Patent
Electric switching surge protection
TLDR
An electric switching surge protector comprising a nonlinear, voltage and frequency sensitive RC network connectable between earth and a phase of a switch controlled, AC electric load circuit is proposed in this article, where the capacitance component is operative to decouple the resistance components from the circuit at power supply frequency but to couple the combined resistive impedance of the parallel connected linear and nonlinear resistance components effectively into the circuit under high frequency conditions.Abstract:
An electric switching surge protector comprising a non-linear, voltage and frequency sensitive RC network connectable between earth and a phase of a switch controlled, AC electric load circuit. The RE network includes a linear resistance component; a non-linear resistance component connected in parallel with the linear resistance component and having a pre-determined knee-point voltage value; and a capacitance component connected in series with the parallel connected linear and non-linear resistance components. The capacitance component is operative to decouple the resistance components from the circuit at power supply frequency but to couple the combined resistive impedance of the parallel connected linear and non-linear resistance components effectively into the circuit under high frequency conditions. The capacitance component is further operative to increase the rise time of that portion of a steep fronted surge which exceeds the knee-point voltage value of the non-linear resistance component.read more
Citations
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Overvoltage protection device
TL;DR: In this paper, a chalcogenide glass threshold switching element was arranged or arranged to be connected between a current carrying line and earth, and a capacitor connected in a series with the switching element.
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References
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Patent
Transient voltage suppression system
TL;DR: An improved transient voltage suppression system for use in an electrical power distribution system which includes at least one power line and a neutral or ground line was proposed in this article. But the system was not suitable for the use of a large number of power lines.
Patent
Active filter circuit for transient suppression
TL;DR: In this paper, the magnitude of the pulse is limited to the threshold value of a selected breakdown device that is equally effective with voltage excursions of either polarity, and which includes means to reduce the high frequency content of the noise pulse and radically attenuate any tendency for oscillation.
Patent
Surge protection for electrical apparatus
TL;DR: In this paper, the present invention relates to the protection of electrical apparatus against voltage surges or dangerous oscillatory voltages and, more particularly, to protection of apparatus, such as dynamo-electric machines, connected to a high voltage transmission line through transformers.
Patent
Line overvoltage protection for electrical device - has symmetrical variable resistors coupled to isolating transformer secondary
TL;DR: In this article, the overvoltage protection for an electrical device with an input isolating transformer using symmetrical variable resistances (SV resistances) in parallel with the transformer secondary winding and between one of the secondary conductors and an earth contact is described.