Adjustable end-cover for gas insulated switchgear

Abstract

The present invention relates to an end cover for a gas-insulated switchgear, comprising a coupling portion having one end in the longitudinal direction open and coupled to the end of the gas-insulated switchgear, and a length-adjusting bellows connected to the other end in the longitudinal direction of the coupling portion and having a wavy corrugation repeatedly formed along the longitudinal direction, thereby enabling compatibility between a conventional gas-insulated switchgear and a new gas-insulated switchgear.

Description

Technology Field

[0001] The present invention relates to an end cover for a gas-insulated switchgear, and more specifically, to an end cover for a gas-insulated switchgear that is compatible between an older type of gas-insulated switchgear and a newer type of gas-insulated switchgear. Background Technology

[0003] A Gas Insulated Switchgear (GIS) is a primary protection device for power facilities that protects the power system by interrupting the current during normal switching and abnormal situations.

[0004] This is constructed by housing major equipment of a substation, such as circuit breakers, disconnectors, grounding switches, instrument transformers, current transformers, busbars, and lightning arresters, in an enclosure, and filling and sealing it with SF6 gas, which has excellent insulation and arc extinguishing characteristics, as an insulating medium.

[0005] Among them, the GIS facility is operated by combining multiple sections into a Gas Insulated Bus (GIB) form. An end cover capable of opening and closing the GIB is located at the end of the GIB. During a long-term shutdown due to internal work such as GIS repair or facility replacement, the above end cover must be relocated.

[0006] However, since the end diameters and lengths of the old and new GIBs differ, there was a problem in that the end covers of the old and new models were not compatible. Consequently, there was a problem where unnecessary power outage time was extended due to the procurement and transportation of end covers suitable for each diameter. The problem to be solved

[0008] The problem that the present invention aims to solve is to provide an end cover for a gas-insulated switchgear that solves the problems of the aforementioned prior art. Specifically, it provides an end cover for a gas-insulated switchgear that is compatible between a conventional gas-insulated switchgear and a new gas-insulated switchgear.

[0009] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0011] To solve the above technical problem, an end cover for a gas-insulated switchgear according to an embodiment of the present invention may include: a coupling part having one end in the longitudinal direction open and coupled to the end of the gas-insulated switchgear; and a length-adjusting bellows connected to the other end in the longitudinal direction of the coupling part and having a wavy corrugation repeatedly formed along the longitudinal direction.

[0013] In addition, the end cover for a gas-insulated switchgear according to an embodiment of the present invention may include a diameter-adjusting bellows in which wavy folds are repeatedly formed along the outer surface of the coupling portion.

[0014] And, it may include a belt portion that wraps around the outer surface of the above-mentioned diameter adjustment bellows.

[0015] Meanwhile, the end cover for a gas-insulated switchgear according to an embodiment of the present invention may further include a gearbox that is coupled to the belt portion and adjusts the diameter.

[0016] Additionally, it may further include a pair of flange portions formed to protrude radially outward from both sides in the longitudinal direction of the length-adjustable bellows; and a guide bolt connecting the pair of flange portions.

[0017] Furthermore, it may further include a gearbox that is coupled with the guide bolt to adjust the length. Effects of the invention

[0019] According to the end cover for a gas-insulated switchgear of the present invention, one or more of the following effects are provided.

[0020] According to the present invention, the length and diameter can be adjusted, thereby ensuring compatibility between new and old gas-insulated switchgear. Brief explanation of the drawing

[0022] FIG. 1 is a side view of an end cover for a gas-insulated switchgear according to one embodiment of the present invention. FIG. 2 is a drawing showing a state in which a belt portion and a guide bolt are mounted on an end cover for a gas-insulated switchgear according to one embodiment of the present invention. FIG. 3 is a drawing showing the end cover for a gas-insulated switchgear according to one embodiment of the present invention in a state where the length is extended and the diameter is enlarged. FIG. 4 is a drawing showing the state in which an end cover for a gas-insulated switchgear according to one embodiment of the present invention is installed on a new type and a spherical type gas-insulated switchgear, respectively. Specific details for implementing the invention

[0023] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0025] FIG. 1 is a side view of an end cover for a gas-insulated switchgear according to an embodiment of the present invention, FIG. 2 is a drawing showing a state in which a belt portion and a guide bolt are mounted on an end cover for a gas-insulated switchgear according to an embodiment of the present invention, FIG. 3 is a drawing showing a state in which the length of an end cover for a gas-insulated switchgear according to an embodiment of the present invention is extended and the diameter is enlarged, FIG. 4 is a drawing showing a state in which an end cover for a gas-insulated switchgear according to an embodiment of the present invention is installed on a new type and a spherical type gas-insulated switchgear, respectively.

[0027] The present invention will be described with reference to FIGS. 1 to 4. An end cover (1) for a gas-insulated switchgear according to an embodiment of the present invention includes a coupling part (10), a length-adjustable bellows (20), and an end part (30).

[0029] First, the connecting part (10) is a part that is connected to the end of the gas-insulated switchgear, and one end in the longitudinal direction is open, and the other end in the longitudinal direction can be connected to a length-adjusting bellows (20). The open part and the end of the gas-insulated switchgear can be connected. When the connecting part (10) and the end of the switchgear are connected, the inside of the gas-insulated switchgear and the inside of the end cover (1) for the gas-insulated switchgear can be in communication. The shape of the connecting part (10) can be formed to correspond to the shape of the end of the gas-insulated switchgear. For example, if the end of the gas-insulated switchgear is a cylindrical shape with one side open, the connecting part (10) can also be a cylindrical shape with one side open corresponding to this.

[0031] Additionally, although not shown in the drawing, the coupling portion (10) may further include a rubber packing (11). The rubber packing (11) may be placed on the inner circumference of the coupling portion (10). Alternatively, the rubber packing (11) may be placed along the end of the open portion of the coupling portion (10). The rubber packing (11) can seal the coupled portion when the coupling portion (10) is coupled to a gas-insulated switchgear. Accordingly, it is possible to prevent gas inside the gas-insulated switchgear from leaking.

[0033] Additionally, the end cover (1) for the gas-insulated switchgear may include a length-adjustable bellows (20). The length-adjustable bellows (20) may be cylindrical in shape, formed such that wavy folds are repeated along the longitudinal direction on the outer surface. Accordingly, the end cover (1) for the gas-insulated switchgear may contract or expand in the longitudinal direction. The length-adjustable bellows (20) may be connected to the other end in the longitudinal direction of the coupling part (10). That is, one end of the length-adjustable bellows (20) is connected to the coupling part (10), and the other end may be connected to the end part (30). When the length-adjustable bellows (20) contracts, the distance between the coupling part (10) and the end part (30) decreases, and when the length-adjustable bellows (20) expands, the distance between the coupling part (10) and the end part (30) increases.

[0035] The end portion (30) can be formed such that one end is connected to the length-adjusting bellows (20) and the other end is closed. Accordingly, the end portion (30) can seal the internal gas of the gas-insulated switchgear. Additionally, the position of the end portion (30) can change according to the extension and contraction of the length-adjusting bellows (20).

[0037] Hereinafter, a length adjustment method for an end cover (1) for a gas-insulated switchgear according to one embodiment of the present invention will be described in detail. In this regard, the end cover (1) for a gas-insulated switchgear further includes a pair of flange portions (50) and guide bolts (70).

[0039] First, a pair of flange portions (50) may be formed to protrude radially outward from both sides in the longitudinal direction of the length-adjusting bellows (20).

[0040] For example, a pair of flange portions (50) may be plate-shaped, with a cylindrical length-adjusting bellows (20) accommodated in the center. According to one embodiment of the present invention, the pair of flange portions (50) may be disc-shaped. Additionally, the pair of flange portions (50) may further include a bolt hole (51) that accommodates a guide bolt (70). According to one embodiment of the present invention, a plurality of bolt holes (51) may be formed along the circumference of the pair of flange portions (50).

[0042] The guide bolt (70) can connect the pair of flange portions (50) to guide the extension and contraction of the length-adjustable bellows (20). The guide bolt (70) may be a threaded rod with threads formed on its outer surface. The guide bolt (70) may penetrate the pair of flange portions (50) vertically. That is, the guide bolt (70) may be formed to extend along the longitudinal direction of the end cover (1) for the gas-insulated switchgear.

[0043] The guide bolt (70) can be received in the bolt hole (51). That is, the guide bolt (70) can be received in the bolt hole (51) of one flange portion (50) and simultaneously received in the bolt hole (51) of another flange portion (50) to connect the pair of flange portions (50).

[0044] The guide bolt (70) may include a nut (71). A nut (71) may be positioned at each end of the guide bolt in the longitudinal direction. A pair of flange portions (50) may be positioned between the pair of nuts (71). That is, the guide bolt (70) may be joined in the order of nut (71), flange portion (50), flange portion (50), and nut (71) along the longitudinal direction. When the nut (71) is tightened, the distance between the pair of flange portions (50) decreases, and when the nut (71) is loosened, the distance between the pair of flange portions (50) increases.

[0046] Meanwhile, according to one embodiment of the present invention, the end cover (1) for a gas-insulated switchgear may further include a gearbox (80). The gearbox (80) may be coupled to one end in the longitudinal direction of the guide bolt (70). The gearbox (80) may operate the nut (71). For example, power may be supplied to the gearbox (80) to operate the nut (71).

[0047] The operator can adjust the length of the end cover (1) for the gas-insulated switchgear by operating the nut (71) through the gearbox (80).

[0048] For example, the length of the end portion of the new type of gas-insulated switchgear may be longer than the length of the end portion of the old type of gas-insulated switchgear. At this time, the nut (71) can be loosened by operating the gearbox (80). When the nut (71) is loosened, the distance between a pair of flange portions (50) may increase. Accordingly, the length-adjusting bellows (20) placed between the pair of flange portions (50) may be extended. Accordingly, the length of the end cover (1) for the gas-insulated switchgear can be adjusted to match the length of the end portion of the new type of gas-insulated switchgear.

[0049] Meanwhile, the length of the end portion of the old gas-insulated switchgear may be shorter than the length of the end portion of the new gas-insulated switchgear. At this time, the nut (71) can be tightened by operating the gearbox (80). When the nut (71) is tightened, the distance between the pair of flange portions (50) may be reduced. Accordingly, the length-adjusting bellows (20) placed between the pair of flange portions (50) may be retracted. Accordingly, the length of the end cover (1) for the gas-insulated switchgear can be adjusted to match the length of the end portion of the old gas-insulated switchgear.

[0051] Hereinafter, a method for adjusting the diameter of an end cover (1) for a gas-insulated switchgear according to one embodiment of the present invention will be described in detail. In this regard, the end cover (1) for a gas-insulated switchgear may further include a diameter-adjusting bellows (40) and a belt portion (60).

[0053] First, the diameter adjustment bellows (40) may be formed along the outer surface of the coupling part (10). More specifically, the diameter adjustment bellows (40) may have repeated wavy folds formed along the outer surface of the coupling part (10) so that the diameter can be reduced or increased.

[0055] A belt portion (60) may be provided to wrap around the outer surface of the above-mentioned diameter adjustment bellows (40). The belt portion (60) is formed in a strip shape and is formed to be in close contact with both ends spaced apart. As the portion where one end of the belt portion (60) overlaps with the other end becomes longer, the inner diameter of the belt portion (60) decreases, and conversely, as the overlapping portion becomes shorter, the inner diameter of the belt portion (60) may increase.

[0056] When the inner diameter of the belt portion (60) decreases, the diameter adjustment bellows (40) wrapped by the belt portion (60) may contract. Accordingly, the diameter of the end cover (1) for the gas-insulated switchgear may decrease. On the other hand, when the inner diameter of the belt portion (60) increases, the diameter adjustment bellows (40) may expand due to the elasticity of the material. Accordingly, the diameter of the end cover (1) for the gas-insulated switchgear may increase.

[0058] Although not shown in the drawing, the belt portion (60) may further include a plurality of grooves (61) formed along the longitudinal direction and an adjustment bolt (62) that rotates in engagement with the grooves (61). One groove (61) may be formed to engage with a thread formed on the outer surface of the adjustment bolt (62). By tightening and loosening the adjustment bolt (62), the length of the overlapping of the two ends of the belt portion (60) can be adjusted.

[0059] For example, when a worker tightens the adjustment bolt (62), the groove (61) engages with the threads of the adjustment bolt (62) according to the direction of tightening, thereby reducing the inner diameter of the belt portion (60). Conversely, when the adjustment bolt (62) is loosened, the groove (61) separates from the threads, and the inner diameter of the belt portion (60) may increase.

[0061] Meanwhile, according to one embodiment of the present invention, the end cover (1) for a gas-insulated switchgear may further include a gearbox (80). The gearbox (80) is coupled to the belt section (60) to adjust the diameter. More specifically, the gearbox (80) can adjust the inner diameter of the belt section (60) by operating the adjustment bolt (62) of the belt section (60). For example, power may be supplied to the gearbox (80) to operate the adjustment bolt (62).

[0062] The operator can adjust the diameter of the end cover (1) for the gas-insulated switchgear by operating the adjustment bolt (62) through the gearbox (80).

[0063] For example, the diameter of the end portion of the new type gas-insulated switchgear may be smaller than the diameter of the end portion of the old type gas-insulated switchgear. At this time, the adjustment bolt (62) can be tightened by operating the gearbox (80). When the adjustment bolt (62) is tightened, the inner diameter of the belt portion (60) may be reduced. Accordingly, the diameter adjustment bellows (40) that the belt portion (60) encloses may contract. Accordingly, the diameter of the end cover (1) for the gas-insulated switchgear can be adjusted to match the diameter of the end portion of the new type gas-insulated switchgear.

[0064] Meanwhile, the diameter of the end portion of the old gas-insulated switchgear may be larger than the diameter of the end portion of the new gas-insulated switchgear. In this case, the adjustment bolt (62) can be loosened by operating the gearbox (80). When the adjustment bolt (62) is loosened, the inner diameter of the belt portion (60) may increase. Accordingly, the diameter adjustment bellows (40) wrapped by the belt portion (60) may be extended. Through this, the diameter of the end cover (1) for the gas-insulated switchgear can be adjusted to fit the diameter of the end portion of the old gas-insulated switchgear.

[0066] According to one embodiment of the present invention, the gearbox (80) can adjust the length and diameter of the end cover (1) for the gas-insulated switchgear together. The gearbox (80) may be coupled to a guide bolt (70) on one side and a belt portion (60) on the other side. The gearbox (80) can operate a nut (71) and an adjustment bolt (62).

[0067] For example, the length of the end portion of the new type gas-insulated switchgear may be shorter than that of the new type, and the diameter may be larger. At this time, the length-adjusting bellows (20) can be retracted by operating the gearbox (80) to tighten the nut (71), thereby reducing the distance between a pair of flange portions (50). At the same time, the diameter-adjusting bellows (40) can be extended by operating the gearbox (80) to loosen the adjustment bolt (62), thereby increasing the inner diameter of the belt portion (60).

[0068] Conversely, if the length of the end portion of the old gas-insulated switchgear is longer than that of the new type and the diameter is smaller, the length-adjusting bellows (20) can be extended by operating the gearbox (80) to loosen the nut (71) and increasing the distance between a pair of flange portions (50). At the same time, the diameter-adjusting bellows (40) can be retracted by tightening the adjustment bolt (62) to reduce the inner diameter of the belt portion (60).

[0070] According to embodiments of the present invention having such a shape and structure, the length and diameter can be adjusted, thereby ensuring compatibility between new and old gas-insulated switchgear.

[0072] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the invention as claimed in the patent claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention. Explanation of the symbols

[0074] 1: End cover for gas-insulated switchgear 10: Joint 11: Rubber gasket 20: Adjustable Bellows 30: Distal part 40: Adjustable bellows 50: Flange section 51: Bolt hole 60: Belt section 61: Home 62: Adjustment bolt 70: Guide bolt 71: Nut 80: Gearbox

Claims

Claim 1 An end cover for a gas-insulated switchgear, comprising: a coupling portion having one end in the longitudinal direction open and coupled to the end of a gas-insulated switchgear; a length-adjusting bellows connected to the other end in the longitudinal direction of the coupling portion and having wavy folds repeatedly formed along the longitudinal direction; and a diameter-adjusting bellows having wavy folds repeatedly formed along the outer surface of the coupling portion. Claim 2 delete Claim 3 An end cover for a gas-insulated switchgear, comprising, in claim 1, a belt portion that wraps around the outer surface of the diameter adjustment bellows. Claim 4 An end cover for a gas-insulated switchgear, further comprising, in paragraph 3, a gearbox coupled to the belt portion to adjust the diameter. Claim 5 An end cover for a gas-insulated switchgear, further comprising: a pair of flange portions formed to protrude radially outward from both sides in the longitudinal direction of the length-adjusting bellows in claim 1; and a guide bolt connecting the pair of flange portions. Claim 6 An end cover for a gas-insulated switchgear, further comprising, in claim 5, a gearbox that is coupled to the guide bolt and adjusts the length.

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