Electricity: transmission to vehicles – Conductors – Conduit
Patent
1978-06-22
1980-02-26
Schacher, Richard A.
Electricity: transmission to vehicles
Conductors
Conduit
B60M 134
Patent
active
041901371
ABSTRACT:
In a power transmission system comprising at least two trolley wires for supplying an alternating current power to an electric vehicle, and at least two feeder lines coupled to the trolley wires at feeding points of the corresponding trolley wires spaced apart a given interval for feeding a voltage to the trolley wires, with a closed loop formed between a portion of the trolley wires and a portion of the feeder lines through two adjacent feeding points, a throughtype current transformer is provided for each feeder line such that the feeder line extends through the transformer and the primary winding of the transformer is connected to receive an alternating current voltage between the above described at least two trolley wires, whereby a secondary alternating current induced in the feeder lines serving as a secondary conductor of the transformer flows through the above described closed loop, which causes a Joule heat along the trolley wires, thereby to deicing of the trolley wires. Preferably, an alternating voltage between the above described at least two trolley wires is selectively applied to the primary winding of the transformer, such that a supply of the alternating current voltage to the primary winding is controlled manually or automatically responsive to meteorological conditions. Such an automatic control of a supply to the primary winding of the transformer may be selectively effected, in association with the temperature of the trolley wires being lower than a preset temperature, a predetermined meteorological condition being met by an ambient temperature, water, snow and the like, a current normally flowing through the trolley wires being less than a predetermined value, and the like, singly or in combination.
REFERENCES:
patent: 2870311 (1959-01-01), Greenfield
patent: 3316362 (1967-04-01), Mayo
Nakajima Katsuji
Shimada Akira
Watanabe Kouichi
Dainichi-Nippon Cables Ltd.
Fasse W. G.
Gould D. F.
Kawasaki Jukogyo Kabushiki Kaisha
Schacher Richard A,.
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