JP2964473B2 - Breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker in which a movable contact is inserted into and released from a fixed contact in an insulating gas, and more particularly to a gas circuit breaker having an improved drive structure for a movable contact.

[0002]

BACKGROUND Conventionally, there is one shown in FIG. 5 as a gas circuit breaker of this kind. FIG. 6 is a schematic sectional view for explaining the operation of the movable contact portion of the conventional gas circuit breaker. In the figure, the conventional gas circuit breaker encloses a sulfur hexafluoride gas (hereinafter referred to as SF6 gas) in a case body 3 of a closed container,
A power supply-side bushing 4 and a load-side bushing 5 are disposed through two opposing wall surfaces of the case body 3. The fixed contact portion 1 is attached to the inner end of the power-supply-side bushing 4, and the through-hole is provided. Load side bushing 5
The movable contact portion 2 is attached to the inner end portion of the base member via a guide rod 200. The fixed contact portion 1 is mounted in a state where a plurality of fixed contacts 11 are arranged in an annular shape, and the plurality of fixed contacts 11 are each urged by a garter spring 12 to have an annular inward elastic force. The structure is a tulip (or plug) contact structure.

The movable contact portion 2 is provided with the guide rod 200
The hollow cylindrical body 210 is fitted to the hollow cylindrical body 210.
The movable contact 21 is disposed at one end of the hollow cylindrical body 210, and the current collecting contact 201 is disposed at the other end of the hollow cylindrical body 210. The current collecting contact 201 slidably contacts the outer peripheral surface of the guide rod 200. Is a configuration for linear movement. The linear movement of the movable contact 21 is such that the hollow cylindrical body 210 that engages with the tip of the insulating arm 23 that rotates (in the direction of the arrow F1 or G1 in the drawing) with the rotation of the main shaft 6 moves along the guide rod 200. It moves in a straight line (in the direction of arrow F2 or G2 in the figure).

FIG. 6 is an explanatory view of an assembled state of a conventional arc extinguishing device for a circuit breaker. In the figure, the arc extinguishing device of the circuit breaker is formed in a substantially cylindrical shape, an arc runner 82 for moving an arc discharge position from the inner surface of the cylindrical shape, a coil bobbin 81a for supporting the arc runner 82 at a tip portion of the cylindrical shape, A drive coil 81 that is disposed on the outer periphery of the cylindrical shape of the coil bobbin 81a and generates a magnetic field in the arc runner 82, and an insulating portion 83 that is formed of an insulating cylindrical body and supports the coil bobbin 81a at an end of the cylindrical body. And a female screw 83c formed inside, and a flange mounting portion 83a that supports the insulator 83 at the end.

In order to assemble the conventional arc-extinguishing device for a circuit breaker to the fixed contact portion 1, it is assumed that the fixed contact portion 1 penetrates the side wall of the case body 3 and that the power supply side bushing 4 is hermetically mounted. Screwed to the power conductor. A male screw 1a is formed on the outer periphery of the base of the fixed contact portion 1. A fixed contact base 14 protruding from the base is urged by a garter spring 12 with an elastic force such that the fixed contact 11 contracts inward. Installed. The nut 83j is screwed into the male screw 1a of the fixed contact portion 1, and the female screw 83c of the flange mounting portion 83a is screwed into the male screw 1a. By screwing this nut 83j and the female screw 83c of the flange attachment portion 83a into the male screw 1a,
Similarly to the double nut fixing, the screw thread of the male screw 1a and the screw thread of the male screw 83c are in close contact with each other. Become.

[0006]

Since the conventional circuit breaker is configured as described above, in the gas circuit breaker shown in FIG. 5 , the current collecting contact 201 of the movable contact portion 2 has a guide rod. There is a problem that the operation speed becomes slow due to the contact resistance of the sliding movement of the 200 in a straight line, and the closing time and the opening time become long.

Further, since the arc extinguishing device of the circuit breaker as shown in FIG. 6 is configured as described above, the mounting position of the arc runner 82 with respect to the fixed contact 11 of the fixed contact portion 1 is determined by the nut 83 j and the flange mounting. Female screw 83 of part 83a
Adjustment must be made depending on the screwing state with c, and there is a problem that precise positioning is difficult.

Further, each of the conventional circuit breakers has an arc runner 82 and a current transformer CT in a narrow space of the case body 3.
(Or the zero-phase current transformer ZCT), the fixed contact 11, the movable contact 21 and the like must be precisely mounted with independent positioning. These individual and precise mounting operations deteriorate the workability in manufacturing the device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a circuit breaker in which closing and opening operations are performed smoothly and at a high speed, and in which device manufacturing is simplified and speeded up. .

[0010]

The circuit breaker according to the present invention comprises:
A tulip-shaped fixed contact that is housed in the case body and fixed to the inner wall of the case body, and is formed by arranging a plurality of fixed contacts at an end thereof in an annular shape with an inward elastic force being applied. A cylindrical movable contact is formed at the end of an insulating arm housed in the case main body and rotatably supported on the main shaft as a fulcrum, and the insulating arm is turned with the rotation of the main shaft. A movable contact portion that moves and a cylindrical movable contact is inserted into and released from the annular fixed contact, and an arc runner that is disposed on an outer front surface of the fixed contact portion and is formed of a conductive material. A base-side screw thread is formed on a base portion of the fixed contact portion, and the fixed contact is disposed with reference to a side end step portion of the base-side screw thread, and a mounting side of the arc runner is provided. At the end, a thread on the mounting side is formed, and Forming a positioning protrusion on the rear side of the child mountain, positioning protrusions on the side edge step portion screwed to said base side thread and the mounting screw thread is one that fastening to abut.

Further, the circuit breaker according to the present invention is attached to the periphery of the inside of the case main body of the bushing portion which is attached through the side surface of the case main body as required, and is changed to a hollow frame made of an insulating material. A current transformer mounting case for accommodating the current transformer and mounting to the inner surface of the case body with a mounting flange protruding laterally from the base of the frame body.

Further, the circuit breaker according to the present invention mounts the movable contact of the movable contact portion in a circumferential direction around the mounting position as necessary .

[0013]

[0014]

According to the present invention, a fixed contact portion composed of a fixed contact and a movable contact portion composed of a movable contact are housed in a case main body, and the movable contact portion is rotated about a main shaft as a fulcrum to fix the fixed contact. The movable contact is turned on or off
This fixed contact portion is disposed with reference to the side end step portion of the base side screw thread, and the positioning projection of the arc runner abutting on this side end step portion is formed on the back side of the mounting side screw thread. It is possible to speed up each operation of loading and unloading in the capacity electric wire, and simply screw the mounting side screw thread to the base side screw thread and tighten it until the positioning protrusion contacts the side end step. The positional relationship between the set fixed contact portion and the arc runner can be accurately and simply positioned and mounted.

In the present invention, the current transformer is housed in a hollow frame portion made of an insulating material, and a mounting flange portion protruding laterally from a base of the hollow frame portion is provided on the inner surface of the case body. Since the current transformer is mounted, the current transformer can be mounted easily and quickly even in a narrow space of the circuit breaker.

Further, in the present invention, since the movable contact of the movable contact portion is mounted so as to be rotatable in the circumferential direction around the mounting position, the mounting accuracy between the fixed contact portion and the movable contact portion is adjusted. And the sliding position of the movable contact with respect to the fixed contact can be made uniform without bias, so that the work of mounting the movable contact can be simplified and speeded up, and further, the local wear of the contact surface can be reduced. Can be suppressed as much as possible.

[0017]

[0018]

[0019]

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (One Embodiment of the Present Invention) Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 is an explanatory diagram of the internal configuration of the gas circuit breaker according to the present embodiment, FIG. 2 is an explanatory diagram of an assembled state of an arc extinguishing device in the gas circuit breaker shown in FIG. 1, and FIG. 3 is a gas interrupter shown in FIG. FIG . 4 is an external perspective view of a current transformer mounting case in a heat sink, and FIG.
It is the elements on larger scale of a projection part and a groove part .

In each of the drawings, the gas circuit breaker according to the present embodiment includes a power supply side bushing 4 and a load side bushing which are disposed in a sealed state through respective opposed wall surfaces of a closed vessel filled with SF6 gas. (Not shown), and the case body 3 of the power-side bushing 4
A fixed contact portion 1 connected to and attached to the power supply line 40 at an end in the inside, and a main shaft 6 disposed on the side (lower side) of the fixed contact portion 1, and a flexible conductor ( A movable contact portion 2 connected to a load line (not shown) of the load side bushing via a not-shown), and an arc extinguishing device arranged to surround the fixed contact portion 1 from the outer periphery to the front. 8 and the current transformer CT (or the zero-phase current transformer Z) which is fitted through the current transformer mounting case 9 to the inner wall of the case body 3 by fitting the power supply side bushing 4 or the load side bushing.
CT).

The fixed contact portion 1 includes a power source side bushing 4
A fixed contact base 14 formed of a conductive material screwed to a power supply side conductor 41 connected to the power supply line 40 disposed therein, and protruding from an outer peripheral end of the fixed contact base 14. A plurality of stationary contacts 11 arranged in an annular tulip shape, and a center projecting from the distal end surface of the stationary contact base 14 and screwed into the annular of the stationary contacts 11 arranged in the annular shape. The configuration includes a guide unit 13. The plurality of fixed contacts 11 are configured to be mounted in a state where an elastic force converging to the inside of the ring is urged by a garter spring 12 mounted on the outer peripheral portion of the base. The movable contact portion 2 has one end of a substantially L-shaped arm body supported by the main shaft 6, and an insulating arm 23 that rotates with the rotation of the main shaft 6, and another arm body of the insulating arm 23. A support rod 22 fitted into a mounting hole 23a formed at the end, a movable contact 21 attached to a tip end of the support rod 22 and formed of a cylindrical conductive material having an open end. It is a structure provided with.

The arc extinguishing device 8 includes an arc runner 82, a coil bobbin 81a, a driving coil 81, an insulating portion 83, and a flange mounting portion 83a in common with the arc extinguishing device 8 of the conventional circuit breaker shown in FIG. These are similarly assembled and configured so that the structure of the flange mounting portion 83a is different, and the structure of mounting the fixed contact portion 1 to the male screw 1a is different.

The flange mounting portion 83a is provided as shown in FIG.
As shown in (A), a female screw 8 formed to have a predetermined width inward from one side end of a flange main body formed of a cylindrical tubular body.
3d, a positioning projection 83e projecting in a hook-like manner at a predetermined position inward from the other end of the flange body, and a flange 83f projecting laterally around the outer periphery of the positioning projection 83e.
And an insulating portion mounting screw 83g for inserting the insulating portion 83 through the mounting hole of the flange portion 83f. A groove 83h having a concave cross section is formed between the female screw 83d and the positioning projection 83e.

The current transformer mounting case 9 includes a frame 91 formed of an insulator having a substantially U-shaped cross section in an annular shape, and a shape correction protruding in two rows on the inner surface of the U-shaped frame 91. Part 9
6 , a mounting flange 92 protruding laterally from both side bases of the frame 91, and a reinforcing rib 93 erected from the mounting flange 92 along the side wall of the frame 91.
A mounting screw hole 92a for mounting the current transformer mounting case 9 on the case body 3 is formed in the mounting flange 92, and a binding hole 93a for fixing various control wirings is formed in the reinforcing rib 93. It is. Further, a lead-out portion 94 for projecting the wiring by partially projecting to the side of the frame body 91 is formed, and an opening 95 is formed at a side end portion of the lead-out portion 94. The opening 95 is used for leading out a lead wire connected to a winding wound around a core forming the current transformer CT.

In the current transformer mounting case 90, the frame body 91 is formed of a hollow rectangular insulator so that the R, S, and T phases of the power supply-side bushing 4 or the load-side bushing penetrate therethrough. Will be arranged. Next, the assembling and manufacturing operations of the gas circuit breaker according to the present embodiment based on the above-described configuration, and each operation of closing and opening after completion are described.

First, the arc extinguishing device 8 and the current transformer CT (or the zero-phase current transformer ZC) are provided in the case main body 3 of the gas circuit breaker of this embodiment.
The mounting operation of T) will be described. It is assumed that the arc extinguishing device 8 is completed by assembling the arc runner 82, the coil bobbin 81a, the drive coil 81, the insulating portion 83, and the flange attaching portion 83a in advance.

The operation of assembling the completed arc extinguishing device 8 to the fixed contact portion 1 is as shown in FIG. 2 and FIG.
The arc extinguishing device 8 faces the fixed contact portion 1 in the direction of arrow A.
To the male screw 1a of the fixed contact portion 1 and the arc extinguishing device 8
The female screw 83d is screwed. Screwing this female screw 83d
Performs screwing to fastening completely to the positioning protrusion 83e of the flange mounting portion 83a to the solid male screw 1a of the constant contact portion 1 as shown in FIG. 4 (B) is in contact. Thus, the positioning projection 83 is provided on the side end step 1b of the male screw 1a.
e is screwed until it abuts, thereby precisely positioning the arc-resistant contact piece of the fixed contact 11 in the fixed contact portion 1 and the orifice shape of the runner body 82a in the arc runner 82 by simply turning the screwing operation. Can only do so. That is, the arrangement position of the fixed contact portion 1 with respect to the fixed contact 11 is designed and manufactured as an arrangement distance L2 with reference to the side end step portion 1b of the male screw 1a .
(See FIG. 4A), and the runner body 82a
The inner surface of the orifice shape is located at the flange mounting portion 83a.
Distance L based on inner end 83i of positioning projection 83e
Designed and manufactured as 1. The design and
From the relationship between the produced installation distance L2 and the distance L1,
The reference side end step 1b and the inside end 83i are in contact with each other.
Only tightened until (see FIG. 4 (B)), so that the high-precision assembly of the previous SL extinguishing device of the circuit breaker of the present embodiment with respect to the fixed contact part 1 can simplify and easily performed.

Further, the inner end of the positioning projection 83e of the flange attachment portion 83a is provided at the side end step portion 1b of the male screw 1a.
The screws are screwed so as to be completely tightened until they come into contact with the portion 83i (see FIG. 4B). They come into close contact with each other, and also serve as a current conducting surface to the drive coil 81 that performs magnetic blowing.

Next, the current transformer CT (or the zero-phase current transformer ZC)
T) is mounted on the outer periphery of each of the R-phase and T-phase bushings of the power supply-side bushing 4 and the load-side bushing (not shown).
Is attached to the case body 3 by being fixed thereto. When assembling the current transformer CT, a lead wire connected to the winding on the outer periphery of the core is pulled out from the opening 95, and this lead wire and other wires such as control wires are inserted into the binding holes 93a and supported. I do. Further, in the case of the zero-phase current transformer ZCT, it is mounted so as to surround the bushing of each phase, and the lead wire is processed similarly to the current transformer CT. If the current transformer mounting case 9 (or 90) is installed to the case body 3, the two rows of projections of a shape correcting unit 9 6 formed on the inner wall of the current transformer mounting case 9 (or 90) Thus, the core of the accommodated current transformer CT (or the zero-phase current transformer ZCT) can be properly pressed and locked without causing distortion.

As described above, the current transformer CT and the zero-phase current transformer ZCT are mounted on the outer periphery of the power supply side bushing 4 or the load side bushing (not shown) in the case main body 3 by the current transformer mounting cases 9 and 90. In this case, the current transformer CT is installed in the case body 3 in which accessories are extremely narrow and complicated.
In addition, the zero-phase current transformer ZCT can be quickly and reliably mounted, and workability can be improved. Further, in the above-described embodiment, the current transformer CT or the zero-phase current transformer ZCT is dispersed and arranged at different positions. However, the current transformer mounting case 9 is formed in the central opening area of the current transformer mounting case 90. It can also be arranged to be stored inside. In this case, the current transformer CT and the zero-phase current transformer ZCT can be collectively arranged in the same arrangement area in each bushing 4 (or 5).

[0032]

In the gas circuit breaker of each of the above embodiments, the movable contact 21 of the movable contact portion 2 is configured to be attached to the support rod 22.
It is also possible to adopt a configuration in which the device is rotatably mounted on the device. As described above, the movable contact 21 rotates in the circumferential direction of the support rod 22 with respect to the support rod 22, so that the sliding surface of the movable contact 21 with respect to the fixed contact 11 is not uniformly biased to a specific location. The movable contact 2 can be slid.
(1) Local wear can be suppressed as much as possible, and the reliability of contact can be improved. Further, also in the case where the movable contact 21 is fixed to the support rod 22 and further attached to the insulating arm 23 so as to rotate about the axis of the support rod 22, the movable contact 21 Local wear can be minimized and contact reliability can be improved.

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

As described above, according to the present invention, the fixed contact portion including the fixed contact and the movable contact portion including the movable contact are housed in the case body, and the movable contact portion is rotated around the main shaft as a fulcrum. The movable contact is thrown into or released from the fixed contact by moving the fixed contact, the fixed contact is disposed with reference to the side end step of the base side screw thread, and the arc runner contacting this side end step is provided. Since the positioning protrusion is formed on the back side of the mounting side thread, each operation of closing and opening in a large-capacity electric wire can be speeded up, and the mounting side thread is simply screwed into the base side thread. By simply tightening until the positioning protrusion comes into contact with the side end step, the positional relationship between the preset fixed contact portion and the arc runner can be accurately and simply positioned and mounted. In the present invention, the current transformer is housed in a hollow frame body made of an insulating material, and the current transformer is attached to the inner surface of the case body with a mounting flange projecting sideways from a base of the hollow frame body. Therefore, there is an effect that the current transformer can be easily and quickly mounted even in a narrow space of the circuit breaker.
Further, in the present invention, since the movable contact of the movable contact portion is mounted so as to be rotatable in the circumferential direction around the mounting position, the mounting accuracy between the fixed contact portion and the movable contact portion is precisely adjusted. In addition to this, the sliding position of the movable contact with respect to the fixed contact can be made uniform without deviation, so that the work of mounting the movable contact can be simplified and speeded up, and the local wear of the contact surface is suppressed as much as possible. It has the effect of being able to.

[Brief description of the drawings]

FIG. 1 is an internal configuration diagram of a gas circuit breaker according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of an assembled state of an arc extinguishing device in the gas circuit breaker shown in FIG.

FIG. 3 is an external perspective view of a current transformer mounting case in the gas circuit breaker shown in FIG.

FIG. 4 shows a female screw, a positioning protrusion, and a groove in FIG . 2;
It is an enlarged view.

FIG. 5 is a schematic sectional view showing the internal structure of a conventional gas circuit breaker.
You.

FIG. 6 is an assembly of an arc extinguishing device in a conventional gas circuit breaker.
It is an explanatory view of a state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fixed contact part 1a, 83c, 83d Male screw 1b side end step part 2 Movable contact part 3 Case main body 4 Power supply side bushing 6 Main shaft 8 Arc extinguishing device 8a, 71 Inside space 9, 90 Current transformer mounting case 11 Fixed contact Element 11b Arc-resistant contact piece 12 Garter spring 13 Center guide section 14 Fixed contact base 21 Movable contact 21a Arc-resistant contact piece 22 Support rod 23 Insulating arm 23a Mounting hole 31 Auxiliary plate 40 Power line 41 Power supply side conductor 80 Opening 81 Drive coil 81a Coil bobbin 82 Arcrunner 83 Insulation part 83a Flange attachment part 83c, 83d Female screw 83e Positioning projection part 83f Flange part 83g Insulation part attachment screw 83i Inner end part 91 Frame 92 Mounting flange part 92a Mounting screw hole 93 Reinforcement rib 93j Nut 94 deriving section 95 opening 96 shape correction unit 2 0 guide rods 201 collector contact 202 guide frame 202a through hole 210 hollow cylinder 230 driving arm

Claims (3)

(57) [Claims] 1. A plurality of fixed contacts are housed in a case body and fixed to an inner wall of the case body, and are formed by arranging a plurality of fixed contacts at an end thereof in an annular shape by applying an inward elastic force. A cylindrical movable contact is formed at an end of an insulated arm which is housed in the case main body and is rotatably supported on a main shaft as a fulcrum. A movable contact portion in which an insulating arm is rotated and a cylindrical movable contact is inserted into and released from the annular fixed contact; and a movable contact portion disposed on an outer front surface of the fixed contact portion and formed of a conductive material. An arc runner is provided, and a base-side screw thread is formed on a base part of the fixed contact part, and the fixed contact is disposed with reference to a side end step part of the base screw part, When the mounting side thread is formed at the mounting side end of the arcrunner To form a positioning protrusion on the rear side of the mounting side threads, fastening to the positioning projections on the side edge step portion screwed to said base side thread and the attachment side thread abuts A circuit breaker characterized by the above. 2. A breakers according to claim 1, attached to the case body inner periphery of the bushing mounted through the side surface of the case body, the hollow frame portion made of insulating material A circuit breaker, comprising a current transformer mounting case that houses a current transformer and is mounted on an inner side surface of a case body by a mounting flange protruding laterally from a base of the frame body. 3. The circuit breaker according to claim 1, wherein the movable contact of the movable contact portion is rotatably mounted in a circumferential direction around the mounting position.