Abstract: A self-test circuit is provided that includes a signal circuit adapted to periodically output a circuit inhibitor signal to inhibit a breaking signal from a ground fault detector. The signal circuit is also adapted to periodically output a test signal simulating a ground fault. The self-test circuit also includes an alarm circuit adapted to receive an output signal from the ground fault detector in response to detecting the ground fault, and adapted to output an alarm when the ground fault detector is not operative. The signal circuit may be further adapted to periodically output a second test signal simulating a grounded neutral condition. A ground fault circuit interrupter system and a method are also provided.

Abstract: A system and method for converting a pulsed beam of irradiation from a laser operating at a first wavelength to a pulsed beam of irradiation at a second, Stokes, wavelength. The system includes two Raman cells filled with the same Raman-active gas. The second cell receives a backward-propagating Stokes pulse beam from the first Raman cell, with the backward-propagating Stokes pulsed beam entering the second Raman cell in a direction opposite to the direction of travel of the incoming laser pulses at the first wavelength. The second Raman cell generates a high intensity output pulsed beam at the second, Stokes, wavelength. The system can produce a high intensity eye-safe pulsed beam.

Abstract: A self-test circuit is provided that includes a signal circuit adapted to periodically output a circuit inhibitor signal to inhibit a breaking signal from a ground fault detector. The signal circuit is also adapted to periodically output a test signal simulating a ground fault. The self-test circuit also includes an alarm circuit adapted to receive an output signal from the ground fault detector in response to detecting the ground fault, and adapted to output an alarm when the ground fault detector is not operative. The signal circuit may be further adapted to periodically output a second test signal simulating a grounded neutral condition. A ground fault circuit interrupter system and a method are also provided.

Abstract: Certain exemplary embodiments comprise an electrical power distribution panel, which can comprise a Source Line Evaluation Detector. The Source Line Evaluation Detector can be configured to open a contactor responsive to at least one condition from a plurality of monitored electrical source line conditions. The Source Line Evaluation Detector can be configured to monitor the one or more monitored electrical source line conditions.

Abstract: Certain exemplary embodiments comprise an electrical power distribution panel, which can comprise a Source Line Evaluation Detector. The Source Line Evaluation Detector can be configured to open a contactor responsive to at least one condition from a plurality of monitored electrical source line conditions. The Source Line Evaluation Detector can be configured to monitor the one or more monitored electrical source line conditions.

Abstract: A method and apparatus for an undervoltage relay control apparatus monitoring voltage of the circuit breaker. The undervoltage relay controller apparatus comprises a housing with a latch assembly mounted in the housing. The latch assembly includes a latch mechanism and a solenoid, with the solenoid in selective contact with the latch mechanism. An electrical circuit, having a voltage input and a voltage output is mounted in the housing and coupled to the latch assembly. Wherein a control voltage input to the electrical circuit is conditioned, independently of parameters of the solenoid, and wherein if the received control voltage input is less than a predefined voltage, the electrical circuit will remove power to the solenoid allowing the solenoid to contact the latch mechanism and trip the circuit breaker.

Abstract: A controller (10) controls the application of charge pulses and discharge (depolarization) pulses to a battery (26) via a charge pulse circuit (22) and a discharge pulse circuit (24). A feedback circuit (18) allows the controller to monitor and adjust the charging process. A wave shaper (12) shapes the waveform of the charge pulses so as to limit the rise time of the charge pulses and thereby reduce reflected voltages and currents. A limiter (14) disables the charging circuit in the event that the controller should specify a charge pulse having an excessive duration or a continuous duration. Another limiter (16) limits the duration of the discharge pulses in the event that the controller should specify a discharge pulse having an excessive duration or a continuous duration. The charge pulse circuit is disabled whenever the controller specifies the application of a discharge pulse, and the discharge circuit is disabled whenever the controller specifies the application of a charge pulse.

Abstract: A light detector measures the intensity of two different light beams, computes a ratio of an AC to a DC component for each light beam, and computes a quotient by dividing a first of the above ratios by a second of the above ratios. A light detector has a first photodetector, means, responsive to the first photodetector, for computing a first ratio of an AC component to a DC component of the intensity of a first light detected by the first photodetector, means for producing a first average value of the first ratio, a second photodetector, means, responsive to the second photodetector, for computing a second ratio of an AC component to a DC component of the intensity of the second light detected by the second photodetector, means for producing a second average value of the second ratio, and means for computing a quotient by dividing the first average value of the first ratio by the second average value of the second ratio.

Abstract: A circuit for controlling a display panel identifying malfunctions in an engine generator receives a plurality of electrical signals from the engine generator, each of which identifies a particular trouble. The electrical signal may be produced by closing a switch. It is caused to operate a latch that lights a light associated with the particular malfunction. Indications of other malfunctions are suppressed until the circuit is reset. A manual reset tests all lights and then leaves them off ready to respond. A power-up reset does not test lights but leaves all lights off ready to respond. The circuit is rendered especially appropriate for military use by hardening against radiation and against pulses of electromagnetic interference.

Abstract: A circuit for providing an indication of watt-hours from a voltage input that is an analog of watts comprises a source of a high-frequency square wave and a precision triangular wave at a frequency that is derived from the high-frequency square wave by frequency division. A time interval is derived by selecting a period between a time when the triangular wave crosses zero volts and the time at which the amplitude of the triangular wave equals the analog input voltage. A count of the number of cycles of the high-frequency signal during that interval provides a measure of the value of the input voltage, and a continuing count of that number of cycles provides a time-integrated value of the count. When the input signal is analogous to watts, the integrated output provides a measure of watt-hours.

Abstract: A ground-fault circuit interrupter is provided with an additional current-sensing element that responds to a net value of current through the power wires in an ac circuit. The winding may be wound on a ferromagnetic core of its own or it may be placed as a separate winding on a core that is used to sense imbalance in a GFCI. In the latter case the extra winding must be insulated electrically from the main sense winding. The additional coil is connected to a rectifying diode and a capacitor, so that an imbalance of current in the power wires charges the capacitor. The voltage thus developed across the capacitor is used to operate the tripping mechanism of the ground-fault circuit interrupter. The fault-powered signal thus attained in the added winding will enable the GFCI to operate despite the existence of heavy fault currents that reduce the operating voltage to the rest of the GFCI to a level that would otherwise prevent its operation.