JPH0750121A - Tank type gas-blast circuit-breaker with resistor - Google Patents

Abstract

PURPOSE:To reduce the size of a circuit-breaker main tank and an operator by storing a main circuit-breaker and a resistor contact point in the circuit- breaker main body while storing a resistor body in a tank for the resistor, and by mounting the tank for the resistor on the circuit-breaker main tank. CONSTITUTION:A main circuit-breaker part 2 consisting of a fixed contact point 32 and a moving contact point 33, and a resistor contact point 3 consisting of a fixed side resistor contact point 34 and a moving side resistor contact point 35, are stored in a circuit breaker main tank 1, in which an insulating gas is sealed. An operator 5 is arranged below the tank 1, and the contact points 33 and 35 are driven by the operator through a link 36 connected to an insulating rod 6 and the contact point 35. The fixed as well as the mobile sides of the circuit breaker part 2 and the contact point 3 are connected together by an interpole insulating support rod 37, and the moving side is mounted on the tank 1 with an insulating support board 38. A tank 39 for resistor body is mounted on the branch pipe 40 of the tank 1, while a resistor body 4 is stored in the tank 39 and is supported by embedded conductors 42, 43 of an insulating spacer 41 provided on the connected part between the tank 1 and the tank 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank-type gas circuit breaker with a resistance provided with a resistance contact portion for suppressing overvoltage during switching.

[0002]

2. Description of the Related Art FIG. 10 and FIG.
It is sectional drawing which shows the conventional tank type gas circuit breaker with a resistance shown by 279017. In FIG. 10, reference numeral 1 is a circuit breaker main tank in which an insulating gas is sealed, and a main circuit breaker 2, a resistance contact 3, and a resistor 4 are housed inside. The operating device 5 is arranged below the main tank 1 of the circuit breaker, and drives the main breaking unit 2 and the movable contact of the resistance contact 3 via the insulating rod 6. Reference numeral 7 is a conductor that electrically forms a circuit with the outside of the circuit breaker, and another transformer device (not shown) through the branch pipe 8.
Connected to.

FIG. 11 shows another conventional example. In the figure, reference numeral 9 is a first tank which houses the main shutoff portion 2 and which is filled with an insulating gas. The main shutoff portion 2 is supported by an insulating support 10 from one end of the first tank 9 and It is driven in the horizontal direction by the operating device 5 arranged at. Reference numeral 11 denotes a second tank containing the resistance contact 3 and the resistor 4, which is arranged under the first tank 9 and has openings 1 and 2 at the first tank 9 and two places.
Insulating gas is communicated via 13. The resistance contact 3 and the resistor 4 are supported by the insulating supports 14 and 15 from both ends of the second tank 11. Also, conductors 16 and 1
7 is inserted into contact seats 18, 19, 20, and 21, respectively, in which springs and finger-shaped contacts are provided, and the main cutoff portion 2
And the movable contact side of the resistance contact 3 and the main breaker 2 and the resistance contact 3
The fixed contact sides of are electrically connected to each other.

Reference numeral 22 in the drawing denotes a third tank, which accommodates a connecting portion 24 for mechanically connecting the operation lot 23 provided on the movable contact side of the main shutoff portion 2 and communicates with the first tank 9. ing. Further, the fourth tank 25 communicates with the second tank 11, and further the third tank 25 is connected through the tubular tank 26 to the third tank 25.
It also communicates with the tank 22 of. The communication part 24 is provided so that the drive shaft of the operation piston 27 of the operation device 5 and the movable shaft of the main cutoff part 2 are substantially aligned with each other.
The operating force of the operating device 5 is transmitted to the operating rod 31 on the side of the resistance contact 3 via the rod 8, the rod 29, and the lever 30 on the side of the resistance contact. It is adapted to be driven.

[0005]

A conventional tank-type gas circuit breaker with a resistance is configured as described above. The resistance of the tank-type gas circuit breaker with resistance is mainly used for the purpose of reducing the re-surging surge that occurs when a high-speed reclosing of an unloaded transmission line is performed. In general, the smaller the value of the closing resistance, the larger the overvoltage at the time of inserting the closing resistance, and conversely, the larger the resistance value, the larger the overvoltage at the time of closing the main circuit.
Therefore, the resistance value has an optimum value. In the study of the optimum value in a general 500 kV system in Japan, it is said that a resistance value of 500 to 1200Ω has almost the same suppression effect, and it has a duty of high-speed reclosing of a 550 kV-rated no-load transmission line. A value of about 1000Ω is often used for a line gas circuit breaker.

However, the volume occupied by the resistor of 1000 Ω is very large, and in a normal circuit breaker, for example, the resistor 4 is arranged around the main breaking portion 2 as shown in FIG. It was arranged in the longitudinal direction of the main tank 1. Therefore, there is a problem that the tank diameter (φD) of the circuit breaker becomes large and the tank length (L) becomes long, so that the circuit breaker main tank 1 becomes large.

Further, in the substation, the tank type gas circuit breaker with resistance is required only for the circuit breaker and the circuit breaker for the busbar or the transformer circuit breaker does not need the resistor, so Two types of circuit breakers, a tank type gas circuit breaker with a built-in type and a tank type gas circuit breaker without resistance, are required, and there is waste in the manufacturing process of the circuit breaker, such as having two types of main circuit breaker main tanks 1 which are main components.

For the purpose of downsizing and eliminating the type of the circuit breaker main tank 1, the resistance contact 3 and the resistor 4 as shown in FIG. 11, for example, are housed in the second tank 11, and this tank is used. There has been proposed a circuit breaker having a structure that enables easy attachment / detachment. Then, a circuit breaker that does not require the resistance contact 3 and the resistor 4 is handled by a circuit breaker with the second tank removed, so that the first tank 9 is made into one type and the waste of the manufacturing process is eliminated, and the main circuit is shut off. At the same time, the tank that houses the part 2 has been made uniform.

However, this type of tank breaker with a resistance requires the third tank 22 and the fourth tank 25 in addition to the second tank 11, and the resistance contact 3 has the second tank 11. Since it is housed in, the rod 29 and levers 28, 30 for driving the resistance contact 3 are required,
The structure is very complicated. Further, since the resistance contact 3 has to be assigned to a position distant from the operation shaft of the operation device 5, the rods and levers are inevitably heavy, and the operation device 5 for driving this also requires a large operation force. As a result, there is a problem that the operating device 5 becomes large.

The present invention has been made in order to solve the above problems. The main circuit breaker tank 1 is downsized, the type of main circuit breaker tank 1 is eliminated, and the resistance contact 3 is provided. It is an object of the present invention to provide a tank-type circuit breaker with a resistance, in which rods and levers for driving an actuator are made simple and lightweight to prevent the operating device 5 from becoming large.

[0011]

In a tank type gas circuit breaker with a resistor according to the present invention, a main circuit breaker and a resistance contact are housed and arranged in a circuit breaker main tank, and a resistor is provided branching from the circuit breaker main tank. It is housed in a resistor tank attached to a branch pipe, and these are electrically connected by a first conductor and a second conductor.

Also, an insulating spacer is provided at the connecting portion between the main circuit breaker tank and the resistor tank.

The resistor is supported by an insulating spacer or an insulating support provided in the resistor tank.

When the circuit breaker main tank is arranged horizontally, the resistor tank is attached vertically downward to the circuit breaker main tank, and one end of the circuit breaker main tank is supported by the resistor tank. I did it.

[0015]

In the tank type gas circuit breaker with resistance according to the present invention, since the resistance contact is housed in the same tank as the main circuit breaker,
The resistance contact can be arranged close to the operating device for driving the main breaker. Therefore, the structure of rods and levers for driving the resistance contact can be simplified.

Further, since only the resistor having a large volume is housed in the dedicated resistor tank, the breaker main tank may be large enough to house the main breaking portion and the resistance contact portion.

Further, since the insulating spacer is provided at the connecting portion between the main circuit breaker tank and the resistor tank, the high temperature hot gas generated in the main circuit breaking portion when the current is cut off does not directly act on the resistor. If the insulating spacer is also used as a support member for the resistor, the resistor can be easily supported.

When the circuit breaker main tank is arranged horizontally, the resistor tank is mounted vertically downward, and one end of the circuit breaker main tank is supported by this resistor tank to form a part of the gantry. can do.

[0019]

【Example】

Example 1. An embodiment of the present invention will be described below. Figure 1
Shows a structure of a vertical type GIS tank type gas circuit breaker with a resistor. In the figure, 1 is a circuit breaker main tank in which an insulating gas is enclosed, and a main conductor 2 composed of a fixed contact 32 and a movable point 33 and a fixed conductor 51 are provided by an insulation stand 50.
Fixed-side resistance contact 34 and movable-side resistance contact 3 supported from
A resistance contact 3 composed of 5 is housed. In addition, the operating device 5
Is arranged below the main circuit breaker tank 1 and configured to drive the movable contact 33 and the movable resistance contact 35 of the main breaker 2 via a link 36 connected to the insulating rod 6 and the movable resistance contact 35. There is. The fixed side and the movable side of the main breaking portion 2 and the resistance contact 3 are connected by an inter-electrode insulating support rod 37, and the movable side is attached to the breaker main tank 1 by an insulating support base 38. Reference numeral 7 is a conductor that electrically forms a circuit with the outside of the circuit breaker, and is connected to another substation device (not shown) via a branch pipe 8. Resistor tank 39
Is attached to the branch branch pipe 40 of the main circuit breaker tank 1,
The resistor 4 is housed in the resistor tank 39 and is supported by the buried conductors 42 and 43 of the insulating spacer 41 provided at the connecting portion between the circuit breaker main tank 1 and the resistor tank 39. Has become.

In the example of this figure, the resistor tank 39 has a longitudinal axis of the resistor tank 39 on the fixed contact 32 side of the main breaking portion 2 with respect to a longitudinal axis of the circuit breaker main tank 1. It is arranged at a right angle and on the opposite side of the branch pipe 8. The first conductor 44 and the second conductor 45 are respectively inserted into the contact seats 18 and 19 in which springs and finger-shaped contacts are provided, and the buried conductors 42 and 43 of the insulating spacer 41 of the branch branch pipe 40 are inserted. The fixed contact 32 side of the main breaker 2 and the fixed resistance contact 34 of the resistance contact 3 are electrically connected via the.

As described above, in the gas circuit breaker of the present invention, since the resistor 4 having a large volume is housed in the dedicated resistor tank 39, and the branch branch pipe 40 of the circuit breaker main tank 1 can be attached and detached, The same main circuit breaker tank 1 can be used for a circuit breaker without resistance, and the type of main circuit breaker tank 1 can be eliminated.

Since the main breaker 2 and the resistance contact 3 are housed in the breaker main tank 1, the movable contact 3 of the main breaker 2 is included.
Since the movable contact point 35 and the movable contact point 35 can be arranged close to each other, the link 36 required for driving the movable contact point 35 can be simple, small and lightweight, and the operating device 5 can be prevented from becoming large.

Further, since the insulating spacer 41 is inserted in the contact portion between the circuit breaker main tank 1 and the resistor tank 39, the main breaker 2 is mainly discharged from the fixed side when the short circuit current is cut off. Since the high-temperature hot gas does not directly act on the resistor 4 and the resistor 4 is protected and it is not necessary to design the insulation margin in consideration of the hot gas, the resistor tank 39 can be made small. It becomes possible to design. Further, by also using this insulating spacer 41 as a member for supporting the resistor 4, it also has an effect that the support structure of the resistor 4 can be simplified.

In addition, the insulating spacer 41 can also have a function of dividing the gas between the circuit breaker main tank 1 and the resistor tank 39, and when this function is provided,
For example, by increasing the gas pressure in the resistor tank 39 and further improving the gas insulation performance, the insulation distance between the resistor 4 and the resistor tank 39 can be reduced, and the resistor tank is further improved. It becomes possible to downsize 39.

Further, since the resistor tank 39 is arranged such that the axis of the resistor tank 39 is at a right angle to the axis of the circuit breaker main tank 1, the height limit is particularly limited when the resistor tank 39 is transported to the site. The vertical type GIS tank type gas circuit breaker has a merit that the total height of the circuit breaker can be kept low.

Although FIG. 1 shows an example of application to a vertical GIS tank gas circuit breaker in which the conductor 8 is drawn out in the same direction, the conductor 8 is fixed contact 32 and movable contact 33 of the main breaker 2.
Vertical GIS that is pulled out in opposite directions on the sides
It goes without saying that the tank-type gas circuit breaker has the same effect.

Example 2. 2A and 2B show one example of a structure in which the resistor 4 is supported by the spacer 40 for insulation, and FIG. 2B is a front sectional view and FIG. 2A is a sectional view taken along line AA of FIG. . In this embodiment, in order to support the resistor 4, the buried conductors 42 and 43 of the insulative spacer 41 to which the first conductor 44 and the second conductor 45 are connected are used, and a new insulating spacer is used. A support metal fitting 46 for supporting the resistor 4 is cast integrally with the insulating spacer 41, and this also has a structure for supporting the resistor 4 connected by the connection conductor 47. This support fitting 46 may or may not penetrate the insulating spacer 41. In the example of this figure, the support fitting 46 is the insulating spacer 41.
And the side of the circuit breaker main tank 1 of the support metal fitting 46 has a shape that also serves as a shield in order to alleviate the electric field.

The weight of the resistor 4 of about 1000Ω is relatively heavy, about several hundreds of kg. Therefore, by using the method for supporting the resistor 4 of the present invention, the reliability of mechanical strength can be further improved. .

Example 3. FIG. 3 shows an embodiment of a tank type gas circuit breaker for horizontal GIS with a resistor. Horizontal G
In the IS tank type circuit breaker, the conductor 7 on the fixed side may be pulled out in the axial direction of the circuit breaker main tank 1 as shown in this figure, but the resistor tank 39 containing the resistor 4 is used.
Is placed above the fixed contact 32 of the main breaking unit 2,
Since the tank type gas circuit breaker with resistance can be configured without lengthening the longitudinal direction of the main circuit breaker tank 1,
The installation area of the IS as a whole can be reduced.

Example 4. FIG. 4 is one of the embodiments of the tank type gas circuit breaker for the horizontal type GIS, and the conductor 7 on the fixed side is shown in FIG.
Is pulled out to the upper part, (a) shows a side view, and (b) shows a front sectional view. In this case, by arranging the resistor tank 39 between the pedestals 48 supporting the circuit breaker main tank 1, the same effect as that of the third embodiment can be obtained.

Example 5. Further, FIG. 5 shows a structure in which the resistor tank 39 of the fourth embodiment is configured to replace the pedestal 48 of the main circuit breaker tank 1, (a) is a side view, and (b) is a front sectional view. By using the resistor tank 39 also as the gantry, the gantry 48 of the circuit breaker main tank 1 can be omitted, and the circuit breaker main tank can be manufactured at low cost.

Example 6. FIGS. 6A and 6B show an embodiment of a tank type gas circuit breaker for horizontal single unit with resistance, wherein FIG. 6A is a side sectional view and FIG. 6B is a front sectional view. Unlike the GIS tank gas circuit breaker, a bushing 52 is attached to the branch pipe 8 and electrically connected to the outside of the circuit breaker by the conductor 7. In the tank type gas circuit breaker for a single unit, since the air intermediate distance of the bushing is required, the interphase distance of the circuit breaker inevitably becomes large. As shown in this embodiment, the resistor tank 39 containing the resistor 4 is provided. It is possible to arrange the circuit breaker horizontally with respect to the main tank 1. By carrying out such an arrangement configuration, it is possible to prevent the decomposition products generated at the time of arc interruption from splashing on the insulating spacer 41, so that it is possible to improve the insulation reliability as compared with the fourth and fifth embodiments. it can.

Example 7. FIG. 7 shows a method of attaching the resistor 4 to the resistor tank 39, and shows partial details of the resistor tank 39 portion. Examples 1-5
The method of supporting the resistor 4 shown in FIG. 4 is to support it from the circuit breaker main tank 1 and the insulating spacer 41 inserted in the connecting portion of the resistor tank 39, but as shown in this figure, the resistor 4 is used for the resistor. It is also possible to support it from the end surface of the tank 39 using an insulating support rod 49. Since the insulating support rod 49 can be manufactured at a lower cost than the insulating spacer 41,
By adopting this structure, it is possible to provide a cheaper tank breaker with a resistor.

Example 8. FIG. 8A is a vertical GIS tank circuit breaker with a resistor in which the longitudinal axes of the circuit breaker main tank 1 and the resistor tank 39 form a right angle, and the resistor tank 39 is connected to the axis A of the branch pipe 8. FIG. 4B is a plan view showing the case where the axis line B of the resistance tank 39 is inclined by θ, and FIG. Resistance tank 3
By arranging 9 in this way, the L1 dimension in the figure can be shortened. For example, GIS applied to an underground substation,
This is effective as a structure of a gas circuit breaker in which the wall surface of the building is restricted in the L1 direction.

Example 9. 9 (a) to 9 (d) show a branch pipe 8 and a resistance tank 3 which form the main circuit of the circuit breaker main tank 1.
It is the front view which showed the variation of the arrangement structure of the tank type gas circuit breaker for vertical GIS with a resistance in the place which constituted the branch branch pipe 40 which attaches 9 with the same dimension. In this embodiment, since the branch pipes 8 of the same size are provided at four places in the circuit breaker main tank 1, as shown in this figure, one type of circuit breaker main tank 1 has four types of vertical GIS gas circuit breakers. It becomes possible to further dispose the type of the main circuit breaker tank 1.

The structure and effect of the present invention have been described above by taking a single-point tank type circuit breaker having one main cutoff portion 2 as an example. However, the present invention has two main cutoff portions 2. It goes without saying that the same effect can be obtained even when applied to a cut tank type gas circuit breaker.

[0037]

According to the present invention, in the tank type gas circuit breaker with resistance, the main breaker 2 and the resistance contact 3 are housed in the breaker main tank 1, and the resistor 4 occupying a large volume is used as a dedicated resistor. Since the body tank 39 is housed and attached to the circuit breaker main tank 1, the circuit breaker main tank 1 and the operating device 5 can be downsized, and the types of the circuit breaker main tank 1 can be reduced.

Since the insulating spacer 41 is provided at the connecting portion between the circuit breaker main tank 1 and the resistor tank 39, it is possible to prevent the hot gas from directly acting on the resistor 4,
The resistance tank 39 can be miniaturized.

Since the resistor 4 is supported by the insulating spacer 41, the mounting structure of the resistor 4 can be simplified. Further, since the support fitting 46 is integrally cast on the insulating spacer 41 and the resistor 4 is supported by using this, the reliability in mechanical strength is improved.

Further, since the gas filled in the circuit breaker main tank 1 and the resistor tank 39 is divided by the insulating spacer 41, the gas pressure in the resistor tank 41 can be increased, and the resistor tank 39 can be increased. Can be miniaturized.

Moreover, since the resistor 4 is supported by the insulating support rod 49 from the resistor tank 39, a more inexpensive breaker can be provided.

Further, since the resistor tank 39 is also used as the frame for supporting the circuit breaker main tank 1, the circuit breaker main tank can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a vertical GIS with a resistor according to an embodiment of the present invention.
It is sectional drawing of the tank type gas circuit breaker.

FIG. 2 is a partial detailed view showing a method of supporting a resistor according to the present invention.

FIG. 3 is a horizontal GI with a resistor showing another embodiment of the present invention.
It is sectional drawing of the tank type gas circuit breaker for S.

FIG. 4 is a horizontal GI with a resistor showing another embodiment of the present invention.
It is sectional drawing of the tank type gas circuit breaker for S.

FIG. 5 is a horizontal GI with a resistor showing another embodiment of the present invention.
It is sectional drawing of the tank type gas circuit breaker for S.

FIG. 6 is a cross-sectional view of a tank type gas circuit breaker for horizontal single use with a resistor showing another embodiment of the present invention.

FIG. 7 is a partial detailed view showing a method of supporting a resistor according to the present invention.

FIG. 8 is a vertical GI with a resistor according to another embodiment of the present invention.
It is the top view and front view of the tank type gas circuit breaker for S.

FIG. 9 is a vertical GI with a resistor according to another embodiment of the present invention.
It is a front view of the tank type gas circuit breaker for S.

FIG. 10 is a sectional view showing a conventional tank-type gas circuit breaker with resistance.

FIG. 11 is a sectional view showing another embodiment of a conventional tank-type gas circuit breaker with a resistor.

[Explanation of symbols]

 1 Circuit Breaker Main Tank 2 Main Circuit Breaker 3 Resistance Contact 4 Resistor 32 Fixed Contact 33 Movable Contact 34 Fixed Side Resistance Contact 35 Movable Side Resistance Contact 39 Resistor Tank 40 Branch Branch 41 Insulation Spacer 44 First Conductor 45 No. 2 conductor 49 Insulated support rod

Claims (6)

[Claims] 1. A main contact breaker composed of a fixed contact and a movable contact is electrically connected in parallel, and a resistance contact composed of a fixed-side resistance contact and a movable-side resistance contact for suppressing a switching surge and the resistance contact are electrically connected to each other. In the case of providing a resistor connected in series, in the main tank of the circuit breaker, the main breaker and the resistance contact,
The resistor is housed and arranged in a resistor tank attached to a branch pipe provided separately from the breaker main tank, and a first conductor for connecting the resistance contact and the resistor and the resistor and the main breaker are provided. A tank type gas circuit breaker with a resistance, characterized in that a second conductor to be connected is arranged. 2. An insulating spacer is provided at a connecting portion between the circuit breaker main tank and the resistor tank, and the first conductor and the second conductor are configured to penetrate the insulating spacer. Item 1. A tank-type gas circuit breaker with resistance according to item 1. 3. The tank type gas circuit breaker with resistance according to claim 1, wherein the resistor is supported by an insulating spacer. 4. The tank type gas circuit breaker with resistance according to claim 1, wherein the resistor is supported by the insulating tank from the resistor tank. 5. A circuit breaker main tank is arranged so that its axis line is horizontal, and a resistor tank is attached to a branch pipe provided vertically below the circuit breaker main tank, and the circuit breaks by the resistor tank. The tank-type gas circuit breaker with a resistance according to claim 1, wherein one end of the main tank is supported. 6. The tank type with resistance according to claim 1, wherein axes of the breaker main tank and the resistor tank are substantially perpendicular to each other in the tank longitudinal direction. Gas circuit breaker.