US 10,416,221 B2 · Voltage based method for fault identification in a transmission line apparatus thereof

Abstract

The present invention provides a method for current for fault identification in a transmission line and an apparatus thereof. The method comprises the following steps: measuring the real-time values of the currents and the voltages of the other unbroken healthy phase conductors when a single-phase fault occurs; calculating the inductive voltage and the capacitive coupling voltage according to the measured currents and voltages respectively; comparing the capacitive coupling voltage with the inductive voltage multiplied by a factor, in which the multiplication result is used as a self-adjusted threshold based on the real time load condition of the transmission line; and identifying the fault type based on the maximum of the capacitive coupling voltage and the multiplication.

Claims16

Dependent claims

A method for reclosing a circuit breaker coupled to a power transmission line, comprising:

opening the circuit breaker when a single-phase fault occurs;
measuring real-time values of currents and voltages of unbroken, healthy phase conductors when the single-phase fault occurs;
calculating an inductive voltage and a capacitive coupling voltage according to the measured currents and the measured voltages respectively;
comparing the capacitive coupling voltage with a multiplication result being the inductive voltage multiplied by a factor, in which the multiplication result is a self-adjusted threshold based on a real-time load condition of the transmission line;
determining a larger value between the capacitive coupling voltage and the multiplication result based on the comparison;
identifying a fault type based on the larger value between the capacitive coupling voltage and the multiplication result;
and
closing the circuit breaker in response to identifying the fault type as a transient fault.

5 more elements

A transmission line fault identification system comprising:

a circuit breaker coupled to a transmission line;
wherein the transmission line fault identification system is structured to:
open the circuit breaker after a single-phase fault occurs;
measure real-time values of currents and voltages of unbroken, healthy phase conductors when a single-phase fault occurs and measure a terminal voltage at a terminal of an opened phase conductor,
calculate an inductive voltage and a capacitive coupling voltage according to the measured currents and the measured voltages respectively,
compare the capacitive coupling voltage with a multiplication result being the inductive voltage multiplied by a factor, in which the multiplication result is a self-adjusted threshold based on a real-time load condition of the transmission line,
determines a larger value between the capacitive coupling voltage and the multiplication result based on the comparison,
identify a fault type based on the larger value between the capacitive coupling voltage and the multiplication result, and
close the circuit breaker in response to identifying the fault type as transient.

6 more elements

Dependencies are inferred from the claim text.

Voltage based method for fault identification in a transmission line apparatus thereof

Life of this patent

Voltage based method for fault identification in a transmission line apparatus thereof

Life of this patent

Abstract

Claims16