JPH05314873A - Puffer gas circuit breaker equipped with closing resistance - Google Patents

Abstract

PURPOSE:To provide a puffer gas circuit breaker equipped with an excellent closing resistance, having high electrical and mechanical reliability and capable of contributing to miniaturization of the whole circuit breaker and being good at properties regarding assembly, and maintenance and inspection. CONSTITUTION:A puffer gas circuit breaker has an arc extinguish chamber 4 enclosed in and insulatively supported to a container 1 having an insulative gas sealed therein, a closing resistance 27 electrically connected in parallel to the arc extinguish chamber 4 and used for restraining overvoltage when a circuit is made, and a closing resistance contact portion 5 electrically connected in series with the closing resistnace 27. An insulative support means 102 for insulating and supporting the closing resistance 27 to and from the container 1 independently of the arc extinguish chamber 4 and an electrical connection means 103 for removably connecting the closing resistance 27 between the fixed portion 6 of the arc exthiguish chamber 4 and the fixed portion 22 of the closing resistnace contact portion 5 are provided. The electrical connection means 103 has generally a sliding power application structure (104, 105) or a structure with an intervening elastic body 118 therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker with a closing resistance, and more particularly to a puffer type gas circuit breaker with a single-point closing resistance.

[0002]

2. Description of the Related Art With the increase in capacity of power transmission systems, circuit breakers used in substations and switchyards have increased breaking capacities.
Moreover, high reliability is required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of circuit breakers is reduced. For example, a 550 kV two-point breaker circuit breaker is currently in practical use, but it is required to further break it into one point.

By the way, in a circuit breaker for a line in a large capacity system such as a class of 550 kV, a closing resistance system is adopted in order to suppress a closing overvoltage at the time of closing. In this closing resistance system, a closing resistance contact having a closing resistance is closed in parallel with the main contact of the circuit breaker, and the closing contact suppresses the closing overvoltage to close the main contact. Further, in this method, it is necessary that the closing resistance contact is first opened and then the main contact is opened at the time of interruption.

As a method of driving the closing resistance contact,
In the 2-point cut puffer type gas circuit breaker, conventionally, for example,
A structure as shown in FIG. 11 is considered. That is,
The puffer type gas circuit breaker of FIG. 11 is configured by housing two blocking portions 2 in a horizontal container 1 in which an insulating gas is sealed. And these two interruption | blocking parts 2 are arrange | positioned symmetrically, are connected in series via the support member 3, and are each comprised from the arc-extinguishing chamber 4 and the making resistance contact part 5. Since these two blocking portions 2 have exactly the same configuration, one blocking portion 2 is omitted in the drawing.

First, the arc extinguishing chamber 4 is provided with a fixed portion 6 and a movable portion 7 which are arranged to face each other in the horizontal direction. Of these, the fixed portion 6 is configured by integrally fixing a fixed finger 8 that normally conducts a current, a fixed arc electrode 9, a fixed-side shield 10, and a fixed support 11 made of a conductive material that supports these. Further, the movable portion 7 is configured by integrally fixing a movable electrode 12, a movable arc electrode 13, an insulating nozzle 14, an operation rod 15, and a puffer cylinder 16 made of a conductive material, which pass a normal current. On the other hand, in order to support the movable part 7, a supporting insulating cylinder 17 and a supporting insulating cylinder shield 18 fixed to the flange portion 1 a of the container 1 are provided, and in addition, a movable support 19 fixed via the supporting member 3. Is provided, and the movable support 7 supports the movable portion 7. Further, the puffer cylinder 16 and a puffer piston 20 forming a compression chamber are fixed to the movable support 19. Further, the movable support 19 has an insulating rod 21
The fixed portion 6 is fixed via the and is supported by the movable support 19. The insulating rod 21 may be an insulating tube or a capacitor.

Next, the closing resistance contact portion 5 includes a closing resistance contact fixing portion 22 and a closing resistance contact movable electrode 23, which are arranged opposite to each other.
Is equipped with. Of these, the closing resistance contact fixing part 22 is
It is fixed to the fixed support 11 via an insulating member 24.
The closing resistance contact fixing portion 22 includes a closing resistance contact fixed electrode 25 and a spring 26 that movably supports the closing resistance contact fixed electrode 25. Then, in the opened state, the spring 26 is used to hold the closing resistance contact fixed electrode 25 in such a manner as to protrude toward the closing resistance contact movable electrode 23 side. Further, the closing resistance contact movable electrode 23 is mechanically fixed to the arm-shaped protruding portion 12a formed by extending the flange portion of the movable electrode 12, and
It is electrically connected.

In this case, the restoring speed of the spring 26 of the closing resistance contact fixing portion 22 is so high that the closing resistance contact movable electrode 23 can be restored.
Is selected to be slower than the moving speed of
The closing resistance contact portion 5 and the arc extinguishing chamber 4 are configured such that the wipe of the electrode of the closing resistance contact portion 5 is larger than the wipe of the electrode of the closing resistance contact portion 5. That is, as described above, at the time of closing, the closing resistance contact portion 5 is first closed, and then the arc-extinguishing chamber 4 which is the main contact is closed, and at the time of interruption, the closing resistance contact movable electrode 23 causes the arc-extinguishing chamber 4 to be closed. Even when the movable portion 7 moves at the same speed, the closing resistance contact portion 5 is opened first, and then the arc-extinguishing chamber 4, which is the main contact, is opened.

On the other hand, the closing resistor 27 is arranged on the back surface of the breaking portion 2 and has one end thereof with the closing resistor contact fixing portion 22.
Mechanically fixed and electrically connected in series. The other end of the closing resistor 27 is mechanically fixed to the fixing support 11 via a conductor 28 and is electrically connected thereto. Therefore, the closing resistance 27
Is mechanically supported by the movable support 19 together with the fixed portion 6 via the insulating rod 21.

The operating rod 1 of the movable portion 7 of the arc extinguishing chamber 4
A drive source (not shown) in a mechanism box 30 arranged below the container 1 is connected to the motor 5 via an insulating operation rod 29 arranged in the vertical direction. And this mechanical box 3
Due to the vertical movement of the insulating operating rod 29 by the drive source in 0, the operating rods 15 of the breaking portions 2 on both sides move horizontally in opposite directions, and the movable portion 7 and the closing resistance contact movable electrode 23 of each breaking portion 2 move. It is configured to move together. More specifically, the operating rod 15 includes the sliding member 3 provided on the inner surfaces of the puffer piston 20 and the movable support 19.
1, 32, the puffer piston 20 and the movable support 1
9 is slidable. The operating rod 15 is connected to the insulating operating rod 29 via the link 33 and the lever 34. With this configuration, the driving force of the insulating operating rod 29 is converted in the horizontal direction and transmitted to the operating rod 15. It is like this. Further, the mechanism box 30 is fixed to the flange portion 1 a of the container 1, and the two blocking portions 2 are provided via the flange portion 1 a and the supporting insulating cylinder 17.
Supports the whole.

[0010]

By the way, when the two-point cut puffer type gas circuit breaker configured as described above is made into a single-point cut, as shown in FIG.
Therefore, the supporting member 3 for connecting the blocking portions 2 is omitted, and the movable support 19 is directly fixed to the supporting insulating cylinder 17 and the supporting insulating cylinder shield 18. Further, since it is not necessary to convert the driving force transmission direction into two directions, from the viewpoint of simplification of the configuration, the insulating operation rod 29 and the mechanism box 30 are sequentially connected on the operation axis of the operation rod 15 to form a mechanism. The driving force from the box 30 is linearly transmitted to the operation rod 15. Along with the arrangement of the mechanism box 30, the supporting insulating cylinder 17 is fixed to the partition wall 30a between the mechanism box 30 and the container 1, and the mechanism box 30 causes the entire blocking section 2 to pass through the supporting insulating cylinder 17. To support.

As described above, when the puffer type gas circuit breaker with two cut points is cut into one point, the cutoff portion 2 including the arc extinguishing chamber 4 and the closing resistance contact portion 5 is simply from two to one. It can be halved, and its configuration and operation are basically the same as those of the breaking unit 2 of the puffer type gas circuit breaker of FIG. On the other hand, regarding the closing resistor 27 attached to the breaking unit 2,
Since a constant resistance value is required according to the system to which the circuit breaker is applied, it cannot be simply halved, and the weight of the closing resistance attached to one circuit breaker becomes relatively large. This point will be described below.

That is, the closing resistance 27 is determined in consideration of the conditions of the closing voltage and the closing time when the breaker is closed, and the withstand voltage performance is sufficient to withstand the closing voltage and the electric energy input at the closing. It must have sufficient capacity to withstand. Moreover, when the insulating member 24 is used as a member for supporting the closing resistor 27, the temperature rise of the closing resistor 27 due to the input electric energy must be such that the insulating member 24 is not damaged.

Since the resistance value of the closing resistor 27 is determined based on the above conditions, the puffer type gas circuit breaker with one-point cut is the same as the puffer type gas circuit breaker with two-point cut. The resistance value of is required.
In other words, in the one-point cut puffer type gas circuit breaker,
In the two-point cut puffer type gas circuit breaker, the closing resistances 27 which are divided and arranged in the two breaking portions 2 are collectively attached to the single breaking portion 2. Specifically,
By cutting the puffer type gas circuit breaker into one point,
The weight of the closing resistor 27 attached to each breaking unit 2 is about twice the weight of the closing resistor 27 attached to each breaking unit 2 at the time of two-point cutting. Further, as a material for forming the closing resistor 27, generally, heavy ceramics are used, so that the closing resistor 27 is considerably heavy. In this case, the closing resistor 27 is supported by the movable support 19 together with the fixed portion 6 via the insulating rod 21 as described above. Therefore, if the closing resistance 27 becomes heavy, a considerable load is applied to the insulating rod 21, and the following problems may occur.

That is, when the weight of the closing resistor 27 increases, the fixing portion 6 of the breaking portion 2 vibrates due to the operational vibration generated when the circuit breaker is operated, and the insulating rod 21 accordingly.
Excessive stress may occur in the and the mechanical strength may be threatened. Further, as a result of the fixed portion 6 vibrating due to the operation vibration generated when the breaker is operated, the center position of the fixed arc electrode 9 may be displaced and deviated from the center position of the movable arc electrode 13. When the circuit breaker makes a closing operation in response to a closing command with the center positions of the arc electrodes 9 and 13 of the arc extinguishing chamber 4 deviated in this way,
And the fixed arc electrode 9 collide with each other, and these arc electrodes 9 and 13 may be damaged. Further, it is assumed that the influence on the mechanical strength of the supporting insulating cylinder 17 that supports the entire blocking unit 2 from the mechanism box 30 cannot be ignored.

On the other hand, in making a one-point cut, the closing resistances 27, which were arranged by being divided into two breaking sections 2 in a two-point cutting puffer type gas circuit breaker, are collectively attached to a single breaking section 2. If you do, not only the weight, but also the closing resistance 27
Since the size of the circuit breaker is also about doubled, there is a problem that the miniaturization of the entire circuit breaker is limited. Further, the assembly work of fixing the closing resistor 27 at one end to the closing resistor contact fixing portion 22 and at the other end to the fixed support 11 via the conductor 28 requires a certain technique and time. further,
When the closing resistor 27 is arranged on the back surface of the shutoff portion 2, there is also a problem that it is difficult to approach the electrode portion during maintenance and inspection of the arc extinguishing chamber 4.

The present invention has been proposed in order to solve the problems of the prior art as described above, and its purpose is to have a high electrical and mechanical reliability and to contribute to downsizing of the circuit breaker as a whole. It is an object of the present invention to provide a puffer type gas circuit breaker with an excellent closing resistance, which is easy to assemble and maintain.

[0017]

According to the present invention, an arc-extinguishing chamber, which is housed in a container in which an insulating gas is sealed and is insulated and supported with respect to the container, is electrically connected in parallel with the arc-extinguishing chamber. In a puffer-type gas circuit breaker with a closing resistor having a closing resistor for suppressing an overvoltage at the time of closing and a closing resistor contact portion electrically connected in series with the closing resistor, the arc extinguishing chamber with respect to the container. Separately from the above, insulating support means for insulating and supporting the closing resistance, and electrical connection means for detachably connecting the closing resistance between the fixing portion of the arc extinguishing chamber and the fixing portion of the closing resistance contact portion are provided. It is characterized by in this case,
The electrical connecting means is generally a sliding current-carrying structure or a structure with an elastic body interposed.

[0018]

In the present invention having the above structure,
By insulating and supporting the closing resistance separately from the arc extinguishing chamber with respect to the container, the load of the closing resistance is applied to the insulating members such as the insulating rod supporting the electrodes of the breaking section and the supporting insulating cylinder supporting the breaking section. Never. Therefore, even if operational vibration occurs during operation of the circuit breaker, there is no possibility that the center position between the electrodes of the circuit breaker will be displaced, and it is possible to prevent the electrodes from colliding or being damaged due to the displacement.

Further, the closing resistance is electrically connected between the fixed portion of the arc extinguishing chamber and the fixed portion of the closing resistance contact portion by the electrical connecting means, so that the closing resistance can be preceded when the breaker is closed. .. In particular, when the electrical connection means is a sliding current-carrying structure or a structure in which an elastic body is interposed, operating vibration generated when operating the circuit breaker is not directly applied to the closing resistance. Further, by providing the electrical connection means for detachably connecting the closing resistance between the fixing part of the arc extinguishing chamber and the fixing part of the closing resistance contact part in this way, it is easy to attach / detach to / from the closing part of the closing resistance. become.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of puffer type gas circuit breakers with closing resistors according to the present invention will be described below with reference to FIGS.
It will be specifically described with reference to. In this case, FIG. 1 is a typical embodiment (first embodiment) of a puffer type gas circuit breaker with a closing resistor according to the present invention, FIGS. 2 and 3 are second embodiments, and FIGS. 3rd Example, FIGS. 6-8 shows 4th Example,
9 and 10 show the fifth embodiment, respectively. The same parts as those in the conventional technique shown in FIGS. 11 and 12 are designated by the same reference numerals and the description thereof will be omitted.

First, the first embodiment shown in FIG. 1 will be described. In the embodiment shown in FIG. 1, a breaking unit 2 is housed in a horizontal container 1 containing an insulating gas, and the breaking unit 2 is composed of an arc extinguishing chamber 4 and a closing resistance contact unit 5. Is similar to the conventional one-point puffer type gas circuit breaker shown in FIG. And again, between the electrodes of the blocking section 2,
That is, the point between the fixed part 6 and the movable part 7 is supported by the insulating rod 21, and the blocking part 2 is the supporting insulating cylinder 17.
The point of being supported by is also the same as that of the prior art of FIG.

However, in this embodiment, the configuration around the closing resistor 27 is completely different from that of the prior art shown in FIG. That is, as shown in FIG.
Is fixed to the container 1 separately from the arc-extinguishing chamber 4 by a closing resistance supporting insulating cylinder (insulating supporting means) 102 via a supporting insulating cylinder shield 101. This closing resistance 27
Is two closing resistors 27a of equal length divided into two,
27b, and two closing resistors 27a and 27b.
Are arranged side by side and electrically connected in series via the supporting insulating tube shield 101. And closing resistance 27a
And the fixed support 11 of the fixed portion 6 and the closing resistance 27b.
A removable electric connection portion (electrical connection means) 103 is formed between the closing resistance contact fixing portion 22 and the closing resistance contact fixing portion 22. The electrical connection portion 103 is composed of a male contactor 104 provided on the closing resistors 27a and 27b, and a female contact portion 105 provided on the fixed support 11 and the closing resistance contact fixing portion 22, and further, In the concave portion of the female contact portion 105, the sliding current collector 10 is provided so that the male contactor 103 can be energized.
6 is provided. In this case, the electrical connection portion 10
As the configuration of 3, on the contrary, a configuration is also possible in which the female contacts 105 are provided on the closing resistors 27a and 27b, and the male contacts 104 are provided on the fixed support 11 and the closing resistor contact fixing part 22.

In the present embodiment having the above-described structure, the closing resistance 2 is provided by the closing resistance supporting insulating cylinder 102.
Since 7 can be independently insulated and supported with respect to the container 1, as in the conventional case, it is put into an insulating member such as an insulating rod 21 that supports between the electrodes of the breaking unit 2 or a supporting insulating cylinder 17 that supports the breaking unit 2. The load of the resistor 27 is not applied. Therefore, since the vibration load of the closing resistor 27 due to the vibration acceleration during the operation of the circuit breaker is not applied to the circuit breaker 2 side, the vibration displacement of the fixed portion 6 can be significantly reduced compared to the conventional circuit breaker, and the insulating rod It is possible to remarkably reduce the operation load applied to 21 and the supporting insulating cylinder 17.

Further, the closing resistor 27 is connected to the electric connecting portion 103.
By this, since the electrical connection is made between the fixed portion 6 and the closing resistance contact fixing portion 22, the closing resistance 27 can be preceded when the breaker is closed. In particular, in the present embodiment, since the electric connection portion 103 has the sliding current-carrying structure, the operating vibration generated when operating the circuit breaker is not directly applied to the closing resistance 27. Furthermore, in this way, the electrical connection 10
3 has a sliding current-carrying structure composed of a male contactor 104 and a female contact portion 105, the closing resistance 2 is blocked by the closing portion 2
Can be easily attached and removed.

As described above, according to this embodiment,
A large load of the closing resistance 27 is not applied to the insulating members such as the insulating rod 21 and the supporting insulating cylinder 17 of the breaking unit 2, and conversely, the operating vibration generated when the circuit breaker is operated, and the closing resistance 27 are not directly applied. Since the displacement of the fixed portion 6 of the blocking portion 2 can be reduced remarkably as compared with the prior art, it is possible to prevent the damage due to the collision of the electrodes and improve the electrical / mechanical reliability. Further, in this embodiment, since the closing resistors 27 are divided into two and arranged side by side, there is an advantage that the circuit breaker as a whole can be reduced in size as compared with the case where they are simply arranged on a straight line. Further, the electrical connection portion 103 allows the closing resistance 2
Since 7 can be easily attached to and detached from the cutoff portion 2, good assembling and maintenance inspection can be obtained.

Next, a second embodiment shown in FIGS. 2 and 3 will be described. The basic configuration of the embodiment shown in FIGS. 2 and 3 is the same as that of the first embodiment. However, in the present embodiment, the closing resistor 27 and the electrical connection portion 1 are
The configuration of 03 is different from that of the first embodiment. That is, as shown in FIG.
A doughnut-shaped resistance element 113 is laminated between 1 and 112, an insulating rod 114 is arranged so as to penetrate the hollow portion of the resistance element 113, and the resistance element 113 is pressed by a spring 115. Has been done.

In the present embodiment, the closing resistance 27
As shown in FIG. 3, a coil-shaped spring 118 is arranged between the plates 116 and 117 at both ends of the electric connection portion 103 provided between the fixed support 11 and the fixed resistance contact fixing portion 22. Both ends of the spring 118 have spring retainers 119.
Are fixed to the plates 116 and 117 respectively, and further, the metal foil 120 is wound around the spring 118. The metal foil 120 is provided to apply a resistance current to the electrical connection portion 103 when the closing resistance contact is energized, whereby the plate 116 on one side and the plate 117 on the opposite side via the metal foil 120 are provided. A current path leading to is formed. Further, as the material of the metal foil 120, a material having a high electric conduction performance such as copper is used. The electric connection portion 103 is fixed to the closing resistor 27 by a fixing means such as a bolt. In this case, on the contrary, a configuration in which the electrical connection portion 103 is fixed to the fixed support 11 and the closing resistance contact fixing portion 22 is also possible.

In the present embodiment having the above-mentioned structure, the plate 117 on one side of the electric connection portion 103 is brought into contact with the fixed support 11 and the closing resistance contact fixing portion 22, so that the closing resistance 27 and the fixing support 11 are formed. And the closing resistance contact fixing portion 22 are electrically connected. In this case, the flat surface of the plate 117 may be simply brought into contact with the flat surface of the fixed support 11 and the closing resistance contact fixing portion 22 which is wider than this flat surface, so that the alignment work during assembly can be facilitated. Further, the contact load of the energizing contact portion between the electric connection portion 103 and the fixed support 11 and the closing resistance contact fixing portion 22 can be easily adjusted by appropriately setting the spring coefficient of the spring 118 and the deflection amount during use. is there. Further, since the spring 118 is interposed between the breaking unit 2 and the closing resistance 27, it is possible to effectively prevent the vibration during operation from being directly transmitted to the closing resistance 27. In addition, in the present embodiment, since the insulating rod 114 is configured to penetrate the hollow portion of the resistance element 113, the outer peripheral surface of the resistance element 113 is entirely in the gas, so that it occurs when the resistance is turned on. It is effective for promptly releasing heat, and can improve the withstand capability of the circuit breaker and also improve the mechanical strength.

Next, a third embodiment shown in FIGS. 4 and 5 will be described. In the embodiment shown in FIGS. 4 and 5,
The basic structure is the same as in the first and second embodiments. However, in this embodiment, the configurations of the closing resistor 27 and the electrical connection portion 103 are different from those of the first and second embodiments. That is, as shown in FIG. 4, the two closing resistors 27a and 27b, which are divided into two and arranged, are each provided with the insulating cylinder 121 between the shields 111 and 112 at both ends.
The resistance element 122 is laminated inside the insulating cylinder 121,
The resistance element 122 is configured to be pressed by the spring 115. Note that the two closing resistors 27
Similarly to the first embodiment, a and 27b are arranged side by side and electrically connected in series via the supporting insulating cylinder shield 101 to form a closing resistor 27.

In the present embodiment, the closing resistance 27
a, 27b, fixed support 11 and closing resistance contact fixing portion 22
As shown in FIG. 5, the electrical connection portion 103 provided between the pair of holes is provided with a plurality of pairs of holes on opposite surfaces of the plates 116 and 117 at both ends. Stick 123
For example, a plurality of rods made of a material having high current-carrying performance and elasticity, such as copper, are formed by being inserted. The electric connection portion 103 is fixed to the closing resistors 27a and 27b by a fixing means such as a bolt. In this case, the electric connection portion 103 may be fixed to the fixed support 11 and the closing resistance contact fixing portion 22.

In this embodiment having the above-mentioned structure, the plate 117 on one side of the electric connecting portion 103 is brought into contact with the fixed support 11 and the closing resistance contact fixing portion 22 as in the second embodiment. As a result, the closing resistor 27 is electrically connected to the fixed support 11 and the closing resistor contact fixing portion 22, which facilitates the alignment work during assembly. In particular, in the present embodiment, the structure of the electrical connecting portion 103 can be extremely simplified. Also, the contact load of the energizing contact part is
It can be easily adjusted by appropriately setting the thickness and the amount of deflection of the metal rod 123. Further, similarly to the second embodiment, since the metal rod 123 is interposed between the breaking portion 2 and the closing resistor 27 as an elastic body, it is possible to effectively prevent the vibration during operation from being directly transmitted to the closing resistor 27. it can. In addition, in this embodiment, since the insulating cylinder 121 is used to form the closing resistor 27, sufficient mechanical strength can be obtained even when a large number of resistance elements 122 are stacked.

Further, a fourth embodiment shown in FIGS. 6 to 8 will be described. In the embodiment shown in FIGS. 6 to 8,
The basic structure is the same as in the first to third embodiments.
However, in this embodiment, the configurations of the closing resistor 27 and the electrical connection portion 103 are different from those of the first to third embodiments. That is, as shown in FIG. 6 and FIG. 7, the two closing resistors 27 a and 27 b, which are divided into two and arranged, are arranged between the shields 111 and 112 at both ends, respectively.
22 are laminated, the resistance element 122 is pressed by the spring 115, and the shields 111,
It is configured by disposing three insulating rods 114 around the resistance element 122 between 112.
The two closing resistors 27a and 27b are arranged side by side and electrically connected in series via the supporting insulating tube shield 101, as in the first and third embodiments.
Are configured.

Then, in this embodiment, the closing resistor 27 is used.
a, 27b, fixed support 11 and closing resistance contact fixing portion 22
As shown in FIG. 8, in the electrical connection portion 103 provided between the spring 116 and the plate 116, a spring tube 124 is arranged on one side of the plate 116, and a movable contactor 125 is slidably arranged therein. A spring load is constantly applied to the contactor 125 by the spring 118, and the plate 116 and the movable contactor 125 are also applied.
And a conductor 126 is connected between the two. The conductor 126 is provided for conducting a resistance current when the closing resistance contact is energized, and a knitted conductor having flexibility is used. This electrical connection 10
3 is fixed to the closing resistor 27 by a fixing means such as a bolt, but conversely, the electric connection portion 103 is fixed to the support 1.
1 and the closing resistance contact fixing portion 22 may be fixed.

In the present embodiment having the above-mentioned structure, the movable contact 125 of the electric connection portion 103 is brought into contact with the fixed support 11 and the closing resistance contact fixing portion 22, so that the closing resistance 27 and the fixed support 11 are connected. Also, the closing resistance contact fixing portion 22 is electrically connected, which facilitates the alignment work during assembly. Further, the contact load of the energizing contact portion can be easily adjusted by appropriately setting the spring coefficient of the spring 118 and the amount of deflection during use. Further, since the spring 118 is interposed between the breaking unit 2 and the closing resistance 27, it is possible to effectively prevent the vibration during operation from being directly transmitted to the closing resistance 27. In addition, in this embodiment, the resistance element 12
Since the insulating rod 114 is arranged around 2, the outer peripheral surface of the resistance element 122 is entirely in the gas, which is effective for promptly releasing the heat generated when the resistance is turned on.
It is possible to improve the withstand capability of the circuit breaker and also improve the mechanical strength.

Finally, a fifth embodiment shown in FIGS. 9 and 10 will be described. In the embodiment shown in FIGS. 9 and 10, the basic structure is the same as that of the first to fourth embodiments. However, in this embodiment, the configuration of the closing resistor 27 is different from that of the first to fourth embodiments. That is,
As shown in FIG. 9 and FIG. 10, the closing resistor 27 is divided into four and is composed of first to fourth closing resistors 27a to 27d. That is, the first shield 131a and the second shield 131a
The first closing resistance 27a is formed between the shields 131b of the second shield 131b and the third shield 131b.
The second closing resistor 27b is formed between c, the third closing resistor 27c is formed between the third shield 131c and the fourth shield 131d, and the third closing resistor 27c is formed between the fourth shield 131d and the fifth shield 131e. A fourth closing resistor 27d is formed between them. With this configuration, the closing resistors 27a to 27d are electrically connected in series to form the closing resistor 27. Also, the fourth shield 131d
An insulating member 132 that withstands a potential difference generated at closing and mechanically supports the closing resistor 27 is provided between the closing resistor supporting insulating cylinder 102 and the closing resistor supporting insulating cylinder 102. In this embodiment having such a configuration, the closing resistance 27 is set to 4
Since it is divided, the length of the closing resistor 27 can be further shortened,
It can further contribute to downsizing of the circuit breaker as a whole.

The present invention is not limited to the above-described embodiments, and for example, the structure of the closing resistor in any one of the embodiments and the structure of the electrical connection portion in the other embodiments are appropriately combined. It is also possible. Further, the insulating support means for insulating and supporting the closing resistance is not limited to the support insulating cylinder, and it is also possible to use an insulating means having another shape such as an insulating rod. That is, in the present invention, the specific structures of the closing resistance, its insulating support means, and the electrical connection means can be appropriately changed.

[0037]

As described above, in the present invention, the insulating support means for insulating and supporting the closing resistance in the container separately from the arc extinguishing chamber, the fixing portion of the arc extinguishing chamber and the fixing of the closing resistance contact portion. By providing an electrical connection means that detachably connects the closing resistance to the parts, it has high electrical and mechanical reliability, can contribute to downsizing of the circuit breaker as a whole, and is easy to assemble and maintain. It is possible to provide a good and excellent puffer type gas circuit breaker with a closing resistance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a typical embodiment (first embodiment) of a puffer type gas circuit breaker with a closing resistance according to the present invention.

FIG. 2 is a sectional view showing a structure around a closing resistance in a second embodiment of a puffer type gas circuit breaker with a closing resistance according to the present invention.

FIG. 3 is a cross-sectional view showing the structure of an electrical connection portion in the embodiment of FIG.

FIG. 4 is a sectional view showing a structure around a closing resistance in a third embodiment of a puffer type gas circuit breaker with a closing resistance according to the present invention.

5 is a cross-sectional view showing the structure of an electrical connection portion in the embodiment of FIG.

FIG. 6 is a cross-sectional view showing a structure around a closing resistance in a fourth embodiment of a puffer type gas circuit breaker with a closing resistance according to the present invention.

7 is a cross-sectional view taken along arrow A in FIG.

FIG. 8 is a cross-sectional view showing the structure of an electrical connection portion in the embodiment of FIG.

FIG. 9 is a sectional view showing a structure around a closing resistance in a fifth embodiment of a puffer type gas circuit breaker with a closing resistance according to the present invention.

10 is a perspective view showing a closing resistor and its shield in the embodiment of FIG.

FIG. 11 is a cross-sectional view showing an example of a conventional puffer-type gas circuit breaker with a closing resistance that is cut into two points.

FIG. 12 is a cross-sectional view showing an example of a conventional puffer-type gas circuit breaker with a closing resistor for one-point cutting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Breaking part 4 ... Arc extinguishing chamber 5 ... Making resistance contact part 6 ... Fixed part 7 ... Movable part 9 ... Fixed arc electrode 11 ... Fixed support 13 ... Movable arc electrode 15 ... Operation rod 16 ... Puffer cylinder 17 ... Support insulating cylinder 19 ... Movable support 20 ... Puffer piston 21 ... Insulating rod 22 ... Make-up resistance contact fixed part 23 ... Make-up resistance contact movable electrode 24 ... Insulating member 27, 27a to 27d ... Make-up resistance 28 ... Conductor 29 ... Insulation operation rod 30 ... mechanism box 101 ... support insulating cylinder shield 102 ... closing resistance support insulating cylinder (insulating supporting means) 103 ... electrical connecting portion (electrical connecting means) 104 ... male contact 105 ... female contact 106 ... current collecting portion 111, 112, 131a to 131d ... Shield 113, 122 ... Resistance element 114 ... Insulating rod 115, 118 ... Spring 116, 117 ... Plate 119 ... Spring pressed 120 ... metal foil 121 ... insulation tube 123 ... metal rod 124 ... spring tube 125 ... movable contactor 126 ... conductor 132 ... insulating member

Claims (1)

[Claims] 1. An arc-extinguishing chamber, which is housed in a container in which an insulating gas is sealed and is insulated and supported with respect to the container, and is electrically connected in parallel with this arc-extinguishing chamber to suppress an overvoltage at the time of application. A puffer-type gas circuit breaker with a closing resistance having a closing resistance and a closing resistance contact portion electrically connected in series with the closing resistance, wherein the closing resistance is insulated from the arc extinguishing chamber with respect to the container. An insulating support means for supporting, and an electric connection means for detachably connecting the closing resistance between the fixing portion of the arc extinguishing chamber and the fixing portion of the closing resistance contact portion are provided. Puffer type gas circuit breaker.