Gas-insulated switchgear

Abstract

A gas-insulated switchgear (1) has a cable chamber (3) that accommodates a main circuit to which a high voltage is applied inside a main circuit tank (2) in which a gas having exceptional insulation performance is sealed, the cable chamber (3) connecting an external wire cable (20) via a bushing (6) that internally and externally penetrates the main circuit tank (2). The cable chamber (3) is constituted from a cable chamber fixed casing (30a) and a cable chamber divided casing (30b). The cable chamber divided casing (30b) is provided with a structure that enables detachment by sliding in the horizontal direction.

Description

Gas-insulated switchgear

[0001] The present disclosure relates to gas-insulated switchgear.

[0002] In switchgear, the main circuit section, control circuit section, circuit breaker drive section, bus section, cable room, etc. are often separated by partitions. Among these, gas-insulated switchgear houses the main circuit section, to which high voltage is applied, in a tank (sealed container), which is filled with gas, an insulating medium with excellent insulating performance, thereby achieving space-saving arrangement of the main circuit equipment. Furthermore, due to installation space constraints, further reduction in the external dimensions of gas-insulated switchgear is required, and it is also essential to reduce the size of the cable room that makes up the gas-insulated switchgear.

[0003] In switchgear, external cable installation work is generally performed by one person through a partial opening in the front of the cable room, and space is limited. Therefore, high skill is required to reliably and reliably connect heavy cables and install lightning arresters. To address this issue, a switchgear with an opening extending from the floor plate to the rear sidewall and a structure that allows external cables to be pulled into the cable room simply by removing an L-shaped cover covering this opening has been disclosed (e.g., Patent Document 1). Another switchgear with an L-shaped opening extending from the rear bottom of the housing to the lower back and equipped with a blocking plate to close the opening has also been disclosed (e.g., Patent Document 2).

[0004] JP 2016-220486 JP 9-191510 JP

[0005] However, in the switchgears of Patent Documents 1 and 2, the size of the opening in the cable room is limited, and for example, when the rear surface and the rear wall are close to each other, it is difficult to perform connection work through the opening. Also, it is difficult to install cables in various connection forms.

[0006] The present disclosure discloses a technology for solving the above-mentioned problems, and aims to provide a gas-insulated switchgear that allows access from the side as well as the front when installing cables, and that can easily accommodate a variety of cable connection configurations while maintaining the external dimensions of the reduced-size gas-insulated switchgear.

[0007] The gas-insulated switchgear disclosed herein is a gas-insulated switchgear that houses a main circuit to which a high voltage is applied inside a main circuit tank filled with a gas having excellent insulating performance, and has a cable chamber to which an external cable is connected via a bushing that penetrates the main circuit tank from the inside to the outside, and the cable chamber is composed of a cable chamber fixed housing and a cable chamber partition housing, and the cable chamber partition housing has a structure that allows it to be attached and detached by sliding it horizontally.

[0008] According to the gas insulated switchgear of the present disclosure, a gas insulated switchgear that can easily accommodate a variety of cable connection configurations while maintaining reduced external dimensions can be obtained.

[0009] Fig. 1 is a side view showing the configuration of a gas-insulated switchgear according to embodiment 1. Fig. 2 is a structural diagram of a cable room of the gas-insulated switchgear according to embodiment 1. Fig. 3 is a schematic diagram of the cable room of the gas-insulated switchgear according to embodiment 1. Fig. 4 is a schematic diagram of the cable room of a gas-insulated switchgear of a comparative example according to embodiment 1. Fig. 5 is a side view showing the configuration of a gas-insulated switchgear according to embodiment 2. Fig. 6 is an explanatory diagram of main parts related to attachment and detachment of the cable room of a gas-insulated switchgear according to embodiment 3.

[0010] Embodiment 1. Embodiment 1 relates to a gas-insulated switchgear that houses a main circuit to which a high voltage is applied inside a main circuit tank filled with a gas having excellent insulating properties, has a cable room to which an external cable is connected via a bushing that penetrates the main circuit tank from the inside to the outside, and the cable room is composed of a cable room fixed housing and a cable room partition housing, and the cable room partition housing has a structure that allows it to be attached and detached by sliding it horizontally.

[0011] The gas-insulated switchgear according to the first embodiment will be described below with reference to Fig. 1, which is a side view showing the configuration of the gas-insulated switchgear, Fig. 2, which is a structural diagram of a cable room, Fig. 3, which is a schematic diagram of the cable room, and Fig. 4, which is a schematic diagram of the cable room of a gas-insulated switchgear of a comparative example. Note that the same or corresponding parts in each drawing are designated by the same reference numerals.

[0012] First, the configuration of a gas-insulated switchgear 1 according to a first embodiment will be described with reference to FIG. 1 , which is a side view of the gas-insulated switchgear 1. Components not directly related to the present disclosure are omitted. For ease of explanation, the front-to-back direction in FIG. 1 will be referred to as the X direction, the left-to-right direction as the Y direction, and the up-to-down direction as the Z direction. The X, Y, and Z directions in FIG. 2 and subsequent figures will also be the same as those in FIG. 1. In the following description, the right side of FIG. 1, i.e., the positive side in the Y direction, will be referred to as the front surface of the gas-insulated switchgear 1.

[0013] The gas-insulated switchgear 1 has a plurality of compartments inside a housing 10, which is divided into a main circuit tank 2, a cable room 3, a disconnector room 4, and a control room 5, and is fixed on a base 9. The cable room 3 is composed of a cable room fixed housing 30a and a cable room dividing housing 30b. The cable room dividing housing 30b is provided with a cable room cover 8.

[0014] The cable room fixed housing 30a includes a cable bracket 7a for fixing the external cable 20, and the cable bracket 7a is adjustable in the front-to-back and up-to-down directions. A bushing 6 penetrating the main circuit tank 2 is provided within the cable room 3. The bushing 6 is connected to the external cable 20 drawn from below the cable room 3. The external shape of the bushing 6 is defined by the EN (European Norm) standard, but the shape of the connection terminal (connector) of the external cable 20 varies depending on the cable manufacturer. Also, because FIG. 1 is a side view of the gas-insulated switchgear 1, only one external cable 20 is shown. However, in the case of a three-phase AC power supply, three external cables 20 are fixed side by side in the X direction of FIG. 1. Part A in FIG. 1 will be described in embodiment 3.

[0015] 2 is a structural diagram of the cable room 3 of the gas-insulated switchgear 1. The cable room partition housing 30b can be easily detached by sliding it horizontally (in the Y direction in FIG. 2). For example, it can be attached to the cable room fixed housing 30a, the disconnector room 4, and the base 9 with screws or the like.

[0016] FIG. 3 is a schematic diagram of the cable room 3 of the gas-insulated switchgear 1, and the dimensional ratio between the depth dimension L1 of the cable room fixed housing 30a and the depth dimension L2 of the cable room partition housing 30b is arbitrary and not limited.

[0017] After installation of the gas-insulated switchgear 1, it is necessary to perform work to connect the external cable 20 to the bushing 6. In a typical gas-insulated switchgear 1R shown as a comparative example, as shown in FIG. 4, the cable compartment cover 8R on the front side of the cable compartment 3R must be removed, and work must be performed through the front opening, resulting in cable installation work in a limited space. On the other hand, in the gas-insulated switchgear 1 of the first embodiment, as shown in FIG. 3, openings can be formed on the front and parts of both sides by removing the cable compartment partition housing 30b. This allows access from the sides in addition to the front when installing cables. This ensures the necessary space and allows multiple people to work together, resulting in high-quality installation work in a short time.

[0018] After the cables are connected, the cable room dividing housing 30b can be reattached by sliding it horizontally. The external dimensions of the cable room 3 can be reduced by assuming that the cable room dividing housing 30b will be removed to ensure the space required for cable installation.

[0019] In the above description, a gas-insulated switchgear has been used as an example, but the gas-insulated switchgear of embodiment 1 can be applied to oil-insulated switchgears, solid-insulated switchgears, composite-insulated switchgears, and the like, which require high insulation performance.

[0020] In the above description, the cable room 3 is composed of the cable room fixed housing 30a and the cable room dividing housing 30b, but the cable room dividing housing 30b can be further divided into multiple housings (for example, two). In this case, even if the distance between the cable room cover 8 and the wall is small, the cable room dividing housing 30b can be easily attached and detached.

[0021] In the above description, the external cable 20 connected to the main circuit is connected in the cable room 3, but the connection process for the control cable can also be performed in the cable room 3.

[0022] As described above, the gas insulated switchgear of the first embodiment can easily accommodate a variety of cable connection configurations while maintaining reduced external dimensions.

[0023] Second Embodiment The second embodiment relates to the connection of the second external cable and the lightning arrester in the cable room.

[0024] A gas-insulated switchgear according to a second embodiment will be described with reference to Fig. 5, which is a side view showing the configuration of the gas-insulated switchgear. In the drawing of the second embodiment, parts that are the same as or equivalent to those of the first embodiment are given the same reference numerals.

[0025] The difference from the first embodiment is that in addition to the first external cable 20, a second external cable 20 or a lightning arrester 21 is connected to the bushing 6. Accordingly, a cable bracket 7b is provided to secure the second external cable 20 or the lightning arrester 21, and the cable bracket 7b is adjustable in position in the front-to-back and up-to-down directions. Even with this configuration, the cable room dividing housing 30b can be easily detached by sliding it horizontally. For example, by configuring the cable room dividing housing 30b to be attached to the cable room fixed housing 30a and the base 9 with screws or the like, it is possible to easily accommodate various cable connection configurations, such as connecting the second external cable 20 or the lightning arrester 21. Note that part A in FIG. 5 will be described in the third embodiment.

[0026] As described above, the gas insulated switchgear of the second embodiment can easily accommodate various cable connection configurations while maintaining its reduced external dimensions. Furthermore, it can also accommodate the connection of a second external cable 20 or a lightning arrester 21.

[0027] Third Embodiment The third embodiment relates to a measure to reduce interference with the upper compartment when the cable room dividing housing 30b is attached or detached.

[0028] The gas-insulated switchgear of the third embodiment will be described with reference to Fig. 6, which is an explanatory diagram of the main parts related to the attachment and detachment of the cable compartment, focusing on the differences from the first embodiment. In the drawings of the third embodiment, the same or equivalent parts as those of the first embodiment are designated by the same reference numerals.

[0029] FIG. 6 is an enlarged view of portion A in FIGS. 1 and 5 , showing the state in which the cable room dividing housing 30b is removed. The corners of the disconnector chamber 4, which is a compartment located above the detachable cable room dividing housing 30b, are chamfered as shown in portion B in FIG. 5 . This chamfering reduces interference with the disconnector chamber 4 when the cable room dividing housing 30b is attached to the gas-insulated switchgear 1 after being removed. The hatched area in FIG. 6 is the contact surface when the cable room dividing housing 30b slides horizontally during attachment and detachment. To reduce friction, a lubricant 41 is applied to the contact surface between the bottom surface of the cable room dividing housing 30b and the base 9. This configuration facilitates the attachment and detachment of the cable room dividing housing 30b and reduces the number of steps required.

[0030] As described above, the gas-insulated switchgear of embodiment 3 can easily accommodate a variety of cable connection configurations while maintaining its reduced external dimensions. Furthermore, interference during attachment and detachment of the cable compartment partition housings can be reduced, facilitating the attachment and detachment work.

[0031] Although various exemplary embodiments and examples are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are anticipated within the scope of the technology disclosed in this specification. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0032] 1 Gas-insulated switchgear, 2 Main circuit tank, 3 Cable room, 4 Disconnector room, 5 Control room, 6 Bushing, 7a, 7b Cable bracket, 8 Cable room cover, 9 Base, 10 Housing, 20 External cable, 21 Lightning arrester, 30a Cable room fixed housing, 30b Cable room dividing housing, 41 Lubricant, 1R Gas-insulated switchgear, 3R Cable room, 8R Cable room cover.

Claims

1. A gas-insulated switchgear that houses a main circuit to which a high voltage is applied inside a main circuit tank filled with a gas having excellent insulating properties, and has a cable room to which an external cable is connected via a bushing that penetrates the inside and outside of the main circuit tank, the cable room being composed of a cable room fixed housing and a cable room dividing housing, and the cable room dividing housing having a structure that allows it to be attached and detached by sliding it horizontally.

2. The gas-insulated switchgear according to claim 1, wherein the cable room divided housing has a structure that can be divided into a plurality of sections.

3. A gas-insulated switchgear according to claim 1 or claim 2, wherein the cable room is provided with a cable bracket that holds the external cable and a lightning arrester that protects against lightning surges, and the cable bracket is adjustable in position in the front-to-back and up-to-down directions.

4. A gas-insulated switchgear according to any one of claims 1 to 3, wherein when the cable room dividing housing is slid and attached to the cable room fixed housing of the cable room, the corners of the compartments located on the upper side of the cable room dividing housing that come into contact with the cable room dividing housing are chamfered, and a lubricant is applied to the upper surface of the cable room dividing housing and the lower surface of the compartments.

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