A METHOD OF DISCRIMINATING BETWEEN AN INTERNAL ARC AND A CIRCUIT-BREAKING ARC IN A MEDIUM OR HIGH VOLTAGE CIRCUIT-BREAKER

摘要

THE METHOD RELATES TO DISCRIMINATING BETWEEN AN INTERNAL ARC AND A CIRCUIT-BREAKING ARC ESTABLISHED IN THE ENCLOSURE OF A CIRCUIT BREAKER IN A BAY OF A MEDIUM OR HIGH VOLATGE METAL-CLAD SUBSTATION.THE APPEARANCE OF AN INTERNAL ARC IS DETECTED BY A PROTECTION SYSTEM WHICH RESPONDS BY TRANSMITTING A DISENGAGEMENT ORDER (15) TO THE CIRCUIT BREAKER, THEREBY CAUSING A CIRCUIT-BREAKING ARC TO APPEAR.THE METHPD CONSISTS IN:.CONTINUOUSLY MEASURING THE PRESSURE OF THE DIELECTRIC GAS INSIDE THE ENCLOSURE OF THE CIRCUIT BREAKER;. RECORDING SAID PRESSURE MEASUREMENTS SO THAT AFTER THE INSTANT AT WHICH THE DISENGAGEMENT ORDER (15) IS TRANSMITTED ,IT IS POSSIBLE TO RECOVER A FIRST PRESSURE VALUE MEASURED BEFORE SAID INSTANT;AND. COMPARING SAID FIRST PRESSURE VALUE WITH A SECOND PRESSURE VALUE MEASURED AFTER SAID INSTANT IN ORDER TO IDENTIFY WHETHER THE INTERNAL ARC WAS STRCUK IN SAID CIRCUIT BREAKER ENCLOSURE.(FIG 1)