JPH0447878Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The present invention relates to a gas shield disconnector having a plurality of shield sections, and in particular, the present invention relates to a gas shield disconnector having a plurality of shield sections, and in particular, the present invention relates to a gas shield disconnector having a plurality of shield sections, and in particular, the present invention relates to a gas shield disconnector having a plurality of shield section sections, and in particular, to reduce the size of the bow section ends. This invention relates to a gas shield and disconnector with an improved shield configuration.

[Technical background of the invention and its problems] In recent years, 500KV class gas cylinders and circuit breakers have been developed as grounded tank type circuits and circuit disconnectors, and they have already been installed in many electrical stations such as substations and switchyards, and have a proven track record in operation. It has gained.
This 500KV class gas shield breaker used to be a 4-point breaker with four breaker points, but now the arc extinguishing performance has been improved by improving the arc extinguishing chamber of the breaker. A two-point cutter has already been commercialized. However, for 500KV power transmission, this two-point disconnector will be sufficient in the future.
When the transmission voltage exceeds 500 KV, the voltage burden on two points is too much for the number of shield points, so it is necessary to configure the number of shield points corresponding to each voltage. Therefore, especially UHV above 500KV
In this class, a gas shield disconnector with two or more disconnection points must be used.

However, as the number of shield sections increases, the dimensions of the gas tank that houses the shield sections also become longer and the equipment becomes larger, so consideration must be given to reducing the overall size of the shield sections as much as possible. .

FIG. 3 shows an example of the configuration of a four-point gas cutter and disconnector. In the figure, there are two sheath sections 1
are each composed of two sheath sections 1a and 1b, and each sheath section 1 is supported by an insulating cylinder 2 and fixed inside the gas tank 3. Further, in each of the sheath sections 1, contacts constituting the sheath break points of each sheath section 1 are opened and closed by a mechanical section housed in a mechanism box 4. On the other hand, end shields 5 are provided at the ends of each of the sheath sections 1 facing each other, and gas tanks 3
A connecting conductor 6 for electrically connecting these is attached between each of the sheath sections 1 facing each other at the center.

FIG. 4 shows the cross section 1 inside the gas tank 3.
This figure shows in detail the configuration of the connection between the Nishiya break points 1b and 1b. In the figure, end shield 5
When the contacts operate, the insulating gas (SF ₆ gas, etc.) in the puffer cylinder 8 is pushed by the piston 9,
It has the role of quickly discharging the gas flow blown onto the fixed electrode 11 through the nozzle 10 attached to the tip of the puffer cylinder 8 without affecting others. That is, with the opening operation of the breaker, the SF ₆ gas in the puffer cylinder 8 is pushed by the piston 9 and is blown through the nozzle 10 onto the arc generated from the fixed electrode 11 when the contact is opened, extinguishing the arc. Perform the action. At this time, the SF ₆ gas blown onto the arc becomes SF ₆ gas containing decomposed gas due to the high heat of the arc, so it must be quickly released from inside the sheath section 1 . Particularly, the middle section sill points 1b, 1b
Since these are opposed to each other, the directions of the exhaust gases are reversed and they interfere with each other, so it is necessary to provide the end shield 5. The end shield 5 also has the role of controlling the electric field at the end of the sheath section 1 so that it is not disturbed.

Note that 12 is a stud for attaching the end shield 5 to the sheath section 1. However, in the case of the above structure, separate end shields 5 are provided between the two sheath sections 1b and 1b facing surfaces of the sheath section 1.
is installed, the opposing beam break point 1b,
There is a drawback that the separation distance ₁ between the parts 1b becomes large, resulting in an increase in the size of the whole.

[Purpose of the invention] The present invention was created taking into account the above circumstances, and its purpose is to minimize the size of the sheath and section, thereby making it possible to reduce the size and weight of the equipment. The object of the present invention is to provide an economically advantageous gas insulator and disconnector.

[Summary of the invention] In order to achieve the above object, the present invention has a plurality of sheath sections connected in series that are housed inside a gas tank so that one ends of the sheath sections face each other. By attaching and arranging a common end shield that shields the ends of the two sheath sections facing each other, a common end shield is installed between the ends of the opposing sheath sections. The present invention is characterized in that only one end shield is disposed in the end shield, thereby achieving miniaturization.

[Embodiment of the invention] An embodiment of the invention will be described below. Figure 1 shows an example of the structure of the gas shield disconnector according to the present invention near the shield section. I will only describe the parts. In other words, FIG. 1 omits the end shield 5 of one of the shingle sections 1 (on the right side in the drawing) and the stud 12 for attaching it in FIG. As both sides and section 1
The structure is such that an integrated end shield 13 that has a common end shield is attached. This integrated end shield 13 is attached and supported by studs 12 on the fixed portion side of the bow section 1 on the left side in the figure.

FIG. 2 shows details of the integrated end shield 13 in cross-section. This integrated end shield 13 has a smooth bowl-shaped concave shape on both sides in the axial direction of the bow section in order to quickly guide the left and right gas flows A and B to the outside of the section 1.
Additionally, a counterbore hole is provided on one side for mounting and fixing this.

In the gas shield and disconnector having such a configuration, the end shield to be attached to one of the shield sections 1 facing each other and the studs for attaching this are omitted, so that each shield is omitted. It becomes possible to shorten the dimension between the ends of the section 1 from ₁ to ₂ as shown in the figure. As a result, the overall size of the sheath section 1 can be shortened, and the gas tank 3 can be shortened.
The dimensions of the gas tank 3 can also be reduced, and the amount of SF ₆ gas sealed inside the gas tank 3 can be reduced, making it possible to reduce the weight and size of the device.
Further, when the stud 12 for attaching and fixing the end shield is arranged on only one side as in the embodiment, the number of component parts can be reduced, which is economically advantageous. Furthermore, if the end shield is attached only to one side, it can be easily removed, and the maintenance of the contact portion of the end shield 1 is also extremely easy.

[Effects of the invention] As explained above, according to the invention, a common end shield is installed and arranged between the ends of two opposing shears and shears to shield the ends of these shears and shears. As a result, the number of end shields for both ends and sections is reduced to one, which makes it possible to minimize the size of the end shield and reduce the size and weight of the equipment, which is also economically viable. Advantageous gas insulators and disconnectors can be provided.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a sectional view showing the configuration of the end shield in the same embodiment, Figure 3 is a general configuration diagram showing a four-point gas shield disconnector, and Figure 4 is a diagram showing the shield disconnection connection part in Figure 3. FIG. 1... Sheath section, 2... Insulating tube, 3... Gas tank, 4... Operation box, 5... End shield, 6
... Connection conductor, 8 ... Puff cylinder, 9 ...
Piston, 10... Nozzle, 11... Fixed conductor,
12... Stud, 13... End shield.

Claims (1)

[Claims for Utility Model Registration] (1) In a gas tank in which a plurality of shingles connected in series are housed in a gas tank such that one end of the shingles face each other, two A gas sheath disconnector characterized in that a common end shield for shielding the ends of both the sheaths and shears is installed and arranged between the ends of the opposing sheaths and shears. (2) The gas shield and disconnector according to claim (1) of the utility model registration, wherein both sides of the end shield in the axial direction are smooth and have an owl-shaped concave shape.