JPS5889736A - Buffer type gas breaker - 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 The present invention relates to a buffer-type gas breaker, and more particularly to a buffer-type gas breaker in which an insulating gas flow path for spraying from a buffer part through an insulating nozzle in a movable electrode part is improved.

Gas circuit breakers using an insulating gas such as 8F or gas as an arc-extinguishing medium have excellent circuit breaker performance at high voltages and are therefore the mainstream of high voltage circuit breakers. In particular, a buffer part is formed from a cylinder and a piston inserted into the cylinder, and when the contact is opened, the piston or cylinder is moved at the same time as the contact point, compressing the 8F gas in the buffer chamber, and extinguishing the arc by blowing it. Type gas circuit breakers are often used.

FIG. 1 shows the state of the breaking operation of the breaking section of such a conventional buffer type gas breaker. When the breaker performs a breaker, ie, ``open'' operation from a closing, ie, "closed" state, an operating rod (not shown) connected to an operating device (not shown)
1a) by driving the ξ rough cylinder (1),
8F of the buffer chamber (3) formed by the buffer cylinder (1) and the buffer piston (2), compressing the insulating gas, such as gas. This compressed gas passes through the gas flow path (4a) of the jet hole (1b) and the insulated nozzle (4) to the fixed electrode (
5) and the movable electrode (6) by blowing an insulating gas onto the arc generated between the movable electrode (6) and the movable electrode (6) to extinguish the arc.

However, when the current value increases with the increase in the capacity of the circuit breaker, the energy of the arc becomes extremely large, causing the problem that it cannot be adequately controlled by spraying the insulating gas. The gas ejected from the buffer chamber (3) becomes a high-speed gas flow passing through the gas flow path (4a).
It is customary to dissipate the arc energy by means of a gas flow towards the opening of the insulating nozzle (4), the so-called throat (4b) I, or towards the hollow part (5 m) of the movable electrode (5) and the operating rod (1 m). However, when the arc energy increases in this way, some of the energy leaks between the fixed current-carrying contact (6) and the movable current-carrying contact (7) due to convection or radiation, and the leaked energy is transferred to gas. Since it is difficult to be carried away by the current, there is a risk that it becomes a high-temperature gas and stagnates, inducing dielectric breakdown between the fixed and movable current-carrying contacts (6) and (7) due to the re-electromotive voltage at the current zero point. there were.

The present invention has been made in consideration of the above points, and an object thereof is to provide a buffer type gas breaker that can improve the breaking performance.

An embodiment of the present invention will be described below with reference to FIG. The breaker 1Q shown in FIG. 2 is housed in a tank (not shown) together with an insulating gas such as 8F gas, and is connected to an operating device (not shown) to form a buffer type gas breaker. The breaker section consists of a fixed electrode section I and a buffer section a1 provided adjacent to a movable electrode section a facing thereto. This buffer portion 0 forms a buffer chamber aη from a buffer cylinder (c) and a buffer piston ae.

Further, the buff de cylinder member provided with the movable electrode portion αa is connected to an operating device (not shown) via an operating rod ae.

The fixed electrode part I has a fixed electrode part attached to the center of the mounting member (lla), a fixed current-carrying contact (to) is provided so as to surround the outer periphery of the fixed electrode part, and a fixed current-carrying contact (to) is provided so as to cover this fixed current-carrying contact (2). A shield (21 is provided.

A rotary electrode (2) formed hollow and facing the fixed electrode 0 is provided on the outside of the bottom (15g+) of the A rough cylinder cylinder 9 facing the fixed electrode part housing υ, and a gas flow path (2) is provided on the outside of the movable electrode @. form the insulating nozzle (to) and attach the insulating nozzle (to). This woven edge nozzle (E) is installed with a fixed current-carrying contact (
7) A movable current-carrying contact (e) is provided opposite to. Also, the gas flow path (c) is located at the bottom of the buffer cylinder 19 (15g).
It communicates with the buffer chamber αD through an ejection hole (15b) drilled in the.

Furthermore, the insulated nozzle @ has a gas flow path (c) that opens in the center.
In addition to the inner insulating nozzle (25a) of the insulating nozzle (c),
) and the outer insulating nozzle (25b) are coaxially divided into two parts, and the gap provided between the two forms a parallel gas flow path. The ejection hole (15c) in the bottom part (15a) is formed so as to communicate with the buffer chamber αD.

Then, the knocker cylinder 4 is inserted into the buffer chamber α.
The buffer piston (IQ) that forms .Hollow part (2) of movable electrode (to)
The operating rod a barrel having a hollow part (18a) communicating with the buffer piston (1!) and the piston support member (
2) and is connected to an operating device (not shown) via an insulating rod (not shown). Also, the circumferential end (llb
) and the outer support member (28a) of the piston support member (c).
) A cylindrical insulating member is installed coaxially between the two. Note that a slide contact 6υ is attached to the contact attachment member (2) which is weird to the piston support member (2) so as to come into sliding contact with the outer peripheral surface of the buffer cylinder ttS.

Next, the operation and effects of the buffer type gas breaker of the present invention will be explained. Although not shown in the figure, when the cutoff part (1G) is in the closed state, when a cutoff command is transmitted to the operating device, the operating rod ← barrel is driven to the right in the figure as shown in Figure 2, and the movable electrode part a3 and buffer The cylinder (15) is driven to the right. With this operation, the fixed current-carrying contact (a) and the movable current-carrying contact (e) are first separated.

Subsequently, as the fixed electrode Ql and the movable electrode (2) begin to separate, the insulating gas inside the buffer chamber aη is compressed. Furthermore, when the fixed electrode ill and the movable electrode @ are opened and an arc 021 is generated between both electrodes, the insulating gas inside the nozzle chamber αη is further compressed, and the gas flow path (2) is The arc (2) is extinguished by blowing compressed insulating gas to the arc (2) through the ejection hole (15c) and the parallel gas flow path.

To further explain such an arc extinguishing operation, the arc energy generated at the fixed electrode 0 and the movable electrode section is caused by the high-speed gas flow in the gas flow path (2) of the insulated nozzle (2) accompanying the electrode opening operation. Most of it will be carried away. However, when the opening (25c) of the insulated nozzle (c) is finally pulled out from the fixed electrode l, when the current peak is reached, the high-speed gas flow does not effectively act on this arc energy, so a part of it is inside. It remains near the tip of the insulated nozzle (25m). Furthermore, as the current zero point approaches, the inner insulating nozzle (25m) moves further away from the fixed electrode field 1, so the relatively low temperature gas flow obtained in this state remains near the tip of the inner insulating nozzle (25a). It does not act sufficiently on arc energy. However, the compressed high-pressure gas in the buffer chamber aη can be blown onto the remaining arc energy from the parallel gas flow path (5) to create an image. Therefore, by scattering the high-temperature gas that may stagnate between the fixed current-carrying contact (to) and the movable current-carrying contact (e), the occurrence of dielectric breakdown between the inner current-carrying contacts (4) and (1) will occur. Arcs can be prevented.

Note that the insulating nozzle (c) has parallel gas flow paths (the two have different effective lengths and shapes depending on the breaking current. For example, as shown in Figure 3, the inner insulating nozzle (25a) and the outer insulating nozzle It is formed to have almost the same length as the nozzle (25b),
This has the effect of easily scattering the hot gas that is stagnant near the tip of the inner insulating nozzle (25a).

In FIG. 4, by forming the tip of the outer insulating nozzle (25b) to cover the tip of the inner insulating nozzle (25m), it is possible to scatter the hot gas particularly near the tip of the inner insulating nozzle (25a). .

In FIG. 5, a plurality of parallel gas flow passage holes (27a) are formed approximately equally spaced in the axial direction and concentrically of the insulating nozzle (C) main body to constitute a parallel gas flow passage. The hot gas scattering effect is similar to that of the embodiment of the present invention, and furthermore, the inner and outer insulated nozzles can be formed integrally, so the insulated nozzle (c)
This has the advantage of making installation easier.

Furthermore, as shown in FIG.
A buffer cylinder (16a) is provided inside the buffer piston (16a), and a buffer piston (16a)
) and (16b) to form inner and outer chambers (17a) and (17b). The inner groove chamber (17a) communicates with the gas flow path (c) via the ejection hole (15b), and the outer buffer chamber (17b) communicates with the parallel gas flow path surface via the ejection hole (15c). .

As in the embodiment of the present invention described above, if the buffer chamber a7) is common to the gas flow path (c) and the parallel gas flow path (material), it takes a certain amount of time to obtain the gas pressure necessary for shutoff. The cross-sectional area of the installed gas flow path cannot be made that large.

However, in order to carry away the residual arc energy, it is more effective to carry away the remaining arc energy by forming parallel gas passages with a large cross-sectional area rather than using a high-speed gas flow. Therefore, by forming double inner and outer buffer chambers (17a) and (17b), the cross-sectional area of the parallel gas flow path can be increased, and the gas pressure in the one inner buffer chamber (17a) can be reduced. Effective shutoff can be performed without being affected.

In the above-mentioned embodiments, a 1-point break) circuit breaker has been described, but a 2-point break) circuit breaker in which two breaker parts Ql are connected in series or a 2-point break circuit breaker can be used as a unit, and a plurality of these units are connected in series. Of course, it is possible to form a multi-point cut-off breaker with more than just a short cut.

As explained above, according to the buffer type gas breaker of the present invention, the high temperature hot gas remaining at the tip of the insulating nozzle is scattered by forming the parallel gas flow paths coaxially in the axial direction in the insulating nozzle body. Therefore, it is possible to prevent re-ignition and improve the shut-off performance.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing the breaking section of a conventional sofa-type gas breaker; Fig. 2 is a longitudinal cross-sectional view of the breaking section of a seven-guise sofa-type gas breaker showing an embodiment of the present invention; Fig. 3; 4 is a longitudinal cross-sectional view of a main part of another embodiment of the present invention, FIG. 5 is a front plan view of FIGS. 3 and 4, and FIG. 6 is a longitudinal cross-section of a main part of another embodiment of the present invention. It is a front view. OI... Breaking part, uto... Fixed electrode part, 0 area...
Movable electrode part, 0-stop...Buffer part, 0-stop...
Buffer series, /da, (15b), (15c)...
・Blowout hole, (Let (16a), (16b) ・”
'tsu7ahiston, (17), (17m), (1
7b)-Puff 7a chamber, H-...operating rod, (1'J-
・・Fixed electrode, (to) ・・Fixed current-carrying contact, 4...
・Movable electrode, (c)... Gas flow path, (c)... Insulated nozzle, (25a)... Inner insulated nozzle, (25b)
...outer insulated nozzle, (to)...movable current-carrying contact,
(Foundation) -- Parallel gas passage, (27a) Parallel gas passage hole, (To) Arc. Agent Patent Attorney Mr. Inoue Figure 3 Figure 4 Figure A

Claims (6)

[Claims] (1) A breaker section consisting of a fixed electrode section, a movable electrode section facing the fixed electrode section, and a buffer section provided adjacent to the movable electrode section is housed in a tank filled with insulating gas,
Compressed gas supplied from the nozzle part is sprayed onto an arc generated between the fixed electrode of the fixed electrode part and the movable electrode of the movable electrode part through an insulated nozzle provided on the movable electrode at the time of shutoff. A buffer type gas breaker which extinguishes an arc, characterized in that the insulating nozzle is provided with a parallel gas flow path along the axial direction. (2) The insulating nozzle is coaxially divided into two parts and formed into outer and inner insulating nozzles, and the parallel gas flow path is formed by a gap provided between the outer and inner insulating nozzles. The buffer type gas breaker according to item 1. (3) The buffer type gas breaker 1 according to claim #I2, wherein the outer and inner insulating nozzles have substantially the same axial length, (4) The buffer type gas breaker according to claim 2, wherein the tip of the outer insulating nozzle is formed so as to cover the tip of the inner insulating nozzle. (5) The buffer type gas breaker according to claim 1, wherein the parallel gas passages are formed by a plurality of parallel gas passage holes opened along the axial direction of the insulating nozzle body. (6) The buffer-type gas breaker according to claim 1, wherein the buffer chambers of the buffer section with which the central gas flow path of the insulating nozzle and the parallel gas flow paths communicate are separately formed.