JP2006049841A - Transformer system to be set on the road - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To respond to further capacity increase of a transformer while maintaining the size of an outer casing of a transformer system to be set on the road. <P>SOLUTION: A transformer tank 3 accomodating the transformer 1 is disposed in the outer casing 2. The casing 2 is provided with ventilation holes 6b and 7 for releasing heat from the transformer 1. When the capacity of the transformer 1 is increased with the size of the outer casing 2 maintained, the heat radiation area of the transformer tank 3 is reduced in so far as the surface temperature of a ceiling board 6 of the outer casing 2 and the temperature of discharge air from the ventilation hole 6b provided in the ceiling board 6 of the outer casing 2 do not exceed predetermined values. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a road-mounted transformer device adapted to further increase the capacity of a transformer.

  In the conventional road-mounted transformer device, for example, as shown in FIGS. 4 and 5, the transformer 1 is disposed in the outer box 2 together with a switch or the like (not shown). The transformer 1 is configured such that a transformer body (not shown) is accommodated in a transformer tank 3 together with insulating oil. A radiator 4 is attached to the side surface of the transformer tank 3. The outer box 2 is composed of a side wall cylinder 5 that forms a square cylinder shape with the wide surfaces 5a and 5b facing each other and the narrow surfaces 5c and 5d facing each other, and a ceiling plate 6 that is attached so as to close the upper opening of the side wall cylinder 5. Has been. The wide surfaces 5a and 5b and the narrow surface 5c are provided with a plurality of vents 7 made of louvers for releasing heat from the transformer 1, and the vents 7 are arranged so as to be inclined downward. On the periphery of the ceiling plate 6, a flange 6 a is provided downward, and is fitted to the upper end portion of the side wall cylinder 5 and fixed by screws or the like. The ceiling plate 6 is provided with a plurality of lifting bolt holes 8.

  As shown in FIG. 6, the radiator 4 (4 a, 4 b, 4 c) is attached to the other three side plates 3 a, 3 b, and 3 c other than the one side plate 3 d of the transformer tank 3. For example, corrugation processing is performed over almost the entire steel plate constituting the side plate 3a, side plate 3b, and side plate 3c of the transformer tank 3, and a large number of radiating fins 4a1, 4b1 and 4c1 are formed, and the radiators 4a, 4b, and 4c are constituted by these radiation fins, respectively. The side plate 3d does not have a radiator because a switch or the like is attached here.

  The dimensions of the oil passage spacing, number, height, and length (vertical direction) of the radiating fins 4a1, 4b1 and 4c1, the pitch between the ridges of the radiating fin, the ridge spacing, and the spacing between the ridge top and the outer box 2 It is an appropriate value, and the distance between the peak portion and the outer box 2 is made as small as possible, and the length (vertical direction) is made as large as possible.

  In such a road-mounted transformer device, the hot air from the transformer 1 is discharged to the outside from the vent 7 provided in the side wall cylinder 5 of the outer box 2.

  By the way, in recent years, with increasing demand for electric power in urban areas, and in order to meet the needs for cost reduction of facilities, it is required to increase the transformer capacity of a road-mounted transformer device.

  On the other hand, for road-mounted transformer devices, strict restrictions are imposed on the external dimensions according to local government regulations, so that the transformer capacity is increased while the size of the outer box 2 is maintained. It will be necessary.

  As described above, in the on-road type transformer device in which the capacity of the transformer is increased while the size of the outer box 2 is maintained, the air vent 7 of the outer box 2 is increased as the amount of heat generated from the transformer 1 increases. The temperature of the ceiling panel 6 rises due to the hot air that has risen without being released from the air, and the temperature rise limit that does not cause harm such as burns even if a person touches it directly (for example, according to JEAC 7001-1999 125-9 (2), The limit of the surface temperature of the outer box 2 where there is a possibility of human contact is defined to be a predetermined value (80 ° C.) or less, and exhaust air exhausted from the vent 7 of the outer box 2 from the power company. The temperature is said to conform to that.)

In order to avoid this problem, as shown in FIG. 7, the ceiling plate 6 of the outer box 2 is provided with a vent 6b. The vent 6b is formed by a space formed by the wide surface 5a of the outer box 2 and the side plate 3a of the transformer tank 3 shown in FIG. 6, and by the wide surface 5b of the outer box 2 and the side plate 3b of the transformer tank 3. A plurality of spaces are provided in the form of a U-shape when viewed from above in a state of being positioned above each space and the space formed by the narrow surface 5c of the outer box 2 and the side plate 3c of the transformer tank 3. (See Patent Document 1).
Japanese Patent Laying-Open No. 2004-80836 (FIG. 6)

  In contrast to the above-mentioned road-mounted transformer device, it is required to further increase the transformer capacity while maintaining the size of the outer box 2. There is a problem that one or both of the surface temperature of the ceiling plate 6 of the box 2 and the exhaust temperature of the outer box 2 exhausted from the vent 6b, for example, exceed the predetermined value.

  An object of the present invention is to provide a road-mounted transformer device adapted to further increase the capacity of a transformer while maintaining the size of the outer box.

  The first invention is directed to a road-mounted transformer device in which a transformer tank containing a transformer is arranged in an outer box, and a vent hole for releasing heat from the transformer is provided in the outer box. The heat dissipation area of the transformer tank should be set so that the surface temperature of the outer box and the exhaust temperature exhausted from the outer box do not exceed the specified value against the increase in the capacity of the transformer while maintaining the size of the outer box. It is a reduced configuration.

  In the second invention, a transformer is constructed by increasing the heat resistance of the insulating material.

  As described above, according to the first invention, by reducing the heat radiation area of the transformer tank, the amount of heat released from the heat sink is reduced, and the space formed by the outer box and the transformer tank is expanded, Since the resistance to the air flow rising in this space is reduced, the air flow becomes faster, and the amount of air sucked from the vent hole provided in the side wall cylinder of the outer box increases, so that the outer box The rise in the surface temperature is reduced, the rise in the exhaust temperature exhausted from the outer box is reduced, and the surface temperature of the outer box and the exhaust temperature exhausted from the outer box keep a predetermined value while maintaining the size of the outer box. It can be made not to exceed.

  According to the second invention, it is possible to cope with further increase in capacity of the transformer by increasing the heat resistance of the insulating material used in the transformer.

  FIG. 1 is a schematic top view showing a first embodiment of a road-mounted transformer device according to the present invention, and shows an internal structure after removing the ceiling plate 6 of the outer box 2 shown in FIG.

  In the state where the size of the outer box 2 is maintained, the same vent 7 (not shown) as FIG. 4 and the same vent 6b (not shown) as FIG. 7 are provided to further increase the transformer capacity, for example, When increasing from 250 kVA to 300 kVA, as shown in the figure, in this embodiment, the heat radiation area of the radiator 4 (4a, 4b, 4c) provided in the transformer 1 is reduced, and the surface temperature of the outer box 2 and the outer box 2 are reduced. In order to lower the exhaust temperature further exhausted, the oil passage spacing, number, length (vertical direction) of the radiating fins 4a1, 4b1 and 4c1 and the pitch dimension between the ridges of the radiating fins are all shown in FIG. Only the height a dimension is changed. For example, the pitch b between the ridges of the radiating fin is 48.8 mm and the crest interval c42.4 mm, and the height a is reduced by about 40% compared to the conventional case. . That is, conventionally, for example, the height a is 40 mm (the distance d between the outer box 2 and the peak portion is 3.6 mm), whereas in the present embodiment, the height a is 25 mm (the outer box 2 and the peak portion). Was set to 18.6 mm).

  In such a configuration, the amount of heat released from the radiator 4 is reduced, and the space formed by the outer box 2 and the transformer tank 3 is widened, and the resistance to the flow of air rising in this space is reduced. Since the flow of air becomes faster and the amount of air sucked from the vent hole 7 provided in the side wall cylinder 5 of the outer box 2 increases, the surface temperature of the ceiling plate 6 (not shown) of the outer box 2 and the like Although the exhaust temperature exhausted from, for example, the vent 6b (not shown) of the outer box 2 is equal to or lower than a predetermined value (80 ° C.), a heat source is confined in the transformer case 3, so that the transformer 1 It is necessary to increase the heat resistance of the insulating material used, for example, the insulating oil filled in the transformer tank 3 and the insulating material used for the windings constituting the transformer 1. In this case, the insulating oil is changed from mineral oil to silicon oil, and the insulating material is changed in its heat resistance class from F type to H type.

  FIG. 2 is a schematic top view showing a second embodiment of the on-road transformer device according to the present invention, and shows the internal structure of the outer box 2 shown in FIG. 4 with the ceiling plate 6 removed.

  While maintaining the size of the outer box 2, the same vent 7 (not shown) as in FIG. 4 and the same vent 6b (not shown) as in FIG. 7 are provided, and the transformer capacity is increased from 250 kVA to 300 kVA. In the case of increasing, as shown in the figure, in this embodiment, in order to reduce the heat radiation area of the radiator 4 provided in the transformer 1 and to reduce the surface temperature of the outer box 2 and the exhaust temperature exhausted from the outer box 2. The oil passage interval, length (vertical direction), and height of the radiating fins 4a1, 4b1 and 4c1 are all the same as in FIG. 6 showing the conventional one, and only the pitch b between the peaks is changed. The height a of the fin was set to 40 mm (the distance d between the outer box 2 and the top of the ridge was 3.6 mm), and the pitch b between the ridges was doubled compared to the conventional case. That is, in the related art, for example, the pitch b between ridges is 48.8 mm, whereas in this embodiment, the pitch b between ridges is 97.6 mm.

  In such a configuration, the amount of heat released from the radiator 4 is reduced, and the space formed by the outer box 2 and the transformer tank 3 is widened, and the resistance to the flow of air rising in this space is reduced. Since the air flow becomes faster and the amount of air sucked from the vent hole 7 provided in the side wall cylinder 5 of the outer box 2 increases, the surface temperature of the ceiling plate 6 (not shown) of the outer box 2 and the outside Although the exhaust temperature exhausted from the vent 6b (not shown) of the box 2 is equal to or lower than a predetermined value (80 ° C.), the heat source is confined in the transformer case 3, so that other than insulating oil and insulating oil It is necessary to increase the heat resistance of the insulating material. In this case, the insulating oil is changed from mineral oil to silicon oil, and the insulating material is changed in its heat resistance class from F type to H type.

  FIG. 3 is a partial longitudinal sectional view showing a third embodiment of the road-mounted transformer device according to the present invention, and corresponds to FIG.

  While maintaining the size of the outer box 2, the same vent 7 (not shown) as in FIG. 4 and the same vent 6b (not shown) as in FIG. 7 are provided, and the transformer capacity is increased from 250 kVA to 300 kVA. In the case of increasing, as shown in the figure, in the present embodiment, the heat radiation area of the radiator 4 provided in the transformer 1 is reduced to reduce the surface temperature of the outer box 2 and the exhaust temperature exhausted from the outer box 2. In addition, the oil passage interval, number, height, and pitch between the radiating fins 4a1, 4b1 are the same as in FIG. 6 showing the conventional one, and only the length (vertical direction) e is changed. For example, the height a of the radiating fin is 40 mm, the pitch b between the peaks is 48.8 mm, and the length e is about ½ that of the conventional case. That is, the length e is 98 cm in the prior art, whereas the length is 50 cm in the present embodiment. In addition, the arrangement | positioning of this radiation fin was set to the upper side.

  In such a configuration, the amount of heat released from the radiator 4 is reduced, and the space formed by the outer box 2 and the transformer tank 3 is widened, and the resistance to the flow of air rising in this space is reduced. Since the air flow becomes faster and the amount of air sucked from the vent hole 7 provided in the side wall cylinder 5 of the outer box 2 increases, the surface temperature of the ceiling plate 6 (not shown) of the outer box 2 and the outside Although the exhaust temperature exhausted from the vent 6b (not shown) of the box 2 is equal to or lower than a predetermined value (80 ° C.), the heat source is confined in the transformer case 3, so that other than insulating oil and insulating oil It is necessary to increase the heat resistance of the insulating material. In this case, the insulating oil is changed from mineral oil to silicon oil, and the insulating material is changed in its heat resistance class from F type to H type.

  In each of the above embodiments, the insulating oil is changed from mineral oil to silicon oil, and the insulating material is changed in its heat resistance class from F type to H type, but depending on the degree of increase in transformer capacity, the insulating oil and the insulating material It may not be necessary to increase the heat resistance of the.

  Further, depending on the degree of increase in the transformer capacity, the surface temperature of the ceiling plate 6 (not shown) of the outer box 2 and the exhaust temperature exhausted from the vent 6b (not shown) of the outer box 2 are predetermined values. In the case of exceeding (80 ° C.), it is necessary to further reduce the amount of heat released from the radiator 4, so that the first to third embodiments are appropriately combined or the radiator 4 is not provided. In this case, it is necessary to increase the heat resistance of the insulating material.

It is a schematic top view which shows Embodiment 1 of the on-road installation type transformer apparatus concerning this invention. It is a schematic top view which shows Embodiment 2 of the on-road installation type transformer apparatus concerning this invention. It is a partial longitudinal cross-sectional view which shows Embodiment 3 of the road installation type transformer apparatus concerning this invention. It is a perspective view of the conventional road-mounted transformer device. It is a partial longitudinal cross-sectional view of FIG. It is a schematic top view which removes the ceiling board of the outer box shown by FIG. 4, and shows the structure of the inside. It is a schematic top view of the conventional road installation type transformer apparatus which provided the vent in the ceiling board of the outer box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transformer 2 Outer box 3 Transformer tank 4 Radiator 6 Ceiling board 6b Ventilation hole 7 Ventilation hole

Claims (2)

In the on-road type transformer device in which a transformer tank containing a transformer is arranged in an outer box, and a vent hole for releasing heat from the transformer is provided in the outer box,
The transformer tank so that the surface temperature of the outer box and the exhaust temperature exhausted from the outer box do not exceed a predetermined value as the capacity of the transformer increases while maintaining the size of the outer box. Road-mounted transformer device configured with reduced heat dissipation area. The road-mounted transformer device according to claim 1, wherein the transformer is configured by increasing heat resistance of an insulating material.

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