JPS5921204A - Gas insulated switching 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 a gas insulated switchgear! (This article relates to a gas insulated switchgear with improved layout grooves in a cage-shaped gas insulated switchgear.

[Background Art and its Problems] The configuration of the arrangement 51 of a gas insulated switchgear, which is often manufactured in recent years, is i'+ as shown in FIG. 1, for example.
'! has been completed. In the figure, 1 is a grounded horizontal tank that contains SF and gas, and the P1 tongue is stored in it.
26.2 is a pneumatic bushing, which is placed on the female part of the breaker 1 at the one end of the switchgear.

The other terminal part is placed on the tank of the disconnector 3 installed at the other end of the disconnector 1. A portion of the terminal of each aerial bushing 2 is connected to an atmospheric insulated aerial bus or a line lead. One terminal section 4 of the switching device 3 is connected to a terminal section 4' of the breaker via a through-type current transformer 5 in the middle.

A terminal portion 8 of an earthing switch 7 is provided at a terminal portion 6 connected to the bushing 2 of the disconnector 3. In addition, a lightning arrester 9 is installed to ensure insulation coordination between the gas-insulated switchgear and lightning surge, and the terminal section 9' of the lightning arrester 9 is connected to the terminal section 6 of the disconnector 3 by a conductor 10. A capacitance type intermediate ii to detect the voltage on the line side using ! 1
iill is arranged coaxially and cylindrically with the conductor 10.

In such a configuration, since the earthing switch 7 is arranged at a relatively upper portion of the disconnector 3, various sliding metal powders are generated as the earthing switch 7 operates, and these metal powders can be used to disconnect the disconnector. One terminal part 4 of the disconnector 3 falls through the tank of the disconnector 3.
is deposited on the insulating spacer] 2 supporting the insulating spacer.

If the metal powder adheres to the insulating spacer 12 in this way, it will cause deterioration of the insulation ability when the gas insulated switchgear is used for many years. Especially in recent years, large-scale and large-capacity power transmission (55
0.12 (200 mm or more) is becoming a reality, and the switching responsibilities of the earthing switch, which has been used in gas-insulated switchgears already applied to such 5 transmission systems, are becoming more conventional. In comparison, it is more severe, and as an example of its switching ability, an induced current interruption of 90 KV to 1500 A is required. In order to provide the earthing switch with such opening/closing ability, a gas blowing function, so-called buffer blowing, or the like is employed at the contact portion. Therefore, the frequency of inspection of such earthing switch 7 and disconnector 3 will increase.

In other words, the amount of dust generated when the conductive current is turned on or off will inevitably increase, and as this will accumulate on the insulating spacer 12, the dielectric strength of the insulating spacer 12 will decrease, resulting in a contamination-resistant type with a long creepage insulation distance. Since it becomes necessary to consider the use of an insulating spacer or a spacer with a larger circumference, the frequency of inspection will be increased to deal with the decrease in dielectric strength. However, because the disconnector's tongue resistor has the bushing 2, terminal section 6, center conductor, grounding switch 7, conductor 10, etc. arranged in different locations, it is difficult to disconnect each electrical connection or work in tight spaces. If you do not do this, there are drawbacks.

[Purpose of the invention]

The present invention has been made in view of the above points, and aims to provide a gas-insulated switchgear that can improve the workability of inspecting a grounding switch and at the same time improve the reliability that can cope with the era of large-capacity power transmission. .

[Configuration of Example]

An embodiment of the present invention will be described below with reference to FIG. In the figure, 21 is provided inside a horizontally placed grounded tank, with a connection 22 protruding from a bushing 21a with one end established above the tank. 23 is a current transformer placed outside the conduit 23a of this terminal portion 22. 24 is a breaker 21 for the pipe line 23a.
located at the opposite end of the tank, housing the disconnect section in the tank,
The disconnector is completely filled with insulating gas, and the movable contact 25, which is one terminal portion thereof, is connected to one terminal portion 22 of the breaker 21 via an insulating spacer 24dtl-. The fixed contact 26, which is the other terminal portion, is led out into a bushing support tank 28 that establishes an air bushing 27 through a connecting pipe 24c having an insulating spacer 241). fi7124a is IJ1 of disconnector 24! ! This is part i1. The bushing support tank 28 is provided further in the axial extension of the disconnector 24 provided in the axial extension of the breaker 21, so the breaker 21, the disconnector 24, and the bushing support tank 2 are connected in a straight line. To be done K
Become. The bushing support tank 28 and the disconnector 24 have a vertically elongated shape extending perpendicularly to the axial direction of the tank of the breaker 21, and a bushing 27 is established at the upper end of the bushing support tank 28. There is.

A movable contact 29a of the earthing switch #29 is provided on the bushing support tank 28, which faces the fixed contact 26 of the disconnector 24. A contactor 291) is provided. The movable contactor 29a is operated by the operating device 29'C. Disconnector 2
The lid 24e on the top of the tank No. 4 can be opened and closed to close the tank. Insulating gas is sealed in the bushing support tank 28, and an internal element 28a is housed in the tank to constitute a lightning arrester. The internal housing 28a is connected to the conductor in the bushing support tank 28 through the conductor valve, and is also connected to the fixed contact 2 of the disconnector via the conductor of the connection pipe 24c.
Connected to 6.

By adopting such an arrangement, it is possible to cope with the increase in the number of circuit breakers 21, which has continued to make remarkable progress in recent years. In other words, improving the breaking performance tends to reduce the number of breaking points by half. For example, the 300Kv class is changing from 2 points to 1 point, and the 550 class is changing from boiling to 2 points. This means that the axial length of the tank of the breaker 21 can be shortened. However, bushing 2
1a, 27 In order to ensure the air insulation distance between the heads, when considering a single ladder or disconnector, it is necessary to install the bushing at an angle to the tank. However, in the composite switchgear, by rationally arranging each component, there is no need to arrange the bushing at an angle. That is, erecting the bushing at right angles to the breaker tank axis is easy in terms of seismic strength and setting the strength of the opening of the bushing erected portion, and the tank is also easy to manufacture. 'Also, ensure the air distance between the bushings-J
2. Place a new path between the bushings.
The required distance is secured from J. -A50 as an example
If the break point is 2 points and a bushing is installed on the disconnect switch, the distance will be about 4.5 m, which is smaller than the minimum required distance of 5 m for the insulation H, but the present invention If it is established on the bushing support tank 28 as shown in the figure, it will be about 6 In, which is set at a sufficient distance. On the other hand, the switching responsibilities of the grounding switchgear applied to large-capacity power transmission networks have become severe, as detailed in fiii, and although the amount of shutoff dust increases, the structure does not include a bushing over the disconnector. Since the lid 24e of the disconnector tank can be used as an opening for inspection, internal inspection can be easily performed. Unlike a manhole, this cover 24e has a sufficiently large opening, so that the contacts can be inspected without having to remove the earthing switch 29 from outside. By housing the internal element 28a of the lightning arrester within the bushing support tank 28, there is no need to take measures regarding the location of the comparatively large electric appliance. In the above embodiment, the trap flow device 23 is installed with a conduit 2.3a for draining, but this conduit is omitted and the breaker tank and the disconnector tank are directly connected. Good too.

Therefore, according to the configuration of the present invention, the required insulation distance between the bushings can be ensured even when a small breaker is applied and the insulation properties are good as a composite switch/closing system applied to the AL power transmission system. In addition, by reducing the size of the substation as a whole without providing unnecessary busbars, and by arranging the bushings at both ends in a straight line, the overall layout of the substation is improved. .

〔effect〕

As explained below, according to the present invention, it is possible to further downsize the circuit breaker, and to do so, a special busbar device is interposed between all the intermediate parts just to ensure the air insulation distance of the bushing. When the earthing switch reaches the required number of operations (for example, 200 times as the inspection standard for earthing switchgear with current switching capability) by separating the disconnector and the earthing switchgear with gas. The gas in the disconnector tank that houses the earthing switch is recovered, and the contacts can be easily inspected from the lid that forms a sufficiently wide opening. of the device δ, (L flow,
Shutoff dust from opening and closing was deposited on the insulating spacer. 1) It has the advantage of being able to be easily inspected even if the

[Brief explanation of the drawing]

FIG. 1 is a general configuration diagram of a configuration prior to the present invention, and FIG. 2 is a schematic configuration diagram showing an embodiment 11 of the present invention.

Claims (1)

[Claims] (1) Horizontal grounded tank type in which a first bushing is established on the - side, the center conductor of this first bushing is connected to one terminal part, and all the - and disconnected parts are housed and insulating gas is filled. A breaker on the other side of this breaker and a breaker on the axially extending part of a grounded tank is a breaker in which a disconnecting part is housed in a tank that is connected to the gas compartment and is filled with insulating gas. , A gas compartment of the disconnector is connected to the opposite side of the disconnector from the breaker, and the extension of the ground tank tlt11 is connected to the disconnector. A bushing support tank filled with an insulating gas 11- and a second bushing established on the upper part of the bushing support tank are installed 118, and a part of the other end of the breaker section is connected to the disconnection section. One pole side is connected via a conductor, and the other pole side of the disconnection section is connected via a conductor to the center conductor of the bushing and also to the internal elements of the lightning arrester housed in the bushing support tank. 'l
A gas insulated switchgear characterized in that a lid that can be opened and closed is provided on the upper surface of the tank of the disconnector, and a grounding switchgear is housed in the disconnector tank.