JP3327142B2 - Oil-filled electromagnetic induction equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled electromagnetic induction device having a conservator.

[0002]

2. Description of the Related Art FIG. 4 is a front view and a side view of a configuration of an oil-filled electrical device described in, for example, Japanese Utility Model Application Laid-Open No. 5-13020 as applied to an electromagnetic induction device to which the present invention is applied. . In the drawing, reference numeral 1 denotes a coil, 2 denotes an iron core having a magnetic circuit forming a closed circuit and having a coil 1 wound at a predetermined position, and 3 denotes a terminal for connecting the coil 1 to an external electric circuit, a porcelain insulator, and the like. A bushing, 4 is a connection conductor for connecting the coil 1 and the bushing 3, 5 and 6 are a tank and a cover for storing the electromagnetic induction device main body such as the coil 1 and the iron core 2, 7 is a bushing storage box, and 8 is a radiator. It is. An insulating oil 9 is sealed inside the tank 5, the bushing storage box 7, and the radiator 8. 10 'is a conservator provided on the bushing storage box 7.
10a is a mounting leg for fixing the conservator 10 'to the support 6a on the cover side, and 11 is a communicating pipe connecting the bushing storage box 7 and the conservator 10'. The connection conductor 4 connects the coil 1 and the bushing 3 at an interval substantially equal to the interval of the bushing 3 for each phase.

Next, the operation will be described. The coil 1, the iron core 2, the bushing 3 side of the electromagnetic induction device main body, and the connection conductor 4 are immersed in insulating oil 9 as a medium for insulation and cooling. Expands due to the rise in temperature, and contracts when the temperature decreases. The conservator 10 'is provided for the purpose of absorbing a volume change due to a temperature change of the insulating oil 9.
The volume change of the insulating oil 9 moves between the tank 5 and the conservator 10 'through a communication pipe 11' connecting the upper part of the bushing storage box 7 on the electromagnetic induction device main body side and the conservator 10 '. Note that heat loss such as Joule loss in the iron core is released from the radiator 8 to the outside.

[0004]

Since the conventional oil-filled electromagnetic induction apparatus is constructed as described above, both the occupied area and the height are large and the structure is complicated. Furthermore, when accurate impedance is required like a reactor, the impedance at the connection conductor portion of each phase becomes a non-negligible value, and it is necessary to accurately compensate for the coil and the iron core side, thereby limiting the manufacturing method. is there. The present invention has been made to solve the above-described problems, and has an object to provide a more economical oil-filled electromagnetic induction device with a simplified structure and a reduced size.

[0005]

The oil-filled electromagnetic induction device according to the present invention comprises: an iron core; a coil wound around the iron core;
A tank containing an iron core and a coil and filled with insulating oil inside the tank, and a conservator that absorbs a volume change due to a temperature change of the insulating oil in the tank through a communication pipe are provided. A bushing having a terminal to be connected is mounted, and the inside of a communication pipe connecting the conservator and the tank is penetrated by a connection conductor connecting the coil and the bushing. Further, connection conductors having different potentials are arranged adjacent to each other inside the communication pipe. Furthermore, a radiator having a connection port is provided between the tank and the conservator.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oil-filled electromagnetic induction device according to the present invention will be described below with reference to the drawings. The reference numerals used in the respective drawings are the same as or corresponding to those of the conventional electromagnetic induction device described with reference to FIG. 4, and the repeated description thereof is omitted.

An embodiment of an oil-filled electromagnetic induction device according to the present invention will be described below with reference to FIG. In the figure, reference numeral 10 denotes a conservator to which a bushing 3 is attached, and 11 denotes a communication pipe in which a plurality of connection conductors 4 are brought close to each other and penetrate therethrough. Of course, the volume change of the insulating oil also moves between the tank 5 and the conservator 7 through the communication pipe 11.

As described above, since the bushing 3 is attached to the conservator 10 and the lead 4 penetrates through the inside of the communication pipe 11 so as to be close to each other, the conservator 10 is supported by the communication pipe 11 itself. The structure of the upper part of the tank can be made simple and compact, including what can be done. By arranging the connection conductors 4 of each phase close to each other, the inductance of the relevant portion can be canceled out, which is particularly advantageous in a reactor. If the connecting conductors penetrating through one communication tube 11 are arranged by twisting each other, the effect of canceling the inductance is further increased, which is more effective. Although the bushing 3 using a porcelain insulator has been described as being attached to the conservator 10, a bushing using a cast insulating plate or the like may be used instead of the bushing using a porcelain insulator. Of course, it is needless to say that the same effect can be obtained structurally even if the connecting conductor 4 is configured to penetrate the independent communication pipe 11 for each phase.

In the oil-filled electromagnetic induction device shown in FIG. 1, both the connection ports of the radiator 8 and the electromagnetic induction device main body side are connected to the tank 5.
However, if one of the connection ports is attached to the conservator 10 as shown in FIG. 2, the dimension of the radiator 8 in the height direction can be increased. Since the heat radiation area of the heat radiation tube increases, the number of heat radiation tubes can be reduced. One of the connection ports of the radiator 8 with the electromagnetic induction device main body side may be provided on the cover 6. FIG. 3 shows such a configuration.

[0010]

The oil-filled electromagnetic induction device according to the present invention comprises an iron core, a coil wound around the iron core, a tank containing the iron core and the coil and enclosing insulating oil therein, and an insulating member in the tank. It has a conservator that absorbs the volume change due to the oil temperature change through the communication pipe.A bushing with a terminal that connects to the external electric circuit is attached to the conservator, and the inside of the communication pipe that connects the conservator and the tank is coiled. Since the connection conductor connecting between the and the bushing is penetrated, the structure of the upper part of the tank can be made simple and small.

In addition, since the connecting conductors having different potentials are arranged adjacent to each other inside the communication pipe, the inductance of the portion can be canceled.

Further, since a radiator having a connection port is provided between the tank and the conservator, the dimension of the radiator in the height direction can be increased, and the number of radiator tubes can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a front side and a side showing a configuration of an embodiment of an oil-filled electromagnetic induction device according to the present invention.

FIG. 2 is a side sectional view showing a modified example of the oil-filled electromagnetic induction device according to the present invention.

FIG. 3 is a side sectional view showing another modification of the oil-filled electromagnetic induction device according to the present invention.

FIG. 4 is a front view and a side view showing a configuration of a conventional oil-filled electromagnetic induction device.

[Explanation of symbols]

1 coil 2 iron core 3 bushing
4 Connection conductor 5 Tank 8 Radiator 10 Conservator
11 Communication pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 55-122322 (JP, U) Japanese Utility Model Sho 55-124825 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H01F 27/14 H01F 27/04

Claims (2)

(57) [Claims] 1. An iron core, a coil wound around the iron core, a tank accommodating the iron core and the coil and enclosing insulating oil therein, and a volume change due to a temperature change of the insulating oil in the tank. An oil-introduced electromagnetic induction device having a conservator that absorbs through a communication pipe, wherein a bushing having a terminal connected to an external electric circuit is attached to the conservator and the communication pipe connects the conservator and the tank. was through the connection conductor connecting between said bushing and said coil, said connecting conductors having different potentials in the interior of the communicating pipe
Are arranged adjacent to each other . 2. An iron core, a coil wound around the iron core, a tank accommodating the iron core and the coil and enclosing insulating oil therein, and a volume change due to a temperature change of the insulating oil in the tank. An oil-introduced electromagnetic induction device having a conservator that absorbs through a communication pipe, wherein a bushing having a terminal connected to an external electric circuit is attached to the conservator and the communication pipe connects the conservator and the tank. was through the connection conductor connecting between said bushing and said coil, radiator having a connection port to said conservator and the tank
Oil-filled electromagnetic induction equipment characterized by having a vessel .