JPS6311908Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Technical Field The present invention relates to an improvement of a DC power supply device that receives AC power and supplies DC power.

Generally, in order to obtain a DC power source, a DC power supply device is used that includes a transformer that adjusts the voltage to a predetermined voltage and a rectifier that converts AC to DC. The present invention relates to an improvement in housing a transformer and a rectifier in one container.

b. Explanation of the prior art Generally, when obtaining a large current DC power source, a transformer is used to receive the high voltage AC power and transform it into a low voltage AC voltage commensurate with the DC output voltage, and to receive the transformed AC power, It consists of a rectifier that converts power to direct current. These transformers and rectifiers have independent structures.

On the other hand, the cooling method and structure are determined based on various conditions such as cooling of the heat generated during co-operation of the transformer and rectifier, electrical insulation, maintainability, and installation conditions.

The present invention describes an oil-immersed DC power supply device in which both a transformer and a rectifier are housed in the same container. FIG. 1 shows an example of a conventional device. A transformer 1 receives AC power and transforms it to a predetermined voltage. A transformer 2 is a rectifier using a semiconductor rectifying element that receives the transformed power and converts AC into DC. Although not shown, the transformer 1 stores a transformer section and an insulating oil for cooling and insulating the transformer section in a container 3. A primary bushing 4 for receiving power and a secondary bushing 5 for supplying power to the rectifier are attached to the top surface of the container 3, and a radiator 6 for cooling the insulating oil is attached to the side surface according to the capacity. The one shown is an oil-immersed self-cooling type, but in the case of a forced circulation type, a circulation pump is installed between the radiator 6 and the container 3 to forcibly circulate the insulating oil. Ru.

On the other hand, the rectifier 2 contains in a container 7 (not shown) circuit components for a rectifier using semiconductor rectifying elements for converting alternating current into direct current, and insulating oil for cooling and insulation.

An AC side bushing 8 for receiving power from the transformer and a DC side bushing 9 for outputting DC power are attached to the top surface of the container 7, and a radiator 10 for cooling the insulating oil is installed on the side according to the capacity. It is installed. The illustrated case is of an oil-immersed self-cooling type, but in the case of a forced circulation type, a circulation pump is provided between the radiator 10 and the container 7 in the same way as a transformer. Although not shown in the main text, accessories and devices necessary for the transformer and rectifier, such as a thermometer, respiratory oil level valve, pressure relief valve, and oil drain valve, are included.

When installing the transformer 1 and the rectifier 2 in a specified location to form a DC power supply, the secondary bushing 5 of the transformer 1 and the rectifier 2 must be installed after each foundation is installed, since each is an independent device. The AC side bushing 8 must be connected with a conductor or cable. Since the current value in this portion is generally low voltage, its capacity (size) is also large. Also, transformer 1,
Since bushings 5 and 8 must be provided in both rectifiers 2, the area of the top surface of the container is determined by the restrictions on the arrangement of the bushings, and the size determined by the capacities of the transformer and rectifier, whichever is larger. There must be. Therefore, if the size is determined by the restrictions on bushing installation, the container will be large, which not only reduces the economic efficiency of the transformer and rectifier itself, but also reduces the installation area, the material of the connecting wire between the transformer and the rectifier, and the installation work. It also hurts economic efficiency. This is particularly noticeable in the case of devices containing multiple circuits. For example, if two transformers and two rectifiers are provided to form a 12-phase rectifier circuit, the number of bushings 5 and 8 shown in the figure will be doubled.

c. Purpose of the invention The purpose of this invention was to eliminate the above-mentioned drawbacks, namely, to house the transformer and rectifier in one container instead of making them independent, thereby reducing the size of the equipment itself. The present invention aims to provide an economical DC power supply device that is not only compact but also has a small installation area and easy installation work.

d Structure of the invention Fig. 2 is a bird's-eye view of an embodiment of the invention, and Fig. 3 is a cross-sectional view of Fig. 2 (cross section - of Fig. 2).

The same parts as those in the conventional device are given the same reference numerals, so the explanation will be omitted.

In FIG. 2, the oil-immersed DC power supply 11 houses a transformer part and a rectifier part, which will be described later, inside a container 12, and a primary bushing 4 and a DC side bushing 9 are attached to the top surface. Lid 1 in the center
3 is provided. Further, radiators 6 and 10 for transformers and rectifiers are provided on the side surfaces, respectively, depending on the capacity.

In FIG. 3, the interior of the container 12 has a height slightly higher than the level of oil supply required by the transformer section and the rectifier section, except for the entire or part of the top surface, and the container 12 has a height slightly higher than the level of the amount of oil required for the transformer section and the rectifier section, and the side and bottom portions of the container 12. and an oil-tight structure, such as a welded partition plate.

The partition plates 12A and 12B are attached to the center of the container 12 at an interval of approximately 5 to 10 cm to provide a heating chamber 12C. A winding assembly 14 is housed in the transformer section and a stack assembly 15 is housed in the rectifier section on the left and right sides of the heat shielding chamber 12C.

The winding assembly 14 has a secondary terminal 16 and a primary lead wire 17 connected to the primary bushing 4. On the other hand, the stack assembly 15 consists of a rectifying element stack 18 using semiconductor rectifying elements in a predetermined circuit, and has a main circuit connection provided with a surge absorber (not shown), and an AC side terminal 19 and a DC side terminal. It is equipped with 20. A connecting conductor 21 connects the DC bushing 9 and the DC side terminal 20 of the stack assembly 15. The method of connection between the transformer section and the rectifier section is to connect the connection strip 2 between the secondary side terminal 16 of the winding assembly 14 and the AC side terminal 19 of the stack assembly 15.
2 in the upper space of the heat chamber 25.

The lid 13 is attached to the container 12 in order to perform this connection.
It is used to close the opening for work provided on the top surface of the unit.

Incidentally, independent insulating oils 23 and 24 are injected into the transformer section and the rectifier section, respectively.

e. Effect of the invention By accommodating the transformer section and the rectifier section in the same container as described above, when AC current is received by the primary bushing 4, DC power is output from the DC side bushing 9.

It is not necessary to make the connection between the transformer and the rectifier outside the container as in the past. Further, the reason why the transformer section and the rectifier section are placed in a chamber separated by the heat-resistant chamber 12C and the insulating oil is made independent is as follows.

1. Since the primary voltage of a transformer is generally high, the insulating oil is required to have higher insulation properties than the rectifier part. Therefore, it is better to separate them for maintenance and management purposes.

2 The temperature control values of insulating oil are different for transformers and rectifiers. In other words, the insulating oil in the transformer section is higher than that in the rectifier section, where the semiconductor rectifying elements must be actively cooled. (Generally, there is a difference of about 20°C.) Therefore, considering the economics of downsizing the equipment, it is better to keep the insulating oil independent, but heat conduction is better than using a single plate. It is better to have a heat-proof room with a bad space.

3. In the unlikely event that an internal accident occurs, it is better to separate the rooms with partition plates to prevent the spread of damage.

g Effect As explained above, one container is internally divided into three chambers using partition plates, and the rectifier section and transformer section are housed at both ends, and the insulating oil is also separated from each other in the central heating chamber. This not only makes it possible to downsize the equipment without sacrificing conventional performance (eliminating the need for secondary bushings on transformers and AC side bushings on rectifiers), it also reduces the installation area and makes installation work easier. It is possible to provide a DC power supply device.

[Brief explanation of drawings]

FIG. 1 is a bird's-eye view of a conventional DC power supply, FIG. 2 is a bird's-eye view of a DC power supply showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the DC power supply shown in FIG. The cross section of the figure is -). 1... Transformer, 2... Rectifier, 3... Container, 4
...Primary bushing, 5...Secondary bushing, 6
... Heat radiator, 7 ... Container, 8 ... AC side bushing, 9 ... DC side bushing, 10 ... Heat radiator,
11...DC power supply device, 12...Container, 12A...
...Partition plate, 12B...Partition plate, 12C...Heating chamber, 13...Lid, 14...Winding assembly, 15...
...Stack assembly, 16...Secondary side terminal, 17...
Primary side lead wire, 18... Rectifying element stack, 1
9...AC side terminal, 20...DC side terminal, 21...
... Connection conductive band, 22 ... Connection band, 23 ... Insulating oil,
24...Insulating oil.

Claims (1)

[Scope of utility model registration request] In an oil-immersed DC power supply device in which a transformer part that transforms the voltage of an AC power supply and a rectifier part that receives the transformed AC power and converts the AC into DC are housed in one container, there is a container inside the container except for the upper part. Then, two oil-tight partition plates were installed on the sides and bottom to create three chambers.The transformer and rectifier sections were housed at both ends of the left and right chambers, and a heat shielding chamber was placed in the center. A DC power supply device characterized by: