Patent ID: 6448780
Filing Date: 2002-09-10
Classification: G01R,H02H

Abstract:
A method of determining a resistance of an impedance of a conductive loop, the conductive loop being formed by a fault on a monitored section of an electric power supply system through which an alternating current flows, comprising the steps of:sampling instantaneous current values and instantaneous voltage values on the conductive loop over a half of a period of the alternating current; multiplying the instantaneous current values and the instantaneous voltage values together to determine instantaneous power values; integrating the instantaneous power values to form a proportional power value, the proportional power value being proportional to an effective power on the conductive loop; squaring the instantaneous current values and integrating the squared instantaneous current values to form an integral current value; and determining the resistance of the impedance of the conductive loop by forming a quotient of the proportional power value and the integral current value.