US 2012/0056637 A1 · APPARATUS AND METHOD FOR QUICKLY DETERMINING FAULT IN ELECTRIC POWER SYSTEM

Abstract

An apparatus for quickly determining a fault in an electric power system includes a current transformer, a current determination unit and a fault determination unit. The current transformer detects current supplied to the electric power system and outputs a current detection voltage. The current determination unit respectively compares the current detection voltage, the first-order differential voltage of the current detection voltage and the second-order differential voltage of the current detection voltage with predetermined first, second and third reference voltages. The fault determination unit determines whether a fault occurs based on the compared result of the current determination unit and generates a trip signal when it is determined that the fault has occurred.

Claims15

Dependent claims

An apparatus for quickly determining a fault in an electric power system, the apparatus comprising:

a current transformer configured to detect current supplied to the electric power system and output a current detection voltage;
a current determination unit configured to respectively compare the current detection voltage, a first-order differential voltage of the current detection voltage and a second-order differential voltage of the current detection voltage with predetermined first, second and third reference voltages;
and
a fault determination unit configured to determine whether a fault occurs based on the compared result of the current determination unit and generate a trip signal when it is determined that the fault has occurred.

1 more element

A method for quickly determining a fault in an electric power system, the method comprising the steps of:

(a) receiving a current detection voltage inputted based on current supplied to the electric power system;
(b) receiving an optical signal of an optical sensor provided to a portion at which light is generated in occurrence of an arc fault, and generating an optical detection voltage from the optical signal;
(c) generating a first-order differential voltage by performing a differentiation of the current detection voltage, and generating a second-order differential voltage by performing a differentiation of the first-order differential voltage;
(d) respectively comparing the current detection voltage, the first-order differential voltage, the second-order differential voltage and the optical detection voltage with predetermined first, second, third and fourth reference voltages;
and
(e) determining whether a fault occurs based on the compared result of the step (d), and generating a trip signal when it is determined that the fault has occurred.

3 more elements

Dependencies are inferred from the claim text.

Apparatus and method for quickly determining fault in electric power system

Life of this patent

Apparatus and method for quickly determining fault in electric power system

Life of this patent

Abstract

Claims15