Permissible X - ray radiation emitted by vacuum - interrupters / - devices at rated operating conditions

摘要

In the medium voltage range, the vacuum interruption (VI) principle and vacuum devices (VD) are well established. Today, vacuum devices are available in the medium voltage range up to 52 kV rated voltage, as well as vacuum circuit breakers up to 80 kA short circuit current interruption ability. Besides the excellent interrupting performance, the vacuum interrupters and vacuum devices have to withstand at normal service condition and between the open contact system, while rated voltages and the corresponding test voltages applied according to the national and international standards. These are the power frequency voltages UPF and the lightening impulse voltages (Basic Insulation Level, (BIL)).