Protective shed for transformer substation

Abstract

The utility model discloses a protective shed for a transformer substation, which has the specific structure that two rows of first support guide rails and second support guide rails are arranged between sleeves of a GIS (Gas Insulated Switchgear) combined electric appliance, and a plurality of movable ceilings capable of moving are arranged between the first support guide rails and the second support guide rails side by side; and the plurality of movable ceilings can move towards one side or two sides in sequence so as to expose the maintenance space. By means of the structure, the protective shed can be built according to the characteristics of an existing outdoor transformer substation, operation of electrification or partial power failure is effectively achieved, and meanwhile the problem of overhauling or patrolling of equipment with narrow space in the protective shed is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of substations, and particularly relates to a substation protection shed. Background Technique

[0002] In recent years, with the substantial increase in the total installation amount of GIS equipment, the number of defects and anomalies has gradually increased, and the number of temporary power outages has increased year by year. Compared with open-air equipment, GIS equipment has a larger power outage range and longer time during maintenance, which has a greater impact on the safe and stable operation of the power grid. After analysis, defects mainly occur in outdoor GIS equipment, and the poor operating environment is the main reason for the frequent occurrence of defects in outdoor GIS equipment. Indoor installation can effectively reduce problems caused by unqualified component materials, sealing processes, anti-corrosion measures, etc., effectively reduce the workload of defect elimination and maintenance, save manpower, material resources and financial resources, and reduce operation risks.

[0003] As of March 2020, the State Grid Corporation of China (referred to as the State Grid Corporation) had 6,712 intervals of GIS equipment in operation at 330 kV and above. Among them, 3,206 intervals were arranged outdoors (accounting for 81.60%); 723 intervals were arranged indoors (accounting for 18.40%). Statistical analysis of GIS equipment failures of the State Grid Corporation found that: from 2010 to 2019, a total of 64 failures occurred in GIS equipment at 330 kV and above in substations (converter stations). Among them, 6 failures occurred in indoor GIS equipment, with a failure rate of 0.16 failures / (hundred interval years), and 58 failures occurred in outdoor GIS equipment, with a failure rate of 0.35 failures / (hundred interval years). The failure rate of outdoor GIS equipment was 2.19 times that of indoor equipment. Statistical analysis of GIS equipment defects of the State Grid Corporation found that: in 2019, a total of 1,659 serious and critical defects occurred in GIS equipment at 110 kV and above of the State Grid Corporation. Among the serious defects, 671 occurred in indoor GIS equipment, with a defect rate of 1.44 defects / (hundred interval·years), and 786 occurred in outdoor GIS equipment, with a defect rate of 2.18 defects / (hundred interval·years); among the critical defects, 89 occurred in indoor GIS equipment, with a defect rate of 0.19 defects / (hundred interval·years), and 113 occurred in outdoor GIS equipment, with a defect rate of 0.31 defects / (hundred interval·years). The serious and critical defect rates of outdoor GIS were 1.5 times and 1.6 times that of outdoor GIS respectively.

[0004] The problems existing in currently operating outdoor GIS equipment are as follows:

[0005] 1. Leakage problems of outdoor GIS equipment. By counting the serious defects in the past 5 years, the SF6 gas leakage defects are the most, accounting for 77.94%. For example, after the commissioning of the 220kV GIS equipment in a 220kV ×× substation, the observation window of the disconnector is made of plexiglass. Being outdoors for a long time, it is aged and cracked after being exposed to sunlight and rain, resulting in gas leakage; for the 220kV GIS equipment in a 500kV ×× substation, which was commissioned in 2008, it was found that there were leaks at the casting holes of 5 pot-type insulators. After preliminary analysis, the reason for the gas leakage was that moisture invaded the sealing surface through the casting openings of the pot-type insulators, corroding the sealing surface and causing gas leakage.

[0006] 2. Rust problems of outdoor GIS equipment. In some areas, there is more rain or serious pollution. At the same time, the design materials and manufacturing processes of some manufacturers are poor, resulting in serious rust and corrosion problems of GIS equipment. For example, the 220kV GIS shell in a 220kV ×× substation is severely rusted; for the 220kV GIS equipment in a 220kV ×× substation, due to improper design and material selection by the manufacturer, the transmission connecting rod has poor corrosion resistance, and the on-site operating environment is relatively poor. After less than 4 years of operation, the transmission connecting rod of the disconnector is severely rusted, resulting in the failure of the disconnector to open / close.

[0007] 3. Problems in the control of outdoor GIS installation technology. It is difficult to effectively control the on-site installation environment of newly built or expanded outdoor GIS. During the equipment installation process, foreign matters such as moisture and dust are likely to enter the shell, resulting in a decline in the insulation performance of the GIS equipment and insulation breakdown during the handover withstand voltage test. For example, when installing the 220kV GIS in a 220kV ×× substation, a dust-proof tent was not set up, and the on-site installation environment management was not in place. During the handover withstand voltage test, due to foreign matters in the busbar branch pot-type insulator, surface flashovers occurred 3 times successively.

[0008] 4. Water ingress and moisture problems in the mechanism boxes and control cubicles of outdoor GIS. The sealing problems of the mechanism boxes and control cubicles of GIS equipment directly affect the reliable operation of the equipment. If the sealing measures of the mechanism boxes and control cubicles are not in place and moisture invades for a long time, it will lead to severe rusting of the transmission parts, damage to secondary components, jamming during operation, and in severe cases, the mechanism refuses to operate. For example, in a 110kV ×× substation, the internal metal parts of the disconnector mechanism box of the 110kV GIS equipment are severely rusted.

[0009] 5. Cracking problems of outdoor GIS support structures. Due to the significant impact of thermal expansion and contraction on outdoor GIS equipment, cracking at the welded joints of the main housing support structure and deformation of the expansion joints often occur. For example, in a 220kV GIS equipment at a 500kV ×× substation, cracks appeared at the support weld of the bus housing. A temperature compensation type expansion joint is installed on this bus housing to absorb small displacements of pipelines and equipment caused by thermal expansion and contraction or other external forces. After filling SF6 gas to the rated state, the expansion joint is in normal operation. The nuts on both sides of the double-headed screw should be loosened by about 10mm. However, the fastening bolts of the expansion joint were not loosened after installation. Under the action of thermal expansion and contraction, the support near the expansion joint cracked.

[0010] 6. Problems of outdoor GIS maintenance affected by weather. For planned maintenance of outdoor GIS, when opening the gas chamber, such as replacing pot-type insulators, sealing rings, etc., if it encounters rainy weather or the on-site air humidity exceeds the standard, the original maintenance plan will be forced to change, affecting the rigid implementation of the equipment power outage maintenance plan. When the air pressure in the outdoor GIS gas chamber is low and needs to be refilled with gas, or when internal faults occur in the operating GIS and it needs to be disassembled for maintenance, if the outdoor air humidity and dust do not meet the environmental requirements for GIS disassembly, it will seriously restrict the fault repair progress and maintenance quality. For example, in a 220kV GIS equipment at a 500kV ×× substation, at 7:12 on March 24, 2020, a fault occurred in the gas chamber of the 50222 disconnector. The high-end of Guquan Pole I and Pole II had two consecutive phase change failures, and the DC power of Jiquan decreased from the original 4.5 million kW to 3 million kW. Affected by the rainy weather, the 500kV Efan 5735 line was taken out of service until April 8.

[0011] 7. Problem of easy fading of outdoor GIS markings. During operation inspections, it was found that outdoor GIS equipment with an operation life of more than 3 years all had varying degrees of marking fading and peeling, which affected operation and on-site equipment management. For example, in a 220kV GIS equipment at a 220kV ×× substation, it was put into operation in 2008. During the inspection, it was found that the on / off indication had faded severely, and the closing indication marking had become blurred, seriously affecting the operation judgment of the operating personnel. The reason was that the on / off indication of this GIS equipment was always in the closed position during operation, and long-term sunlight caused the indication paint to fade.

[0012] 8. Water ingress and moisture absorption in the external secondary winding of outdoor GIS current transformers. Currently, some external GIS current transformers adopt the mode of external secondary windings. In some areas with relatively long rainy seasons, it is easy to cause the abnormal reduction of the insulation strength of the secondary winding. For example, since January 2016, in a 500kV GIS equipment at a certain UHV ×× substation, it has been found that the insulation strength of the secondary circuit of some external current transformers has decreased. After inspection, it was found that the secondary windings of some current transformers were severely waterlogged and affected by moisture.

[0013] In view of the above problems of outdoor GIS, in order to improve the operating environment of GIS equipment and solve the frequent air leakage problem at the flange connection of outdoor GIS equipment, a solution to improve the operating environment of GIS is proposed, and a GIS protective shed is added.

[0014] Most new substations are built indoors, which can effectively solve the corrosion of equipment in the substation, etc. However, there are still many substations built outdoors. Therefore, it is necessary to cover the roofs of these outdoor substations. There are difficulties such as power outage or live construction when covering the roofs of existing substations. Since the construction period of the roof is long, power outage operations greatly affect the power consumption of residents, and live construction also has relatively large safety hazards. Therefore, a protective shed that can be constructed safely and has no safety hazards is designed. Utility Model Content

[0015] In view of this, the purpose of the present utility model is to provide a substation protective shed that is convenient for maintenance.

[0016] Its technical solution is as follows:

[0017] A substation protective shed, the key points of which are: including a first support rail (2a) and a second support rail (2b) arranged in parallel between the bushings of the GIS combined electrical apparatus, and a plurality of moving roofs (3) that can move along the first support rail (2a) and the second support rail (2b) are installed side by side between the first support rail (2a) and the second support rail (2b); the plurality of moving roofs (3) can move to one side in sequence or move to both sides in sequence to expose the maintenance space.

[0018] With the above structure, as long as the live safety distance of the roof is set, the moving roof is installed within the safety distance, and then the installed moving roof is installed on the rail, and the movement of the moving roof is controlled. In this way, a plurality of moving roofs are installed in a cycle until the installation of the moving roofs is completed, so as to realize the installation of the protective shed for the existing substation. When a certain part needs to be maintained later, all the moving roofs on one side are moved to one side, and the part to be maintained can be quickly exposed, so as to facilitate maintenance or inspection. To a certain extent, it also plays a role in preventing entry into the live interval, with high safety.

[0019] Preferably: a row of first columns (1a) and a row of second columns (1b) are arranged between the bushings of the GIS combined electrical apparatus;

[0020] The upper end of each row of the first columns (1a) is fixed with a first support (1c) through a pressing block (16), and the first support rail (2a) is fixed on the upper end surface of the first support (1c);

[0021] At the upper end of each row of the second upright columns (1b), a second support (1d) is fixed through a pressing block (16), and the second support guide rail (2b) is fixed on the upper end surface of the second support (1d).

[0022] The above structure can achieve the reliable installation of the movable ceiling.

[0023] Preferably, fixed ceilings (9) are installed on the outer sides of the movable ceiling (3) at one or both ends. The fixed ceilings (9) are fixed through fixed supports (10). The lower end surface of the fixed ceiling (9) is higher than the upper end surface of the movable ceiling (3). Both the first support guide rail (2a) and the second support guide rail (2b) extend below the fixed ceiling (9). The movable ceiling (3) at the end can slide to directly below the fixed ceiling (9). The feature of setting the fixed ceiling is that when a certain part needs to be overhauled, the movable ceiling on one side of this part is moved outwards, and the outermost movable ceiling is moved below the fixed ceiling, so as to expose the part to be overhauled, which is convenient for overhaul. The position of the fixed ceiling is to reserve space for the movable ceiling during overhaul.

[0024] Preferably, guide driving mechanisms are provided on both sides of the movable ceiling (3). The guide driving mechanism includes a mounting plate (5) fixed under the movable ceiling (3). A traveling motor (6) is installed under this mounting plate (5). The output shaft of this traveling motor (6) is connected to a guide wheel (4), and this guide wheel (4) is located below the traveling motor (6). The guide wheels (4) on the same side are respectively located in the first support guide rail (2a) or the second support guide rail (2b), so that the stability of the guide driving mechanism can be increased.

[0025] Preferably, the movable ceiling (3) has a "human" - shaped structure. The outer end of the horizontal part of the mounting plate (5) is folded upwards, and the turning part of this folded part and the mounting plate (5) abuts against the movable ceiling (3). The outer end of the vertical part of the mounting plate (5) is folded inwards, and this folded part extends into the lower part of the first support guide rail (2a) or the second support guide rail (2b). With the above structure, the outer end of the horizontal part of the mounting plate is folded upwards, and the turning part of this folded part and the mounting plate abuts against the movable ceiling, and the two - line support is more reliable; at the same time, the outer end of the vertical part of the mounting plate is folded inwards and buckles on the lower part of the first support guide rail or the second support guide rail. In this way, even in extreme weather such as strong winds, the movable ceiling can be tightly installed on the track.

[0026] Preferably, diagonal braces (11) are fixed to both the first upright column (1a) and the second upright column (1b). The diagonal braces are provided to make the whole upright column more stable.

[0027] Preferably, the first support guide rail (2a) and the second support guide rail (2b) are both connected in sections, and limit cards are provided at the outer ends of the first support guide rail (2a) and the second support guide rail (2b) located at the ends;

[0028] A number of transverse supports (12) are fixed between the first support guide rail (2a) and the second support guide rail (2b).

[0029] Each moving ceiling (3) is equipped with an electric drum cable winder (20).

[0030] In this way, a reasonable layout of the lines can be achieved when the moving ceiling moves, and there is no interference of the lines when the moving ceiling moves.

[0031] Preferably, limit mechanisms are installed outside the guiding and driving mechanisms on the outer sides of the moving ceilings (3) near the ends. The limit mechanisms include two upper and lower fixing blocks (22) fixed on the first column (1a) or the second column (1b). A rotating rod (23) is vertically penetrated through the two fixing blocks (22). A limit block (24) is fixed at the upper end of the rotating rod (23). The limit block (24) is located outside the guiding and driving mechanism and can press against the guiding and driving mechanism. A rotating handle (25) is installed on the rotating rod (23) between the two fixing blocks (22). With the above structure, the outermost moving ceiling can be locked and fixed, and there will be no deficiencies such as gaps between adjacent moving ceilings.

[0032] Preferably, an upper guiding sealing groove (7a), a lower guiding sealing plate (7b), an upper limiting sliding groove (7c) and a lower limiting sliding groove (7d) located between the upper guiding sealing groove (7a) and the lower guiding sealing plate (7b) are provided on the outer sides of a row of the first columns (1a) and the second columns (1b). The upper guiding sealing groove (7a) is located below the moving ceiling (3), and the lower guiding sealing plate (7b) is located directly below the upper guiding sealing groove (7a). The upper limiting sliding groove (7c) and the lower limiting sliding groove (7d) located on the outer side of the first column (1a) are fixed on the outer side wall of the first column (1a), and the upper limiting sliding groove (7c) and the lower limiting sliding groove (7d) located on the outer side of the second column (1b) are fixed on the outer side wall of the second column (1b);

[0033] Moving side wall panels (71) are installed on both sides of the busbar branch of the bushing near the GIS combined electrical apparatus. The upper and lower ends of the moving side wall panels (71) are respectively located in the upper guiding and sealing grooves (7a) and the lower guiding and sealing plates (7b). Limiting pulleys (7e) are arranged on the inner side walls of the two moving side wall panels (71) corresponding to the upper limiting sliding grooves (7c) and the lower limiting sliding grooves (7d). The limiting pulleys (7e) are stuck in the upper limiting sliding grooves (7c) and the lower limiting sliding grooves (7d). Semi-circular holes or U-shaped grooves are arranged on the opposite sides of the two moving side wall panels (71). When the two moving side wall panels (71) are closed, the opposite semi-circular holes or U-shaped grooves are combined into a through hole for the busbar branch of the bushing of the GIS combined electrical apparatus to pass through.

[0034] Fixed side wall panels (7) are installed on the outer sides of the moving side wall panels (71) on both sides of the busbar branch of the bushing far from the GIS combined electrical apparatus. The upper and lower ends of the fixed side wall panels (7) are respectively located in the upper guiding and sealing grooves (7a) and the lower guiding and sealing plates (7b). The fixed side wall panels (7) are fixed to the upper limiting sliding grooves (7c) and the lower limiting sliding grooves (7d) through the vertical beams on the inner side.

[0035] When the moving side wall panels (71) are opened, the moving side wall panels (71) are located inside the fixed side wall panels (7). A toothed belt (7g) is arranged on the outer side wall of the moving side wall panels (71). An elastic sealing baffle (7f) is fixed to the fixed side wall panel (7) adjacent to the moving side wall panel (71). The elastic sealing baffle (7f) cooperates with the toothed belt (7g).

[0036] The moving side wall panels are provided to facilitate the maintenance of the equipment in the substation. Since the protective ceiling is designed according to the existing substation site, the layout of the existing equipment and the live safety distance need to be considered. Therefore, the construction space is limited. To facilitate the subsequent maintenance work, when a certain part needs to be maintained, the moving ceiling and the moving side wall panels of this part can be slid, which greatly facilitates the maintenance or inspection work. Adjacent to the two movable side wall panels are fixed side wall panels. The fixed ones are on the outside and are staggered with the movable side wall panels. By sliding open the two moving side wall panels, the side of the GIS interval for maintenance can be completely exposed, realizing unobstructed maintenance.

[0037] Preferably, touch switches are arranged between adjacent moving ceilings (3);

[0038] The canopy of the moving ceiling (3) is a rain drainage plate. When adjacent moving ceilings (3) touch each other, the rain shielding pieces of the adjacent rain drainage plates overlap;

[0039] Water guide grooves (8) that can be docked are arranged on the outer side walls of the moving side wall panels (71). The water guide grooves (8) are located directly below the outer ends of the moving ceilings (3).

[0040] Preferably, there are four fixed supports (10), two on the outer sides of the first support guide rail (2a) and two on the outer sides of the second support guide rail (2b). An opening assembly for fixing the ceiling is installed between the two fixed supports (10) at the ends.

[0041] The opening assembly includes an opening support (28). An opening door panel (29) is provided on the opening support (28). Opening fixing blocks (30) are provided on the fixed supports (10) on both sides of the opening door panel (29). Rotating pins (31) are fixed on both side walls of the opening door panel (29). The rotating pins (31) on the same side are inserted into the pin holes of the opening fixing blocks (30) to realize the rotation of the opening assembly. When the opening assembly is opened, it leans against the lower part of the transverse support (12). When the opening assembly is closed, the opening support (28) is locked by a locking block provided on the ground. A counterweight block (27) is also fixed to the lower part of the opening support (28).

[0042] Preferably, after being connected to a power source, the electric drum wire winder (20) is electrically connected to the traveling motor (6) and the lighting fixtures of each movable ceiling (3).

[0043] Preferably, the controllers of each movable ceiling (3) are configured on the same remote controller. The remote controller is provided with left and right shift buttons for each movable ceiling (3), and drives the traveling motor (6) of the corresponding movable ceiling (3) through different wireless encodings.

[0044] Preferably, solar panels are laid on the movable ceiling (3) and the fixed ceiling (9).

[0045] Beneficial effects: It can build a protective shed according to the characteristics of the existing outdoor substation, effectively solve the problems of live or partially powered-off operations. At the same time, this protective shed can effectively prevent the corrosion and aging of substation equipment; considering the economic cost, it solves the problems of equipment maintenance or inspection in the narrow space inside the protective shed. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic structural diagram of a protective shed for an in-use substation;

[0047] Figure 2 It is Figure 1 a cross-sectional view of the end;

[0048] Figure 3 It is Figure 2 an enlarged schematic view of part A in;

[0049] Figure 4 It is a limit structure diagram of the movable ceiling at the end of the protective shed for an in-use substation;

[0050] Figure 5 Schematic diagram of the open state of the end of the substation protection shed in use;

[0051] Figure 6 Schematic diagram of the end frame structure of the substation protection shed in use;

[0052] Figure 7a External perspective schematic diagram of the side wall panel installation structure;

[0053] Figure 7b Internal perspective schematic diagram of the side wall panel installation structure;

[0054] Figure 8 Layout diagram of the controller. Specific implementation manners

[0055] The present utility model will be further described below in conjunction with embodiments and the drawings.

[0056] Existing substations include high frameworks, GIS combined electrical appliances, sleeves of GIS combined electrical appliances and other equipment. As Figures 1 to 5 shown, a substation protection shed is shown, which includes a row of first columns 1a and a row of second columns 1b respectively installed between the sleeves of the GIS combined electrical appliances. In order to make the first columns 1a and the row of second columns 1b more stable, inclined supports 11 are fixed to both the first columns 1a and the row of second columns 1b. The upper end faces of all the first columns 1a are flush, and the upper end faces of all the second columns 1b are flush. A first support 1c is fixed to the upper end of each row of the first columns 1a through a pressing block 16. The first support 1c is an I-beam. After the lower part of the first support 1c passes through the gap between the pressing block 16 and the upper end face of the first column 1a, the pressing block 16 is locked by screws to realize the fastening of the first support 1c, and then a first support guide rail 2a is fixed on the first support 1c; a second support 1d is fixed to the upper end of each row of the second columns 1b through a pressing block 16. The second support 1d is also of I-beam structure. After the lower part of the second support 1d passes through the gap between the pressing block 16 and the upper end face of the second column 1b, the pressing block 16 is locked by screws to realize the fastening of the second support 1d, and then a second support guide rail 2b is fixed on the second support 1d; a plurality of movable ceilings 3 capable of moving along the first support guide rail 2a and the second support guide rail 2b are installed side by side between the first support guide rail 2a and the second support guide rail 2b; the plurality of movable ceilings 3 can move to one side in sequence or move to both sides in sequence to expose the maintenance space.

[0057] Combined with Figure 2 and Figure 3It can be seen that the movable ceiling 3 is in a "V" - shaped structure. Guide driving mechanisms are arranged near the four corners on both sides of the movable ceiling 3. The guide driving mechanism includes a mounting plate 5 fixed under the movable ceiling 3. A traveling motor 6 is mounted under the mounting plate 5. The output shaft of the traveling motor 6 is connected to a guide wheel 4, and the guide wheel 4 is located below the traveling motor 6. One side of the guide wheel 4 is located in the first support rail 2a, and the guide wheel 4 on the other side is located in the second support rail 2b. The mounting plate 5 is in a "7" - shaped structure. The outer end of the horizontal part of the mounting plate 5 is turned up, and the turning part and the turning point of the mounting plate 5 abut against the movable ceiling 3. The outer end of the vertical part of the mounting plate 5 is turned inwards, and the turned - in part extends into the lower part of the first support rail 2a or the second support rail 2b.

[0058] Please refer to Figures 4 to 6 : A fixed ceiling 9 is installed outside the movable ceiling 3 at one or both ends. The fixed ceiling 9 is fixed by a fixed support 10. The lower end face of the fixed ceiling 9 is higher than the upper end face of the movable ceiling 3. Both the first support rail 2a and the second support rail 2b extend under the fixed ceiling 9. The movable ceiling 3 at the end can slide to directly below the fixed ceiling 9. Both the first support rail 2a and the second support rail 2b are connected in sections. Limit cards are provided at the outer ends of the first support rail 2a and the second support rail 2b at the end. When the movable ceiling 3 slides to below the fixed ceiling 9, the limit cards can prevent the movable ceiling 3 from sliding out of the track. A number of transverse supports 12 are fixed between the first support rail 2a and the second support rail 2b. Each movable ceiling 3 is equipped with an electric drum wire winder 20. The installation method of the electric drum wire winder 20 is prior art and can be installed according to on - site conditions and requirements. It can also be installed in the following way: a limiting ball or other components that can be used for limiting are provided at the end of the wire pulled out by the electric drum wire winder 20, and the limiting component is snapped into a corresponding card slot or a hooked U - shaped groove provided on the adjacent movable ceiling 3. The structure here can also be designed according to requirements. Under the tension of the electric drum wire winder 20, as long as it can be clamped, there are no structural restrictions. If necessary, the restriction on the wire of the electric drum wire winder 20 can also be manually released, and all the wires will automatically retract into the electric drum wire winder 20 to facilitate hoisting operations. The electric drum wire winder 20 is connected to two groups of power supplies: one group of power supplies is electrically connected to the traveling motor 6 of each movable ceiling 3, and at the same time drives the fixed sound and light alarm in the shed to warn personnel that the movable ceiling 3 may move at any time; the other group of power supplies is electrically connected to the lighting fixtures in the movable ceiling 3, and when powered on, it provides lighting for the entire protective shed interior.

[0059] Please refer to Figure 4:A limiting mechanism is installed outside the guiding and driving mechanisms on the outer side of the moving ceiling 3 near the end. The limiting mechanism includes two upper and lower fixing blocks 22 fixed on the first upright column 1a or the second upright column 1b. A rotating rod 23 is vertically penetrated through the two fixing blocks 22. A limiting block 24 is fixed at the upper end of the rotating rod 23. The limiting block 24 is located outside the guiding and driving mechanism and can press the guiding and driving mechanism. A rotating handle 25 is installed on the rotating rod 23 between the two fixing blocks 22.

[0060] Please refer to Figures 1 - 3 and Figure 7a and Figure 7b: The shed cover of the movable roof 3 is a rain-draining plate. When adjacent movable roofs 3 touch each other, the rain-blocking pieces on the rain-draining plate are warped on one side and curled on the other side, and are buckled with each other. The overlapping of the rain-blocking pieces of adjacent rain-draining plates can achieve leakage prevention between adjacent movable roofs 3; on the outer sides of both the first upright columns 1a and the second upright columns 1b in a row, an upper guiding and sealing groove 7a, a lower guiding and sealing plate 7b, an upper limiting sliding groove 7c and a lower limiting sliding groove 7d located between the upper guiding and sealing groove 7a and the lower guiding and sealing plate 7b are provided. The upper guiding and sealing groove 7a is a structural profile with an "E"-shaped cross-section, and the groove opening faces downward, and is fixed below the movable roof 3. The lower guiding and sealing plate 7b is located directly below the upper guiding and sealing groove 7a. The lower guiding and sealing plate 7b is an angle steel structure. A low wall is built between the lower guiding and sealing plate 7b and the ground, and its function is to prevent rainwater drainage from seeping back into the wall panel and causing corrosion. The upper limiting sliding groove 7c and the lower limiting sliding groove 7d located on the outer side of the first upright column 1a are fixed on the outer side wall of the first upright column 1a, and the upper limiting sliding groove 7c and the lower limiting sliding groove 7d located on the outer side of the second upright column 1b are fixed on the outer side wall of the second upright column 1b. The upper limiting sliding groove 7c and the lower limiting sliding groove 7d are both composed of two channel steels with opposite groove openings, thus forming a sliding groove capable of guiding and limiting; on both sides of the busbar of the sleeve of the GIS combined electrical apparatus, movable side wall panels 71 are installed. The upper and lower ends of the movable side wall panel 71 are respectively located in the upper guiding and sealing groove 7a and the lower guiding and sealing plate 7b. The upper guiding and sealing groove 7a can play a role in guiding and sealing. Since the lower guiding and sealing plate 7b is an angle steel structure, the lower end of the side wall panel 7 is located above the horizontal part of the lower guiding and sealing plate 7b, and the vertical part is located inside the side wall panel 7, thus playing a role in sealing. On the inner side walls of the two movable side wall panels 71, limiting pulleys 7e are correspondingly provided, and the limiting pulleys 7e are stuck in the upper limiting sliding groove 7c and the lower limiting sliding groove 7d. On the opposite sides of the two movable side wall panels 71, semi-circular holes or U-shaped grooves are provided. When the two movable side wall panels 71 are closed, the opposite semi-circular holes or U-shaped grooves are combined into a through hole through which the busbar of the sleeve of the GIS combined electrical apparatus passes; for the three-phase separated branch busbars, filling blocks are provided to seal the inter-phase cavities; on the outer sides of the movable side wall panels 71 on both sides of the busbar of the sleeve of the GIS combined electrical apparatus far away from the GIS combined electrical apparatus, fixed side wall panels 7 are installed. The upper and lower ends of the fixed side wall panel 7 are respectively located in the upper guiding and sealing groove 7a and the lower guiding and sealing plate 7b. The fixed side wall panel 7 is fixed to the upper limiting sliding groove 7c and the lower limiting sliding groove 7d through the vertical beams on the inner side; when the movable side wall panel 71 is opened, the movable side wall panel 71 is located inside the fixed side wall panel 7. A toothed belt 7g is provided on the outer side wall of the movable side wall panel 71, and an elastic sealing baffle 7f is fixed to the fixed side wall panel 7 adjacent to the movable side wall panel 71, and the elastic sealing baffle 7f cooperates with the toothed belt 7g.

[0061] AtFigure 2 In FIGS. 6 and 7: A touch switch is provided between adjacent movable ceilings 3; the shed cover of the movable ceiling 3 is a rain drainage plate, and when adjacent movable ceilings 3 touch each other, the rain shielding pieces of adjacent rain drainage plates overlap; on the outer side walls of the movable side wall panels 71, water guide grooves 8 that can be docked are provided, and the water guide grooves 8 are located directly below the outer ends of the movable ceilings 3.

[0062] Of course, in addition to the above installation method, fixed wall panels can also be uniformly installed below the movable ceiling 3 and the fixed ceiling 9, and the structure of the fixed wall panels can be designed. For example, slots can be opened on the fixed wall panels to achieve maintenance. It is also possible to design the fixed wall panels below the fixed ceiling 9 and the fixed wall panels below the movable ceiling 3 to be on the same plane, that is, the fixed ceiling 9 protrudes from the plane of the fixed wall panels, and the cross section is in the shape of a mushroom.

[0063] Please refer to Figure 5 and Figure 6 : The number of the fixed supports 10 is four, two are located outside the first support guide rail 2a, and two are located outside the second support guide rail 2b. An opening assembly of the fixed ceiling is installed between the two fixed supports 10 at the ends; the opening assembly includes an opening support 28, an opening door panel 29 is provided on the opening support 28, opening fixing blocks 30 are provided on the fixed supports 10 on both sides of the opening door panel 29, and rotating pins 31 are fixed on both side walls of the opening door panel 29. The rotating pins 31 on the same side are inserted into the pin holes of the opening fixing blocks 30 to realize the rotation of the opening assembly. When the opening assembly is opened, it leans against the lower part of the horizontal support 12. When the opening assembly is closed, the opening support 28 is locked by a locking block arranged on the ground, and a counterweight block 27 is also fixed at the lower part of the opening support 28.

[0064] Please refer to Figure 8 : The controllers of each movable ceiling 3 are configured on the same remote control. The remote control is provided with left and right movement buttons for each movable ceiling 3, and the traveling motors 6 of the corresponding movable ceilings 3 are driven through different wireless encodings.

[0065] Figure 1 In: Solar panels are laid on the movable ceiling 3 and the fixed ceiling 9, and relevant energy storage devices are arranged in the shed, which can supply power to the devices in the shed.

[0066] After the protective shed is built:

[0067] 1. Reduce the defect rate; Analysis shows that the main reason for the frequent defects of outdoor GIS equipment is that although GIS equipment is designed for outdoor operation, it cannot meet the long-term outdoor operation conditions due to many reasons such as design level, component material, and installation process. With the advancement of industrialization, the increasingly serious environmental pollution has accelerated the aging and corrosion of outdoor equipment. GIS operating outdoors is in an environment with high moisture and salt content and large temperature changes. Metals such as aluminum and iron rust or react with galvanic cells due to moisture and salt distribution. Protective paints, sealing gaskets, etc. age under the action of sunlight and moisture for a long time and gradually lose their protective effects. The resulting equipment function defects are the main problems of outdoor equipment. GIS operating indoors basically does not have such problems caused by environmental reasons. Therefore, the key to reducing the number of GIS equipment defects is to improve the operating environment of outdoor GIS equipment. In order to reduce the defect rate of GIS equipment, eliminate the impact of the operating environment on GIS equipment, and improve the safety and stability of equipment and power grids, it is necessary to install protective sheds for outdoor equipment and thoroughly improve the operating environment of GIS equipment.

[0068] 2. Ensure the safe operation of the power grid; according to statistics, taking Shandong Power Grid as an example, before the construction of the protective shed, there were 15 power outages in 2013 to repair outdoor GIS defects, accounting for 79% of the GIS defect treatment. Due to the special structure of GIS equipment, disassembly maintenance requires at least 3 days, the required power outage range is large, the maintenance time is long, and the equipment disassembly, vacuuming, SF6 gas quiescence, etc. have strict environmental and time requirements. Some disassembly maintenance requires two busbars to be shut down at the same time, which can easily lead to a power outage of the entire station, greatly threatening the safe and stable operation of the power grid during the power outage maintenance.

[0069] 3. Reduce the comprehensive operation and maintenance costs; Frequent troubleshooting work brings great pressure to the equipment operation and maintenance work, and consumes a lot of manpower, material and financial costs. Taking the 220kV×× substation as an example, the 220kV outdoor GIS was supplemented with SF6 gas 62 times before the installation of the protective shed, with a total of about 3,580kg of gas, a total of about 72 bottles (50kg / bottle), 1 bottle of gas is calculated at 11,000 yuan, and the total gas cost is 792,000 yuan; the vehicle cost is calculated at 320 yuan each time, and the total cost is 19,800 yuan; 3 people are required each time, and the labor cost is 375 yuan / person-time according to the project quota, and the total cost is 69,750 yuan. From 2005 to 2009, the total cost of labor, vehicles and gas was about 881,600 yuan. After the replacement and installation of the protective shed, SF6 gas was supplemented 3 times in total, with about 30kg of gas supplemented. From 2010 to 2013, the total cost of labor, vehicles and gas was about 11,000 yuan. From the above comparison, it can be seen that the maintenance cost is greatly reduced.

[0070] 4. Protected the environment; SF6 gas has excellent insulation and arc extinguishing performance and has long been widely used in high-voltage electrical equipment. Among them, the amount of SF6 gas used in GIS equipment is the largest. However, since the greenhouse effect of its single molecule is 2390 times that of CO2 and it can stably exist in the air for 3200 years, it has attracted more and more widespread attention from all sectors of society and has been listed as one of the six greenhouse gases prohibited from emission in the Kyoto Protocol. Installing a protective shed for outdoor GIS equipment can effectively reduce the gas leakage defects of the equipment, reduce the emission of SF6 gas, save resource consumption, and lay a solid foundation for the State Grid Corporation of China's "controlling greenhouse gas emissions and promoting the construction of a green power grid".

[0071] Finally, it should be noted that the above description is only the preferred embodiment of the present utility model. Those of ordinary skill in the art can make various similar representations under the inspiration of the present utility model without violating the purpose and claims of the present utility model. Such transformations all fall within the protection scope of the present utility model.

Claims

1. A substation protection shed, characterized in that: It includes a first support rail (2a) and a second support rail (2b) arranged in parallel between the bushings of the GIS combined electrical apparatus. A plurality of moving ceilings (3) capable of moving along the first support rail (2a) and the second support rail (2b) are installed side by side between the first support rail (2a) and the second support rail (2b); the plurality of moving ceilings (3) can move to one side in sequence or move to both sides in sequence so as to expose the maintenance space.

2. The substation protection shed according to claim 1, wherein: A row of first columns (1a) and a row of second columns (1b) are arranged between the bushings of the GIS combined electrical apparatus; At the upper end of each row of the first columns (1a), a first support (1c) is fixed through a pressing block (16), and the first support rail (2a) is fixed on the upper end face of the first support (1c); At the upper end of each row of the second columns (1b), a second support (1d) is fixed through a pressing block (16), and the second support rail (2b) is fixed on the upper end face of the second support (1d).

3. The substation protection shed according to claim 2, characterized in that: A fixed ceiling (9) is installed outside the moving ceiling (3) at one or both ends. The fixed ceiling (9) is fixed through a fixed support (10). The lower end face of the fixed ceiling (9) is higher than the upper end face of the moving ceiling (3). Both the first support rail (2a) and the second support rail (2b) extend below the fixed ceiling (9). The moving ceiling (3) at the end can slide to directly below the fixed ceiling (9).

4. A substation protection shed according to claim 3, characterized in that: Guiding and driving mechanisms are arranged on both sides of the moving ceiling (3). The guiding and driving mechanism includes a mounting plate (5) fixed under the moving ceiling (3). A traveling motor (6) is installed under the mounting plate (5). The output shaft of the traveling motor (6) is connected to a guiding wheel (4), and the guiding wheel (4) is located below the traveling motor (6). The guiding wheels (4) on the same side are respectively located in the first support rail (2a) or the second support rail (2b).

5. The substation protection shed according to claim 4, wherein: The moving ceiling (3) is in a "person" - shaped structure. The outer end of the horizontal part of the mounting plate (5) is turned up, and the turning part at the turning point of the mounting plate (5) abuts against the moving ceiling (3). The outer end of the vertical part of the mounting plate (5) is turned inwards, and the turning part extends into the lower part of the first support rail (2a) or the second support rail (2b).

6. The substation protection shed according to claim 4, wherein: Both the first columns (1a) and the second columns (1b) are fixed with inclined supports (11).

7. A substation protection shed according to claim 4, characterized in that: Both the first support rail (2a) and the second support rail (2b) are formed by segmented connection. Limit cards are arranged at the outer ends of the first support rail (2a) and the second support rail (2b) at the end. A plurality of transverse supports (12) are fixed between the first support rail (2a) and the second support rail (2b); Each moving ceiling (3) is equipped with an electric drum cable winder (20).

8. A substation protection shed according to claim 4, characterized in that: A limiting mechanism is installed outside the guiding and driving mechanism on the outer side of the moving ceiling (3) near the end. The limiting mechanism includes two upper and lower fixing blocks (22) fixed on the first upright column (1a) or the second upright column (1b). A rotating rod (23) is vertically penetrated through the two fixing blocks (22). A limiting block (24) is fixed at the upper end of the rotating rod (23). The limiting block (24) is located outside the guiding and driving mechanism and can press the guiding and driving mechanism. A rotating handle (25) is installed on the rotating rod (23) between the two fixing blocks (22).

9. A substation protective shed according to claim 3, characterized in that: An upper guiding sealing groove (7a), a lower guiding sealing plate (7b), an upper limiting sliding groove (7c) and a lower limiting sliding groove (7d) located between the upper guiding sealing groove (7a) and the lower guiding sealing plate (7b) are arranged on the outer sides of a row of the first upright columns (1a) and the second upright columns (1b). The upper guiding sealing groove (7a) is located below the moving ceiling (3). The lower guiding sealing plate (7b) is located directly below the upper guiding sealing groove (7a). The upper limiting sliding groove (7c) and the lower limiting sliding groove (7d) located on the outer side of the first upright column (1a) are fixed on the outer side wall of the first upright column (1a). The upper limiting sliding groove (7c) and the lower limiting sliding groove (7d) located on the outer side of the second upright column (1b) are fixed on the outer side wall of the second upright column (1b). Moving side wall plates (71) are installed on both sides of the busbar of the sleeve of the GIS combined electrical apparatus near the busbar of the sleeve. The upper and lower ends of the moving side wall plates (71) are respectively located in the upper guiding sealing groove (7a) and the lower guiding sealing plate (7b). Limiting pulleys (7e) corresponding to the upper limiting sliding groove (7c) and the lower limiting sliding groove (7d) are arranged on the inner side walls of the two moving side wall plates (71). The limiting pulleys (7e) are stuck in the upper limiting sliding groove (7c) and the lower limiting sliding groove (7d). Semi-circular holes or U-shaped grooves are arranged on the opposite sides of the two moving side wall plates (71). When the two moving side wall plates (71) are closed, the opposite semi-circular holes or U-shaped grooves are combined into a through hole for the busbar of the sleeve of the GIS combined electrical apparatus to pass through. Fixed side wall plates (7) are installed on the outer sides of the moving side wall plates (71) on both sides of the busbar of the sleeve of the GIS combined electrical apparatus far from the busbar of the sleeve. The upper and lower ends of the fixed side wall plates (7) are respectively located in the upper guiding sealing groove (7a) and the lower guiding sealing plate (7b). The fixed side wall plates (7) are fixed to the upper limiting sliding groove (7c) and the lower limiting sliding groove (7d) through vertical beams on the inner side. When the moving side wall plates (71) are opened, the moving side wall plates (71) are located inside the fixed side wall plates (7). A toothed belt (7g) is arranged on the outer side wall of the moving side wall plates (71). An elastic sealing baffle (7f) is fixed on the fixed side wall plate (7) adjacent to the moving side wall plate (71). The elastic sealing baffle (7f) cooperates with the toothed belt (7g).

10. A substation protective shed according to claim 9, characterized in that: Touch switches are arranged between adjacent moving ceilings (3). The canopy of the movable canopy (3) is a rain-draining plate. When adjacent movable canopies (3) touch each other, the rain-blocking pieces of adjacent rain-draining plates overlap. On the outer side walls of the movable side wall panels (71), water guide grooves (8) that can be docked are provided. The water guide grooves (8) are located directly below the outer ends of the movable canopies (3).

11. A substation protective shed according to claim 7, characterized in that: The number of the fixed supports (10) is four. Two are located on the outer sides of the first support guide rails (2a), and two are located on the outer sides of the second support guide rails (2b). An opening assembly for the fixed canopy is installed between the two fixed supports (10) at the ends. The opening assembly includes an opening support (28). An opening door panel (29) is provided on the opening support (28). Opening fixing blocks (30) are provided on the fixed supports (10) on both sides of the opening door panel (29). Rotating pins (31) are fixed on both side walls of the opening door panel (29). The rotating pins (31) on the same side are inserted into the pin holes of the opening fixing blocks (30) to realize the rotation of the opening assembly. When the opening assembly is opened, it leans against the lower part of the transverse support (12). When the opening assembly is closed, the opening support (28) is locked by a locking block provided on the ground. A counterweight block (27) is also fixed to the lower part of the opening support (28).

12. A substation protective shed according to claim 7, characterized in that: After being connected to a power source, the electric drum wire winder (20) is electrically connected to the traveling motors (6) and lighting fixtures of each movable canopy (3).

13. A substation protective shed according to claim 12, characterized in that: The controllers of each movable canopy (3) are configured on the same remote controller. The remote controller is provided with left and right movement buttons for each movable canopy (3), and drives the traveling motors (6) of the corresponding movable canopies (3) through different wireless encodings.

14. A substation protective shed according to claim 3, characterized in that: Solar panels are laid on the movable canopies (3) and the fixed canopy (9).

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