Abstract: A parallel array of a plurality of controlled rectifier bridges for converting multi-phase AC current to DC. Each bridge includes a plurality of rectifier segments. One segment for each polarity of each phase of current. A sensor monitors the current and temperature at each rectifier. The sensor outputs for corresponding segments among the bridges are compared and the timing of the conduction of the rectifiers are controlled to maintain the current and temperatures among the corresponding segments in balance.

Abstract: A three-phase controlled rectifier bridge for converting alternating current to direct current includes six segments for each of the positive and negative polarities of each of three AC phases. Each of the segments has a semiconductor controlled rectifier element responsive to a control signal to control current conduction within the segment. A conduction monitor, which is provided for each of the AC phases, monitors a corresponding one of the AC phases to provide a conduction monitor signal. A first shunt current sensor senses current of the segments for the positive polarity of the AC phases and provides a first current signal. A second shunt current sensor senses current of the segments for the negative polarity of the AC phases and provides a second current signal.

Abstract: A method and apparatus for enabling the continuous monitoring of the operational state of circuit components includes a scheme for generating a plurality of voltage signals representing neutral-to-line voltages of the system and adding to each of those signals a second signal, each second signal being identical. This addition is done vectorially to yield a modified signal. A representation of the modified signal as acted upon by the circuit to be monitored is compared with a representation of the neutral-to-line voltage signal to yield an output signal representative of the operational state of the circuit components.

Abstract: In a system for stabilizing the operation of an electrical generator connected to a power distribution network, which system includes a power system stabilizer operating through a modulator circuit to control generator oscillations, there is included a scheme for testing the integrity of the power system stabilizer and modulator circuit which involves the application of a test signal having known values to the power system stabilizer. This test signal propagates through the circuitry and the resultant output is demodulated to be compared with a stored representation of the test signal to thus yield outputs representing the gain and phase shift of the power system stabilizer and modulator circuit in combination.

Abstract: A method and apparatus for enabling the continuous monitoring of the operational state of circuit components includes a scheme for generating a plurality of voltage signals representing neutral-to-line voltages of the system and adding to each of those signals a second signal, each second signal being identical. This addition is done vectorially to yield a modified signal. A representation of the modified signal as acted upon by the circuit to be monitored is compared with a representation of the neutral-to-line voltage signal to yield an output signal representative of the operational state of the circuit components.

Abstract: A brushless generator exciter employs a hybrid full-wave rectifier in which at least some of the rectifying diodes are controllable according to an external signal for adjusting the total exciter power fed to the generator rotor. An optical transmission technique is employed for communicating gate and sync signals between stationary and rotating components.

Abstract: The specification relates to a stabilized composition of epihalohydrin homopolymers or copolymers of epihalohydrin with an alkylene oxide and a nickel salt of a branched-chain dialkyldithiocarbamate. The specification also relates to a process for stabilizing epihalohydrin homopolymers and copolymers against adverse effects of aging by compounding the polymers with a nickel salt of a branched-chain dialkyldithiocarbamate.