Electrical transmission or interconnection systems – Plural load circuit systems
Patent
1993-06-10
1999-01-19
Wysocki, Jonathan
Electrical transmission or interconnection systems
Plural load circuit systems
307 17, 307 29, 307 41, 307147, H02J 100
Patent
active
058616829
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a distributor for use in a power distribution system at a building, factory, or the like.
BACKGROUND ART
FIG. 11 shows a conventional distribution system at a building. In FIG. 11, 1 denotes a building. 2 denotes receiver switching apparatus installed in an electric room on the basement of the building 1. 3 denotes a circuit breaker. 4 denotes a high-tension bus. 5 denotes circuit breakers. 6 denotes transformers. 7 denotes molded-case circuit breakers associated with loads. 8 denotes cables to be connected to the loads.
The receiver switching apparatus 2 places received power on the high-tension bus via the circuit breakers 3. Branch circuit breakers associated with loads in the building 1 are connected over the high-tension bus 4. Power is fed to the loads via the transformers 6 and molded-case circuit breakers 7. This equipment is usually installed in a main electric room on the basement. In a large-scale building, the equipment is installed in a sub-electric room, which receives power from the main electric room, on each floor. From the electric rooms, cables are laid radially toward loads.
A prior art relating to loop distribution has been disclosed in Japanese Patent Laid-Open No.61-8645, which, however, poses a problem concerning the safety within a cable shaft. Besides, when an attempt is made to modify the rating of a branch transformer, a power cut becomes necessary. Thus, the handling efficiency is poor.
A conventional distributor has the aforesaid configuration that cables are laid radially from an electric room to loads. A lot of cables are therefore required, many man-hours are needed for cable connection, and eventually the construction costs become high. Furthermore, it takes a lot of time to complete the construction.
A conventional loop distribution facility has problems concerning safety and handling efficiency.
The present invention attempts to solve the above problems. An object of the present invention is to provide a distributor that can easily be put into operation with a simple configuration. Another object of the present invention is to provide high-safety distribution equipment for a distributor. Yet another object of the present invention is to provide a distributor permitting uninterrupted power feed with high reliability.
SUMMARY OF THE INVENTION
In a distributor relating to the present invention, a plurality of switches are connected in series with one another on main distribution lines emerging from a receiver switching apparatus, thus forming a trunk. A branch line extends from a junction between each pair of adjoining switches and leads to each of distributed loads via a switch and a transformer.
Switches are combined in twos to form independent branch units. The branch units are connected in series with one another on main distribution lines emerging from a receiver switching apparatus, thus forming a trunk. Power packages in each of which another switch and a transformer are connected in series with each other are connected to the branch units, via which branch lines extend to loads.
For a compact arrangement, the branch units are installed within a cable shaft and concatenated over the main distribution lines.
Each branch unit comprises first and second main distribution line switches, and a housing for shielding the switches.
Each branch unit comprises first and second distribution switches, and a housing for shielding the switches. The switches are located in the lower part of the housing with the junctions facing up. A branch distribution line and main distribution lines are taken in from above the housing.
For a compact power package, a supply bushing and a load bushing are arranged on the top of a transformer, and then shielded with closed housings. A switch is installed in the closed housing for the supply bushing, and a distribution board is placed on the closed housing for the transformer.
In order to realize the supply and load terminals in a power package with independent closed structures, a supply bushi
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Binder et al., "Gesichtspunkte fur den bau moderner Netzstationen," 1971.
Zache, Franz and Binder, Walter, "Gesichtspunkte fur den Bau moderner Netzstationen," Techn.Mitt.AEG-Telefunken, vol. 61, No. 1, pp. 36-47 (1971).
Scheifele, Jurgen et al., "SF.sub.6 -isoliertes Ringkabelfeid als Schaltanlage in Industrienetzen," ETZ Elektrotechnische Zeitschrift, vol. 110, No. 17, pp. 894-898 (Berlin, Sep. 1989).
Kulik, Peter, "Gesichtspunkte fur die Planung von Hoch-und Mittelspannungs-Schaltanlagen," Techn.Mitt.AEG-Telefunken, vol. 59, No. 2, pp. 87-94 (1969).
Hosoya Ryouzou
Nakahata Minoru
Orito Nobuyuki
Sakai Michio
Kaplan Jonathan
Mitsubishi Denki & Kabushiki Kaisha
Wysocki Jonathan
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