JP2874917B2 - 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, a two-point breaker with a breaking current of 50 KA is currently in practical use in the 550 KV system.
It is required to be pointed.

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 type circuit breaker is shown in FIG.
This is shown in FIG. 7 and FIG. In the figure, 1 is a first for a main contact.
The movable electrode 10 is a second movable electrode for a main contact (corresponding to a conventional fixed electrode). The first movable electrode 1 for a main contact 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,
A puffer piston 8 supported and fixed to the insulating cylinder 7 is inserted inside the puffer cylinder 2, and a 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 for the main contact is provided so as to protrude from the center of the energized cylinder 11 facing the first movable electrode 1 for the main contact, and is provided with the insulating nozzle 3 and the first movable electrode 1 for the main contact.
It is configured to be inserted into. On the outer periphery of the second movable electrode 10 for the main contact, a second movable energizing contact 12 and a second movable shield 13 that are in contact with the movable energizing contact 4 of the first movable electrode for the main contact are provided. I have. The current-carrying cylinder 11 supporting the main contact second movable electrode 10 is slidably inserted into the current-carrying conductor 14 at the base thereof,
It is connected to the base of the operating rod 5 for driving the first movable electrode 1 for main contacts via an insulating rod 15 and a link mechanism 16 provided outside the first movable electrode 1 for main contacts.
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.
The link 16a is rotatably supported by the link support 16d about a fulcrum 16e of the link support 16d set to a predetermined link ratio. Each of the first and second connecting rods 16b and 16c is rotatably connected to the operating rod 5 and the insulating rod 15 at one end thereof. The link support 16d is provided on an insulating tube 7 insulated and fixed to a container (not shown).
It is fixed to.

When the operating mechanism (not shown) is driven in the closed state shown in FIG. 6, the operating rod 5 moves to the operating mechanism side (the right side in the figure) at a predetermined speed. Then, the first movable electrode for main contact 1 fixed to the tip moves rightward, and a breaking operation is performed with the second movable electrode 10 for main contact. On the other hand, with the operation of the operation rod 5, the link mechanism 16 connected thereto is connected.
Is driven to move the insulating rod 15 to the opposite side (left side in the figure) from the operation rod 5. As a result, this insulating rod
The energization cylinder 11 and the second movable electrode 10 for the main contact, which are fixed to the tip of the 15, move in the opposite direction (left side in the figure) to the first movable electrode 1 for the main contact. Further, 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 passage 7, and the puffer chamber 9 is compressed. Is guided by the insulating nozzle 3 and sprayed between the first and second electrodes for the main contact, which are separated from each other, and an arc extinguishing operation is performed.

In the closing operation, the operating rod 5 is driven in the direction opposite to the blocking operation, and the first and second movable electrodes 1 and 10 for the main contact are driven.
Are relatively close to each other.

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 for the main contact are driven in opposite directions, the relative opening between the two electrodes is increased. The separation speed is improved about twice, and even a large capacity circuit breaker can be cut at 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, the switching overvoltage resistance, the size of the circuit breaker and the overall size of the gas insulated switchgear using the same become a serious problem, and it is important to solve this problem. Is an important task.

First, Fig. 8 shows a conventional 550KV class double break circuit 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 the conventional circuit breaker in which only one electrode is movable, the movable electrode and the closing resistance contact are simultaneously moved at the same speed by using the same driving source. The difference in shape (the main contact has an electrode structure using a wipe, whereas the closing resistance contact uses a butt contact using a spring) was used.

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 a puffer type gas circuit breaker of the present invention, a closing resistance contact is provided on a side of a main contact, and a first movable electrode for the closing resistance contact is formed using a link mechanism. It is configured to operate integrally with the first movable electrode for the main contact, and the second movable electrode for the closing resistance contact is
The switching member is mounted on a support member provided on the second movable electrode side for the main contact via an insulator so that 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 at least one of the back surfaces of the electrodes for use.

(Operation) According to the puffer type gas circuit breaker of the present invention, the switching speed of the closing resistance contact can be easily adjusted with respect to the relative switching speed of the main contact by changing the link ratio of the link mechanism. . Further, by appropriately setting the link ratio, the insulation recovery speed of the closing resistance contact portion can be made faster than the insulation recovery speed of the main contact portion. further,
By arranging the closing resistor contact electrode on the side of the main contact electrode and arranging the closing resistor on the back side of the closing resistor contact electrode, an extremely compact configuration can be achieved.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to FIGS. 1 to 3. The same members as those of the conventional type shown in FIGS. 6 and 7 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, as shown in FIGS. 1 and 2, the first movable electrode 21 for the closing resistance contact is connected to a support member 23 attached to the insulating cylinder 7 via a link mechanism 22. ing. The link mechanism 22 is connected to a link support 22a fixed to a support member 23 and an operating rod 5 for driving the first movable electrode 1 for a main contact via a pin connector 22b. Operating rod 5 with 22a as a fulcrum
And a second connecting rod 22d which is pin-connected to the first connecting rod 22c and performs a circular motion in conjunction with the first connecting rod 22c.

On the other hand, the second movable electrode 24 for the closing resistance contact is slidable in a case 27 attached to a support member 25 supporting the conducting conductor 14 of the second movable electrode 10 for the main contact via an insulator 26. Supported. The case 27 is provided with a locking portion 27a at the tip end thereof, and the second movable electrode 24 for the closing resistance contact is urged toward the first movable electrode side (right side in the drawing) by a spring 28 to house the case. Have been. Further, in the insulator 26 disposed on the back side of the second movable electrode 24 for the closing resistance contact,
A closing resistor 29 is provided, and is electrically connected to the second movable electrode 24 for the closing resistor contact.

FIG. 1 shows the closed state of the circuit breaker, FIG. 2 shows the closed state, and FIG. 3 shows a view taken along the line AA of FIG. 1 and 2, members (for example, the link mechanism 16, the insulating rod 15, etc. in FIG. 6) provided for opening and closing the main contact are omitted.

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, the transition from the closed state to the closed state shown in FIG. 1 is accompanied by the movement of the operating rod 5 for performing the opening operation of the first movable electrode 1 for the main contact and the second movable electrode 10 for the main contact. The first connecting rod 22c of the link mechanism 22, which is connected thereto by the pin connecting portion 22b, rotates to the blocking side. At this time, the link ratio of the connecting rods 22c and 22d constituting the link mechanism 22 is such that the closing resistance contact electrodes 21 and 24 operate prior to the closing operation or closing operation of the main contact electrodes 1 and 10. First, the first movable electrode 21 for the closing resistance contact and the second movable electrode 24 for the closing resistance contact open, and then the first movable electrode 1 for the main contact in the arc-extinguishing chamber. And the main contact second movable electrode 10 are separated. On the other hand, at the time of closing, first, the first movable electrode 21 for closing resistance contact and the second movable electrode 24 for closing resistance contact are closed, and accordingly, the closing resistor 29 is inserted into the circuit for a certain time. , First movable electrode 1 for main contact in arc-extinguishing chamber
When the second movable electrode 10 for main contact is turned on, no current flows through the closing resistor 29.

As described above, according to the present embodiment, the closing resistance contact electrode can operate before the main contact electrode interrupting operation or closing operation, and the insulation recovery speed of the closing resistance contact portion can be reduced. In addition, the insulation recovery speed of the main contact portion can be made faster. Further, by arranging the closing resistance contact electrode on the side of the main contact electrode and arranging the closing resistor on the back side of the second resistance electrode for the closing resistance contact, an extremely compact configuration can be achieved.

The present invention is not limited to the embodiment described above, and the closing resistor may be disposed on the back side of the first movable electrode 21 for the closing resistance contact. As shown in the above, the closing resistors 29 and 30 may be disposed on the back side of the second movable electrode 24 for closing resistance contact and the first movable electrode 21 for closing resistance contact, respectively. In this case, the second connecting rod 22d that constitutes the link mechanism 22 is made of an insulating material.
A sliding energizing portion 32 is disposed on the insulating material 31 via an insulator 31, and the operating rod of the first movable electrode 21 for the closing resistance contact slides in the sliding energizing portion 32. Further, the closing resistor 30 is housed in the insulator 31. Also in this case, the same effect as in the above embodiment can be obtained, and the space of the puffer type gas circuit breaker can be effectively used because the closing resistor is divided into two parts.

[Effects of the Invention] As described above, according to the present invention, the closing resistance contact is provided on the side of the main contact, and the first movable electrode for the closing contact is used as the first movable electrode for the main contact using a link mechanism. And a second movable electrode for a closing resistance contact,
The switching member is mounted on a support member provided on the second movable electrode side for the main contact via an insulator so that the opening and closing operation of the closing resistance contact is performed prior to the opening and closing operation of the main contact. By disposing a closing resistor on at least one of the back sides of the electrodes, the size of the equipment can be reduced, the overvoltage at closing can be reduced, and the closing resistance contact at opening or closing can be isolated. A highly reliable puffer-type gas circuit breaker capable of improving the recovery speed can be provided.

[Brief description of the drawings]

1 and 2 are cross-sectional views showing an embodiment of a puffer type gas circuit breaker according to the present invention. FIG. 1 shows a closed state of the circuit breaker, FIG. 2 shows a closed state, and FIG. AA in FIG.
4 and 5 are sectional views showing another embodiment of the present invention. FIG. 4 shows a closed state of a circuit breaker, FIG. 5 shows a closed state, and FIGS. FIG. 7 is a cross-sectional view showing an example of a conventionally used double-motion type puffer-type gas circuit breaker. FIG. 6 shows a closed state of the circuit breaker, FIG. 7 shows a closed state, and FIG. It is a figure showing the insulation recovery characteristic of a main contact and a closing resistance contact. DESCRIPTION OF SYMBOLS 1 ... 1st movable electrode for main contacts, 2 ... Puffer cylinder, 3
... Insulating nozzle, 4 ... Movable contact, 5 ... Operation rod,
6: insulating rod, 7: insulating cylinder, 8: puffer piston,
9: Puffer chamber, 10: Second movable electrode for main contact, 11: Energized cylinder, 12: Second movable energized contact, 13: Second movable shield, 14: Conductor, 15: Insulated rod, 16: Link Mechanism, 16a: link, 16b, 16c: connecting rod, 16d: link support, 16e: fulcrum, 21: first movable electrode for closing resistance contact, 22
... Link mechanism, 22a ... Link support part, 22b ... Pin connection part,
22c: first connecting rod, 22d: second connecting rod, 23: supporting member, 24: second movable electrode for closing resistance contact, 25: supporting member,
26 ... insulator, 27 ... case, 27a ... locking part, 28 ... spring, 29
... closing resistor, 30 ... closing resistor, 31 ... insulator, 32 ... sliding energizing part.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-84526 (JP, A) JP-B-56-26926 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 33/70

Claims (1)

(57) [Claims] 1. A double-motion type puffer type in which a main contact formed by opposing a first movable electrode and a second movable electrode for a main contact which can be freely contacted and separated is accommodated in a container filled with an arc-extinguishing gas. In the gas circuit breaker, a closing resistance contact is provided on a side of the main contact, and the first movable electrode for the closing resistance contact is connected to a support member fixed to the container via a link mechanism, and A link mechanism is connected to an operating rod for driving the first movable electrode for the main contact, and is configured to interlock with the operating rod. On the other hand, the second movable electrode for the closing resistance contact is connected to the second movable electrode for the main contact. A first movable electrode for the closing resistance contact, which is attached to a supporting member provided on the electrode side via an insulator, and wherein the opening and closing operation of the closing resistance contact is performed prior to the opening and closing operation of the main contact; Second for closing resistance contact A closing resistor is disposed on at least one back side of the movable electrode, and the closing resistor is electrically connected to the closing resistor contact electrode on the side where the closing resistor is provided. Puffer type gas circuit breaker.