JP2501605Y2 - Device for connecting coils between mold transformers - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a coil-to-coil connecting device for a molded transformer.

B. Outline of the Invention The present invention connects the coil-to-coil connection of the mold transformer while keeping it airtight with a premolded connection body without exposing it to the atmosphere, and completely covers the surface of the mold transformer with a ground layer. The safety insulation distance from the structure is shortened to reduce the installation area and the environment resistance is improved.

C. Conventional technology In a molded transformer, a coil is molded with synthetic resin to form an insulating layer, and high-voltage coils for each phase are connected by drawing lead wires outside the mold. 4 and 5 show conventional examples of such molded transformers. In these figures, 1 is an iron core, 2 is a molded coil, 3 is a terminal for a connecting conductor 4 between phase coils, and the connecting conductor 4 Externally connects one end of each phase coil to form a neutral point in a star connection. Reference numeral 5 is a connection terminal of the cable 6, and 7 is a low voltage terminal. The mold transformer described above was either installed in a grounded metal case or installed with a fence with a sufficient insulation space and a stand-off sign to set up the mold transformer. It was several times wider than the floor area of the vessel.

D. Issues to be solved by the invention In recent years when building fires have become a social problem, mold transformers with excellent insulation reliability, disaster prevention, flooding, and maintainability have come into wide use. In particular, in substation facilities for buildings in urban areas where land prices are soaring and construction costs are high, it is required to minimize the installation area regardless of new construction or renewal.

In order to meet such demands, the surface of the mold coil is treated to be conductive and grounded, and the entire mold transformer is covered with a ground layer to shorten the insulation distance from other structures and reduce the contact area. Although it is conceivable to reduce the size, it is a problem to process the high-voltage exposed conductive parts such as terminals. The present invention aims to improve the connection device between the coils of each phase.

E. Means for Solving the Problem The means for solving the above-mentioned problems in the present invention is a mold transformer in which a coil is molded with a synthetic resin, and a ground layer is provided on the surface of the mold coil. A connecting conductor terminal portion integrally formed with the mold is provided on the side of, and a taper hole having a smaller diameter toward the coil side is provided in the connecting conductor terminal portion, and a conductor connecting portion connected to the high-voltage coil is provided in the back. In addition, a connecting conductor for separately connecting the coils is molded with a synthetic resin, and a tapered fitting portion that fits into the tapered hole is provided at a portion facing the tapered hole, and a tip end of the fitting portion is provided. The connecting end of the connecting conductor is projected to form a premolded connecting body, and a ground layer is provided on the outer surface of the premolded connecting body, and the fitting portion of the premolded connecting body and the taper are formed. The hole is fitted through an elastic insulator, the connecting end of the connecting conductor is connected to the conductor connecting portion, and the premolded connecting body is attached to the connecting conductor portion.

F. Function The surface of the mold coil, the surface of the pre-molded connector that connects the coils of each phase, and the connecting conductor terminal are completely covered with the ground layer, and the connecting conductor terminal is hermetically held by the elastic insulator.

G. Embodiment FIGS. 1 and 2 show an embodiment of the present invention.
The drawing is a front view of the molded transformer, and FIG. 2 is a cross-sectional view of a connecting conductor terminal portion between each phase coil.

In FIGS. 1 and 2, 1 is an iron core, 8 is a mold coil, 81 is a high voltage side coil, 82 is a mold resin, 83 is a ground layer in which the surface of the mold resin 82 is conductively treated and grounded, and 9 is a mold coil. In the connecting conductor terminal portion between the phase coils provided so as to project on 8, the connecting conductor terminal portion 9 is provided with a tapered hole 92 facing the coil side. Behind the tapered hole 92,
The conductor connecting portion 10 to which one end of the high voltage side coil 81 is connected is provided, and the surface thereof is covered with the ground layer 91. 93 is burial, 9
4 is an escape area. Reference numeral 11 denotes a pre-molded connecting body for connecting the respective phases, which is formed by mold-insulating the connecting conductor 12 with a synthetic resin, and the tapered hole 92 is formed at a portion facing the tapered hole 92.
A conical trapezoidal protruding fitting portion 11a that fits in is provided. The end of the connecting conductor 12 projects from the tip of the fitting portion 11a and is inserted into the conductor connecting portion 10. Further, the outer surface of the premolded connector 11 is covered with the ground layer 13.
Reference numeral 14 denotes an elastic insulator, which is made of, for example, a rubber material, has a so-called cone-shaped cup shape that is substantially the same as the fitting portion 11a, and has a flange directed toward the outer circumference on the wide diameter side. When the fitting portion 11a is fitted into the tapered hole 92, the elastic insulator 1 is attached to the fitting portion 11a.
4 is fitted and fitted into the tapered hole 92. Reference numeral 15 denotes bolts and nuts for fastening the premolded connection body 11 to the terminal portion 9.

In this way, the connecting conductor 12 between the coils of each phase is embedded in the premolded connection body 11 having the ground layer 13 on the outer surface, so that the entire surface of the mold transformer is covered with the ground layer. . Further, when the connecting conductor 12 is inserted into the connecting portion 10 and the nut 15 is tightened, the frustoconical fitting portion of the premolded connecting body 11 is fitted into the tapered hole 92 via the elastic insulator 14 while keeping airtightness. No corrosive gas, moisture, etc., such as dust, will enter the connecting portion 10, and subsequent restoration work will be extremely easy even if the mold transformer is submerged due to water damage.

FIG. 3 is a view showing another embodiment. Instead of the studs and double nuts 15 used to fasten the pre-molded connection body 11 to the terminal portion 9 in FIG. Even if the elastic insulator 14 is deteriorated by being tightened by, and the elastic force is changed, the tightening force is kept constant by the elastic restoring force of the disc spring.

In the above, each phase coil is I explained the case of connecting, but also when connecting △,
The present invention can be applied by pulling out the winding start and the winding end of each phase coil from the terminal portion and connecting them inside the premolded connection body.

Further, as a matter of course, it is possible to cope with various voltage classes by appropriately selecting the depth of the tapered hole, the taper, and the pressure contact load.

H. Effect of the Invention The connecting conductor terminal between the coils for each phase of the mold transformer according to the present invention is a mold coil terminal part in which the frustoconical part of the pre-molded connector whose surface is covered with a ground layer and the surface is covered with a ground layer. The air-tight fit into the taper hole of the above through an elastic insulator, and the connection conductor embedded in the pre-molded connection body is connected to the conductor connecting portion provided in the back of the taper hole. It is possible to install the molded transformer directly in close proximity to other structures without installing it or housing it in a grounded metal case, etc., to minimize the installation area, and to prevent dust on the conductor connection part. It has excellent safety and environment resistance, such as preventing ingress of corrosive gas and moisture, and facilitating recovery from water damage, and also has a practical effect of minimizing the installation area. Is played.

[Brief description of drawings]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 is a front view of a molded transformer, FIG. 2 is a cross-sectional view of a connecting conductor terminal between phase coils, and FIG. The figure shows another embodiment of the present invention. 4 and 5 are a front view and a side view of a molded transformer showing a conventional example. 8: Mold coil, 9: Connection conductor terminal, 10 ...
Conductor connecting part, 11 …… Pre-molded connector, 12 …… Connecting conductor, 13,83,91 …… Grounding layer, 14 …… Elastic insulator, 92 …… Tapered hole.

Claims (1)

(57) [Scope of utility model registration request] 1. A mold transformer comprising a coil molded with a synthetic resin and a ground layer provided on the surface of the molded coil, wherein a connection conductor terminal portion integrally formed with the mold is formed on a side of the molded coil. The connecting conductor terminal portion is provided with a tapered hole having a small diameter toward the coil side, and a conductor connecting portion connected to the high-voltage coil is provided at the back of the tapered hole.
Separately, a connecting conductor for connecting the coils is molded with a synthetic resin, and a tapered fitting portion that fits into the tapered hole is provided at a portion facing the tapered hole, and a tip of the connecting conductor of the connecting conductor is provided at a tip of the fitting portion. The connection end is projected to form a premolded connection body, and the outer surface of the premolded connection body is provided with a ground layer, and the fitting portion of the premolded connection body and the tapered hole are fitted via an elastic insulator. In addition, the inter-coil connecting device of the mold transformer, wherein the connecting end of the connecting conductor is connected to the conductor connecting portion and the premolded connecting body is attached to the connecting conductor portion.