Development of Single Break 420kV GCB

概要

論文の詳細を見る
420 kV-63 kA single break gas circuit breaker (GCB) has been developed(1). The authors show the steps to develop new interrupting chamber and circuit breaker by using various techniques. At first two interrupting chamber models are considered and investigated conducting electric field calculation and pressure measurement at the top of fixed arc contact, and capacitive current switching test is conducted especially with short arcing times. According to the test results, basic dimensions of interrupting chamber for development is determined. Pre-series CBs are manufactured, then it is confirmed that the breaker can produce the pressure rise in puffer cylinder (ΔP) as the predicted value by calculation and can interrupt short line fault (SLF) current. The driving energy is confirmed to be sufficient by conducting asymmetrical 100% breaker terminal fault (T100a) current interruption tests. All the type tests according to IEC are successfully conducted at the international neutral test station for the breakers for commercial use reflected the above results. The GIS layout with the above mentioned single break GCB can reduce the installation area in half comparing the case with the existing two break GCB.
2003-04-01