Search International and National Patent Collections

1. (WO2017181268) METHODS AND APPARATUS FOR DETECTING FAULTS USING A NEGATIVE-SEQUENCE DIRECTIONAL RELAY

Pub. No.:    WO/2017/181268    International Application No.:    PCT/CA2017/000097
Publication Date: Fri Oct 27 01:59:59 CEST 2017 International Filing Date: Sat Apr 22 01:59:59 CEST 2017
IPC: H02J 13/00
H02H 3/34
H02J 3/26
Applicants: HOOSHYAR, Ali
IRAVANI, Mohammed Reza
Inventors: HOOSHYAR, Ali
IRAVANI, Mohammed Reza
Title: METHODS AND APPARATUS FOR DETECTING FAULTS USING A NEGATIVE-SEQUENCE DIRECTIONAL RELAY
Abstract:
A fault detection / control system and related software for a relay in a power grid are provided. The system comprises: a first module to receive and store voltage and current data relating to a directional element in a power circuit in the power grid; a second module to calculate a negative-sequence impedance associated with the element using the voltage and current data; and a third module to determine whether an asymmetric fault is present at the element, based on an evaluation of the negative-sequence impedance. The control system and software may alternatively or additionally comprise: a module to calculate a superimposed positive-sequence impedance for the directional element using the voltage and current data; and a module to determine whether a symmetric fault is present at the directional element, based on an evaluation of a magnitude of the superimposed positive-sequence impedance.