JPS6011411B2 - disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a gas (for example, SF6) with excellent insulation and arc-extinguishing properties.
The present invention relates to an improvement of a disconnector which is required to switch and close the load of a closed type switchgear, which is filled in a metal case as the main insulating medium, and particularly relates to a disconnector which aims to improve the reliability of insulation.

The configuration of a conventional disconnector is shown in FIGS. 1 and 2.

FIG. 1 shows a closed circuit state, and FIG. 2 shows a closed circuit state, and the same parts are designated by the same numbers. The configuration and function of the disconnector, as well as the conventional problems, will be explained below using these figures. Reference numeral 1 denotes a disconnector container that houses a disconnector at ground potential, and an insulating gas is sealed inside the disconnector container.

Reference numeral 2 denotes an operation unit, and the details of this part are omitted because they are not directly related to the present invention.

Insulating spacers 3 and 4 serve to electrically insulate the outlet portions 5 and 6 of the center conductor from the container 1, and at the same time serve to separate the high pressure gas inside the container from the outside.

Reference numeral 7 denotes an insulating cylinder, which, like the insulating spacer, electrically insulates the operating part 2 and the disconnecting part, and supports it at the same time.

Reference numeral 8 denotes an insulated operating rod, which transmits the driving force generated by the operating section 2 to the movable side of the disconnecting section.

The movable side of the disconnection section mainly consists of an insulating nozzle 10 and a buffer sill 11, which compresses the inside of the buffer chamber 9 during barrier operation, and converts the gas in the buffer chamber 9 into an arc generated between the movable side arc finger 12 and the fixed electrode 13. Spray to extinguish the arc.
Reference numeral 14 represents a current-carrying finger, and 15 represents a main current-carrying finger, which is used when the current value is so large that the rated current cannot be passed using only the arc finger 12 and the fixed electrodes 1 and 3.

Now, since the arc current generated between the movable arc finger 12 and the fixed electrode 13 is the maximum load current, it is on the order of several hundred amperes to several thousand amperes, which is small compared to that of a breaker or the like.
However, so-called arc products are generated due to the evaporation of the electrode material or the decomposition of the gas due to the current switching and closing many times. This arc product, which has various shapes and components, spreads to various parts within the disconnector due to the gas flow during opening and closing, and eventually accumulates at the bottom under the influence of gravity. For example, in FIG. 1, if the insulating spacer 4 is located at the bottom, arc products will accumulate on the creeping part 4a of the spacer, significantly lowering the withstand voltage performance. Additionally, the creeping portion 3a of the insulating spacer 3 also has a quantity of 4
Although less than in part a, arc products still adhere. For this reason, even though the small current switching itself does not pose much of a problem in terms of performance, there is a problem in that the arc products generated thereby reduce the total running strength of the disconnector. In order to solve this problem, it is possible to improve the creepage of the insulating spacers 4, 5, etc., but this may not be possible due to the dimensional limitations of the disconnector itself, or the amount of arc products generated may be too large. The drawback was that the lack of clarity created problems in identifying and determining appropriate design points. The present invention has been made in view of this point, and its purpose is to guide all the arc products generated between the arc electrodes to a predetermined trapping part and prevent them from scattering outside, thereby stabilizing withstand voltage performance. The goal is to obtain the desired disconnection time.

In order to achieve this purpose, a guide plate is installed to give a swirling flow to the downstream side of the gas flow that is blown onto the arc to extinguish it, and a part is also installed to capture the arc products that are sent out to the outermost part by the far force. All arc products are intended to enter here.

An embodiment according to the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 shows a closed circuit state, and FIG. 4 shows an open circuit state. The structure and functions of parts not particularly explained can be considered to be the same as those in FIGS. 1 and 2, and therefore, the same parts are denoted by the same reference numerals. Reference numeral 16 denotes a guide plate for giving swirl to the gas flow, and is arranged in the gas downstream space of the fixed electrode 13.

If this guide plate 16 is seen in the direction of arrow A in FIG. 4, it has a configuration as shown in FIG.
The gas flow blown perpendicularly to the plane of the paper in FIG. 5 is caused to swirl in the direction of the arrow shown in the figure by the guide vanes attached to the guide vanes. Since the arc products have a higher specific gravity than the gas, they are strongly blown away in the radial direction by the centrifugal force of the swirling flow given by the guide plate 16. Reference numeral 18 denotes an insulating tube for guiding a gas flow, which is provided to surround the fixed electrode 13 in order to prevent the gas flow used for arc extinguishing from directly diffusing into the disconnecting device 1.

An arc product capture section 17 is provided in a space downstream of the guide plate 16 to capture arc products blown away in the radial direction by the guide plate 16. A capture chamber 20 is formed within the capture member 17. FIG. 6 is an enlarged explanatory view showing the arc product capturing section, and 16 and 17 indicate the gas flow guide plate and the arc product capturing member, respectively, as described above.

In the figure, solid lines indicate the flow of gas flow. Now, the arc products that are blown away in the radial direction by the action of centrifugal force move in the direction of the dotted line arrow. When the tapered portion is provided, the speed component in the radial direction is partially converted in the direction of the arrow by the tapered portion 22, thereby facilitating movement. Finally, the arc products are transferred to the capture chamber 20 of the capture member 17.
After one electric current was cut off, he was captured here. 2
1 is a capture member mounting screw.

Since arc products generally have the effect of electrostatically adhering to insulating materials, if the trapping member 17 is made of an insulating material, the arc products once captured will be difficult to scatter outside again. As described above, according to the present invention, the hot gas used for arc extinguishing is given a swirling flow by the guide plate 16, and the arc products that are blown away in the radial direction by the centrifugal force caused by this are captured by the capturing member. Therefore, it is possible to exhaust only the gas without arc products, and it is possible to prevent a decrease in the withstand voltage performance of the disconnector due to the creeping surface of the insulation spacer being contaminated by the arc products.

The present invention allows for a margin in the withstand voltage performance of the disconnector, so it is possible to improve the conventional method of increasing the size of the disconnector by taking a large insulation distance and creepage distance of the insulator. , it becomes possible to obtain a reliable disconnector in terms of withstand voltage.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the closed circuit state of a conventional lightning flasher and disconnector, Fig. 2 is a cross-sectional view showing the barrier state of a conventional lightning flasher and disconnector, and Fig. 3 is a cross-sectional view of the conventional lightning flasher and disconnector. FIG. 4 is a cross-sectional view showing the closing state of an embodiment of the drain or cut-off disconnector according to the present invention, and FIG. FIG. 6 is a front view showing one embodiment of the gas flow guide plate used in the present invention, and an enlarged sectional view illustrating the arc product concentrating member of the haze flow or disconnection switch according to the present invention. 1...Disconnection unit storage container, 2...Operation unit, 3
, 4...Insulation spacer, 5, 6...Center conductor outlet, 7...Insulation cylinder, 8...Insulation operation rod, 9...Buffer chamber , 10...Insulation nozzle, 11...Buffer silling, 12...
...・Movable arc finger "13...Fixed electrode,
16... Gas flow guide plate, 17... Arc product capture member, 18... Insulating cylinder, 19... Gas flow guide vane, 20... Arc product capture chamber, 22...
・Arc generation guiding taper part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A disconnector is disposed in a storage container filled with insulating gas, and a piston, cylinder, etc. are provided on the movable side of the disconnector, and the disconnector is interlocked with the disconnection operation of the movable and fixed side electrodes. to cause a pressure increase in the cylinder, and extinguish the arc generated between the electrodes with this high-pressure gas flow, for giving a swirling flow to the gas flow used for extinguishing the arc. Attach the guide plate to the gas downstream side of the fixed electrode,
A disconnector configured to guide gas given a swirling flow by a guide plate to an arc product capture member. 2. The disconnector according to claim 1, wherein a tapered portion is provided at a portion located on the outer periphery of the swirling flow guide plate so that arc products move to the capture member. 3. The disconnector according to claim 1, wherein the arc product capturing member is made of an insulator. 4. The disconnector according to claim 1, wherein an insulating tube having an inner diameter slightly larger than the outer diameter of the movable insulating nozzle surrounding the movable electrode is attached to the fixed side.