JP2868794B2 - Puffer type gas circuit breaker - Google Patents

Description

The present invention relates to a puffer type gas circuit breaker having a closing resistance contact and a closing resistance.

(Prior Art) In recent years, as the capacity of power transmission systems has increased, the breaking capacity of circuit breakers used in substations and switchyards has increased, and high reliability has been required. In order to increase the reliability of such a circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of breaking points of the circuit breaker is reduced. For example, in the case of a development 550KV system,
Although the point-break circuit breaker has been put into practical use, it is required to further cut it into one point.

By the way, when such a large capacity circuit breaker is cut into one point, in order to improve the arc extinguishing performance, it is necessary to make the opening speed of the breaker much faster than that of the conventional two-point breaker. is there. Therefore, in contrast to the conventional circuit breaker, which has a fixed electrode and a movable electrode opposed to the fixed electrode and moves only the movable electrode at the time of opening, two opposed electrodes are simultaneously moved in opposite directions to open. A circuit breaker called a so-called double motion has been proposed. According to this double-motion circuit breaker, the opening speed is much faster and the arc-extinguishing performance is greatly improved, although the moving speed of each electrode is the same as that of the conventional circuit breaker. is there.

An example of such a double-motion circuit breaker is shown in FIG.
This is shown in FIG. 9 and FIG. In the figure, 1 is a first movable electrode, and 10 is a second movable electrode (corresponding to a conventional fixed electrode). The first movable electrode 1 is provided at the tip of a puffer cylinder 2, and an insulating nozzle 3 and a movable energizing contact 4 are concentrically arranged on the outer periphery thereof. An operation rod 5 is fixed to the center of the puffer cylinder 2, and the operation rod 5 is connected to an operation mechanism (not shown) via an insulating rod 6. Further, inside the puffer cylinder 2, a puffer piston 8 supported and fixed to the insulating cylinder 7 is provided.
The space surrounded by the puffer piston 8 and the puffer cylinder 2 is a puffer chamber 9.

On the other hand, the second movable electrode 10 is provided so as to protrude at the center of the surface of the energized cylinder 11 facing the first movable electrode 1, and is configured to be inserted into the insulating nozzle 3 and the first movable electrode 1. . On the outer periphery of the second movable electrode 10, a second movable electrode contact 12 and a second movable shield 13 that are in contact with the movable energizing contact 4 of the first movable electrode are provided. The current-carrying cylinder 11 supporting the second movable electrode 10 is slidably inserted into the current-carrying conductor 14 at the base thereof and, at the same time, an insulating rod disposed outside the first movable electrode 1.
It is connected to the base of the operation rod 5 that drives the first movable electrode 1 via a link 15 and a link mechanism 16. The link mechanism 16 includes first and second connecting rods 16b and 16c rotatably connected to both ends of a link 16a, and a link support 16d for supporting the link 16a. Link 16a is
The fulcrum 16e of the link support 16d set to a predetermined link ratio
It is rotatably supported on the link support 16d around the axis. The first and second connecting rods 16b and 16c are
One end of each is rotatably connected to the operating rod 5 and the insulating rod 15. The link support 16d is fixed to an insulating cylinder 7 that is insulated and fixed to a container (not shown).

When the operating mechanism (not shown) is driven in the closed state shown in FIG. 8, the operating rod 5 moves to the operating mechanism side (the right side in the figure) at a predetermined speed in the double motion type circuit breaker thus configured. Then, the first movable electrode 1 fixed to the distal end moves rightward, and a breaking operation is performed with the second movable electrode 10. On the other hand, with the operation of the operation rod 5, the link mechanism 16 connected thereto is driven to move the insulating rod 15 to the side opposite to the operation rod 5 (left side in the figure). As a result, the current-carrying cylinder 11 and the second movable electrode 10 fixed to the tip of the insulating rod 15 move in the direction opposite to the first movable electrode 1 (left side in the figure). Also, the movement of the operation rod 5 causes the puffer cylinder 2 fixed to the tip thereof to move with respect to the puffer piston 8 fixed to the insulating cylinder 7, and the puffer chamber 9 is compressed. Is guided by the insulating nozzle 3 and sprayed between the first and second electrodes that are separated from each other, so that an arc extinguishing operation is performed.

Note that the closing operation is performed by driving the operation rod 5 in the direction opposite to the blocking operation to relatively approach the first and second movable electrodes 1 and 10.

In this way, in a double-motion circuit breaker,
While the moving speed of the operating rod 5 is the same as that of the conventional circuit breaker, since both the first and second movable electrodes 1 and 10 are driven in opposite directions, the relative opening speed between the two electrodes is reduced. It is about twice as large, and even a large capacity circuit breaker can be cut by one point.

(Problems to be Solved by the Invention) Incidentally, in a circuit breaker for a line in a large-capacity system such as a 550 KV class, a closing resistance method is adopted in order to suppress a closing overvoltage at closing. In this method, a closing resistance contact having a closing resistance is provided in parallel with the main contact of the circuit breaker. Is input. In this method, at the time of opening, it is necessary that the closing resistance contact is first opened and then the main contact is opened.

When this closing resistance type is adopted for the double-motion type circuit breaker, reduction of the switching overvoltage and downsizing of the circuit breaker and the gas-insulated switchgear using the same become serious problems, and it is important to solve this problem. Is an important task.

First, Fig. 10 shows a conventional 550KV class two-point breaker.
Insulation recovery characteristics of closing contact and main contact per point and 550KV
The insulation recovery characteristics of the closing contact and the main contact of the class 1-point breaker were shown. As is clear from the figure, in the 550KV class single-break circuit breaker, the opening speed of both the main contact and the closing resistance contact is faster than in the case of two single-breakers.

At the time of opening, the insulation recovery speed of the closing resistance contact is faster than the insulation recovery speed of the main contact.

At closing, the closing resistance contact is closed before the main contact.

It is necessary to satisfy the condition.

However, in a conventional circuit breaker in which only one electrode is movable, the opening or closing timing of both the main contact and the closing resistance contact is different in electrode shape (the main contact has an electrode structure using a wipe. On the other hand, the closing resistance contact employs a butt contact using a spring).

However, in a double motion type circuit breaker, which is adopted as a 550KV class single-point breaker, both electrodes move to the opposite side at the same time at the main contact. When the closing resistance contact is moved at the same speed, the closing speed or opening speed of the closing resistance contact becomes about 1/2 of the main contact, and as described above, the closing speed or opening of the closing resistance contact. The problem arises that the speed cannot be made faster than the main contact. In addition, a puffer-type gas circuit breaker that blows an arc-extinguishing gas between the electrodes of the main contact when the electrode is opened is adopted as a large-capacity circuit breaker of this type, whereas a breaker gas is particularly applied to a closing resistance contact. For this reason, it is difficult to make the insulation recovery speed of the closing resistance contact faster than that of the main contact because no gas is blown.

The present invention has been proposed in order to solve the above-mentioned drawbacks. The purpose of the present invention is to reduce the size of the device, to reduce the over-voltage at the time of closing, and to make the closing resistance contact at the time of opening or closing. An object of the present invention is to provide a highly reliable puffer-type gas circuit breaker capable of improving an insulation recovery speed.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, a puffer type gas circuit breaker according to the present invention according to claim 1 is provided in a container in which an arc-extinguishing gas is sealed. In a puffer type gas circuit breaker of a double motion type in which a main contact having a first movable electrode and a second movable electrode which can be freely contacted and separated facing each other is housed, 1 The first movable electrode for the closing resistance contact is installed cylindrically and coaxially, and the first movable electrode for the main contact is
A second movable electrode for the closing resistance contact is supported and fixed so as to operate integrally with the movable electrode, and a second movable electrode for the closing resistance contact is opposed to the first movable electrode for the closing resistance contact and a cylinder is formed around the second movable electrode for the main contact. The main contact second movable electrode is opened and closed in accordance with the operation of the main contact, the opening and closing operation of the closing resistance contact is performed prior to the opening and closing operation of the main contact. A closing resistor is provided on the back side of at least one of the first movable electrode for the resistance contact and the second movable electrode for the closing resistor, and the closing resistor is provided on the side on which the closing resistor is provided. It is characterized by being electrically connected to the electrode.

According to a second aspect of the present invention, in the puffer type gas circuit breaker according to the first aspect, the second movable electrode for the closing resistance contact is fixed to the second movable electrode for the main contact via an insulator. It is characterized in that it is slidably supported by being urged toward the first movable electrode by a spring in a cylindrical holder.

(Operation) According to the puffer type gas circuit breaker of the present invention, the relative opening / closing speed of the closing resistance contact can be made substantially the same as the relative switching speed of the main contact, and the closing resistance contact is provided outside the main contact. Since the electrodes are coaxially arranged, the shape of the electrode is larger than that of the main contact electrode, so that the insulation recovery speed can be faster than that of the main contact. Furthermore, by making the pair of closing resistance contacts facing each other coaxial and cylindrical with the main contact,
The configuration can be made more compact than the conventional type which is arranged in parallel with the main contact.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to FIGS. 1 to 7. The same members as those of the conventional type shown in FIGS. 8 and 9 are denoted by the same reference numerals, and description thereof will be omitted.

First Embodiment In this embodiment, as shown in FIGS. 1 and 2, the first movable electrode 21 for the closing resistance contact is installed coaxially around the first movable electrode 1 for the main contact. Are fixed to a support portion 22 provided on the operating rod 5 of the first movable electrode 1 for the main contact. Further, a second movable electrode 23 for closing resistance contact is provided coaxially around the second movable electrode 10 for main contact,
It is slidably supported in a cylindrical holder 26 fixed to the second movable electrode 10 for main contacts via 24. In addition,
This holder 26 has a locking portion 26a at its tip,
An energizing contact 26b that slides with the second movable electrode for a closing resistance contact is provided inside, and the second movable electrode 23 for the closing resistance contact is provided.
Is urged toward the first movable electrode side (right side in the figure) by a spring 27 and housed in the holder 26. Further, on the back side of the second movable electrode 23 for the closing resistance contact, a closing resistor 28 is disposed, and the second movable electrode 23 for the closing resistance contact is provided.
Are electrically connected to each other through an energizing cylinder 29.

FIG. 1 shows the closed state of the circuit breaker, and FIG. 2 shows the closed state.

In the puffer type gas circuit breaker of this embodiment having such a configuration, the electrode for the main contact and the electrode for the closing resistance contact are opened and closed as described below. That is, as shown in FIG. 3, the transition from the closing state to the closing state shown in FIG. 1 first involves the first movable electrode 21 for the closing resistance contact and the second movable electrode 23 for the closing resistance contact. Open (point A in the figure), then
The first movable electrode 1 for the main contact and the second movable electrode 10 for the main contact in the arc-extinguishing chamber are separated (point B in the figure). On the other hand, at the time of closing, first, the first movable electrode 21 for closing resistance contact and the second movable electrode 23 for closing resistance contact are closed (point C in the figure), and accordingly, the closing resistor 28 is kept for a certain time. When the first movable electrode 1 for the main contact and the second movable electrode 10 for the main contact in the arc-extinguishing chamber are turned on (point D in the drawing), a current flows through the closing resistor 28. Disappears.

As described above, according to the present embodiment, the closing resistance contact electrode can be operated before the main contact electrode is cut off or closed. Further, the insulation recovery speed of the closing resistance contact portion can be made faster than the insulation recovery speed of the main contact due to the difference between the wipe difference and the electrode shape. further,
The electrode for the closing resistance contact is arranged coaxially with the electrode for the main contact,
By arranging the closing resistor on the back side of the second movable electrode for the closing resistor contact, an extremely compact configuration can be achieved.

Second Embodiment In this embodiment, as shown in FIGS. 4 and 5, the closing resistor 30 is arranged on the back side of the first movable electrode 21 for the closing resistor contact. That is, the first movable electrode 21 for the closing resistance contact is coaxially arranged around the first movable electrode 1 for the main contact, and is fixed to the operation rod 5 of the first movable electrode 1 for the main contact via the insulator 31. Have been. Further, the first movable electrode 21 for the closing resistance contact is electrically connected to a closing resistor 30 disposed on the back side thereof through a current-carrying cylinder 32. On the other hand, the second movable electrode 23 for the closing resistance contact is slidably supported in a holder 26 fixed to the second movable electrode 10 for the main contact. The other configuration is the same as that of the first embodiment, and the description is omitted.

Also in the puffer type gas circuit breaker of this embodiment having such a configuration, the main contact electrode and the closing resistance contact electrode are opened and closed in the same manner as in the first embodiment, and the same effect can be obtained.

Third Embodiment In this embodiment, as shown in FIGS. 6 and 7, the closing resistors 28 and 30 are respectively placed on the back side of the second movable electrode 23 and the first movable electrode 21 for the closing resistor contact. They are arranged and electrically connected via current-carrying cylinders 29 and 32, respectively. The configuration of the other parts is the same as that of the first and second embodiments, and a description thereof will be omitted.

Also in the puffer type gas circuit breaker of this embodiment having such a configuration, the main contact electrode and the closing resistance contact electrode are opened and closed in the same manner as in the first and second embodiments, and the same effect is obtained. be able to. Further, since the closing resistors are provided on both sides of the closing resistor contact electrode, it is more effective when increasing the energy consumption of the closing resistor.

[Effects of the Invention] As described above, according to the present invention, the first and second movable electrodes for the closing resistance contact are provided coaxially around the first and second movable electrodes for the main contact, respectively. Also, the first movable electrode for the closing resistance contact is supported and fixed so as to operate integrally with the first movable electrode for the main contact, and the second movable electrode for the closing resistance contact is moved in accordance with the operation of the second movable electrode for the main contact. The opening and closing operation of the closing resistance contact is performed prior to the opening and closing operation of the main contact, and a closing resistor is provided on the back side of at least one of the two closing resistance contact electrodes. A highly reliable puffer type that reduces the size of equipment, reduces the overvoltage at closing, and improves the insulation recovery speed of the closing resistance contact at opening or closing. A gas circuit breaker can be provided.

In particular, the present invention relates to a cylindrical and coaxial second movable resistive contact second opposing first movable electrode.
Because of the configuration in which the movable electrode is provided, the resistive contacts surely come into contact with or separate from each other. As a result, it is easy and reliable to apply the closing resistance in advance when opening and closing the main contact, and it is possible to improve the insulation recovery characteristic between the two resistance contacts.

[Brief description of the drawings]

1 and 2 are sectional views showing a first embodiment of a puffer type gas circuit breaker according to the present invention. FIG. 1 shows a closed state of the circuit breaker, FIG. Is a diagram showing a time chart of the opening and closing operation of the puffer type gas circuit breaker of the present invention,
4 and 5 are sectional views showing a second embodiment of the present invention. FIG. 4 shows a closed state of the circuit breaker, FIG. 5 shows a closed state, and FIGS. FIG. 6 is a sectional view showing a third embodiment of the present invention, FIG. 6 shows a closed state of a circuit breaker, FIG. 7 shows a closed state, and FIGS. FIG. 8 is a cross-sectional view showing an example of a puffer type gas circuit breaker.
The figure shows a cut-off state, and FIG. 10 is a view showing insulation recovery characteristics of a main contact and a closing resistance contact. 1 1st movable electrode (for main contact), 2 ... Puffer cylinder, 3 ... Insulated nozzle, 4 ... Movable energizing contact, 5 ...
... Operation rod, 6 ... Insulated rod, 7 ... Insulated cylinder, 8 ...
... Puffer piston, 9 ... Puffer chamber, 10 ... (for main contact) 2nd movable electrode, 11 ... Cylindrical cylinder, 12 ... 2nd movable energizing contact, 13 ... Second movable shield, 14 ... Conducting conductor, 15: insulating rod, 16: link mechanism, 16a: link, 16b, 16c: connecting rod, 16d: link support, 16e
… Fulcrum, 21… first movable electrode for closing resistance contact, 22…
Supporting part, 23: second movable electrode for closing resistance contact, 24: insulator, 26: holder, 26a: locking part, 26b: energizing contact, 27: spring, 28: closing resistance Body, 29: energized cylinder, 30: closing resistor, 31: insulator, 32: energized cylinder

Claims (2)

(57) [Claims] 1. A double-motion type puffer-type gas circuit breaker in which a main contact having a first movable electrode and a second movable electrode which can be freely contacted and separated is stored in a container filled with an arc-extinguishing gas. In the above, a single first movable electrode for a closing resistance contact is provided around the first movable electrode for a main contact in a cylindrical and coaxial manner, and operates integrally with the first movable electrode for a main contact. A second movable electrode for the applied resistance contact is supported and fixed, and is disposed in a cylindrical and coaxial manner around the second movable electrode for the main contact opposed to the first movable electrode for the applied resistance contact; The opening and closing operation is performed in accordance with the operation of the second movable electrode for the contact, and the opening and closing operation of the closing resistance contact is performed prior to the opening and closing operation of the main contact. At least one of the second movable electrodes for the resistance contact A puffer type gas shut-off, characterized in that a closing resistor is disposed on one of the back sides and the closing resistor is electrically connected to a closing resistor contact electrode on the side where the closing resistor is provided. vessel. 2. A second movable electrode for a closing resistance contact is urged by a spring toward a first movable electrode side in a cylindrical holder fixed to the second movable electrode for a main contact via an insulator. The puffer-type gas circuit breaker according to claim 1, wherein the puffer-type gas circuit breaker is slidably supported.