JP2642191B2 - Switch for built-in transformer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a switch mounted on a transformer.

[Problems to be Solved by the Related Art and the Invention] Generally, in a high-voltage power receiving facility in which a switch is a main shutoff device, three bushings are erected at an upper end of a transformer attached to a utility pole or the like, and each bushing is provided with a bushing. It is known that a fuse is detachably attached to the upper end, and that these fuses are connected to three switches attached to a distribution line by a down line. An electrical path is formed.

However, in the case of checking the fuse in the switch or the like, or replacing the fuse with a new one by blowing the fuse due to a short-circuit current, an electric shock, or the like, it is necessary to open an electric circuit separately for each phase. Also, in this case, since the fuse and the switch are located at separate positions, the work of opening each circuit and the work of checking and replacing the fuse must be performed in different places. And the workability is poor.

On the other hand, apart from the transformer, an opening mechanism for disposing the bushing and the fuse in the case, and for inspecting the fuse or opening the three-phase circuit at the same time when the fuse is blown is provided. A switch provided with a switch is known. However, in this switch, as described above,
Since the bushing, the fuse, and the switching mechanism are incorporated in the case, the entire switch becomes large, and there is a problem that it is difficult to assemble this into the transformer. In particular, when the fuse is configured to be mounted horizontally on the case, the switch becomes large in the horizontal direction, and such a switch cannot be mounted on the transformer.

An object of the present invention is to reduce the size of the entire switch, particularly in the horizontal direction, and not only to assemble it into a transformer, but also to make it possible to easily replace a fuse from an obliquely lower position during mounting. Another object of the present invention is to provide a transformer-incorporated switch which also has a phase loss prevention mechanism and can simultaneously open and close three-phase electric circuits.

Means for Solving the Problems In order to achieve the above object, the present invention disposes three fuse cylinder holders in parallel from the upper part of the case to the lower part obliquely and opens the lower ends thereof to the outside of the case. In addition, the case is provided with a guide inclined surface following the lower end opening portion of the fuse cylinder holder so that the fuse of the fuse cylinder holder can be replaced, and three power supplies penetrating the case on one side of the upper surface of the case. A fixed electrode is disposed inside the side bushing, and a movable contact blade corresponding to the fixed electrode so as to be able to contact and separate from the fixed electrode is rotatably attached to each of the fuse cylinder holders. An operating mechanism for simultaneously turning the movable contact blade on and off by external operation is provided, and a transformer-side bushing connected to the transformer is provided on the bottom of the case. Dynamic contact blade,
The gist of the present invention is a transformer-incorporated switch in which an electric circuit including a fuse and a bushing on the transformer side is formed.

[Operation] When the fuse is mounted on the fuse cylinder holder from the lower end open portion of the fuse cylinder holder along the guide inclined surface of the case, and the movable contact blade is brought into contact with the fixed electrode of the power supply side bushing by the operating mechanism, An electric path including a power supply side bushing, a fixed electrode, a movable contact blade, a fuse, and a transformer side bushing is formed. The opening and closing of the electric circuit are performed simultaneously by the operating mechanism in three phases.

In this switch, each fuse cylinder holder is arranged obliquely downward from the upper part of the case, and a movable contact blade is rotatably attached to the fuse cylinder holder,
In addition, since the power supply side and the transformer side bushings are arranged vertically inside the case, the size in the horizontal direction is particularly smaller than that of the conventional switch.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 and 3, the case 1 of the switch mounted on the upper end of the transformer T has a substantially cylindrical shape with an "OFF" indication D indicating the open state of the switch on one side. And a lid 1b that seals an upper opening portion of the main body case 1a. In the front part (the right part in FIG. 2) of the main body case 1a, a recess 2 comprising a mounting surface 2a and a guide inclined surface 2b is provided, and the upper half of the mounting surface 2a and the guide inclined surface 2b is ,
It is covered by a cover 3 provided on the front surface of the main body case 1a so as to be openable and closable. On one side of the cover 3, an indication C of "ON" indicating the ON state of the switch is engraved.

On the mounting surface 2a, three fuse cylinder holders 4 are arranged in parallel in the left-right direction (see FIG. 3), and these fuse cylinder holders 4 have the same inclination direction as the guide inclined surface 2b. It extends obliquely upward. As shown in FIG. 1, the upper and lower ends of each fuse tube holder 4 are open, and a power supply contact 5 and a load contact 6 are mounted on the upper end and substantially the center of the fuse cylinder holder 4, respectively. The load terminal 7 is connected to the contact 6. A connection line 8 extends rearward and downward from each load terminal 7. Then, by moving the current limiting fuse 9 up and down along the guide inclined surface 2b with the cover 3 opened, these can be attached to and detached from each fuse cylinder holder 4.

A substantially triangular plate-shaped driven lever 12 is supported by a mounting bracket 11 fixed to an upper end portion of each of the fuse cylinder holders 4 so as to be rotatable backward. The upper end of a connecting rod 14 is connected to the rear end of each driven lever 12. These connecting rods 14 extend downward, and their lower ends are connected to a lever 16 on a rotating shaft 15 that is rotatably installed below the main body case 1a. When the driven lever 12 is rotated backward about the shaft 13 in response to the projecting operation of the fusing display device 9a of the current limiting fuse 9 mounted in the fuse cylinder holder 4, the connecting rod 14 and the lever Rotation axis 15 via 16
Is rotated counterclockwise.

At the rear of the lid 1b, three power-supply-side bushings 17 connected to a pull-down line 10 (see FIGS. 2 and 3) extending from a distribution line (not shown) are provided so as to correspond to the fuse cylinder holder 4. Mounted in parallel in the direction. These power supply side bushings 17 extend downward, and are formed at the lower ends thereof.
An arc-extinguishing chamber 21 having a fixed electrode 19 is mounted in 18. Further, a mounting piece 4a attached to the rear portion of each of the fuse cylinder holders 4 and electrically connected to the power supply side contact 5 through a conductive plate 22 contacts and separates from the fixed electrode 19. The corresponding movable contact blade 23 is supported on the shaft 20 so as to be rotatable in the vertical direction.

The contact / separation operation of the movable contact blade 23 with respect to the fixed electrode 19 includes:
The operation is performed by the operation mechanism A provided in the main body case 1a. The operation mechanism A will be described. As shown in FIG. 1, a rotation shaft 24 is rotatably installed at a position behind the inclined guide surface 2b in the main body case 1a.
At the top, the rear ends of three levers 25 extending rearward are fixed. These levers 25 and the movable contact blades 23
Linked by 26.

As shown in FIGS. 2 and 3, on one side of the main body case 1a, an operation shaft 27 is rotatably provided at a substantially central portion thereof, an operation handle 28 is provided at an outer end thereof, and an operation handle 28 is provided at an inner end thereof. Fifth
As shown in the figure, the upper ends of the operating levers 29 extending rearward and downward are respectively fixed. On the rotating shaft 15 to which the lever 16 is fixed, a locking lever 31 extending forward and backward is fixed at a substantially central portion thereof. Then, the operating lever 29
Is connected to the upper end of the interlocking link 32, and the rear end of the locking lever 31 is connected to an elongated hole 32a formed at the lower end of the interlocking link 32.

A driven lever 33 and a lever 34 are fixed on the rotation shaft 24. The driven lever 33 has a substantially triangular plate shape,
A locking projection 33a is fixed to the lower end thereof, and the locking projection 33a is detachably locked to a notch 31a formed at the lower end of the front part of the locking lever 31.

On the other hand, a mounting piece 35 is provided on the inner surface of the guide inclined surface 2b, and the mounting piece 35 and the lever 34 are connected by a coil spring 36, and the lever 34 is constantly pulled forward and downward. When the engagement between the locking projection 33a of the driven lever 33 and the notch 31a of the locking lever 31 is released, the driven lever 33 and the levers 25 and 34 on the rotating shaft 24 rotate counterclockwise. Is done. Note that a stopper mounting piece having a stopper 37 is provided above the mounting piece 35 on the inner surface of the guide inclined surface 2b.
The stopper 37 restricts the forward rotation of the driven lever 33.

The operating lever 29 and the driven lever 33 are connected by connecting means B. The connecting means B will be described. As shown in FIGS. 4 and 5, a pair of link members 39 are connected from right and left sides of the operating lever 29 directly above the connecting portion with the interlocking link 32, as shown in FIGS. . Each link member 39 extends forward, and a long hole 39a is formed through the front end thereof. The elongated holes 39a are provided in the driven lever 33.
The projection 40 projects outward from the rear end to both left and right sides. Further, a pair of auxiliary links 41 are connected to the projections 40 exposed to the left and right outside from the pair of long holes 39a. A coil spring 42 is wound around the link member 39 between the link member 39 and the auxiliary link 41 in a compressed state, and the link member 39 and the auxiliary link 41 are urged in both front and rear directions.

By the way, as shown in FIG.
From the rear of 1c, three lightning proof elements 43 are erected corresponding to the respective fuse cylinder holders 4, and the upper half thereof is covered with an insulating cover member 44. A connection line 8 extending from the load-side terminal 7 of each of the fuse cylinder holders 4 is connected to a connection terminal 43a at the upper end of each lightning proof element 43.

Further, the three bottom transformer bushings 46 are provided on the bottom plate 1c.
Are vertically penetrated, and connection wires 47 extending from the connection terminals 43a of the lightning protection elements 43 are connected to the connection fittings 45 in the transformer-side bushings 46 from above. The connection fitting
A conducting wire 48 is connected to a lower end of the conductor 45, and the conducting wire 48 is led downward from the bushing 46 on the transformer side, and is connected to the transformer T. And the power supply side bushing 17,
The fixed electrode 19, the movable contact blade 23, the current limiting fuse 9, and the transformer-side bushing 46 form a three-phase electric path.

Next, the operation and effect of the present embodiment configured as described above will be described.

FIGS. 1 and 5 show a state in which the current limiting fuse 9 is mounted in each fuse cylinder holder 4 and each movable contact blade 23 is in contact with the fixed electrode 19 in the power supply side bushing 17, that is, a closed state of the switch. Is shown. At this time, in the operating mechanism A, the locking projection 33a of the driven lever 33 is engaged with the notch 31a at the front end of the locking lever 31, and the closed state is maintained. In this state, the driven lever 33 is pulled forward and downward by a coil spring 36 connected to a lever 34 coaxial with the driven lever 33. Also, as shown in FIG.
The upper end of 28 is located on the “ON” display C engraved on the cover 3.

From the closed state, the operation handle 28 is centered on the operation shaft 27 to the “OFF” display D side engraved on the main body case 1a,
That is, when the counterclockwise rotation operation is performed, the operation shaft 27 is rotated.
The operating lever 29 fixed on the upper side is, as shown in FIG.
It is turned in the same direction against the urging force of the coil spring. Then, the rotation of the operating lever 29 is transmitted to the rear end of the locking lever 31 via the interlocking link 32, and the locking lever 31 is
It is rotated counterclockwise about 15.

When the engagement between the locking projection 33a of the driven lever 33 and the notch 31a of the locking lever 31 is released, the driven lever 33 is deflected about the rotation shaft 24 by the coil spring 36. It is turned clockwise. The rotation of the driven lever 33 is restricted by contacting the stopper 37 as shown in FIG. With the rotation of the rotation shaft 24, each lever 25 rotates in the same direction, and the rotation is transmitted to each movable contact blade 23 via the connection link 26. As a result, each of the movable contact blades 23 simultaneously rotates downward about the shaft 20 and separates from the fixed electrode 19 in the power supply-side bushing 17, so that the three-phase electric paths are simultaneously opened.

Thus, when the switch is open, the driven lever 33
Since the lower end of the operating lever 29 is pulled forward through the connecting means B connected to the rotation of the lever, the open state is maintained.

When the switch in the open state is turned on, the operation handle 28 is rotated clockwise in the "in" display C side in the reverse procedure. Then, operation axis 27
The operating lever 29 fixed above is rotated in the same direction as shown in FIG. The rotation of the operating lever 29 is transmitted to the driven lever 33 via the link member 39, and the driven lever 33
Is rotated clockwise around the rotation shaft 24 against the tensile force of the coil spring 36. At this time, lever 25
, The movable contact blades 23 are simultaneously rotated upward about the shaft 20 to come into contact with the fixed electrode 19, and all three phases are closed. When the notch 31a of the locking lever 31 and the locking projection 33a of the driven lever 33 engage as shown in FIG. 5, the contact state between the movable contact blade 23 and the fixed electrode 19 is maintained.

By the way, the current limiting fuse 9 due to short-circuit current, electric shock, etc.
Is blown from the current-limiting fuse 9
9a protrudes. Then, as shown by the two-dot chain line in FIG.
The driven lever 12 is rotated counterclockwise about the shaft 13, and the connecting rod 14 connected to the rear end moves downward. The lowering of this connecting rod 14 is performed via a lever 16
The rotation is transmitted to the rotation shaft 15 and the dynamic rotation shaft 15 rotates counterclockwise.

Then, similarly to the case where the operation handle 28 is turned to the "OFF" display D side, the notch 31a of the locking lever 31 is disengaged from the locking projection 33a of the driven lever 33, and the fixed electrode 19 is disengaged.
The movable contact blade 23 is separated from the, and all the electric paths are opened. In this state, the cover 3 is opened from the main body case 1a, and the blown current limiting fuse 9 is removed from the fuse cylinder holder 4 and replaced with a new one. In the present embodiment, the inclination of the fuse cylinder holder 4 and the inclination of the guide inclined surface 2b are set to be in the same direction. Only by pushing up the current limiting fuse 9 upward, the current limiting fuse 9 can be positioned with respect to the open portion at the lower end of the fuse cylinder holder 4, and the same current limiting fuse 9 can be easily mounted.

By the way, as described above, in the switch of the present embodiment, each fuse cylinder holder 4 is disposed obliquely downward from the upper portion of the main body case 1a, and the movable contact blade 23 is rotatable behind them. In addition, the power supply side bushing 17 penetrates the lid 1b, the transformer side bushing 46 penetrates the bottom plate 1c up and down, respectively, and the fuse cylinder holder 4, the movable contact blade 23, the power supply side bushing 17 and the transformer side Since the structure in which the operation mechanism A is disposed between the bushings 46 is adopted, the size in the horizontal direction is particularly smaller than that of the conventional switch, and the switch can be assembled to the existing transformer T.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to reduce the size of the switch as a whole and to assemble the switch into a transformer, and also to replace the fuse from a diagonally lower position during mounting. It has an excellent effect that it can be easily performed, has a phase loss prevention mechanism, and can simultaneously open and close three-phase electric circuits.

[Brief description of the drawings]

1 is a sectional view of a switch, FIG. 2 is a side view showing a state in which the switch is assembled to a transformer, and FIG. 3 is a view of the switch. 4 is a partially cutaway front view, FIG. 4 is a partial plan sectional view of the switch, and FIG.
6 and 7 are side views showing the operating state of the operating mechanism. 1 ... Case, 2b ... Guide inclined surface, 4 ... Fuse cylinder holder, 9 ... Current limiting fuse, 17 ... Power supply side bushing, 19 ... Fixed electrode, 23 ... Movable contact blade, 46 ... Transformer side bushing, A: Operation mechanism, T: Transformer.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Eitaro Morimura 1 Aichi-cho, Kasugai-shi, Aichi, Japan Aichi Electric Co., Ltd. (72) Inventor Hisanori Oike 1 character small needle, Inuyama-shi, Aichi, Japan Energy Support Co., Ltd. (56 References: Japanese Utility Model Application Sho 53-151560 (JP, U) Japanese Utility Model Application Sho 59-184444 (JP, U)

Claims (1)

(57) [Claims] 1. Three fuse cylinder holders are arranged in parallel obliquely downward from the upper part of a case, and their lower ends are opened to the outside of the case. The following guide inclined surface is provided so that the fuse of the fuse cylinder holder can be replaced. A fixed electrode is disposed inside three power supply side bushings penetrating the case on one side of the upper surface of the case. A movable contact blade corresponding to the movable contact blade is rotatably attached to each of the fuse cylinder holders, and an operation mechanism for simultaneously turning on and off the movable contact blades of all phases by external operation is provided in the case. In addition, a transformer-side bushing connected to the transformer is provided on the bottom of the case to form an electric circuit consisting of the power supply-side bushing, fixed electrode, movable contact blade, fuse, and transformer-side bushing. Transformer embedded switch, characterized in that the.