JPS5935331A - Gas insulated switch - 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 switch with improved voltage resistance between electrodes.

[Technical background of the invention]

Currently, gas insulated switchgears filled with an insulating gas such as SF or l gas are mainly equipped with a buffer type arc extinguishing chamber. Currently, most circuit breakers have a buffer type arc extinguishing chamber. This arc-extinguishing room has been remodeled to be able to withstand ST, F, and BTF due to the recent rise in power transmission pressure. Furthermore, the current 500 kV power transmission circuit breakers usually have four breaking points, but as arc chambers become more sophisticated, circuit breakers with two arc cutting points are becoming more popular. It has come to appear.

A conventional arc extinguishing chamber includes a fixed electrode part, a movable electrode part facing the fixed electrode part, a buffer part adjacent thereto, and a cylindrical insulating member that covers at least the fixed and movable electrode parts. . The buffer section side of this arc extinguishing chamber is connected in series with another arc extinguishing chamber via a center piece, and the movable electrode section and the movable side of the buffer section are connected to an operating section via a link mechanism section.

The fixed electrode portion includes a fixed electrode that is dammed to a fixed electrode support member, a fixed current-carrying contact that surrounds the fixed electrode, and a shield that covers the tip and outside of the fixed current-carrying contact.

The movable electrode portion, which is a fixed electrode support member, is provided opposite to one end surface of the buffer cylinder of the buffer portion. The movable electrode portion is fixed to one end surface of the buffer cylinder so that the inner portion of the cylindrical movable electrode and the hollow portion of the operating rod are communicated with each other.

A gas passage is formed around the outer periphery of the cylindrical movable electrode, an insulated nozzle is attached to a buffer cylinder, one end of the insulated nozzle is fixed to the buffer cylinder, and a movable current-carrying contact is provided on the same side of the fixed electrode.

The buffer section forms a buffer chamber with a buffer cylinder and a buffer piston housed inside the buffer cylinder. The seven buffer chambers and the gas flow path are communicated through a gas ejection hole. Further, a cylindrical insulating member is installed between the 7 flange provided on the outer support member of the buffer piston and the 7 lange of the fixed electrode support member of the fixed electrode portion so as to cover the fixed and movable electrode portions.

An operating rod, one end of which is fixed to the buffer cylinder, is connected to the operating section via an insulating rod and a link mechanism.

[Problems with background technology]

In the arc extinguishing chamber formed in this way, when the movable electrode section is driven by a cutoff command, first the fixed and movable current-carrying contacts open, then the fixed and movable electrodes open, and an arc occurs between the two electrodes. During this operation, insulating gas is sprayed onto the arc from the compressed buffer chamber to extinguish the arc and complete the interruption.

However, even if an attempt is made to cut off the rated voltage and current by reducing the number of breaking points in the conventional arc extinguishing chamber, the fixed and movable current-carrying contacts will first open apart during the breaking operation, but the movable current-carrying contact will open. Due to the polar operation, turbulent flow occurs in the surrounding insulating gas, so the withstand voltage between the fixed and movable current-carrying contacts decreases, and there is a risk that an arc will occur between them, resulting in failure to shut off. Therefore, in order to reduce the number of breaker points, downsize the breaker itself, lower manufacturing costs, and reduce the installation area, the breaker performance of the arc extinguishing chamber must be further improved, which is a problem that needs to be solved. was there.

JObject of the Invention The present invention has been developed in consideration of the above points, and its purpose is to reduce the number of breaking points, reduce the size of the switch itself, and reduce manufacturing costs and installation area. The objective is to provide a gas insulated switch that can measure the

[Summary of the invention]

In order to achieve this object, the present invention houses an arc extinguishing chamber in which a fixed electrode part and a movable electrode part are covered with a cylindrical insulating member inside a grounded tank filled with insulating gas, and allows the entire movable electrode part to be operated. The fixed electrode part is provided with a fixed electrode and a fixed current-carrying contact so as to surround this, and the pole part is provided with a movable electrode and a fixed current-carrying contact that surrounds the fixed electrode part. By providing a movable current-carrying contact in the movable current-carrying contact and providing a cylindrical external cylinder around the outer periphery of this movable current-carrying contact, the breaking performance of the arc extinguishing chamber is improved, the number of breaking points is reduced,
It is characterized by reducing manufacturing costs and installation area.

In addition, the external cylinder is made up of an opening at the tip of the movable current-carrying contact and a hakama part formed to expand on the side opposite to the fixed electrode part, and furthermore, the peripheral end of the hakama part is attached to the inner wall of the cylindrical M member. It is preferable to form them close to each other.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas insulated switch according to an embodiment of the present invention will be described below with reference to the drawings. A plurality of arc extinguishing chambers are connected in series and housed inside a grounded tank (not shown) filled with an insulating gas such as SF or L gas, and an operating section for operating the movable side of these arc extinguishing chambers is provided for gas insulation. Configure the switch.

The arc extinguishing chamber aυ has a fixed electrode section (121) as shown in Figure 1.
, a movable electrode part (14) facing this, and a buffer part (151) provided adjacent to this, a fixed and 0 [electrodynamic].

It is formed to include a cylindrical part side a61 that at least surrounds the pole part Q21, (13). Buffer section 05)
is connected to other arc extinguishing chamber (
(not shown), and the movable side of the movable holding part (13) and the buffer part αω are connected to a working part (not shown) via a link mechanism part an'tc.

Note that the cylindrical feeding member α6) 11-1 is formed from an insulating cylinder or a cylindrical capacitor member.

The fixed electrode portion a is provided with a fixed electrode a wound attached to the fixed electrode support member side, a fixed current-carrying contact CXPJt surrounding the fixed electrode a, and a shield (20) covering the tip and outside of this fixed current-carrying contact (20). 20a) 'i provide.

In addition, the movable electrode part (13 is
The buffer part (151 buffer cylinder (2υ) has a cylindrical movable electrode (2'jJ and a hollow part (23a) on one end surface of the buffer cylinder (2υ)
Fix the operating rod I2 with the k. An insulated nozzle (to) with a gas flow path (25a) formed on the outer periphery of a cylindrical movable electrode (221) is attached to a buffer cylinder (2υ), and one end of this insulated nozzle e9 is fixed to the buffer cylinder c!0, and this fixed Install a movable current-carrying contact (A) around the area.

A cylindrical external cylinder (5) is provided on the outer periphery of the movable current-carrying contact 0e. As shown in Figs. 1 and 2, this external cylinder (2 cylinders are the movable energizing contact co side side and the buffer cylinder (shoulder part (21a) of 2B) (!: f
It is formed like this. Additionally, an opening (27a) formed by the side surface of the external cylinder (271 is the movable current-carrying contact (A)) and the outside of the side surface of the buffer cylinder 01 so as to expand toward the opposite side from the fixed electrode part 0. It is formed from a hakama part (27b) formed in. Further, the inner side of the outer cylinder (2η) and the buffer cylinder (20) are fixed to each other via a support member (27c).The outer cylinder Q°C is formed of an insulating member such as Teflon (trade name) or a metal member.

The buffer 7 portion Q51 forms a buffer chamber 0υ with the buffer cylinder I2o and the buffer piston (g) housed therein. This buffer chamber 01) is provided with a cylindrical lumen member (t*f: installed) between the gas flow path flange ←→ and the fixed electrode support member 7 (18a) of the fixed electrode support member 1→ of the fixed electrode portion 0δ. The operating rod C3, which has one end fixed to the cylinder Cυ, is connected to the insulating rod C321 and the link mechanism part 0.
7) to an operating section (not shown).

Note that a check valve (30a) is provided on the buffer piston (toward).

Next, the effects of the present invention will be explained. As shown in FIG. 3, since an external cylinder (2) is provided concentrically around the outer periphery of the movable current-carrying contact (c), the fixed and movable current-carrying contact t2G, (2[ 1) When the gap opens □, the insulating gas is compressed by the skirt part (27b) of the external cylinder Qη along with the operation of the buffer cylinder (2+), and is transferred from the opening (27a) to the side of the movable current-carrying contact (a). Spray three gas streams C as shown by the arrows along the line.In this way, a uniform gas stream (c) is applied to the side of the movable current-carrying contact (a).
In order to spray a (From 11, the compressed gas is turned into a gas flow □□□ indicated by the arrow, and the arc is extinguished.

If the interrupting performance of the busy arc extinguishing chamber (11) is improved in this way, the number of interrupting points of the breaker can be reduced, and the manufacturing cost and installation area can be reduced.

Note that the external cylinder (27) may be made of Teflon (trade name), but it is formed of a metal member so that when the fixed and movable current-carrying contacts C21tJ and @ open and separate, the electric field on the movable current-carrying contact (a) side It can act as a shield to alleviate the
In particular, the voltage resistance when the fixed and movable current-carrying contacts (a) and @ are separated can be improved. Note that FIG. 4 shows a state in which the arc extinguishing chamber H has completed opening.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6, in which the same parts as in FIG. 1 are given the same reference numerals. Hakama part (27b) of external cylinder (5) 'i Especially cylindrical canopy member t
It is formed in a cylindrical shape close to the inner wall of te, and as the buffer cylinder c21) moves, the outer cylinder (2
In order to compress the insulating gas inside the hakama part (27b) of 7), the gas flow t37) ejected from the opening (27a) is greater than the gas flow C35) shown in FIG. 3 of the first embodiment of the present invention. Since a powerful gas flow is blown along the movable current-carrying contact (E), it is possible to suppress the generation of arc between the fixed and movable current-carrying contacts (2) and @.

〔Effect of the invention〕

That's all I hate, Akira 1. As described above, the gas insulated switchgear according to one embodiment of the present invention has the advantage that by improving the carp extinguishing ability of the arc extinguishing chamber, the number of breaking points can be reduced, and manufacturing costs and installation surface disturbances can be reduced. .

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the arc extinguishing chamber of a gas-insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing the external cylinder of FIG. 5 and 6 show the states of the arc extinguishing chamber in the middle of opening and after completion of opening, respectively, in FIG. 1. FIGS. It is a vertical cross-sectional view showing the following. (11)... Arc extinguishing chamber, (I4... Fixed electrode part. 03... Movable electrode part, 09... Buffer part. α0... Cylindrical knowledge member , Q7)...Link mechanism section. Or...Fixed electrode support member, (2)...Fixed electrode. Wing...Fixed current-carrying contact, (2+1...Buffer cylinder. (2)...・Movable electrode, 關...Operating rod. I2...Insulating nozzle, (25a)・if SRM. (2G)...Movable current-carrying contact, <27+...External cylinder. (27a)...・Opening, (27+))...Hakama part. 00)...Buffer piston, shout)...Buffer chamber. 0, (column, Qη...Gas flow agent Patent attorney Inoue - Male Figure 1 Figure 3?? Figure 4

Claims (3)

[Claims] (1) An arc extinguishing chamber in which a fixed electrode part, a movable electrode part, and a buffer part are surrounded by a cylindrical member is housed in a grounded tank filled with insulating gas, and the movable side of each of the movable electrode part and buffer part is The fixed electrode part is provided with a fixed electrode and a fixed current-carrying contact so as to surround the fixed electrode part, and the movable electrode part formed with respect to the fixed electrode part is provided with a movable electrode. A gas insulated switch characterized in that a movable current-carrying contactor is provided so as to surround the movable electrode, and a cylindrical external cylinder is provided around the outer periphery of the movable current-carrying contactor. (2) The gas insulated switch according to claim 1, wherein the external cylinder is formed with an opening opening at the tip of the movable current-carrying contact and a hakama part expanding to the side opposite to the fixed electrode part side. . (3) The gas insulated switch according to claim 2, wherein the peripheral end of the skirt portion of the external cylinder is formed close to the inner wall of the cylindrical member.