Voltage monitoring system

Claim 1

A system for monitoring the voltage at a remote location for determining when said voltage exceeds an upper level or drops below a lower level comprising: A. voltage reducing means coupled to said voltage to be monitored for reducing said voltage to a predetermined level, B. a voltage analyzer located at a station remote from said voltages being monitored, C. transmission lines coupled to said voltage reducing means for transmitting said reduced voltage to said voltage analyzer, D. said voltage analyzer including: E. an amplifier means for amplifying said reduced voltage producing an amplified voltage, F. a full wave rectifier coupled to said amplifier means for rectifying said amplified voltage producing a rectified signal, G. an over-voltage sensing unijunction transistor coupled to said full wave rectifier for being activated when said voltage rises above an upper predetermined voltage level, to produce an over-voltage signal, H. adjustable resistor means interposed between said overvoltage sensing unijunction transistor and said full wave rectifier for controlling the upper voltage level that said over-voltage sensing unijunction transistor is activated, I. an under-voltage sensing unijunction transistor coupled to said full wave rectifier for being activated when said voltage drops below a predetermined lower level to produce an undervoltage signal, J. adjustable resistor means interposed between said undervoltage sensing unijunction transistor and said full wave rectifier for controlling the lower voltage level that said under-voltage sensing unijunction transistor is activated, and K. recorder means coupled to an output of said amplifier means whereby said recorder records said amplified voltage so that it can be subsequently analyzed, L. means coupled to the outputs of said over-voltage and undervoltage unijunction transistors for activating said recorder means responsive to receiving an over-voltage or under-voltage signal.

Claim 2

A system for monitoring the voltage at a remote location for determining when said voltage exceeds an upper level or drops below a lower level comprising: A. voltage reducing means coupled to said voltage to be monitored for reducing said voltage to a predetermined level, B. a voltage analyzer located at a station remote from said voltages being monitored, C. transmission lines coupled to said voltage reducing means for transmitting said reduced voltage to said voltage analyzer, D. said voltage analyzer including: E. an amplifier means for amplifying said reduced voltage producing an amplified voltage, F. a full wave rectifier coupled to said amplifier means for rectifying said amplified voltage producing a rectified signal, G. an over-voltage sensing unijunction transistor coupled to said full wave rectifier for being activated when said voltage rises above an upper predetermined voltage level, to produce an over-voltage signal, H. adjustable resistor means interposed between said overvoltage sensing unijunction transistor and said full wave rectifier for controlling the upper voltage level that said over-voltage sensing unijunction transistor is activated, I. an under-voltage sensing unijunction transistor coupled to said full wave rectifier for being activated when said voltage drops below a predetermined lower level to produce an undervoltage signal, J. adjustable resistor means interposed between said undervoltage sensing unijunction transistor and said full wave rectifier for controlling the lower voltage level that said under-voltage sensing unijunction transistor is activated, and K. recorder means coupled to an output of said amplifier means whereby said recorder records said amplified voltage so that it can be subsequently analyzed, L. means coupled to the outputs of said over-voltage and undervoltage unijunction transistors for activating said recorder means responsive to receiving an over-voltage or under-voltage signal.

Claim 7

A system for monitoring the voltage at a remote location for determining when said voltagE exceeds an upper level or drops below a lower level comprising: A. voltage reducing means coupled to said voltage to be monitored for reducing said voltage to a predetermined level, B. a trigger circuit located at a station remote from said voltage being monitored. C. transmission lines coupled to said voltage reducing means for transmitting said reduced voltage to said trigger circuit, D. said trigger circuit including: E. an amplifier means having an input coupled to said transmission lines and a pair of outputs, said amplifier means amplifying said reduced voltage producing amplified voltages on said outputs, F. an oscillograph coupled to one of said outputs of said amplifier means, G. an over and under-voltage pulse producing means coupled to said other output of said amplifier means for producing pulses responsive to said voltage exceeding said upper and lower levels, H. said over and under-voltage pulse producing means including a pair of unijunction transistors which produce said pulses responsive to said voltage exceeding said upper and lower levels, I. a source of power, and J. relay means coupled to said pulse producing means and said oscillograph for connecting said source of power to said oscillograph to turn said oscillograph on responsive to receiving a pulse from said over or under-voltage pulse producing means, K. whereby said oscillograph records said voltages exceeding said upper and lower levels.

Claim 8

A system for monitoring the voltage at a remote location for determining when said voltagE exceeds an upper level or drops below a lower level comprising: A. voltage reducing means coupled to said voltage to be monitored for reducing said voltage to a predetermined level, B. a trigger circuit located at a station remote from said voltage being monitored. C. transmission lines coupled to said voltage reducing means for transmitting said reduced voltage to said trigger circuit, D. said trigger circuit including: E. an amplifier means having an input coupled to said transmission lines and a pair of outputs, said amplifier means amplifying said reduced voltage producing amplified voltages on said outputs, F. an oscillograph coupled to one of said outputs of said amplifier means, G. an over and under-voltage pulse producing means coupled to said other output of said amplifier means for producing pulses responsive to said voltage exceeding said upper and lower levels, H. said over and under-voltage pulse producing means including a pair of unijunction transistors which produce said pulses responsive to said voltage exceeding said upper and lower levels, I. a source of power, and J. relay means coupled to said pulse producing means and said oscillograph for connecting said source of power to said oscillograph to turn said oscillograph on responsive to receiving a pulse from said over or under-voltage pulse producing means, K. whereby said oscillograph records said voltages exceeding said upper and lower levels.