JPH03286510A - Transformer - Google Patents

Abstract

PURPOSE:To cool a transformer irrespective of the temperature inside a transformer installation chamber and to effectively utilize discharged heat by providing the following: a heat-collecting unit which has been arranged and installed at a gap part of mutually adjacent coils; and a heat-collecting unit connecting pipe which is connected to a heat exchanger. CONSTITUTION:A heat-collecting unit at the inside of windings 2 is connected, by using a heat-collecting unit connecting pipe 12, to a heat exchanger 15 through an external heat-collecting unit 13 arranged and installed between the windings 2 and through a circulating pump 14. A working fluid 10 is circulated; it is heat-exchanged by using a heat exchanger 15 for the windings 2; the cooled working fluid 10 is circulated in a heat-collecting unit; heat is transferred continuously and is heat-exchanged by using a heat-accumulating material 18 which is circulated by using a pump 17 by means of a heat-exchange element 16; its energy is stored in a heat accumulating tank 19. Thereby, a heat energy can be utilized effectively, the performance of a transformer is not deteriorated, the damage by a fire can be prevented, and the transformer can be made small and light in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transformer in which the cooling device used to convert alternating current into a suitable voltage is a dry type.

Conventional technology Conventional dry cooling systems for transformers use air to cool them. For small-capacity transformers, a self-cooling dry system that relies on air convection and natural heat dissipation from the transformer surface is used. For large-capacity transformers, a fan is attached to the bottom of the coil to forcefully blow air into the transformer to cool it. Usually, waste heat from transformers is not recovered. In the case of a transformer equipped with a fan, multiple fans are installed below the coil to improve cooling efficiency and to ensure that even if one fan fails, it will not have a significant impact on the overall system. . The lifespan of a fan is shorter than that of a transformer, so it must be replaced regularly, and some systems only operate the fan during the day if the load changes significantly between daytime and nighttime. .

Problems to be Solved by the Invention However, in the conventional configuration described above, although heat can be efficiently dissipated by the fan, there is a problem in that it is less effective when the indoor temperature where the transformer is installed rises. Another problem was that approximately 2% of the heat loss released by the transformer was not recovered at all.

The present invention solves the above-mentioned conventional problems, and aims to provide a transformer that can cool the transformer regardless of the indoor temperature in which the transformer is installed and that can effectively utilize waste heat. do.

Means for Solving the Problems To achieve this object, the transformer of the present invention includes a heat collection unit disposed in a gap between adjacent coils and a heat collection unit connecting pipe connected to a heat exchanger. or a configuration in which the heat collection unit, the heat exchanger, and the heat storage tank are connected by a heat collection unit connection pipe.

Function: With this configuration, the heat generated in the transformer is absorbed by the heat collecting unit and the heat is transferred to cool the transformer.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, the structure of the winding 2 of a transformer in which the winding 2 is provided on the iron core 1 will be explained with reference to FIGS. 1 and 2. As shown in the figure, a heat collecting unit 4 is disposed in a gap between a low voltage coil 3 and a high voltage coil 5 which are arranged concentrically. The low-voltage coil 3 is molded with resin 7 in a low-voltage coil body 6 made of a conductor and interlayer insulation material, and the high-voltage coil 5 is molded with resin 9 in a high-voltage coil body 8, with a working fluid 1 inside.
The heat collecting unit 4 having the number 0 is formed by molding with resin 11. The heat collecting unit 4 is made of ceramic, fiber reinforced plastic, or the like. Can metal be used? If metal is used, it should be constructed so that no loops are formed and it should be grounded. As the resin 11, silicone rubber or urethane resin having good heat resistance and impact resistance is used. When using the same resin as the resin 7 of the low-voltage coil 3 and the resin 9 of the high-voltage coil 5, an impact-resistant buffer layer is provided on the outside of the resin 11 of the heat collection unit 4. As the working fluid 10, air, vegetable oil, fluorocarbon-based medium, water containing higher alcohol, or higher alcohol is used.

The following describes a system in which heat generated by a transformer is absorbed and discharged by a heat collection unit. As shown in Figure 4,
An external heat collection unit 1 in which a heat collection unit (not shown) in the winding 2 is disposed between the windings 2 with a heat collection unit connecting pipe 12
3 and a heat exchanger 15 via a circulation pump 14 in a closed structure.

The working fluid 10 is circulated to carry the heat inside the winding 2, and the heat exchanger 15 exchanges the heat with the cooled working fluid IO.
is circulated through the heat collection unit to continuously transport heat. The heat exchange element 16 of the heat exchanger 15 exchanges heat using the heat storage material 18 circulated by the pump 17, and the heat storage tank 1
9 stores energy. The heat storage material 18 is diphenyl ether, terphenyl, paraffin, and stearic acid.

Select and use one suitable for the method of utilizing the recovered heat, such as zinc chloride hydrate. By using the heat exchange element 20, circulation pump 21, and valve 22 in the heat storage tank 19, thermal energy can be used effectively. In addition, when releasing heat to the outside where the transformer is installed, the working fluid 10
Use air to flow in a fixed direction. Furthermore, when the load fluctuation is large, the circulation pump 14 is operated when necessary at a constant load rate or higher.

As described above, according to this embodiment, the heat collection unit, heat exchanger, and heat storage tank disposed between the gaps and windings of the low-voltage coil and the high-voltage coil are connected by the heat collection unit connecting pipe, and the heat collection unit is operated. Since the coils of the transformer are moved to the outside using fluid as a medium, the performance of the transformer is not degraded and burnout accidents can be prevented.Furthermore, since no fan is installed below the windings, the transformer can be made smaller and lighter. It becomes possible. Furthermore, since the waste heat of the transformer can be effectively used, overall efficiency can be improved.

Effects of the Invention As is clear from the above description of the embodiments, the present invention reliably cools the transformer by connecting a heat collection unit, a heat exchanger, and a heat storage tank arranged between mutually adjacent coils. Accordingly, it is possible to realize an excellent transformer that does not deteriorate performance due to heat exchange and makes effective use of waste heat.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view showing the configuration of the winding of a transformer according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line AA' in Fig. 1, and Fig. 3 shows the main parts of the transformer. FIG. 4 is an explanatory diagram showing the configuration of a transformer, a heat exchanger, and a heat storage device according to an embodiment of the present invention. 3...Low pressure coil, 4...Heat collection unit, 5...High voltage coil, 10...Working fluid, 12...Heat collection Unit connecting pipe, 13...
...External heat collection unit, 15... Heat exchanger, 16... Heat exchange element, 18...
- Heat storage material, 19... Heat storage tank.

Claims (3)

[Claims] (1) A transformer equipped with a heat collection unit disposed in a gap between adjacent coils and a heat collection unit connecting pipe connected to a heat exchanger. (2) The transformer according to claim 1, further comprising a heat exchanger and a heat storage tank. (3) The transformer according to claim 1, wherein gas is allowed to flow into the heat collection unit.