KACO Powador XP500-XP550-HV TL User Manual
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3. The transformer must be designed for voltages on its low‑voltage windings that can exhibit a
voltage gradient dV/dt of up to 500V/µs reference to the ground. The line‑to‑line voltages must be
sinusoidal.
4. A shield winding that is grounded to the tank is necessary between the low‑voltage windings and
the high voltage windings. This shield plate must be designed to protect against the heat due to
eddy current by the flux of both the low voltage winding and the high voltage winding. This serves
as an additional dV/dt filter.
5. In ambient temperatures off up to 50 °C the transformer must have a current load capability of
110 %.
Further information can be found in the following documents:
‒ KACO central inverter data sheet
‒ Power derating of KACO central inverter
6. During thermal rating, the load curve and the ambient conditions at the respective installation site
should be taken into account.
7. KACO new energy recommends to use a transformer with a tap changer on the high‑voltage side
that enables an alignment to the voltage level of the medium‑voltage grid. Our recommendation
is 5 taps with 2.5% resolution.
8. The country-specific grid frequency should be taken into consideration.
9. The country specific standards valid should be taken into consideration.