420kV 4000A 50kA L-T GCB Introduction structure diagram Main parameters: Circuit Breaker (CB) Type form OFPI-420-50L-FAR Rated voltage 420 kV Rated frequency 50 Hz Rated current 4000 A First-pole-to-clear factor 1.3 Rated short-circuit breaking current(4s) 50 kA Breaking time < 60ms Rated short-circuit making current 135 kA Rated short-time withstand current 50 kA Rated peak withstand current 135 kA Making capacity in short-line fault conditions (L75/L90) 37.5 / 45 kA Rated out-of-phase breaking current 12.5 kA Line charging breaking current 400 A Cable charging breaking current 400 A Power frequency withstand voltage 520 / 610 kV Lightning impulse withstand voltage 1425 / 1425+240 kV Rated SF6 gas pressure 0.6 Mpa.G Operating type Spring 420kV GCB structure diagram BACK ↑TOP
