Continuous uninterruptable AC grounding system for power system protection
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A grounding system, electrical connection technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, components of emergency protection devices, etc., can solve problems such as readjustment of power systems
Active Publication Date: 2013-07-24
EMPRIMUS
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In addition, during the installation of these types of solutions, it may be necessary to readjust the relay settings of the power system
Thus, there is no solution that provides a reliable low-cost protection circuit that is compatible with current power delivery systems
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[0032]In general, the present disclosure describes systems and methods for protecting power transformers and other electronic or electromechanical equipment from damage from DC current and resulting harmonic content on power lines. Large DC midpoint currents and harmonic voltages can be geomagnetic (solar) storms, high amplitude electromagnetic E3 pulses (HEMP-E3) or other electrical equipment on the same grid or local power circuit such as switching power supplies, arc welding equipment, plasma Results of cutting, EDM equipment, arc lamps, etc. This disclosure generally describes methods and systems for sensing the harmonic content of 50Hz or 60Hz power line power supplies, and potentially disrupting midpoint DC currents, to allow critical electrical The device switches to operational protection mode.
[0033] According to various embodiments described herein, protection of high voltage power systems from GIC (solar storm) and EMP E3 pulses is achieved using a continuous uni...
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Abstract
A continuous grounding system for use in an alternating current system including a transformer is disclosed. The system includes a switch assembly connected between a transformer neutral of a transformer and a ground, the switch assembly having an open position and a closed position, the open position disrupting the path through the switch assembly between the electrical connection and the transformer neutral, and the closed position establishing a path connecting the electrical connection to the transformer neutral through the switch assembly, wherein in normal operation of the alternating current electrical device the switch assembly remains in a closed position. The system also includes a DC blocking component positioned in parallel with the switch assembly and connected between the transformer neutral and the ground. The system further includes a control circuit configured to control the switch assembly, the control circuit including a sensor configured to actuate the switch assembly to an open position upon detection of a predetermined harmonic signal threshold at one of the transformer phases or a predetermined threshold of DC current between the transformer neutral and ground.
Description
[0001] This application was filed on July 19, 2011 as a PCT International Patent Application, for all countries except the United States the designated applicants are the US domestic company Emprimus, for the US only the designated applicants are Frederick R. Faxvog, Wallace Jensen, Gale Nordling, Greg Fuchs, David Blake Jackson, Terry Lee Volkmann, James Nicholas Ruehl, and Brian Groh, all U.S. citizens. [0002] Cross References to Related Applications [0003] This application claims U.S. Provisional Application No. 61 / 366,088 filed on July 20, 2010, U.S. Provisional Application No. 61 / 408,319 filed on October 29, 2010, and U.S. Provisional Application No. 61 / 408,319 filed on January 6, 2011 61 / 430,388, U.S. Provisional Application No. 61 / 437,498 filed January 28, 2011, U.S. Provisional Patent Application No. 61 / 486,635 filed May 16, 2011, and U.S. Application for Invention filed June 13, 2011 Interest in No. 13 / 159,374. The entire contents of these applications are hereby ...
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