JPH06140258A - Stationary induction equipment winding - Google Patents

Abstract

PURPOSE:To enable a stationary induction equipment winding to cope with a stationary induction equipment of high voltage and large capacity and the stationary induction equipment to be delivered as it is disassembled by a method wherein one or more materials such as insulating oil, grease, silicone gel or the like are filled into a easing, an insulated conductor constituting a winding main body is formed to be partially or wholly hollow, and cooling medium is made to circulate inside the hollow insulated conductor. CONSTITUTION:A winding main body 8 is housed in a cylindrical easing 9, one or more materials selected from liquid low in viscosity such as insulating oil, grease high in viscosity, and silicone gel are filled into the easing 9. An insulated conductor constituting the winding main body 8 is formed to be partially or wholly hollow, and cooling medium is made to circulate inside a hollow insulated conductor 7. Cooling medium is made to circulate forcibly through the hollow insulated conductor 7 by a pump 10 provided to a part of the conductor 7. Generally, as a cooler 6 and the pump 10 are kept at a ground potential, a conduit 5 is partially or wholly formed of insulated tube, and perfluorocarbon or the like is used as insulating liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding wire for a static induction device such as a transformer or a reactor.

[0002]

2. Description of the Related Art In recent years, in response to an increase in the demand for electric power in urban areas, electric power equipment is often installed in buildings and underground electric rooms. Power equipment installed in such a place,
In particular, large equipment such as transformers are required to have flame retardancy from the viewpoint of disaster prevention.

In order to meet such demands, a mold transformer in which a winding body is molded with epoxy resin or the like, and a gas-insulated transformer in which SF ₆ gas is enclosed in a tank containing the contents of the equipment have been put into practical use. It was

However, the applicable voltage of the molded transformer is limited to at most 33 kV class or less because the main body of its insulation depends on air, and the cooling of the equipment is also restricted by air, so the cooling performance is limited. Therefore, even with forced cooling using a blower, about 10000 kVA is the upper limit of the applicable capacity.

In addition, in the gas-insulated transformer, the main body of insulation is SF.
_Since it is a gas with a high insulating property such as ₆ , it can be applied to higher voltages and even 275 kV class gas has already been put to practical use. However, when gas is used as the cooling medium, the cooling performance is lower than that of the conventional oil-filled transformer, so measures such as reducing the current density of the windings to suppress the amount of heat generated are required, and the equipment is large. It tended to take shape.

[0006] On the other hand, underground is soaring in urban areas, and there are severe restrictions on transportation in buildings and underground electric rooms, and downsizing and downsizing of equipment is a top priority issue. Above all, improvement of cooling performance of windings is required. Strongly desired. In order to solve such a problem, the following cooling means have been proposed or put into practical use mainly in gas-insulated transformers.

First, there is a method called a semi-pool type, which is described, for example, in Japanese Utility Model Publication No. 3-2615.
An example of a semi-pool type structure is shown in FIG. In the figure, the iron core 2 and the winding body 3 are housed in a tank 1 filled with an insulating gas such as SF ₆ , and the winding body 3 is housed in an insulating container 4 filled with an insulating cooling medium. Has been done.
The winding body 3 is cooled by a cooling medium that circulates in the insulating container 4, and the cooling medium that has cooled the winding body 3 is guided to the outside of the tank 1 through the conduit 5 and cooled by the cooler 6.

In Japanese Patent Laid-Open No. 60-257503, the method shown in FIG. 3 is adopted. That is, in FIG. 3, the iron core 2 and the winding main body 3 are housed in a tank 1 in which an insulating gas such as SF ₆ is filled, which is similar to the semi-pool type, but as a winding conductor as shown in FIG. Using the hollow insulated conductor 7, the hollow insulated conductor 7 is wound to form the winding body 3 as shown in FIG. 5, and the conduits 5 are connected to both ends thereof. The hollow insulated conductor 7 is filled with a cooling medium, guided to the outside of the tank by the conduit 5, and cooled by the cooler.

[0009]

In the conventional method described above, the main insulating material is the insulating gas such as SF ₆ , and the insulating gas is sealed in the tank 1. That is, the tank 1 is an essential element that constitutes the device. For this reason, for example, there is a severe restriction on the carry-in to the installation place, and even if the device is disassembled and carried in, the tank 1 remains as the largest component and cannot be disassembled if the size is smaller than that.

In the case of a mold transformer, there is no tank that is a restriction on disassembly, and since it can be disassembled into windings and iron cores, it has the advantage that it can be used even when the carry-in restriction is extremely strict. The applicable voltage and capacity are limited as described above. The present invention has been made in view of the above circumstances, and provides a winding wire for a static induction device that can cope with high voltage and large capacity and is suitable for disassembly and loading.

[0011]

According to the present invention, in order to achieve the above object, a winding body is housed in a cylindrical casing, and a low-viscosity liquid such as insulating oil or grease is contained in the casing. While filling one or more types of highly viscous liquids or gel-like substances such as silicone gel, the insulated conductor forming the winding body is partially or entirely hollow, and a cooling medium is provided inside the hollow insulated conductor. It is characterized by being circulated.

[0012]

In the winding for static induction equipment constructed as described above, the main body of insulation is insulating oil or liquid such as grease or gel substance such as silicone gel filled in the casing, Cooling will depend on the cooling medium in the hollow conductor. Therefore, the winding main body can be cooled with high efficiency, and the insulation strength of the winding is also increased, so that high voltage and large capacity can be supported. Further, the iron core can be disassembled from the casing and carried in.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a hollow insulated conductor 7 is filled with a cooling medium inside. Reference numeral 8 denotes a winding body formed by winding the hollow insulated conductor 7 and has a cylindrical casing 9
It is stored inside. For the purpose of insulation, the casing 9 is filled with one or more kinds of low-viscosity liquid such as insulating oil, high-viscosity liquid such as grease, or gel substance such as silicone gel. The winding thus constructed is cooled as follows.

First, the heat generated in the hollow insulated conductor 7 is transferred to the cooling medium filled in the hollow insulated conductor 7. The cooling medium is guided to the cooler 6 by the conduit 5 and cooled by the cooler 6. The cooling medium may be forcedly circulated by the pump 10 provided in the middle of the conduit 7.

As the hollow insulated conductor 5, a hollow insulated conductor may be used over the entire winding body, but for example, the hollow insulated conductor and the solid insulated conductor are wound in parallel, and the solid insulated conductor is cooled adjacently. It may be performed through a cooling medium in the hollow insulated conductor.

In general, since the cooler 6 and the pump 10 are at the ground potential, a part or the whole of the conduit 5 is an insulating tube, and an insulating liquid such as perfluorocarbon is used as the cooling medium.

Since the insulation is made by a liquid such as insulating oil or grease sealed in the casing 9 having excellent insulation properties or a gel substance such as silicone gel, it is applicable to a voltage far higher than the applicable range of the mode transformer. It is possible.

Next, in the case where there is a strict entry restriction such as in a building or an underground electric room, by removing the conduit 5 etc. from the winding, the equipment can be extended to the iron core and the winding as in the case of the molded transformer. It can be disassembled and brought in.

[0019]

As described above, according to the present invention, the winding body is housed in a cylindrical casing, and a low-viscosity liquid such as insulating oil or a high-viscosity liquid such as grease is stored in the casing. One or more types of gel substances such as silicone gel are filled, and some or all of the insulated conductors that make up the winding body are hollow, and the cooling medium is circulated inside the hollow insulated conductors. It is possible to provide a winding wire for a static induction device, which has a good insulation property, can be used in a high voltage range, and has a good cooling property, which can cope with a large capacity of the device, and which is also suitable for disassembly and loading.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

FIG. 3 is a sectional view showing another conventional example.

FIG. 4 is a cross-sectional view showing a hollow conductor used in the winding of FIG.

FIG. 5 is an explanatory diagram showing details of the winding wire shown in FIG. 3;

[Explanation of symbols]

2 is an iron core, 3 is a winding, 5 is a conduit, 6 is a cooler, 7 is a hollow insulated conductor, 8 is a winding body, 9 is a casing, and 10 is a pump.

Claims (4)

[Claims] 1. A winding main body is housed in a cylindrical casing, and a low-viscosity liquid such as insulating oil or a high-viscosity liquid such as grease or a gel substance such as silicone gel is contained in the casing. On the other hand, while winding the above, a part or all of the insulated conductor constituting the winding body is made hollow, and a cooling medium is circulated inside the hollow insulated conductor. 2. The winding for a static induction device according to claim 1, wherein the cooling medium is an insulating liquid. 3. The winding for a static induction device according to claim 1, wherein the cooling medium is forcedly circulated by means such as a pump. 4. The static induction device according to claim 1, wherein the winding body is composed of parallel conductors, and a hollow insulated conductor and a solid insulated conductor are used for these parallel conductors. For winding.