insulating sleeve, 29-vertical insulating sleeve, 30-vertical insulating cylinder, 31-middle transverse insulating cylinder, 32-static end link fitting, 33-movable end link fitting, 34-movable end sliding fitting, 35-conductive contact finger, 36-vacuum bulb, 37-insulating pull rod area, 38-three-station sleeve and 39-spring contact finger.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
example one
As shown in fig. 1 and fig. 3 to fig. 6, an environment-friendly inflatable switch cabinet comprises a cabinet body 11, a breaker embedded pole 6, a three-station device 5, three in-out bushings 7 and three top expansion bushings 4, wherein the breaker embedded pole 6, the three-station device, the three in-out bushings 7 and the three top expansion bushings 4 are positioned in the cabinet body 11;
the cabinet body 11 is divided into a bus chamber 1, a breaker chamber 2 and a cable chamber from top to bottom by a metal partition plate 3.
Three top expansion sleeves 4 are mounted side by side on the top plate of the busbar compartment 1.
The three-station device 5 comprises a bus connecting piece 20 and a three-station sleeve 38 which are arranged in an integrated insulating sleeve; the busbar connection 20 comprises a first high voltage conductor 21 and a first insulating sleeve 22; the three-position bushing 38 comprises a second high-voltage conductor 23 and a second insulating sleeve 24; the second high-voltage conductor 23 is in a T shape and comprises a transverse fitting 26 and a vertical fitting 27, wherein the transverse fitting 26 is a functional part of the three-station sleeve 38; the second insulating sleeve 24 comprises a transverse insulating sleeve 28 and a vertical insulating sleeve 29 adapted to the second high voltage conductor 23; the grounded fixed end of the three-station sleeve 38 is positioned in the middle of the vertical insulating sleeve 29; the ground fixing end of the first insulating bush 22 and the ground fixing end of the second insulating bush 24 are connected through a third insulating bush 25. The three-position bushing 38 is vertically installed on the metal partition plate 3 through the grounding ends of the two insulating sleeves (the first insulating sleeve and the second insulating sleeve), one end of the three-position bushing 38 provided with the functional part and the bus connecting piece 20 are both located in the bus chamber 1, and the other end of the three-position bushing 38 is located in the circuit breaker chamber 2. Spring contact fingers 39 and/or strap contact finger grooves for sliding electrical connection are arranged in the first high voltage conductor 21 and the second high voltage conductor 23, or spring contact fingers 39 and/or strap contact finger grooves are arranged on an electrical connection guide rod sliding in the first high voltage conductor 21 and the second high voltage conductor 23.
The circuit breaker solid-sealed pole 6 is horizontally arranged on the cabinet body 11 of the circuit breaker chamber 2 and comprises a vacuum bulb 36, a static end connecting fitting 32, a moving end connecting fitting 33 and a moving end sliding fitting 34 which are positioned in the same insulating sleeve; the circuit breaker solid-sealed pole 6 insulating sleeve comprises a vertical insulating cylinder 30 and a middle transverse insulating cylinder 31, and one end of the middle transverse insulating cylinder 31 is communicated with the middle of the vertical insulating cylinder 30; the static end connecting hardware fittings 32, the vacuum bubbles 36 and the dynamic end sliding hardware fittings 34 are sequentially arranged in the vertical insulating cylinder 30 from top to bottom; the movable end connecting fitting 33 is positioned in the middle transverse insulating cylinder 31, and one end of the movable end connecting fitting extends into the vertical insulating cylinder 30 and is electrically connected with the conductive contact fingers 35 at the circumferential direction of the movable end sliding fitting 34; the area below the sliding fitting 34 at the moving end in the vertical insulating cylinder 30 is an insulating pull rod area 37.
The three wire inlet and outlet bushings 7 are arranged on the bottom plate of the breaker chamber 2 side by side, and the types of the wire inlet and outlet bushings 7 can be different types of inner cone bushings according to requirements.
The three top expansion sleeves 4 are electrically connected with the bus connecting piece 20 through the connecting conductor 8; the vertical hardware 27 of the three-station sleeve 38 is electrically connected with the movable end connecting hardware 33 of the circuit breaker solid-sealed polar pole 6 through the connecting conductor 8; the static end connecting hardware 32 of the solid-sealed polar pole 6 of the circuit breaker is electrically connected with the three wire inlet and outlet sleeves 7 through the connecting conductor 8. Connecting conductor adopts the copper bar in this embodiment, and copper bar chamfer R is 4 ~ 6mm, and the distance between copper bar and the cabinet body 11 is 160 ~ 180 mm.
The circuit breaker seals utmost point post 6 admittedly, three station devices 5, business turn over line sleeve pipe 7 and top expand all to be provided with on the insulating boot of sleeve pipe 4 and be used for increasing along the face creepage distance and increase and climb the structure.
The climbing structure is designed according to the following method:
1) determining the structural size of each insulating part in the environment-friendly type gas-filled switch cabinet:
for the insulators (the top expanding sleeve 4 and the upper end of the three-position device 5) vertically arranged in the bus bar room 1, the height of the insulators is determined to be less than or equal to the internal height h of the bus bar room 11Is determined to have a maximum outer diameter less than or equal to the internal width b of the busbar compartment 11And inner depth d1One fifth of; verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
for the vertically installed insulation parts (the lower end of the three-station device 5 and the wire inlet and outlet sleeve 7) in the circuit breaker chamber 2, the height of the insulation parts is determined to be less than or equal to the internal height h of the circuit breaker chamber 22One fifth of; is determined to have a maximum outer diameter less than or equal to the inner width b of the breaker chamber 22And inner depth d2One fifth of; verifying and adjusting the height and maximum outer diameter of the insulator according to the insulation field strength, wherein the adjustment is necessaryThe height and maximum outer diameter size conditions of the defined insulating part are met;
for the horizontally installed insulating member (breaker embedded pole 6) in the breaker chamber 2, the height of the insulating member is determined to be less than or equal to the internal width b of the breaker chamber 22One fifth of; is determined to have a maximum outer diameter less than or equal to the inner width b of the breaker chamber 22And inner depth d2One fifth of; verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
among the insulators, the insulator insulation thickness t at the maximum outer diameter of the high-voltage conductor (namely, hardware fitting)1Greater than or equal to 25mm and less than or equal to 40mm, preferably 30 mm; the insulation thickness t of the insulation at the outer screening ring 17 corresponding to the maximum outer diameter of the high voltage conductor2Greater than or equal to 25mm and less than or equal to 40mm, preferably 30 mm;
the insulation field intensity on the surface of the insulation piece is less than or equal to 1.2 kV/mm;
2) determining the creepage increasing structure of each insulating part:
determining the creepage distance according to the standard that each kilovolt is more than or equal to 5mm and less than or equal to 10mm, and preferably 6-8 mm per kilovolt in consideration of the space size requirement of the cabinet body 11; designing a creepage increasing structure meeting the requirement according to the creepage distance; the climbing structure is at least one layer of climbing skirts 14, the climbing skirts 14 are arranged at the end parts, located in the air chamber, of the insulating sleeves of the insulating parts from inside to outside in the radial direction, and climbing grooves 15 are formed between the adjacent climbing skirts 14;
under the condition that the whole insulation height of the insulation member is not changed, the voltage-resistant level U of the insulation member is enabled to be equal to each time one climbing skirt 14 is addedPThe number of layers of the climbing skirts 14 is determined by increasing the standard of 5-10%, and the insulation part along-surface voltage resistance level U is increased by increasing the number of layers of the climbing skirts 14P300V or more and 400V or less, preferably 350V or more per mm.
Two layers of climbing-increasing skirts 14 are arranged on end insulating sleeves of the top expanding sleeve 4, the wire inlet and outlet sleeve 7 and the circuit breaker solid-sealed polar pole 6 connected with the connecting conductor 8, climbing-increasing grooves 15 are formed between the inner climbing-increasing skirts 14 and high-voltage conductors of all insulating parts, and climbing-increasing grooves 15 are formed between the two layers of climbing-increasing skirts 14; the end part insulating sleeve of the three-station sleeve 38 connected with the connecting conductor 8 is provided with a layer of climbing-increasing skirt 14, and a climbing-increasing groove 15 is formed between the layer of climbing-increasing skirt 14 and the hardware 12. Two layers of climbing skirts 14 are arranged on the inner wall of the other end of the circuit breaker solid-sealed pole 6 wrapping the movable end sliding hardware fitting 34; an increasing climbing groove 15 is formed between the outermost increasing climbing skirt 14 at the movable end sliding fitting 34 and the inner wall of the insulating sleeve, and an increasing climbing groove 15 is formed between the two layers of increasing climbing skirts 14. The peripheral surface of the insulating sleeve of each insulating piece, the climbing-increasing skirt 14 and the climbing-increasing groove 15 form a climbing-increasing surface 18 of the insulating piece.
The climbing skirt 14 is in a convex ring shape; in order to increase the length of the surface, the outside of the vertical insulating sleeve 29 below the grounding fixed end of the three-station sleeve 38 is also provided with a climbing-increasing umbrella.
The wire inlet and outlet sleeve 7 is provided with a grading ring 16 and a shielding ring 17; the top expansion sleeve 4 and the three-station sleeve 38 are provided with shielding rings 17; and a grading ring 16 is arranged in an insulating cylinder at the joint of the static end connecting fitting 32 and the vacuum bulb 36, and/or in an insulating cylinder between the movable end connecting fitting 33 and the vacuum bulb 36, and/or in an insulating cylinder in the movable area of the movable end sliding fitting 34.
The shielding ring 17 is made of a conductive or semiconductive material, is arranged close to the mounting fixing hole 19 and is electrically connected with the metal insert of the mounting fixing hole 19, and the shielding ring 17 can also be used for testing electricity by being fixedly connected with an electricity testing wire hole.
In order to ensure the heat dissipation of the cabinet 11, a heat sink is mounted on the outside of the cabinet 11 through the heat sink mounting bracket 10.
In order to screen out the optimal copper bar, 3D images of the cabinet body are input through electric field simulation software, boundary conditions and material parameters are set to calculate the electric field strength value, and the electric field strength values under different conditions are calculated by changing the chamfering size of the copper bar in the 3D images according to the design principle to obtain the optimal design scheme.
| Copper bar chamfer | High voltage conductor electric field intensity |
| R6 | 2.1kV/mm |
| R4 | 2.2kV/mm |
It can be seen from the above table that the larger the chamfer of the copper bar is, the smaller the field intensity is, therefore, the chamfer R6 of the copper bar is the optimal scheme, and the electric field intensity cloud chart of the high-voltage conductor is shown in fig. 7.
In order to screen the optimal shielding ring 17, the electric field strength under different conditions is calculated by changing the chamfer size of the bolt connection shielding ring 17 in the 3D diagram, so that the optimal design scheme is obtained.
| Shielding ring chamfer | High voltage conductor electric |
| R20 | |
| 2·lkV/ | |
| R16 | |
| 2·18kV/mm |
It can be seen from the above table that the larger the chamfer of the shielding ring is, the smaller the field intensity is, therefore, the chamfer R20 of the shielding ring 17 is the optimal solution, and the cloud chart of the field intensity of the high-voltage conductor is shown in fig. 8.
In order to verify the insulation strength of the insulation part designed in the above manner, electric field simulation calculation is performed on the actual working condition of the insulation part in the gas-filled cabinet, and the calculation results are shown in fig. 9 and 10, wherein the epoxy surface field intensity is less than 1.2 kV/mm.
Example two
As shown in fig. 2, instead of implementing one, the three top reamers 4 are replaced by three side reamers 9.
The side expanding sleeve 9 is used as an insulating piece horizontally arranged in the bus bar room 1, and the height of the side expanding sleeve is less than or equal to the internal width b of the bus bar room 11One fourth of (a).
Considering that the closer the adhesive force between the insulating gas and the surface of the insulating part is, the higher the insulating strength of the surface of the insulating part is, the mold closing seam cannot be arranged along the creepage distance direction of the surface when the circuit breaker fixedly-sealed polar pole, the three-station device, the wire inlet and outlet sleeve and the top expansion sleeve or the side expansion sleeve are manufactured.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present disclosure.
Claims (9)
1. An environment-friendly inflatable switch cabinet comprises a cabinet body (11), wherein the cabinet body (11) is divided into a bus chamber (1), a breaker chamber (2) and a cable chamber from top to bottom by a metal partition plate (3);
the method is characterized in that: the device also comprises a breaker solid-sealed pole (6), a three-station device (5), a wire inlet and outlet sleeve (7) and a top expansion sleeve (4) or a side expansion sleeve (9);
the top expanding sleeve (4) or the side expanding sleeve (9) is arranged on a cabinet body (11) of the bus chamber (1);
the three-station device (5) is arranged on a metal partition plate (3) between the bus chamber (1) and the breaker chamber (2), the upper end of the three-station device is positioned in the bus chamber (1), and the lower end of the three-station device is positioned in the breaker chamber (2);
the circuit breaker solid-sealed polar pole (6) and the wire inlet and outlet sleeve (7) are both arranged on a cabinet body (11) of the circuit breaker chamber (2);
the top expanding sleeve (4) or the side expanding sleeve (9) is electrically connected with the upper end of the three-station device (5) through a connecting conductor (8); the lower end of the three-station sleeve (38) is electrically connected with a movable end connecting fitting (33) of the circuit breaker solid-sealed polar pole (6) through a connecting conductor (8); a static end connecting hardware fitting (32) of the circuit breaker solid-sealed polar pole (6) is electrically connected with the wire inlet and outlet sleeve (7) through a connecting conductor (8);
the circuit breaker solid-sealed pole (6), the three-station device (5), the wire inlet and outlet sleeve (7) and an insulating sleeve of the top expansion sleeve (4) or the side expansion sleeve (9) are provided with creepage increasing structures for increasing creepage distance along the surface;
the climbing structure is designed according to the following method:
1) determining the structural size of each insulating part in the environment-friendly type gas-filled switch cabinet:
for the insulator vertically installed in the bus bar chamber (1), determining that the height of the insulator is less than or equal to one fourth of the internal height h1 of the bus bar chamber (1), and determining that the maximum external diameter of the insulator is less than or equal to one fifth of the internal width b1 and the internal depth d1 of the bus bar chamber (1); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
for the insulating piece horizontally arranged in the bus bar chamber (1), the height of the insulating piece is determined to be less than or equal to one fourth of the internal width b1 of the bus bar chamber (1), and the maximum outer diameter of the insulating piece is determined to be less than or equal to one fifth of the internal width b1 and the internal depth d1 of the bus bar chamber (1); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
for the insulating piece vertically installed in the breaker chamber (2), determining that the height of the insulating piece is less than or equal to one fifth of the height h2 in the breaker chamber (2); determining that the maximum outer diameter is less than or equal to one fifth of the internal width b2 and the internal depth d2 of the breaker chamber (2); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
for the insulating piece horizontally arranged in the breaker chamber (2), determining the height of the insulating piece to be less than or equal to one fifth of the internal width b2 of the breaker chamber (2); determining that the maximum outer diameter is less than or equal to one fifth of the internal width b2 and the internal depth d2 of the breaker chamber (2); verifying and adjusting the height and the maximum outer diameter of the insulating part according to the insulating field intensity, wherein the adjustment must meet the size conditions of the height and the maximum outer diameter of the insulating part;
in the insulating part, the insulating part insulation thickness t1 at the maximum outer diameter position of the high-voltage conductor is more than or equal to 25mm and less than or equal to 40 mm; the insulation thickness t2 of the insulation piece at the position of the outer shielding ring (17) corresponding to the maximum outer diameter of the high-voltage conductor is more than or equal to 25mm and less than or equal to 40 mm;
the insulation field intensity on the surface of the insulation piece is less than or equal to 1.2 kV/mm;
2) determining the creepage increasing structure of each insulating part:
determining the creepage distance according to the standard that every kilovolt is more than or equal to 5mm and less than or equal to 10mm, and designing a creepage increasing structure meeting the requirement according to the creepage distance; the climbing structure is at least one layer of climbing skirts (14), the climbing skirts (14) are arranged at the end parts, located in the air chamber, of the insulating sleeves of the insulating parts from inside to outside in the radial direction, and climbing grooves (15) are formed between every two adjacent climbing skirts (14);
under the condition that the whole insulation height of the insulation part is not changed, the number of layers of the climbing skirts (14) is determined according to the standard that the withstand voltage level UP of the insulation part is improved by 5% -10% when one climbing skirt (14) is added, and the withstand voltage level UP of the insulation part along the surface, which is improved by the increase of the number of layers of the climbing skirts (14), is more than or equal to 300V and less than or equal to 400V every millimeter.
2. The environmentally friendly gas-filled switchgear cabinet according to claim 1, wherein:
in the step 2), when the climbing-increasing skirt (14) is provided with a layer, a climbing-increasing groove (15) is formed between the climbing-increasing skirt and the high-voltage conductor or between the climbing-increasing skirt and the inner wall of the insulating sleeve;
when the climbing skirts (14) are provided with multiple layers, climbing grooves (15) are formed between the innermost climbing skirt (14) and the high-voltage conductor or between the outermost climbing skirt (14) and the inner wall of the insulating sleeve, the end face of the high-voltage conductor, which is positioned at the same end as the climbing skirts (14), is used as a reference surface, and the distance between the top end of the outer climbing skirt (14) and the reference surface is 10-50 mm longer than the distance between the top end of the inner climbing skirt (14) and the reference surface;
defining: the height of the climbing skirt (14) is H from inside to outsidenWherein n is the number of layers of the climbing skirt (14); the maximum width of the creeping increasing groove (15) is K; the round angle at the top end of the climbing-increasing skirt (14) is R1(ii) a The chamfer at the bottom of the creeping-increasing groove (15) is R2；
Said HnThe range of (A) is 10-50 mm, and K is more than or equal to 2K and less than or equal to 2K;
the R is1The range of (1.5) to (4) mm;
the R is2The range of (2) to (5) mm.
3. The environmentally friendly gas-filled switchgear cabinet according to claim 2, wherein:
the circuit breaker solid-sealed pole (6) comprises a vacuum bulb (36), a static end connecting fitting (32), a dynamic end connecting fitting (33) and a dynamic end sliding fitting (34) which are positioned in the same insulating sleeve;
the insulation sleeve comprises a vertical insulation cylinder (30) and a middle transverse insulation cylinder (31) which are communicated with each other;
the static end connecting fitting (32), the vacuum bulb (36) and the movable end sliding fitting (34) are sequentially arranged in the vertical insulating cylinder (30) from top to bottom; the movable end connecting hardware fitting (33) is positioned in the transverse insulating cylinder, and one end of the movable end connecting hardware fitting extends into the vertical insulating cylinder (30);
one end of the static end connecting hardware fitting (32) is electrically connected with the static end of the vacuum bulb (36);
one end of the movable end sliding fitting (34) is electrically connected with the movable end of the vacuum bulb (36);
one end of the movable end connecting fitting (33) extends into the vertical insulating cylinder (30) and is electrically connected with the conductive contact fingers (35) on the circumferential direction of the movable end sliding fitting (34);
two layers of climbing skirts (14) are arranged on the inner walls of the insulating sleeves wrapping the end part of the other end of the static end connecting fitting (32), the end part wrapping the other end of the moving end connecting fitting (33) and the other end of the moving end sliding fitting (34);
wherein, a climbing-increasing groove (15) is formed between the static end connecting hardware (32) and the inner climbing-increasing skirt (14) wrapping the static end connecting hardware; a climbing groove (15) is formed between the movable end connecting fitting (33) and the inner side climbing skirt (14) wrapping the movable end connecting fitting; an increasing climbing groove (15) is formed between the outer increasing climbing skirt (14) at the position of the movable end sliding hardware (34) and the inner wall of the insulating cylinder.
4. The environmentally friendly gas-filled switchgear cabinet according to claim 3, wherein:
the three-position device (5) comprises a bus connector (20) and a three-position sleeve (38);
the busbar connection piece (20) comprises a first high-voltage conductor (21) and a first insulating sleeve (22); the three-position bushing (38) comprises a second high-voltage conductor (23) and a second insulating sleeve (24); the first insulating sleeve (22) and the second insulating sleeve (24) connect the bus connecting piece (20) with the three-position sleeve (38) through the third insulating sleeve (25);
the second high-voltage conductor (23) is T-shaped and comprises a transverse fitting (26) and a vertical fitting (27), the transverse fitting (26) is a functional part of the three-station device (5), and the end part of the vertical fitting (27) is connected with a movable end connecting fitting (33) of the circuit breaker solid-sealed polar pole (6); the second insulating sleeve (24) comprises a transverse insulating sleeve (28) and a vertical insulating sleeve (29) which are matched with the second high-voltage conductor (23); the end part of the vertical insulating sleeve (29) is provided with a layer of climbing skirt (14), and a climbing groove (15) is formed between the climbing skirt (14) and the vertical hardware fitting (27).
5. The environmentally friendly inflatable switchgear cabinet according to claim 4, wherein:
two layers of climbing skirts (14) are arranged on end insulating sleeves (13) which are connected with connecting conductors (8) on the wire inlet and outlet sleeve (7) and the top expanding sleeve (4) or the side expanding sleeve (9), wherein climbing grooves (15) are formed between the inner side climbing skirts (14) and high-voltage conductors of the sleeves.
6. The environmentally friendly gas-filled switchgear cabinet according to claim 5, wherein:
a grading ring (16) and a shielding ring (17) are arranged on the wire inlet and outlet sleeve (7);
the top expanding sleeve (4) and the three-station sleeve (38) are provided with shielding rings (17);
and a grading ring (16) is arranged in an insulating cylinder at the joint of the static end connecting fitting (32) and the vacuum bulb (36), and/or in an insulating cylinder between the movable end connecting fitting (33) and the vacuum bulb (36), and/or in an insulating cylinder in the movable area of the movable end sliding fitting (34).
7. The environmentally friendly gas-filled switchgear cabinet according to claim 6, wherein:
in step 1), the t is1Is 30mm, t2Is 30 mm;
in the step 2), determining the creepage distance s according to the standard that each kilovolt is greater than or equal to 6mm and less than or equal to 8 mm; insulating member along-surface withstand voltage level U improved by increasing the number of layers of climbing skirts (14)PIs 350V per mm.
8. The environmentally friendly gas-filled switchgear cabinet according to claim 7, wherein:
the chamfer angle of the connecting conductor (8) is 4-6 mm, and the distance between the connecting conductor (8) and the cabinet body (11) is 160-180 mm;
the chamfer angle of the shielding ring (17) is 16-20 mm;
the outer side of the cabinet body (11) is provided with a radiator.
9. The environmentally friendly gas-filled switchgear cabinet according to claim 8, wherein:
the circuit breaker seals utmost point post (6) admittedly, three station device (5), business turn over line sleeve pipe (7) and top expand sleeve pipe (4) or side expand sleeve pipe (9) and can not be provided with the die-closing seam along the creep distance direction on surface when making.
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| CN202010873449.4A CN112018652B (en) | 2020-08-26 | 2020-08-26 | Environment-friendly inflatable switch cabinet |
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| CN202010873449.4A CN112018652B (en) | 2020-08-26 | 2020-08-26 | Environment-friendly inflatable switch cabinet |
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| CN103368087A (en) * | 2013-07-17 | 2013-10-23 | 中国船舶重工集团公司第七0四研究所 | Marine large-capacity main distribution board control screen |
| CN106469594A (en) * | 2015-08-19 | 2017-03-01 | 北京天威瑞恒高压套管有限公司 | High voltage insulation structure, cable termination, bus, bushing and bushing shell for transformer |
| CN107910800A (en) * | 2017-12-22 | 2018-04-13 | 上海攀森电气设备有限公司 | A kind of novel shielding type solid insulation ring main unit |
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| KR101017385B1 (en) * | 2008-08-25 | 2011-02-28 | 주식회사 효성 | Gas Insulation switchgear |
| CN202434941U (en) * | 2011-12-26 | 2012-09-12 | 沈阳华德海泰电器有限公司 | High-voltage and high-current insulating metal closed switch equipment using dry compressed air |
| CN202523495U (en) * | 2012-03-14 | 2012-11-07 | 西安神电高压电器有限公司 | External cone insulation cap |
| CN106848909A (en) * | 2017-04-24 | 2017-06-13 | 江苏大全长江电器股份有限公司 | One kind is without isolated switchgear under bin static contact non-SF 6 gas insulative |
| CN107404084A (en) * | 2017-09-26 | 2017-11-28 | 湖北网安科技有限公司 | A kind of compact type environment-protection gas inflated ring main unit |
| CN207910352U (en) * | 2018-03-28 | 2018-09-25 | 山东泰开成套电器有限公司 | A kind of environment-friendly type nitrogen insulation metal enclosed switch device |
| CN111276896A (en) * | 2020-03-19 | 2020-06-12 | 广西银河迪康电气有限公司 | Three air chamber inflatable high-voltage switch |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368087A (en) * | 2013-07-17 | 2013-10-23 | 中国船舶重工集团公司第七0四研究所 | Marine large-capacity main distribution board control screen |
| CN106469594A (en) * | 2015-08-19 | 2017-03-01 | 北京天威瑞恒高压套管有限公司 | High voltage insulation structure, cable termination, bus, bushing and bushing shell for transformer |
| CN107910800A (en) * | 2017-12-22 | 2018-04-13 | 上海攀森电气设备有限公司 | A kind of novel shielding type solid insulation ring main unit |
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