JPS6341783Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas insulated switchgear in which components, conductors, and insulating supports are all housed in a rectangular container.

In conventional devices of this kind, when a busbar instrument transformer is used, it is attached to the outer wall of the container and supported by a support from above the base. For this reason,
The device becomes complicated and large, and the manufacturing cost also increases. In addition, there were problems such as the unorganized appearance, which was not desirable from an environmental standpoint.

This proposal was proposed in view of the above points, and its purpose is to downsize the device and simplify the mounting structure of the busbar gas meter transformer.

The present invention will be described below based on embodiments shown in the drawings.

In Fig. 1, numeral 1 is a rectangular container that houses a shield, a disconnector 2, a disconnector 3, a grounding device 4, a lightning arrester 5, a cable head 6 of a slip-on type cable, an insulating support 7, a connecting conductor 8, etc. has been done. Further, an insulating gas 9 such as SF ₆ gas is filled to insulate the filled portion. Further, the shield breaker 2 is filled with an arc-extinguishing gas such as SF ₆ gas.

Reference numeral 10 designates three busbar gas meter transformers (hereinafter referred to as busbar PT) arranged in a staggered manner as shown in FIG. 2 on a plane parallel to the ceiling in the upper part of the container 1. Each of these PTs has a main body 1 in a cylindrical container 11.
2 and is filled with an insulating gas such as SF ₆ gas as a section that is managed separately from the gas sealed in the entire gas insulated switchgear, and the high voltage side conductor 13 protrudes into the container 1. It is insulated and supported by a cone-shaped insulating spacer 14.

Further, a cylinder 17 having an outer flange 16 is hermetically welded to the bottom plate 15 of each PT, as shown in FIG.

A secondary terminal (not shown) of the bus bar PT passes through the bottom plate 15 in an airtight manner and is led out into the cylinder 17, and the cylinder 17 forms a terminal box. Reference numeral 19 is a lid of the terminal box and is attached to the flange 16 so as to be removable from the outside.

Note that 20 is a transformer connection unit, and 21 is a transformer.

The external appearance of the above is shown in Figure 4, and the single line diagram is shown in Figure 5.
Each is shown in the figure. In FIG. 4, reference numeral 22 denotes an operation box that houses operating devices such as the cable disconnector 2, the disconnector 3, and the grounding device 4.

In the above configuration, power is led to the cable and transformer connection unit 20 on the upper side via the cable mustard disconnector 2 on the lower side. At this time,
The voltage of each phase charging section is measured by bus bar PT10, and the measured value is led out into a cylindrical container 11 forming a terminal box and operates a predetermined meter via wiring. When inspecting or testing the bus bar PT10, the lid 19 is removed regardless of whether the container 1 or the bus bar PT10 is airtight.

As described above, according to the present invention, the busbars PT of each phase are arranged in a staggered manner so that the protrusions of the insulating spacers face each other on the parallel plane of the ceiling of the rectangular container, so the busbars PT can be stored in a narrow idle space, and the is more compact and has a sleeker appearance. The bus bar PT is attached to the rectangular container with a cylinder attached to the bottom plate, which also serves as a terminal box, so the attachment structure is simplified and the device can be downsized. Inspection and testing of the bus bar PT can be easily carried out by simply removing the lid of the terminal box without breaking the gas tightness of the square container or other parts. Since the bus bar PT is housed in gas, there is no need to finish painting the container and there is less deterioration over time compared to the conventional one placed in air, which provides extremely practical effects.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing one embodiment of the present invention, Figure 2
The figure is a simplified cross-sectional view taken along the - line in Figure 1.
The figure is a cross-sectional view of the main part showing the installation state of the bus bar PT.
The figure is a perspective view of the structure shown in FIG. 1, and FIG. 5 is a single line diagram of the structure shown in FIG. 1: square container, 10: bus line gas meter transformer, 14: insulating spacer, 15: bottom plate, 17: cylinder, 16, 18: flange.

Claims (1)

[Scope of utility model registration request] In a gas insulated switchgear in which components are collectively housed in a rectangular container filled with insulating gas, a protruding portion of an insulating spacer faces a gas meter transformer for each phase bus bar to a parallel surface of the ceiling of the rectangular container. A gas insulated switchgear comprising a cylindrical flange attached to the bottom plate of the transformer is fixed to a flange of the rectangular container, and the cylinder is also used as a terminal box of the transformer.