Gas insulated switchgear

Abstract

The gas-insulated switchgear (1) houses a main circuit to which a high voltage is applied inside a main circuit tank (2) filled with a gas having excellent insulating properties, and has a cable chamber (3) to which an external cable (20) is connected via a bushing (6) that penetrates the main circuit tank (2) from the inside to the outside. The cable chamber (3) is composed of a cable chamber fixed housing (30a) and a cable chamber partition housing (30b). The cable chamber partition housing (30b) has a structure that allows it to be attached and detached by sliding it horizontally.

Description

[Technical field]

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

[0002] In switchgear, the main circuit section, control circuit section, circuit breaker drive section, busbar section, cable room, etc. are often separated by partitions. Among them, gas-insulated switchgear stores the main circuit section to which high voltage is applied in a tank (sealed container), and the tank is filled with gas, which acts as an insulating medium with excellent insulating performance, thereby realizing space saving in the layout of the main circuit equipment. Furthermore, due to restrictions on installation space, there is a demand for further reduction in the external dimensions of the gas-insulated switchgear, and it is also essential that the cable room constituting the gas-insulated switchgear be made smaller.

[0003] In the switchgear, the external cable installation work is basically done by one person because the work is done through a partial opening in the front of the cable room, and the space is limited. Therefore, high skills are required to perform the heavy cable connection work and the lightning arrester installation work reliably and with high quality. As a countermeasure to this problem, a switchgear has been disclosed that has an opening extending from the floor panel to the rear side wall, and that makes it possible to pull the external cable into the cable room simply by removing the L-shaped cover that covers this opening (for example, Patent Document 1). Also, a distribution board has been disclosed in which an opening is formed in an L shape from the rear bottom surface of the housing toward the lower back surface, and a blocking plate is provided to block the opening (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-220486 A [Patent Document 2] Japanese Patent Application Publication No. 9-191510 Summary of the Invention [Problem to be solved by the invention]

[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. In addition, it is difficult to install cables for various connection forms.

[0006] The present disclosure discloses techniques for solving the problems described above, and has an object to provide a gas-insulated switchgear that allows access from the side as well as the front during cable installation, and that can easily accommodate a variety of cable connection configurations while maintaining the external dimensions of the reduced-size gas-insulated switchgear. [Means for solving the problem]

[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 in which a gas with excellent insulating performance is sealed, and 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 a cable room fixed housing and It has a front surface, two side surfaces, a top surface, and a bottom surface. The cable room dividing housing is constructed so as to be detachable by sliding it horizontally. Effect of the Invention

[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. [Brief description of the drawings]

[0009] [Figure 1] 1 is a side view showing a configuration of a gas-insulated switchgear according to a first embodiment. [Diagram 2] 1 is a structural diagram of a cable room of a gas-insulated switchgear according to a first embodiment. [Diagram 3]2 is a schematic diagram of a cable room of the gas-insulated switchgear according to the first embodiment. FIG. [Figure 4] FIG. 4 is a schematic diagram of a cable room of a gas-insulated switchgear as a comparative example to the first embodiment. [Diagram 5] FIG. 11 is a side view showing the configuration of a gas-insulated switchgear according to a second embodiment. [Figure 6] FIG. 11 is an explanatory diagram of a main part related to attachment and detachment of a cable chamber of a gas-insulated switchgear according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Embodiment 1 The first embodiment 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 with excellent insulating performance, and 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, the cable room being composed of a cable room fixed housing and a cable room partition housing, and the cable room partition housing having a structure that allows it to be attached and detached by sliding it horizontally.

[0011] The gas-insulated switchgear according to embodiment 1 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 view of a cable room, FIG. 3, which is a schematic view of the cable room, and FIG. 4, which is a schematic view of the cable room of a gas-insulated switchgear of a comparative example. In addition, the same or corresponding parts in each drawing are indicated by the same reference numerals.

[0012] First, the configuration of a gas-insulated switchgear 1 according to the first embodiment will be described with reference to Fig. 1 which is a side view of the gas-insulated switchgear 1. Note that components that are not directly related to the present disclosure are omitted. 1 will be referred to as the X direction, the Y direction, and the Z direction, respectively. In Fig. 2 and subsequent figures, the X, Y, and Z directions are the same as those in Fig. 1. In the following description, the right side of FIG. 1, that is, the positive side in the Y direction, is the front side 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 divided housing 30b. The cable room divided housing 30b is provided with a cable room cover 8.

[0014] A cable bracket 7a for fixing the external cable 20 is provided inside the cable room fixed housing 30a, and the position of the cable bracket 7a can be adjusted in the front-rear and up-down directions. A bushing 6 penetrating the main circuit tank 2 is provided in the cable room 3 . The bushing 6 is connected to an external cable 20 drawn in from below the cable room 3 . The outer shape of the bushing 6 is determined by the EN (European Norm) standard, but the shape of the connection terminal (connector) of the outside cable 20 varies depending on the cable manufacturer. In addition, since FIG. 1 is a side view of the gas-insulated switchgear 1, only one external cable 20 is shown, but in the case of a three-phase AC power supply, three external cables 20 are fixed side by side in the X direction in FIG. 1. The portion A in FIG. 1 will be described in the third embodiment.

[0015] Fig. 2 is a structural diagram of the cable room 3 of the gas-insulated switchgear 1. The cable room divided housing 30b can be easily detached by sliding it horizontally (Y direction in Fig. 2). For example, it is 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 casing 30a and the depth dimension L2 of the cable room partition casing 30b is arbitrary and there is no restriction.

[0017] After the gas-insulated switchgear 1 is installed, it is necessary to carry out construction work for connecting the external cable 20 to the bushing 6 . In the general gas-insulated switchgear 1R shown as a comparative example, as shown in Figure 4, by removing the cable room cover 8R at the front of the cable room 3R, work can 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, by removing the cable room partition 30b, openings can be provided in parts of the front and both sides. Therefore, when installing cables, access is possible from the sides in addition to the front. This ensures the necessary space and enables multiple people to work together, resulting in high quality installation work in a short time.

[0018] After the cables are connected, the cable room partition housing 30b can be reinstalled by sliding it horizontally. Regarding the external dimensions of the cable room 3, it is sufficient to consider that the space required for cable installation work can be secured by removing the cable room partition housing 30b, and the external dimensions of the cable room 3 can be reduced.

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

[0020] In the above description, the cable room 3 is configured from 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 a plurality of housings (for example, 2). 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. However, the connection of 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] Embodiment 2 The second embodiment relates to the connection of a second external cable and a lightning arrester in a cable room.

[0024] Second Embodiment 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 drawings 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 for fixing the second external cable 20 or the lightning arrester 21 is provided, and the position of the cable bracket 7b can be adjusted in the front-rear and up-down directions. Even in 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 so that it can be attached to the cable room fixed housing 30a and the base 9 with screws or the like, it can easily accommodate various cable connection configurations, such as connecting a second external cable 20 or a lightning arrester 21. The part A in FIG. 5 will be explained 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 a reduced external dimension. Furthermore, it can also accommodate the connection of a second external cable 20 or a lightning arrester 21.

[0027] Embodiment 3 The third embodiment relates to a measure to reduce interference with the upper compartment when attaching or detaching the cable room dividing housing 30b.

[0028] A gas-insulated switchgear according to a third embodiment will be described with reference to FIG. 6 which is an explanatory diagram of a main part related to attachment and detachment of the cable room, focusing on the differences from the first embodiment. In the drawings of the third embodiment, parts that are the same as or equivalent to those of the first embodiment are given the same reference numerals.

[0029] 6 is an enlarged view of part A in FIG. 1 and FIG. 5, showing a state in which the cable room division housing 30b is removed. The figure shows a corner of the disconnector room 4, which is a compartment located on the upper side of the detachable cable room division housing 30b. 6 As shown in part B of FIG. 1, the cable room divided housing 30b is chamfered. By chamfering the cable room divided housing 30b, interference with the disconnector chamber 4 can be reduced when the cable room divided housing 30b is attached to the gas insulated switchgear 1 after being removed. Moreover, the hatched portion shown in FIG. 6 becomes the contact surface when the cable room divided housing 30b slides horizontally when being attached or detached, and a lubricant 41 is applied to this surface to reduce friction. In addition, a lubricant may be applied to the contact surface between the bottom surface of the cable room divided housing 30b and the base 9 in some cases. With this configuration, the cable room dividing housing 30b can be attached and detached smoothly, and the number of work steps can be reduced.

[0030] As described above, the gas insulated switchgear of the third embodiment can easily accommodate various cable connection configurations while maintaining a reduced external dimension. Furthermore, interference during attachment and detachment of the cable room partition housing can be reduced, facilitating the attachment and detachment work.

[0031] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in this specification, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment. [Explanation of symbols]

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

Claims

1. A gas-insulated switchgear comprising a main circuit to which a high voltage is applied, housed inside a main circuit tank filled with a gas with excellent insulating properties, The main circuit tank has a cable chamber through which external cables are connected via bushings that penetrate the inside and outside, and the cable chamber is composed of a fixed cable chamber housing and a divided cable chamber housing having a front section, both side sections, a top section, and a bottom section. The aforementioned cable chamber divider housing is a gas-insulated switchgear with 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 chamber partition housing has a structure that allows it to be divided into multiple parts.

3. The cable room is equipped with cable brackets for holding the external cables and surge protectors to protect against lightning surges. The gas-insulated switchgear according to claim 1 or claim 2, wherein the cable bracket is adjustable in the front-rear and up-down directions.

4. When sliding the cable chamber divider housing to attach it to the cable chamber fixing housing of the cable chamber, the corners of the compartment located on the upper side of the cable chamber divider housing that abut against the cable chamber divider housing are chamfered. The gas-insulated switchgear according to claim 1 or claim 2, wherein a lubricant is applied to the upper surface of the cable chamber divider housing and the lower surface of the compartment.

5. When the cable room partition housing is slid to attach the cable room to the cable room fixing housing of the cable room, the corners of the compartment located on the upper side of the cable room partition housing that abut against the cable room partition housing are chamfered, The gas-insulated switchgear according to claim 3, wherein a lubricant is applied to the upper surface of the cable chamber partition housing and the lower surface of the compartment.

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