Application Of The X-Ray Regulations - ABB VD4 Instruction Manual

8 Application of the X-ray regulations

One of the physical properties of vacuum insulations is the
possibility of X-ray emissions when the contact gap is open.
The specified type test performed by the Physikalisch-
Technische Bundesanstalt (PTB) in Brunswick demonstrates
that the local dosage output of 1Sv/h at a distance of 10 cm
from the touchable surface is not exceeded.
The results are as follows:
The use of the vacuum interrupters at rated voltage is
■
completely safe.
The application of the rated power frequency withstand
■
voltage specified for the switching devices by VDE 0670
and IEC 62271-100: 2001 is also safe.
Higher voltages than the rated power frequency withstand
■
voltage or DC test voltage specified in DIN VDE or IEC
standards must not be applied!
Fulfilment of the above requirement with the vacuum
■
interrupter in the open position is dependent on maintenance
of the specified distance between the contacts (which is
automatically ensured with correct mechanism function and
force transmission).
VD4 Vacuum Circuit-breaker | Application of the X-ray regulations 31