JPS6041619Y2 - butsing - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in bushings used in high voltage equipment.

Conventionally, gas bushings have been used as bushings for gas insulated equipment, but this type of bushing
It is also planned to be used in OKV class (UHV) equipment.

However, in UHV, since the voltage is extremely high, the length of the insulator tube becomes long, and various measures are required to control the electric field. A so-called stress cone gas bushing has been proposed in which these capacitances are connected in series and constitute an electric field control member.

FIG. 1 shows an example of this stress cone gas bushing.

That is, SF, which is an insulating medium, and gas 2 are sealed in the insulating tube 1, which is constructed as a single unit.

A high-voltage center conductor 3 whose upper portion is supported by a support metal fitting (not shown) is inserted into the insulator tube 1 and supported by an insulating support 4 at the lower end of the insulator tube 1 .

A capacitor-type insulating unit 5. 6. 7 are arranged in an axially stacked manner and their capacitances are connected in series.

In this case, the capacitor-type insulating units 5, 6, 7 are configured such that the cylindrical radius becomes smaller toward the upper stage.

The mounting structure of the capacitor type insulation units 5, 6.7 is fixed to each other by flanges.

Since the bushing having such a structure uses a standard insulator tube manufactured for a bushing with an oil-immersed paper type insulation structure, the inner diameter of the insulator tube becomes thinner toward the top.

For this reason, the capacitor-type insulator unit has no choice but to adopt a stacked structure in which the cylinder radius becomes smaller toward the top, and the structure becomes more complicated.

Furthermore, the total length of LJHV insulator pipes is approximately 1077L, and it is difficult to manufacture a single insulator pipe that has earthquake resistance and mechanical strength against internal pressure.

Therefore, the purpose of this invention is to create an LJ that can easily improve the withstand voltage by combining approximately 500KV insulator tubes.
The purpose is to provide a bushing suitable for HV.

Examples of this invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing an embodiment of the bushing of this invention, and the same parts as in FIG. 1 are given the same reference numerals.

The insulator tube 1 is, for example, a standard insulator tube for 500KV, and an insulating medium such as SF6 gas 2 is sealed inside the insulator tube.
6 gases 2 are separated by insulating supports 4.

The gas pressure is selected to be lower than that of the lower SF6 gas 18.

The upper part of the center conductor 3 is supported by a support metal fitting (not shown) in the cooler 10, and the lower part of the porcelain tube 1 is supported by a support insulator 4.

A cylindrical insulator tube 12 is provided below the support insulator 4, and S
SF6 gas 18 with a higher pressure than F6 gas 2 is sealed, and there is a capacitor type insulator unit 13 for electric field control inside.
are arranged concentrically.

This capacitor type insulator unit 13 has a cylindrical insulator tube 12
Since the cylinder is housed inside, there is no need to make the radius of the cylinder smaller toward the upper stage; for example, it can be made into an integral cylindrical insulating cylinder.

The top and bottom of the capacitor type insulator unit 13 are flange 1.
6.17, and are electrically connected to the center conductor 14 at 100% potential by a flange 17 and to the main body tank 15 at zero potential by a flange 16, and at the same time are mechanically fixed and held.

Further, the center conductor 14 and the center conductor 3 are connected through the support insulator 4 portion.

Air shields 8 and 9 are provided above and below the outside of the insulator tube.

In this embodiment, since the cylindrical insulator tube 12 is connected to the conventional insulator tube 1 through the insulating support 4, it is possible to easily provide a multi-voltage class bushing by simply changing the length of the cylindrical insulator tube 12. is completed.

In addition, since the insulator pipe is divided into gas sections, high pressure S is applied to the entire insulator pipe.
Since the F6 gas does not act as internal pressure, the mechanical strength can be lowered and the weight can be reduced.

Furthermore, since the capacitor type insulator unit 13 is arranged concentrically within the cylindrical insulator tube 12, the electric field of the insulator tube 1 and the cylindrical insulator tube 12 can be sufficiently controlled, and a bushing with excellent withstand voltage characteristics can be obtained. can be provided.

FIG. 3 shows another embodiment of the present invention, in which the support insulator 4 is omitted and upper and lower gas pressures are divided by a capacitor type insulator unit 13 for electric field control.

The center conductors 3 and 14 are connected at the flange 17.

Components that are the same as those in FIG. 2 are given the same reference numerals, and their explanation will be omitted.

As mentioned above, according to this invention, for example, by using a standard bushing insulator for 500KV and a cylindrical insulator, and dividing the insulator into two, high-pressure gas can be introduced into the cylindrical insulator located below. By enclosing the potential control member, the potential along the longitudinal direction of the insulator tube can be controlled by the potential of the capacitance of the potential control member, thereby providing a bushing suitable for UHV with excellent withstand voltage characteristics and a simple configuration. can.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing an example of a conventional bushing;
The figure is a longitudinal sectional view showing one embodiment of the bushing according to this invention, and FIG. 3 is a longitudinal sectional view showing another embodiment of the invention. 1.12...Insulator tube, 2,18...Insulating medium, 3.14...High voltage center conductor, 4...
...Supporting insulator, 5.6.7. 13...Capacitor type insulator unit, 8,9...Air shield, 10...Cooler, 15...Main tank, 16.17. ...Flange.

Claims (1)

[Scope of utility model registration request] In a bushing in which a center conductor is arranged concentrically within an insulating tube filled with an insulating medium, and a capacitor-type insulator unit is arranged concentrically with the center conductor inside the insulator tube, the insulator tube is divided into gas sections and divided into two parts. The first insulator tube accommodates the first center conductor concentrically, and is formed into a cylindrical shape with the second insulator tube. A bushing in which second center conductors are concentrically housed inside, and the first center conductor and the second center conductor are connected on the same axis.