Apparatus for deicing of trolley wires
First Claim
1. An apparatus for deicing of trolley wire in a power transmission system comprising:
- at least two trolley wires for supplying an alternating current power to an electric vehicle, each of which has a feeder line, said feeder line being connected to said trolley wires at a plurality of points to form a plurality of closed loops, and each feeder line in said closed loops passing through the through aperture of a through-type current transformer having a primary winding to which a voltage between said two trolley wires is applied in order to cause a Joule heat along said trolley wires.
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Accused Products
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.
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Citations
10 Claims
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1. An apparatus for deicing of trolley wire in a power transmission system comprising:
at least two trolley wires for supplying an alternating current power to an electric vehicle, each of which has a feeder line, said feeder line being connected to said trolley wires at a plurality of points to form a plurality of closed loops, and each feeder line in said closed loops passing through the through aperture of a through-type current transformer having a primary winding to which a voltage between said two trolley wires is applied in order to cause a Joule heat along said trolley wires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for deicing of trolley wires in accordance with any of the proceeding claims, wherein said power transmission system comprises three said trolley wires and three said feeder lines for supplying a three-phase alternating current power to an electric vehicle, and through-type current transformers are each provided for each feeder line such that each said feeder line extends through said through opening of said core of each said through-type current transformer.
Specification