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Title: Power line detection system

Abstract

A short-range, radio frequency (RF) transmitting-receiving system that provides both visual and audio warnings to the pilot of a helicopter or light aircraft of an up-coming power transmission line complex. Small, milliwatt-level narrowband transmitters, powered by the transmission line itself, are installed on top of selected transmission line support towers or within existing warning balls, and provide a continuous RF signal to approaching aircraft. The on-board receiver can be either a separate unit or a portion of the existing avionics, and can also share an existing antenna with another airborne system. Upon receipt of a warning signal, the receiver will trigger a visual and an audio alarm to alert the pilot to the potential power line hazard. 4 figs.

Inventors:
;
Publication Date:
OSTI Identifier:
6992520
Patent Number(s):
US 5351032; A
Application Number:
PPN: US 8-019696
Assignee:
Univ. of California, Oakland, CA (United States) PTO; EDB-94-151425
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Patent File Date: 19 Feb 1993
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; AIRCRAFT; ALARM SYSTEMS; HELICOPTERS; POWER SYSTEMS; SAFETY ENGINEERING; ENERGY SYSTEMS; ENGINEERING; 240400* - Power Transmission & Distribution- Health & Safety- (1990-)

Citation Formats

Latorre, V.R., and Watwood, D.B.. Power line detection system. United States: N. p., 1994. Web.
Latorre, V.R., & Watwood, D.B.. Power line detection system. United States.
Latorre, V.R., and Watwood, D.B.. Tue . "Power line detection system". United States. doi:.
@article{osti_6992520,
title = {Power line detection system},
author = {Latorre, V.R. and Watwood, D.B.},
abstractNote = {A short-range, radio frequency (RF) transmitting-receiving system that provides both visual and audio warnings to the pilot of a helicopter or light aircraft of an up-coming power transmission line complex. Small, milliwatt-level narrowband transmitters, powered by the transmission line itself, are installed on top of selected transmission line support towers or within existing warning balls, and provide a continuous RF signal to approaching aircraft. The on-board receiver can be either a separate unit or a portion of the existing avionics, and can also share an existing antenna with another airborne system. Upon receipt of a warning signal, the receiver will trigger a visual and an audio alarm to alert the pilot to the potential power line hazard. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 27 00:00:00 EDT 1994},
month = {Tue Sep 27 00:00:00 EDT 1994}
}
  • A short-range, radio frequency (RF) transmitting-receiving system that provides both visual and audio warnings to the pilot of a helicopter or light aircraft of an up-coming power transmission line complex. Small, milliwatt-level narrowband transmitters, powered by the transmission line itself, are installed on top of selected transmission line support towers or within existing warning balls, and provide a continuous RF signal to approaching aircraft. The on-board receiver can be either a separate unit or a portion of the existing avionics, and can also share an existing antenna with another airborne system. Upon receipt of a warning signal, the receiver willmore » trigger a visual and an audio alarm to alert the pilot to the potential power line hazard.« less
  • A method is described for measuring current in a transmission line which consists of: establishing a reference transmission line exposed to similar ambient conditions as the transmission line in which current is to be measured; passing a measured current through the reference transmission line raising its temperature above ambient; and using at least one infrared detecting device to measure the temperatures of the reference transmission line and the transmission line in which current is to be measured; computing, from the measured current and from the respective measurements of the temperatures of the reference transmission line and the transmission line inmore » which current is to be measured, the current sought to be measured.« less
  • A nuclear radiation and pressure sensitive line/perimeter detection system is described which consists of: a radiation sensitive circuit comprising: at least one nuclear-radiation sensitive fiber for producing scintillating photons in the presence of nuclear radiation; the fiber comprising an organic scintillator embedded in a polymer forming an elongated cable; at least one light-transmitting optical fiber optically connected to the radiation sensitive fiber for propagation of the photons; detector means connected to the optical fiber and comprising a photo-multiplier means for receiving the photons; electronic means operatively associated with the radiation sensitive fiber for receiving signals generated thereby; a pressure sensitivemore » circuit comprising: a pressure sensitive fiber, in the form of an elongated cable, operatively associated with the radiation sensitive fiber for detecting pressure; the electronic means being operatively associated with the pressure sensitive fiber for receiving signals generated thereby; a read-out device electrically connected to the electronic means, and electronic means including logic means comprising an AND gate for transmitting a signal from the radiation sensitive circuit to the read-out device only if a signal from and pressure sensitive circuit is present at the AND gate.« less
  • A system employing a plurality of electronic oscillators for generating test signals at spaced locations remote from a selection point is claimed. The oscillators are coupled to a gathering line for petroleum products, each being located adjacent to an acoustic detector coupled to the line for signaling the presence of a leak within its range. A digital selector which manually generates a given number of pulses is located at the selection point. There is a binary counter at each oscillator to receive the pulses. And, there is also a binary encoder at each oscillator to determine which one will bemore » energized, depending upon the number of pulses generated by the selector. 6 claims, 2 figures.« less
  • A system and method for complete on-line testing of the emergency trip system of a turbine power plant is disclosed. The mechanical trip valve and a portion of a line to drain, of the emergency trip system, are isolated from the remaining portions. The testing of the valve is permitted without an opening to drain the line, which would cause a turbine trip. A three-way solenoid valve obstructs the line to isolate an upstream portion from a downstream portion while permitting introduction of fluid into the downstream portion at a pressure distinct from that in the isolated upstream portion. Pressuremore » sensitive switches, which operate suitable indications are provided in fluid communication with both portions of the line to drain to sense the differential pressure therebetween upon operation of the solenoid valve and, subsequently, a rapid diminishing of pressure in the downstream portion indicative of a successful test of the mechanical trip valve.« less