Voltage monitor and alarm for power line

Patent · Tue Sep 02 00:00:00 EDT 1986

OSTI ID:5292765

Fathi, S S

A device is described for monitoring the voltage of an electrical power line means, comprising: lamps in circuit with the power line means; a display driver in circuit with the lamps and the power line means and arranged to light one lamp at a time depending on the voltage of the power line means in a predetermined voltage range; oscillator means in circuit with the display driver for generating a fixed frequency signal when the voltage of the power line means is outside the voltage range; an audible sound generator in circuit with the oscillator means and driven thereby to sound an alarm when the oscillator means generates the signal; an auxiliary power supply connected in circuit with the oscillator means; and electronic latching means in circuit with the auxiliary power supply and the oscillator means and arranged to pass a driving current to the oscillator means to keep the same energized and generating the signal, so that the alarm continues to sound even though the voltage of the power line means returns to a magnitude within the predetermined voltage range.

• Assignee: Ultima Electronics, Ltd., Farmingdale, NY
• Patent Number(s): US 4609914
• OSTI ID: 5292765
• Resource Relation: Patent File Date: Filed date 19 Apr 1984
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
POWER TRANSMISSION LINES
ALARM SYSTEMS
VOLTMETERS
AUXILIARY SYSTEMS
DISPLAY DEVICES
ELECTRIC CURRENTS
ELECTRONIC CIRCUITS
FREQUENCY DEPENDENCE
LIGHT BULBS
MONITORING
OSCILLATORS
SIGNALS
CURRENTS
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
MEASURING INSTRUMENTS
200300* - Electric Power Engineering- Power Transmission & Distribution- (-1989)