JPH04286822A - Buffer gas circuit breaker with closing resistance contact - Google Patents

Abstract

PURPOSE:To provide a buffer gas circuit breaker with a double-motion system closing resistance contact which has high reliability, large capacity and one-point cutoff operation by securely preventing the deformation of a member in breaking while securely holding the function of the closing resistance contact in closing. CONSTITUTION:The second moving electrode 102 with a closing resistance contact is pushed into a cylindrical electrode 105 by the first moving electrode 101 with a closing resistance contact, so that a spring 106 is pushed and shrinked into an energy stored condition. In such a state, the spring 106 releases stored energy on the way of breaking and instantly thrusts the second moving electrode 102 with the closing resistance contact, so that the engagement portion 102a of the electrode 102 collides with the stopper 105a of the electrode 105 at a high speed. The collision energy is absorbed by an elastic sheet 107 on the inside face of the stopper 105. Bending moment momentarily applied to an insulation member 103 via which the second moving electrode 10 in a quenching chamber is connected to the electrode 105 is thus made extremely smaller.

Description

[Detailed description of the invention]

[Purpose 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 contact, and more particularly to a puffer-type gas circuit breaker with a single-break closing resistance contact.

0002

2. Description of the Related Art As the capacity of power transmission systems increases, circuit breakers used in substations and switchyards are required to have increased breaking capacity and improved reliability. In order to improve the reliability of circuit breakers, it is important to reduce the number of parts and simplify the structure. As a specific method for this purpose, efforts have recently been made to reduce the number of breaking points of the circuit breaker. For example, a 550 kV class two-point circuit breaker is currently in practical use, but there is a further demand for a one-point circuit breaker.

By the way, if such a large capacity circuit breaker is
In order to improve the breaking performance when using point cutting,
Compared to conventional two-point circuit breakers, the opening speed needs to be much faster. For this reason, in contrast to conventional circuit breakers that have a fixed electrode and a movable electrode that opposes it, and only move the movable electrode when opening the circuit, recently there has been a so-called circuit breaker that opens the circuit by simultaneously moving the opposing electrodes. A new type of circuit breaker called the double motion type has been proposed. According to this double motion type circuit breaker, although the moving speed of each electrode is similar to that of a conventional circuit breaker, the opening speed is significantly faster, and arc extinguishing performance is improved.

An example of such a double motion type puffer type gas circuit breaker is shown in FIGS. 6 and 7. 6 and 7 are diagrams respectively showing the on state and the shut off state, and in each figure, 1 is the first movable arc extinguishing chamber disposed in a container filled with an arc extinguishing gas such as SF6 gas. The electrode 10 is an arc-extinguishing chamber second movable electrode (corresponding to a conventional fixed electrode) disposed opposite the arc-extinguishing chamber second movable electrode 1 in the same container. The arc extinguishing chamber first movable electrode 1 is provided at the tip of the puffer cylinder 2, and an insulating nozzle 3 and a movable current-carrying contact 4 are arranged concentrically around the outer circumference thereof. An operating rod 5 is fixed to the center of the puffer cylinder 2, and the operating rod 5 is connected to an operating mechanism (not shown) via an insulating rod 6. A puffer piston 8 fixedly supported by an insulating cylinder 7 is inserted inside the puffer cylinder 2, and a space surrounded by the puffer piston 8 and the puffer cylinder 2 forms a puffer chamber 9.

[0005] The second movable electrode 10 in the arc extinguishing chamber has a current-carrying cylinder 11
The arc-extinguishing chamber first movable electrode 1 is provided in a protruding manner at the center of the surface facing the arc-extinguishing chamber first movable electrode 1, and is inserted into the insulating nozzle 3 and the arc-extinguishing chamber first movable electrode 1. On the outer periphery of the arc-extinguishing chamber second movable electrode 10, there are provided a movable energizing contact 12 of the arc-extinguishing chamber second movable electrode 10 that contacts the movable energizing contact 4 of the arc-extinguishing first movable electrode 1, and a second movable A shield 13 is provided. These arc-extinguishing second movable electrode 10 and movable energizing contact 12
, and the current-carrying cylinder 11 supporting the second movable shield 13 is slidably inserted into the current-carrying conductor 14 at its base, and at the same time, the current-carrying cylinder 11 supporting the second movable shield 13 is slidably inserted into the current-carrying conductor 14 at its base, and at the same time an insulating cylinder disposed outside the first movable electrode 1 in the arc-extinguishing chamber is inserted into the current-carrying conductor 14 at its base. It is connected via a rod 15 and a link mechanism 16 to the base of an operating rod 5 that drives the arc extinguishing chamber first movable electrode 1 .

[0006] This link mechanism 16 includes a link 16a,
The link 16a is composed of first and second connecting rods 16b and 16c rotatably connected to both ends of the link 16a, and a link support portion 16d. The link 16a is a fulcrum 16e of a link support portion 16d set to a predetermined link ratio.
It is rotatably supported on the link support portion 16d about the axis. In addition, each of the first and second connecting rods 16b, 1
6c is rotatably connected to the operating rod 5 and the insulating rod 15 at one end of each. Note that the link support portion 16d is insulated and fixed to a container (not shown).

In the double-motion puffer type gas circuit breaker constructed as described above, when the operating mechanism (not shown) is driven in the closed state shown in FIG.
moves at a predetermined speed toward the operating mechanism (arrow side in the figure), and the arc-extinguishing chamber first movable electrode 1 fixed to its tip moves in the direction of the arrow, creating a space between it and the arc-extinguishing chamber second movable electrode 10. A cutoff operation is performed. On the other hand, as the operating rod 5 moves, the link mechanism 16 connected thereto is driven, and the insulating rod 1
5 to the side opposite to the operating rod 5 (the side opposite to the arrow in the figure). As a result, the current-carrying cylinder 11 fixed to the tip of this insulating rod 15 and the second movable electrode 10 in the arc-extinguishing chamber,
The side opposite to the first movable electrode 1 in the arc extinguishing chamber (the side opposite to the arrow in the figure)
Move to. Furthermore, as the operating rod 5 moves, the puffer cylinder 2 fixed at its tip moves relative to the puffer piston 8 fixed to the insulating cylinder 7, and the puffer chamber 9 is compressed. The gas is guided to the insulating nozzle 3 and is blown onto the arc generated between the first and second movable electrodes 1 and 10 in the arc extinguishing chamber to extinguish the arc.
A blocking action is performed.

[0008] During the closing operation, the operating rod 5 is driven in the opposite direction to the above-mentioned breaking operation, thereby causing the arc-extinguishing chamber first movable electrode 1 and the arc-extinguishing chamber second movable electrode 10 to approach each other relatively.

As described above, in the double motion type puffer type gas circuit breaker, even if the moving speed of the operating rod 5 is about the same as that of the conventional puffer type gas circuit breaker, the arc extinguishing chamber first movable electrode 1, the arc extinguishing chamber Since both chamber second movable electrodes 10 are driven, the relative opening speed between both electrodes can be increased by more than double, and as a result, single-point disconnection is possible even in a large capacity circuit breaker.

By the way, in circuit breakers for lines in large-capacity systems such as 550 kV class, a closing resistance method is adopted in order to suppress the closing overvoltage at the time of closing. In this closing resistance method, a closing resistance contact having a closing resistance is connected in parallel with the main contact of the circuit breaker, and the main contact is closed while the closing overvoltage is suppressed by the closing resistance. In this closing resistance method, when opening, it is necessary that the closing resistance contact first be opened, and then the main contact must be opened.

In order to satisfy the specifications of the closing resistance method, the double motion type puffer type gas circuit breaker has a structure as shown in FIG. 3. In this case, FIG. 3 shows a state in the middle of operation in which only the closing resistance contact is closed and the main contact is closed. In addition, Figure 3
In this case, the configuration of the main contact part side of the arc extinguishing chamber except for the closing resistance contact part is the same as the configuration of the arc extinguishing chamber of the puffer type gas circuit breaker shown in Figs. Reference numerals are given and explanations are omitted.

As shown in FIG. 3, the closing resistance contact first movable electrode 101 is fixed to the operating rod 5 of the arc extinguishing chamber first movable electrode 1. As shown in FIG. Then, the closing resistance contact second movable electrode 1
02 is mechanically connected to the arc extinguishing chamber second movable electrode 10 via an insulating member 103 and a wipe mechanism described later, and is also connected to the arc extinguishing chamber second movable electrode 10 via a closing resistor 104.
electrically connected to.

That is, the wiping mechanism of the closing resistance contact includes a cylindrical electrode 105 connected to the second movable electrode 10 of the arc extinguishing chamber via an insulating member 103, and a wiping mechanism provided at the tip of the cylindrical electrode 105. a stopper 105a, a spring 106 housed in this cylindrical electrode 105, and a second closing resistance contact.
It is provided at the base of the movable electrode 102 and consists of an engaging part 102a housed in a cylindrical electrode 105 together with a spring 106. By such a wipe mechanism, the engaging portion 102 of the second movable electrode 102 of the closing resistance contact
A has a structure in which a wipe is obtained by sliding in a cylindrical electrode 105 via a spring 106. Further, the engaging portion 102a of the second movable electrode 102 of the closing resistance contact is connected to the spring 1
Due to the accumulated force of 06, it comes into contact with the stopper 105a and is positioned at the tip of the cylindrical electrode 105.

[0014]

[Problems to be Solved by the Invention] However, as described above, in the configuration shown in FIG. 3 in which the making resistance contact is made of a butt contact type using a spring to satisfy the specifications of the making resistance contact, the following is done. There were some shortcomings. That is, in the puffer type gas circuit breaker with closing resistance contact shown in FIG. If the responsiveness is poor, there is a possibility that the closing resistance contact second movable electrode 102 may not perform the desired operation.

[0015] Such drawbacks will be explained with reference to FIGS. 4 and 5. Here, FIG. 4 is a time chart showing desirable operations in a puffer-type gas circuit breaker with a double-motion closing resistance contact, and FIG. It is a time chart showing the operation.

First, as shown in FIG. 4, during the closing operation, the closing resistance contact first movable electrode 101 and the closing resistance contact second movable electrode 101
The movable electrode 102 includes a first movable electrode 1 in the arc-extinguishing chamber and a second movable electrode in the arc-extinguishing chamber.
It moves in conjunction with the movable electrode 10, and first the closing resistance contact is set to O.
Do N. Then, the closing resistor 104 is inserted for a certain period of time, and then the main contact of the arc extinguishing chamber is closed, so that no current flows through the closing resistor 104. After the making resistance contact is turned ON, the making resistance contact second movable electrode 102 is moved by the spring 106 by the making resistance contact first movable electrode 101.
is pushed into the cylindrical electrode 105 by the width of the wipe.

However, if the natural frequency of the spring system consisting of the second movable electrode 102 of the closing resistance contact and the spring 106 is low, the operation of the second movable electrode 10 of the arc-extinguishing chamber is affected by the second movable electrode of the closing resistance contact.
The movement of the movable electrode 102 becomes unable to follow,
Starts operation after a certain time delay. In other words, when the natural frequency of the spring system is low, the second arc extinguishing chamber
Even if the movable electrode 10 presses the spring 106, the response of the spring 106 is poor, so the amount by which the spring 106 contracts is greater than the amount by which the spring 106 moves, and the closing resistance contact No motion is transmitted to the second movable electrode 102. Therefore, it becomes as if the spring 106 insulates the closing resistance contact second movable electrode 102 from the operation of the arc extinguishing chamber second movable electrode 10 . As a result, the second movable electrode 102 of the closing resistance contact, as shown in FIG.
5, and there was a possibility that an inconvenient operation as shown in FIG. 5 would occur. That is, in a circuit breaker whose spring system has a low natural frequency, there is a tendency for the closing resistance contact to be unable to turn on before the main contact in the arc extinguishing chamber.

In order to avoid such inconveniences, it is necessary to increase the natural frequency of the spring system, but in this case, the following new drawbacks arise. That is, when the natural frequency of the spring system is increased, the energy possessed by the spring 106 increases, and during the cutoff operation, a large amount of energy stored in the spring 106 until then is released. Then, the large energy released in this way is transmitted to the second movable electrode 102 of the making resistance contact, and the second movable electrode 102 of the making resistance contact, with large energy, hits the stopper 105a of the cylindrical electrode 105. collide. Due to this collision, a large bending moment is instantaneously applied to the insulating member 103 that connects the arc extinguishing chamber second movable electrode 10 and the cylindrical electrode 105. In particular, in the case of a double-motion puffer-type gas circuit breaker, the second movable electrode 102 of the closing resistance contact, which is fixed in a conventional puffer-type gas circuit breaker, operates, so the relative operating speed is significantly increased. In addition, the bending moment instantaneously applied to the insulating member 103 during a collision becomes extremely large. As a result, in a circuit breaker with a high natural frequency of the spring system, the insulating member 103 has
A large bending stress due to collision is repeatedly generated each time the interrupting operation is performed, and as a result, there is a problem in that the insulating member 103 is deformed or destroyed.

The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to reliably maintain the function of the closing resistance contact during the closing operation, and to It is an object of the present invention to provide a puffer type gas circuit breaker with a closing resistance contact that can reliably prevent deformation or destruction of members during operation. [Structure of the invention]

[0020]

[Means for Solving the Problems] A puffer type gas circuit breaker with a closing resistance contact according to the present invention has a first movable electrode in an arc extinguishing chamber that can be freely moved into and out of a container filled with an arc extinguishing gas, and a movable electrode in a second arc extinguishing chamber.
movable electrodes are arranged facing each other, each of the first movable electrode of the arc extinguishing chamber and the second movable electrode of the arc extinguishing chamber is driven to opposite sides by one drive device, and is integrated with the first movable electrode of the arc extinguishing chamber. The arc-extinguishing gas in the puffer cylinder is compressed by a puffer cylinder that moves and a puffer piston that slides inside the puffer cylinder, and this compressed gas is ejected as a gas stream from an insulated nozzle fixed to the puffer cylinder. and an arc extinguishing chamber that extinguishes an arc generated between the arc extinguishing chamber first movable electrode and the arc extinguishing chamber second movable electrode, and is fixed to the arc extinguishing chamber first movable electrode. A closing resistance contact consisting of a first movable electrode of the closing resistance contact, a second movable electrode of the closing resistance contact connected to the second movable electrode of the arc extinguishing chamber through an insulating member and a wiping mechanism for obtaining a wipe of the closing resistance contact. and a double-motion type puffer type gas circuit breaker with a closing resistance contact, comprising a closing resistance electrically connected between the second movable electrode of the closing resistance contact and the second movable electrode of the arc extinguishing chamber. The mechanism includes a cylindrical electrode connected to the second movable electrode of the arc extinguishing chamber via an insulating member, a stopper provided at one end of the cylindrical electrode, and a stopper housed within the cylindrical electrode. Spring and second closing resistance contact
The closing resistance contact second movable electrode has an engaging part provided on the movable electrode and housed in a cylindrical electrode together with a spring. The elastic member is arranged so that it is pressed and abuts against the stopper of the cylindrical electrode and is positioned, and an elastic member is provided at the abutment portion between the stopper of the cylindrical electrode and the engaging portion of the second movable electrode of the closing resistance contact. It is characterized by being fixed.

[0021]

[Operation] The operation of the present invention having the above-mentioned structure is as follows. That is, during the breaking operation, the large spring force of the wipe mechanism that had been stored by the first movable electrode of the making resistance contact is released. Due to this large spring force, the engaging part of the second movable electrode of the closing resistance contact has a very large force against the stopper of the cylindrical electrode of the wipe mechanism, in addition to the fact that the speed is high due to the double motion method. Trying to collide with impact force. In this case, in the present invention, since an elastic member is fixed to the abutting part between the stopper of the cylindrical electrode and the engaging part of the second movable electrode of the closing resistance contact, the elastic member absorbs the energy of the collision. can be absorbed. As a result, a large impact force is not transmitted to the insulating member that connects the main contact part and the wipe mechanism of the closing resistance contact part, and therefore, the bending moment applied is small.
Bending stress generated in the insulating member can be reduced. Therefore,
Even if the interruption operation is repeated, deformation or destruction of the insulating member can be effectively prevented.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a puffer type gas circuit breaker with a closing resistance contact according to the present invention will be described in detail below with reference to FIG. Note that the configuration of this embodiment is as follows except for the elastic member (elastic sheet 107), which is a feature of the present invention.
Since it is basically the same as the prior art shown in FIG. 3, the same parts are given the same reference numerals and the explanation will be omitted.

First, FIG. 1 shows a state in the middle of operation in which only the closing resistance contact is closed and the main contact is closed. As shown in FIG. 1, in the stopper 105a of the cylindrical electrode 105 constituting the wipe mechanism, an elastic As a member, an elastic sheet 107 made of polytetrafluoroethylene resin is fixed.

In the state shown in FIG. 1, the making resistance contact first movable electrode 101 causes the making resistance contact second movable electrode 1
02 is pushed into the cylindrical electrode 105, whereby the spring 106 is compressed and in a charged state. 1, the spring 106 releases its stored large energy and instantly presses the second movable electrode 102 of the closing resistance contact. Engagement portion 10 of second movable electrode 102
2a collides with the stopper 105a of the cylindrical electrode 105 with extremely high speed and energy.

In response to this collision, in this embodiment,
An elastic sheet 107 made of tetrafluoroethylene resin is provided as an elastic member on the inner surface of the stopper 105a of the cylindrical electrode 105.
Since the elastic sheet 107 is fixed, a large force at the time of a collision is absorbed by the elastic sheet 107. As a result, the bending moment instantaneously applied to the insulating member 103 connecting the arc-extinguishing chamber second movable electrode 10 and the cylindrical electrode 105 at the time of a collision becomes much smaller than that in the past. FIG. 2 shows the bending moment applied to the insulating member 103 at the time of the collision between the closing resistance contact second movable electrode 102 and the cylindrical electrode 105 during the breaking operation of this embodiment and the conventional example, as a parameter of time. This is a graph shown as follows. From FIG. 2, it is clear that the bending moment applied to the insulating member 103 of this embodiment is much smaller than the conventional one, when compared with the bending moment applied to the conventional insulating member 103. Therefore, in this embodiment, large bending stress due to collision is not generated in the insulating member 103, so problems such as deformation or destruction of the insulating member 103 that have conventionally occurred are solved, and the natural frequency can be easily adjusted. A tall spring 106 can be installed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but includes, for example, an elastic member fixed to the abutting portion between the stopper of the cylindrical electrode and the engaging portion of the second movable electrode of the closing resistance contact. Instead of being fixed to the cylindrical electrode side, it is also possible to fix it to the second movable electrode side of the making resistance contact, and furthermore, it is also possible to fix it to both sides. Further, the material of the elastic member is not limited to tetrafluoroethylene resin, and can be freely selected.

[0027]

[Effects of the Invention] As described above, in the present invention,
By making it possible to reliably maintain the function of the closing resistance contact during the closing operation and reliably prevent deformation or destruction of the member during the closing operation, a highly reliable, large-capacity, single-point-off, double A puffer type gas circuit breaker with a motion type closing resistance contact can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of a puffer-type gas circuit breaker with a double-motion closing resistance contact according to the present invention.

FIG. 2 is a graph showing the bending moment applied to the insulating member of the puffer type gas circuit breaker with closing resistance contact shown in FIGS. 1 and 3, using time as a parameter.

FIG. 3 is a sectional view showing an example of a conventional double-motion type puffer-type gas circuit breaker with a closing resistance contact.

FIG. 4 is a time chart showing a desirable operation in a puffer-type gas circuit breaker with a double-motion closing resistance contact.

FIG. 5 is a time chart showing an inconvenient operation that is likely to occur when the natural frequency of the spring system is low in a double motion type puffer type gas circuit breaker with a closing resistance contact.

[Fig. 6] Cross-sectional view showing the closed state of an example of a conventional double-motion puffer type gas circuit breaker

FIG. 7 is a sectional view showing the puffer type gas circuit breaker in FIG. 6 in a cut-off state.

[Explanation of symbols]

1 Arc extinguishing chamber first movable electrode 2
Puffer cylinder 3 Insulating nozzle 4 Movable current-carrying contact 5 Operating rod 6 Insulating rod 7 Insulating tube 8 Puffer piston 9 Puffer chamber 10 Arcing chamber second movable electrode 11 Current-carrying cylinder 12 Movable current-carrying contact 13 Second movable shield 14 Current-carrying conductor 15 Insulating rod 16 Link mechanism 16a Link 16b First connecting rod 16c Second connecting rod 16d Link support portion 16e Fulcrum 101 Closing resistance contact first movable electrode 102
Closing resistance contact second movable electrode 102a Engaging portion 103 Insulating member 104 Closing resistor 105 Cylindrical electrode 105a Stopper 106 Spring

Claims (1)

[Claims] 1. A first movable electrode in the arc-extinguishing chamber and a second movable electrode in the arc-extinguishing chamber are disposed facing each other so as to be able to freely approach and separate from each other in a container filled with arc-extinguishing gas, and the first movable electrode in the arc-extinguishing chamber and a second movable electrode in the arc-extinguishing chamber, each of which is driven to the opposite side by a single drive device, and a puffer cylinder that moves together with the first movable electrode in the arc-extinguishing chamber, and a puffer piston that slides within the puffer cylinder. The arc-extinguishing gas in the puffer cylinder is compressed, and this compressed gas is ejected as a gas stream from an insulated nozzle fixed to the puffer cylinder, thereby discharging the arc-extinguishing chamber first movable electrode and the arc-extinguishing chamber first movable electrode. an arc extinguishing chamber that extinguishes an arc generated between two movable electrodes, a closing resistance contact first movable electrode fixed to the first movable electrode of the arc extinguishing chamber; and a second movable electrode of the arc extinguishing chamber. a making resistance contact consisting of an electrode, an insulating member, and a second movable electrode of the making resistance contact connected via a wiping mechanism for obtaining a wipe of the making resistance contact; the second movable electrode of the making resistance contact and the arc extinguishing chamber; In a puffer-type gas circuit breaker with a double-motion closing resistance contact, which includes a closing resistance electrically connected between two movable electrodes, the wipe mechanism connects the second movable electrode of the arc extinguishing chamber and an insulating member. A cylindrical electrode connected through the cylindrical electrode, a stopper provided at one end of the cylindrical electrode, a spring housed in the cylindrical electrode, and a closing resistance contact provided on the second movable electrode, and a stopper provided at one end of the cylindrical electrode. The closing resistance contact second movable electrode also has an engaging part housed in a cylindrical electrode, and during a breaking operation, the engaging part is pressed by the stored force of the spring to form the cylindrical electrode. The second movable electrode of the cylindrical electrode is arranged to abut against and be positioned, and an elastic member is fixed to the abutment portion between the stopper of the cylindrical electrode and the engaging portion of the second movable electrode of the making resistance contact. A puffer type gas circuit breaker with a closing resistance contact.