JPH104614A - Gas insulating switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make longer the creeping distance of a connecting section for connecting the housing of a grounding switch to the housing of another electric equipment, so that a high voltage can be applied across the grounding switch by using an insulating attaching member, which is formed in such a state that its bottom section has a through-hole for bolt, and its side section has a bowl- like shape for surrounding the head of the bolt or a nut. SOLUTION: A first housing 11 for housing a grounding switch and a second housing 2 for housing another electric requirement are fixed to each other by engaging a bolt 15 with an nut 16 with an insulating spacer 13 in between the flange sections 11a and 12a of the housing 11 and 12. An insulating attaching member 17 which is interposed between the flange section 11a of the housing 11 and the head of the bolt 15 is formed in such a way that its bottom section 17a can be pressed between the head of the bolt 15 and flange 11a, and its side section 17b has a bowl-like shape which surrounds the head of the bolt 15. Therefore, a high voltage can be applied across the grounding switch, because the creeping distances of the head of the bolt 15 and the first housing 11 housing the grounding switch become longer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear, and more particularly to an improvement in a connection between outer casings.

[0002]

2. Description of the Related Art FIG. 4 is a cross-sectional view showing a structure of a connecting portion between outer casings of a conventional gas insulated switchgear disclosed in Japanese Utility Model Publication No. 60-29284. In the figure, reference numeral 1 denotes a first jacket which houses a grounding switch (not shown) and has a flange portion 1a at an end and is made of a conductive member such as iron, and 2 denotes another electric device such as a disconnector. (Not shown) is housed and has a flange portion 2a at the end and a second jacket 3, which is made of a conductive member such as iron, is sandwiched between the flange portions 1a and 2a, and a grounding switch (not shown). An insulating spacer that supports a conductor (not shown) that connects to another electric device (not shown) and electrically insulates between the two flange portions 1a and 2a, 4 is an insulating spacer 3 and the two flange portions 1a and A sealing gasket 5 interposed between 2a penetrates both flange portions 1a, 2a and insulating spacer 3 and is screwed with nut 6 to tighten bolts 7 to fix both flange portions 1a, 2a and insulating spacer 3, and 7 Is an insulating material and bolt 5 An insulating mounting member attached interposed between the head of the flange portion 1a and bolt 5 has a through holes.

Next, the operation will be described. A first jacket 1, which is a jacket of a grounding switch, and a second jacket 2, which is a jacket of another electric device, are insulating spacers 3 between the flange portions 1a, 2a.
, And are connected and fixed by bolts 5 and nuts 6. Since the flange portion 2a of the second jacket 2 is in contact with the bolt 5 and the nut 6, there is electrical continuity, but an insulating mounting member is provided between the flange portion 1a of the first jacket 1 and the bolt 5. 7 is pressed and fixed, so that it is electrically insulated. For example, a low voltage can be applied to a grounding switch to measure the main circuit resistance and the like.

[0004]

Since the conventional gas insulated switchgear is constructed as described above, it has the following problems. In the gas insulated switchgear, the contact of the earthed switch is detachable from the conductive parts such as the circuit breaker and disconnector, and the metal jacket is grounded because it is structurally at the same potential as the contact. I have. When measuring the dielectric loss tangent (tan δ) of a transformer connected to a gas insulated switchgear, the contact is brought into contact with a conductive part such as a circuit breaker part, a disconnector part, etc., and the contact is disconnected from the ground, and about 10 KV is applied thereto. Apply high voltage. Therefore, it is necessary to insulate the first jacket of the ground switch from the second jacket 2 (ground potential) of another electric device. But it is impossible to apply a high voltage for creepage distance in the conventional insulating mounting structure (shown in Figure 3 in l ₁ below) resulting in short flashover of this part, also by creeping short There was a problem that defects due to conductive deposits were likely to occur.

[0005] The present invention has been made to solve the above problems, and has as its object to provide a gas insulated switchgear capable of applying a high voltage to a grounding switch.

[0006]

In a gas insulated switchgear according to the present invention, a grounding switch is housed therein, and a first jacket made of a conductive member having a flange at an end is connected to the grounding switch. The other electrical equipment to be stored is housed and has a flange at the end and a second jacket made of a conductive member, and is sandwiched between the flanges of both jackets to electrically connect the flanges of both jackets. An insulating spacer to be insulated, a bolt and a nut for penetrating and screwing both flange portions and the insulating spacer to fasten and fix both flange portions and the insulating spacer, and a bolt having a hole at the bottom for the bolt to penetrate, and a bolt at the side portion And an insulating mounting member whose bottom is pressed between the head or nut of the bolt and one of the flanges by tightening the bolt and nut.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a cross-sectional view showing a configuration of a connection portion between outer casings of a gas-insulated switchgear according to Embodiment 1 of the present invention. In the figure, reference numeral 11 denotes a first jacket which houses a grounding switch (not shown) and has a flange portion 11a at an end and is made of a conductive member such as iron, and 12 denotes another electric device such as a disconnector. (Not shown) is housed and has a flange 12a at the end and a second jacket 13 made of a conductive member such as iron, and a second jacket 13 is sandwiched between the flanges 11a and 12a and a ground switch (not shown). It supports a conductor (not shown) for connecting to another electric device (not shown), and has both flange portions 11a,
An insulating spacer for electrically insulating between 12a, 14 is a sealing packing interposed between the insulating spacer 13 and both flange portions 11a and 12a, 15 is both flange portions 11a,
The two flanges 11a, 12a and the insulating spacer 13 are tightened and fixed by bolts that penetrate through the insulating spacer 13 and screw into the nut 16.
1 to 16 are equivalent to conventional components. 17 is the bottom 1
An insulating mounting member formed in a bowl 7a having a hole through which the bolt 15 penetrates and having a side portion 17b surrounding the head of the bolt 15.

Next, the operation will be described. Flange portions 11a, 12 of first jacket 11 in which the grounding switch is housed and second jacket 12 in which other electrical equipment is housed
It is the same as the conventional example that it is tightened and fixed by the bolts 15 and the nuts 16 with the insulating spacer 13 interposed therebetween. The insulating mounting member 17 interposed between the flange portion 11a of the first jacket 11 and the head of the bolt 15 has a bottom portion 17a pressed between the head of the bolt 15 and the flange 11a by tightening the bolt 15 and the nut 16, and the side portion. 17
b is fixed so as to surround the head of the bolt 15.
For this reason, the insulation creepage distance between the head of the bolt 15 and the first jacket 11 of the grounding switch is greatly increased.

Next, the difference in the creepage distance of the insulating mounting member 17 between the conventional example and the present invention will be described with reference to FIGS. FIG. 2 is an explanatory view of an insulating mounting member according to the present invention, and FIG. 3 is an explanatory view of a conventional insulating mounting member. In FIG. That is, the creepage distance of the insulating mounting member 17 in the present invention is l _2, which is clearly longer than the creepage distance l ₁ of the conventional insulating mounting member 7. Therefore, even if a high voltage is applied to the grounding switch, no flashover occurs between the bolt 15 and the first jacket 11 of the grounding switch. In addition, it is possible to prevent the occurrence of defects due to conductive deposits.

[0010]

As described above, according to the present invention, the grounding switch is housed, the first jacket having a flange at the end and made of a conductive member, and the other electrical members connected to the grounding switch. A second jacket that is housed in the apparatus and has a flange portion at an end portion and is made of a conductive member, and an insulating spacer that is sandwiched between the flange portions of the two jackets and electrically insulates between the flange portions of the two jackets. A bolt and a nut that penetrate and screw together both flanges and the insulating spacer to fasten and fix both flanges and the insulating spacer, and a head or nut of the bolt at the side having a hole through which the bolt penetrates at the bottom. A first part in which the grounding switch is housed because it is formed in an encircling bowl shape and has a bottom part formed by a bolt head or nut and an insulating mounting member pressed between one of the flange parts and the nut part by tightening the bolt and nut. Jacket Insulation creepage distance between the second envelope to other electrical equipment is housed is increased, the effect of which is capable of applying a high voltage gas insulated switchgear is obtained earthing switch.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a connecting portion between outer casings of a gas-insulated switchgear according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram showing a creepage distance of an insulating mounting member according to the present invention.

FIG. 3 is an explanatory diagram showing a creepage distance of an insulating mounting member in a conventional configuration.

FIG. 4 is a cross-sectional view illustrating a configuration of a connection portion between outer jackets of a conventional gas insulated switchgear.

[Explanation of symbols]

11 1st jacket, 11a flange section, 12 2nd jacket, 12a flange section, 13 insulating spacer, 15
Bolt, 16 nut, 17 Insulated mounting member, 17a
Bottom, 17b side, l ₂ creepage distance.

Claims (1)

[Claims] 1. A first outer casing made of a conductive member having a flange portion at an end and containing a grounding switch, and another electric device connected to the grounding switch is stored at an end portion. A second jacket made of a conductive member, an insulating spacer sandwiched between the flanges of the two jackets, and electrically insulating the flanges of the two jackets; Bolts and nuts for tightening and fixing the flanges and the insulating spacer by penetrating and screwing the insulating spacer, and a bowl having a hole through which the bolt penetrates at the bottom and surrounding the head or nut of the bolt at the side. Gas insulation, comprising: an insulating mounting member formed in a shape and pressed between the head or nut of the bolt and one of the flanges by tightening the bolt and nut. Switchgear.