Patent
DC Ground fault detector wherein fault is sensed by noting imbalance of magnetic flux in a magnetic core
Gerald L. Wilson,David M. Otten +1 more
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TLDR
A dc ground fault detector in which ground fault is sensed by noting an imbalance of magnetic flux due to a pair of windings on a toroidal core is described in this article.Abstract:
A dc ground fault detector in which ground fault is sensed by noting an imbalance of magnetic flux due to a pair of windings on a toroidal core.read more
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Systems and methods for generator ground fault protection
TL;DR: In this article, a generator winding-to-ground fault detection system is presented that includes a signal injection source in electrical communication with a winding of an electric power generator via an injection transformer.
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TL;DR: In this paper, a method of and apparatus for the detection of insulation deterioration in an electrical power supply system utilizes the detection a progressive wave generated by a corona discharge or partial discharge due to such insulation deterioration.
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Methods and apparatus for continuous ground fault self-test
TL;DR: In this paper, an example ground fault detection device includes a sense coil to detect current imbalance in a line conductor and a neutral conductor, the sense coil comprising a winding influenced by a current difference between the line and the neutral conductor.
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Ground fault detection system and method
TL;DR: A ground fault detection system is provided in this paper, which includes a magnetic core having first and second primary legs and a secondary leg disposed between the first and secondary legs between them.
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System and method for ground fault detection
TL;DR: In this paper, the authors proposed a method to detect and identify ground faults in a power conversion system using AC coupling to sense a system voltage to determine a leakage flux linkage, and to identify a faulted converter phase based on a phase shift angle of the leakage flux.
References
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Cross-field ground fault sensor
TL;DR: In this article, a differential transformer has a core of low permeability ferromagnetic material, a pair of identical primary windings and a secondary winding of relatively few turns capable of producing a large voltage output for a small magnitude ground fault current.
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Means for measuring magnitude and direction of a direct current or permanent magnet, including clip-on direct current sensing inductor
TL;DR: In this paper, the duty factor modulation and direct current output are linear functions of the input and restore the average magnetic intensity of a sense inductor core of non-linear magnetic material.
Patent
Apparatus for sensing current transformer primary current as a function of differential core inductance
TL;DR: In this article, the secondary winding of a current transformer is driven by a high frequency AC source to excite the core to alternating, uniformly equal positive and negative peaks of current excitation.
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Differential microampere current sensor
TL;DR: In this paper, an ultrarasensitive current sensor detects unbalanced current in two or more AC load conductors passing through a search sensor coil, the signal from which is amplified.
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Method and apparatus for detecting direct currents in a transmission line
TL;DR: In this paper, a pair of separate magnetic cores are used, each having associated drive windings connected in series with the transmission line conductors, and associated sense windings, so as to cause detection of the direct loop current flowing in the transmission lines, and at the same time to cause self-cancellation of any electromagnetic coupled of the sensing signal to the drive winds.