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1. US20180233895 - LOCALIZED APPLICATION OF HIGH IMPEDANCE FAULT ISOLATION IN MULTI-TAP ELECTRICAL POWER DISTRIBUTION SYSTEM

Office
United States of America
Application Number 15435002
Application Date 16.02.2017
Publication Number 20180233895
Publication Date 16.08.2018
Publication Kind A1
IPC
H02H 3/08
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
08responsive to excess current
G01R 31/02
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
02Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
CPC
G01R 31/025
H02H 3/083
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection
08responsive to excess current
083for three-phase systems
Applicants Electrical Materials Company
Inventors Timothy M. O'Regan
Timothy J. O'Regan
Thomas M. Hayes
Title
(EN) LOCALIZED APPLICATION OF HIGH IMPEDANCE FAULT ISOLATION IN MULTI-TAP ELECTRICAL POWER DISTRIBUTION SYSTEM
Abstract
(EN)

A high impedance fault isolation system (HIFIS) identifies, isolates and dissipates high impedance, low current faults which occur within an individual tap, or branch, of an electric power distribution system using only portions of the tap affected. A master meter, or father smart meter (FSM), on the affected tap sends a coded signal to an antenna receiver combined with a microprocessor and chip which operates an electromagnetic control (EMC) grounding spring switch which isolates the downed primary conductor by causing the distribution system protecting device, i.e., a high voltage fuse or recloser, to de-energize the downed primary wire. This localized application of the HIFIS at the individual tap level allows the FSM to analyze and determine, for example, that the specific field condition is a “downstream wire down”, and that the installed isolating device has failed to operate because of insufficient fault current, allowing the localized intervention of the HIFIS to achieve the de-energization more efficiently and safely, and within a much shorter time period. A fire door sensor circuit then receives the trip signal from the microprocessor, causing the fire door sensor to melt open and release a shorting spring, in initiating operation of an expulsion fuse or recloser, which kills the downed live wire.


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