JP3288556B2 - Switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device such as a switch, a circuit breaker, and a disconnector.

[0002]

2. Description of the Related Art Conventionally, first and second bushings are respectively provided on outer sides of a main body case of an opening and closing device opposite to each other, and the first and second bushings protrude into the main body case. First and second conductors are provided. A fixed electrode is provided on the first conductor, and a connection member is connected to the second conductor. The connecting member is supported in a state insulated from the main body case by an insulator provided on the inner side surface of the main body case. A movable electrode is rotatably supported by the connection member.

An opening / closing mechanism connected to the movable electrode and a power transformer electrically connected to the opening / closing mechanism are provided in the main body case. The power transformer is provided with an input lead wire, and the input lead wire is connected to the connection member. When power is supplied from the connecting member to the opening / closing mechanism via the power transformer, the opening / closing mechanism is driven, and the movable electrode is rotated by the driving of the opening / closing mechanism to be connected or separated from the fixed electrode. It has become.

[0004]

However, in the switchgear, an insulator for supporting the connecting member insulated from the main body case and an input for connecting the power transformer to the connecting member are provided. Since a lead wire must be provided, there is a problem that the configuration inside the main body case of the opening / closing device is complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to simplify the structure in a main body case of an opening / closing device. A second object of the present invention is to simplify the structure of the opening / closing device in the main body case in a switching device having a plurality of first and second conductors arranged in parallel.

A third object is to make it easier to attach an input terminal to a power transformer.

[0007]

To achieve the above object, according to the first aspect of the present invention, in particular, the power transformer is provided with an input terminal electrically connected to the connection member,
The connection member was supported by the input terminal.

[0008] In the invention according to claim 2, in particular, the power transformer is electrically connected to two connection members located on both outer sides of the connection members arranged in three phases. Two input terminals are provided, and the two input terminals support the two connection members located on the both outer sides, and a support terminal is provided at an intermediate position between the two input terminals. The connection member positioned at the center among the connection members arranged in parallel for three phases was supported.

According to the third aspect of the present invention, the input terminal is constituted by a connecting piece connected to a connecting member, and a mounting piece extending in a direction orthogonal to the connecting piece and mounted on a power transformer.

[0010]

According to the present invention, the connection member is supported by the input terminal provided in the power transformer.
Further, power for driving the opening / closing mechanism is supplied from the connecting member to the opening / closing mechanism via a power transformer by an input terminal.

According to the second aspect of the present invention, a connecting member is provided between the first and second conductors arranged in parallel for three phases corresponding to each phase of the distribution line, and each connecting member is provided. Of these, the two connecting members located on both outer sides are supported by two input terminals provided on the power transformer. The connection member located at the center is supported by a support terminal provided at an intermediate position between the two input terminals. or,
Electric power for driving the opening / closing mechanism is supplied to the opening / closing mechanism via a power transformer from two connection members located on both outer sides connected to the two input terminals.

According to the third aspect of the present invention, the first or second aspect is provided.
In addition to the effects of the invention described above, the connection piece of the input terminal is connected to the connection member, and the mounting piece extending in a direction orthogonal to the connection piece is mounted on the power transformer.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a gas switch used on a distribution line will be described below with reference to FIGS.

As shown in FIG. 1, a main case 12 of a switch 11 as a switch is formed in a box shape, and the main case 12 is filled with an insulating gas such as sulfur hexafluoride. On the outer surface of the main body case 12, three power supply side bushings 13 (only one is shown in FIG. 1) are juxtaposed.
The power supply side bushing 13 is provided with a power supply side conductor 14 as a first conductor extending into the main body case 12.
A fixed electrode 15 is provided at a tip end of the power supply-side conductor 14 located in the main body case 12. The power supply side conductor 14 is electrically connected to a power supply side distribution cable (not shown). A zero-phase current transformer 16 for detecting a zero-phase current is provided on the inner side surface of the main body case 12 so as to surround the three power-supply-side conductors 14. Is covered with an insulating cover 17 attached to the inner side surface of the cover. The cover 17 has three arc-extinguishing grids 18 for extinguishing an arc generated between the fixed electrode 15 and a movable electrode 25 to be described later when the switch 11 is opened and closed. Installed.

On the outer surface of the main body case 12 opposite to the three power supply side bushings 13, three load side bushings 19 (only one is shown in FIG. 1) are in the same direction as the direction in which the power supply side bushings 13 are juxtaposed. Are installed side by side. The load-side bushing 19 is provided with a load-side conductor 20 as a second conductor extending into the main body case 12.
0 is located in the main body case 12. A load-side distribution cable (not shown) is electrically connected to the load-side conductor 20. A current transformer 4 for detecting an overcurrent such as a short-circuit current is provided on the inner surface of the main body case 12.
0 is provided so as to surround the load-side conductor 20 for each phase. In the load-side conductor 20, a zero-phase voltage detector 22 for detecting a zero-phase voltage with a mounting bolt 21 is attached to a tip portion indicated by a broken line in FIG. The tip of the load-side conductor 20 is shown in FIG.
As shown in (a) to (c), the pair of connecting members 23 are sandwiched between the base ends, and both connecting members 23 are attached to the distal end of the load-side conductor 20 by fixing bolts 24.

The distal ends of the pair of connecting members 23 are bent so as to contact each other, and the distal ends thereof are connected to the pair of movable electrodes 25.
Are sandwiched between the base ends of the two. The distal ends of the two movable electrodes 25 are in contact with each other with the fixed electrode 15 of the power supply-side conductor 14 interposed therebetween. A pivot pin 26 penetrates through a base end of both movable electrodes 25 and a distal end of both connection members 23, and the two movable electrodes 2.
5 is rotatable around a rotation pin 26.

And the power-supply-side and load-side cables;
The power supply-side conductor 14, the fixed electrode 15, the movable electrode 25, the connection member 23, and the load-side conductor 20 constitute a power distribution line. If a ground fault occurs in the power distribution line, the zero-phase current transformer 16 and the zero-phase voltage detector 22 detect the ground fault, and if a short-circuit fault occurs, the current transformer A short circuit accident is detected by 40.

As shown in FIG. 1, a power supply transformer 27 is provided inside the main body case 12. As shown in FIG. 4, fixing members 28 are fixed to both lower sides of the power transformer 27, and the fixing members 28 are provided with fixing pieces 29 protruding downward. As shown in FIG. 1, the fixing piece 29 is fitted into a substantially U-shaped locking member 12 a fixed to the inner surface of the main body case 12. Further, a fixing plate 12b which expands toward the inside of the main body case 12 is provided at a lower portion of the main body case 12, and a detachable bolt 12c penetrating the fixing plate 12b is screwed into a lower portion of the power transformer 27, The power transformer 27 is fixed to the main body case 12.

As shown in FIG. 4, two input terminals 30 having conductivity are provided side by side on the upper side of the power transformer 27. Each input terminal 30 is provided with a flat connection piece 31 protruding upward, and the connection piece 31 is provided with a screw hole 32 extending in a direction orthogonal to the connection piece 31. Each input terminal 30 is provided with a mounting piece 33 extending in a direction orthogonal to the connection piece 31.
The input terminals 30 are formed in a substantially L-shape by the mounting piece 33 and the mounting piece 33. And the input terminals 30 on both sides are
The mounting piece 33 is fixed to the power supply transformer 27 by attaching the mounting piece 33 to the power supply transformer 27 with a mounting bolt 34.

A support terminal 41 is provided at the upper center of the power transformer 27. This support terminal 41 has a fixing piece 4 protruding upward like the connection piece 31.
2 are provided. The fixing piece 42 is made of an insulating material, and has a screw hole 43 similarly to the connection piece 31.
The two connecting pieces 31 and the fixing pieces 42 are arranged as shown in FIG.
As shown in (a) to (c), each of the three load-side bushings 19 of each phase is inserted between a pair of connecting members 23 connected to the load-side conductor 20. Then, both the connecting pieces 31 and the fixing pieces 42 are connected to the respective connecting members 23 by supporting bolts 35 that are screwed into the respective connecting members 23 through the screw holes 32 of the both connecting pieces 31 and the screw holes 43 of the fixing pieces 42. , The three connecting members 23 are connected to the power transformer 2.
7 and is supported by the main body case 12.

As shown in FIG. 1, an opening / closing mechanism 36 is provided in the main body case 12, and the output side of the power transformer 27 is electrically connected to the opening / closing mechanism 36 via an output lead wire (not shown). I have. The opening / closing mechanism 36 has a drive lever 37, and the drive lever 37 is rotatable around its base end. A driven lever 3 is provided at the tip of the drive lever 37.
8 are connected to each other, and the driven lever 38 is rotatable around the base end. These two levers 37, 38
Are arranged side by side in the same direction as the power supply side and load side bushings 13 and 19. And the driven lever 3
2 (a) to 2 (c), is disposed between the pair of movable electrodes 25, and is supported by a connecting pin 39 which penetrates both movable electrodes 25 and the distal end of the driven lever 38. ing. The driven lever 38 is rotatable with respect to the connecting pin 39.

When the zero-phase current transformer 16 and the zero-phase voltage detector 22 detect that a ground fault has occurred in the distribution line, or the current transformer 40 causes a short circuit in the distribution line. If the distribution line becomes uncharged due to the opening of the circuit breaker provided in the substation after it is detected that the connection terminal 23 is connected to the input terminal 30 through the two connecting members 23 shown in FIGS. The power is supplied to the opening / closing mechanism 36 via the power transformer 27. Further, when the opening / closing mechanism 36 is driven by the power supply, the driving lever 37
Rotates around its base end, and the drive lever 37, the driven lever 38, and the movable electrode 25 are moved from the closing position P1 shown by the solid line in FIG. 1 to the open position P2 shown by the two-dot chain line. ing.

Next, the switch 11 constructed as described above is used.
The operation of will be described. In order to attach and fix the three connecting members 23 to the power transformer 27, with the two input terminals 30 on both sides removed from the power transformer 27, a pair of fixing pieces 42 of the support terminal 41 are positioned at the center. It is inserted between the connection members 23. Then, the connection piece 31 of the input terminal 30 formed in a substantially L shape is inserted between the pair of connection members 23 located on both sides. Then, each of the pair of connecting members 23 is connected via the screw hole 32 of the connecting piece 31 and the screw hole 43 of the fixing piece 42.
Of the input terminal 30 by screwing the support bolt 35 into the
The connection terminals 41 are attached and fixed to the respective connection members 23.

Further, in a state where the input terminals 30 located on both sides are aligned with the power transformer 27, the mounting pieces 33 of the input terminals 30 are mounted on the power transformer 27 by mounting bolts 34. Both input terminals 30 are fixed. Since the attachment piece 33 extends in a direction perpendicular to the connection piece 31, the attachment piece 33 is easily attached to the power transformer 27 by the attachment bolt 34. Each connecting member 23 is supported by the main body case 12 via the input terminal 30 and the connecting terminal 41 and the power transformer 27.

On the other hand, power supply side and load side distribution cable,
When a ground fault occurs in the power distribution line composed of the power supply-side conductor 14, the fixed electrode 15, the movable electrode 25, the connection member 23, and the load-side conductor 20, the zero-phase current transformer 16 and the zero-phase voltage detection are performed. A ground fault is detected by the switch 22 and power is supplied from the connection member 23 to the switching mechanism 36 via the input terminal 30 and the power transformer 27 based on the detection. Further, when the opening / closing mechanism 36 is driven by the power supply, the drive lever 37 rotates around its base end. As a result, the drive lever 37, the driven lever 38, and the movable electrode 25 are moved from the closing position P1 shown by the solid line in FIG. 1 to the open position P2 shown by the two-dot chain line, and the movable electrode 25 is separated from the fixed electrode 15. When a short-circuit accident occurs in the distribution line, after the short-circuit accident is detected by the current transformer 40, the distribution line becomes uncharged by opening a circuit breaker provided in the substation, and then the ground fault is detected. The movable electrode 25 is separated from the fixed electrode 15 in the same manner as when an accident is detected.

As described in detail above, in this embodiment, three connection members 23 for each phase are supported by the two input terminals 30 provided on the power transformer 27 and the support terminals 41 provided therebetween. I made it. Therefore, unlike the related art, the connecting member 23 can be supported in an insulated state with respect to the main body case 12 without using an insulator. In addition, since the input terminal 30 both supports the connection member 23 and supplies power to the opening / closing mechanism 36, the main body case 12
Can be simplified.

Further, the input terminal 30 is composed of a connecting piece 31 connected to the connecting member 23 and a mounting piece 33 extending in a direction orthogonal to the connecting wire 31. Therefore, the connection piece 31
Can be attached to the power supply transformer 27 with the attachment bolts 34 even when the connection terminal 23 is connected to the connection member 23, and the input terminal 30 can be easily attached to the power supply transformer 27 by the attachment piece 33. it can.

In this embodiment, the zero-phase voltage detector 22 is directly mounted on the load-side conductor 20 by the mounting bolt 21. Therefore, a case where the mounting plate or the like on which the zero-phase voltage detector 22 is mounted is fixed to the main body case 12 in an insulated state, and the zero-phase voltage detector 22 is electrically connected to the load-side conductor 20 by a lead wire or the like. The work of mounting the zero-phase voltage detector 22 can be performed more easily than in the case of

Further, in this embodiment, an arc-extinguishing grid 18 for extinguishing an arc generated when the movable electrode 25 is separated from the fixed electrode 15 is attached to a cover 17 for covering the zero-phase current transformer 16. . Therefore, since the arc extinguishing grid 18 can be attached to the main body case 12 simply by attaching the cover 17, the attaching operation can be easily performed as compared with a case where the cover 17 and the arc extinguishing grid 18 are separately attached. .

The present invention can be embodied with the following modifications. (1) In this embodiment, the present invention is embodied in a switch.
The present invention may be embodied in a switching device such as a circuit breaker or a disconnector. In this case, the same effects as those of the embodiment are obtained.

(2) In this embodiment, the shapes of the input terminal 30 and the support terminal 41 may be appropriately changed as long as the connection member 23 can be supported. For example, the shape of the input terminal 30 and the support terminal 41 may be formed in a cylindrical rod shape or a square rod shape. In this case, the same effect as that of the embodiment is obtained.

Next, technical ideas other than the claims which can be understood from the above embodiments will be described below together with their effects. (1) The switchgear according to any one of claims 1 to 3, wherein a zero-phase voltage detector for detecting a fault current is directly attached to the second conductor. In this case, attachment of the zero-phase voltage detector becomes easy.

(2) In the switchgear according to any one of claims 1 to 3, a zero-phase current transformer for detecting a fault current is provided on the first conductor, and the zero-phase current transformer is insulated. An opening / closing device provided with an arc-extinguishing grid for extinguishing an arc generated when the movable electrode and the fixed electrode are separated from each other. In this case, attachment of the arc-extinguishing grid becomes easy.

[0034]

According to the first aspect of the present invention, since both the support of the connecting member and the supply of power to the switching mechanism are performed by the input terminal provided in the power transformer, the inside of the body case in the switching device is provided. The configuration can be simplified.

According to the second aspect of the present invention, even if the first and second conductors are arranged in parallel for three phases corresponding to the respective phases of the distribution line, the first and second conductors are arranged in parallel. Of the connecting members provided between the two, both the support of the two connecting members provided on both sides and the supply of power to the opening and closing mechanism are performed by two input terminals provided in the power transformer. At the same time, the connection member located at the center is supported by the support terminal provided at the intermediate position between the two input terminals. Therefore, even in a switchgear in which the first and second conductors are arranged in three phases corresponding to each phase of the distribution line, the configuration in the main body case of the switchgear can be simplified.

In the invention according to claim 3, claim 1 or 2
In addition to the effects of the invention described above, since the attachment piece of the input terminal extends in a direction orthogonal to the connection piece connected to the connection member, the input terminal can be easily attached to the power transformer by the attachment piece.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a switchgear according to an embodiment.

FIGS. 2A to 2C are cross-sectional views illustrating a connection structure between a power-supply-side conductor and a load-side conductor.

FIG. 3 is a side view showing a power transformer.

FIG. 4 is a rear view showing a power transformer.

[Explanation of symbols]

11: switch as a switchgear, 12: body case, 1
4 ... power supply side conductor as first conductor, 15 ... fixed electrode, 20 ... load side conductor as second conductor, 23 ...
Connection member, 25: movable electrode, 27: power transformer, 30
... input terminal, 31 ... connection piece, 33 ... mounting piece, 36 ... opening / closing mechanism, 41 ... support terminal.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 33/28-33/59

Claims (3)

(57) [Claims] A first electrode provided with a fixed electrode in a main body case;
A conductor, a second conductor to which a movable electrode is connected via a connection member, and a power supply transformer having an input side connected to the connection member, and a power supply transformer from the connection member via a power supply transformer. An opening / closing device that supplies power to the opening / closing mechanism to drive the opening / closing mechanism, and rotates the movable electrode provided on the connecting member to connect or separate from the fixed electrode by driving the opening / closing mechanism; An opening / closing device in which a power transformer is provided with an input terminal electrically connected to a connection member, and the input terminal supports the connection member. In a main body case, a first conductor having a fixed electrode and a second conductor to which a movable electrode is connected via a connecting member are provided corresponding to each phase of a distribution line. A power supply transformer is provided in parallel for three phases, and an input side is electrically connected to two of the three phase connection members, and an opening / closing mechanism is provided from the two connection members via the power supply transformer. An opening / closing device that supplies power to the opening / closing mechanism and drives the opening / closing mechanism to rotate the movable electrode so as to connect or separate from the fixed electrode by driving the opening / closing mechanism. Two input terminals are provided which are electrically connected to two connection members located on both sides of the connection members arranged side by side, and are located on both sides by these two input terminals. While supporting two connecting members, at the intermediate position between the two input terminals The support pin is provided, of the three-phase Bun'nami set by said connecting member at the support pin, switchgear that supports the connecting member located in the center. 3. The input terminal comprises a connecting piece connected to a connecting member and a mounting piece extending in a direction orthogonal to the connecting piece and mounted on a power transformer. Switchgear.