TESTING OF SHORT-CIRCUITED INTERRUPTION IN RESISTANCE INTERRUPTION BUFFER TYPE GAS BREAKER

摘要

PURPOSE:To achieve a testing of short-circuited interruption effective for the verification of utility performance of a resistance interruption buffer type gas breaker by supplying current from a medium voltage transformer in the interruption of a low voltage transformer connected to a short-circuit generator. CONSTITUTION:The parting of pole is performed in an auxiliary breaker 7 on the secondary side of a low voltage transformer 4 connected to a short-circuit generator 1 synchronizing a main contact 13 of a sample resistance interruption buffer type gas breaker 8 to interrupt current flowing from the transformer 4 whose impedance is the smallest at the zero point of current. At the same time, a specified current flow to a resistance contact 11 through a resistance 12 from a mediumvoltage transformer 5 connected to the generator 11 while a high voltage is applied to a tank 14 of the breaker 8 from a high voltage transformer 6. Thereafter, with the parting of pole, the contact 11 is cut off at the zero point of current. Since the contact 11 is cut off after the interruption of the rated current at the contact 13, the pole parting property can be tested in ample equivalence to the actual operation while an insulation testing is allowed between the contacts 11 and 13 and in the tank 14 or the like thereby affording a testing of short-circuited interruption effective for the varification of utility performance.