JP2517265Y2 - Gas circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a gas circuit breaker installed in a substation or a switching station of a power system, and particularly in the case of large current interruption. In the middle of opening, there is a means to extinguish the gas pressure by using the thermal energy of the arc in the pressure boosting chamber, and in the case of a small current interruption, a means to extinguish the arc by rotating it by electromagnetic force. The present invention relates to an arc extinguishing chamber of a gas circuit breaker.

(Prior Art) A gas circuit breaker, which is a part of substation equipment, is required to be downsized and have low driving force while the gas insulation equipment is required to be small and highly reliable. By the way, most arc-extinguishing chambers of gas circuit breakers that have been used up to now are of the puffer type. However, although the puffer-type gas circuit breaker can be downsized, it is necessary to compress the puffer cylinder, so that a driving force that overcomes the reaction force due to the pressure increase in the puffer chamber is required. Therefore, a driving force for compressing the puffer cylinder and a driving force for overcoming the reaction force due to the pressure increase are required, and it is impossible to reduce the driving force as much as possible.

Therefore, we have developed a self-extinguishing gas circuit breaker that uses the arc energy generated when the circuit breaker shuts down to raise the pressure in the booster chamber and uses this pressure to blow the arc generated between the arc electrodes. Has been done.

FIG. 3 shows a typical example of the self-extinguishing system disclosed in Japanese Utility Model Publication No. 48-58948. The configuration of this gas circuit breaker will be described below with reference to FIGS. 3 and 4.

FIG. 3 shows a closed state of the gas circuit breaker, in which one end of a cylinder 43 is fixed to a metallic end plate 42 surrounded by an insulating outer cylinder 41. The cylinder 43 has a catch 44 on the inner peripheral wall surface in the vicinity of the other end, and a nozzle holding portion 45 is formed and opened at the other end. An insulating nozzle 46 is fixed to the nozzle holder 45. A movable electrode 47, an intermediate electrode 48, and a fixed electrode 51 are installed on the axes of the insulating nozzle 46 and the cylinder 43. The fixed electrode 51 has a tubular shape in its electrical coupling portion with the intermediate electrode 48, and has a metallic end plate 42.
It is stuck to. Intermediate electrode 48 has multiple gas vents
An insulating flat disk-shaped support plate 49 having 49a is installed so that it can reciprocate in the cylinder 43.
A spring 50 is inserted between the metallic end plate 42 and the metallic end plate 42 to form a piston. The intermediate electrode 48 is a fixed electrode.
51 and the movable electrode 47 are electrically coupled, and the movable electrode 47 has a tubular shape at the coupling portion with the intermediate electrode 48 like the fixed electrode 51. Furthermore, the intermediate electrode 48 has a bilaterally symmetrical structure, that is, it has rod-shaped arcing portions 52 and 53 to be inserted into the tubular electric coupling portions of the movable electrode 47 and the fixed electrode 51, and the arcing portions 52 and 53. Are inserted into the movable electrode 47 and the fixed electrode 51, respectively, the grooves 54 and 55 provided at the bases of the arcing portions 52 and 53 of the intermediate electrode 48 for electrically coupling the movable electrode 47 and the fixed electrode 51. Further, a plurality of finger-shaped contacts 57, 58 having finger-shaped contact portions 56 are inserted and attached so as to contact the outer peripheral surfaces of the movable electrode 47 and the fixed electrode 51, respectively. In order to bring the finger-like contacts 57 and 58 into close contact with the outer peripheral surfaces of the movable electrode 47 and the fixed electrode 51, pressing springs 59 and 60 are inserted between support tubes 61 and 62 forming a part of the intermediate electrode 48. . This support tube 62
Forms a gas discharge passage between the nozzle 46 and the support cylinder 62 as described later.

FIG. 3 shows the closed state of the gas circuit breaker. When the gas circuit breaker is in the state shown in FIG.
The support plate 49 is pressed by and compresses the spring 50 to stand still.

The atmosphere inside and outside the cylinder 43 in such a state is
The same pressure. However, when the opening operation is started as shown in FIG. 4 for some reason, the intermediate electrode 48 starts moving in the cylinder 43 following the movement of the movable electrode 47 by the spring force of the spring 50. , Arcing part 52 and fixed electrode
An arc 63 is generated between 51 and this arc heat
The gas in the vicinity of 63 expands and the pressure of the gas in the vicinity increases. On the other hand, the support plate 49 moves to the catch 44 on the inner wall surface of the cylinder 43 and stops there. As a result, the gap with the movable electrode 47 is opened, and the arc 64 is generated during this period.
Since the gap 65 between the movable electrode 47 and the nozzle 46 is extremely small,
The amount of gas blown out until the movable electrode 47 comes out of the nozzle 46 is small, and the pressure increase value in the cylinder 43 by the arc 63 can be increased to a sufficient value as compared with the outside of the cylinder 43.

When the movable electrode 47 goes out of the nozzle 46, the gas in the nozzle 46 and the cylinder 43 has a high pressure, so that the gas from the space passes through the gas vent 49a and passes through the space to form the nozzle 46 and the support cylinder 62. After passing through the gas discharge passage 66 and being blown to the arc 64, the arc 64 extinguishes and the interruption is completed.

(Problems to be solved by the invention) By the way, in a gas circuit breaker that extinguishes heat using the thermal energy of the arc as described above, in the case of a small current,
There is a possibility that the pressure rise in the booster chamber 67 is small and the blasting force against the arc is insufficient, making it impossible to shut off. Further, even when a large current is cut off, inside the booster chamber 67, metal vapor of the electrodes is generated due to the arc between the arc electrodes, and there is a possibility that the breaking performance may not be obtained due to the influence.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to combine a means using electromagnetic force and a means using arc energy, from a small current to a large current. It is an object of the present invention to provide a gas circuit breaker having a highly reliable shutoff performance that enables shutoff of a gas.

[Means for Solving the Problem] (Means for Solving the Problems) A gas circuit breaker of the present invention is provided with a movable electrode and a fixed electrode in a blocking chamber filled with an arc-extinguishing gas, and a movable arc that moves together with the movable electrode. An electrode, an intermediate arc first electrode that can come in contact with and separate from the movable arc electrode, an intermediate arc second electrode that moves together with the intermediate arc first electrode, and a coil arc electrode that can come into contact with and separate from the intermediate arc second electrode In the gas circuit breaker in which the intermediate arc first electrode and the intermediate arc second electrode are fixed in opposite directions to each other, a partition wall having an opening formed around the fixed fixing portion is formed. An insulating nozzle is provided inside the partition wall, and an insulating nozzle is disposed on the side of the intermediate arc first electrode of the partition wall.
A cylindrical cylinder having an electrode side as a pressure-increasing chamber is arranged between the movable electrode and the fixed electrode so as to be able to come into contact with and separate from the movable electrode, and an external insulating support portion supported and fixed to the fixed electrode of the cylinder and the interruption chamber. Is movably supported by a predetermined range, a spring is arranged between the external insulating support and the cylinder in the axial direction, and the coil arc electrode is arranged in the boost chamber.

(Operation) Along with the opening operation, the pressure of the gas in the boosting chamber is increased by the arc generated between the second electrode of the intermediate arc and the coil arc electrode, and this high pressure gas is applied between the movable arc electrode and the first electrode of the intermediate arc. The generated arc is blown to extinguish, and in the case of a small current interruption, the arc generated between the second electrode of the intermediate arc and the coil arc electrode is rotated by the electromagnetic force of the coil to extinguish.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing an essential part of an embodiment of the present invention.

In the figure, reference numeral 1 denotes a movable electrode, which is provided with a movable arc electrode 2 on the center side thereof, and is reciprocally moved in the axial direction by a driving device (not shown) to form an intermediate arc first electrode 4 provided on the center side of the cylinder 3. It can be moved in and out of. Cylinder 3
Is supported by a cylindrical outer insulating support portion 5 so as to be able to advance and retreat with a predetermined stroke, and a partition wall 6 is provided inside the partition wall 6, and on the movable electrode 1 side of the partition wall 6, the above-described intermediate arc first
In addition to fixing the electrode 4, an insulating nozzle 7 is fixed to the outside of the electrode 4 via an intermediate energizing contactor 8, and an intermediate arc second electrode 9 is fixed to the other side of the partition wall 6 on the center side.
The pressurizing chamber 10 is formed. The booster chamber 10 includes an opening 11 provided in the partition wall 6, an insulating nozzle 7 and an intermediate arc first electrode 4
An insulating nozzle throat through a passage 12 formed by
It communicates with 13.

Further, the cylinder 3 is provided with a stopper 14 on the outer peripheral surface thereof, and the stopper 14 abuts on the projecting portions 15 and 16 provided on the inner peripheral side of the outer insulating support portion 5 at a predetermined interval, whereby the stroke of the cylinder 3 is increased. Is regulated. In addition,
A stopper member 17 is provided inside the protrusion 15.

On the other hand, the cylinder 3 is capable of coming into contact with and separating from the current-carrying contactor 19 of the fixed electrode 18, and has a cylindrical insulating sliding portion 20 fixed to the end face (the side opposite to the intermediate current-carrying contactor 8). The insulating sliding portion 20 is configured to be slidable on the inner insulating support portion 21. The inner insulating support portion 21 is formed in a cylindrical shape,
A slide guide surface 22 of the above-mentioned insulating slide portion 20 is provided on the outer peripheral surface, and a step portion 23 is provided at an end of the slide guide surface 22.

A spring 24 is inserted between the step portion 23 and the end surface of the insulating sliding portion 20. This spring 24 is charged in the closed state.

In addition, inside the booster chamber 10 described above, a coil is provided on the center side.
25 is fixed to a fixing portion 26 having conductivity. A coil arc electrode 27, which is freely movable into and out of contact with the second intermediate arc electrode 9, is fixed to the end of the coil 25.

The outer insulating support 5, fixed electrode 18, inner insulating support 2
1 and the fixed portion 26 are provided in a shutoff chamber 28 filled with an arc extinguishing gas, and are attached to an end plate (not shown) made of a conductive material.

Next, the operation of the embodiment configured as described above will be described. First, as shown in FIG. 1, the current path in the closed state is the movable electrode 1, the intermediate energizing contact 8, the cylinder 3, the energizing contact 19, and the fixed electrode 18. Next, the opening operation in the case of receiving the interruption command is driven by a driving device (not shown), and the movable arc electrode 2 is pulled upward as shown in FIG. At the same time, the stored spring 24 pushes the insulating sliding portion 20 and the cylinder 3 and moves in the same direction as the movable arc electrode 2. Since the intermediate arc second electrode 9 attached to the cylinder 3 also moves in the same direction, the current contactor
19 and the cylinder 3 are dissociated, and the current is commutated from the cylinder 3 to the second intermediate arc electrode 9, the coil 25, and the coil arc electrode 27. When the intermediate arc second electrode 9 and the coil arc electrode 27 are dissociated, an arc 30 shown in the figure is generated therebetween. On the other hand, the cylinder 3 is stopped by the stopper 14 and the stopper member 17 attached to the cylinder 3, but the movable arc electrode 2 is moved to the driving device side by the driving device. Therefore, the movable arc electrode 2 and the intermediate arc first electrode 4 are dissociated to generate the arc 31 shown in FIG. In the case of large current interruption, after the movable arc electrode 2 passes through the insulating nozzle throat 13, the pressure increased by being heated by the energy of the arc 30 is increased from the boost chamber 10 through the opening 11 and the passage 12 to the arc 31.
Be sprayed on. However, in case of small current interruption,
The energy of the arc 30 does not sufficiently increase the pressure in the pressure-raising chamber 10, so that the arc 31 may not be blown out. Then, the arc 30 is rotationally driven and extinguished by the electromagnetic force generated by the current flowing through the coil 21.

As described above, in the present embodiment, when a large current is interrupted, the arcs generated between the movable arc electrode and the intermediate arc first electrode and between the intermediate arc second electrode and the coil arc electrode during the opening operation are First, the energy of the arc generated between the second electrode of the intermediate arc and the coil arc electrode increases the pressure in the pressure boosting chamber to blow off the arc generated between the movable arc electrode and the intermediate arc electrode. In the boost chamber, an arc current flows through the coil and an electromagnetic force is generated, which causes the arc to rotate on the surface of the coil arc electrode, causing the arc to stick to the surface of the coil arc electrode and melt the surface of the electrode. Since the generation of metal vapor in the booster chamber is suppressed, the gas blown to the arc generated between the movable arc electrode and the intermediate arc first electrode is also cut off as described in Japanese Utility Model Publication No. Sho 48-58948. The breaking performance is better than that of the container.

In the case of a small current interruption, the arc energy generated between the second electrode of the intermediate arc and the coil arc electrode is:
Since it is difficult to blow off the arc generated between the movable arc electrode and the intermediate arc first electrode, the electromagnetic force generated by the arc current generated between the intermediate arc second electrode and the coil arc electrode flowing through the coil is It can be used to rotate the arc to extinguish it.

As described above, according to the present embodiment, it is possible to provide a compact gas circuit breaker capable of interrupting from a small current to a large current and having a small driving force and improved reliability. Have. That is, in the present embodiment, since the cylinder is used as an intermediate electrode for energization that electrically connects the movable electrode and the fixed electrode, and the spring is arranged between the cylinder and the external insulating support portion in the axial direction, the pressure of the pressure chamber is increased. The cylinder can be moved by the spring without being affected by the rise.

Further, in this embodiment, the pressure boosting chamber and the nozzle portion are partitioned by a partition wall, and an opening is formed in the partition wall to communicate with each other. It is possible to cut off a large current.

Further, in this embodiment, since the insulating nozzle is attached to the cylinder and this cylinder is designated by the external insulating support portion, the supporting member for fixing the nozzle is unnecessary.

[Effects of the Invention] As described above, according to the present invention, in a gas circuit breaker that generates an arc in a booster chamber to increase the pressure, a movable arc electrode and an intermediate arc first electrode, and an intermediate arc second electrode and a coil. An arc can be generated between the arc electrodes, and the generated arc can be rotationally extinguished within the boost chamber by the electromagnetic force of the arc current. This allows
The generation of metal vapor improves the large current interruption performance compared with the conventional self-extinguishing method, and the small current interruption performance extinguishes the insufficient pressure rise in the booster chamber by rotating the arc by electromagnetic force to extinguish the arc. Therefore, it is possible to improve the small current interrupting performance, which was a drawback of the self-extinguishing method, and to provide a compact gas circuit breaker with a small driving force and improved reliability that can interrupt from a small current to a large current. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of one embodiment of the present invention, FIG. 2 is an explanatory view showing an operation of one embodiment of the present invention, and FIG. 3 is a sectional view showing an essential part of a conventional gas circuit breaker. 4 and 5 are explanatory views showing the operation of the conventional gas circuit breaker. DESCRIPTION OF SYMBOLS 1 ... Movable electrode, 2 ... Movable arc electrode, 3 ... Cylinder, 4 ... Intermediate arc first electrode, 5 ... Outer insulating support part, 7 ... Insulation nozzle, 9 ... Intermediate arc second electrode, 10 ... Boosting chamber, 18 ... Fixed electrode, 24 ... Spring, 25 ... Coil 27 ... Coil arc electrode, 28 ... Break chamber

Continued Front Page (72) Hiromichi Kono 2-1 Hiroki Kono, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Inside the Hama-Kawasaki Plant, Toshiba Corporation (56) References JP 61-135017 (JP, A) JP-B 37- 8010 (JP, B1)

Claims (1)

(57) [Scope of utility model registration request] 1. A movable arc electrode provided with a movable electrode and a fixed electrode in an interruption chamber filled with an arc-extinguishing gas, and a movable arc electrode that moves together with the movable electrode, and an intermediate arc first electrode that can be brought into contact with and separated from the movable arc electrode. A gas circuit breaker in which an intermediate arc second electrode that moves together with the intermediate arc first electrode and a coil arc electrode that can come in contact with and separate from the intermediate arc second electrode are arranged in series. And the intermediate arc second electrode are fixed to each other in opposite directions, and a partition wall having an opening formed around the fixed fixed portion is provided inside, and the partition wall is provided on the intermediate arc first electrode side. A cylindrical cylinder, in which an insulating nozzle is disposed and whose second arc electrode second electrode side is a pressure chamber, is disposed so as to be contactable and separable between the movable electrode and the fixed electrode, and the fixed electrode side of the cylinder is disposed. The interception And supported so as to be a predetermined range moved by the external insulating support portion which is supported by and fixed to the chamber, the spring is disposed axially between the opposing portion between the cylinder and the outer insulating support,
A gas circuit breaker, wherein the coil arc electrode is arranged in the boost chamber.