POWER RECEIVING EQUIPMENT

Abstract: A power receiving equipment has a power transformer fixed at the bottom to a base fixedly secured to a foundation, and connected to a leading-in line through a switchgear, and a steel tower vertically disposed on the foundation between the switchgear and the power transformer to support one end of the leading-in line drawn out from a transmission line or a buss. Alternatively the steel tower may be vertically disposed on the base through a mounting plate bolted to the latter between the switchgear and the power transformer.

Description: POWER RECEIVING EQUIPMENT This invention relates to improvements in a power receiving equipment disposed on a substation or the like. A conventional three-phase power receiving equipment of the type referred to has comprised a three-phase power transformer firmly secured to a base subsequently rigidly connected to a reinforced concrete foundation buried in the earth, three low voltage bushings horizontally drawn out from one side of the power transformer one for each phase of the system, a three-phase switchgear disposed in spaced relationship on the other side of the power transformer to be connected at one end to the power transformer and at the other end to a leading-in bushing erected on the other end portion of the switchgear with a part supported by the foundation through a supporting block. Then a steel tower has been vertically disposed on another reinforced cocrete foundation also buried in the earth to be spaced from the firstmentioned foundation. The steel tower has included a suspension insulator hung from a top portion thereof to connect a transmission line or bus to a leading-in line subsequently connected to the leading-in bushing. In operation, a three-phase high voltage power from the transmission line or bus has been supplied to the three-phase switchgear through the leading-in bushing and then introduced into the three-phase power transformer where the high voltage power is stepped down to a three-phase low voltage power. The three-phase low voltage power has been transmitted to loads through the low voltage bushings. The steel tower effectively bear a tension of the transmission line or bus through the suspension insulator to prevent the tension from being directly applied to the leading-in bushing. In conventional power receiving equipments such as described above, the reinforced concrete foundation for the steel tower has been required to be buried in the earth independently of that for the power transformer. This has resulted in the disadvantages that the construction of the two reinforced concrete foundations increase amounts of earth and sand to increase costs of a foundation work and also days thereof. Accordingly it is Åan object of the present invention to provide a new and improved power receiving equipment simple in foundation work, and still decreased in days of the foundation work resulting in an inexpensive construction. The present invention provides a power receiving equipment comprising a steel tower for supporting one end of a leading-in line drawn out from a selected one of a transmission line and a bus, and a power transformer connected to the other end of the leading-in line through a switchgear, a foundation for the steel tower made integrally with a foundation for a base fixed to the bottom of the power transformer. In a preferred embodiment of the present invention the steel tower is vertically disposed on the foundation for the base between the switchgear and the power transformer. In another preferred embodiment of the present invention the steel tower is vertically disposed on the base through a mounting plate bolted to the base between the switchgear and the power transformer. The present invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawing in which: Figure 1 is a schematic side elevational view of one embodiment according to the power receiving equipment of the present invention; Figure 2 is a schematic plan view of the arrangement shown in Figure 1; Figure 3 is a view similar to Figure 1 but illustrating a modification of the present invention; and Figure 4 is a schematic side elevational view of the footing portion of the steel tower and the adjacent components shown in Figure 3. Referring now to Figures 1 and 2 of the drawing, there is illustrated one embodiment according to the power receiving equipment of the present invention. The arrangement illustrated comprises a three-phase power transformer 10 including three low voltage bushings 12 horizontally drawn out from one side, in this case, the righthand side as viewed in Figures 1 and 2 of the power transformer 10 one for each phase of the system and fixed at the bottom to a base 14 which is, in turn, connected to a reinforced concrete foundation 16 buried in the earth 18 through a plurality of anchor bolts 20 (only two of which are illustrated only for purposes of illustration) buried in the foundation 16. The base 14 is shown in Figure 2 as including four bars arranged in the form of parallel crosses. A circuit breaker 22 is vertically disposed on a supporting block 24 disposed on the foundation 16 to be spaced from the other side of the transformer 10 by a predetermined spacing. Thus the circuit breaker 22 is spaced from the other side of the transformer 10 to form a predetermined spacing thereberween and it is directly connected at one end to the power transformer 10 and at the other end to a circuit disconnector 26 located at substantiai- ly the same level as the top of the circuit breaker 22. Then the circuit disconnector 26 is connected to a ground switch 28 located on that side thereof remote from the circuit breaker 22 and also to a leading-in bushing 30 erected at the top thereof. As shown in Figure 2, the circuit breaker 22, the circuit disconnector 26, and the ground switch 28 are of the three-phase type and form a three-phase switchgear which is disposed in spaced relationship on the other side of the power transformer 10. Also the leading-in bushing is vertically disposed on each of three-phases of the circuit disconnector 26. It has been a common practice to vertically dispose a steel tower on another reinforced concrete foundation buried in the earth to be spaced from that for the power transformer so that the steel tower is spaced from the leading-in bushings as required. This measure has required a pair of separate reinforced concrete foundations resulting in the disadvantages as described above. According to the present invention, however, the foundation for the steel tower is made integral with that for the power transformer. In other words, the steel tower is vertically disposed on the same foundation as the power transformer. In the arrangement shown in Figures 1 and 2, the steel tower 32 is vertically disposed on the foundation 16 16..,-: between the circuit breaker 22 and the the adjacent side of the power transformer 10. That is the steel tower 32 is located adjacent to the power transformer 10. Then a transmission line or a bus 34 is connected to a suspension bushing 36 for each of the three-phase of the system hung from a top portion of the steel tower 32 and also to a leading line 38 connected to the suspension bushing 36 and the associated leading-in bushing 30. As described above, the suspension bushing 36 serves to bear a tension of the transmission line or bus 34 so as to prevent the tension from being directly applied to the associated leading-in bushing 30. In general, the power transformer 10 has the heaviest weight among the components of the power receiving equipment. The higher the capacity of the power transformer and also the higher the voltage thereacross the heavier the weight thereof will be. Actually the weight of the power transformer may amount to from tens to hundredts of tons. Thus the reinforced concrete foundation 16 for rigidly supporting the power transformer 10 with such a heavy weight even against earthquakes has a strength sufficient to fix the steel tower 32 thereto. While the foundation for the steel tower and that for the power transformer have been previously required the present invention can satisfactorily accomplish the desired purposes only by using the single foundation without increasing an area required for the power receiving equipment. In Figures 3 and 4 wherein like reference numerals designate the components identical to those shown in Figures 1 and 2 there is illustrated a modification of the present invention. The arrangement illustrated is different from that shown in Figures 1 and 2 only in that in Figures 3 and: 4 the steel tower 32 is fixed to the reinforced concrete foundation 16 between the circuit breaker 22 and the power transformer 10 by fixing the footing portion of the steel tower 32 to a mounting plate 40 and placing the mounting plate 40 on the edge portion near to the circuit breaker 22 of the base 14 followed by the fixing of the mounting plate 10 to the base 14 through a plurality of bolts 42. In summary, the present invention provides a power receiving equipment comprising a foundation for a steel tower made integral with that for a power transformer. Thus there is provided an inexpensive power receiving equipment simple in foundation work and decreased in days of the foundation work. While the present invention has been illustrated and described in conjunction with a few preferred embodiments thereof it is to be understood that numerous changes and modifications may be resorted to without departing from the spirit and scope of the present invention.

Claims: CLAIMS 1. A power receiving equipment characterized by a steel tower for supporting one end of a leading-in line drawn out from a selected one of a transmission line and a bus, a power transformer connected to the other end of said leading-in line through a switchgear, a foundation for said steel tower made integral with a foundation for a base fixed to the bottom of said power transformer. 2. A power receiving equipment as claimed in claim 1, characterized in that said steel tower is vertically disposed on said foundation for said base between said switchgear and said power transformer. 3. A power receiving equipment as claimed in claim 1, characterized in that said steel tower is fixed to said base through a mounting plate bolted to said base between said switchgear and said power transformer.

Inventors: KUDO, ATSUSHI, SHICHI, MASARU
Applicants: MITSUBISHI DENKI KABUSHIKI KAISHA
Application year: 1984
Main classification: H02B5
IPC codes: E02D27, H02B5