Unipower Sageon Micro Power Module - Surge Protection Requirements; Figure 3.8 Surge Protection

Commissioning Sageon Micro Power Module Manual
PM990-4207-00, Rev. 6
3-7
3.3.5 Surge protection requirements
The rectifiers are internally protected for surges up to 6kV/3kA. For higher levels of protection, particularly for
sites with high incidence of lightning or switching surges, additional surge protection is required on the AC feed to
the Power shelf. Typically surge arrestors with a 10kA-40kA rating are required with the highest level of protection
being provided when arrestors are connected between phase-neutral (x3 phases) and between phase/neutral-earth (x
3 phases).
Other arrangements (for 3-phase “Y”) with similar levels of protection are also possible as shown below. The
voltage rating of the arrestor should be selected based on the maximum AC voltage likely to appear on the line. The
arrestor should limit the voltage to <1200V – 1400V at the rated maximum pulse current.
Figure 3.8 Surge Protection