JPH08167353A - Gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE: To improve arc elimination capability of a middle and small current area and make stabilized good shutdown performance by moving a movable plate together with open pole operation of a movable contact forward and moving insulation gas between the movable plate and a fixed contact forward. CONSTITUTION: A movable plate 27 is attached to the upper end part of a support plate 26, provided with a lateral rectangular shape made of an insulation material, positioned at the rear part of a guide groove 25 during pole opening, and moved to the forward direction of the groove 25 together with pole opening operation. In the pole opening of a middle and small current area, a rotary shaft 13 rotates counterclockwise, and the plate 27 moves forward via the plate 26 when a movable contact 16 is released from a fixed contact 13 and pole- opened. Consequently, insulation gas of a gas compression chamber 22, that is insulation gas between the contact 13 and the plate 27 is compressed and moves forward, and insulation gas is blown from the blow out port to an arc between both contacts 13 and 16 produced during pole opening for cooling. Thereby insufficient arc rotation is compensated for, the arc is eliminated, and stabilized good shutdown performance can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc rotation type high voltage gas circuit breaker using an insulating gas as an arc extinguishing medium.

[0002]

2. Description of the Related Art A conventional gas circuit breaker has a structure shown in FIGS. In these figures, 1 is a container,
Reference numeral 2 denotes an arc extinguishing chamber formed in the container 1, in which an insulating gas such as SF ₆ gas is sealed. 3 is a lid plate that hermetically closes the rear opening of the container 1, 4 and 5 are on the front surface of the container 1,
Fixed and movable main circuit conductors penetrating underneath, 6 is a rotary shaft that hermetically penetrates through the container 1 and is rotatably provided, and 7 is insulation fixed to the rotary shaft 6 inside the container 1. It is a sex operation lever.

Reference numeral 8 is an arc drive unit provided in the arc extinguishing chamber 2,
Reference numeral 9 is an annular drive coil of the arc drive unit 8 that constitutes the magnetic field generator, and has a hollow portion 10, that is, a gas flow hole in the central portion. Reference numeral 11 is a ring-shaped arc runner of the arc drive unit 8 which is located below the drive coil 9 and to which one end of the drive coil 9 is connected, and 12 is a fixed conductor whose upper end is connected to the main circuit conductor 4 on the fixed side, It is provided so as to penetrate one side of the arc runner 11 and is connected to the other end of the drive coil 9.

A fixed contact 13 is provided at the lower end of the fixed conductor 12 and is located on one side below the arc runner 11. Reference numeral 14 is an insulator that insulates and supports the arc runner 11 on the fixed conductor 12.

Reference numeral 15 denotes a movable conductor whose lower end is rotatably supported by the operating lever 7, and is located below the arc runner 11. Reference numeral 16 is a movable contactor which is provided at the upper end of the movable conductor 14 and which comes into contact with and separates from the fixed contactor 13. The movable contactor 16 is located in the hollow portion of the arc runner 11, that is, substantially on the central axis of the hollow portion 10 when the contact is opened.

Reference numeral 17 designates a movable side main circuit conductor 5 and a movable conductor 1.
5 is a flexible lead wire connected to 5, and 18 is a U-shaped spring retainer fitting provided in the operation lever 7 and having a spring 19 incorporated therein, in the closed state shown in FIG. 8 in which both contacts 13 and 16 are in contact with each other. The movable contact 16 is pressed against the fixed contact 13 by the spring 19.

Next, the operation will be described. FIG. 8 shows the closed state, in which the rotary shaft 6 rotates right and the operation lever 7 rotates right, and the spring 19 causes the movable contact 16 to move the fixed contact 13.
It is pressed against and the input state is maintained.

Next, when the contact is opened, the rotary shaft 6 rotates counterclockwise and the operating lever 7 rotates counterclockwise, the tip of the operating lever 7 presses the lower end of the movable conductor 15, and both contacts 13, 16 are contacted. When the movable contact 16 is separated from the fixed contact 13 as shown in FIG. 9 from the contact state of the contact shown in FIG.
An arc 20 is generated between 16 and as the movable contact 16 moves, the legs of the arc 20 move from the fixed contact 13 to the arc runner 11, and the arc current generated by the arc 20 is generated between the fixed conductor 12 and the arc runner 11. It is guided to the drive coil 9.

The arc runner 11 and the hollow portion 1 of the arc runner 11 are cut off by the breaking current flowing through the drive coil 9.
A magnetic field is generated between the movable contacts 16 located below 0,
A strong electromagnetic force, that is, a rotating force according to Fleming's left-hand rule, is applied to the arc 20, and the arc 20 rotates at high speed around the hollow portion 10 of the arc runner 11 in an insulating gas atmosphere, and the arc 20 is rapidly cooled. , The arc is extinguished at the current zero point and the interruption is completed. Next, when the rotary shaft 6 rotates to the right and the operating lever 7 rotates to the right, the movable contact 16 comes into pressure contact with the fixed contact 13 and enters the closed state.

[0010]

In the conventional gas circuit breaker described above, when the large current range is interrupted, the generated arc driving force is strong and the arc rotation has sufficient arc extinguishing ability. In the case of shutting off, there is a problem that the generated arc driving force is weak, the arc rotation is insufficient, and the arc extinguishing ability is reduced. The present invention aims to provide a gas circuit breaker with the above points in mind, by compensating for the lack of arc rotation at the time of interruption in the small and medium current region, improving arc extinguishing ability, and having stable and favorable interruption performance. To do.

[0011]

In order to solve the above-mentioned problems, a gas circuit breaker of the present invention comprises an arc-extinguishing chamber filled with an insulating gas, and a drive coil provided in the arc-extinguishing chamber and having a hollow portion. An annular arc runner located below the drive coil and connected to one end of the drive coil; a fixed conductor located on one side of the arc runner and connected to the other end of the drive coil; A fixed contact provided on one side below the arc runner, and below the arc runner,
In a gas circuit breaker provided with a movable conductor rotatably provided and a movable contactor which is provided at an upper end portion of the movable conductor, is in contact with and separated from a fixed contactor, and is located substantially on a central axis of an arc runner at opening. The movable plate is located behind the fixed contactor, moves forward in conjunction with the opening operation of the movable contactor, and moves the insulating gas between the fixed contactor and the movable plate forward.

[0012]

In the gas circuit breaker of the present invention constructed as described above, the movable plate located behind the fixed contact is moved forward in conjunction with the opening operation of the movable contact to be fixed to the movable plate. Since the insulating gas between the contact and the contact was moved forward, by blowing insulating gas to the arc generated when the medium- and small-current region was interrupted to cool the arc, the lack of arc rotation was compensated for and the arc extinguishing ability was extinguished. Is improved, and stable and good blocking performance is obtained. Moreover, the structure is simple and can be made compact.

[0013]

EXAMPLES Examples will be described with reference to FIGS. 1 to 7. In these figures, the same symbols as those in FIGS. 8 and 9 indicate the same or corresponding ones. (Embodiment 1) First, in FIGS. 1 to 5 showing Embodiment 1, reference numeral 21 is a gas compression box having an open upper surface, which is supported by the rear surface of the arc drive unit 8 and is positioned behind the fixed contactor 13. are doing. Reference numeral 22 is a gas compression chamber formed by the gas compression box 21, 23 is a divided front plate of the gas compression box 21, and spray ports 24 are formed from both side plates of the gas compression box 21 to both sides of the fixed contact 13. Is formed so as to be inclined. Reference numeral 25 denotes a guide groove formed in the center of the bottom plate of the gas compression box 21 in the front-rear direction.

Reference numeral 26 denotes a support plate having a lower end portion made of an insulator attached to the base portion of the operation lever 7, and an upper end portion inserted into the guide groove 25 and positioned behind the fixed contactor 13. Reference numeral 27 denotes a horizontally-long rectangular movable plate made of an insulating material, which is attached to the upper end of the support plate 26, and is provided with a guide groove 2 when the contact is opened.
It is located at the rear part of 5 and moves to the front of the guide groove 25 in conjunction with the opening operation when the contact is opened. 28 is a movable plate 27 and a support plate 2
6 is a reinforcing plate provided on the rear surface.

When the contact is opened in the small and medium current region, the rotary shaft 6 rotates counterclockwise, the movable contact 16 is separated from the fixed contact 13 and opens, and the movable plate 27 is moved forward through the support plate 26. To the forward direction by compressing the insulating gas in the gas compression chamber 22, that is, the insulating gas between the fixed contact 13 and the movable plate 27, and moving forward, and between the contacts 13 and 16 generated at the time of opening the electrode. Insulating gas is sprayed from the spray port 24 to the arc 20 to cool the arc 20 to compensate for the lack of arc rotation and extinguish the arc 20.

Second Embodiment Next, FIG. 6 showing a second embodiment.
7 and FIG. 7, the same reference numerals as those in FIGS. 1 to 5 indicate the same or corresponding ones, and the following points are added to the first embodiment. That is, the rotary plate 29 is rotatably supported by the support shaft 30 on the lower surface of the bottom plate of the gas compression box 21, and closes the guide groove 25 on the front side of the movable plate 27 when the contact is opened.

When the contact is opened, the movable plate 27 moves forward of the guide groove 25 in conjunction with the opening operation of the movable contact 16, the support plate 26 abuts the rotating plate 29, and the rotating plate 29 rotates. To do. At this time, the rotary plate 29 follows the forward movement of the movable plate 27 and closes the guide groove 25 on the front side of the movable plate 27, and the fixed contact 13 is connected to the arc from the spray port 24 as in the first embodiment. The insulating gas between the movable plate 27 and the movable plate 27 is blown and cooled by the movable plate 27 to extinguish the arc. in this case,
Since the guide groove 25 has a confidential structure, the blocking performance is further enhanced.

Since the space behind the movable plate 27 in the gas compression box 21 does not necessarily need to have an airtight structure, the back plate of the gas compression box 21 is not particularly necessary. Also,
The present invention can be applied to a gas switch.

[0019]

Since the present invention is constructed as described above, it has the following effects. The gas circuit breaker of the present invention comprises a movable plate 2 located behind the fixed contactor 13.
Since 7 is moved forward in conjunction with the opening operation of the movable contactor 16 and the insulating gas between the movable plate 27 and the fixed contactor 13 is moved forward, at the time of interruption of the small and medium current region. By blowing insulating gas to the generated arc to cool it, the lack of arc rotation is compensated, and the extinction ability is improved.
A stable and good blocking performance can be obtained. Moreover,
It has a simple structure and can be constructed in a small size.

[Brief description of drawings]

FIG. 1 is a cut right side view of a first embodiment of the present invention.

FIG. 2 is a partially cutaway enlarged view of another state of FIG.

3 is a cutaway bottom view of a portion of FIG. 2. FIG.

FIG. 4 is a perspective view of a part of FIG.

5 is a perspective view of another part of FIG. 1. FIG.

FIG. 6 is a cut right side view of the second embodiment of the present invention.

7 is a partially cutaway bottom view of FIG.

FIG. 8 is a cut right side view of a conventional example.

9 is a partially enlarged view of another state of FIG.

[Explanation of symbols]

 2 Arc extinguishing chamber 9 Drive coil 10 Hollow part 11 Arc runner 12 Fixed conductor 13 Fixed contactor 15 Movable conductor 16 Movable contactor 27 Movable plate

Claims (1)

[Claims] 1. An arc-extinguishing chamber filled with an insulating gas, a drive coil provided in the arc-extinguishing chamber and having a hollow portion, and located below the drive coil and connected to one end of the drive coil. An annular arc runner, a fixed conductor located on one side of the arc runner and connected to the other end of the drive coil, and a fixed conductor provided on the lower end of the fixed conductor and located on one side below the arc runner. A contact, a movable conductor located below the arc runner and rotatably provided, and provided on the upper end of the movable conductor, contacting and separating from the fixed contact, and substantially the central axis of the arc runner when the contact is opened. In a gas circuit breaker having a movable contact located on a line, the gas circuit breaker is located behind the fixed contact, moves forward in conjunction with the opening operation of the movable contact, and moves between the fixed contact and the fixed contact. It is possible to move the insulating gas of Gas circuit breaker with moving plate.