Voltage monitor and alarm for power line
Patent
·
OSTI ID:5292765
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
- Country of Publication:
- United States
- Language:
- English
Similar Records
Low voltage supply control system for fuel injectors
Audible low-fuel alarm for propane fuel tank
Control system for internal combustion engines, provided with an exhaust gas recirculation control having a fail safe function
Patent
·
Tue Jun 28 00:00:00 EDT 1988
·
OSTI ID:6776629
Audible low-fuel alarm for propane fuel tank
Patent
·
Tue Aug 18 00:00:00 EDT 1987
·
OSTI ID:6000876
Control system for internal combustion engines, provided with an exhaust gas recirculation control having a fail safe function
Patent
·
Mon Mar 07 23:00:00 EST 1983
·
OSTI ID:6455291
Related Subjects
200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
ALARM SYSTEMS
AUXILIARY SYSTEMS
CURRENTS
DISPLAY DEVICES
ELECTRIC CURRENTS
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY DEPENDENCE
LIGHT BULBS
MEASURING INSTRUMENTS
MONITORING
OSCILLATORS
POWER TRANSMISSION LINES
SIGNALS
VOLTMETERS
24 POWER TRANSMISSION AND DISTRIBUTION
ALARM SYSTEMS
AUXILIARY SYSTEMS
CURRENTS
DISPLAY DEVICES
ELECTRIC CURRENTS
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY DEPENDENCE
LIGHT BULBS
MEASURING INSTRUMENTS
MONITORING
OSCILLATORS
POWER TRANSMISSION LINES
SIGNALS
VOLTMETERS