... used in indoor 3.6, 7.2, 12, 24 and 40.5 kV, frequency for 50 Hz ac indoor hv ... , reflect high pressure condition, it may be charged loop and realizes the closure, prevent go charged interval, still can ... used in indoor 3.6, 7.2, 12, 24 and 40.5 kV, frequency for 50 Hz ac indoor hv ... , reflect high pressure condition, it may be charged loop and realizes the closure, prevent go charged interval, still can ...