JP3357682B2 - Puffer type gas circuit breaker with closing resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As the capacity of a power transmission system increases, the breaking capacity of circuit breakers used in substations and switchyards increases, and 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 breaking points of the circuit breaker is reduced. For example, a 550 kV double-break circuit breaker is currently in practical use, and it is required to further reduce the single-break circuit breaker.

By the way, in the case where such a large capacity circuit breaker is cut into one point, in order to improve the breaking performance, the opening speed of the breaker is remarkably increased as compared with the conventional two-point breaker. There is a need. Therefore, a fixed electrode and a movable electrode opposed thereto are provided, and in contrast to the conventional circuit breaker in which only the movable electrode is moved at the time of opening, the opposed two electrodes are simultaneously moved in the opposite directions to open. A so-called double-motion circuit breaker has been proposed. According to this double-motion circuit breaker, although the moving speed of each electrode is the same as that of the conventional circuit breaker, there is an advantage that the opening speed is significantly increased and the arc extinguishing performance is improved. .

FIGS. 5 and 6 show an example of such a double-motion circuit breaker. In the figure, reference numeral 1 denotes a double motion type gas circuit breaker, in which an arc-extinguishing chamber 3 is housed in a container 2 in which insulating gas is sealed. Reference numeral 4 denotes a first movable electrode of the arc-extinguishing chamber, and reference numeral 5 denotes a second movable electrode (corresponding to a conventional fixed electrode) of the arc-extinguishing chamber. The first movable electrode 4 is provided at the tip of a puffer cylinder 6, and an insulating nozzle 7 and a movable energizing contact 8 are concentrically arranged on the outer periphery thereof. An operation rod 9 is fixed to the center of the puffer cylinder 6, and the operation rod 9 is connected to an operation mechanism (not shown) via an insulating rod 10.

A movable support 12 fixedly supported on the insulating cylinder 11 and a puffer piston 13 fixedly supported on the movable support 12 are provided inside the puffer cylinder 6.
The space surrounded by the puffer piston 13 and the puffer cylinder 6 is a puffer chamber 14.

On the other hand, the arc-extinguishing chamber second movable electrode 5 is provided so as to protrude from the center of a surface of the energizing cylinder 15 facing the arc-extinguishing chamber first movable electrode 4, and is provided with the insulating nozzle 7 and the arc-extinguishing chamber first movable electrode 5.
It is configured to be insertable into the movable electrode 4. Further, on the outer periphery of the arc-extinguishing chamber second movable electrode 5, an arc-extinguishing chamber second movable energizing contact 16 and a second movable shield 17 which come into contact with the movable energizing contact 8 of the arc-extinguishing chamber first movable electrode are provided. Is provided.

The current-carrying cylinder 15 supporting the arc-extinguishing chamber second movable electrode 5 is slidably inserted into the current-carrying conductor 18 at the base thereof, and at the same time, the arc-extinguishing chamber first movable electrode 4 is supported.
Insulating rod 20 and link mechanism 19 disposed outside
Is connected to the base of the operating rod 9 for driving the arc-extinguishing chamber first movable electrode 4.

The link mechanism 19 comprises first and second connecting rods 19b and 19c rotatably connected to both ends of a link 19a. Link 19a is
The movable support 12 is rotatably supported about a fulcrum 19d supporting the link of the movable support 12 set to a predetermined link ratio. In addition, the first and second connecting rods 1
9b and 19c each have an operating rod 9 at one end.
And an insulating rod 20.

The circuit breaker of the double motion system configured as described above operates as described below. That is, when the operating mechanism (not shown) is driven in the closed state shown in FIG. 5, the operating rod 9 moves toward the operating mechanism (in the direction of the arrow “A” in the figure) at a predetermined speed, and accordingly, the operating rod 9 is moved.
The first movable electrode 4 of the arc-extinguishing chamber fixed to the tip of
In the direction, and a shutoff operation is performed between the second movable electrode 5 and the arc-extinguishing chamber.

On the other hand, with the operation of the operation rod 9,
The link mechanism 19 connected thereto is driven to move the insulating rod 20 to the side opposite to the operation rod 9 (to the left in the drawing). As a result, the current-carrying cylinder 15 and the arc-extinguishing chamber second movable electrode 5 fixed to the tip of the insulating rod 20 move to the opposite side (leftward in the drawing) from the arc-extinguishing chamber first movable electrode 4.

The movement of the operating rod 9 causes the puffer cylinder 6 fixed to the tip thereof to move with respect to the puffer piston 13, and the puffer chamber 14 is compressed. The arc is extinguished between the first and second movable electrodes in the arc-extinguishing chamber, which is opened by being guided by the insulating nozzle 7, extinguishes the arc generated between the two electrodes, and performs a breaking operation.

On the other hand, the closing operation is performed by driving the operation rod 9 to the side opposite to the shut-off operation, whereby the first arc-extinguishing chamber is turned off.
This is performed by relatively moving the movable electrode 4 and the second movable electrode 5.

As described above, in the double motion type circuit breaker, while the moving speed of the operating rod 9 is almost the same as that of the conventional circuit breaker, both the first movable electrode 4 and the second movable electrode 5 of the arc-extinguishing chamber are connected. Since the electrodes are driven in opposite directions, the relative separation speed between the two electrodes is improved by a factor of two or more, and even a large capacity circuit breaker can be cut by one point.

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 case, at the time of closing, a closing resistance contact having a closing resistance is closed in parallel with the main contact of the circuit breaker, and the main contact is closed in a state where the closing overvoltage is suppressed by the closing resistance. In this system, at the time of disconnection, it is necessary that the closing resistance contact is first opened and then the main contact is opened.

In order to satisfy this specification, a structure as shown in FIGS. 7 and 8 has been considered for the double-motion circuit breaker. 7 and 8 correspond to FIGS. 5 and 6 respectively.
FIG. 7 shows a closed state of the double-motion circuit breaker shown in FIG. The arc-extinguishing chamber 3 has the same structure as in FIGS.
Since the insulating rod 20 for driving the movable electrode 5 is attached to the side surface of the second movable electrode 5 at the center axis of the arc-extinguishing chamber 3, it is not shown in the drawing.

The closing resistance contact 21 includes a closing resistance contact first movable electrode 22 and a closing resistance contact second movable electrode 23 which are arranged to face each other. The base of the closing resistance contact first movable electrode 22 is mechanically connected by an arm extending from the vicinity of the base of the operation rod 9, and is integrated with the arc-extinguishing chamber first movable electrode 4 during closing and closing operations. It is configured to operate as follows.

Further, the cylinder 24 of the closing resistance contact is
It is fixed to the current-carrying cylinder 15 via an insulating member 25. The closing resistance contact second movable electrode 23 is movably supported in the cylinder 24 by a spring 26, and in the cut-off state, the closing resistance contact second movable electrode 23 is It is configured to urge the first movable electrode 22.

In addition, during the closing and closing operations, the closing movable contact second movable electrode 23, the cylinder 24 and the like are configured to move in the same manner as the arc-extinguishing chamber second movable electrode 5. Therefore, as described above, at the time of closing, the closing resistance contact 21 is closed first, and then the arc-extinguishing chamber 3 as the main contact is closed.
Further, at the time of interruption, the speed at which the spring 26 is restored is selected so as to be lower than the speed at which the closing resistance contact first movable electrode 22 moves, and the wipe of the electrode on the arc extinguishing chamber 3 side is selected to be large. Therefore, even if the closing movable contact first movable electrode 22 moves at the same speed as the first movable electrode 4 in the arc-extinguishing chamber, the closing resistive contact 21 is opened first, and then the arc-extinguishing chamber 3 as the main contact is opened. I do.

On the other hand, the closing resistor 27 is connected to the closing resistor contact 2
The closing resistance contact is electrically connected in series with the second movable electrode 23 through a rod 28 fixed to the movable electrode 23 and a contact portion 29 sliding on the rod 28, and the other end is connected to the conducting conductor 18 through the conductor 30. When the closing resistance contact 21 is closed, a current flows. The connecting portion 31 is fixed by an insulating rod 32 fixed to the movable support 12, and is also electrically connected to a lead conductor 33 extending to the outside of the gas circuit breaker.

[0020]

In the puffer type gas circuit breaker 1 of the double motion system constructed as described above, the first movable electrode 4, the puffer cylinder 6, and the second movable electrode 5 are operated by an unillustrated operation. Driven by a mechanism,
In order for these to move efficiently, they must move smoothly and linearly. The same applies to the first movable electrode 22 and the second movable electrode 23.

However, the double motion type puffer type gas circuit breaker with the closing resistance has the following problems to be solved. That is, when the shutoff operation is completed, the damper of the operating mechanism (not shown)
It is configured to absorb the inertial force to stop the movement. Therefore, the inertia force of the arc-extinguishing chamber second movable electrode 5 and the energizing cylinder 15 is absorbed through the insulating rod 20 and the link mechanism 19. The insulating rod 20 is mounted near the center of the energizing cylinder 15 so that no extra bending moment is generated in the arc-extinguishing chamber second movable electrode 5 and the energizing cylinder 15.

However, the closing movable contact second movable electrode 23
And the cylinder 24 are merely fixed to the energizing cylinder 15 by the insulating member 25. Therefore, as shown in FIG. Contact second movable electrode 23 and cylinder 24
Attempts to displace in the direction of arrow "B" in the figure. As a result, a bending moment is generated in the insulating member 25, and the closing movable contact second movable electrode 23 and the cylinder 24 are centered on the fixed portion of the energizing cylinder 15 of the insulating member 25 as shown in the direction of arrow "C" in the figure. And try to rotate.

At this time, the contact portion 29 is fixed and does not move.
Since it moves integrally with the movable electrode 23, it tries to displace in the direction of arrow “C” in the same manner, and the contact portion 29 and the rod 28
An excessive force is applied between them. As a result, the contact between the contact portion 29 and the rod 28 may be deteriorated, causing an arc to be generated during energization, or the contact portion 29 and the rod 28 may be damaged.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art. It is an object of the present invention to prevent a contact portion from being broken by a bending moment generated upon completion of a shut-off operation, and to apply a closing resistance. An object of the present invention is to provide a highly reliable puffer-type gas circuit breaker with a large-capacity one-point cut-off resistor which can surely allow a current to flow and suppress overvoltage at the time of turn-on.

[0025]

A puffer-type gas circuit breaker with a closing resistor according to the present invention is configured such that a second movable electrode of a closing resistor contact slides along a guide member fixed to the closing resistor. A spring receiving portion is fixed to an insulator fixed to the current-carrying cylinder, a spring is disposed between the spring receiving portion and the closing movable contact second movable electrode. A gap is provided between the spring receiving portion and the inner periphery of the spring receiving portion.

[0026]

According to the puffer type gas circuit breaker with a closing resistor of the present invention, the sliding of the second movable electrode of the closing resistor contact is performed by a fixed sliding member. The closing resistance contact can be absorbed by a spring that drives the second movable electrode. Thereby, the closing resistance contact second movable electrode can smoothly and linearly move in the operation direction, and no excessive force is generated in the contact portion leading to the closing resistance, preventing its deformation and breakage, When the closing resistance is energized, the current flows reliably.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to FIGS. Note that FIG. 1 shows the closed state, and FIG.
Indicates a cutoff state. Further, the same members as those of the conventional type shown in FIGS. 5 to 8 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, as shown in the figure, the second movable electrode 42 of the closing resistor contact is formed in a hollow cylindrical shape, and a guide attached to one end of the closing resistor 27 via the connecting portion 41. By being inserted into the part 43, it is slidably supported in the left-right direction in the figure and is also electrically connected. A spring engaging portion 42a is formed at the tip of the second movable electrode 42 of the closing resistance contact, and the spring 26 is mounted between the spring engaging portion 42a and a spring receiving portion 44 described later. further,
At the rear end of the closing resistance contact second movable electrode 42, a flange portion 42b bent outward is formed.

On the other hand, a spring receiving portion 44 is fixed to the energizing cylinder 15 via an insulating member 25. This spring receiving portion 44
Is formed in a ring shape, and the closing resistance contact second movable electrode 42 is movably disposed at the center thereof. In addition,
A predetermined gap is provided between the inner periphery of the spring receiving portion 44 and the outer periphery of the second movable electrode 42 of the closing resistance contact so that they do not mechanically contact each other. Further, the movement of the spring receiving portion 44 to the left in the drawing corresponds to the closing resistance contact second movable electrode 4.
2 is regulated by a flange 42b formed at the rear end. Other configurations are the same as those of the conventional type shown in FIGS.

In the puffer type gas circuit breaker with a closing resistor of this embodiment having such a configuration, the displacement of the bending moment generated at the completion of the breaking operation can be absorbed as described below. That is, in FIG. 4, when the shutoff operation is completed, the closing resistance contact second movable electrode 42 and the spring receiving portion 44 tend to be displaced in the direction of arrow "D" due to inertial force. In this case, since the spring receiving portion 44 is fixed to the energizing cylinder 15 via the insulating member 25, when a bending moment is generated in the insulating member 25, the spring receiving portion 44 is moved to the insulating member 25 as shown by the arrow "E". Is trying to rotate around a portion fixed to the energizing cylinder 15.

However, since the spring 26 is provided between the spring receiving portion 44 and the closing resistance contact second movable electrode 42, the spring receiving portion 44 is displaced by a bending moment in a direction perpendicular to the operation direction of the closing resistance contact. If so, the displacement is absorbed by the spring 26. That is, since the spring 26 is also displaced in that direction, the bending moment is not transmitted to the closing movable contact second movable electrode 42.

As a result, the closing movable contact second movable electrode 42
Does not act to displace in the direction perpendicular to the operation direction, but smoothly displaces in the left-right direction in the figure along the guide portion 43, and absorbs the inertial force by the spring 26 or other means, and The movement can be stopped without generating excessive force.

Thus, it is possible to prevent deformation and breakage of a contact portion of the closing resistance contact with the closing resistance due to a bending moment generated at the time of completion of the breaking operation, so that current can flow reliably when the closing resistance is energized. .

Note that the present invention is not limited to the above-described embodiment, but a puffer type gas with a closing resistance in which a closing resistance is connected between the first movable electrode of the arc-extinguishing chamber and the closing resistance contact first movable electrode. It can also be applied to circuit breakers.

[0035]

As described above, according to the present invention, the second movable electrode of the closing resistance contact is configured to slide along the guide member fixed to the closing resistance, and is fixed to the energized cylinder. A spring receiving portion is fixed to the insulator, and a spring is disposed between the spring receiving portion and the second movable electrode of the closing resistance contact.
By providing a gap between the outer periphery of the closing movable contact second movable electrode and the inner periphery of the spring receiving portion, it is possible to prevent breakage of the contact portion due to a bending moment generated at the time of completion of the breaking operation, and to ensure that the current flows when the closing resistance is energized. Reliable large capacity 1 that can flow and suppress overvoltage at the time of closing
A puffer-type gas circuit breaker with a point-breaking closing resistor can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a closed state of an embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 2 is a cross-sectional view showing an interrupted state of an embodiment of a puffer type gas circuit breaker with a closing resistor according to the present invention.

FIG. 3 is a detailed view showing the vicinity of a second movable electrode of the closing resistance contact of the embodiment shown in FIG. 1;

4 is a detailed view showing a state at the time of completion of a breaking operation in the vicinity of a second movable electrode of a closing resistance contact shown in FIG. 3;

FIG. 5 is a cross-sectional view showing a closed state of a conventionally used double motion type puffer type gas circuit breaker.

FIG. 6 is a sectional view showing a cut-off state of the puffer type gas circuit breaker shown in FIG. 5;

FIG. 7 is a sectional view showing a closed state of a conventional double motion type puffer type gas circuit breaker with a closing resistor.

8 is a cross-sectional view showing a cut-off state of the puffer type gas circuit breaker with a closing resistor shown in FIG. 7;

9 is a detailed view showing a state when the circuit breaker operation is completed near the second movable electrode of the closing resistance contact of the puffer type gas circuit breaker shown in FIG. 7;

[Description of Signs] 4 ... First movable electrode of arc-extinguishing chamber 5 ... Second movable electrode of arc-extinguishing chamber 15 ... Electrical cylinder 19 ... Link mechanism 20 ... Insulating rod 22 ... Mating resistance contact first movable electrode 23 ... Making resistance Contact second movable electrode 24 ... Cylinder 25 ... Insulating member 26 ... Spring 27 ... Closed resistance 42 ... Closed resistance Contact second movable electrode 42a ... Spring locking part 42b ... Flange part 43 ... Guide part 44 ... Spring receiving part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-94746 (JP, A) JP-A-4-282522 (JP, A) JP-A-3-274626 (JP, A) JP-A-61- 7520 (JP, A) JP-A-54-10973 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 33/70-33/99

Claims (1)

(57) [Claims] 1. A first movable electrode and a second movable electrode which are freely contactable and separable are disposed in a container filled with an arc-extinguishing gas so as to face each other, and each of the first movable electrode and the second movable electrode is driven by one drive. An arc-extinguishing gas in the puffer cylinder is compressed by a puffer cylinder that is driven by the device to the opposite side and moves integrally with the first movable electrode, and a puffer piston that slides in the puffer cylinder. And an arc extinguishing chamber for extinguishing the arc generated between the first movable electrode and the second movable electrode to extinguish the arc, and a closing resistance contact first movable which moves integrally with the first movable electrode of the arc extinguishing chamber. An electrode, a closing resistance contact including a second movable electrode connected to the second movable electrode of the arc-extinguishing chamber via an insulator and a spring for obtaining a wipe of the closing resistance contact, and the closing resistance contact; The second movable electrode and the arc-extinguishing chamber In a puffer type gas circuit breaker with a closing resistor electrically connected between two movable electrodes, the closing movable contact second movable electrode slides along a guide member fixed to the closing resistor. A spring receiving portion is fixed to the insulator, and a spring is disposed between the spring receiving portion and the closing movable contact second movable electrode.
A puffer-type gas circuit breaker with a closing resistor, wherein a gap is provided between the outer periphery of the second movable electrode of the closing resistor contact and the inner periphery of the spring receiving portion.