JPS58148614A - Gas insulated electric device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to gas-insulated electrical equipment such as a gas-insulated tank having a branch part, and particularly relates to a magnetic flux generated by a current flowing through a right-angled conductor in the branch part. This invention relates to gas-insulated electrical equipment that can suppress heat generation caused by heat.

[Technical background of the invention]

In gas-insulated switchgear, a gas-insulated bus bar is used, which consists of a tank containing insulating gas and a live part. A branch is provided to connect the two. That is, as shown in FIG. 1, a branch tank 2 is integrally attached to an axially intermediate portion of a tank 1, thereby forming an I-shaped tank as a whole. And these tanks 1. Conductors 3 and 4, which are live parts, are inserted into the j. However, at the mounting base of the branch tank 1 of the tank 1, the magnetic flux created by the current flowing through the conductor 1.4 arranged at right angles is multiplied, so a large amount of eddy current flows, resulting in a large temperature rise. For this reason, conventionally, in order to suppress the temperature rise, a part of the branch tank is made of non-magnetic steel to form the branch tank, thereby suppressing eddy currents.

[Problems with background technology]

However, this configuration had the disadvantage of poor workability. In addition, consideration must be given to designing the device by sufficiently controlling the mechanical strength at the joints of different materials. On the other hand, other air equipment is connected to the free end side of the branch tank part, but in some cases the weight of the connected equipment may have to be borne by the branch tank 2 and tank 1. In such cases, the current situation is to increase the thickness of the tank by 1 or 10 mm to withstand the weight burden.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to obtain a gas-insulated electric device that can prevent the temperature rise of the tank of the right-angled conductor portion and improve the mechanical strength of this branch portion. .

[Summary of the invention]

In order to achieve this object, according to the present invention, cooling fins are provided on the outer circumferential surface of the partial outlet portion of a tank having a branched portion and extend in the direction of outlet, and the cooling fins are thereby utilized as a reinforcing material.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. JII2 and FIG. Reference numeral 11 denotes a tank in which a conductor 2z is supported and inserted through an insulating spacer (not shown), and a branch tank 23 forming a branch part in a direction perpendicular to the axial direction is provided at the middle upper part of the tank XI in the axial direction. The protrusion of the branch tank z3 from the tank 21 causes the branch tank 11 to be connected to the tank 2.
1 by welding, or may be integrally led out from the tank 21 by extrusion molding. Branch tank 21
A branch conductor 24 is arranged concentrically therein, and one end of the branch conductor 24 is connected to the conductor z1. As is clear from FIG. 3, the conductor 11 and the branch conductor 24 are each formed hollow and are connected so that the insides of the conductors communicate with each other. Establish a system. A hole 24m communicating with the inside of the branch tank 2J is also provided above the branch part of the branch conductor X4O. On the other hand, a plurality of steel cooling fins 25 extending in the axial direction of the branch tank 13 are provided on the outer periphery of the branch tank z3. Among the cooling fins 25, cooling fins 26 are located near the portion of the branch tank 23 that intersects with a plane perpendicular to the axial direction of the tank 21.

2jB is extended to near the middle of Iis outside tank j1. This will be explained with reference to FIG. When the axis layer of the branch tank 22 perpendicular to the axis of the tank 21 of the branch tank 21 provided on the tanta z1 is defined as mu-B, about 90 mm from the branch conductor 24 with this axis/1tih-8 as the center line.
The cooling fins 25 and 15B attached to the branch tank 21 arranged within an angle of 0 are provided by extending to the tank 21.
The conductor 22 extends to the vicinity where a plane perpendicular to the plane formed by the axis M-B of the branch tank 23 intersects the tank 21.

Accordingly, the cooling fins 25 located in the direction in which the guide 22 extends extend up to the vicinity of the attachment base of the branch tank 23 to the tank z1.

26 is the master tank 21 near the mounting base of the branch tank 21
This is a cooling fin provided on the outer surface.

With such a configuration, an insulating gas is filled in the tanks 11 and 1M, but they are conductors! ! ,! The mounting portion of the branch tank 23 is heated by eddy current due to the magnetic flux created by the current flowing through the branch tank 21, but this heat is effectively dissipated by the cooling fins provided on the outer circumferential surface of the branch tank 21, thereby suppressing excessive heating. I can do it. As shown in FIG. 3, by providing holes through which fluid circulates in the branch conductor 24 and the conductor 22, a relatively low temperature insulating gas is taken in from the hole 22m, and the hole 14 of the branch conductor z4, which is a vertical part, is Convection can be promoted by discharging insulating gas whose temperature has risen relatively from the chamber, and heating of the conductor itself can be prevented. On the other hand, since a portion of the cooling fins 15 extends to the side surface of the tank 11, the mechanical strength of the mounting portion of the branch tank 11 can be improved.

Although the tank configuration forming a T-shape was explained in the above embodiments, the present invention is not limited to this, and
The same method can be applied to a tank shape of a letter or a cross.

〔Effect of the invention〕

As explained above, according to the present invention, in a tank section that houses a conductor in which the conductor housed inside is configured to continuously flow current at right angles, it is possible to prevent the branch tank attachment section of the tank from heating up. To prevent this, cooling fins are provided protruding from the outer peripheral surface of the branch tank mounting base, and among these cooling fins
The cooling fins are installed within a range of approximately 90' from the branch conductor with the center edge of the axis of the branch tank orthogonal to the tank axis extending to the middle part of the tank, so that the cooling fins are effective for heating. It is possible to provide a gas-insulated electric device that can radiate heat and also allow the primary cooling fin to mechanically reinforce the branch tank mounting base.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the conventional branch tank installation part, Figure 2
The figure is a perspective view of one embodiment of the present invention, Figure 3 is a perspective view illustrating a hanging conductor applied to the present invention, and Figure @4 is a diagram illustrating the state in which cooling fins are attached. 21...tank, 22...conductor, 21...branch tank, 24...branch conductor, is, xt;...cooling fin.

Claims (1)

[Claims] a first tank into which a first conductor is inserted;
A 20th tank connected at right angles to the 1st tank through which a 2nd conductor connected at right angles to the 1st conductor is inserted, and the vicinity of the connection base of the 2nd tank with the 1st tank. It consists of a plurality of cooling fins attached to the outer periphery along the axial direction of the third tank, and the second tank has a central edge centered on the axis of the second tank, which is orthogonal to the axis of the first tank among the cooling fins. Gas insulated electrical equipment, characterized in that the cooling fins are disposed within an angle of about 90' from the second conductor of the tank and extend to the middle of the first tank.