JPH0356025Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a transformer with a built-in high voltage cut-out switch.

It is well known that a cut-out switch is built in to protect the primary side of a transformer, and a current-limiting type fuse or release type fuse is installed. They are usually connected using lead wires, which is difficult to work with, and requires special space to ensure insulation distance since the live parts of the connections come out. For this reason, as shown in FIGS. 1 and 2, a storage pocket is provided above the transformer A, and the cutout is stored and locked in the storage pocket, but this configuration takes time and effort to provide the storage pocket.

In addition to the above-mentioned drawbacks, the cylindrical outer shape of the transformer has many irregularities, which poses a problem in terms of harmony with the surrounding environment of the pole.

This idea was made in view of these points, and in order to organically connect the primary side bushing of the transformer and the above-mentioned cutout, one end of the cutout is penetrated and inserted from the side wall of the transformer. A cut-out switch that is supported within a transformer, engages the other end of the cut-out with a primary bushing, and simultaneously electrically connects the primary bushing and the cut-out, and is extremely simple in structure and easy to install. This provides an extremely compact transformer with a built-in transformer that is in harmony with the surrounding environment.

An embodiment of this invention will be described below with reference to FIG. 3 and below. Reference numeral 1 denotes a transformer body, and the transformer 1 has a half-moon-shaped top cut out to form an oil-tight container. 2 is the upper wall 1 at the top of this transformer body 1
3 is a primary bushing that is inserted and locked into the through hole 2, and this primary bushing 3 has a flange 3a provided in the middle placed on the periphery of the through hole 2, and is inserted from above the flange 3a. It is fixed to the transformer body 1 with a holding fitting 4 and bolts and nuts 5. 6 is a packing provided between the outer periphery of the bushing 3 and the through hole 2; 7 is an annular groove provided on the lower surface of the bushing 3; 8 is a concave groove bored inside the annular groove 7 on the lower surface of the bushing 3; A conductor 9 protrudes into the inner part of the groove 8, and the conductor 9 is electrically connected to a core wire in a cable head 10 which is integrally fixed to the bushing 3 outside the transformer main body 1. Reference numeral 11 denotes a cut-out body made of an approximately cylindrical epoxy resin or the like with one end closed.The cut-out body 11 is inserted into the cut-out body 11 through a hole 12 provided in the divided side wall 1b at the top of the transformer body 1, and the other end is inserted into the cut-out body 11. Flange 1 on the side
1a to the periphery of the hole 12, and press it with the metal fitting 13.
and is fixed with bolts and nuts 14. 15
16 is a gasket interposed between the hole 12 and the outer periphery of the cutout body 11, and 16 is an annular protrusion provided integrally with the cutout body 11 on the outer periphery of one end of the cutout body 11 in the transformer body 1. 16 is fitted into the annular groove 7 of the bushing 3. 17 is the cutout body 11 mentioned above.
This hollow part 17 includes a fixed electrode (not shown) supported by a fixed electrode stand 18 that supports one side of the fuse cylinder, a cylindrical arc extinguishing chamber 19, and a cylindrical arc extinguishing chamber 19, and the other side of the fuse cylinder. A fixed electrode (not shown) supported by a supporting fixed electrode stand 20 is provided. 21
is a fuse tube inserted into the hollow part 17 of the cut-out switch 11 through the opening 17a protruding outward from the transformer main body 1; the center part of the fuse tube 21 is inserted into the arc extinguishing chamber 19; Cap-shaped electrodes 22 and 23 are respectively engaged and supported by fixed electrodes (not shown) supported by the fixed electrode stands 18 and 20 on both sides. Reference numeral 24 denotes an arc-extinguishing tube that covers the tip of the electrode 22 located deep inside the hollow portion 17, 25 a guide fixed within the opening 17a of the hollow portion 17, and 26 an end of the fuse tube 21 within the opening 17a. 27 is a sealing cover that is covered and locked at one end of the cut-out body 11 in order to close the opening 17a; 28 is the inner part of the hollow part 17 of the cut-out body 11; Electrode stand 18 supporting fixed electrodes of
This terminal 28 is inserted into the concave groove 8 of the bushing 3, and is electrically connected to the conductor 9 and protrudes into the annular protrusion 16.
The gripping portions at both ends are detachably connected via flexible so-called tulip type contacts 29. 30 is an opening 17a of the cutout main body 11
It is a connecting conductor with one end fixed to the electrode stand 20 supporting the fixed electrode provided on the side, and the other end passed through the peripheral wall of the cutout body 11 and exposed to the outside of the lower part to form the load side terminal part 30a. .

Therefore, in this invention, the top of the transformer body 1 is cut into a half-moon shape to form an oil-tight container, and the cut-out body 11 is penetrated and fixed to the partitioned side wall 1b, and the cut-out body 11 is fixed to the upper wall 1a of the transformer body 1. Assembling is easy because it is removably contact-fitted with the primary bushing 3 fixed through the hole, and at the same time, the conductor 9 protruding into the groove 8 of the primary bushing 3 and the annular shape of the cutout body 11 are connected to each other. It has a structure in which a power supply side terminal 28 protruding into the projecting body 16 is connected, and the cutout main body 11 can be easily installed into the transformer main body 1, and at the same time, the structure is simplified.
Moreover, since the annular protrusion 16 and annular groove 7 of the cutout body 11 and the primary bushing 3 fit together, the live parts are completely hidden, making insulation design easy and allowing the cutout of the transformer 1 to be stored. It takes up less space and can be made more compact. Further, there is no need to connect a lead wire between the primary bushing 3 and the power supply terminal 28 of the cutout body 11 as in the conventional case. Furthermore, in the above embodiment, the load side electrode, that is, the fixed electrode 20, is folded back by the connecting conductor 30 and led to the load side terminal portion 30a on the outer surface of the lower side wall of the cutout body 11, so that the length of the cutout body 11 can be kept short. can.

In this way, this idea allows for a transformer with a built-in cut-out switch to be miniaturized, easy to install, and has less unevenness on the outside, allowing it to harmonize with the surrounding environment where the transformer is installed. It has advantages such as good appearance.

[Brief explanation of drawings]

Fig. 1 is a partially cut-away plan view showing a conventional example, Fig. 2 is a partially cut-away front view of the same, Fig. 3 is a partially cut-away plan view showing an embodiment of this invention, and Fig. 4 is a partially cut-away front view of the same. 5 are longitudinal cross-sectional views of essential parts in an embodiment of this invention. In the figure, 1 is the transformer main body, 3 is the primary bushing, 7 is an annular groove, 8 is a concave groove, 9 is a conductor, 11 is a cutout body, 16 is an annular projection, 17 is a hollow part, 21 is a fuse tube, 28 is a power supply side terminal.

Claims (1)

[Scope of utility model registration request] A groove with a conductor protruding inside the lower end of the primary bushing that penetrates the upper wall of the transformer and is fixed at that point, and an annular groove around the outer circumference of the groove, and a hole drilled in the side wall of the transformer. Insert the cutout body containing the fuse tube into the transformer, lock the other end in the hole, and insert one electrode of the fuse tube into the annular protrusion provided on the outer periphery of one end of the cutout body inside the transformer. The electrically connected terminal is made to protrude, and the annular protrusion of the cutout body is fitted into the annular groove of the bushing, whereby the terminal of the cutout body is connected to the conductor in the groove of the bushing. A transformer with a built-in high-voltage cutout switch, characterized in that the other electrode of the fuse tube in the cutout body is electrically connected to a terminal provided on the outer surface of the outer peripheral wall of the cutout body.