Apparatus for deicing of trolley wires
US4190137A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 22, 1978 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Jun 22, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60M3/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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 vo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.