JPH09134651A - Puffer type gas-blast circuit-breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable gas-blast circuit-breaker which can prevent the deterioration of insulating performance even when a conductive foreign matter by hot gas moves in an insulating cylinder. SOLUTION: A fixed main contactor 1 and a movable main contactor 2 are oppositely arranged in a grounding vessel T. A fixed arc contactor 4 is arranged in the fixed main contactor 1, and the grounding vessel T is connected to a puffer part P. An operation rod 3 interlocking with the movable main contactor 2 and an insulating operation rod 16 are arranged in the puffer part P, and the insualting operation rod 16 is connected to an operation mechanism part. The puffer part P is connected to an insulating cylinder support stand 11 through an insulating cylinder 9. A shield 12 is arranged between the insulating cylinder 9 and the insulating cylinder support stand 11, and an inside diameter of an insulating cylinder 13 is gradually expanded toward the insulating cylinder support stand 11 side. A movable arc contactor 5 is arranged on the tip of the operation rod 3, and a puffer cylinder 6 and a puffer piston 7 are arranged in the puffer part P. A hole 3a to make a hot gas flow reach the insulating cylinder 9 side is arranged in the operation rod 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer-type gas circuit breaker used in, for example, a substation of a high-voltage power system, and more particularly to a puffer-type gas circuit breaker having improved internal insulation characteristics. It is a thing.

[0002]

2. Description of the Related Art Although a circuit breaker is indispensable in a substation of a power system, a puffer type gas circuit breaker is used because excellent breaking performance is required especially in a high voltage power system. The puffer type gas circuit breaker has a fixed electrode part and a movable electrode part, which are arranged to face each other so that they can come in contact with and separate from each other, in a grounded airtight container in which an insulating gas such as SF6 gas is sealed. It is provided with a puffer portion that interlocks to compress the gas. In the puffer type gas circuit breaker having such a configuration, the insulating gas compressed by the puffer portion is forcibly blown to the arc current ignited between the fixed electrode portion and the movable electrode portion to extinguish the arc gas during the interruption operation. Therefore, high blocking performance can be obtained.

An example of such a conventional puffer type gas circuit breaker will be described below with reference to FIG. That is, in the grounded container T, the fixed main contactor 1 and the movable main contactor 2 are arranged to face each other in the horizontal direction. In the fixed main contactor 1, a horizontal rod-shaped fixed arc contactor 4 is provided. To the movable main contactor 5 side of the grounding container T, a puffer portion P containing an insulating gas inside is connected. In the puffer portion P, an operation rod 3 that is movable in the horizontal direction in association with the movable main contactor 2 is provided. The puffer portion P is connected to the insulating tube support 11 via the insulating tube 9 through which the insulating gas can pass. An insulating operation rod 16 for insulatingly connecting the operation rod 3 to an operation mechanism portion (not shown) is provided inside the insulating cylinder 9. A shield 12 for electrolytic relaxation of the insulation operating rod 16 is provided between the insulating cylinder 9 and the insulating cylinder support base 11 at the ground potential.

A movable arc contact 5 facing the fixed arc contact 4 is provided at the tip of the operating rod 3. On the movable main contactor 2 side in the puffer part P,
Puffer cylinder 6 that can move in conjunction with the operating rod 3
Are formed. A puffer piston 7 fixed to the puffer portion P side is provided in the puffer cylinder 6.
The insulating gas in the puffer cylinder 6 is compressed by the puffer piston 7 when the operation rod 3 moves to the operation mechanism section side. The puffer cylinder 6 is communicated with the gas flow path formed by the movable main contactor 2 and the movable arc contactor 5, and the insulating gas passing through the gas flow path is blown toward the fixed arc contactor 4 side. ,
The movable main contactor 2 is provided with a nozzle 8.

Incidentally, a part of the hot gas flow after being blown to the fixed arc contactor 4 side is transferred from the puffer portion P to the insulating cylinder 9.
The operation rod 3 is provided with a hole 3a so that it can return to the side.

The circuit opening operation in the above conventional technique will be described. That is, when the circuit breaker is closed, the fixed main contact 1 and the movable main contact 2 are in contact with each other to form an energization path. However, when an opening command is input to the operating mechanism of the circuit breaker, the insulating operation rod is disconnected. The movable main contactor 2 is disengaged from the fixed main contactor 1 in conjunction with 16 and the operating rod 3. At this time, the arc current generated between the fixed arc contactor 4 and the movable arc contactor 5 is maintained as a conduction path. Further, when the operating rod 3 moves to the operating mechanism side, the insulating gas in the puffer cylinder 6 is compressed by the puffer piston 7 and is blown to the arc current through the nozzle 8 to extinguish the arc. Complete.

In order to secure the speed of the insulating gas blown to the arc current, a part of the hot gas flow after being blown to the arc current passes through the hole 3a provided in the operation rod 3 and passes through the buffer. The part P reaches the insulating cylinder 9.
As shown in FIG. 6, such hot gas moves with the conductive foreign matter 10 mainly generated from the sliding portion in the apparatus.

[0008]

However, in the conventional technique as described above, the shield 1 for electrolytic relaxation is provided inside the insulating cylinder 9 and between the insulating cylinder support 11 at the ground potential.
2 are provided. Since the location where this shield 12 is provided corresponds to the course of the above-mentioned hot gas flow, the hot gas flow loses its velocity due to this shield 12, and as a result,
As shown in FIG. 6, the conductive foreign material 10 is likely to stay inside the insulating cylinder 9.

The insulating cylinder 9 is usually designed to be as thin as possible in order to reduce the amount of epoxy resin used as its material. Therefore, as shown in FIG. 6, an inflection point 9 is formed on the inner surface of the insulating cylinder 9 on the puffer portion side.
a is formed, and the residence of the conductive foreign matter 10 is concentrated here. Normally, the electric field inside the insulating cylinder 9 is stronger on the high voltage portion side (puffer portion side in the drawing) and weaker on the ground potential side (operating mechanism portion side in the drawing). Therefore, if a large amount of the conductive foreign matter 10 stays at the inflection point of the inner angle on the high voltage portion side, there is a problem in that the insulating performance may be deteriorated and dielectric breakdown may occur.

[0010] The present invention has been proposed to solve the problems of the prior art as described above.
To provide a highly reliable puffer type gas circuit breaker capable of preventing deterioration of insulating performance even when a conductive foreign substance moves due to hot gas in the insulating cylinder.

[0011]

In order to achieve the above object, the invention according to claim 1 is a fixed electrode which is arranged in a grounding container in which an insulating gas is sealed so as to be horizontally contactable and separable. Part and a movable electrode part are provided, and in the puffer part connected to the grounded container, a connecting operation part for connecting the movable electrode part and an operation mechanism part for driving the movable electrode part and the insulating gas are compressed. A puffer cylinder and a puffer piston for spraying an arc current generated between the electrodes, and a puffer type gas circuit breaker provided with an insulating tube for insulatingly connecting the puffer portion to a supporting member on the side of the operating mechanism. The inner diameter of the cylinder gradually increases from the puffer portion side to the operation mechanism portion side.

In the above-mentioned invention according to claim 1, since the inner diameter of the insulating cylinder is gradually enlarged from the puffer portion side to the operation mechanism portion side, most of the conductive foreign matter is on the high voltage portion side. It cannot be fixed on the section side, and stays on the operation mechanism section side which is the ground potential side.

According to a second aspect of the present invention, in the puffer type gas circuit breaker according to the first aspect, an inflection point is formed at an angle of an inner side surface of the insulating cylinder, and the inflection point is an axis of the insulating cylinder. It is characterized in that it is located closer to the operating mechanism than the central portion in the direction.

In the invention described in claim 2 as described above, the inner diameter of the insulating cylinder gradually increases from the puffer side to the operating mechanism side, and the inflection point on the inner side surface of the insulating cylinder operates from the central portion. Since it is located on the mechanism side, the staying position of the conductive foreign matter is closer to the operation mechanism side, which is the ground potential side, than the puffer side, which is the high voltage part side, and the tolerance for electrolysis conditions is high. Limited to parts.

According to a third aspect of the present invention, a fixed electrode portion and a movable electrode portion, which are arranged to face each other in a horizontal direction so as to freely come into contact with and separate from each other, are provided in a grounding container in which an insulating gas is sealed, and the grounding container is connected to the grounding container. In the puffer part formed, a connection operation part that connects the movable electrode part and an operation mechanism part that drives the movable electrode part,
A puffer type in which a puffer cylinder and a puffer piston for compressing the insulating gas and blowing an arc current generated between electrodes are provided, and an insulating tube for insulatingly connecting the puffer portion to a supporting member on the side of the operating mechanism is provided. In the gas circuit breaker, a shield is provided between the insulating cylinder and the supporting member on the side of the operating mechanism, and the shield has a vent hole through which the insulating gas can pass to the supporting member side. It is characterized by

In the invention according to claim 3 as described above, since the shield provided between the insulating cylinder and the supporting member on the operating mechanism side is provided with the vent hole through which the insulating gas can pass, The hot gas flow generated when the current is cut off can pass through the ventilation hole to the operation mechanism section at the ground potential without interruption.

According to a fourth aspect of the present invention, a fixed electrode portion and a movable electrode portion which are opposed to each other in a horizontal direction so as to be freely contactable and separable in the horizontal direction are provided in a grounding container in which an insulating gas is sealed, and the grounding container is connected to the grounding container. In the puffer part formed, a connection operation part that connects the movable electrode part and an operation mechanism part that drives the movable electrode part,
A puffer type provided with a puffer cylinder and a puffer piston for compressing the insulating gas to blow an arc current generated between electrodes, and an insulating tube for insulatingly connecting the puffer portion to a supporting member on the side of the operating mechanism. In the gas circuit breaker, the insulating gas after being blown to the arc current is coated with an adhesive substance on the inner surface of the puffer portion through which the insulating gas passes until it reaches the insulating cylinder. And

In the invention as described above, the sticky substance is applied to the inner surface of the puffer portion through which the hot gas flow generated when the current is cut off reaches the insulating cylinder. Therefore, the conductive foreign matter that passes along with the hot gas flow is captured by this adhesive substance, and the conductive foreign matter that penetrates into the inside of the insulating cylinder is reduced.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. In addition, the connecting operation portion described in the claims is an operation rod, and the supporting member is an insulating cylinder supporting base. The same members as those in the conventional technique shown in FIGS. 5 and 6 are denoted by the same reference numerals and the description thereof will be omitted.

(1) First Embodiment One embodiment corresponding to the invention described in claims 1 and 2 will be described below as a first embodiment with reference to FIG. 1 is an axial sectional view of an insulating cylinder portion of the puffer type gas circuit breaker according to the present embodiment.

(Structure) First, the structure of the present embodiment will be described. That is, in the present embodiment, the insulating cylinder 13
Is provided with an inclination that widens from the puffer portion side (high voltage portion side) toward the operation mechanism portion side (ground potential side). The inflection point 13a on the inner surface of the insulating cylinder 13 is formed closer to the operating mechanism than the axial center of the insulating cylinder 13.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, the conductive foreign matter 10 penetrates into the insulating cylinder 13 through the puffer portion P by the hot gas flow generated when the current is cut off.
At this time, since the inner diameter of the insulating cylinder 13 gradually increases toward the operation mechanism portion side, most of the conductive foreign matter 10 cannot be fixed on the puffer portion side which is the high voltage portion side,
Eventually, the stay is limited to the inflection point 13a on the operating mechanism side.

(Effect) The effects of the present embodiment as described above are as follows. That is, in general, the insulating cylinder 13
Inside, the electric field on the high voltage side is strong and the electric field on the ground potential side is weak. For this reason, as in the present embodiment, if the staying location of the conductive foreign matter 10 is on the side of the operation mechanism section that is on the ground potential side, there is a margin in terms of electric field conditions, and a decrease in insulation performance is prevented. be able to.

(2) Second Embodiment One embodiment corresponding to the invention described in claim 3 will be described below as a second embodiment with reference to FIG. 2 is an axial sectional view of the insulating cylinder portion of the puffer type gas circuit breaker according to the present embodiment.

(Structure) First, the structure of the present embodiment will be described. That is, between the insulating cylinder 9 and the insulating cylinder support 11 in the present embodiment, the shield 15 for electrolytic relaxation of the insulating operation rod 16 is provided. This shield 1
Vent holes are formed in the lower part of the member 5 so that the insulating gas can pass therethrough.

(Operation) The operation of the present embodiment having the above configuration is as follows. That is, the conductive foreign matter 10 penetrates into the inside of the insulating cylinder 9 through the puffer portion P by the hot gas flow generated when the current is cut off. At this time, since the ventilation hole is provided in the lower part of the shield 15 located on the path of the hot gas flow, the hot gas flow passes into the insulating cylinder support base 11 on the ground potential side without losing its speed. I will go. Therefore, in the conventional technique, the conductive foreign matter 10 stays inside the insulating cylinder 9 due to the loss of velocity of the hot gas flow, but in the present embodiment, the conductive foreign matter 10 stays inside the insulating cylinder 9. It moves to the inside of the insulating tube support 11 without staying.

Even if the conductive foreign matter 10 stays in the insulating cylinder 9 before the current is cut off, the hot gas flow that does not reduce the speed causes the insulating cylinder support 11 to move from the insulating cylinder 9 inside.
Move inside.

(Effect) The effects of this embodiment as described above are as follows. That is, since the flow-conductive foreign matter 10 is prevented from staying by the hot gas flow that does not slow down, the inside of the insulating cylinder 9 can always be maintained in a clean state, and the deterioration of the insulating performance is prevented. .

(3) Third Embodiment One embodiment corresponding to the invention described in claim 4 will be described below as a third embodiment with reference to FIG. Note that FIG. 3 is an axial cross-sectional view of the breaking portion of the puffer type gas circuit breaker according to the present embodiment.

(Configuration) First, the configuration of the present embodiment will be described. That is, in the present embodiment, the adhesive substance 13 is applied to the inner surface of the puffer portion P from the vicinity of the puffer piston 7 to the insulating cylinder 9.

(Operation) The operation of the present embodiment having the above-mentioned configuration is as follows. That is, the conductive foreign matter 10 penetrates into the inside of the insulating cylinder 9 through the puffer portion P by the hot gas flow generated when the current is cut off. At this time, the conductive foreign matter 10 moving by the hot gas flow is captured due to the adhesive substance 13 applied to the inner surface of the portion from the puffer portion P to the insulating cylinder 9. Therefore, the amount of the conductive foreign matter 10 entering the inside of the insulating cylinder 9 is reduced.

(Effects) The effects of the present embodiment as described above are as follows. That is, the conductive foreign matter 10 is captured on the puffer portion P side, but since the inner surface of the puffer portion P is a current-carrying portion and has the same potential, the foreign matter staying there does not affect the insulation performance. . Then, since the amount of the conductive foreign matter 10 penetrating into the inside of the insulating cylinder 9 is reduced, the deterioration of the insulating performance is prevented.

(4) Other Embodiments The present invention is not limited to the above embodiments, and the shape, size, material, etc. of each member can be changed as appropriate. For example, as another embodiment corresponding to the invention described in claim 2, as shown in FIG. 2, the thickness of the insulating cylinder 14 may be increased to provide the inflection point 14a on the ground potential side. It is possible. With this configuration, the conductive foreign material 1
The retention point of 0 can be on the ground potential side, and the mechanical strength can be enhanced by the thick structure. It is also possible to make the inner surface of the insulating cylinder substantially cylindrical and to disperse the retention of the conductive foreign matter over the entire inner surface of the insulating cylinder. Further, the sticky substance according to claim 4 is made of any material as long as it is capable of capturing a conductive foreign substance and has heat resistance capable of withstanding a hot gas flow after arc extinction. Good.

[0034]

According to the present invention, the structure in which the inner diameter of the insulating cylinder is gradually increased from the puffer portion side to the operating mechanism portion side, even if conductive foreign matter is moved by hot gas in the insulating cylinder, It is possible to provide a highly reliable puffer-type gas circuit breaker capable of preventing deterioration of insulation performance.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an insulating cylinder portion in a first embodiment of a puffer type gas circuit breaker of the present invention.

FIG. 2 is an axial sectional view showing an insulating cylinder portion in a second embodiment of a puffer type gas circuit breaker of the present invention.

FIG. 3 is an axial sectional view showing a third embodiment of the puffer type gas circuit breaker of the present invention.

FIG. 4 is an axial cross-sectional view showing an insulating cylinder portion in another embodiment of the puffer type gas circuit breaker of the present invention.

FIG. 5 is an axial sectional view showing an example of a conventional puffer type gas circuit breaker.

FIG. 6 is an axial cross-sectional view showing a conventional insulating cylinder portion of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed main contactor 2 ... Movable main contactor 3 ... Operation rod 4 ... Fixed arc contactor 5 ... Movable arc contactor 6 ... Puffer cylinder 7 ... Puffer piston 8 ... Nozzle 9, 13, 14 ... Insulation cylinder 9a, 13a , 14a ... Inflection point 10 ... Conductive foreign material 11 ... Insulating cylinder support 12, 15 ... Shield 13 ... Adhesive substance 16 ... Insulation operating rod T ... Grounding container P ... Puffer part

Claims (4)

[Claims] 1. A grounded container filled with an insulating gas,
A fixed electrode portion and a movable electrode portion that are arranged to face each other in the horizontal direction are provided so as to be opposed to each other, and the movable electrode portion and an operation mechanism portion that drives the movable electrode portion are connected in a puffer portion connected to the ground container. And a puffer cylinder and a puffer piston for compressing the insulating gas to blow an arc current generated between the electrodes, and an insulating tube for insulatingly connecting the puffer part to a supporting member on the side of the operating mechanism. In the puffer-type gas circuit breaker, the inner diameter of the insulating cylinder gradually increases from the puffer portion side to the operation mechanism portion side. 2. An inflection point is formed at an angle of an inner surface of the insulating cylinder, and the inflection point is located closer to the operation mechanism section than a central portion in the axial direction of the insulating cylinder. The puffer type gas circuit breaker according to claim 1, which is characterized in that. 3. A grounded container filled with an insulating gas,
A fixed electrode section and a movable electrode section are provided so as to be opposed to each other in the horizontal direction so that the movable electrode section and an operation mechanism section for driving the movable electrode section are connected to each other in a puffer section connected to the ground container. And a puffer cylinder and a puffer piston for compressing the insulating gas to blow an arc current generated between the electrodes, and an insulating tube for insulatingly connecting the puffer part to a supporting member on the side of the operating mechanism. In the puffer type gas circuit breaker provided with a shield, a shield is provided between the insulating cylinder and the support member on the side of the operating mechanism, and the shield is ventilated so that the insulating gas can pass to the support member side. A puffer type gas circuit breaker characterized by having holes formed therein. 4. A grounded container filled with an insulating gas,
A fixed electrode section and a movable electrode section are provided so as to be opposed to each other in the horizontal direction so that the movable electrode section and an operation mechanism section for driving the movable electrode section are connected to each other in a puffer section connected to the ground container. And a puffer cylinder and a puffer piston for blowing the arc current generated between the electrodes by compressing the insulating gas, and an insulating tube for insulatingly connecting the puffer part to a supporting member on the operation mechanism side. In the puffer type gas circuit breaker provided with, the insulating gas after being blown to the arc current, the adhesive surface is applied to the inner surface of the puffer portion that passes until it reaches the insulating cylinder. A puffer type gas circuit breaker characterized by being provided.