US 10,852,359 B2 · Apparatus and method for DC-component-based fault classification of three-phase distribution power cables with magnetic sensing

Abstract

A DC-component-based fault classification apparatus and method for a three-phase power distribution cable utilizes the reconstructed three-phase currents by measuring the magnetic field around the cable with an array of magnetic sensors arranged around the cable surface. A magnetic shield houses the magnetic sensors and blocks background magnetic fields. A data acquisition system acquires analog signals from the sensors and a processing system extracts DC components in the analog signals for the phases during the transient period after a fault. The potential DC components are extracted by mathematical morphology. These DC components arise in the faulted phases when a fault occurs since there is a large current change in the inductive power network.

Claims10

Dependent claims

An apparatus for short-circuit fault classification of a three-phase power distribution cable, comprising:

at least three magnetic sensors, wherein the magnetic sensors are arranged in a circular way to form an array about the cable;
a magnetic shield to house the magnetic sensors and to block external magnetic fields;
a data acquisition system for acquiring analog signals from the magnetic sensors;
and
a processing and display system to extract DC components in the analog signals for phases during a transient period after a short-circuit fault and to display those DC components as an indication of the short-circuit fault classification.

2 more elements

Dependencies are inferred from the claim text.

Apparatus and method for DC-component-based fault classification of three-phase distribution power cables with magnetic sensing

Life of this patent

Apparatus and method for DC-component-based fault classification of three-phase distribution power cables with magnetic sensing

Life of this patent

Abstract

Claims10