Method for providing shield ring of spacer for gas-insulated switchgear, and spacer for gas-insulated switchgear manufactured thereby

Abstract

A spacer for a gas-insulated switchgear, according to the present invention, comprises: a flange including a connection hole; a shield ring disposed inside the flange; and a connection assembly for connecting the flange and the shield ring, wherein the connection assembly includes a bolt part, a packing part and an elastic part. Here, the bolt part can include a head and a body, which passes through the connection hole. The packing part can include: a catching part caught on and fixed to the flange; and a penetration part passing through the connection hole. In addition, the elastic part can be a spring disposed between the bolt part and the packing part. According to the present invention, fluidic movement of the shield ring is permitted during curing and cooling of a main insulating material so that the accumulation of internal stress is prevented, and thus damage to a product can be prevented.

Description

Method for installing shield ring of spacer for gas-insulated switchgear and spacer for gas-insulated switchgear manufactured thereby

[0001] The present invention relates to a method for installing a shield ring of a spacer for a gas-insulated switchgear and a spacer for a gas-insulated switchgear manufactured thereby.

[0002] Spacers for gas-insulated switchgear are insulating components that support conductors within gas-insulated switchgear and establish insulating compartments. They are core components that require sufficient resistance to physical and insulation destruction due to mechanical stress, such as durability against high electric fields and heat resistance of insulating materials.

[0003] Recently, with the rise in voltage in power systems and the increasing demand for voltage and current measurement precision, interest in transformers (CT / VT), which are high-voltage and high-current measuring devices, is growing. These transformers have been used so far by being composed of iron cores and windings. However, their size reaches approximately 1 / 6 of the length of the entire gas-insulated switchgear (GIS) in the 170kV class, requiring a large footprint. In addition, because they use magnetic materials for the iron core, they have the disadvantage of large measurement errors and difficulties in measuring currents exceeding a certain limit due to the magnetic saturation characteristics of the magnetic materials.

[0004] To meet recent market demands, leading international companies are developing and releasing coreless electronic transformers. They are also developing products with Rogowski coils and field probes integrated into spacers. Unlike conventional core-type transformers, these electronic transformers for high-voltage switches utilize solid insulating materials, ensuring both measurement accuracy and high reliability.

[0005] Figure 1 illustrates a conventional electronic transformer for high-voltage switches. Conventional electronic transformers measure bus voltage based on the capacitive voltage divider principle using an electronic ring, and measure bus current using a Rogowski coil. The electrode ring for measuring bus voltage is made of a cylindrical conductor.

[0006] The internal structure (hereinafter referred to as the "shield ring") embedded in the electronic transformer is an aluminum support where an electronic voltage / current sensor for the instrument can be installed. It is a structure that is fixed to the external flange to serve as a zero potential through grounding. However, during the hardening and cooling process of the main insulator during the spacer manufacturing, a gap may form at the interface between the main insulator and the shield ring due to a difference in shrinkage rate between the epoxy-based main insulator and the aluminum-based shield ring. This gap, where the insulation is weak, can cause electric field distortion and, under harsh conditions, lead to insulation breakdown. Furthermore, this can become a fatal problem that can cause product damage (breakage).

[0007] The present invention has been conceived in consideration of the above-described problems, and an object of the present invention is to provide a shield ring installation method capable of preventing product damage caused by a difference in thermal shrinkage rate between a main insulator and a shield ring, and a spacer for a gas-insulated switchgear manufactured thereby.

[0008] In addition, the purpose of the present invention is to provide a shield ring installation method having a connection structure capable of preventing the occurrence of voids at the epoxy-aluminum interface that may occur during product curing due to a difference in thermal shrinkage rates between the main insulator and the shield ring, and a spacer for a gas-insulated switchgear manufactured thereby.

[0009] A method for installing a shield ring of a spacer for a gas-insulated switchgear according to the present invention comprises the steps of: providing an outer flange including a connecting hole; arranging a shield ring inside the outer flange and connecting the shield ring and the outer flange using a connecting assembly; and injecting an insulating material into the outer flange and then curing it; wherein the connecting assembly comprises: a bolt part including a head and a body penetrating the connecting hole; a packing part including a hooking part hooked to the outer flange and an extension part penetrating the connecting hole; and an elastic part disposed between the bolt part and the packing part.

[0010] In addition, the head of the bolt portion and the engaging portion of the packing portion can be separated by the elastic portion.

[0011] Additionally, the packing portion may include a through hole through which the body of the bolt portion passes.

[0012] Meanwhile, a spacer for a gas-insulated switchgear according to the present invention comprises: an outer flange including a connecting hole; a shield ring disposed inside the outer flange; and a connecting assembly connecting the outer flange and the shield ring; wherein the connecting assembly comprises: a bolt portion including a head and a body penetrating the connecting hole; a packing portion including a hook portion fixedly hooked to the outer flange and an extension portion penetrating the connecting hole; and an elastic portion disposed between the bolt portion and the packing portion.

[0013] In addition, the head of the bolt portion and the engaging portion of the packing portion can be separated by the elastic portion.

[0014] Additionally, the packing portion may include a through hole through which the body of the bolt portion passes.

[0015] And, the elastic part may be a spring that surrounds the body of the bolt part.

[0016] In addition, it may further include an insulating part arranged inside the flange and covering the shield ring.

[0017] According to the present invention, by allowing fluid movement of the shield ring during the hardening and cooling process of the main insulator, damage to the product can be prevented by blocking the accumulation of internal stress.

[0018] Figure 1 illustrates a conventional electronic transformer for a high-voltage switch.

[0019] Figure 2 illustrates a spacer for a gas-insulated switchgear according to the present invention.

[0020] Figure 3 illustrates the internal structure of a spacer for a gas-insulated switchgear according to the present invention.

[0021] Figure 4 is an enlarged view of the connection assembly of a spacer for a gas-insulated switchgear according to the present invention.

[0022] Figure 5 is an exploded view of the connection assembly of a spacer for a gas-insulated switchgear according to the present invention.

[0023] Figure 6 illustrates components included in a connecting assembly of a spacer for a gas-insulated switchgear according to the invention.

[0024] The following detailed description of the present invention refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention, while different from each other, are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention. Furthermore, it should be understood that the positions or arrangements of individual components within each disclosed embodiment may be modified without departing from the spirit and scope of the present invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly described. Like reference numerals in the drawings designate the same or similar functions throughout the several aspects.

[0025] Hereinafter, the present invention will be described in detail with reference to the attached drawings.

[0026] Fig. 2 illustrates a spacer for a gas-insulated switchgear according to the present invention. As illustrated in Fig. 2, the spacer for a gas-insulated switchgear according to the present invention is an insulating component that supports a conductor (120) within the gas-insulated switchgear while establishing an insulating compartment. Since it is placed between tubular passages, it is mostly manufactured in a circular or disc shape. Accordingly, the flange (110) that accommodates the insulating portion (130) formed of an insulating material such as epoxy takes a ring shape. However, the circular or disc-shaped spacer as shown in Fig. 2 is merely an example, and may have various shapes or different curvatures as needed, and the spacer for a gas-insulated switchgear according to the present invention is not limited to any specific shape or form.

[0027] In order to prevent problems such as product damage due to differences in thermal shrinkage rates between the main insulator and the shield ring as described above, the spacer for a gas-insulated switchgear according to the present invention can achieve technical effects such as securing fluidity of the shield ring and preventing epoxy leakage by connecting the flange and the shield ring using a connecting assembly.

[0028] Figure 3 illustrates the internal structure of a spacer for a gas-insulated switchgear according to the present invention. Figure 3 (a) is a side cross-sectional view of the spacer for a gas-insulated switchgear according to the present invention, and Figure 3 (b) is an internal perspective view. In particular, conductors are omitted in Figure 3 (b) for the sake of understanding.

[0029] As illustrated in FIG. 3, a spacer for a gas-insulated switchgear according to the present invention includes a flange (110) and a shield ring (140), and an insulating portion (130) is arranged inside the flange (110). At this time, the insulating portion (130) covers the shield ring (140). Specifically, the insulating portion (130) can be formed by providing a flange (110), arranging a shield ring inside the flange so as to be connected to the flange, and then injecting and curing an insulating material such as epoxy into the flange.

[0030] At this time, the flange (110) and the shield ring (140) are connected by a connecting assembly indicated by A in Fig. 3.

[0031] FIG. 4 is an enlarged view of a connection assembly of a spacer for a gas-insulated switchgear according to the present invention, FIG. 5 is an exploded view of a connection assembly of a spacer for a gas-insulated switchgear according to the present invention, and FIG. 6 illustrates components included in a connection assembly of a spacer for a gas-insulated switchgear according to the present invention.

[0032] Referring to FIGS. 4 to 6, the connecting assembly includes a bolt portion (150), an elastic portion (160), and a packing portion (170). The bolt portion (150) has a bolt shape including a head (151) and a body (152) (FIG. 6(a)). The head (151) has a diameter larger than that of the body (152). The bolt portion (150) may be made of a metal material, but is not limited thereto. The elastic portion (160) may be a spring, but is not limited thereto, and any structure or material having elasticity may be used (FIG. 6(b)). In addition, the packing portion (170) includes a hook portion (171), an extension portion (172) extending from the hook portion (171), and a through hole (173) corresponding to an opening penetrating the inside of the hook portion (171) and the extension portion (171) (FIG. 6(c)). The diameter of the catch (171) is larger than the diameter of the extension (172). The packing (170) may be made of a rubber material, but is not limited thereto. The packing (170) may also have a predetermined elasticity.

[0033] The bolt portion (150) is connected to the shield ring (140) through a connecting hole (111) formed in the flange (110). The connecting hole (111) is an opening through which the bolt portion (150) passes to connect the shield ring (140) to the flange (110).

[0034] More specifically, the extension (172) of the packing portion (170) passes through the connecting hole (111) of the flange (110), and the catch (171) of the packing portion (170) is caught and fixed in the connecting hole (111) of the flange (110). In addition, the bolt portion (150) passes through the through hole (173) of the packing portion (170) and is connected to the shield ring (140). The size and shape of the connecting hole (111) can be determined corresponding to the size and shape of the packing portion (170).

[0035] Furthermore, an elastic member (160) is placed between the head (151) of the bolt member (150) and the engaging member (171) of the packing member (170). The elastic member (160) may be a spring that surrounds the body (152) of the bolt member (150). The head (151) of the bolt member (150) and the engaging member (171) of the packing member (170) are separated from each other by the elastic member (160).

[0036] In terms of the assembly sequence of the connecting assembly, the elastic portion (160) and the packing portion (170) are sequentially fitted into the body (152) of the bolt portion (150) to create the connecting assembly. Thereafter, the connecting assembly passes through the connecting hole (111) of the flange (110), and one end of the bolt portion (150) of the connecting assembly is connected and fixed to the shield ring (140), thereby connecting the shield ring (140) and the flange (110).

[0037] By means of a connecting assembly, the shield ring (140) and the flange (110) are connected, and then an insulating material is injected to cover the shield ring (140) and then cured to form an insulating portion (130).

[0038] In the past, when a shield ring was fixed to a flange, internal stress was generated due to a difference in shrinkage rate, which weakened the mechanical strength. However, with the above-described structure, when the insulating material for forming the insulating part (130) is cured, the fluidity (D1) of the shield ring (140) is absorbed by the fluidity (D2) of the connecting assembly. In addition, the connecting assembly also has the technical effect of preventing leakage when molding the epoxy, which is the insulating material.

[0039] Meanwhile, the method for installing a shield ring of a spacer for a gas-insulated switchgear according to the present invention includes the following steps.

[0040] ① Step of providing a flange including a connecting hole

[0041] ② A step of placing a shield ring inside the flange and connecting the shield ring and the flange using a connecting assembly.

[0042] ③ Step of injecting insulation into the flange and then hardening it

[0043] At this time, the connecting assembly includes a bolt part, a packing part, and an elastic part, as described above.

[0044] In addition, although the above description focuses on embodiments, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present embodiment. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

[0045] [Explanation of symbols]

[0046] 110: Flange

[0047] 111: (Flange) connecting hole

[0048] 120: Conductor

[0049] 130: Insulation

[0050] 140: Shield Ring

Claims

1. A step of providing a flange including a connecting hole; A step of placing a shield ring inside the flange and connecting the shield ring and the flange using a connecting assembly; and A step of injecting insulation into the flange and then curing it; The above connecting assembly, A bolt portion including a head and a body penetrating the connecting hole; A packing part including a hooking part that is hooked and fixed to the flange and an extension part that penetrates the connecting hole; and A method for installing a shield ring of a spacer for a gas-insulated switchgear, comprising an elastic member disposed between the bolt member and the packing member.

2. In paragraph 1, A method for installing a shield ring of a spacer for a gas-insulated switchgear, wherein the head of the bolt portion and the engaging portion of the packing portion are separated by the elastic portion.

3. In paragraph 1, A method for installing a shield ring of a spacer for a gas-insulated switchgear, wherein the above packing part includes a through hole through which the body of the above bolt part passes.

4. Flange including connecting hole; A shield ring placed inside the above flange; and A connecting assembly connecting the flange and the shield ring; The above connecting assembly, A bolt portion including a head and a body penetrating the connecting hole; A packing part including a hooking part that is hooked and fixed to the flange and an extension part that penetrates the connecting hole; and A spacer for a gas-insulated switchgear, comprising an elastic member disposed between the bolt member and the packing member.

5. In paragraph 4, A spacer for a gas-insulated switchgear, wherein the head of the bolt portion and the engaging portion of the packing portion are separated by the elastic portion.

6. In paragraph 4, A spacer for a gas-insulated switchgear, wherein the packing portion includes a through hole through which the body of the bolt portion passes.

7. In paragraph 4, A spacer for a gas-insulated switchgear, wherein the elastic portion is a spring that wraps around the body of the bolt portion.

8. In paragraph 4, A spacer for a gas-insulated switchgear, further comprising an insulating member disposed inside the flange and covering the shielding ring.

Images