Communications – electrical: acoustic wave systems and devices – Selective – Frequency responsive actuation
Patent
1982-02-22
1984-05-29
Yusko, Donald J.
Communications, electrical: acoustic wave systems and devices
Selective
Frequency responsive actuation
340644, 361115, G08B 2100
Patent
active
044519109
ABSTRACT:
A signalling system to indicate the position of a disconnect switch used in an electric transmission line. The switch has at least one moving contact and at least one fixed contact. The system comprises two transmitters associated with the moving and fixed contacts to transmit at least one ultrasonic signal indicating the position of the moving contact with relation to the fixed contact of the disconnect switch. A receiver assembly receives the ultrasonic signal transmitted by the transmitters and generates an output signal representative of the position of the moving and fixed contacts.
REFERENCES:
patent: 3550090 (1970-12-01), Baker, Jr. et al.
patent: 4236149 (1980-11-01), Soyck
patent: 4358810 (1982-11-01), Wafer et al.
Hydro-Quebec
Yusko Donald J.
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