JPH02308511A - Resin mold transformer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to transformers, transducers, CTs, and PTs using resin molded coils.

[Conventional technology]

In the conventional device, as described in Japanese Patent Application Laid-Open No. 61-70908, the coil is cooled by connecting the outer circumferential wall of the molded coil and the case fins with a heat pipe.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into consideration the temperature distribution of the resin molded coil during natural cooling, and has problems such as the cooling effect of the cooling method using a heat pipe and the large size of the resin molded coil.

An object of the present invention is to efficiently cool a resin molded coil, thereby promoting miniaturization of the resin molded coil and providing a cheaper resin molded transformer.

[Means to solve the problem]

In order to achieve the above object, heat pipes are arranged in the axial direction of the coil and also in the circumferential direction on the outer circumferential surface of the coil, between the inner and outer divided coils, or between the inner and outer windings. When installing heat pipes in the axial direction of the coil, all heat pipes must be installed at a height of 172 cm from the top of the coil.
It is designed to reach up to.

[Effect]

A heat pipe that is placed on the inner and outer circumferential surfaces of the coil, between the inner and outer divided coils, or between the inner and outer different windings, and that reaches at least 172 mm above the coil height from the top end of the coil, has the highest temperature among the resin molded coils of the natural cooling coil. The heat inside the resin molded coil can be drawn out to the outside most efficiently. Therefore, the resin molded coil can be made even more compact.
The installation space for the transformer can be reduced. Also, the direction in which the temperature distribution inside the resin molded coil becomes uniform (the direction in which the temperature difference between the high temperature part and the constant temperature part in the coil becomes smaller)
Therefore, the thermal stress generated in the resin molded coil can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. A heat pipe is embedded in the resin molded coil in the axial direction of the coil, and the heat generated within the coil is extracted to the outside and cooled by the heat dissipation section. The temperature distribution of the natural cooling coil is highest at a point located 1/3 of the height of the coil from the upper end of the coil (indicated by the solid temperature rise line in Figure 3). Therefore, the length of the heat pipe in which the coil is embedded is The height should be at least 1/2 of the coil height. In addition, by changing the length of the heat pipe in the circumferential direction of the coil, the density of the heat pipe inside the coil can be rationally adjusted. (indicated by the rising dashed line). This can reduce the thermal stress generated in the molded coil. Furthermore, since the heat inside the molded coil can be efficiently radiated to the outside, there is an effect that the molded transformer can be made smaller.

FIG. 4 shows the configuration of the embodiment. A heat pipe 1 is embedded in a molded coil 5 and heat is radiated from a heat radiating part 6. FIG. 5 shows another embodiment. In a molded coil in which a high voltage coil 8 and a low voltage coil 9 are arranged concentrically, a heat pipe 1 is continuously arranged around the outer periphery of the low voltage coil. Since the heat pipe is conductive, it can also serve as a cross-contact prevention plate between the high and low voltage coils, and also acts as an electrostatic shield between the high and low voltage coils, preventing surge voltage from entering the high voltage coil. It has the effect of reducing migration.

FIG. 6 shows another embodiment in which high- and low-voltage coils similar to those in FIG. 5 are arranged concentrically, but heat pipes are separately provided for both the high-voltage coil and the low-voltage coil. If the length of the heat pipe is adjusted to match the temperature distribution of the coil as shown in FIG. 2, efficient cooling characteristics can be obtained.

〔Effect of the invention〕

According to the present invention, by appropriately arranging the heat pipe inside the resin molded coil, the heat inside the resin molded coil can be efficiently released to the outside of the coil (the coil can be cooled), so the size of the resin molded coil can be reduced. This has the effect of making resin molded transformers more compact.

Furthermore, by using a heat pipe, the temperature distribution within the resin molded coil can be made uniform, which has the effect of suppressing the thermal stress generated in the coil.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a temperature distribution diagram according to FIG. 1, and FIG. 4 is a configuration diagram of the embodiment. Figures 5a and 5b are a plan view and a vertical cross-sectional view of an embodiment of the pond, respectively, and Figure 6 is a vertical cross-sectional view of another embodiment. 1 item Heat pipe, 2... High voltage coil, 3... Low voltage coil, 4... Molded resin, 5... Molded coil, 6... Heat dissipation part, 7... Iron core, 8... High voltage coil, 9...Low voltage coil, 10...Iron core Fig. 3 Fig. 5 Concave Fig. 6

Claims (1)

[Claims] 1. In a resin molded transformer, which has a winding formed by winding electric wire and interlayer paper, a resin layer covering the winding, and a heat pipe provided between the winding layers or at least one place on the outer periphery of the winding, the height of the coil of the heat pipe is A resin molded transformer characterized by using a resin molded coil having multiple lengths in different directions and arranged in the circumferential direction of the coil.