JPH07193921A - Metal-sealed switchgear - Google Patents

Abstract

PURPOSE:To reduce the size by shortening the disconnecting contact section of a draw out type switch thereby shortening the insulation distance between the disconnecting contact section and the secondary terminals of a current transformer and a zero-phase current transformer. CONSTITUTION:A housing frame 5 is set in an open front housing 20 and two contact sections 4a, 4b are secured thereto. A draw out type switch 22 has an insulator 25 embeded in a current transformer 23 and a zero-phase current transformer 24. The insulator 25 is provided, inside the housing 20, with two disconnecting contact sections 11a, 11b through the current transformer 23 or 24 and coming into contact with the fixed contact sections 4a, 4b or separating therefrom. The insulator 25 is further provided, on the front side of the housing 20, with secondary terminals 26a, 26b connected with the current transformers 23 and 24, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal closed switchgear installed in a substation.

[0002]

2. Description of the Related Art FIGS. 2A and 2B show an example of a conventional metal-closed switchgear, in which FIG. 2A is a front view and FIG. 2B is a side view. In the figure, a storage frame 5 to which fixed contact portions 4a and 4b are attached is fixed in a box body 10 having an open front surface. In the drawer type switch 2, the disconnection type contact part 1 which comes in contact with and separates from the fixed contact parts 4a and 4b on the inner side of the box body 10, respectively.
a and 1b are attached. A current transformer 13 is mounted on the disconnecting contact portion 1a, and a zero-phase current transformer 14 is mounted on the disconnecting contact portion 1b.
Will be installed. Between the secondary terminal 16a of the current transformer 13 and the disconnect type contact portion 1a, and the secondary terminal 16 of the zero-phase current transformer 14.
An air insulation distance is secured between b and the disconnect type contact portion 1b. A monitoring device 7, a test terminal 8 and a handle 6 are attached to the front side of the drawer type switch 2. In addition, one end of the secondary terminals 16a and 16b is connected to the test terminal 8 through
It is connected to the monitoring device 7.

In the conventional metal closed switchgear described above, in the operating state shown in FIG. 2, the drawer type switch 2 is housed in the housing frame 5, and the disconnect type contact portions 1a and 1b are fixed contact portions 4a and 4a. 4b, respectively. Therefore,
The electrical information of the disconnect type contact parts 1a and 1b, which is the main circuit, is measured by the current transformer 13 and the zero-phase current transformer 14, and the secondary terminal 1
Monitoring device 7 through 6a, 16b and test terminal 8
Be monitored in. When the pull-out switch 2 is pulled out from the storage frame 5 by operating the handle 6, the disconnect type contact portions 1a and 1b are separated from the fixed contact portions 4a and 4b, so that the pull-out type switch 2 is in the disconnect position. Becomes

[0004]

In the conventional metal-closed switchgear described above, a current transformer 13 is mounted on the disconnecting contact portion 1a, and a zero-phase current transformer 14 is mounted on the disconnecting contact portion 1b.
Therefore, the disconnection type contact portion 1a and the disconnection type contact portion 1b need to be lengthened by the thickness of the current transformer 13 and the zero-phase current transformer 14.

Further, since the disconnection type contact portion 1a and the disconnection type contact portion 1b are main circuit charging portions, between the secondary terminal 16a of the current transformer 13 and the secondary terminal 16b of the zero-phase current transformer 14. , It is necessary to secure the air insulation distance respectively. Therefore, the present invention shortens the disconnection type contact part of the drawer type switch and shortens the insulation distance between the disconnection type contact part and the secondary terminals of the current transformer and the zero-phase current transformer to reduce the size. The purpose is to

[0006]

In the metal-closed switchgear of the present invention, a housing frame housed in a box body having a front opening, two fixed contact portions mounted on the housing frame, and a current transformation. So that the transformer and the zero-phase current transformer have an insulator embedded therein, and the current transformer or the zero-phase current transformer, respectively, and so as to contact and separate from the fixed contact portion, respectively. The two disconnection-type contact portions arranged in the insulator on the inner side of the box body and connected to the current transformer or the zero-phase current transformer, respectively, and the insulation on the front side of the box body. A secondary terminal disposed on the body.

[0007]

In the metal-closed switchgear of the present invention described above, since the current transformer and the zero-phase current transformer are built in the insulator of the drawer type switch, the disconnection type contact portion is used for the current transformer and the zero-phase current transformer. Since the thickness of the current transformer can be shortened and the insulation distance between the secondary terminal of the current transformer and the zero-phase current transformer and the disconnect type contact part can be reduced, the metal-closed switchgear Can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a metal-closed switchgear according to the present invention, (A) is a front view and (B) is a side view. In the figure, the inside of the box body 20 with the front opening is
The storage frame 5 to which the fixed contact portions 4a and 4b are attached is fixed. In the drawer type switch 22, an insulator 25 is formed on the inner side of the box body 20, which is made of an insulating material such as a mold resin and in which a current transformer 23 and a zero-phase current transformer 24 are embedded. The secondary terminal 26a of the current transformer 23 and the secondary terminal 26b of the zero-phase current transformer 24 are attached to the front surface side of the box body 20 of the insulator 25.

A disconnect type contact portion 1 which comes in contact with and separates from the fixed contact portion 4a.
1a penetrates the current transformer 23 and is attached to the inside of the box body 20 of the insulator 25, and the disconnect type contact portion 11b that comes in contact with and separates from the fixed contact portion 4b penetrates the zero-phase current transformer 24 and becomes the insulator. It is attached to the inside of the box body 20 of 25. In this case, the disconnection-type contact portions 11a, 11b and the secondary terminals 26a, 26b are not insulated in the air but are insulated by the insulator of the insulator 25, and are therefore arranged in proximity to each other. The secondary terminal 26
One ends of a and 26 b are connected to the monitoring device 7 via the test terminal 8. A monitor 7, a test terminal 8 and a handle 6 are attached to the front side of the drawer type switch 22.

In the above-described metal closed switchgear of the present invention, in the operating state shown in FIG.
2 is stored in the storage frame 5, and the disconnect type contact portions 11a and 1
1b contacts fixed contact parts 4a and 4b, respectively.
Therefore, the electrical information of the disconnect type contact portions 1a and 1b is the current transformer 2
3 and the zero-phase current transformer 24, the secondary terminals 26a,
It is monitored by the monitoring device 7 via 26 b and the test terminal 8. In addition, by operating the handle 6, the drawer type switch 2
2 and the storage frame 5 are pulled out, the disconnect type contact portions 11a and 11b are separated from the fixed contact portions 4a and 4b, and the pull-out type switch 22 is in the disconnect position.

[0011]

According to the present invention, since the current transformer and the zero-phase current transformer are built in the insulator of the drawer type switch, the disconnection type contact portion is provided in the thickness of the current transformer and the zero-phase current transformer. It is possible to reduce the size of the metal-closed switchgear by shortening the insulation distance between the secondary terminals of the current transformer and the zero-phase current transformer and the disconnect type contact part. It will be possible.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a front view and (B) is a side view.

2A and 2B show a conventional example, in which FIG. 2A is a front view and FIG.
It is a side view.

[Explanation of symbols]

 11a, 11b Disconnection type contact part 20 Box body 22 Drawing type switch 23 Current transformer 24 Zero phase current transformer 25 Insulator 26a, 26b Secondary terminal

Claims (1)

[Claims] 1. A storage frame housed in a box body having an open front surface, two fixed contact parts attached to the storage frame, and an insulator in which a current transformer and a zero-phase current transformer are embedded. And a draw-out switch having, passing through the current transformer or the zero-phase current transformer,
And two disconnecting contact portions arranged in the insulator inside the box so as to contact and separate from the fixed contact portion, and connected to the current transformer or the zero-phase current transformer, respectively. And a secondary terminal disposed in the insulator on the front side of the box body, and a metal-closed switchgear.